CN1303323A - Method of winding strips - Google Patents

Abstract

A method of winding strips wherein in order to prevent a preceding strip from lingering at the outlet side of winding pinch rolls and prevent the front end of a following material from lingering at the inlet side of the winding pinch rolls, a strip fed out of a rolling mill is cut to a predetermined length by strip shears (102) and the cut strip is wound on the mandrel (107) of a winding device (104) via winding pinch rolls (105) disposed at the outlet side of the strip shears (102), the peripheral speed of the winding pinch rolls (105) after the tailing end of the strip to be wound on the mandrel (107) via the winding pinch rolls (105) has been cut by the strip shears (102) being higher than the speed at which the following material is transferred immediately after the cutting and lower than the winding speed at which the strip is wound on the mandrel (107).

Description

Strip coiling method

technical field

The present invention relates to cutting the steel strip sent out from a hot rolling mill into a predetermined length by a strip shearing machine, and the coil of the cut strip by a coiling device through a pinch roll for coiling arranged on the exit side of the strip shearing machine. A strip coiling method in which coils are coiled.

Background technique

Fig. 16 shows an overall schematic diagram of a general continuous hot rolling line. Conventionally, when a strip cut into a predetermined length by a strip shear is alternately coiled by a preceding material coiling device and a subsequent material coiling device, switching of the coiling device is performed as follows. For example, when switching from the preceding material coiler a to the succeeding material coiler b, the strip d sent out from the finishing mill c is cut by the strip shearing machine arranged on the downstream side of the finishing mill c. e is cut into a specified length and divided into the preceding strip _d1 and the following strip _d2 , the preceding strip _d1 and the following strip _d2 are respectively used by the preceding material coiling device a and the subsequent material coiling device b Do coiling.

While the preceding strip _d1 is being coiled by the preceding material coiling device a, the lower pinch roll g of the pinch roll f for coiling arranged on the exit side of the strip shearing machine e is moved to the upstream side so that Change the offset angle of the pinch roll f for coiling, switch the conveying direction of the strip from the preceding coiler a to the succeeding coiler b in advance, and leave the coiling nip when the preceding strip d ₁ Immediately after sending the roll f, the succeeding steel strip _d2 is guided to the succeeding material coiler b, and the succeeding strip steel _d2 is coiled by the succeeding material coiler b. At this time, a triangular gate (gate) j prevents the trailing strip d ₂ from passing through the side of the preceding coiling device a.

In recent years, the coiling equipment for continuous hot rolling has adopted a carrousel type coiling equipment.

Fig. 20 schematically shows an example of a continuous hot rolling line in which a rotary car type coiling facility is arranged.

The rotary car type coiling equipment is provided with the first and the second reel, and the first and the second reel 1, 2 are separated from each other in the circumferential direction on the rotating track 3 and are rotatably arranged so that they can be rotated in one reel. When the roll is at the start position of winding, the other roll is at the end position of winding. For example, when the first reel 1 is positioned at the coiling start position, after a predetermined amount of the preceding strip S1 sent out from the finishing mill 4 is coiled with the first reel ₁ , the preceding strip _S1 is coiled while the Rotate the first reel 1 to the end position of coiling, in this state, cut off the tail end of the leading strip _S1 with the strip shear 5, and move backward with the second reel 2 at the coiling start position The leading end of the strip S ₂ is coiled. In addition, after the coiling of the strip steel _S1 at the coiling end position is completed, the coil of the preceding strip steel _S1 that has been coiled is drawn out from the reel 1, and the reel 1 becomes in a standby state until the coil of the preceding strip steel S1 is unwound. The front end of the strip behind S ₂ is coiled.

Above and below the upstream pass line _P1 of the reel (the first reel 1 in the figure) facing the coiling start position, there are provided upstream side threading guides 6 to 13 for guiding the leading end of the strip S The upstream side reel is branched from the upstream side pass line _P1 to the downstream side pass line _P2 toward the coiling end position (the second reel 2 in the figure) above and below, and downstream side threading is provided. The guide plates 13 to 15 and the guide roller 20 guide the steel strip S wound on the reel at the winding end position. The threading guide plate 13 is arranged at a position where the downstream pass line _P2 diverges from the upstream pass line _P1 , and has both an upper guide plate on the upstream pass line _P1 and an upper guide plate on the downstream pass line P. ₂ on the lower guide.

In Fig. 20, symbol 16 is the pinch roll that is arranged between the finishing mill 4 and the strip shearer 5 on the rolling line _P1 , and 17 is arranged on the strip shearing machine ₅ on the rolling line P1. The pinch roller for winding on the exit side, 18 is the upstream side outer winding roller, which is arranged in a movable form to approach or leave the outer peripheral surface side of the winding start position of the reel, and 19 is the downstream side outer winding roller, which Configured in a movable form, it can approach or leave the outer peripheral surface side of the winding end position reel. When the first and second reels 1 and 2 rotate on the rotating track 3, the outer winding rollers on the upstream side and downstream side 18, 19 and the upper guide plate 14 of the downstream side threading guide plate move and leave the rotary track 3 that allows this rotation.

However, the existing strip coiling method on the above-mentioned general hot rolling line is prone to the following problems, that is, when the strip is cut by the strip shear e, the force applied to the strip by the finishing mill c and the preceding coiler a The tension of the steel strip is cancelled. As shown in Figure 17, the tail end of the leading steel strip will pile up on the exit side of the pinch roll f for coiling. In the worst case, the tail end of the leading steel strip hangs on the triangular gate In addition, the following problem also arises, that is, after the tail end of the leading strip _S1 leaves the coiling pinch roll f, the circumferential speed of the coiling pinch roll f is temporarily faster than that of the trailing strip. The conveying speed of _S2 is slow, and the front end of the trailing strip S2 is piled up on the entrance side of the pinch roll f for coiling.

In the hot rolling line equipped with rotary car type coiling equipment, the existing strip coiling method also has the following problem: the preceding strip is coiled with the coil (second coil 2) at the end position of coiling. When the strip steel is cut by the strip shear machine 5 in the process of _S1 , the tension originally applied by the finishing mill 4 and the downstream reel is loosened, as shown in Figure 21, the leading strip _S1 is configured in the strip shear The exit side of the pinch roller ₁₇ for coiling on the exit side _of the cutting machine produces _a pile of steel phenomenon. The front end of the downstream side guide plate 13 on the road position damages the steel plate, and also causes the following problem, that is, after the tail end of the preceding strip _S1 leaves the pinch roll 17 for coiling, the pinch roll 17 for coiling The peripheral speed is temporarily slower than the conveying speed of the trailing strip _S2 , and the front end of the trailing strip _S2 is piled up on the entrance side of the coiling pinch roll 17.

The present invention is developed in order to solve the above-mentioned unfavorable phenomenon, and its purpose is to provide a strip steel coiling method, which can prevent the The steel strip is piled up on the exit side of the pinch roll for coiling arranged on the exit side of the strip shearing machine, and it is also possible to prevent the front end of the trailing strip from forming on the entrance side of the pinch roll for coiling. Pile of steel phenomenon.

disclosure of invention

In order to achieve the above object, the strip steel coiling method of the present invention is to cut the strip steel sent out from the finishing mill into a predetermined length by a strip steel shearer, and pass the pinch roll for coiling arranged on the exit side of the above-mentioned strip steel shearer. , a strip coiling method in which the cut strip is coiled with a reel of a coiling device,

It is characterized in that after cutting the tail end of the strip wound on the above-mentioned reel by the above-mentioned pinch roll for coiling by the above-mentioned strip steel shearing machine, the peripheral speed of the pinch roll for coiling is made to be higher than that of the above-mentioned The conveying speed of the cut off material is fast and slower than the coiling speed of the above-mentioned steel strip by the above-mentioned reel.

In the present invention, since the cut strip acts on the downstream side between the strip shear and the pinch roll for coiling, a tension towards the downstream side also acts between the pinch roll for coiling and the drum. The pulling force on the downstream side can prevent the preceding steel strip from forming a pile of steel on the exit side of the pinch roll for coiling, and also because the peripheral speed of the pinch roll for coiling is faster than that of the subsequent material immediately after the above-mentioned cutting. The conveying speed is fast, so it is possible to prevent the front end of the subsequent material from being piled up on the entrance side of the pinch roll for coiling.

In this case, the above-mentioned reel is a reel of a rotary car type coiling equipment, and the tail end of the strip coiled on the reel by the above-mentioned pinch roll for coiling is cut by the above-mentioned strip shearing machine. Then, the relationship between the set coiling speed V _m of the above-mentioned reel, the target speed V _p of the pinch roll for coiling when performing the cutting, and the plate speed V _s of the subsequent material after the cutting is set as V _m > V _p > V _s , it can prevent the leading strip from hanging on the front end of the threading guide plate, which is located between the rolling line of the coil towards the coiling start position and the coil towards the coiling end position. On the branch position of the rolling line.

In addition, the strip cut into a predetermined length by the strip shear passes through the first pinch roll for coiling arranged on the exit side of the strip shear, and is coiled by the drum of the upstream coiler and the downstream coil. In the coiling method in which the reels of the device are coiled alternately,

After the tail end of the strip coiled on the downstream side reel is cut by the above-mentioned strip shearing machine through the pinch roll for the second coiling arranged on the downstream side reel inlet side, the above-mentioned second coiling The target speed V _p1 of the pinch roller, the target speed V _p2 of the first pinch roll for winding, the target plate speed Vs of the subsequent material immediately after cutting, and the set winding speed of the downstream side roll By setting the relationship of Vm to Vm> _Vp1 > _Vp2 >Vs, it is possible to prevent the strip from being damaged due to the tail end of the preceding strip being caught on the triangular gate.

In this case, after the lower pinch roll of the above-mentioned first pinch roll for coiling is deviated, until it is cut by the above-mentioned strip shear, passes through the pinch roll for coiling of the second coil and is coiled on the downstream side. During the period up to the trailing end of the strip on the reel, when the speed of the first lower pinch roll is made slower than the target plate speed Vs of the subsequent material, the speed of the first pinch roll for coiling is used. The upper pinch roller pushes the steel strip until the actual value of the torque of the first lower pinch roller reaches a predetermined set value, and the pushing force at this time is set as the above-mentioned upper pinch roller when the above-mentioned offset is performed. The set pushing force of the strip is such that the tail end of the strip wound on the downstream reel can be well held by the pinch rollers for the first coiling.

In addition, before the strip cut by the above-mentioned strip shear passes through the pinch roll for the coiler arranged on the outlet side of the strip shear, and is continuously coiled by the above-mentioned reel, the coiling The pressure of the pinch roller is set to be greater than the P value, and the P value is calculated by P=2F(Δu/Δx)+4(M _B /ΔX){(R _a /R _L )+(l _b /R _U )} It is determined that in this way, the pressure of the upper pinch roller can be set to the most appropriate value, so the tail end of the thin strip can be prevented from breaking or the introduction of the thick strip into the coiler can be prevented.

In this case, after setting the above-mentioned pushing force, the roll gap of the above-mentioned pinch roll for coiling can be maintained from the tailing of the leading strip to the biting of the trailing strip, so that the trailing strip can be prevented from being bitten. When pinch rolls are used for winding, there are phenomena such as poor bite.

Before the coiling of the strip with the above-mentioned reel is completed, the control of the coiling of the strip through the reel is switched from torque control to speed control, and then the pinch roller is pressed against the coiled steel strip so that The rotation of the above-mentioned reel is stopped, which eliminates the deceleration of the coil caused by the contact of the pinch roller. After the completion, when the rotation of the coil is stopped, since the pinch roller has a braking force, the rotation of the coil can be stopped in a short time.

Before the coiling of the strip steel with the above-mentioned reel is completed, the strip steel torque control of the reel is carried out to increase the tension of the strip steel, and then the pinch roller is pressed on the coiled steel strip to make the above-mentioned reel Stopping the rotation eliminates the deceleration of the coil caused by the contact of the pinch roller, and avoids the occurrence of unwinding of the outer coil or tower shape of the coil. In addition, when the rotation of the coil is stopped after the coiling of the strip is completed, since the pinch roller has a braking force, the rotation of the coil can be stopped in a short time.

In addition, when the front end of the above-mentioned subsequent material bites into the above-mentioned coiling pinch roll arranged on the exit side of the strip shear after the strip is cut by the above-mentioned strip shear, the coiling pinch roll The peripheral speed of the coil is faster than the conveying speed of the above-mentioned subsequent material. By setting the torque limit on the deceleration side on the driving device of the above-mentioned pinch roller for coiling, it can In the case of the case, prevent the steel stacking phenomenon on the inlet side of the pinch roll for coiling in the subsequent material.

A brief description of the drawings

Fig. 1 is an explanatory diagram for explaining a strip coiling method according to Embodiment 1 of the present invention.

Fig. 2 is an explanatory diagram illustrating an example of an operation pattern (speed pattern) of each part when cutting and coiling a steel strip.

Fig. 3 is an explanatory diagram for explaining the states of the leading strip and the trailing strip from the time of strip cutting to the state after cutting.

Fig. 4 is an explanatory diagram for explaining a strip coiling method according to Embodiment 2 of the present invention.

5 is a diagram for explaining a strip coiling method according to Embodiment 3 of the present invention, and is a schematic perspective view of a driving mechanism of a pinch roll for coiling on the outlet side of a strip shear.

Fig. 6 is a graph showing temporal changes in the rotational speed and load torque of the pinch roll for coiling at the exit side of the strip shear when the torque limit on the deceleration side is set.

Fig. 7 is a graph showing changes over time in the rotation speed and load torque of the pinch roll for coiling at the outlet side of the strip shear when no torque limit on the deceleration side is set.

Fig. 8 is a diagram for explaining Embodiment 4 of the present invention, and is a diagram showing a mechanical model for winding a coil;

Fig. 9 is a graph showing the measurement results of the speed and torque of the spool at the end of winding.

Fig. 10 is a graph showing the measurement results of the speed and torque of the spool at the end of winding.

Fig. 11 is a diagram for explaining Example 5 of the present invention, and is a graph showing the relationship between the pressure of the strip and the pushing amount when the upper pinch roll of the pinch roll for coiling is used.

Fig. 12 is a timing chart of the pressure of the upper pinch roll of the pinch roll for coiling on the strip and the command of oiling the hydraulic cylinder.

Fig. 13 is a timing chart of the pressure of the upper pinch roll of the pinch roll for coiling on the strip and the command of oiling the hydraulic cylinder.

Fig. 14 is a side view of a pinch roller for winding after shifting.

Fig. 15 is a side view when the strip is pressed down by the upper pinch roll of the pinch roll for coiling.

Fig. 16 is an overall schematic diagram of a general continuous hot rolling line.

Fig. 17 is an explanatory view for explaining the phenomenon of stacking at the tail end of the strip on the exit side of the pinch roll for coiling.

Fig. 18 is an explanatory view for explaining a problem in the case where the upper pinch roll of the coiling pinch roll exerts a small pressure on the strip.

Fig. 19 is an explanatory view for explaining the phenomenon of stacking at the front end of the strip running behind the inlet side of the pinch roll for coiling.

Fig. 20 is a schematic diagram showing a rotary car type coiling device.

Fig. 21 is an explanatory view for explaining the phenomenon of stacking at the tail end of the strip on the exit side of the pinch roll for coiling.

The best form for carrying out the invention

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, Embodiment 1 of the present invention, that is, a strip coiling method in a general hot rolling line will be described with reference to FIGS. 1 to 3 .

Fig. 1 is a diagram schematically showing the downstream side of the strip shearing machine of the continuous hot rolling line. In this embodiment, the following situation is taken as an example. The shearing machine 102 cuts to a predetermined length, and the preceding strip _S1 passes through the pinch roll (the pinch roll for the second coiling) 103 for downstream side coiling, and is coiled with the reel 107 of the downstream side coiling device 104, Simultaneously, the trailing strip _S2 passes through the upstream coiling pinch roll (the first coiling pinch roll) 105 disposed on the outlet side of the strip shearing machine 102, and the drum 107 of the upstream coiling device 101. Do coiling.

Both the downstream side coiler 104 and the upstream side coiler 101 are used as means for tensioning the steel strip wound on the reel 107 with a prescribed coiling tension, and each includes the following parts: the torque of the motor 108 is detected. Detector 109, this motor is used to drive reel 107 revolution; Torque control device 110, this device carries out feedback control to motor 108, so that the detection torque value obtained with torque detector 109 is consistent with the target torque value, Keep the strip steel tension at a certain value; the auxiliary generator (PLG) 111 used to detect the rotation state of the motor 108; the speed control device 112, which is used for feedback control of the motor 108, so that the speed obtained by the auxiliary generator 111 The detection value matches the target speed.

The pinch roller 103 for winding on the downstream side includes the following parts: a torque detector 114 for detecting the torque of the motor 113 of the lower pinch roller 103a; an auxiliary generator (PLG) 115 for detecting the rotation state of the motor 113; A speed control device 116, which is used for feedback control of the motor 113, so that the speed detection value obtained by the auxiliary generator 115 is consistent with the target speed V _p1 .

In addition, the upstream winding pinch roller 105 also includes the following parts: a torque detector 118 for detecting the torque of the motor 117 of the lower pinch roller 105a; an auxiliary generator for detecting the rotation state of the motor 117 ( PLG) 119; a speed control device 120, which is used for feedback control of the motor 117, so that the speed detection value obtained by the auxiliary generator 119 is consistent with the target speed V _p2 . When switching from the downstream side coiler 104 to the upstream side coiler 101, the lower pinch roll 105a can move upstream along the pass line when changing the offset angle, so that the upper pinch roll 105b can press the strip , the strip can be pressed down by the hydraulic cylinder 121. A pressure detector 122 is installed on the upper pinch roller 105b for detecting the pressure applied to the upper pinch roller 105b.

In order to make the detection pressure obtained by the pressure detector 122 consistent with the set pressure previously set by the compensation pressure setter 124, the pressure exerted on the upper pinch roller 105b by the hydraulic cylinder 121 is determined as follows: The pressure control device 125 feedback-controls a servo valve 127 for switching the oil supplied from the hydraulic pump 126 to the hydraulic cylinder 121 . Air can also be used to control the pressure of the pinch rollers.

Next, the situation of switching from the downstream side coiler 104 to the upstream side coiler 101 will be described. First, during the coiling of the preceding strip _S1 with the reel 107 of the downstream side coiler 104, the hydraulic cylinder ( not shown) etc. to move the lower pinch roll 105a of the pinch roll 105 for upstream coiling to the upstream side along the pass line to change the offset angle of the pinch roll 105 for upstream coiling and to The feeding direction of the strip is switched from the downstream side coiler 104 to the upstream side coiler 101, and the trailing strip _S2 can be guided upstream immediately after the preceding strip _S1 leaves the upstream coiling pinch roller 105 Side winder 101 side. In FIG. 1 , reference numeral 128 is a triangular gate for preventing the leading end of the trailing strip _S2 from entering the downstream coiler 104 side.

Under the state that preceding strip steel S ₁ is coiled on the reel 107 of downstream side coiler 104, when cutting strip steel with strip steel shearing machine 102, the present invention, when carrying out above-mentioned cutting, through host computer (not shown in figure) ) The set coiling speed Vm of the preceding strip _S1 obtained by the speed control device 112 of the coiling device 104, the target speed V p2 of the speed control device 120 on the side of the pinch roll 105 for upstream coiling, the target speed V _p2 of the downstream coil The target speed V _p1 of the speed control device 116 on the side of the pinch roller 103 and the conveying speed Vs of the trailing strip _S2 immediately after cutting (=the conveying speed of the strip just before cutting) are set so that Vm>V _p1 >V _p2 >Vs.

Detailed explanation below

Now, in the state where the preceding strip _S1 is coiled on the reel 107 of the downstream side coiler 104, when the strip cutting is completed by the strip cutter 102, the cutting completion signal of the situation where the cutting is completed is given by The strip shearing machine 102 or the host computer notifies the speed control device 112 of the downstream coiling device 104, the speed control device 116 of the pinch roll 103 for the downstream coiling, and the speed control of the pinch roll 105 for the upstream coiling respectively. device 120.

The signal of the completion of the cutting is notified at time _t0 , and corresponding to this time _t0 , the winding drum 107 of the downstream winding device 104 is switched from the tension control performed by the torque control device to the tension control performed by the speed control device 112. speed control. Simultaneously, corresponding to this time t ₀ , the speed control device 112 starts to accelerate the coiling speed of the steel strip, and as shown in the curve I of Fig. 2, the speed of its acceleration is the final speed V _m after the acceleration of X starts to be ( 1) Type of speed control.

V _m =Vs×A...(1)

In the formula, Vs is the strip conveying speed before cutting, and A is the lead rate (coefficient for determining the final speed).

In addition, the states of the preceding strip _S1 and the following strip _S2 at time _t0 are shown in FIG. 3(A).

During the delay time _T1 from the acceleration start time _t0 to time _t1 , the speed of the downstream winding pinch roller 103 is maintained at a cut-off speed by the speed control device 116 of the downstream winding pinch roller 103. The previous strip speed Vs. However, as soon as time _t1 is reached, the speed control device 116 starts to increase the speed of the downstream side take-up pinch roller 103, and as shown in the curve II of FIG. V _p1 is the speed control of formula (2). The above-mentioned delay time _T1 is counted by a timer of the speed control device 116 or a host computer.

_Vp1 =Vs×B...(2)

In the formula, B is the lead rate, and the relationship between the lead rates A and B is A>B.

During the delay time _T2 from the acceleration start time _t0 to time _t2 , the speed of the pinch roller 105 for upstream winding is maintained at a cut-off speed by the speed control device 120 of the pinch roller 105 for upstream winding. The previous strip speed Vs. However, as soon as the time _t2 is reached, the speed control device 120 starts to increase the speed of the pinch roller 105 for winding on the upstream side, and as shown in the curve III of FIG. V _p2 is the speed control of formula (3). The delay time T2 is measured by a timer of the speed controller or a host computer (not shown), and the relationship between the delay times T1 and T2 is T1<T2.

_Vp2 =Vs×C...(3)

In the formula, C is the lead rate, and the relationship between the lead rate B and C is B>C.

Then, when the time _t3 comes, as shown in FIG. 3(B), the tail end of the leading strip _S1 and the front end of the trailing strip _S2 are positioned at the upstream coiling pinch roll 105 and the strip shear respectively. Between the cutting machines 102, the trailing end of the preceding strip _S1 and the leading end of the following strip _S2 are completely separated.

As shown in FIG. 2 , when time _t4 is reached, the winding speed of the reel 107 of the downstream side winding device 104 reaches the final speed Vm, and when time _t5 is reached, the speed of the downstream side winding pinch roller 103 reaches the final speed Vm. The speed V _p1 reaches the final speed V _p2 at time _t6 .

At time _t7 , as shown in FIG. 3(C), the trailing end of the leading strip _S1 is located between the pinch roll 103 for downstream coiling and the pinch roll 105 for upstream coiling, and the trailing strip S1 The tip of the steel _S2 is in a state of reaching the upstream winding pinch roller 105 .

The speed ratio X of the final speed Vm to the final speed V _p1 and the speed ratio Y of the final speed V _p1 to the final speed V _p2 are expressed by the following equations.

x=(A·V _m )/(B·V _p1 )=A/B…(5)

Y=(B·V _D1 )/(C·V _D2 )=B/C...(6)

Therefore, for example, if the lead ratios A, B, and C are set to A=1.5, B=1.1, and C=1.05, then the speed ratios x, y are expressed in the following formula.

Speed ratio x=(1.5/1.1)=1.045...(7A)

Speed ratio y=(1.1/1.05)=1.048...(7B)

From the viewpoint of the coiling performance of the coiler 104 on the downstream side of the strip, it is better for the lead ratios A, B, and C to be large, but when the lead ratio is large, the deceleration energy during coiling is added to the strip. , Therefore, excessive tension is generated on the strip after finishing rolling, which reduces the width of the strip and causes problems in quality. Therefore, according to the thickness of the strip, the coilability is firstly determined empirically.

In addition, the speed ratio between the downstream side winding device 104 and the downstream side winding pinch roller 103 during the acceleration process is also preferably to ensure the above-mentioned speed ratio X, and the downstream side winding pinch roller 103 and the upstream side winding use pinch roller 103 and the upstream side winding. It is also preferable that the speed ratio of the pinch roller 105 during acceleration ensures the speed ratio Y mentioned above.

In order to ensure that the speed ratio between the downstream side winding device 104 and the downstream side winding pinch roller 103 during acceleration is the above-mentioned speed ratio, the following formula is established using the formula (5).

(Vs+X·T1)/Vs=A/B...(8)

In the formula, X is the acceleration speed of the downstream winding device 104, and T1 is the delay time shown in FIG. 2 .

By changing the (8) formula, the delay time T1 is as shown in the following formula, and the delay time can be set according to the following formula.

T1=(Vs/X)(A/B-1)...(9)

Similarly, in order to ensure the speed ratio between the downstream winding pinch roller 103 and the upstream winding pinch roller 105 at the above speed ratio Y during acceleration, the following equation holds.

T3=(Vs/Y)(B/C-1)...(10)

In the formula, Y is the acceleration speed of the pinch roller 103 for coiling, and _T3, as shown in FIG. time. Therefore, the delay time T ₂ shown in FIG. 2 can be set as T ₂ (T ₁ +T ₃ ).

In addition, the acceleration of the downstream side coiling device 104, the downstream side coiling pinch roll 103, and the upstream side coiling pinch roll 105 must reach the upstream side coiling pinch at the front end of the cut trailing strip _S2 . Feed roll 105 is done before. That is, the relationship among the times t ₄ , t ₅ , t ₆ , and t ₇ shown in FIG. 2 must satisfy the condition of the following formula.

t ₇ >t ₄ , t ₇ >t ₅ , t ₇ >t ₆ …(11)

An example of the above conditions will be specifically described below.

For example, assuming that the distance between the pinch roll 105 for coiling on the upstream side and the strip shear 102 is 10 (m), the speed Vs before the strip cutting (=the conveyance of the trailing strip _S2 immediately after cutting When the speed Vs) is 900 (mpm), the time for the cutting trailing strip _S2 to reach the upstream side coiling pinch roll 105 is 10 m/(900 mpm/60 sec)=0.67 (sec).

In addition, assuming that the lead ratio A is A=1.15, the final speed Vm of the spool 107 of the downstream winding device 104 is Vm=900×1.15=1035 (mpm). Since the speed is accelerated from 900 (mpm) to 1035 (mpm) within 0.67 (sec), the acceleration rate X is (1035-900)/0.67=201 (mpm/S).

By setting the speed in this way, on the cut strip _S1 , since V _p2 >Vs between the pinch rolls 105 for coiling in the strip shear 102, it passes through the pinch rolls 105 for coiling. There is a pulling force toward the downstream side, and since V _p1 > V _p2 between the pinch roller 105 for winding and the pinch roller 103 for winding, there is a pulling force toward the downstream side by the pinch roller 103 for winding. Tensile force is Vm>V _p1 between the pinch roller 103 for winding and the mandrel 107 of the downstream winding device 104 , so a pulling force toward the downstream side acts through the mandrel 107 .

Therefore, it is possible to prevent the exit side of the pinch roller 105 for winding, that is, between the winding device 104 and the pinch roller 103 for winding on the downstream side, and between the pinch roller 103 for winding on the downstream side and the pinch roller 103 for winding on the upstream side. The tail end of the leading strip _S1 between the pinch rollers 105 produces a pile of steel phenomenon, as a result, it can also prevent the tail end of the leading strip _S1 from being hung on the triangular gate 26 to cause the strip to be damaged. When the speed is set, that is, when V _p2 >Vs, the feeding speed of the pinch roller 105 for coiling is faster than the conveying speed of the trailing strip _S2 , and therefore, it is possible to prevent the front end of the trailing strip _S2 from being caught in the wind for coiling. The inlet side of the pinch roller 105 is stacked with steel.

In addition, when changing the offset angle of the pinch roll 105 for upstream coiling, if the pressure of the upper pinch roll 105b to press down the strip is small, the pinch roll 105 for upstream coiling cannot sufficiently pinch the steel strip for downstream coiling. The tail end of the strip steel coiled by the reel 107 of the side coiler 104, so the tail end of the strip steel cannot be fully pressed by the pinch roll 105 for upstream side coiling and slips, as shown in Figure 18, the downstream A stack of steel occurs between the side coiler 104 and the upstream side coiler 101 . Therefore, in this embodiment, the pressure that can reliably pinch the strip by the upstream side coiling pinch roll 105 is set, and the upstream side coiling pinch roll 105 securely clamps the steel strip before the above-mentioned cutting. Leading strip S ₁ .

Next, detailed description will be given.

As shown in FIG. 1 , when the pressure detector 122 of the pinch roll 105 for upstream coiling is disposed on the side of the upper pinch roll 105b, the preceding strip _S1 is wound on the drum of the downstream coiler 104. In the state above 107, when changing the offset angle of the pinch roller 105 for coiling on the upstream side, it is necessary to press down the preceding strip S ₁ from the rolling line according to the offset amount of the lower pinch roller 105a, and use the upper and lower pinch rollers to press down the preceding strip S1. The steel strip S ₁ is sandwiched between the feed rolls 105b and 105a. In the example shown in FIG. 1, the upper pinch roll 105b of the pinch roll 105 for coiling on the upstream side presses down the preceding strip S ₁ with the hydraulic cylinder 121, and the compensation pressure setter 124 is used to set the pressure at this time. pressure.

The compensation pressure setting device 124 is used to set the compensation pressure that the upper pinch roll 105b and the lower pinch roll 105a of the pinch roll 105 for coiling on the upstream side will surely clamp the preceding strip _S1 , and change the upstream coiling pressure. After taking the offset angle of the pinch roll 105, until an appropriate time during which the trailing end of the preceding strip _S1 is cut off by the strip shear 102, the speed control device 120 is controlled so that the speed reference ratio of the lower pinch roll 105a is The strip speed Vs of the preceding strip _S1 is slightly lower, and in this state, until the detected torque value T detected by the torque detector 118 reaches a predetermined set value T. The servo valve 126 is feedback-controlled by the pinch roll pressure control device 125 to continue pushing the strip S ₁ .

In the case where the speed reference of the lower pinch roll 105a is slightly lower than the plate speed Vs of the preceding strip _S1 , if the preceding strip _S1 cannot be pressed down with the required pressure, then the pressure is applied to the lower pinch roll 105a. The load is not too large, so the torque of the lower pinch roller 105a does not increase, and when the leading strip _S1 is pressed down with the required pressure, slippage occurs between the leading strip _S1 and the lower pinch roller 105 Increase the load (torque). Utilizing this point, the compensation set pressure (in this case, the force of pinching the preceding strip _S1 by the upper pinch roll 105b and the lower pinch roll 105a) Ps(N) is estimated.

That is, assuming that the speed difference between the preceding strip _S1 and the lower pinch roll 105a is ΔV (mpm), the coefficient of friction between the preceding strip _S1 and the lower pinch roll 105a that changes due to the speed difference ΔV is μ ₂ (ΔV) , the actual torque of the lower pinch roll 105a is T (N·m), and the radius of the lower pinch roll 105a is r (m), then the upper pinch roll 105b and the lower pinch roll 105a are used to clamp the preceding strip S The force Ps(N) of ₁ can be expressed by the following formula.

Ps=T/[r·μ ₂ (ΔV)]...(12)

Therefore, as long as the μ ₂ value at the predetermined speed difference ΔV is obtained in advance, and the actual torque T of the lower pinch roller is measured, the compensation set pressure Ps can be obtained from the formula (12).

In the pressure setting method performed by the compensation pressure setter 124, it is determined in advance that even if the above-mentioned strip shear 102 is used to cut, the tail end of the preceding strip _S1 will not be wrinkled and can be pinched for coiling on the upstream side. When the roller 105 clamps the above-mentioned compensation setting pressure _Ps1 of the steel strip _S1 , and the speed of the lower pinch roller 105a is set to be lower than the plate speed Vs of the steel strip _S1 by a predetermined speed ΔV before the above-mentioned cutting, the above-mentioned The torque value T ₀ of the lower pinch roller 105 a when the compensation setting pressure is Ps ₁ is preset in the compensation pressure setter 124 . Next, the compensating pressure setter 124 sends a signal to the speed control device 120 so that the speed of the lower pinch roller 105a is lower than the above-mentioned plate speed Vs by ΔV before the above-mentioned cutting, and then, while using the torque detector 118, The actual torque T of the lower pinch roll 105a is measured, and the signal is sent to the pinch roll pressure control device 125, so that the strip S ₁ is pressed down by the upper pinch roll 105b. This actual torque T is set to a value greater than T ₀ . Therefore, the strip _S1 can be securely pinched by the upstream side coiling pinch rolls 105 . In this state, the trailing end of the preceding strip _S1 is cut by the strip shear 102 .

Therefore, in the case of using the compensating pressure setter 124, since the pressure is set in consideration of the force actually acting on the preceding strip _S1 , the upper pinch roll of the pinch roll 105 for upstream coiling can be used. 105b and the lower pinch roller 105a securely clamp _the preceding strip _S1 to prevent slippage. There is a pile of steel phenomenon between them.

In addition, through the upper computer control Vm>V _p1 >V _p2 >VS, the compensation pressure setter 124 is used to press the preceding strip _S1 until the tail end of the preceding strip S1 is coiled at the downstream side of the coiling device 104. on the reel 107.

In this embodiment, the case of coiling the strip steel with the reel 107 of the downstream side coiler 104 has been described, but the occasion of coiling the strip steel with the coil 107 of the upstream side coiler 101 can also be applied. invention.

Next, with reference to FIG. 4 , Embodiment 2 of the present invention, that is, a strip coiling method on a hot rolling line equipped with rotary car type coiling equipment will be described. The basic configurations of the rotary car coiler and the continuous hot-rolling line are the same as those described in the conventional example (Fig. 20 and Fig. 21), and therefore the same reference numerals are used for the overlapping parts and descriptions are omitted.

Fig. 4 schematically shows the part on the downstream side of the strip shearing machine of the continuous hot rolling line. The cutting machine 5 is cut into a predetermined length, and the leading strip _S1 passes through the coiling pinch roller 17 arranged on the exit side of the strip shearing machine 5, and the coil at the coiling end position (the second coil 2 in the figure) While coiling is performed, the trailing strip _S2 passes through the pinch roll 17 for coiling and is coiled with the coil at the coiling start position (the first coil 1 in the figure).

On the second reel 2 located at the coiling end position, as a mechanism for tensioning the steel strip wound on the reel 2 with a prescribed coiling tension, the following parts are included: A torque detector 34, which drives the reel 2 to rotate; a torque control device 36 that keeps the tension of the strip steel constant, and this device performs feedback control to the motor 32, so that the detected torque value obtained by the torque detector 34 Consistent with the target torque value; Auxiliary generator (PLG) 38 for detecting the rotation state of the motor 32; Speed control device 40, which performs feedback control on the motor 32 so that the speed detection value obtained by the auxiliary generator 38 is consistent with The target speed is the same.

On the first reel 1 located at the coiling start position, as a mechanism for tensioning the strip wound on the reel 1 with a predetermined coiling tension, the following parts are also included: detecting the rotation of the driving reel 1 The torque detector 33 of the torque of the motor 31 used; Make the tension of steel strip keep constant torque control device 35, this device carries out feedback control to motor 31, so that the detection torque that torque detector 33 obtains The value is consistent with the target torque value; the auxiliary generator (PLG) 37 that detects the rotation state of the motor 31; the speed control device 39, which is used to perform feedback control on the motor 31 so that the speed obtained by the auxiliary generator 37 can be detected The value is consistent with the target speed.

The pinch roller 17 for winding is provided with an auxiliary generator (PLG) 42 and a speed control device 43, wherein the auxiliary generator is used to detect the rotation state of the motor 41 of the lower pinch roller 17a, and the speed control device is used to control the motor 41. Feedback control is performed so that the speed detection value obtained by the auxiliary generator 42 coincides with the target speed Vp. The upper pinch roll 17b of the coiling pinch roll 17 can press the steel strip through the hydraulic cylinder 44 for pushing the steel strip toward the lower pinch roll 17a side.

Next, the case of switching from the reel at the winding end position (the second reel 2 in the figure) to the reel at the winding start position (the first reel 1 in the figure) will be described. 2 While the reel 2 is coiling the preceding strip _S1 , the upper pinch roll 17b of the pinch roll 17 for coiling is pressed down by the hydraulic cylinder 44 so that the strip can be pinched by the pinch roll 17 for coiling. Steel S ₁ . In this state, the tail end of the strip _S1 is cut off with the strip shear 5, and in this embodiment, the speed control device 40 of the reel 2 after the cutting is set to The relationship between the set coiling speed Vm of the predetermined preceding strip _S1 , the target speed Vp of the speed control device 43 relative to the coiling pinch roll 17 at the time of cutting, and the extreme speed Vs of the preceding strip _S1 before cutting The relationship among them is set as Vm>Vp>Vs.

Speed setting is carried out in this way, because Vp>Vs between the strip steel shearing machine 5 and the pinch roll 17 for coiling, so the pinch roll 17 for coiling acts on the strip _S1 after cutting to the downstream side. The tightening force is Vm>Vp between the pinch roll 17 for coiling and the reel 2, so the force of the reel 2 stretching toward the downstream side acts on the strip after cutting.

Therefore, on the exit side of the pinch roll 17 for coiling, the phenomenon of stacking of the preceding strip _S1 can be prevented, and as a result, the preceding strip _S1 can be prevented from being caught between the upstream rolling line _P1 and the downstream rolling line The front end of the downstream side guide plate 13 at the line P ₂ branch position, causing strip damage, and when Vp>Vs, because the conveying speed Vp of the pinch roller 17 for coiling is set to be higher than that of the trailing strip. The conveying speed Vs of _S2 is high, so it is possible to prevent the front end of the trailing strip _S2 from being piled up on the entrance side of the pinch roller 17 for coiling. The actual value of the plate speed Vs can be obtained from the target speed of the reel 2 before cutting or the roll rotation speed of the finishing mill, and Vm and Vp can be set to satisfy the above conditions based on the actual value of the plate speed Vs.

Here, tension can be applied to the strip _S1 by the finishing mill and the reel 2 before the above-mentioned cutting, and the coiling control by the reel 2 so far is preferably to control the coiling torque.

That is to say, the motor 32 is feedback-controlled so that the detected torque value of the motor 32 measured by the torque detector 34 coincides with the target torque value, so that the tension of the steel strip _S1 is kept constant. After the steel shearing machine 5 cuts off the tail end of the strip steel S ₁ , it is rolled into a coil shape immediately, and the strip steel S ₁ rolled into a coil shape is pressed by the outer winding roller 19, and the reel 2 is decelerated and stopped rotating at the same time . After the rotation has stopped, the coil of strip S ₁ is removed from drum 2.

After the strip _S1 is cut by a strip shear, tension cannot be applied between the finishing mill and the reel 2, so the coiling control of the reel 2 is changed from torque control to speed control after cutting , tension can be applied to the strip _S1 by torque control until it is cut, and the strip _S1 can be coiled tightly, and the coiling speed of the strip _S1 after cutting can be set to Vm>Vp>Vs.

In addition, before the preceding strip _S1 is cut by the strip shear 5, the winding control of the reel 2 may be switched from torque control to speed control in advance.

Next, the strip coiling method according to Embodiment 3 of the present invention will be described with reference to FIGS. 5 to 7 . This embodiment can be applied to the above-mentioned first and second embodiments, and the case of applying to the first embodiment is taken as an example here. Therefore, parts that overlap with those of the first embodiment are assigned the same reference numerals with reference to FIG. 1 , and description thereof will be omitted.

Before the strip is cut, the coiling pinch roll 105 on the outlet side of the strip shear rotates at the same speed as the target strip speed Vs (m/s). After the strip is cut by the strip shear 102, the target strip velocity V _p2 (m/s) of the pinch roll 105 for coiling is set to a value greater than the target strip velocity Vs, and the preceding strip S The set winding speed Vm (m/s) of ₁ is set to a value larger than the target plate speed V _p2 of the pinch roller 105 for winding. Therefore, the rotation speed of the coiling pinch roll 105 increases after the strip is cut. When the strip speed of the leading strip S ₁ is about to rise to the set coiling speed Vm, the pinch roller 105 for coiling presses the leading strip S ₁ , so the rotational speed of the pinch roller 105 for coiling tends to increase with As the strip speed of the preceding strip _S1 increases, it rises to a value close to the set coiling speed Vm.

At this time, since the target plate speed V _p2 of the pinch rolls 105 for coiling is set to be smaller than the set coiling speed Vm, that is, the plate speed of the preceding strip _S1 after cutting, the pinch rolls 105 for coiling The motor 117 (driver) of the lower pinch roller 105a generates torque on the decelerated side of the pinch roller 105 for take-up. For this reason, after the cut-off, the load torque of the motor 117 is changed from the forward rotation direction to the reverse rotation direction. In addition, when the tail end of the preceding strip _S1 is separated from the coiling pinch roll 105, the coiling pinch roll 105 decelerates. The pinch roller 105 exerts a large pressure on the preceding strip _S1 , so when the preceding strip _S1 passes through the pinch roller 105, the torque to the decelerating side of the motor 117 increases, and the trailing end of the preceding strip _S1 is separated After the pinch roller 105 for winding, when the pinch roller 105 for winding is decelerated, although the speed is set so that V _p2 >Vs, as shown in FIG. The target strip speed of the strip (the speed of the backward strip) is small, and then stabilizes at the set strip speed V _p2 .

After the tail end of the preceding strip _S1 leaves the coiling pinch roll 105, it takes only about 0.3 seconds until the leading end of the following strip _S2 is bitten into the coiling pinch roll 105, which is very short. Therefore, as described above, When the rotational speed of the pinch roll 105 for coiling is slower than the plate speed Vs of the strip _S2 running behind, when the front end of the strip _S2 running behind is bitten into the pinch roll 105 for coiling, due to the pinch roll 105 for coiling, The feeding speed of _the feeding strip by the feed roller 105 is lower than the strip speed of the trailing strip _S2 , so as shown in FIG. The phenomenon of stacking steel is formed.

Therefore, in this embodiment, the torque limit T _max (N·m) on the deceleration side is set on the driving device of the pinch roller 105 for winding, that is, the motor 117, and the motor 117 is controlled by the speed control device 120, The load torque of the motor 117 should not exceed the torque limit T _max on the deceleration side.

Here, when the front end of the trailing strip _S2 is bitten into the coiling pinch roll 105, as shown in _FIG . The values of speed Vs and torque limit T _max can be obtained as follows.

Referring to FIG. 5 , taking the case of driving the lower pinch roller 105 a of the pinch roller 105 for winding as an example, the torque limit T _max on the deceleration side set on the motor 117 driving the lower pinch roller 105 a value is explained.

The lower pinch roller 105a is driven to rotate by the motor 117 through the gears 221 and 222 . Fig. 5 shows the state where the preceding strip _S1 is pushed by the pinch roller 105. In this state, since the strip speed Vs of the preceding strip _S1 is greater than the set velocity V _p2 of the lower pinch roller 105a, the lower The pinch roller 105a receives only a force of F(N) from the preceding strip _S1 , and the motor 117 generates a torque T _M (N·m) opposing it.

At time t, it is assumed that the lower pinch roller 105a receives a force F(t)(N) from the leading steel strip _S1 , and the torque generated by the motor 117 against this is T _M (t)(N·m) , the moment of inertia of the lower pinch roller 105a and the gear 221 is J ₂ (N·m ² ), the moment of inertia of the motor 117 and the gear 222 is J ₁ (N·m ² ), the tail end of the leading strip S ₁ is about to leave The angular velocity of the lower pinch roller 105a when winding the pinch roller 105 is ω ₂ (rad/sec), the angular velocity of the motor 117 is ω ₁ (rad/sec), and the torque generated on the gear 222 is T(t)( N·m), the reduction ratio of the gear 221 and the gear 222 is i, and the roll diameter of the lower pinch roller 105a is D (m), then the mechanical equation of the following formula (13) is established. Here, the sign of T _M assumes that the torque on the forward rotation side (acceleration side) is "+", and the torque on the reverse rotation side (deceleration side) is "-". $\frac{1}{i}{T}_{\left(t\right)}-f_{\left(t\right)}\frac{\mathrm{D.}}{2}=J_2\frac{d{\mathrm{\&omega;}}_2}{\mathrm{dt}}---\left(13\right)$

Between the motor 117 and the gear 222, a dynamic equation of the following equation (14) holds. $T_{m\left(t\right)}-T_{\left(t\right)}=J_1\frac{{\mathrm{d\&omega;}}_1}{\mathrm{dt}}----\left(14\right)$

When T _(t) is eliminated by the formulas (13) and (14), the following formula (15) holds. $T_{m\left(t\right)}-i\&bull;f_{\left(t\right)}\frac{\mathrm{D.}}{2}=(J_1+{\mathrm{<figure-callout\; id="2"\; label="J"\; filenames="A9980656800361.png"\; state="\{\{state\}\}">J</figure-callout>}}_2\&bull;i^2)\frac{{\mathrm{d\&omega;}}^1}{\mathrm{dt}}---\left(15\right)$

When the formula (15) is integrated, the following formula (16) is established. ${\&Integral;}_{11}^{12}(T_{m\left(t\right)}-i\&bull;f_{\left(t\right)}\&bull;\frac{\mathrm{D.}}{2})\mathrm{dt}$ $=(J_1+{\mathrm{<figure-callout\; id="2"\; label="J"\; filenames="A9980656800361.png"\; state="\{\{state\}\}">J</figure-callout>}}_2\&bull;i^2){\&Integral;}_{{\mathrm{\&omega;}}_{t1}}^{{\mathrm{\&omega;}}_{t2}}d{\mathrm{\&omega;}}_1---\left(16\right)$

Here, ωt ₁ and ωt ₂ are the angular velocities of the lower pinch roller 105 a at times t ₁ and t ₂ , respectively. In formula (16) _, F ₍ t )=0.

Here, when the tail end of the preceding strip _S1 leaves the coiling pinch roll 105 (t=0), until the leading end of the following strip _S2 is bitten into the coiling pinch roll 105 [t=0 The speed change amount Δω (rad/sec) of the lower pinch roller 105a at t ₂ (sec)] was calculated. When the sign of the change amount Δω is "-", it decelerates, and when it is "+", it accelerates.

Then, (16 formula) can be represented by following formula (16A). ${\&Integral;}_0^{t2}{T}_{m\left(t\right)}\mathrm{dt}=(J_1+{\mathrm{<figure-callout\; id="2"\; label="J"\; filenames="A9980656800361.png"\; state="\{\{state\}\}">J</figure-callout>}}_2\&bull;i^2){\&Integral;}_{{\mathrm{\&omega;}}_0}^{{\mathrm{\&omega;}}_{t2}}d{\mathrm{\&omega;}}_1---\left(16A\right)$

T _M(t) is the change from T _max to the "+" side when the leading strip S ₁ flicks. In order to evaluate the change Δω in a stricter (larger) direction, simply assume that T _M(t) =T _max , the following formula (17) holds. ${\&Integral;}_0^{t2}{T}_{\max }\&bull;\mathrm{dt}=(J_1+{\mathrm{<figure-callout\; id="2"\; label="J"\; filenames="A9980656800361.png"\; state="\{\{state\}\}">J</figure-callout>}}_2\&bull;i^2){\&Integral;}_{{\mathrm{\&omega;}}_0}^{{\mathrm{\&omega;}}_{t2}}d{\mathrm{\&omega;}}_1---\left(17\right)$

Solution (17), after the tail end of the leading strip S ₁ leaves the pinch roll, the variation Δω of the lower pinch roll after _t2 time is expressed by the formal (18). $\mathrm{\&Delta;\&omega;}=\frac{T_{\max }\&bull;t_2}{J_1+{\mathrm{<figure-callout\; id="2"\; label="J"\; filenames="A9980656800361.png"\; state="\{\{state\}\}">J</figure-callout>}}_2\&bull;i^2}-----\left(18\right)$

If the conveying speed Vs of the front end of the trailing strip _S2 satisfies the following formula (19), then the front end of the trailing strip _S2 on the inlet side of the lower pinch roller 105a will not pile up steel. $V_S\&le;({\mathrm{\&omega;}}_0+\mathrm{\&Delta;\&omega;})\frac{\mathrm{D.}}{2}---\left(19\right)$

Here, due to ω. It will not be smaller than the set angular velocity ωp ₂ of the lower pinch roll 105a, so even if it is approximately ω ₀ ≈ωp ₂ , there is no problem. Therefore, on the entrance side of the pinch roll 105 for coiling, only the trailing strip It is sufficient that T _max at which no steel build-up occurs at the front end of S ₂ satisfies the relationship from the above formula (18) and (19) to the following formula (20-4). $V_S\&le;({\mathrm{\&omega;}}_0+\mathrm{\&Delta;\&omega;})\frac{\mathrm{D.}}{2}$ $=({\mathrm{\&omega;}}_{\mathrm{<figure-callout\; id="2"\; label="p"\; filenames="A9980656800361.png"\; state="\{\{state\}\}">p</figure-callout>}2}+\frac{T_{\max }\&bull;t_2}{J_1+{\mathrm{<figure-callout\; id="2"\; label="J"\; filenames="A9980656800361.png"\; state="\{\{state\}\}">J</figure-callout>}}_2\&bull;i^2})\&times;\frac{\mathrm{D.}}{2}-------(20-1)$ $\frac{V_S\&times;2}{\mathrm{D.}}-{\mathrm{\&omega;}}_{\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="A9980656800361.png"\; state="\{\{state\}\}">P</figure-callout>}2}\&le;\frac{T_{\max }\&bull;t_2}{J_1+{\mathrm{<figure-callout\; id="2"\; label="J"\; filenames="A9980656800361.png"\; state="\{\{state\}\}">J</figure-callout>}}_2\&bull;i^2}-----(20-2)$ $\frac{J_1+{\mathrm{<figure-callout\; id="2"\; label="J"\; filenames="A9980656800361.png"\; state="\{\{state\}\}">J</figure-callout>}}_2\&bull;i^2}{{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="A9980656800361.png"\; state="\{\{state\}\}">t</figure-callout>}}_2}\&bull;(\frac{{2V}_{\mathrm{the\; s}}}{\mathrm{D.}}-{\mathrm{\&omega;}}_{P2})\&le;T_{\max }---(20-3)$ $\frac{2(J_1+{\mathrm{<figure-callout\; id="2"\; label="J"\; filenames="A9980656800361.png"\; state="\{\{state\}\}">J</figure-callout>}}_2\&bull;i^2)(V_S-{\mathrm{\&omega;}}_{\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="A9980656800361.png"\; state="\{\{state\}\}">P</figure-callout>}2}\&bull;\mathrm{D.}/2)}{\mathrm{<figure-callout\; id="2"\; label="D.\; t"\; filenames="A9980656800361.png"\; state="\{\{state\}\}">D.</figure-callout>}{t}_{}{}_2}\&le;T_{\max }---(20-4)$

Here, Vs-ω _p2 ·D/2=Vs-V _p2 is obtained from the formula (20-4). This is because V _p2 >Vs. Therefore, according to the formula (20-4), it is judged that T _max is greater than 1 approximation of . That is, the torque limit on the deceleration side can be calculated.

The conveying speed Vs at the front end of the trailing strip _S2 , the moment of inertia _J1 of the motor 117 and the gear 222, the moment of inertia _J2 of the lower pinch roller 105a and the gear 221, the diameter D of the lower pinch roller, and the reduction ratio i can be determined in advance , the set angular velocity ω _p2 of the lower pinch roller 105a, and, after the trailing end of the preceding strip _S1 leaves the pinch roller 105 for coiling, until the front end of the following strip _S2 is bitten into the pinch for coiling The time t ₂ before the delivery roller 105 can also be judged in advance from the relationship between the conveying speed Vs of the trailing strip S ₂ and the coiling speed Vm of the preceding strip S _1. Therefore, as long as the setting satisfies the above (20-4 ) formula T _max is enough.

In this way, as long as the torque limit T _max on the deceleration side is set on the drive motor 117 of the pinch roll 105 for coiling, the period during which the pinch roll 105 for coiling pushes the preceding strip _S1 after the strip is cut , the motor 117 is generated according to the speed difference between the target coiling speed Vm of the preceding strip _S1 (the set coiling speed of the downstream side coiler 104) and the target strip speed _Vp2 of the pinch roll 105 for coiling. The load torque on the deceleration side will not be too large, and the speed of the coiling pinch roller 105 will not be lower than that of the trailing strip _S2 just after the tail end of the preceding strip S1 leaves the coiling pinch roller ₁₀₅ . The plate speed Vs.

Next, Embodiment 4 of the present invention, that is, a coiling method for a steel strip, will be described with reference to FIGS. 8 to 10 .

In continuous hot rolling strip coiling, the strip tension is applied between the finishing mill and the reel, and stable strip threading and coiling can be performed. Here, as a means of applying tension, it is generally to apply a tension as high as an optimally set tension reference in advance, which is based on the tension reference applied to the strip during coiling, that is, according to the coiling tension during coiling. The temperature condition and the steel type of the coiled steel strip are preset, and the tension control is performed by generating a torque on the reel during coiling, and the torque can apply a tension equal to the tension reference to the strip steel.

However, in continuous hot rolling, after cutting the steel strip sent out from the finishing mill, it is coiled alternately on several coils, so the time from the coiling of each coil to the start of coiling of the next strip is very short. , To try to remove the coiled coil (strip steel) in a short period of time, the preparation for the next coiling must be completed in a very short period of time. Therefore, although it is necessary to stop the rotation of the reel after coiling in a short time, since the outer winding roller (pink roller) is in contact with the surface of the strip steel wound into a coil shape before the coiling is completed, the outer winding roller A torque is generated that hinders the rotation of the reel during winding, so the reel decelerates. As a result, slack occurs in the strip between the outer winding roll and the pinch roll, resulting in a phenomenon of stacking of the strip.

In order to use the general hot-rolling coiling model for simulation, the coil is regarded as a rigid rotating body, and the model shown in Figure 8 is selected.

That is to say, the inner diameter of the coil is a (m), the outer diameter is b (m), the tension acting on the strip is T (KN), and the torque generated on the reel is T _MD (KN · m), and when the inertial force of the coil is I _c and the angular velocity is ω (rad/s), the kinematic equations for the coil are expressed as follows.

I _c (dω/dt)=T _MD (a/2)-T(b/2)-4F...(21)

However, F is the tension generated by one outer winding roll, and four outer winding rolls are installed in a coiler in a general hot rolling mill.

In the above formula (21), the third item of the right formula is zero at the stage before the outer winding roller contacts the strip steel, and in the case of constant tension control of the reel, since the torque generated by the reel is controlled as Item 1 and Item 2 are in balance, so the left-hand formula is zero.

However, in the abnormal state at the moment when the outer winding roller contacts the strip, the left formula becomes negative, and a negative angular velocity is generated, that is, the reel decelerates. In this case, the tension applied to the strip decreases, and the strip becomes slack between the outer winding roll and the pinch roll. Such slack causes so-called slack coils or tower-shaped coils to cause coiling failures.

Thus, in this embodiment, stable strip coiling for continuous hot rolling is achieved. In addition, this embodiment can be applied to the above-mentioned embodiment 1 and embodiment 2, and the case of applying to embodiment 2 is taken as an example here. Therefore, some parameters that overlap with those in Embodiment 2 use the same symbols as shown in FIG. 4 , and their descriptions are omitted.

In this embodiment, for example, when the strip is cut by the strip shear 5, the rotation control of the motor 32 of the reel 2 at the coiling end position is switched from the conventional torque control to the rotational speed control. Specifically, it is also possible to switch to rotational speed control according to the timing at which the strip shearer 5 operates, because in the state of controlling the torque of the reel 2, when the shearer 5 cuts the strip, the force applied to the strip is released. Therefore, the rotation speed can also be set as an upper limit value, and when the actual rotation speed reaches the upper limit value, it will automatically switch to speed control.

The outer winding roller 19 is provided so as to advance and retreat with respect to the reel 2 through a hydraulic cylinder (both not shown) having a hydraulic pump and a servo valve equally arranged along the outer circumference of the coil, and a driving source (not shown) is used. Rotary drive is also possible. In this embodiment, when the cutting is performed, after the reel 2 is switched to rotational speed control, the outer winding roller 19 is brought into contact with the outer peripheral surface of the coil to brake the coil. In addition, the outer winding roll 19 can also be used as a guide for the strip when the coil 2 starts to coil the strip. The position of the outer winding roller 19 relative to the coil can be grasped by a position detector (not shown), and it can also be brought into contact with the coil with high precision.

Next, until the coiling of the strip is completed, the actual changes in the rotational speed (plate speed: mpm) and torque of the reel 2 are measured for the following two cases: When the drum 2 is under torque control, and when the coiling is about to be completed, the torque control of the drum 2 is switched to the rotational speed control in conjunction with the cutting operation of the strip.

From this result, the case where torque control is continued is shown in FIG. 9 , and the case where rotation speed control is switched is shown in FIG. 10 . That is, although it clearly shows that the reel rotation speed decreases when the outer winding roller 19 is in contact with the coil in Fig. 9, it can be seen from Fig. 10 that when the strip steel cutting starts to switch to speed control, the reel rotation speed does not change. Reduced, the coil does not produce slack.

Here, it is preferable to set the rotational speed of the reel 2 faster than the moving speed of the preceding strip _S1 . This is because when the reel 2 is switched from torque control to speed control, the target of the speed control value is set to be faster than the actual speed value at that time, so that the reel 2 can definitely tighten the strip steel .

The period when the outer winding roller 19 and the strip begin to contact is set as the period from when the strip is cut until it breaks away from the pinch roller 17 for coiling. At the same time, the outer winding roller 19 can quickly perform the braking action of the coil rotation.

Next, other forms will be described.

As described above, before the strip is cut by the strip shear 5, the coil 2 tensions the strip wound on the drum 2 with a predetermined coiling tension, thereby performing torque control and coiling. Then, the strip is cut by the strip shear 5, and here, the torque control of the reel 2 is continued after the cutting. After the above-mentioned cutting, tension is applied to the steel strip by the pinch roll 17 and the mandrel 2, and coiling is continued in this state.

Then, when the outer winding roller 19 is brought into contact with the coil, a tension force of the same size as before is applied to the steel strip, and when the reel 2 is wound up with a corresponding torque, when the outer winding roller 19 is brought into contact with the strip. At the moment when the rolls come into contact, the rotation speed of the drum 2 decreases, and the aforementioned tension decreases, resulting in an unwinding phenomenon. Therefore, when the outer winding roller 19 is brought into contact with the coil outer peripheral surface, the above-mentioned tension setting value is changed to a value higher than the previous setting value. In the above (21) formula, the four outer winding rollers 19 are in contact with the outer peripheral surface of the coil, so that the tension of the strip steel is only reduced by 4F, so when the outer winding rollers 19 are brought into contact with the coil, only the tension It is enough to increase the setting value of 4F or more.

Next, a strip coiling method as a fifth embodiment of the present invention will be described with reference to FIGS. 11 to 15 . This embodiment can be applied to the first and second embodiments described above. However, the setting of the pushing force by the compensating pushing force setter 124 of the first embodiment is not used here, but the case of applying this embodiment is taken as an example. Therefore, parts that overlap with those of the first embodiment are assigned the same symbols with reference to FIG. 1 , and description thereof will be omitted.

When changing the offset angle of the above-mentioned pinch rolls 105 for coiling, if the pressing force of the upper pinch roll 105b on the strip is not appropriate, in the case of a thin strip, the preceding strip S coiled by the downstream side coiler 104 will ₁ cannot be fully clamped by the upstream side coiler 105, so the tail end of the preceding strip S ₁ breaks away from the upstream side coiler pinch roll 105 to produce steel stacking, and contacts with the triangular gate 128 Tail end cracks often occur, and in the case of thick strips, the trailing strip _S2 may not be normally guided into the upstream side coiler 101 in some cases.

After cutting, the time from the time the preceding strip _S1 leaves the coiling pinch roll 105 to the time before the trailing strip _S2 is bitten into the coiling pinch roll 105 is relatively long. Next, during the pressure control of the pinch rolls 105 for coiling, the pressure load becomes zero due to the tailing of the preceding strip _S1 , so the roll gap of the pinch rolls 105 for coiling moves in the closing direction, and there is a Risk of poor biting of the trailing strip S ₂ .

Therefore, in this embodiment, setting the appropriate pressing force of the coiling pinch roller on the exit side of the strip shearing machine prevents the tail end of the strip from being broken and at the same time minimizes the bending direction of the trailing strip. suitable. Furthermore, the front end of the trailing strip is bitten into the coiling pinch roll without causing a biting failure.

Next, detailed description will be given.

FIG. 14 is a diagram showing a state where the lower pinch roller 105 a is retracted upstream by an amount ΔL relative to the upper pinch roller 105 b. FIG. 15 is a diagram showing a state where the upper pinch roller 105b is pressed down by the pressure P after the lower pinch roller 105a is shifted.

The product P·Δx of the pressure P of the pinch roller 105 and the vertical displacement Δx of the pinch roller 105 caused by the pressure P is the work done by the pressure P.

Assuming that when the upper pinch roller 105b is located at position x, the pressure on the upper pinch roller 105b is P(x), and the amount of work done when the upper pinch roller 105b is pressed down from the position x=0 to the position x=Δx is given by Formula (22) expresses. ${\&Integral;}_0^{\mathrm{\&Delta;x}}P\left(x\right)\&bull;\mathrm{dx}-----\left(\mathrm{twenty\; two}\right)$

When the upper pinch roller 105b presses the strip steel down by Δx, as shown in Figure 15, the strip steel displaces in the direction of tension application. Assuming that the displacement at this time is Δu, the work required for the displacement of Δu corresponding to the tension F The amount is F·Δu.

The strip is pressed to the state shown in FIG. 15 with the upper pinch roll 105b, and the strip is bent and deformed along the outer peripheral surface of the lower pinch roll 105a at the inlet side of the pinch roll 105, and at the exit side of the pinch roll 105, the The steel strip is subjected to bending deformations such as bending deformation along the lower pinch roll 105a and bending deformation along the outer peripheral surface of the upper pinch roll 105b.

Utilizing the effect of the bending moment M _B produced on the strip steel, the amount of bending work performed when bending with the radius of curvature R and the bending length I is represented by M _B (1/R), assuming that the lower pinch roll 105a and the upper pinch roll The radii of the rollers 105b are RL _and R _U respectively, the part where the strip is wound on the lower pinch roller 105a is set along the length of the roller, and the part where the strip is wound on the upper pinch roller 105b is respectively set along the length of the roller. is l _a and l _b , then the amount of work done by the pinch roll 105 inlet side to bend the strip along the outer peripheral surface of the pinch roll 105a is represented by M _B ·(l _a /R _L ), along the pinch roll 105 The bending deformation of the lower pinch roll 105a on the exit side corresponding to the amount of bending deformation, the bending deformation of the strip along the outer peripheral surface of the upper pinch roll 105b, and the bending deformation corresponding to the outer circumference of the upper pinch roll 105b The amount of work required for the bending deformation of the surface is represented by M _B (l _a /R _L ), M _B (l _b /R _U ), and M _B (l _b /R _U ) respectively.

Therefore, the total amount of work required for bending deformation and bending deformation at the entrance and exit sides of the pinch roller 105 is 2M _B {(l _a /R _L )+(l _b /R _U )}.

The difference between the amount of work required to move the upper pinch roller 105b from the position of x=0 to the position of x=Δx minus the amount of work required to make the strip displace Δu in the tension F, and the difference between the amount of work required to make the strip bend The amount of work required for deformation and bending back deformation is equal, so the following formula (23) is established. ${\&Integral;}_0^{\mathrm{\&Delta;x}}P\left(x\right)\&CenterDot;\mathrm{dx}-f\&Center\; Dot;\mathrm{\&Delta;u}$ $=2m_B\{(l_a/R_L)+(l_b/R_u)\}---\left(\mathrm{twenty\; three}\right)$ Here, M _B can be represented by the following formula (24).

M _B =(1/6)σ _B ·t ² ·w...(24)

In the formula, the yield stress of the strip is σ _B , the thickness of the strip is t, and the width of the strip is W.

The present inventors have confirmed that the load required to press down the upper pinch roll 105b during the elastic deformation of the strip from the state where the upper pinch roll 105b is in contact with the strip is further confirmed to be one step. Functionally increase. Figure 11 shows the relationship between the pressure of the upper pinch roller and the displacement of the lower displacement of the upper pinch roller. This relationship is determined by the size of the pinch roll, the material and size of the strip, and the like. Therefore, if P(x) is regarded as a linear function of P(o)=o·P(Δx)=P ₀ , it can be expressed as P(x)=P ₀ ·x/Δx, so formula (23) can be used The following formula (25) shows that the following formula (26) is established from the formulas (25) and (24). $\frac{1}{2}\&bull;p_0\&bull;\mathrm{\&Delta;x}-f\&bull;\mathrm{\&Delta;\; u}$ $=2m_B\{(l_a/R_L)+(l_b/R_u)\}---\left(25\right)$ $P_0=f\&bull;\frac{2\mathrm{\&Delta;\; u}}{\mathrm{\&Delta;x}}+\frac{4}{\mathrm{\&Delta;x}}(\frac{l_a}{R_L}+\frac{l_b}{R_u})\&bull;\frac{1}{6}\&bull;{\mathrm{\&sigma;}}_B\&bull;{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="A9980656800361.png"\; state="\{\{state\}\}">t</figure-callout>}}^2\&bull;w--\left(26\right)$

In the formula:

P ₀ : Pinch roller pressure

F: Tension of strip steel

Δu: Displacement of strip steel due to tension F

Δx: The vertical displacement of the pinch roller due to the action of pressure P

M _B : Bending moment on the strip=(1/b)σ _B ·t ² ·W

σ _B : Yield stress of the strip

t: strip thickness

W: strip width

la: the coiled portion of the strip coiled along the down pinch roll along the length of the roll

R _L : Radius of the pinch roller

l _b : The coiled portion of the strip coiled along the upper pinch roll along the length of the roll

R _U : Radius of upper pinch roller

The displacement Δx and Δu can be calculated geometrically, the yield stress σ _B of the strip is a value determined according to the material, and the thickness t and width W of the strip are determined according to the material to be processed. Therefore, the most suitable pressure P can be calculated by determining the tension F of the strip steel according to the rotation speed of the coiling device and the rotation speed of the pinch roll. In this example, the pressure of the pinch rolls for winding is set to be equal to or greater than the P ₀ value determined by the above formula (26).

Fig. 12 and Fig. 13 are diagrams showing the actual pressure and the oil injection command diagram of the hydraulic cylinder for depressing the pinch roller. Fig. 12 shows the situation where the pressure setting of this embodiment is not performed, and Fig. 13 is the present embodiment. When the leading strip drifts from the pinch roller, the pressure drops rapidly to the no-load state, as shown in Figure 12, the oil injection command of the hydraulic cylinder acts in the direction of maintaining the pressure, so that the pinch roller moves in the clamping direction. For this reason, there is a possibility of occurrence of defective biting of the trailing strip. Even if there is no bad biting phenomenon, once the trailing strip is bitten into the pinch roller, the pressure will return to the set value after a sharp rise, and the oil injection command of the hydraulic cylinder will make the pinch roller move in the opening direction, like Such rapid changes can cause excessive motion and vibration.

And Figure 13 is after the pressure is set, after the leading strip drifts from the pinch roll until the trailing strip is bitten into the pinch roll, the servo valve is closed to keep the pinch roll gap constant and keep oiling, Therefore, the oil injection command of the hydraulic cylinder remains constant. Therefore, the backward strip will not cause bad biting phenomenon.

Possibility of industrial application

As can be seen from the above description, the present invention can achieve the following effects, that is, it can prevent the steel pile phenomenon of the leading strip from occurring on the exit side of the pinch roll for coiling, and at the same time prevent the front end of the trailing strip from being pinched by the coiling pinch roll. Steel pile phenomenon occurs on the entrance side of the roller.

In the case where the present invention is applied to a hot rolling line equipped with a rotary car type coiler, assuming the set coiling speed V _m of the above-mentioned reel and the target speed V _p of the above-mentioned coiling pinch roll at the time of cutting , The above-mentioned relationship of the strip speed V _s of the following strip steel immediately after cutting is V _m > V _p > V _s , the set coiling speed V _m refers to the pinch roll used for coiling and is coiled at the The set coiling speed of the above-mentioned reel after the tail end of the strip steel on the reel is cut by the above-mentioned strip steel shearing machine, in this way, the following effect can be obtained, that is, the preceding strip steel can be prevented from hanging On the front end of the guide plate at the branch position between the rolling line of the reel at the start position and the rolling line of the reel towards the coiling end position.

When the present invention is applied to a general hot rolling line, the coil coiled on the downstream side is cut by the above-mentioned strip shearing machine through the second pinch roll for coiling arranged on the inlet side of the downstream coil. When the tail end of the coil is on the drum, the target speed V _p1 of the above-mentioned second pinch roll for coiling, the target speed V _p2 of the first pinch roll for coiling arranged on the exit side of the strip shearing machine, and the above The relationship between the target strip speed V _s of the trailing strip immediately after cutting and the set coiling speed V _m of the above-mentioned downstream side reel is V _m > V _p1 > V _p2 > V _s . The effect of strip steel damage caused by the tail end of the strip hanging on the triangular door.

In this case, after the lower pinch roll of the first coiling pinch roll is shifted, until it is cut by a strip shear, it passes through the second coiling pinch roll and is wound on the downstream side coil. During the period at the tail end of the upper strip, the speed of the lower pinch roll is lower than the target strip speed V _s of the trailing strip. until the actual value of the torque of the lower pinch roller reaches the predetermined set value, the pressure at this time is used as the set pressure of the upper pinch roller to the strip when it is offset, so that the first pinch roller can be used The pinch roll for coiling well holds the tail end of the strip to be coiled on the downstream side reel, therefore, the slip between the tail end of the strip and the pinch roll for coiling on the upstream side can be reliably eliminated. effect of the phenomenon.

Before the strip cut by the strip shearing machine passes through the above-mentioned pinch roll for coiling arranged on the outlet side of the strip shearing machine, and is continuously coiled by the above-mentioned reel, the pressure of the pinch roll for coiling is Set it larger than the P value determined by P=F(Δu/Δx)+2(M _B /Δx){(l _a /r)+(l _b /R)}, so that the upper pinch can be The pressure of the rolls is set to an optimum value, so it is possible to prevent cracks at the tail end of the thin strip and poor guidance of the thick strip guide coiler.

In this case, after the above-mentioned pressure is set, the gap between the above-mentioned pinch rolls for coiling can be maintained from the tail of the preceding strip until the following strip is bitten, so as to prevent the following strip from being bitten. The effect of phenomena such as poor bite of the pinch roller for winding.

Before the reel finishes rolling the strip, the coiling control of the reel is changed from torque control to speed control, and then the pinch roller is pressed on the strip rolled into a coil to make the above reel Stop the rotation, or before the above-mentioned reel has finished coiling the strip steel, control the torque of the reel to take up the strip steel to increase the tension of the strip steel, and then press the pinch roller on the coiled strip to form a coil On the strip steel, the above-mentioned reel stops rotating. In this way, the deceleration of the coil due to contact with the pinch roller can be prevented, and the occurrence of unwinding or tower-shaped outer coils of the coil can be avoided. After the coiling is completed, when the rotation of the coil is stopped, because the pinch roller has a braking force, the effect of stopping the rotation of the coil in a short time can be obtained.

After the strip is cut by the above-mentioned strip shear, when the front end of the trailing strip is bitten into the above-mentioned coiling pinch roll disposed on the exit side of the strip shear, the above-mentioned coiling pinch roll The torque limit on the deceleration side of the driving device is set so that the peripheral speed of the pinch roller for coiling is faster than the conveying speed of the trailing strip. It is possible to obtain the effect of preventing the steel sheet piled up on the entrance side of the pinch roll for coiling when the succeeding strip is carried out.

Claims (11)

1. strip coiling method, the band steel of milling train being sent with band steel cutter cuts into specific length, batches by being configured in batching of above-mentioned band steel cutter outlet side with pinch roll and the reel that the utilizes devices for taking-up band steel after to cut-out,

It is characterized in that: will batch after the afterbody that twists in the band steel on the above-mentioned reel with pinch roll cuts off by above-mentioned with above-mentioned band steel cutter, above-mentioned transporting velocity of batching peripheral speed with the pinch roll back row band steel after than above-mentioned firm cut-out is fast, and slower than the coiling speed of batching above-mentioned band steel with above-mentioned reel.

2. strip coiling method as claimed in claim 1, it is characterized in that: above-mentioned reel is the reel of carrousel formula taking-up equipment, to batch after the tail end that twists in the band steel on the above-mentioned reel with pinch roll cuts off the setting coiling speed V of above-mentioned reel by above-mentioned with above-mentioned band steel cutter _m, the above-mentioned target velocity V that batches with pinch roll during this cut-out _p, the back row band steel after the above-mentioned firm cut-out plate speed V _sRelation be set at V _m＞V _p＞V _s

3. strip coiling method, the band steel of milling train being sent with band steel cutter cuts into specific length, batch with pinch roll and utilize the reel of upstream side devices for taking-up and the reel of downstream devices for taking-up alternately to batch by being configured in the 1st of above-mentioned band steel cutter outlet side

It is characterized in that: batching with pinch roll and batch after the tail end of the band steel on this downstream reel cuts off by being configured in the 2nd of downstream reel entrance side, the above-mentioned the 2nd batches the target velocity V of usefulness pinch roll with above-mentioned band steel cutter _P1, the above-mentioned the 1st target velocity V that batches with pinch roll _P2, the back row band steel after the above-mentioned firm cut-out Target Board speed V _sAnd the setting coiling speed V of above-mentioned downstream reel _mRelation set V for _m＞V _P1＞V _P2＞V _s

4. strip coiling method as claimed in claim 3, it is characterized in that: after the above-mentioned the 1st bottom pinch roll skew of batching with pinch roll, up to above-mentioned band steel cutter will by the above-mentioned the 2nd batch the afterbody that is batched the band steel on the reel of above-mentioned downstream with pinch roll before cutting off during this period of time in, set the speed of above-mentioned the 1st bottom pinch roll than the Target Board speed V of above-mentioned back row band steel _sLow, in this state, utilize the above-mentioned the 1st top pinch roll pressure zone steel that batches with pinch roll, till the actual torque of above-mentioned the 1st bottom pinch roll reached predefined setting value, top pinch roll was to the setting pressure of this band steel when to make at this moment pressure be above-mentioned skew.

5. as each the described strip coiling method among the claim 1-3, it is characterized in that: by be disposed at this band steel cutter outlet side above-mentioned batch the band steel that batches continuously with pinch roll, with above-mentioned reel after being cut off by above-mentioned band steel cutter before, this is batched pressure with pinch roll is set in more than the P value that following formula determines.

P=2F(Δu/Δx)+4(M _B/ΔX){(l _a/R _L)+(l _b/R _U)}

In the formula:

P: the pressure of pinch roll

F: the tension force of band steel

Δ u: the band steel displacement that produces because of tension force F

Δ x: the vertical displacement amount of the pinch roll that produces because of pressure P

M _B: bending moment=(1/6) σ that produces on the band steel _BT ²W

σ _B: the yield stress of band steel

T: belt steel thickness

W: strip width

L _a: the reel-up of band coil of strip on bottom pinch roll is along the length of roller

R _L: the radius of bottom pinch roll

L _b: the reel-up of band coil of strip on top pinch roll is along the length of roller

R _U: the radius of top pinch roll

6. strip coiling method as claimed in claim 5 is characterized in that: set after the above-mentioned pressure, from kept before the above-mentioned roll gap that batches with pinch roll with being with steel to be nipped to the back row behind the steel whipping in advance always.

7. as claim 1 or the described strip coiling method of claim 2, it is characterized in that: above-mentioned reel and above-mentioned batching with the velocity ratio of pinch roll in accelerator are that it is set relatively with above-mentioned reel and above-mentioned batching with the ratio of the final speed of pinch roll.

8. as each the described strip coiling method in the claim 1～7, it is characterized in that: before with above-mentioned reel strip coiling being finished, the control of batching the band steel by reel is changed into rotating speed control from torque control, hold-down roller is pressed on the band steel that is rolled into roll coil of strip shape then, makes above-mentioned reel stop revolution.

9. as each the described strip coiling method in the claim 1～7, it is characterized in that: before with above-mentioned reel strip coiling being finished, utilize of the torque control of this reel with steel, to improve the tension force of band steel, hold-down roller is pressed on the band steel that is rolled into roll coil of strip shape then, makes above-mentioned reel stop revolution.

10. as each the described strip coiling method in the claim 1～9, it is characterized in that: above-mentioned torque limit of batching with the drive unit deceleration side of pinch roll is to set like this, be that above-mentioned band steel cutter will be with after the steel cut-out, the front end of above-mentioned back row band steel is configured in batching when using pinch roll of this band steel cutter outlet side by nipping, this batches with the peripheral speed of pinch roll faster than the transporting velocity of above-mentioned back row band steel.

11. strip coiling method as claimed in claim 3 is characterized in that: it is above-mentioned downstream devices for taking-up and the above-mentioned the 2nd to be batched with the ratio of the target velocity of pinch roll set relatively that above-mentioned downstream devices for taking-up and the above-mentioned the 2nd batches with the velocity ratio of pinch roll in accelerator; The above-mentioned the 2nd batches that to batch with the velocity ratio of pinch roll in accelerator with pinch roll and the above-mentioned the 1st be to make the above-mentioned the 2nd to batch to batch with the ratio of the target velocity of pinch roll with pinch roll and the above-mentioned the 1st and set relatively.

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