JP2024088010A - Apparatus for removing liquid from a ribbon and method for controlling the same - Google Patents

Abstract

To provide a liquid removal device for a belt-shaped body which can support a roll without increasing volume of a cylinder which supports the roll pressed to the belt-shaped body, and a control method of the same.SOLUTION: A liquid removal device 3 for a belt-shaped body 1 comprises: an upper actuator 7 for pressing an upper roll 4 to a top surface of the belt-shaped body 1; a lower actuator 10 for pressing a lower roll 5 to a lower surface of the belt-shaped body 1; an upper roll chock 6 for rotatably supporting the upper roll 4; and a lower roll chock 8 for rotatably supporting the lower roll 5. In the liquid removal device, when the upper roll 4 and the lower roll 5 are pressed to the belt-shaped body 1, a stopper 11 being provided on a lower side of the lower roll chock 8 suppresses a movement of the lower roll chock 8 to a lower side.SELECTED DRAWING: Figure 4

Description

The present invention relates to an apparatus for removing liquid adhering to a strip and a control method thereof, and in particular to an apparatus for removing liquid adhering to a strip by pressing a pair of rolls arranged to sandwich the strip against the strip and a control method thereof.

In various surface treatment processes such as pickling, degreasing, water washing, and chemical conversion treatment, various surface treatments are performed by immersing a strip of steel material (hereinafter referred to as steel strip) in pickling liquid, plating liquid, etc. stored in a designated container. The steel strip is then removed from the container, and the pickling liquid, plating liquid, etc. adhering to the surface of the steel strip is removed, after which the steel strip is transported to the next process. Also, in the process of applying rust-preventive oil, etc. to the steel strip, excess oil is removed from the steel strip before it is transported to the next process.

One example of a method for removing the above-mentioned pickling solution, plating solution, and oil (hereinafter referred to as treatment solutions) from a steel strip is described in Patent Document 1. In this method, rolls called wringer rolls are placed on both the top and bottom sides of the steel strip, which is transported in a nearly horizontal state. The wringer rolls are pressed against the steel strip by an air cylinder to squeeze out and remove the liquid adhering to the steel strip.

In order to improve the equipment operating rate and reduce processing costs, it is preferable to pass multiple steel strips continuously between a pair of wringer rolls without interruption. For this purpose, for example, a welding machine that connects the rear end of the steel strip that is passed through the wringer roll to the leading end of another steel strip that follows it may be installed upstream of the wringer roll in the conveying direction of the steel strip. On the other hand, there are cases where a welding machine is not installed upstream of the wringer roll in the conveying direction. In such cases, the gap between the pair of wringer rolls is widened each time a new steel strip is passed between the pair of wringer rolls. Then, the leading end of the steel strip is passed between the pair of wringer rolls, and after the steel strip has been passed to a certain extent, the gap between the pair of wringer rolls is narrowed and the pair of wringer rolls is pressed against the steel strip.

JP 2001-271191 A

If a welding machine is not installed upstream of the pair of wringer rolls described in Patent Document 1 in the steel strip transport direction, it is necessary to widen the gap between the pair of wringer rolls each time a new steel strip is passed between the pair of wringer rolls.

In addition, the wringer roll is subject to wear and chemical corrosion because it comes into contact with both the steel strip and the treatment liquid. Therefore, the wringer roll must be replaced depending on the state of wear or chemical corrosion of the wringer roll, or at regular intervals. When replacing the wringer roll described in Patent Document 1, the support of the wringer roll by the air cylinder and the pressing of the wringer roll against the steel strip are released, and the wringer roll is replaced in this state. After replacing the wringer roll, the stroke of the air cylinder is adjusted. When the outer diameter of the wringer roll is changed, the installation position of the air cylinder may be changed in addition to adjusting the stroke of the air cylinder. Thus, with the method described in Patent Document 1, every time a new steel strip is passed between a pair of wringer rolls or the wringer roll is replaced, work such as adjusting the stroke of the air cylinder and changing the installation position is required.

In addition, each wringer roll described in Patent Document 1 is supported by an air cylinder and is not fixed. The lower air cylinder, located below the steel strip, receives a load according to the mass of the steel strip. Therefore, the pressing force and cylinder volume of the wringer roll by the lower air cylinder are greater than those of the upper air cylinder, located above the steel strip. In addition, in the unlikely event that the steel strip vibrates and a large load associated with the vibration acts on the lower air cylinder, the pressing force of the wringer roll by the lower air cylinder may be insufficient. In that case, the lower wringer roll cannot be pressed against the steel strip, and the treatment liquid may not be sufficiently squeezed out.

The present invention has been made to solve the above problems, and aims to provide a liquid removal device for a strip that can support a roll without increasing the volume of the cylinder that supports the roll pressed against the strip, and a control method for the same.

In order to achieve the above object, the present invention provides
[1] A liquid removal device for a strip comprising an upper roll pressed against the upper surface of a strip being continuously transported, a lower roll pressed against the lower surface of the strip, an upper actuator pressing the upper roll against the upper surface, a lower actuator pressing the lower roll against the lower surface, an upper roll chock rotatably supporting each of both ends of the upper roll and moving in the vertical direction integral with the upper roll, and a lower roll chock rotatably supporting each of both ends of the lower roll and moving in the vertical direction integral with the lower roll, the device removing liquid adhering to the strip by pressing the upper roll and the lower roll against the strip using the upper actuator and the lower actuator, and further comprising a stopper positioned below the lower roll chock to suppress movement of the lower roll chock downward when the liquid adhering to the strip is removed by pressing the upper roll and the lower roll against the strip.
[2] The liquid removal device for a strip described in [1] above, further comprising an evacuation device that positions the stopper below the lower roll chock and retracts the stopper from below the lower roll chock when the lower actuator pushes the strip up above the passing position of the strip in the vertical direction when the liquid adhering to the strip is removed by pressing the upper roll and the lower roll against the strip.
[3] The liquid removal device for a strip-shaped body described in [2] above, wherein the retraction device is provided on a fixed portion and comprises a slider that moves in the axial direction of the lower roll and an actuator that moves the slider in the axial direction, and the stopper is integrally provided on the slider.
[4] A method for controlling a liquid removal device for a strip described in [1] above, wherein, when increasing the gap between the upper roll and the lower roll from a state in which the upper roll and the lower roll are pressed against the strip and the lower roll chock is placed on the stopper, the upper roll and the lower roll are raised above a vertical position through which the strip passes when the liquid adhering to the strip is being removed by pressing the upper roll and the lower roll against the strip to remove the stopper from below the lower roll chock. and then, when the lower roll is lowered below the passing position and the upper roll and the lower roll are brought closer to each other from a state in which they are separated from each other and pressed against the strip, the lower roll is raised above the passing position to raise the lower roll chock and position the stopper below the lower roll chock, and then the lower roll is lowered to place it on the stopper, and the upper roll is lowered to press the upper roll and the lower roll against the strip.

According to the present invention, it is possible to support the roll without increasing the volume of the cylinder that supports the roll that presses against the strip.

FIG. 1 is a diagram showing an example of a surface treatment line for performing surface treatment on a strip-shaped steel material (hereinafter, referred to as a steel strip) that corresponds to the strip of the present invention. A front view showing the state in which the upper roll and the lower roll are separated from the steel strip. FIG. 2 is a diagram for explaining an example of an operation when pressing an upper roll and a lower roll against a steel strip. A front view showing the state in which the upper roll and the lower roll are pressed against the steel strip. 1 is a diagram for explaining an example of an operation when separating an upper roll and a lower roll from a steel strip. FIG.

The following describes an embodiment of the present invention. Figure 1 is a diagram showing an example of a surface treatment line in which pickling, degreasing, water washing, chemical conversion treatment, etc. are performed on a strip-shaped steel material (hereinafter referred to as a steel strip) corresponding to the strip-shaped body of the present invention. In the surface treatment line shown in Figure 1, the rolled steel strip 1 is unwound and conveyed to the surface treatment device 2 by a conveying device (not shown). The surface treatment device 2 performs the above-mentioned pickling, degreasing, water washing, chemical conversion treatment, etc., and may be configured in the same manner as a conventionally known surface treatment device. A wringer roll device 3 is provided downstream of the surface treatment device 2 in the conveying direction A of the steel strip 1, which removes treatment liquids such as pickling liquid, plating liquid, and oil adhering to the surface of the steel strip 1. In the wringer roll device 3, the steel strip 1 is conveyed in an almost horizontal state. The above-mentioned wringer roll device 3 corresponds to the liquid removal device of the present invention.

In the vertical direction H, the position where the steel strip 1 passes through the wringer roll device 3 is the pass line PL, and above the pass line PL, an upper wringer roll (hereinafter simply referred to as the upper roll) 4 is provided which is pressed against the upper surface of the steel strip 1. Also, below the pass line PL, a lower wringer roll (hereinafter simply referred to as the lower roll) 5 is provided which is pressed against the lower surface of the steel strip 1. The position of the pass line PL in the vertical direction H is determined by the design of the wringer roll device 3.

Figure 2 is a front view showing the state in which the upper roll 4 and the lower roll 5 are separated from the steel strip 1. The configuration of the wringer roll device 3 will be described with reference to Figure 2. Upper roll chocks 6 that hold the upper roll 4 rotatably are provided at both ends of the upper roll 4 in the direction of the central axis of rotation of the upper roll 4 shown in Figure 2. Above the upper roll chock 6, for example, to a frame (not shown) of the wringer roll device 3, an upper actuator 7 that moves the upper roll chock 6 in the vertical direction H is fixed. The upper actuator 7 only needs to be able to move the upper roll chock 6 in the vertical direction H, and may be a conventionally known device such as a linear motion device using a feed screw or a rack and pinion, or a single-acting or double-acting air cylinder.

When the upper actuator 7 shown in FIG. 2 is a single-acting air cylinder, the cylinder 7A is fixed to the frame, and the upper roll chock 6 is connected to the piston 7B. The piston 7B is pressed toward the lower roll 5 by supplying air from an air supply source (not shown) to an air chamber (not shown) partitioned by the cylinder 7A and the piston 7B. In addition, a return spring (not shown) is provided on the upper actuator 7. When the air in the air chamber is discharged and the pressing force of the piston 7B becomes lower than the elastic force of the return spring, the piston 7B is returned to its initial position by the elastic force of the return spring. In the example shown in FIG. 2, the piston 7B is located at its initial position. As a result, the upper roll 4 is located above the pass line PL.

When the upper actuator 7 is a double-acting air cylinder, the cylinder 7A is fixed to the frame, and the upper roll chock 6 is connected to the piston 7B. In a double-acting air cylinder, air chambers (not shown) are formed on both sides of the piston 7B. The piston 7B is pressed toward the lower roll 5 by alternately supplying and discharging air to the two air chambers, and the piston 7B is returned to its initial position. For example, the piston 7B is pressed toward the lower roll 5 by supplying air from an air supply source (not shown) to one of the two air chambers and discharging air from the other air chamber. Conversely, the piston 7B is returned to its initial position by discharging air from one air chamber and supplying air from an air supply source (not shown) to the other air chamber.

Lower roll chocks 8 that rotatably hold the lower roll 5 are provided at both ends of the lower roll 5 in the direction of the central axis of rotation of the lower roll 5. A lower actuator 10 that moves the lower roll chock 8 in the vertical direction H is fixed to a frame 9 of the wringer roll device 3 located below the lower roll chock 8. The lower actuator 10, like the upper actuator 7 described above, only needs to be able to move the lower roll chock 8 in the vertical direction H, and may be a conventional linear actuator using a feed screw or rack and pinion, or a single-acting or double-acting air cylinder.

When the lower actuator 10 shown in FIG. 2 is a single-acting air cylinder, the cylinder 10A is fixed to the frame 9, and the lower roll chock 8 is connected to the piston 10B. The piston 10B is pressed against the upper roll 4 by supplying air from the air supply source described above to an air chamber (not shown) partitioned by the cylinder 10A and the piston 10B. In addition, a return spring (not shown) is provided on the lower actuator 10. When the air in the air chamber is discharged and the pressing force of the piston 10B becomes lower than the elastic force of the return spring, the piston 10B is returned to its initial position by the elastic force of the return spring. In the example shown in FIG. 2, the piston 10B is located at its initial position. As a result, the lower roll 5 is located below the pass line PL.

When the lower actuator 10 is a double-acting air cylinder, the cylinder 10A is fixed to the frame, and the lower roll chock 8 is connected to the piston 10B. In a double-acting air cylinder, air chambers (not shown) are formed on both sides of the piston 10B. The piston 10B is pressed toward the upper roll 4 by alternately switching between supplying and discharging air to the two air chambers, and the piston 10B is returned to its initial position. For example, the piston 10B is pressed toward the upper roll 4 by supplying air from an air supply source (not shown) to one of the two air chambers and discharging air from the other air chamber. Conversely, the piston 10B is returned to its initial position by discharging air from one air chamber and supplying air from an air supply source (not shown) to the other air chamber.

The wringer roll device 3 according to the embodiment of the present invention includes a stopper 11 that supports the lower roll chock 8 and suppresses the movement of the lower roll chock 8 downward. The stopper 11 is configured to be movable in the width direction W of the wringer roll device 3, and when the upper roll 4 and the lower roll 5 are separated from each other, the stopper 11 is retracted to the outside of the wringer roll device 3 in the width direction W of the wringer roll device 3. Specifically, the stopper 11 and the retraction device 12 that reciprocates the stopper 11 in the width direction W are provided on each side of the wringer roll device 3 in the width direction W. The retraction device 12 includes a slider 13 that is configured to be movable on the frame 9 in the width direction W, and a retraction actuator 14 that reciprocates the slider 13 in the width direction W. The stopper 11 is provided integrally on the slider 13.

The stopper 11 supports the lower roll chock 8 when the upper roll 4 and lower roll 5 are pressed against the steel strip 1. Therefore, the combined height of the stopper 11 and the slider 13 in the vertical direction H is set to approximately the same height as the distance between the lower roll chock 8 and the frame 9 when the upper roll 4 and lower roll 5 are pressed against the steel strip 1. The slider 13 only needs to be able to move in the width direction W, and may be, for example, a cart.

The retraction actuator 14 may be any mechanism or device capable of reciprocating the slider 13, such as a linear motion device using a feed screw or a rack and pinion, a single-acting or double-acting air cylinder, a hydraulic cylinder, or any other conventionally known mechanism or device. When the retraction actuator 14 shown in FIG. 2 is a single-acting air cylinder, the cylinder 14A is fixed to the frame 9, and the slider 13 is connected to the piston 14B. The retraction actuator 14 is configured to press the piston 14B toward the lower roll chock 8 in the width direction W by supplying air from an air supply source to an air chamber (not shown) partitioned by the cylinder 14A and the piston 14B. In addition, a return spring (not shown) is provided in the retraction device 12. When the air in the air chamber is discharged and the pressing force of the piston 14B becomes lower than the elastic force of the return spring, the piston 14B is returned to its initial position by the elastic force of the return spring.

When the retraction actuator 14 is a double-acting air cylinder, the cylinder 14A is fixed to the frame 9, and the slider 13 is connected to the piston 14B. In a double-acting air cylinder, air chambers (not shown) are formed on both sides of the piston 14B. The piston 14B is pressed toward the lower roll chock 8 by alternately switching between supplying and discharging air to the two air chambers, and the piston 14B is returned to its initial position. For example, the piston 14B is pressed toward the lower roll chock 8 by supplying air from an air supply source (not shown) to one of the two air chambers and discharging air from the other air chamber. The piston 14B is returned to its initial position by discharging air from one air chamber and supplying air from an air supply source (not shown) to the other air chamber.

A control device 15 is also provided to control the upper actuator 7, lower actuator 10, and retraction device 12 of the wringer roll device 3. The control device 15 is mainly composed of a microcomputer, for example, and is configured to perform calculations using input data and pre-stored data, etc., and output the calculation results as control command signals. Examples of the data input to the control device 15 include the length and thickness of the steel strip 1, the conveying speed, and the stroke amount of each actuator 7, 10, and 14. Examples of the control command signals output from the control device 15 include the supply and stop of air to each actuator 7, 10, and 14.

Figure 3 is a diagram for explaining an example of the operation when the upper roll 4 and the lower roll 5 are pressed against the steel strip 1. In FIG. 3, the steel strip 1 is omitted from the drawing to simplify the drawing. The example shown in FIG. 3 is an example in which each actuator 7, 10, and 14 is a single-acting air cylinder. FIG. 3(A) shows the wringer roll device 3 in the state shown in FIG. 2, where the upper roll 4 is located at an initial position above the pass line PL, and the lower roll 5 is located at an initial position below the pass line PL. In this state, the tip of the steel strip 1 is passed between the upper roll 4 and the lower roll 5 to a certain extent. The gap between the upper roll 4 and the lower roll 5 in the vertical direction H is set to a gap such that the tip of the steel strip 1 is unlikely to come into contact with the outer peripheral surface of the upper roll 4 or the outer peripheral surface of the lower roll 5 when the tip of the steel strip 1 is passed through. The gap can be obtained in advance by experiment.

After the leading end of the steel strip 1 has passed through, air is supplied to the air chamber of the lower actuator 10, causing the piston 10B to rise. This pushes up the steel strip 1, which is in contact with the outer circumferential surface of the lower roll 5. As the piston 10B rises, the lower roll chock 8 rises, and the gap between the frame 9 and the lower roll chock 8 in the vertical direction H gradually increases.

As shown in FIG. 3(B), when the top of the lower roll 5 passes the pass line PL in the vertical direction H, the supply of air to the air chamber of the lower actuator 10 is stopped and this state is maintained. Whether the top of the lower roll 5 has passed the pass line PL can be determined based on the amount of air supplied to the air chamber of the lower actuator 10 or the stroke amount of the piston 10B of the lower actuator 10. Alternatively, the position of the top of the lower roll 5 can be detected by a position sensor (not shown), and whether the top of the lower roll 5 has passed the pass line PL can be determined based on the detection signal of the position sensor.

Next, air is supplied to the air chamber of the retraction actuator 14 to press the slider 13, and the stopper 11 is placed below the lower roll chock 8 as shown in FIG. 3(C). The determination that the stopper 11 has been placed below the lower roll chock 8 can be made based on the amount of air supplied to the air chamber of the retraction actuator 14 and the stroke amount of the piston 14B of the retraction actuator 14. Alternatively, the position of the stopper 11 can be detected by a position sensor (not shown), and the determination that the stopper 11 has been placed below the lower roll chock 8 can be made based on the detection signal of the position sensor.

When the stopper 11 is placed below the lower roll chock 8, air is discharged from the air chamber of the lower actuator 10, and the lower roll 5 gradually descends. As a result, the steel strip 1 in contact with the lower roll 5 and the lower roll chock 8 each descend, until the underside of the lower roll chock 8 comes into contact with the stopper 11. This prevents the lower roll chock 8 from descending any further. In this state, the lower roll chock 8 is supported by the stopper 11. Therefore, the drive of the lower actuator 10 is temporarily stopped.

At approximately the same time as the lowering of the lower roll chock 8 described above, air is supplied to the air chamber of the upper actuator 7, lowering the piston 7B. This causes the upper roll chock 6 and the upper roll 4 to lower. When the upper roll 4 lowers, it is pressed against the steel strip 1 on the lower roll 5, as shown in Figure 3 (D). Note that Figure 4 is a front view showing the state in which the upper roll 4 and the lower roll 5 are pressed against the steel strip 1.

In addition, in the state shown in Figure 3 (D) and Figure 4, in order to maintain the state in which the upper roll 4 and the lower roll 5 are pressed against the steel strip 1, the supply of air to the air chamber of the upper actuator 7 is maintained, or the state in which air is confined in the air chamber is maintained. The amount of air supplied to the air chamber of the upper actuator 7 and the pressure, and the stroke amount of the piston 7B are preset. In other words, the amount of air supplied to the air chamber of the upper actuator 7 and the pressure, and the stroke amount of the piston 7B are the amount of air supplied, pressure, and stroke amount that can remove the treatment liquid when the upper roll 4 and the lower roll 5 are pressed against the steel strip 1. These can be obtained by experiment.

Then, the steel strip 1 is transported by a transport device (not shown), and the steel strip 1 is passed between the upper roll 4 and the lower roll 5 in the state shown in Figure 3 (D) and Figure 4, and the treatment liquid adhering to the surface of the steel strip 1 is removed.

Figure 5 is a diagram for explaining an example of the operation when the upper roll 4 and the lower roll 5 are separated from the steel strip 1. In FIG. 5, the steel strip 1 is omitted in order to simplify the drawing. The example shown in FIG. 5 is an example in which each actuator 7, 10, 14 is a single-acting air cylinder. FIG. 5(A) shows the state in which the upper roll 4 and the lower roll 5 are pressed against the steel strip 1, which is the same state as FIG. 3(D) described above. First, air is discharged from the air chamber of the upper actuator 7. When the pressing force of the piston 7B becomes lower than the elastic force of the return spring, the piston 7B returns to its initial position due to the elastic force of the return spring. Accordingly, the upper roll chock 6 and the upper roll 4 rise and move toward their respective initial positions.

In addition, air is supplied to the air chamber of the lower actuator 10 to press the piston 10B and raise the lower roll chock 8. This pushes up the steel strip 1 in contact with the outer peripheral surface of the lower roll 5, creating a gap between the stopper 11 and the lower roll chock 8. As the lower roll chock 8 rises, the gap between the stopper 11 and the lower roll chock 8 in the vertical direction H, and the gap between the frame 9 and the lower roll chock 8 gradually increase.

As shown in FIG. 5(B), when the top of the lower roll 5 passes the pass line PL in the vertical direction H, the supply of air to the air chamber of the lower actuator 10 is stopped, and this state is maintained. Next, air is discharged from the air chamber of the retraction actuator 14. When the pressing force of the piston 14B becomes lower than the elastic force of the return spring, the piston 14B moves toward its initial position due to the elastic force of the return spring. In this way, the stopper 11 is retracted to the outside of the wringer roll device 3 in the width direction W, and returns to its initial position. FIG. 5(C) and FIG. 2 show this state.

Next, air is discharged from the air chamber of the lower actuator 10. When the pressing force of the piston 10B becomes lower than the elastic force of the return spring, the piston 10B moves toward its initial position due to the elastic force of the return spring. Thus, as shown in FIG. 5(D), the gap between the upper roll 4 and the lower roll 5 in the vertical direction becomes the previously set gap described above.

In this way, in the wringer roll device 3 having the above-mentioned configuration, when the upper roll 4 and the lower roll 5 are pressed against the steel strip 1, the lower roll chock 8 can be supported by the stopper 11 to prevent it from descending. In other words, the lower roll 5 can be fixed. This makes it possible to prevent the lower roll 5 from moving up and down due to the flapping of the steel strip 1. In addition, when the upper roll 4 and the lower roll 5 are pressed against the steel strip 1 to remove the treatment liquid, the upper actuator 7 can press each roll 4, 5 against the steel strip 1. In other words, when the upper roll 4 and the lower roll 5 are pressed against the steel strip 1 to remove the treatment liquid, it is not necessary to drive the lower actuator 10. Therefore, a lower actuator 10 with a small cylinder volume can be used, and the entire device can be simply configured. In addition, when the outer diameter of the lower roll 5 changes before and after the replacement due to the replacement of the lower roll 5, a stopper with a height according to the outer diameter of the lower roll 5 after replacement can be prepared.

Furthermore, in the embodiment of the present invention, since each actuator 7, 10 is configured by an air cylinder, each roll 4, 5 can be opened and closed quickly. Also, the stopper 11 can be quickly positioned below the lower roll chock 8. This can shorten the time required for the wringer roll device 3 to be ready to work, such as passing the steel strip 1 through the wringer roll device 3 or replacing the upper roll 4 and the lower roll 5. Specifically, for example, even if there is no welding machine that connects the steel strips 1 together upstream of the wringer roll device 3 in the conveying direction A of the steel strip 1 and the upper roll 4 and the lower roll 5 are opened and closed every time a new steel strip 1 is passed through, the upper roll 4 and the lower roll 5 can be opened and closed quickly.

In the wringer roll device 3 configured as described above, the operation of each actuator 7, 10, 14 can be controlled by the control device 15. In other words, the opening and closing of the upper roll 4 and the lower roll 5, and the reciprocating movement of the stopper 11 can be performed by remote control by an operator or by automatic control. As a result, safety and line speed can be improved overall.

The present invention is not limited to the above-described embodiment. In the above-described embodiment, the stopper 11 is configured to reciprocate in the width direction W by the retraction device 12, but instead, it may be configured to move in the conveying direction A. Even in this case, the same effects and advantages as those of the above-described embodiment can be obtained.

(Example)
A wringer roll device according to the present invention, which is equipped with the above-mentioned stopper, was prepared, and the wringer roll device was used to squeeze out the rust-preventive oil adhering to the steel strip. Specifically, an upper roll and a lower roll with an outer diameter of 300 mm were used, and the rolls were pressed against a steel strip with a width of 700 mm to 1800 mm to remove the rust-preventive oil adhering to the steel strip. The conveying speed of the steel strip was set to 20 m/min to 120 m/min. Then, the steel strip, the ends of which were welded together, was passed between the upper roll and the lower roll without stopping the wringer roll device. In the wringer roll device according to the present invention, a stopper with a height of 90 mm was placed below the lower roll chock.

Comparative Example
The rust-preventive oil adhering to the steel strip was removed in the same manner as in the Example, except that a wringer roll device not equipped with the above-mentioned stopper was used.

(evaluation)
When the wringer roll device according to the present invention was used, even when the welded portion of the steel strip passed between the upper roll and the lower roll, no damage was caused to the upper roll or the lower roll, and the rust-preventive oil was well removed from the area other than the welded portion. On the other hand, in the wringer roll device of the comparative example, although no damage was observed on the upper roll or the lower roll, there were areas other than the welded portion where the rust-preventive oil was not sufficiently squeezed out. Specifically, the areas where the rust-preventive oil was not sufficiently squeezed out were the areas where the steel strip flapped when passing between the upper roll and the lower roll. The reason why the rust-preventive oil was not sufficiently squeezed out is thought to be that when the steel strip flapped, the lower roll moved up and down and was not able to press the lower roll against the steel strip sufficiently, and therefore the rust-preventive oil was not sufficiently squeezed out. In the wringer roll device of the comparative example, the tension of the steel strip and the load when the steel strip flapped were received only by the air cylinder of the lower roll. Therefore, in the wringer roll device of the comparative example, in order to squeeze out a sufficient amount of rust-preventive oil even when the steel strip flaps, the capacity of the air cylinder of the lower roll must be increased.

REFERENCE SIGNS LIST 1 Steel strip 2 Surface treatment device 3 Wringer roll device 4 Upper roll 5 Lower roll 6 Upper roll chock 7 Upper actuator 8 Lower roll chock 9 Frame 10 Lower actuator 11 Stopper 12 Retraction device 13 Slider 14 Retraction actuator 15 Control device

Claims (4)

the roll conveying device includes an upper roll pressed against an upper surface of a strip that is continuously conveyed, a lower roll pressed against a lower surface of the strip, an upper actuator pressing the upper roll against the upper surface, a lower actuator pressing the lower roll against the lower surface, upper roll chocks that rotatably support both ends of the upper roll and move vertically integrally with the upper roll, and lower roll chocks that rotatably support both ends of the lower roll and move vertically integrally with the lower roll,
a liquid removal device for a web, the liquid being removed from the web by pressing the upper roll and the lower roll against the web by the upper actuator and the lower actuator,
The liquid removal device for a strip further includes a stopper positioned below the lower roll chock to suppress movement of the lower roll chock downward when the liquid adhering to the strip is removed by pressing the upper roll and the lower roll against the strip. The liquid removal device for strips according to claim 1 further comprises a retraction device that disposes the stopper below the lower roll chock and retracts the stopper from below the lower roll chock when the lower actuator is pushing the strip up above the vertical passing position of the strip when the liquid adhering to the strip is being removed by pressing the upper roll and the lower roll against the strip. The liquid removal device for a strip according to claim 2, wherein the retraction device is provided on a fixed part and includes a slider that moves in the axial direction of the lower roll and an actuator that moves the slider in the axial direction, and the stopper is integrally provided on the slider. 2. A method for controlling a liquid removal apparatus according to claim 1, comprising the steps of:
When increasing the gap between the upper roll and the lower roll from a state in which the upper roll and the lower roll are pressed against the strip and the lower roll chock is placed on the stopper, the upper roll and the lower roll are raised above a vertical passing position of the strip when the liquid adhering to the strip is being removed by pressing the upper roll and the lower roll against the strip to remove the stopper from below the lower roll chock, and then the lower roll is lowered below the passing position,
A control method for a liquid removal device in which, when the upper roll and the lower roll are moved closer to each other from a state in which they are separated from each other and pressed against the strip, the lower roll is raised above the passing position to raise the lower roll chock and position the stopper below the lower roll chock, and then the lower roll is lowered to place it on the stopper, and the upper roll is lowered to press the upper roll and the lower roll against the strip.

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