WO2019097711A1 - Cooling device for metal plates and continuous heat treatment equipment for metal plates - Google Patents

Abstract

A cooling device for metal plates, comprising a pair of jetting units provided along the plate width direction, on both sides in the plate thickness direction of the metal plates and interposing the metal plate path line therebetween, said jetting units being for jetting cooling gas towards the metal plates. Each of the jetting units includes: a first nozzle hole row including a plurality of first nozzle holes arranged along the plate width direction of the metal plates; and a second nozzle hole row provided at a position displaced from the first nozzle hole row in conveyance direction of the metal plate and including a plurality of second nozzle holes arranged along the plate width direction of the metal plates. Each of the jetting units has a groove between the first nozzle hole row and the second nozzle hole row, extending along the plate width direction and opening towards the metal plates.

Description

Cooling device for metal plate and continuous heat treatment equipment for metal plate

The present disclosure relates to a cooling device for a metal plate and a continuous heat treatment facility for the metal plate.

It is known to cool a metal plate using a jet of cooling gas (gas jet) in a facility for continuously heat treating a strip-like metal plate.

For example, Patent Document 1 discloses a gas jet cooling device that cools a steel plate by spraying a cooling gas onto the steel plate from a plurality of nozzles provided in pressure headers provided to face both sides of a steel strip. ing. In this gas jet cooling device, the pressure header provided with the plurality of nozzles has a tubular shape extending in the width direction of the steel strip, and the plurality of pressure headers are spaced apart in the lengthwise direction of the steel strip ing. Further, the plurality of nozzles are provided so as to protrude from the pressure header, and are arranged in a staggered manner in the longitudinal direction of the steel strip.

Patent No. 4977878

In the gas jet cooling device described in Patent Document 1, since the pressure headers provided with the plurality of nozzles are arranged at intervals in the longitudinal direction of the steel strip, the gas between the pressure headers in the longitudinal direction of the steel strip A passage is formed. Then, after being jetted from the nozzle, a cooling gas jet whose direction is reversed at the surface of the steel plate becomes a back flow (a backward flow) flowing so as to pass between the headers via this passage.
According to the findings of the present inventors, as described above, in the gas jet device, when there is a back flow that is reversed at the surface of the steel plate and passes backward through the device, the metal plate is easily twisted. I understand. Thus, when the metal plate is twisted, uneven cooling occurs due to the distance between the plate and the nozzle being not uniform in the plate width direction, and the cooling condition (heat treatment condition) of the steel plate is appropriately set. Sometimes it can not be managed.

In view of the above-mentioned circumstances, it is an object of at least one embodiment of the present invention to provide a cooling device for metal sheet and continuous heat treatment equipment capable of suppressing the twist of the metal sheet.

The metal plate cooling device according to at least one embodiment of the present invention is
A pair of ejection units are provided along the width direction of the metal plate on both sides of the metal plate in the thickness direction of the metal plate across the pass line of the metal plate, and for injecting a cooling gas toward the metal plate.
Each said spout unit is
A first nozzle hole row including a plurality of first nozzle holes arranged along a plate width direction of the metal plate;
A second nozzle hole row including a plurality of second nozzle holes arranged at positions shifted in the transport direction of the metal plate with respect to the first nozzle hole row, and arranged along the plate width direction of the metal plate; ,
Including
Each of the jet units has a groove extending along the plate width direction and opening toward the metal plate between the first nozzle hole row and the second nozzle hole row. I assume.

According to at least one embodiment of the present invention, a metal plate cooling device and continuous heat treatment equipment capable of suppressing the metal plate twisting are provided.

It is a schematic block diagram of the continuous heat processing installation of the metal plate concerning one embodiment. It is the model which looked at the cooling device which concerns on one Embodiment in the plate | board thickness direction of a metal plate. FIG. 3 is a view schematically showing a CC cross section of FIG. It is a figure which shows typically the DD cross section of FIG. It is an example of the simulation result by fluid calculation of pressure distribution when a twist arises in a metal plate. It is a schematic diagram which shows the tendency of the magnitude correlation of the pressure by the simulation result of FIG. 5A. It is a figure which shows typically the DD cross section of FIG. It is a schematic diagram which shows the cooling device which concerns on one Embodiment. It is a schematic diagram which shows a typical cooling device. FIG. 9 is a view schematically showing an EE cross section of FIG. 8;

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as the embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, but are merely illustrative. Absent.

First, with reference to FIG. 1, the continuous heat processing installation of the metal plate to which the cooling device 1 which concerns on some embodiment is applied is demonstrated.
FIG. 1: is a schematic block diagram of the continuous heat processing installation of the metal plate which concerns on one Embodiment. As shown in FIG. 1, the continuous heat treatment facility 100 includes a furnace (not shown) for continuously heat treating the strip-like metal plate 2 (for example, a steel plate), and rolls 6A and 6B for conveying the metal plate 2. And the cooling device 1 for cooling the metal plate 2 heat-treated by the above-mentioned furnace. Arrows in FIG. 1 indicate the transport direction (moving direction) of the metal plate 2.

As shown in FIG. 1, the roll 6A and the roll 6B are vertically separated from each other, and between the roll 6A and the roll 6B, the metal plate 2 is in the vertical direction (in the example shown in FIG. Toward the transport). A pair of guide rolls 8A and 8B are provided between the roll 6A and the roll 6B so as to sandwich the metal plate 2, thereby suppressing the bending and twisting of the metal plate 2 .

Cooling device 1 includes a pair of jet units 10A and 10B provided on both sides of metal plate 2 in the thickness direction of sandwiching pass line 3 of metal plate 2. The pair of ejection units 10A and 10B are configured to eject the cooling gas toward the metal plate 2.
Thus, the metal plate 2 can be effectively cooled by blowing a cooling gas (for example, air) from the pair of jet units 10A, 10B toward both surfaces of the metal plate 2.

The continuous heat treatment facility 100 may be a continuous annealing furnace for continuously annealing the metal plate 2 by cooling the metal plate 2 by the cooling device 1 after heating the metal plate 2 by the above-described furnace .

Hereinafter, the cooling device 1 according to some embodiments will be described in more detail.
FIG. 2 is a schematic view of the cooling device 1 according to one embodiment viewed in the thickness direction of the metal plate 2, more specifically, in the thickness direction of the metal plate 2, a pair of ejection units of the cooling device 1 It is the figure which looked at the ejection unit 10A which is one of 10A and 10B from the other ejection unit 10B. FIG. 3 is a view schematically showing a CC cross section of FIG. 2, and FIG. 4 is a view schematically showing a DD cross section of FIG. 6 is also a view schematically showing a cross section taken along the line DD in FIG. 3 as in FIG.
Arrows in FIGS. 3 and 4 indicate the flow direction of the cooling gas ejected from the ejection units 10A and 10B.

As shown in FIGS. 1 to 4, the jet units 10A and 10B of the cooling device 1 extend in the plate width direction of the metal plate 2 on both sides in the plate thickness direction of the metal plate 2 across the pass line 3 of the metal plate 2. Is provided.

Each of the jet units 10A and 10B includes a header portion 12 configured to be supplied with a high-pressure cooling gas, and a nozzle portion provided on the header portion 12 so as to extend along the plate width direction. .
In the cooling device 1 shown in FIGS. 2 to 4, the header portion 12 has a box-like shape, and a plurality of header portions 12 are arranged along the transport direction of the metal plate 2. Further, each of the plurality of header portions 12 is provided with a plurality of nozzle holes 14 arranged in the plate width direction as the above-mentioned nozzle portion, and the nozzle holes 14 and the header portion 12 communicate with each other. . The high-pressure cooling gas supplied to the header portion is jetted toward the metal plate 2 through the plurality of nozzle holes 14.
Moreover, the header part 12 may be divided in the board width direction, and plural pieces may be arranged.

As shown in FIG. 2, the plurality of nozzle holes 14 are a plurality of nozzle holes 14A provided in the first header portion 12A which is one of a pair of header portions adjacent in the transport direction, and a second one which is the other. And a plurality of nozzle holes 14B provided in the header portion 12B.
The plurality of nozzle holes 14A and the plurality of nozzle holes 14B respectively form a first nozzle hole row 15A and a second nozzle hole row 15B extending along the plate width direction. The first nozzle hole row 15 </ b> A and the second nozzle hole row 15 </ b> B are offset in the conveyance direction of the metal plate 2.
Then, in each of the pair of ejection units 10A and 10B, the first nozzle hole row 15A and the second nozzle hole row 15B extend along the plate width direction and toward the metal plate 2 An open groove 40 is formed. The groove 40 has a bottom located farther from the metal plate 2 than the nozzle holes 14A and 14B in the plate width direction. That is, the flow of gas jetted from the nozzle holes 14A and 14B and reversed by the metal plate 2 in the direction away from the metal plate 2 is stopped at the bottom of the groove 40. However, as long as backflow does not occur, there is no problem even if a hole or a gap is present at the bottom of the groove 40. Also in this case, the bottom represents the state in which the groove 40 is closed.

In some embodiments, the groove 40 formed between the first nozzle hole row 15A and the second nozzle hole row 15B is formed by the side wall surfaces of the adjacent header portions 12A and 12B and the groove forming portion 5. It may be formed.
In the embodiment shown in FIGS. 2 to 4, assuming that the surface on the side where the plurality of header portions 12 (12A or 12B) face the metal plate 2 is the front, the groove forming portion 5 described above is a back surface of the plurality of header portions 12 The back plate 32 provided on the That is, the back plate 32 is provided on the side opposite to the metal plate 2 in the plate thickness direction, and is provided to connect the plurality of header portions 12.
In this case, the groove 40 has a pair of side surfaces respectively formed by the wall surfaces of the adjacent header portions 12 and a bottom formed by the surface of the back plate 32 located farther from the metal plate 2 than the nozzle holes 14A and 14B. And.

Here, FIGS. 8 and 9 are schematic views showing a typical cooling device 1, and are schematic views of cross sections corresponding to FIG. 2 and FIG. 3, respectively. FIG. 9 is a view schematically showing the EE cross section of FIG.
The cooling device 1 shown in FIGS. 8 and 9 basically has the same configuration as that of the cooling device 1 according to the embodiment shown in FIGS. 2 to 4, but the first nozzle hole row 15A is positioned offset in the transport direction. And the second nozzle hole row 15B, the groove 40 is not formed, but the passage 42 is formed.
That is, in the cooling device 1 shown in FIGS. 8 and 9, the members corresponding to the groove forming portion 5 in FIGS. 2 to 4 are not provided, and the first header portion 12A and the second header portion adjacent in the transport direction A passage 42 is formed between the header portions 12 in a direction orthogonal to the transport direction between the header portions 12 and 12B.

Thus, in the case where the passage 42 is formed between the first nozzle hole row 15A and the second nozzle hole row 15B in the transport direction (longitudinal direction) of the metal plate 2, the nozzle hole 14 faces the metal plate 2 A part of the discharged cooling gas is reversed in direction on the surface of the metal plate 2 and becomes a back flow 44 (see FIG. 9) passing through the above-mentioned passage 42. According to the findings of the present inventors, when there is such a backflow 44 of the cooling gas, when the metal plate 2 is twisted for some reason, a moment (torque return moment) for reducing the twist amount It has been found that in some cases the metal plate 2 can not be cooled uniformly in the plate width direction without being able to suppress the deflection of the metal plate 2.

In this respect, in the above-described embodiment, in each of the pair of ejection units 10A and 10B, the first nozzle hole row 15A and the second nozzle hole row 15B extend in the plate width direction in the transport direction of the metal plate 2. The existing groove 40 is formed, and the passage 42 (see FIG. 9) through which the back flow 44 of the cooling gas jet whose direction is reversed by the metal plate 2 passes is not formed. Therefore, the cooling gas jetted from the first nozzle holes 14A and the second nozzle holes 14B toward the metal plate 2 and turned at the surface of the metal plate 2 flows into the grooves 40 and then flows in the plate width direction. Since the pressure is discharged along the grooves 40 in the plate width direction, the static pressure is high in the region between the grooves 40 and the metal plate 2. (Refer to FIG. 4, FIG. 5A and FIG. 5B) In such a flow field, as shown in FIG. 5, the metal plate 2 and the jet units 10A, 10B are twisted by the twisting of the metal plate 2 in the area within the width of the metal plate 2. When the space between them narrows, the discharge of the cooling gas in the plate width direction is hindered, and the pressure in the narrower space becomes high. That is, since a moment (torsion return moment) in the direction in which the metal plate 2 is untwisted is generated, the twist of the metal plate 2 can be suppressed. Therefore, according to the above-mentioned embodiment, the twist of metal plate 2 can be suppressed and metal plate 2 can be uniformly cooled to the board width direction.

In FIG. 5A, in the cooling device 1 according to the embodiment shown in FIG. 2 to FIG. 4, the fluid calculation of the pressure distribution in the plane including the plate width direction and the plate thickness direction when the metal plate 2 is twisted. FIG. 5B is a schematic view showing the tendency of the magnitude relation of the pressure by the simulation result in the same plane as FIG. 5A. In FIGS. 5A and 5B, straight lines (broken lines) respectively extending in the plate width direction and the plate thickness direction are straight lines passing through the center of the metal plate 2.
As shown in FIG. 5A, on both sides of the metal plate 2 in the thickness direction, at least most of the regions A ₁₂ and A ₂₂ where the pressure is the highest is the space narrowed by twisting of the metal plate 2 (ie 5A, the upper right region and the lower left region in FIG. 5B). Further, as shown in FIG. 5A, in the region narrowed by torsion of the metal plate 2, the spacing of the isobar is relatively narrow (see a portion indicated by A ₁₃ and A ₂₁ in FIG. 5A), the plate width direction The pressure largely increases from the end of the metal plate 2 to the center thereof, and it can be seen that the pressure is high in a wide range. In contrast, in a region widened by torsion of the metal plate 2, the spacing of the isobar is relatively large (see a portion indicated by A ₁₁ and A ₂₃ in FIG. 5A), the metal plate 2 in the plate width direction The pressure rise gradient is relatively small from the end to the center, and the range of high pressure is relatively narrow.
Therefore, as shown in FIG. 5B, the pressure is relatively high in the space narrowed by the twisting of the metal plate 2 (the upper right and lower left regions in FIGS. 5A and 5B), and the twisting of the metal plate 2 is wide. It can be seen that the pressure tends to be relatively low in the space (upper left and lower right regions in FIGS. 5A and 5B).

Further, according to the findings of the present inventors, as shown in FIG. 6, in both sides of the metal plate 2 in the plate width direction, the high pressure portion A4 may be generated due to the collision of the gas jet from the opposing nozzle holes 14. The high pressure portion A4 contributes to an increase in the twist of the metal plate 2. That is, when the high pressure portion A4 described above is generated, if the metal plate 2 is twisted for some reason, a pressure difference is generated on both surfaces of the metal plate 2 due to the high pressure portion A4, thereby increasing the amount of twisting. The moment (torsion moment) acts on the metal plate 2 and the metal plate 2 shakes, so the metal plate 2 may not be cooled uniformly in the plate width direction.

In this respect, in the above-described embodiment, the pair of jet units 10A and 10B extend along the plate width direction between the first nozzle hole row 15A and the second nozzle hole row 15B, respectively, and the metal plate And a groove 40 opening toward 2. Therefore, a part of the cooling gas ejected from the first nozzle hole 14A and the second nozzle hole 14B is diverted at the surface of the metal plate 2, and then flows in the plate width direction through the above-mentioned groove 40, Since the fluid is discharged to the outside in the width direction, the pressure of the high pressure part A4 (see FIG. 6) which can be generated on the outside of the metal plate 2 in the plate width direction is reduced. Therefore, since it is hard to produce the moment of the direction which makes the amount of twists of metal plate 2 increase, the twist of metal plate 2 can be controlled.

FIG. 7 is a schematic view showing the cooling device 1 according to one embodiment, and is a schematic view of a cross section corresponding to FIG. The cooling device 1 shown in FIG. 7 includes the jet units 10A and 10B according to the embodiment described above with reference to FIGS. 1 to 4 and is further provided in the groove 40 to adjust the depth d of the groove 40 And a groove depth adjustment unit 34 for the purpose.

The groove depth adjustment unit 34 shown in FIG. 7 is a movable member provided movable in the thickness direction with respect to each of the pair of ejection units 10A and 10B. At least a part of the movable member (the groove depth adjusting portion 34) is provided so as to be sandwiched between the pair of header portions 12A and 12B adjacent in the transport direction. The depth d of the groove 40 can be adjusted by moving the gap in the plate thickness direction.

According to the knowledge of the present inventors, as the depth d of the groove 40 extending along the sheet width direction is shallow, the above-mentioned untwisting moment tends to be larger. In this respect, according to the embodiment including the groove depth adjusting portion 34 described above, since the depth d of the groove extending along the plate width direction can be adjusted by the groove depth adjusting portion 34, the metal plate 2 Adjusting the depth d of the groove 40 according to the characteristics (plate thickness etc.) of the metal plate 2 to cause the metal plate 2 to exert an appropriate twisting return moment to appropriately suppress the twist of the metal plate 2 it can.
Further, according to the findings of the present inventors, as the depth d of the above-mentioned groove 40 is deeper, the amount of gas whose temperature has risen due to collision with the metal plate 2 tends to be increased through the groove. As a result, the amount of gas that has collided with the metal plate 2 flows along the metal plate 2 to the end of the plate as it is, so that the metal plate 2 can be easily cooled uniformly. In this respect, according to the embodiment including the groove depth adjusting portion 34 described above, since the depth d of the groove 40 extending along the plate width direction can be adjusted by the groove depth adjusting portion 34, the metal plate By adjusting the depth d of the groove 40 according to the characteristics (plate thickness and the like) of 2, it is possible to achieve both suppression of the twist of the metal plate 2 and uniform cooling of the metal plate 2.

In another embodiment, the groove depth adjusting portion 34 is fixed to the inside of the groove 40, and the depth of the groove 40 can be adjusted by the size and the number of the groove depth adjusting portions 34 themselves. It may be For example, a shim may be used as such a groove depth adjustment unit 34.

In some embodiments, the groove depth adjuster 34 may be configured to adjust the depth of the groove 40 according to the plate width of the metal plate 2.

Although not particularly illustrated, for example, the cooling device 1 detects the position of the groove depth adjustment unit 34 based on the edge sensor for detecting the position of the edge of the metal plate 2 and the detection result obtained by the edge sensor. And, a controller configured to adjust to adjust the depth d of the groove 40.

In the continuous processing apparatus which processes a metal plate continuously, the plate | board width of the metal plate of a process target may be changed during driving | operation. Further, depending on the width of the metal plate 2, the depth of the groove 40 for appropriately cooling the metal plate 2 by the cooling device 1 may be different.
In this respect, by appropriately adjusting the depth of the groove in accordance with the width of the metal plate 2 as described above, the torsion of the metal plate 2 is properly adjusted even when the width of the metal plate 2 changes. And the metal plate 2 can be properly cooled.

In some embodiments, each jetting unit 10A, 10B includes three or more nozzle hole rows 15 including a first nozzle hole row 15A and a second nozzle hole row 15B, and the three or more nozzle holes in the transport direction The two or more grooves 40 alternately arranged with the row 15 may include a first groove and a second groove having a depth different from that of the first groove.
In other words, in each ejection unit 10A, 10B, even if the plurality of nozzle hole rows 15 extending in the plate width direction and the plurality of grooves 40 extending in the plate width direction are alternately arranged in the transport direction At this time, at least one of the plurality of grooves 40 may have a depth d different from that of the other grooves 40.

As described above, the smaller the depth d of the groove 40 extending along the sheet width direction, the larger the above-mentioned untwisting moment tends to be. Moreover, since the flow velocity of the cooling gas which flows through a groove | channel becomes low, so that the depth d of the above-mentioned groove | channel 40 is deep, it is easy to cool the metal plate 2 uniformly.
In this respect, in the above-described embodiment, the plurality of grooves 40 including the first groove and the second groove are arranged in the conveyance direction of the metal plate 2, and the grooves 40 corresponding to the positions of the grooves 40 are arranged. It is possible to change the depth of Therefore, depending on the position of each groove 40 in the transport direction, the desired function of the application of a twisting return moment to metal plate 2 to each groove 40 or the uniform cooling of metal plate 2 is mainly performed. You can have it. Thereby, coexistence of suppression of the twist of the metal plate 2 and uniform cooling of the metal plate 2 is attained over the range of the conveyance direction of the metal plate 2 in which the several groove | channel 40 is arrange | positioned.

In some embodiments, the depth of the grooves 40 may have a distribution in the plate width direction. For example, the central portion in the sheet width direction may be configured to be deep and shallow toward both ends, and conversely, the central portion may be configured to be shallow and deeper toward both ends.

In this case, the depth d of the groove 40 extending along the sheet width direction has a distribution in the sheet width direction by setting an appropriate depth according to the position in the sheet width direction. Depending on the position in the width direction, a desired function can be mainly provided among the application of the twisting return moment to the metal plate 2 or the uniform cooling of the metal plate 2. Thereby, it is easy to adjust the balance between the suppression of the twist of the metal plate 2 and the uniform cooling of the metal plate 2.

Hereinafter, the outline | summary is described about the cooling device and continuous heat processing installation of the metal plate which concern on some embodiment.

(1) A cooling device for a metal plate according to at least one embodiment of the present invention,
A pair of ejection units are provided along the width direction of the metal plate on both sides of the metal plate in the thickness direction of the metal plate across the pass line of the metal plate, and for injecting a cooling gas toward the metal plate.
Each said spout unit is
A first nozzle hole row including a plurality of first nozzle holes arranged along the plate width direction of the metal plate;
A second nozzle hole row including a plurality of second nozzle holes arranged at positions shifted in the conveyance direction of the metal plate with respect to the first nozzle hole row, and arranged along the plate width direction of the metal plate When,
Including
Each of the jet units has a groove extending along the plate width direction and opening toward the metal plate between the first nozzle hole row and the second nozzle hole row. I assume.

In the configuration of the above (1), in each ejection unit, a groove extending in the plate width direction is formed between the first nozzle hole row and the second nozzle hole row in the transport direction of the metal plate. A passage is not formed through which the back flow of the cooling gas jet whose direction is reversed by the metal plate.
Therefore, the cooling gas jetted from the first and second nozzles toward the metal plate and diverted at the surface of the metal plate flows into the groove and then changes its flow in the plate width direction to form a plate along the groove The discharge in the width direction increases the static pressure in the region between the groove and the metal plate. In such a flow field, when the space between the metal plate and the ejection unit is narrowed due to the twisting of the metal plate in the area within the width of the metal plate, the cooling gas discharge in the plate width direction is hindered and the space is narrowed The pressure in the other space is high, and a moment in the direction to return the metal plate to twist (a twist return moment) is generated, so that the twist of the metal plate can be suppressed. Therefore, according to the structure of said (1), the twist of a metal plate can be suppressed and a metal plate can be cooled uniformly with respect to the board width direction.

Further, in the configuration of the above (1), the pair of jet units extends along the plate width direction between the first nozzle hole row and the second nozzle hole row, and opens toward the metal plate. Have grooves. Therefore, a part of the cooling gas jetted from the first nozzle hole and the second nozzle hole is diverted at the surface of the metal plate, and then flows in the plate width direction through the above-mentioned groove, to the outside in the plate width direction. Because the fluid is discharged, the pressure in the high pressure part that can be generated outside the metal plate in the plate width direction is reduced. Therefore, since it is hard to produce the moment of the direction which makes the amount of twists of a metal plate increase, the twist of a metal plate can be controlled.

(2) In some embodiments, in the configuration of (1) above,
Each said spout unit is
A first header portion extending along the plate width direction and in communication with the plurality of first nozzle holes;
A second header portion extending along the plate width direction on the side opposite to the first header portion across the groove in the transport direction, and in communication with the plurality of second nozzle holes;
including.

According to the configuration of the above (2), the first header portion extending along the plate width direction in the conveyance direction of the metal plate and communicating with the plurality of first nozzle holes, and extending along the plate width direction Since the groove along the plate width direction is formed between the second header portion communicating with the plurality of second nozzle holes, the configuration of (1) can be realized with a simple configuration. Thereby, the twist of a metal plate can be suppressed and a metal plate can be uniformly cooled with respect to the plate width direction.

(3) In some embodiments, in the configuration of (1) or (2) above,
The cooling device for the metal plate is
A groove depth adjustment unit is provided in the groove and for adjusting the depth of the groove.

According to the knowledge of the present inventors, as the depth of the groove extending along the sheet width direction is shallow, the above-mentioned untwisting moment tends to be larger. In this respect, according to the configuration of the above (3), since the depth of the groove extending along the plate width direction can be adjusted by the groove depth adjusting portion, the characteristics (plate thickness and the like) of the metal plate Thus, by adjusting the depth of the groove, an appropriate unscrewing moment can be applied to the metal plate to appropriately suppress the twist of the metal plate.
Further, according to the findings of the present inventors, the deeper the groove is, the lower the flow velocity of the cooling gas flowing in the groove is, so the metal plate is easily cooled uniformly. In this respect, according to the configuration of the above (3), since the depth of the groove extending along the plate width direction can be adjusted by the groove depth adjusting portion, the characteristics (plate thickness and the like) of the metal plate By adjusting the depth of the groove, it is possible to achieve both suppression of the twist of the metal plate and uniform cooling of the metal plate.

(4) In some embodiments, in the configuration of (3) above,
The groove depth adjusting portion is provided movably in the plate thickness direction with respect to each of the ejection units.

According to the structure of said (4), the depth of a groove is adjustable by moving a groove depth adjustment part with respect to each jet unit in the plate | board thickness direction.

(5) In some embodiments, in the configuration of (3) or (4) above,
The groove depth adjusting unit is configured to adjust the depth of the groove in accordance with the width of the metal plate.

According to the configuration of the above (5), by appropriately adjusting the depth of the groove in accordance with the width of the metal plate, even if the width of the metal plate changes, it is possible to properly twist the metal plate. And the metal plate can be properly cooled.

(6) In some embodiments, in any of the configurations (1) to (5),
Each of the jetting units includes three or more nozzle hole rows including the first nozzle hole row and the second nozzle hole row,
The two or more grooves arranged alternately with the three or more nozzle hole rows in the transport direction are:
The first groove,
A second groove having a depth different from that of the first groove;
including.

As described above, the smaller the depth of the groove extending along the sheet width direction, the larger the above-mentioned untwisting moment tends to be. Moreover, since the flow velocity of the cooling gas which flows through a groove | channel becomes low, so that the depth of the above-mentioned groove | channel is deep, it is easy to cool a metal plate uniformly.
In this respect, in the configuration of the above (6), a plurality of grooves including the first groove and the second groove are arranged in the conveying direction of the metal plate, and the depth of the grooves in these grooves in accordance with the position in the conveying direction. It is possible to change Therefore, depending on the position of each groove in the transport direction, the desired function can be mainly given to each groove among the application of a twisting return moment to the metal plate or the uniform cooling of the metal plate. it can. Thereby, coexistence of suppression of a twist of a metal plate, and uniform cooling of a metal plate is attained over the range of the conveyance direction of the metal plate in which a plurality of slots are arranged.

(7) In some embodiments, in any of the configurations of (1) to (6) above,
The depths of the grooves have a distribution in the plate width direction.

According to the configuration of the above (7), since the depth of the groove extending along the width direction has a distribution in the width direction, in the groove, an appropriate depth corresponding to the position in the width direction is set. By setting, depending on the position of the groove in the plate width direction, a desired function can be mainly provided among the application of the twisting return moment to the metal plate or the uniform cooling of the metal plate. This makes it easy to adjust the balance between suppression of metal plate twisting and uniform cooling of the metal plate.

(8) In some embodiments, in any of the configurations (1) to (7),
Each of the ejection units is disposed outside the plate width direction with respect to the central portion when the cooling gas is ejected from the central portion in the plate width direction in the region capable of ejecting the cooling gas in the plate width direction. It is configured to be able to stop the discharge of the cooling gas from the end of the fusible region located.

According to the configuration of the above (8), when the cooling gas is jetted from the central portion in the plate width direction among the jettable regions in the plate width direction of each of the pair of jetting units, the plate width direction with respect to the central portion It is possible to stop the discharge of the cooling gas from the end located on the outside of the. The central portion refers to a region in the plate width direction of the jet unit corresponding to the plate width of the metal plate. As a result, the high pressure portion due to the collision of the gas jet is less likely to be generated on both sides of the metal plate in the plate width direction, and the moment for increasing the twist amount of the metal plate is reduced. . In addition, since high pressure portions are unlikely to be produced on both sides of the metal plate in the plate width direction, the flow of gas jets colliding with the metal plate to the outside in the plate width direction is less likely to be blocked by the high pressure portions. As a result, in the area within the width of the metal plate, the pressure in the narrower space is increased by the twisting of the metal plate, and a moment in the direction of reducing the twist of the metal plate (twisting moment) tends to be generated. , Can suppress the twist of the metal plate. Therefore, according to the structure of said (8), the twist of a metal plate can be suppressed and a metal plate can be cooled appropriately.

(9) A continuous heat treatment facility for a metal plate according to at least one embodiment of the present invention,
A furnace for heat treating the metal plate,
The cooling device according to any one of (1) to (8), which is configured to cool the heat-treated metal plate in the furnace.
Equipped with

In the configuration of the above (9), in each ejection unit, a groove extending in the plate width direction is formed between the first nozzle hole row and the second nozzle hole row in the transport direction of the metal plate. A passage is not formed through which the back flow of the cooling gas jet whose direction is reversed by the metal plate. Therefore, the cooling gas jetted from the first and second nozzles toward the metal plate and diverted at the surface of the metal plate flows into the groove and then changes its flow in the plate width direction to form a plate along the groove The discharge in the width direction increases the static pressure in the region between the groove and the metal plate. In such a flow field, when the space between the metal plate and the ejection unit is narrowed due to the twisting of the metal plate in the area within the width of the metal plate, the cooling gas discharge in the plate width direction is hindered and the space is narrowed The pressure in the other space is high, and a moment in the direction to return the metal plate to twist (a twist return moment) is generated, so that the twist of the metal plate can be suppressed. Therefore, according to the structure of said (9), the twist of a metal plate can be suppressed and a metal plate can be cooled appropriately.

Further, in the configuration of the above (9), the pair of jet units respectively extend along the plate width direction between the first nozzle hole row and the second nozzle hole row and head toward the metal plate. Has an open groove. Therefore, a part of the cooling gas jetted from the first nozzle hole and the second nozzle hole is diverted at the surface of the metal plate, and then flows in the plate width direction through the above-mentioned groove, to the outside in the plate width direction. Because the fluid is discharged, the pressure in the high pressure part that can be generated outside the metal plate in the plate width direction is reduced. Therefore, since it is hard to produce the moment of the direction which makes the amount of twists of a metal plate increase, the twist of a metal plate can be controlled.

As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, The form which added deformation | transformation to embodiment mentioned above, and the form which combined these forms suitably are also included.

In the present specification, a representation representing a relative or absolute arrangement such as "in a direction", "along a direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" Not only represents such an arrangement strictly, but also represents a state of relative displacement with an tolerance or an angle or distance that can obtain the same function.
For example, expressions that indicate that things such as "identical", "equal" and "homogeneous" are equal states not only represent strictly equal states, but also have tolerances or differences with which the same function can be obtained. It also represents the existing state.
Furthermore, in the present specification, expressions representing shapes such as a square shape and a cylindrical shape not only indicate shapes such as a square shape and a cylindrical shape in a geometrically strict sense, but also within the range where the same effect can be obtained. Also, the shape including the uneven portion, the chamfered portion, and the like shall be indicated.
Moreover, in the present specification, the expressions “comprising”, “including” or “having” one component are not exclusive expressions excluding the presence of other components.

Reference Signs List 1 cooling device 2 metal plate 3 pass line 5 groove forming portion 6A roll 6B roll 8A guide roll 8B guide roll 10A ejection unit 10B ejection unit 12 header portion 12A first header portion 12B second header portion 14 nozzle hole 14A first nozzle hole 14B second nozzle hole 15 nozzle hole row 15A first nozzle hole row 15B second nozzle hole row 32 back plate 34 groove depth adjustment portion 40 groove 42 passage 44 back flow 100 continuous heat treatment facility A2 space A4 high pressure portion

Claims (9)

A pair of ejection units are provided along the width direction of the metal plate on both sides of the metal plate in the thickness direction of the metal plate across the pass line of the metal plate, and for injecting a cooling gas toward the metal plate.
Each said spout unit is
A first nozzle hole row including a plurality of first nozzle holes arranged along the plate width direction of the metal plate;
A second nozzle hole row including a plurality of second nozzle holes arranged at positions shifted in the conveyance direction of the metal plate with respect to the first nozzle hole row, and arranged along the plate width direction of the metal plate When,
Including
Each of the jet units has a groove extending along the plate width direction and opening toward the metal plate between the first nozzle hole row and the second nozzle hole row. A cooling system for metal plates. Each said spout unit is
A first header portion extending along the plate width direction and in communication with the plurality of first nozzle holes;
A second header portion extending along the plate width direction on the side opposite to the first header portion across the groove in the transport direction, and in communication with the plurality of second nozzle holes;
The metal plate cooling device according to claim 1, further comprising: The cooling device for a metal plate according to claim 1 or 2, further comprising: a groove depth adjusting portion provided in the groove and adjusting a depth of the groove. The metal groove cooling apparatus according to claim 3, wherein the groove depth adjusting portion is provided movably in the plate thickness direction with respect to each of the jet units. The said groove depth adjustment part was comprised so that the depth of the said groove could be adjusted according to the plate | board width | variety of the said metal plate, The cooling device of the metal plate of Claim 3 or 4 characterized by the above-mentioned. Each of the jetting units includes three or more nozzle hole rows including the first nozzle hole row and the second nozzle hole row,
The two or more grooves arranged alternately with the three or more nozzle hole rows in the transport direction are:
The first groove,
A second groove having a depth different from that of the first groove;
The cooling device of the metal plate as described in any one of the Claims 1 thru | or 5 characterized by including. The metal plate cooling device according to any one of claims 1 to 6, wherein the depths of the grooves have a distribution in the plate width direction. Each of the ejection units is disposed outside the plate width direction with respect to the central portion when the cooling gas is ejected from the central portion in the plate width direction in the region capable of ejecting the cooling gas in the plate width direction. The metal plate cooling apparatus according to any one of claims 1 to 7, wherein the cooling gas is configured to be able to stop being jetted out of the end of the jettable area located. A furnace for heat treating the metal plate,
The cooling device according to any one of claims 1 to 8, configured to cool the heat-treated metal plate in the furnace.
Continuous heat treatment equipment of a metal plate characterized by having.

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