JP2019094519A - Cooling system of metal plate and continuous heat treatment device of metal plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling device for a metal plate capable of suppressing twisting of the metal plate and a continuous heat treatment facility for the metal plate. SOLUTION: A metal plate cooling device is provided on both sides of the metal plate in the plate thickness direction with a pass line of the metal plate in between along the plate width direction of the metal plate, and cooling gas is directed toward the metal plate. Each of the ejection units includes a pair of ejection units for ejecting the cooling gas, and each of the ejection units is centered when the cooling gas is ejected from the central portion in the plate width direction in the area where the cooling gas can be ejected in the plate width direction. It is configured to be able to stop the ejection of the cooling gas from the end portion of the ejection possible region located outside the plate width direction with respect to the portion. [Selection diagram] Fig. 4

Description

  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 stream (gas jet) of a cooling gas in a facility for continuously heat treating a strip-like metal plate.

  For example, Patent Document 1 includes a window box arranged to face a steel plate to be transported, and a gas jet cooling system that cools the steel plate by spraying a cooling gas onto the steel plate from a plurality of nozzles provided in the window box. An apparatus is disclosed. In this gas jet cooling device, the inside of the windbox is divided into a plurality of chambers aligned in the sheet width direction by a partition plate provided along the sheet passing direction, for the purpose of cooling the steel plate more uniformly. The flow rate of the cooling gas sprayed from each chamber to the steel plate is adjusted. More specifically, the flow rate of the cooling gas from the nozzles provided in the chambers at both ends is made smaller than the nozzle provided in the chamber at the central portion in the plate width direction of the windbox among the chambers of the windbox. It is supposed to be.

JP, 2000-297331, A

  By the way, according to the knowledge of the present inventors, it has been found that the metal plate may be twisted when passing through the gas jet nozzle, and the amount of twist can be increased by the cooling gas jet from the nozzle. Thus, if the twist amount of the metal plate increases when passing through the nozzle, 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 of the steel plate (heat treatment condition ) May not be properly 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 a metal plate capable of suppressing the twist of the metal plate and a continuous heat treatment equipment for the metal plate.

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 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 characterized in that it is configured to be able to stop the discharge of the cooling gas from the end of the fusible region located.

  According to at least one embodiment of the present invention, a cooling device for a metal plate capable of suppressing the twist of the metal plate and a continuous heat treatment facility for the metal plate 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. It is a figure which shows typically the AA cross section of FIG. It is a figure which shows the BB cross section of FIG. 3 typically. It is a schematic diagram which shows the cooling device 1 which concerns on one Embodiment. FIG. 1 is a schematic view showing a typical cooling device 1;

  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 an A-A cross section of FIG. 2, and FIG. 4 is a view schematically showing an B-B cross section of FIG. 3.
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 the 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-described nozzle portion. The high-pressure cooling gas supplied to the header portion is jetted toward the metal plate 2 through the plurality of nozzle holes 14.
Although the illustrated nozzle holes 14 have a circular shape, the shape of the nozzle holes 14 is not limited to a circular shape. The nozzle hole 14 may have, for example, a shape such as an oval or a polygon.

  In some other embodiments, the nozzle unit of the jet units 10A and 10B may include a slit whose opening serving as the discharge port extends in the plate width direction.

Here, it is possible to eject the cooling gas in the region in the plate width direction in which the nozzle portion extends in the ejection units 10A and 10B. That is, the area | region of the board width direction which a nozzle part extends among ejection unit 10A, 10B is the ejection possible area RA of ejection unit 10A, 10B.
As in the embodiment shown in FIGS. 2 to 4, when the nozzle portion is formed by the plurality of nozzle holes 14 arranged in the plate width direction, it is arranged at both ends in the plate width direction among the plurality of nozzle holes 14. The area in the plate width direction sandwiched by the nozzle holes 14 is the above-described jettable area RA (see FIG. 2 or FIG. 4).

In some embodiments, each of the ejection units 10A and 10B is a part of the dischargeable area RA of the cooling gas in the plate width direction when the cooling gas is discharged from the central part R1 in the plate width direction with respect to the central part R1. The jet of cooling gas from the end R2 of the jettable region located outside in the plate width direction can be stopped.
For example, in the embodiment shown in FIG. 4, the jet units 10A and 10B are configured to receive the cooling gas from the nozzle holes 14 located in the range of the central portion R1 in the plate width direction among the jettable area RA of the cooling gas in the plate width direction. The nozzle hole 14 located in the range of the end portion R2 is configured to be able to stop the ejection of the cooling gas when ejecting the nozzle.

Here, FIG. 6 is a schematic view showing a typical cooling device 1, and is a schematic view of a cross section corresponding to FIG.
The cooling device 1 shown in FIG. 6 basically has the same configuration as that of the cooling device 1 according to the embodiment shown in FIGS. 2 to 4, but all of the jettable areas RA in the plate width direction of the jet units 10A and 10B. Cooling gas is ejected from the area. That is, in the cooling device 1 shown in FIG. 6, the cooling gas is ejected from all the nozzle holes 14 provided in the header portion 12, and the ejection of the cooling gas is not stopped in any plate width direction area. There is.

According to the knowledge of the present inventors, as in the cooling device 1 shown in FIG. 6, when the cooling gas is ejected from the entire area of the jettable area RA in the sheet width direction, both sides of the metal plate 2 in the sheet width direction. On the other hand, the high pressure part A1 (see FIG. 6) is generated by the collision of the gas jets from the opposing nozzle holes 14 (nozzle part). At this time, when the metal plate 2 is twisted for some reason, a pressure difference is generated on both sides of the metal plate 2 due to the high pressure portion A1.
That is, as shown in FIG. 6, in a state where high voltage parts A1 are formed on both sides of metal plate 2, twisting of metal plate 2 for some reason causes one surface of metal plate 2 at the end of metal plate 2. While the gas jet from the nozzle hole 14 is confined within the range of the plate width of the metal plate 2 by the high pressure portion A1 on the side (the portion shown by the numeral 101), the other surface side of the metal plate 2 (the portion shown by 102) In this case, the gas jet from the nozzle hole 14 flows out of the range of the plate width of the metal plate 2 because the movement is not blocked by the high pressure portion A1. As a result, a pressure difference is generated on both surfaces of the metal plate 2, and a moment MF (torsion moment) in the direction to further increase the twist amount acts on the metal plate 2 due to the pressure difference.
In this case, since the metal plate 2 shakes due to the twisting moment, the metal plate 2 may not be uniformly cooled in the plate width direction.

In this respect, in the above-described embodiment, the central portion R1 of the jettable areas RA in the plate width direction of each of the pair of jet units 10A and 10B when the cooling gas is jetted from the central portion R1 in the plate width direction. On the other hand, it is possible to stop the ejection of the cooling gas from the end R2 located on the outer side in the plate width direction (see FIG. 4). As a result, the high pressure part A1 (see FIG. 6) due to the collision of the gas jets hardly occurs on both sides of the metal plate 2 in the plate width direction (see FIG. 4), and the moment to increase the twist amount of the metal plate 2 is reduced. Therefore, the twist of the metal plate 2 can be suppressed.
Further, since the high pressure portion A1 is not easily generated on both sides of the metal plate 2 in the plate width direction, the flow of the gas jet that collides with the metal plate 2 to the outside in the plate width direction is not easily blocked by the high pressure portion A1. As a result, in the area within the width of the metal plate 2, the pressure in the narrower space is increased by the twisting of the metal plate 2, and a moment (torsion return moment) in the direction of reducing the twist of the metal plate 2 is generated. Since it becomes easy, 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.

  FIG. 5 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. 4. The cooling device 1 shown in FIG. 5 includes the ejection units 10A and 10B according to the embodiment described above with reference to FIGS. 1 to 4, and further has features described below.

In the exemplary embodiment shown in FIG. 5, the pair of ejection units 10A and 10B includes a plurality of chambers 16A to 16I provided side by side in the plate width direction. Each of the plurality of chambers 16A to 16I is in communication with one or more nozzle holes 14 (jet ports).
The jettable areas RA of the jet units 10A and 10B are divided into a plurality of sections in the sheet width direction, and the above-described chambers 16A to 16I are provided corresponding to the sections. The plurality of sections include a first section belonging to the central portion R1 of the spoutable areas RA of the spout units 10A and 10B, and a second section belonging to the end R2.

  Each of the chambers 16A to 16I is connected to supply lines 18A to 18I for supplying a cooling gas to these chambers, respectively, and the cooling gas pressurized by the blower 24 is supplied to the chambers via the supply lines 18A to 18I. It is supplied to 16A-16I.

The supply lines 18A-18I are provided with valves 20A-20I, respectively.
The valves 20A to 20I can switch the supply state of the cooling gas to the chambers 16A to 16I. The valves 20A to 20I may be on-off valves or may be flow control valves.

The ejection units 10A and 10B are configured to be able to switch between the ejection state and the non-ejection state of the cooling gas independently of each other for each of the plurality of sections including the first section and the second section described above. Although the chambers 16A to 16I are connected in the figure, a gap may be provided between the chambers.
Also, each chamber may be separated as a separate member, which is equivalent to the provision of a plurality of small ejection units in the plate width direction in the plate width direction. In this case, there is a jettable area RA from the jet unit at one end to the jet unit at the other end, and the jet unit (first section) that jets the cooling gas to the central portion R1 in the plate width direction; On the other hand, the ejection state and the non-ejection state of the cooling gas of the ejection unit (second section) for ejecting the cooling gas may be configured to be switchable independently.

  Furthermore, in the exemplary embodiment shown in FIG. 5, an edge sensor 26 for detecting the position of the edge 2 a of the metal plate 2 in the plate width direction is provided on the side of the metal plate 2 in the plate width direction. ing. The detection result acquired by the edge sensor 26 is sent to the controller 30 for controlling the ejection units 10A and 10B.

  Based on the detection result of the edge sensor 26, the controller 30 cools at least a part of the part outside the widthwise direction with respect to the edge 2a of the metal plate 2 in the spoutable area RA of the spout units 10A and 10B. Each ejection unit 10A, 10B is configured to be controlled to stop the ejection of gas.

  An example of control of the ejection units 10A and 10B by the controller 30 will be described with reference to FIG.

First, based on the detection result of the position of the edge 2a of the metal plate 2 received from the edge sensor 26, each of the chambers 16A to 16I of the header 12 belongs to the central portion R1 among the spoutable areas of the spouting units 10A and 10B. It is determined which of the first section and the second section belonging to the end R2 corresponds.
For example, in the case of FIG. 5, the chambers 16C to 16G located in the area within the width of the metal plate 2 correspond to the first section belonging to the central portion R1 in the width direction of the plate. It is determined that the chambers 16A to 16B and the chambers 16H to 16I located on the outer side also correspond to the second section belonging to the end R2.

Then, among the ejection units 10A and 10B, the chambers 16C to 16G corresponding to the first section are in the ejection state, and the chambers 16A to 16B and the chambers 16H to 16I corresponding to the second section are in the non-ejection state. .
When the valves 20A to 20I are on-off valves, for the chambers 16C to 16G in the jet state, the valves 20C to 20G corresponding to these chambers are opened, and cooling is performed from the nozzle holes 14 corresponding to the chambers 16C to 16G. The gas is jetted toward the metal plate 2. In addition, for the chambers 16A to 16B and 16H to 16I in the non-jetting state, the valves 20A to 20B and 20H to 20I corresponding to these chambers are closed, and the nozzle holes corresponding to the chambers 16A to 16B and 16H to 16I 14 stop the discharge of the cooling gas from 14;

  The valves 20A to 20I may be flow control valves. In this case, the cooling gas supplied from the supply lines 18A to 18I to the respective chambers 16A to 16I based on the detection results of the flowmeters 22A to 22I provided in the supply lines 18A to 18I corresponding to the respective chambers 16A to 16I. The control of the flow rate may be performed.

  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 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 characterized in that 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 findings of the present inventors, on both sides of the metal plate in the plate width direction (as shown in the drawing), the high pressure portion is generated by the collision of the gas jets from the opposing nozzles. At this time, if the metal plate is twisted for some reason, a pressure difference is generated on both surfaces of the metal plate due to the high pressure part, and a moment (torsion moment) in the direction to increase the twist amount acts on the metal plate. Since the metal plate swings, the metal plate may not be uniformly cooled in the plate width direction.

  In this respect, according to the configuration of the above (1), when the cooling gas is spouted from the central portion in the plate width direction among the spoutable regions in the plate width direction of each of the pair of spout units, the central portion is It is possible to stop the ejection of the cooling gas from the end located on the outer side in the plate width direction. 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 (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.

(2) In some embodiments, in the configuration of (1) above,
Each of the jet units includes a plurality of nozzle holes arranged along the plate width direction.

  According to the configuration of the above (2), since the jet unit includes the plurality of nozzle holes, as described in the above (1), the twist of the metal plate is reduced while reducing the amount of cooling gas required for cooling the metal plate. Can be uniformly cooled in the sheet width direction.

(3) In some embodiments, in the configuration of (1) or (2) above,
Each of the jet units includes a slit extending along the plate width direction.

  According to the configuration of the above (3), since the jet unit includes the slit extending along the plate width direction, as described in the above (1), the metal plate is improved while improving the uniformity of cooling in the plate width direction. It is possible to uniformly cool the metal plate in the plate width direction while suppressing the twisting of the metal plate.

(4) In some embodiments, in any of the configurations of (1) to (3) above,
The jettable region is divided into a plurality of sections including a first section belonging to the central portion and a second section belonging to the end section in the plate width direction,
Each of the jetting units is configured to be switchable between the jetting state and the non-jetting state of the cooling gas independently of each other for each of the plurality of sections.

  According to the configuration of the above (4), the jettable region of the jet unit is divided into a plurality of divisions including the first division belonging to the central portion in the plate width direction and the second division belonging to the end portion By making it possible to switch between the gas ejection state and the non-ejection state, the configuration of the above (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.

(5) In some embodiments, in the configuration of (4) above,
Each of the jet units includes a plurality of chambers provided side by side in the plate width direction corresponding to the plurality of sections and respectively communicating with jet ports for jetting the cooling gas;
The cooling device for the metal plate is
A plurality of supply lines respectively connected to the plurality of chambers and configured to supply the cooling gas;
A plurality of valves respectively provided in the plurality of supply lines for switching the supply state of the cooling gas to the chamber;
Equipped with

  According to the configuration of (5), the supply state of the cooling gas to the chambers corresponding to the plurality of compartments can be switched independently by the supply lines and valves provided corresponding to the respective chambers. Thus, switching can be performed between the jetted state and the non-jetted state of the cooling gas in each section, so that the configuration of the above (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.

(6) In some embodiments, in any of the configurations (1) to (5),
The cooling device for the metal plate is
An edge sensor for detecting a position of an edge of the metal plate in the plate width direction;
Each of the jet units is stopped so as to stop the jet of the cooling gas from at least a part of the portion of the jettable area outside the plate width direction based on the detection result of the edge sensor. A controller to control,
Equipped with

  According to the configuration of (6) above, based on the detection result of the position of the edge of the metal plate by the edge sensor, in the blowout possible area, in the outside in the plate width direction, the part stopping the blowout of the cooling gas is appropriately Since it can be determined, even when the plate width of the metal plate changes, the metal plate can be uniformly cooled in the plate width direction by appropriately suppressing the twist of the metal plate.

(7) 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 the above (1) to (6), which is configured to cool the metal plate heat-treated in the furnace.
Equipped with

  According to the configuration of the above (7), 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 jet 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. 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 (7), the twist of a metal plate can be suppressed and a metal plate can be uniformly cooled with respect to the board width direction.

  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 2a edge 3 pass line 6A roll 6B roll 8A guide roll 8B guide roll 10A ejection unit 10B ejection unit 12 header portion 14 nozzle hole 16A to 16I chamber 18A to 18I supply line 20A to 20I valve 22A to 22I flow rate Total 24 Blower 26 Edge sensor 30 Controller 100 Continuous heat treatment equipment A1 High pressure part MF Torsion moment R1 Center part R2 End part RA Ejectable area

Claims (7)

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 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. A metal plate cooling apparatus characterized in that it is configured to be able to stop the discharge of the cooling gas from the end of the fusible region located. The apparatus for cooling a metal plate according to claim 1, wherein each of the jetting units includes a plurality of nozzle holes arranged along the plate width direction. The apparatus for cooling a metal plate according to claim 1, wherein each of the jet units includes a slit extending along the plate width direction. The jettable region is divided into a plurality of sections including a first section belonging to the central portion and a second section belonging to the end section in the plate width direction,
4. The apparatus according to any one of claims 1 to 3, wherein each of the jetting units is configured to be switchable between the jetting state and the non-jetting state of the cooling gas independently of one another for each of the plurality of sections. The cooling device of the metal plate according to one aspect. Each of the jet units includes a plurality of chambers provided side by side in the plate width direction corresponding to the plurality of sections and respectively communicating with jet ports for jetting the cooling gas;
A plurality of supply lines respectively connected to the plurality of chambers and configured to supply the cooling gas;
A plurality of valves respectively provided in the plurality of supply lines for switching the supply state of the cooling gas to the chamber;
The metal plate cooling device according to claim 4, comprising: An edge sensor for detecting a position of an edge of the metal plate in the plate width direction;
Each of the jet units is stopped so as to stop the jet of the cooling gas from at least a part of the portion of the jettable area outside the plate width direction based on the detection result of the edge sensor. A controller to control,
The metal plate cooling apparatus according to any one of claims 1 to 5, further comprising: A furnace for heat treating the metal plate,
The cooling device according to any one of claims 1 to 6, which is 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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