Cooling deviation compensation device

Abstract

A cooling deviation compensation device is disclosed. The cooling deviation compensation device may include: an air supply device that supplies air sprayed to compensate for a cooling deviation of a steel plate; a touch roller that rotates with its outer surface in contact with the side of the steel plate in the width direction and sprays air supplied from the air supply device toward the steel plate; and a roller holder that supports the touch roller to contact the side of the steel plate.

Description

Technology Field

[0001] The disclosed invention relates to a cooling deviation compensation device, and more specifically, to a cooling deviation compensation device that minimizes the temperature difference between the center and edge portions in the width direction of a plated steel plate by injecting air through a touch roller that contacts the side of the plated steel plate. Background Technology

[0002] Generally, in a continuous galvanizing line (CGL), galvanizing is performed to ensure the corrosion resistance of steel sheets.

[0003] For this zinc plating process, a strip from a furnace is passed through a zinc pot containing molten zinc at 450–480°C, and the molten zinc is applied to the surface and back of the strip.

[0004] An air knife is installed at the top of the zinc storage tank to control the amount of zinc (plating amount) attached to both sides of the strip exiting the zinc storage tank, and high-pressure air or an inert gas such as nitrogen (hereinafter collectively referred to as 'gas') sprayed from this air knife wipes both sides of the strip to uniformly control the zinc plating amount in the width direction.

[0005] Hot-dip galvanized steel sheets that have passed through such an air knife are exposed to the atmosphere and their temperature drops rapidly to 350–440°C. When the temperature of the galvanized steel sheet drops rapidly in this way, cooling deviations occur along the width direction (Edge-Center-Edge), and these cooling deviations cause time deviations in the solidification process of the molten zinc. As a result, flow pattern defects with inconsistent color or pattern on the surface of the steel sheet occur, degrading the surface quality of the galvanized steel sheet.

[0006] Therefore, to address this issue, an air injection nozzle is installed on the upper part of the air knife to perform cooling or thermal insulation of the plated steel sheet. However, while this configuration is somewhat effective, it cannot perform cooling or insulation at a close distance to the steel sheet, resulting in a low degree of compensation for cooling deviations. Furthermore, because the structure is complex and protrudes from the surface of the steel sheet, it acts as a factor affecting worker safety. The problem to be solved

[0007] One aspect of the disclosed invention provides a cooling deviation compensation device that minimizes the temperature difference between the center and edge portions in the width direction of a plated steel sheet by injecting air through a touch roller that contacts the side of the plated steel sheet. means of solving the problem

[0008] A cooling deviation compensation device according to one embodiment of the disclosed invention may include: an air supply device that supplies air sprayed to compensate for a cooling deviation of a steel plate; a touch roller that rotates with its outer surface in contact with the side of the steel plate in the width direction and sprays air supplied from the air supply device toward the steel plate; and a roller holder that supports the touch roller to contact the side of the steel plate.

[0009] Each of the above deviation compensation devices may further include a temperature sensor that collects temperature information in the width direction of the steel plate; and a control unit that controls the air supply of the air supply device based on the temperature information in the width direction of the steel plate.

[0010] The above control unit can control the air supply amount or air supply temperature of the air supply device.

[0011] The temperature sensor may include a central temperature sensor that collects temperature information of the central portion in the width direction of the steel plate; and an edge temperature sensor that collects temperature information of the edge portion in the width direction of the steel plate.

[0012] The control unit above can control the air supply amount or air supply temperature of the air supply device based on the difference between the central temperature collected by the central temperature sensor and the edge temperature collected by the edge temperature sensor.

[0013] The above control unit can control the air supply temperature of the air supply device differently based on the sign of the difference value between the central temperature and the edge temperature.

[0014] The above control unit can control the air supply amount of the air supply device differently based on the absolute value of the difference between the central temperature and the edge temperature.

[0015] The touch roller comprises: a first touch roller that contacts one side of the steel plate in the width direction; and a second touch roller that contacts the other side of the steel plate in the width direction; the air supply device comprises: a first air supply device that supplies air to the first touch roller; and a second air supply device that supplies air to the second touch roller; the edge temperature sensor comprises: a first edge temperature sensor that collects temperature information of one edge portion in the width direction of the steel plate; and a second edge temperature sensor that collects temperature information of the other edge portion in the width direction of the steel plate; and the control unit controls the air supply amount or air supply temperature of the first air supply device based on the difference value between the central temperature collected by the central temperature sensor and the first edge temperature collected by the first edge temperature sensor, and controls the air supply amount or air supply temperature of the second air supply device based on the difference value between the central temperature collected by the central temperature sensor and the second edge temperature collected by the second edge temperature sensor.

[0016] The touch roller may include: a roller body that rotates in contact with the steel plate; an air chamber formed inside the roller body and receiving air from the air supply device; and a plurality of air injection holes arranged to communicate the outer surface of the roller body with the air chamber so that air inside the air chamber is injected through the outer surface of the roller body.

[0017] The above air injection holes may include a plurality of first air injection holes spaced apart along the circumferential direction of the roller body on one side in the direction of the rotation axis of the roller body; and a plurality of second air injection holes spaced apart along the circumferential direction of the roller body on the other side in the direction of the rotation axis of the roller body.

[0018] The roller body has a concave portion formed on the outer surface contacting the steel plate, the central portion in the direction of the rotation axis is curved inward, and the first air injection hole is inclined so that as it moves outward from the center of the rotation axis, it faces the other side in the direction of the rotation axis, and the second air injection hole is inclined so that as it moves outward from the center of the rotation axis, it faces the one side in the direction of the rotation axis, from the other side in the direction of the rotation axis.

[0019] The touch roller further comprises: a fixed shaft that penetrates the roller body and is coupled to the roller holder; and a bearing provided between the fixed shaft and the roller body to rotatably couple the roller body; and the fixed shaft may be provided with a fixed shaft supply passage configured to supply air supplied from the air supply device to the air chamber.

[0020] The roller holder may be provided with a receiving portion in which one side of the steel plate is open and the other side is closed, and the touch roller is received. Effects of the invention

[0021] A cooling deviation compensation device according to one embodiment of the disclosed invention can compensate for a cooling deviation by spraying air for cooling or heat retention onto the side of a plated steel sheet.

[0022] A cooling deviation compensation device according to one embodiment of the disclosed invention can efficiently compensate for cooling deviations and ensure the quality of the plated steel sheet by injecting air for cooling or heat retention in direct contact with the side of the plated steel sheet.

[0023] A cooling deviation compensation device according to one embodiment of the disclosed invention has a simple structure and installation and can ensure the safety of surrounding workers. Brief explanation of the drawing

[0024] FIG. 1 is a schematic diagram illustrating a zinc plating facility according to one embodiment of the disclosed invention. FIG. 2 is a schematic diagram illustrating the appearance of a cooling deviation compensation device according to one embodiment of the disclosed invention. FIGS. 3 and FIGS. 4 are schematic drawings illustrating a touch roller device according to one embodiment of the disclosed invention. FIG. 5 is a schematic diagram illustrating a control unit according to one embodiment of the disclosed invention. FIG. 6 is a diagram schematically illustrating the control steps of a cooling deviation compensation device according to one embodiment of the disclosed invention. FIG. 7 is a diagram schematically illustrating the detailed control steps of a cooling deviation compensation device according to one embodiment of the disclosed invention. Specific details for implementing the invention

[0025] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments introduced below are provided as examples to ensure that the concept of the present invention is sufficiently conveyed to those skilled in the art to which the present invention pertains. The present invention is not limited to the embodiments described below and may be embodied in other forms. To clearly explain the present invention, parts unrelated to the description have been omitted from the drawings, and in the drawings, the width, length, thickness, etc., of components may be exaggerated for convenience. Throughout the specification, the same reference numerals indicate the same components.

[0026] FIG. 1 is a schematic diagram illustrating a zinc plating facility according to one embodiment of the disclosed invention.

[0027] Referring to FIG. 1, a strip (coil steel plate) (S) unwound from a pay-off reel is heat-treated, then passes through a snout (21) and then through a zinc storage tank (20) filled with molten zinc to perform plating.

[0028] And, as the steel plate (S) passes through the air knife (10) installed on the upper surface of the zinc storage tank (20), the molten zinc on the surface of the steel plate (S) is appropriately cut by the high-pressure gas sprayed onto the surface of the steel plate (S), and the plating thickness is controlled.

[0029] Whether the plating amount of the steel plate (S) is appropriate is measured by the plating amount measuring gauge (30), and by feeding back this measurement value, the plating amount is controlled by adjusting the gas discharge pressure of the air knife (10), the gap between the steel plate (S) and the air knife (10), or the movement speed of the steel plate (S).

[0030] Meanwhile, the unexplained reference numerals '22' and '23' are a sink roll and a stabilizing roll that guide the steel plate (S) into the zinc storage tank (20) and suppress vibration of the steel plate (S).

[0031] As described above, the molten galvanized steel sheet (S) that has passed through the air knife (10) is exposed to the atmosphere and its temperature drops rapidly. Since a cooling deviation may occur in the width direction of the steel sheet (S) when the temperature drops rapidly, a cooling deviation compensation device is provided to compensate for such cooling deviation.

[0032] FIG. 2 is a schematic diagram illustrating the appearance of a cooling deviation compensation device according to one embodiment of the disclosed invention.

[0033] Referring to FIG. 2, a cooling deviation compensation device according to one embodiment of the disclosed invention may include: an air supply device (200) that supplies air sprayed to compensate for a cooling deviation of a steel plate (S); a touch roller device (100) comprising a touch roller (110) that rotates with its outer surface contacting the side of the steel plate (S) in the width direction and sprays air supplied from the air supply device (200) toward the steel plate (S), a roller holder (120) that supports the touch roller (100) to contact the side of the steel plate (S), and a fixed shaft (130) that penetrates the roller body and is coupled to the roller holder; a temperature sensor (300) that collects temperature information in the width direction of the steel plate (S); and a control unit (400) that controls the air supply of the air supply device (200) based on the temperature information in the width direction of the steel plate (S).

[0034] The touch roller (110) of the touch roller device (100) rotates in contact with the side of the steel plate (S) in the width direction and sprays air toward the steel plate (S) to compensate for the cooling deviation of the steel plate (S).

[0035] The air supply device (200) supplies air to the touch roller device (100) under the control of the control unit (400). The air supply device (200) may include an air pump, etc. for supplying air, a valve, etc. for controlling the amount of air supplied, and a heating and cooling device, etc. for controlling the temperature of the air supplied.

[0036] Meanwhile, the touch roller device (100) receives air from the air supply device (200) through the air supply channel (210) and performs cooling or insulation of the edge portion in contact with the touch roller (110) by spraying air onto the steel plate (S) through the air injection hole provided in the touch roller (110). That is, by controlling the supply amount and temperature of the air supplied by the air supply device (200), the supply amount and temperature of the air sprayed through the touch roller (110) are controlled, and thereby cooling or insulation of the edge portion of the steel plate (S) where the air is sprayed is performed.

[0037] Generally, an air knife (10) for controlling the plating thickness of a steel plate (S) is positioned between the plated steel plate (S) as shown in FIG. 1 and sprays air. At this time, since the air knife (10) sprays air over an area wider than the width of the plated steel plate (S), a baffle plate (500) is provided so that the air from both air knives (10) does not collide at the outer edge of the plated steel plate (S). Such a baffle plate (500) is coupled to a driving unit (600) including a driving device (610) and a connecting part (620) to move together with the change in width of the steel plate (S), and the driving unit (600) is coupled to a guide roller that contacts the edge in the width direction of the steel plate (S) to correspond to the change in width of the steel plate (S).

[0038] In the disclosed invention, the guide roller connected to such a baffle plate (500) is replaced with a touch roller device (100), and an air supply device (200) is installed and connected, thereby compensating for the cooling deviation of the steel plate (S) while using the conventional galvanizing equipment as is.

[0039] The temperature sensor (300) may include a central temperature sensor (310) that collects temperature information of the central portion in the width direction of the steel plate (S); and an edge temperature sensor (320) that collects temperature information of the edge portion in the width direction of the steel plate (S).

[0040] The control unit (400) can control the air supply amount or air supply temperature of the air supply device (200). The control unit (400) can use temperature information from the temperature sensor (300) to control the air supply device (200). Specifically, the control unit (400) can control the air supply amount or air supply temperature of the air supply device (200) based on the difference between the central temperature collected by the central temperature sensor (310) and the edge temperature collected by the edge temperature sensor (320).

[0041] Meanwhile, as illustrated in FIG. 2, a cooling deviation compensation device according to one embodiment of the disclosed invention can perform cooling deviation compensation for both sides of a steel plate (S).

[0042] To this end, the touch roller device (100) includes a first touch roller device (100a) that contacts one side in the width direction of the steel plate (S) (right side in FIG. 2); and a second touch roller device (100b) that contacts the other side in the width direction of the steel plate (S) (left side in FIG. 2); the air supply device (200) includes a first air supply device (200a) that supplies air to the first touch roller device (100a); and a second air supply device (200b) that supplies air to the second touch roller device (100b); and the edge temperature sensor (320) may include a first edge temperature sensor (320a) that collects temperature information of the edge portion on one side in the width direction of the steel plate (S) (right side in FIG. 2); and a second edge temperature sensor (320b) that collects temperature information of the edge portion on the other side in the width direction of the steel plate (S) (left side in FIG. 2).

[0043] In this way, the touch roller device (100), the air supply device (200), and the edge temperature sensor (320) are each provided on both sides of the steel plate (S) to perform cooling deviation compensation for both sides of the steel plate (S).

[0044] At this time, the control unit (400) can control the air supply amount or air supply temperature of the first air supply device (200a) based on the difference between the central temperature collected by the central temperature sensor (310) and the first edge temperature collected by the first edge temperature sensor (320a), and control the air supply amount or air supply temperature of the second air supply device (200b) based on the difference between the central temperature collected by the central temperature sensor (310) and the second edge temperature collected by the second edge temperature sensor (320). That is, the control unit (400) can independently perform cooling deviation compensation for each of the two sides of the steel plate (S).

[0045] FIGS. 3 and FIGS. 4 are schematic drawings illustrating a touch roller device according to one embodiment of the disclosed invention.

[0046] FIG. 3 is a cross-sectional view of section A-A' of the first touch roller device (100a) disclosed in FIG. 2, and FIG. 4 is a cross-sectional view of section B-B' of the first touch roller device (100a) disclosed in FIG. 3. Since the first touch roller device (100a) and the second touch roller device (100b) have the same structure with only different directions, they will be described as the touch roller device (100) below.

[0047] Referring to FIGS. 3 and 4, a touch roller (110) according to one embodiment of the disclosed invention may include: a roller body (111) that rotates in contact with a steel plate (S); an air chamber (112) formed inside the roller body (111) and receiving air from an air supply device (200); and a plurality of air injection holes (113) arranged to communicate the outer surface (114) of the roller body (111) with the air chamber (112) so that air inside the air chamber (112) is injected through the outer surface (114) of the roller body (111).

[0048] Meanwhile, the touch roller device (100) may further include a bearing (140) provided between a fixed shaft (130) and a roller body (111) to rotatably connect the roller body (111).

[0049] At this time, the fixed shaft (130) may be provided with a fixed shaft supply channel (131) that is configured to supply air supplied from the air supply device (200) to the air chamber (112).

[0050] That is, the air supply device (200) supplies air to the fixed shaft (130) through the air supply channel (210), the fixed shaft (130) supplies air to the air chamber (112) inside the roller body (111) through the fixed shaft supply channel (131), and the air inside the air chamber (112) is sprayed toward the steel plate (S) through the air injection hole (113). This air flow is indicated by arrows in FIGS. 3 and FIGS. 4.

[0051] Meanwhile, the plurality of air injection holes (113) may include a plurality of first air injection holes (113a) spaced apart along the circumferential direction of the roller body (111) on one side of the rotational axis direction of the roller body (111) (upper side in FIG. 3); and a plurality of second air injection holes (113b) spaced apart along the circumferential direction of the roller body (111) on the other side of the rotational axis direction of the roller body (111) (lower side in FIG. 3). Referring to FIG. 4, the appearance of the plurality of second air injection holes (113b) spaced apart along the circumferential direction can be seen. The second air injection holes (113b) are provided to communicate the outer surface (114) of the roller body (111) and the air chamber (112) so that air inside the air chamber (112) is injected to the outer surface of the roller body (111) as indicated by the arrow.

[0052] That is, a plurality of air injection holes (113) can be provided on one side and the other side in the direction of the rotation axis. By providing air injection holes (113) on one side and the other side in the direction of the rotation axis in this way, air can be injected onto the front surface (upper side of FIG. 3) and the rear surface (lower side of FIG. 3) of the steel plate (S) as shown in FIG. 3.

[0053] Meanwhile, referring to FIG. 3, the roller body (111) has a concave portion formed on the outer surface (114) that contacts the steel plate (S), with the central portion in the direction of the rotation axis being curved inward. The first air injection hole (113a) is inclined so that as it moves outward from the center of the rotation axis, it faces the other side in the direction of the rotation axis (lower side in FIG. 3) from one side in the direction of the rotation axis of the concave portion (upper side in FIG. 3), and the second air injection hole (113b) is inclined so that as it moves outward from the center of the rotation axis, it faces the one side in the direction of the rotation axis (upper side in FIG. 3) from the other side in the direction of the rotation axis of the concave portion (lower side in FIG. 3). Through this structure, air injected through the first air injection hole (113a) can be injected outward from the touch roller (110) and directed toward the steel plate (S) in an inclined direction (lower side of FIG. 3), and air injected through the second air injection hole (113b) can be injected outward from the touch roller (110) and directed toward the steel plate (S) in an inclined direction (upper side of FIG. 3). Therefore, the air injected through the touch roller (110) can efficiently contact the edge portion of the steel plate (S), and cooling or heat retention can be achieved through heat exchange, thereby compensating for the temperature difference in the width direction of the steel plate (S).

[0054] Meanwhile, the roller holder (120) may be provided with a receiving portion (125) in which a touch roller (110) is received, with one side of the steel plate (S) open and the other side closed.

[0055] The receiving portion (125) provided in the roller holder (120) has one side facing the steel plate (S) (left side in FIG. 3 and FIG. 4) open, and the other side closed. The touch roller (110) received in the receiving portion (125) has a plurality of air injection holes (113) provided along the circumferential direction on the outer surface (114) of the roller body (111). Thus, air can be injected not only through the air injection holes (113) facing the steel plate (S) but also through the air injection holes (113) facing other directions. At this time, since only one side facing the steel plate (S) of the receiving portion (125) of the roller holder (120) is open, the air injected in other directions cannot be discharged to the outside and is discharged through the one side facing the steel plate (S) of the receiving portion (125). This air flow is illustrated by an arrow in FIG. 4. Accordingly, not only the air injected through the air injection hole (113) toward the steel plate (S) but also the air injected through the air injection hole (113) toward other directions can be discharged toward the steel plate (S) to perform cooling or thermal insulation on the edge portion of the steel plate (S). That is, the touch roller device (100) of the disclosed invention can efficiently compensate for temperature deviations without wasting air through the structure of the receiving portion (125) of the roller holder (120).

[0056] FIG. 5 is a schematic diagram illustrating a control unit according to one embodiment of the disclosed invention.

[0057] As described above, the control unit (400) receives temperature information collected by the central temperature sensor (310), the first edge temperature sensor (320a), and the second edge temperature sensor (320b), and can control the first air supply device (200a) and the second air supply device (200b) based thereon.

[0058] In detail, the control unit (400) can control the air supply amount or air supply temperature of the first air supply device (200a) based on the difference between the central temperature collected by the central temperature sensor (310) and the first edge temperature collected by the first edge temperature sensor (320a), and control the air supply amount or air supply temperature of the second air supply device (200b) based on the difference between the central temperature collected by the central temperature sensor (310) and the second edge temperature collected by the second edge temperature sensor (320).

[0059] FIG. 6 is a diagram schematically illustrating the control steps of a cooling deviation compensation device according to one embodiment of the disclosed invention, and FIG. 7 is a diagram schematically illustrating the detailed control steps of a cooling deviation compensation device according to one embodiment of the disclosed invention.

[0060] Referring to FIG. 6, the control unit (400) detects the temperature of the steel plate (S) (710), determines the temperature deviation in the width direction based on the detected temperature (720), and sets variables such as the supply amount or temperature of air supplied to compensate for the temperature deviation in the width direction.

[0061] In detail, the control unit (400) can control the air supply temperature of the air supply device (200) differently based on the sign of the difference between the center temperature and the edge temperature of the steel plate (S), and can control the amount of air supplied by the air supply device (200) differently based on the absolute value of the difference between the center temperature and the edge temperature.

[0062] Referring to Fig. 7, the detailed steps of such control can be confirmed.

[0063] The control unit (400) controls the central temperature (T) through the central temperature sensor (310). C ) detects (711), and the edge temperature (T) through the edge temperature sensor (320) E ) can be detected (712).

[0064] Central temperature detected thereafter (T C) and edge temperature (T E Determines the sign of the difference value of ). Central temperature (T C ) and edge temperature (T E The difference value of ) (T C -T E If ) is 0 or greater, it can be determined that a cooling deviation has occurred in which the edge portion of the steel plate (S) cools faster than the center portion, and if ) is less than 0, it can be determined that a cooling deviation has occurred in which the center portion of the steel plate (S) cools faster than the edge portion.

[0065] Therefore, the control unit (400) is the central temperature (T C ) and edge temperature (T E The difference value of ) (T C -T E If ) is 0 or greater, the first air temperature for insulating the overcooled edge portion is set as the air supply temperature (731), and the center temperature (T C ) and edge temperature (T E The difference value of ) (T C -T E When ) is less than 0, the second air temperature for cooling the edge portion to the center portion can be set as the air supply temperature (732). At this time, the first air temperature becomes higher than the second air temperature.

[0066] Meanwhile, the detected central temperature (T C ) and edge temperature (T E The control unit (400) determines the magnitude of the absolute value of the difference of the central temperature (T C ) and edge temperature (T E If the magnitude of the absolute value of the difference is large, it is determined that the cooling deviation in the width direction of the steel plate (S) is large, so the air supply amount for cooling deviation compensation is increased, and the central temperature (T C ) and edge temperature (T E If the absolute value of the difference is small, it is determined that the cooling deviation in the width direction of the steel plate (S) is small, and the amount of air supplied for cooling deviation compensation can be reduced.

[0067] In one embodiment of the disclosed invention, such a central temperature (T C ) and edge temperature (T E The amount of air supplied can be determined by classifying the intervals of the absolute value of the difference.

[0068] As shown in Fig. 7, the central temperature (T C ) and edge temperature (T E If the absolute value of the difference is greater than or equal to the first reference temperature (T1), the air supply amount is set to the first supply flow rate, and the central temperature (T C ) and edge temperature (T E If the absolute value of the difference is less than the first reference temperature (T1) and greater than or equal to the second reference temperature (T2), the air supply amount is set to the second supply flow rate, and the central temperature (T C ) and edge temperature (T E If the absolute value of the difference is less than the second reference temperature (T2), the air supply amount can be set to the third supply flow rate. In this case, the first supply flow rate is greater than the second supply flow rate, and the second supply flow rate is greater than the third supply flow rate.

[0069] Meanwhile, in another embodiment of the disclosed invention, the control unit (400) has a central temperature (T C ) and edge temperature (T E The air supply amount can be changed in proportion to the magnitude of the absolute difference of ). For example, the control unit (400) can change the central temperature (T) to the previous air supply amount (F). C ) and edge temperature (T E The new air supply amount (F') can be set by adding the value obtained by multiplying the absolute value of the difference by a conversion factor (a) (F' = F + a*|T C - T E At this time, it is preferable that the central temperature sensor (310) and the edge temperature sensor (320) be positioned after the steel plate (S) passes through the touch roller device (100) as shown in FIG. 2.

[0070] The control unit (400) can set the air supply temperature and supply amount in this manner and control the air supply device (200) to supply air according to the set air supply temperature and supply amount. By supplying air to the touch roller device (100) according to the air supply temperature and supply amount set in this manner, the air supply device (200) performs thermal insulation or cooling of the edge portion of the steel plate (S), thereby enabling efficient compensation for the cooling deviation of the steel plate (S). Explanation of the symbols

[0071] S: Steel plate 10: Air knife 20: Zinc storage tank 100: Touch roller device 110: Touch roller 120: Roller holder 130: Roller shaft 200: Air supply unit 300: Temperature sensor 310: Central temperature sensor 320a: First edge temperature sensor 320b: Second edge temperature sensor 400: Control unit 500: Baffle plate 600: Driving device

Claims

Claim 1 A cooling deviation compensation device comprising: an air supply device for supplying air to be sprayed to compensate for a cooling deviation of a steel plate; a touch roller that rotates with its outer surface in contact with the side of the steel plate in the width direction and sprays air supplied from the air supply device toward the steel plate; and a roller holder that supports the touch roller to contact the side of the steel plate. Claim 2 A cooling deviation compensation device according to claim 1, further comprising: a temperature sensor for collecting temperature information in the width direction of the steel plate; and a control unit for controlling the air supply of the air supply device based on the temperature information in the width direction of the steel plate. Claim 3 In paragraph 2, the control unit is a cooling deviation compensation device that controls the air supply amount or air supply temperature of the air supply device. Claim 4 In paragraph 2, the temperature sensor comprises: a central temperature sensor that collects temperature information of the central portion in the width direction of the steel plate; and an edge temperature sensor that collects temperature information of the edge portion in the width direction of the steel plate; a cooling deviation compensation device. Claim 5 In paragraph 4, the control unit is a cooling deviation compensation device that controls the air supply amount or air supply temperature of the air supply device based on the difference value between the central temperature collected by the central temperature sensor and the edge temperature collected by the edge temperature sensor. Claim 6 In paragraph 5, the control unit is a cooling deviation compensation device that controls the air supply temperature of the air supply device differently based on the sign of the difference value between the central temperature and the edge temperature. Claim 7 In paragraph 5, the control unit is a cooling deviation compensation device that controls the air supply amount of the air supply device differently based on the absolute value of the difference between the central temperature and the edge temperature. Claim 8 In claim 4, the touch roller comprises: a first touch roller that contacts one side of the steel plate in the width direction; and a second touch roller that contacts the other side of the steel plate in the width direction; the air supply device comprises: a first air supply device that supplies air to the first touch roller; and a second air supply device that supplies air to the second touch roller; the edge temperature sensor comprises: a first edge temperature sensor that collects temperature information of one edge portion in the width direction of the steel plate; and a second edge temperature sensor that collects temperature information of the other edge portion in the width direction of the steel plate; and the control unit controls the air supply amount or air supply temperature of the first air supply device based on the difference value between the central temperature collected by the central temperature sensor and the first edge temperature collected by the first edge temperature sensor, and controls the air supply amount or air supply temperature of the second air supply device based on the difference value between the central temperature collected by the central temperature sensor and the second edge temperature collected by the second edge temperature sensor. Claim 9 A cooling deviation compensation device according to claim 1, wherein the touch roller comprises: a roller body that rotates in contact with the steel plate; an air chamber formed inside the roller body and receiving air from the air supply device; and a plurality of air injection holes arranged to communicate the outer surface of the roller body with the air chamber so that air inside the air chamber is injected through the outer surface of the roller body. Claim 10 A cooling deviation compensation device according to claim 9, wherein the air injection holes include: a plurality of first air injection holes spaced apart along the circumferential direction of the roller body on one side in the direction of the rotation axis of the roller body; and a plurality of second air injection holes spaced apart along the circumferential direction of the roller body on the other side in the direction of the rotation axis of the roller body. Claim 11 A cooling deviation compensation device according to claim 10, wherein the roller body has a concave portion formed on the outer surface contacting the steel plate, the central portion in the direction of the rotation axis is curved inward, the first air injection hole is inclined so that as it moves outward from the center of the rotation axis, it faces the other side in the direction of the rotation axis, and the second air injection hole is inclined so that as it moves outward from the center of the rotation axis, it faces the one side in the direction of the rotation axis, the cooling deviation compensation device. Claim 12 A cooling deviation compensation device according to claim 9, wherein the touch roller further comprises: a fixed shaft that penetrates the roller body and is coupled to the roller holder; and a bearing provided between the fixed shaft and the roller body to which the roller body is rotatably coupled, wherein the fixed shaft is provided with a fixed shaft supply passage provided to supply air supplied from the air supply device to the air chamber. Claim 13 In claim 9, the roller holder is provided with a receiving portion in which one side of the steel plate side is open and the other side is closed, and the touch roller is received; a cooling deviation compensation device.

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