Cooling device for heat treatment

Abstract

To provide a cooling device for heat treatment that performs heat treatment such that a required cooling capacity can be secured for heated metal objects.SOLUTION: The cooling device includes: a chamber 200 to be charged with multiple objects 10 through one open side thereof; an individual cooling unit 300 configured to be provided in the chamber, to individually cover each object, and to spray a cooling medium onto the object; and a driving unit 700 configured to be provided on the chamber and to move the individual cooling unit in the vertical direction. With this configuration, it is possible to secure a required cooling capacity by cooling heated metal objects individually or as a whole.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a cooling device for heat treatment, and more particularly, to a cooling device for heat treatment that individually cools or globally cools a heated metal object for heat treatment.

Background Art

[0002] A cooling device for heat treatment of metal products is used for the purpose of controlling the mechanical properties of metals by utilizing the phase transformation characteristics of metal products. The cooling device mainly aims at rapid cooling and cooling control of products, and utilizes oil or high-pressure gas fluid with excellent cooling ability as a cooling medium.

[0003] Recently, there has been a tendency to use more gas as a cooling medium from the aspects of being environmentally friendly and easy control of the cooling medium. However, there is a limit to the overall uniform cooling control for multiple stacked processed products of one or more stages (hereinafter, one stage is referred to as 2D stacking, and two or more stages are referred to as 3D stacking), and a high-pressure gas supply line is required to ensure the cooling ability.

[0004] Korean Registered Patent No. 10-2302307 (hereinafter referred to as "Patent Document 1") discloses a method and apparatus for thermoscientifically curing a work piece.

[0005] The above Patent Document 1 discloses an apparatus including two or more cementing chambers capable of directly heating a work piece by thermal radiation, a cooling device, and a transmission system.

[0006] The two or more cementing chambers, cooling device, and transmission system disclosed in the above Patent Document 1 enable rapid heating of the work piece, and in order to prevent complicated post-machining due to the generation of severe thermal distortion of the 3D stacked work piece, 30 to 100% of the surface of the work piece can be heated by the direct thermal radiation of the heating device. By using 2D stacking in which the work pieces are arranged side by side with each other, a method for preventing severe thermal distortion of the work piece is disclosed.

[0007] In addition, Korean Registered Patent Publication No. 10-2395488 (hereinafter referred to as "Patent Document 2") discloses a multi-chamber furnace for vacuum carburizing and quenching of gears, shafts, rings and similar workpieces.

[0008] The multi-chamber furnace of Patent Document 2 includes two or more process chambers (connected in parallel) arranged in a vacuum space and configured in a vertical or horizontal arrangement, and is fed continuously with individual workpieces. It has an integrated transfer chamber with a loading and unloading system that can cooperate with the individual process chambers via doors provided at the ends of the process chambers, and is configured to include equipment for individual gas quenching of workpieces within the furnace operating cycle in the unloading lock. In addition, the device for individual gas quenching of workpieces is composed of a system of gas nozzles for pressurizing the flow of cooling gas and a two-part nozzle collector including a base. Thereby, a method for minimizing thermal distortion when cooling the individual workpieces after heat treatment is disclosed.

[0009] However, these conventional cooling devices have limitations in scalability depending on the shape of the product or limitations in the structure of the cooling chamber depending on the structural form of the heating chamber, and there is a problem that it is difficult to achieve the intended uniform cooling control for various loading forms considering the quantity of processed products and 3D stacking, etc.

Prior Art Documents

Patent Documents

[0010]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0011] The present invention was devised to solve the above problems, and an object thereof is to provide a cooling device for heat treatment that can ensure the required cooling capacity by individually cooling or overall cooling a heated metal object.

Means for Solving the Problems

[0012] In order to achieve the above object, a cooling device for heat treatment according to a preferred embodiment of the present invention may include a chamber into which a plurality of objects are loaded through an open side, an individual cooling unit provided in the chamber for individually covering the object and injecting a cooling medium onto the object, and a driving unit provided in the chamber for moving the individual cooling unit in the vertical direction.

[0013] Here, the individual cooling unit may include a cover portion having a hollow interior for arranging the object therein and an open side, a cooling medium supply pipe provided in the driving unit and moving in the vertical direction and fastened to the other side of the cover portion for supplying a cooling medium into the cover portion, and a cooling medium supply unit connected to the cooling medium supply pipe for supplying a cooling medium.

[0014] Further, the cover portion may be formed in a box shape with an open side and formed in a double-wall shape so that a cooling medium flows into the interior, and may include a cover portion body having an outer wall communicating with the cooling medium supply pipe, and a nozzle portion communicating with the inner wall of the cover portion body and protruding inside the cover portion body for injecting a cooling medium onto the object.

[0015] Further, the cover portion may include a plurality of pressing pins protruding from the inner surface of the upper side of the cover portion body for pressing the object.

[0016] With such a configuration, a plurality of objects are arranged on a jig tray, and the jig tray is loaded into the chamber through a transfer jig and comes to rest on an object support portion provided in the chamber.

[0017] Here, the object support part may include a plurality of support pins that penetrate the jig tray and support the object.

[0018] With such a configuration, after the jig tray descends and the object is supported by the plurality of support pins, and then separated from the jig tray, the cover part descends and the object is pressurized by the plurality of pressure pins, and a cooling medium may be injected through the nozzle part.

[0019] Further, the cooling medium supply part may include a cooling medium storage tank in which a cooling medium is stored, a cooling medium supply line connecting the cooling medium storage tank and the chamber, and a flexible supply pipe having one end fastened to the chamber and connected to the cooling medium supply line and the other end connected to the cooling medium supply pipe, the length of which is variable corresponding to the movement of the cooling medium supply pipe.

[0020] As an example, when the cooling medium is a gas, the cooling medium supply part may include a cooling medium recovery tank for recovering the cooling medium supplied to the chamber, and a cooling medium compressor for compressing the cooling medium stored in the cooling medium recovery tank and supplying it to the cooling medium storage tank.

[0021] As another example, when the cooling medium is oil, the cooling medium supply part may include a cooling medium supply pump for supplying the cooling medium stored in the cooling medium storage tank to the cooling medium supply pipe, a cooling medium recovery tank for recovering the cooling medium supplied to the chamber, a cooling medium return pump for supplying the cooling medium stored in the cooling medium recovery tank to the cooling medium storage tank, and a cooling medium cooling part for cooling the oil stored in the cooling medium recovery tank.

[0022] Furthermore, the cooling device for heat treatment of the present invention may further include a common cooling part for injecting a cooling medium inside the chamber when the cooling medium is a gas.

[0023] More specifically, the common cooling unit may be provided inside the chamber, and may include a common cooling medium injection nozzle that injects a cooling medium inside the chamber, and a common cooling medium supply line that connects the cooling medium storage tank and the common cooling medium injection nozzle.

Advantages of the Invention

[0024] According to the cooling device for heat treatment of the present invention, by individually cooling or collectively cooling the heated metal object, it is possible to obtain the effect of ensuring the required cooling capacity.

[0025] Also, according to the present invention, since the object can be cooled after being separated from the base jig, the total amount of heat to be cooled is reduced, and the effect of being able to cool more quickly and effectively can be obtained.

[0026] Also, according to the present invention, by injecting a cooling medium while the object is under pressure, it is possible to obtain the effect of preventing the object from undergoing thermal deformation and cooling it.

[0027] Also, according to the present invention, since nitrogen gas or oil is used as the cooling medium, it is possible to obtain the effect of reducing costs and preventing safety accidents without using high-risk and high-cost gases such as hydrogen and helium.

[0028] Furthermore, according to the present invention, by supplying the cooling medium at a sufficient flow rate even under low supply pressure conditions of the cooling medium to ensure the required cooling capacity, a desired cooling effect can be obtained.

Brief Description of the Drawings

[0029]

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Embodiments for Carrying Out the Invention

[0030] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0031] Since the present invention can be subjected to various modifications and can have various embodiments, specific embodiments are illustrated in the drawings and specifically described in the detailed description. This is not intended to limit the present invention to specific embodiments, but should be construed as including all modifications, equivalents or alternatives included in the spirit and technical scope of the present invention.

[0032] The terms used in this application are used only for explaining specific embodiments and are not intended to limit the present invention. Singular expressions can include plural expressions unless the context clearly indicates otherwise.

[0033] Unless otherwise defined, all terms used herein, including technical and scientific terms, may be construed to have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries may be construed to have a meaning consistent with the meaning in the context of the relevant art and are not to be construed in an idealized or overly formal sense unless expressly defined otherwise in this application.

[0034] Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings.

[0035] FIG. 1 and FIG. 2 are a perspective view and a cross-sectional view schematically showing a cooling device for heat treatment according to an embodiment of the present invention. FIGS. 3 and 4 are cross-sectional views schematically showing a state in which an individual cooling unit individually covers and presses a target object in the cooling device for heat treatment. FIG. 5 is an enlarged view schematically showing an extract of region A in FIG. 4. Further, FIG. 6 is a view schematically showing a state in which a configuration for supplying a cooling medium to a chamber is connected in the cooling device for heat treatment. FIG. 7 is a view schematically showing a supply line of a cooling medium for individual cooling in the cooling device for heat treatment. FIG. 8 is a view schematically showing a supply line of a cooling medium for common cooling in the cooling device for heat treatment. Further, FIG. 9 is a view schematically showing a configuration for supplying oil as a cooling medium to a chamber in the cooling device for heat treatment. FIG. 10 is a perspective view schematically showing an example of a heating furnace for heat-treating a target object.

[0036] Referring to FIGS. 1 to 10, a cooling device 100 for heat treatment according to an embodiment of the present invention includes a chamber 200 in which a plurality of target objects 10 are loaded and arranged therein through an open side, an individual cooling unit 300 that individually covers the target object 10 and injects a cooling medium onto the target object 10, and a drive unit 700 provided in the chamber 200 that moves the individual cooling unit 300 in the vertical direction.

[0037] Here, the chamber 200 is formed to have a hollow interior so that a plurality of the objects 10 are seated therein and the individual cooling unit 300 for cooling the object 10 is provided. Further, one side of the chamber 200 is formed to be open so that a plurality of the objects 10 can be loaded into or withdrawn from the interior. Of course, the open side of the chamber 200 may be closed by a separate door unit (not shown).

[0038] As an example, the object 10 may be loaded into the chamber 200 via a transfer chamber after being heat-treated in the heating furnace 1 shown in FIG. 10. At this time, the transfer chamber may be disposed in close contact with the open side of the chamber 200, and cooling may be performed in a state where the open side of the chamber 200 is sealed, or the transfer chamber may be separated from the chamber 200, and cooling may be performed after the door unit closes the open side of the chamber 200.

[0039] Further, the plurality of objects 10 may be disposed on a jig tray 20, and the jig tray 20 may be provided so as to be loadable into or withdrawable from the chamber 200 via a transfer jig 40 provided in a transfer chamber. Here, the transfer jig 40 may be composed of a telescope. That is, via the telescope provided in the transfer chamber, the object 10 heated in the heating furnace 1 is pulled out and loaded into the transfer chamber, and after moving to the chamber 200, the object 10 may be loaded into the chamber 200 via the telescope.

[0040] At this time, an object support portion 210 is provided at the inner bottom of the chamber 200, and cooling of the object 10 is performed with the jig tray 20 seated on the object support portion 210. Of course, cooling may be performed with the jig tray 20 disposed on the transfer jig 40.

[0041] The individual cooling unit 300 is configured to individually cool the plurality of objects 10 by covering the plurality of objects 10 loaded into the chamber 200 individually and then injecting a cooling medium onto the objects 10.

[0042] Therefore, the individual cooling unit 300 may include a cover portion 310 having a hollow interior for disposing the object 10 therein and having one side open, a cooling medium supply pipe 320 provided in the driving unit 700 and moving in the vertical direction and fastened to the other side of the cover portion 310 to supply a cooling medium into the cover portion 310, and cooling medium supply units 510, 520 connected to the cooling medium supply pipe 320 to supply a cooling medium.

[0043] That is, the individual cooling unit 300 is configured to be able to individually cool the plurality of objects 10 by supplying a cooling medium into the cover portion 310 after the cover portion 310 individually covers the objects 10.

[0044] As an example, the object 10 may be provided as a rack gear as shown in FIG. 1. At this time, the cover portion 310 may be formed in a form capable of accommodating the bar-shaped rack gear.

[0045] More specifically, the cover portion 310 is formed in a box shape with one side open, formed in a double-wall shape so that a cooling medium flows into the interior, a cover portion body 311 having an outer wall communicating with the cooling medium supply pipe 320, and a nozzle portion 312 communicating with the inner wall of the cover portion body 311 and protruding inside the cover portion body 311 to inject a cooling medium onto the object 10.

[0046] Here, a plurality of the nozzle portions 312 may be formed along the side surface on the inner circumferential surface of the cover portion body 311 so as to inject a cooling medium onto the object 10 provided inside the cover portion body 311.

[0047] Further, the cover portion 310 may further include a plurality of pressing pins 313 that are formed to protrude on the inner surface above the cover portion body 311 and press the object 10. That is, when the object 10 is accommodated inside the cover portion 310, the pressing pins 313 come to press the object 10.

[0048] Further, the object support portion 210 may further include a plurality of support pins 211 that penetrate the jig tray 20 and support the object 10. Here, in the jig tray 20, support pin through holes 21 are formed so that the support pins 211 can be inserted into the portions where the support pins 211 are arranged.

[0049] With such a configuration, when the jig tray 20 descends and a plurality of the support pins 211 are inserted through the support pin through holes 21, the object 10 is supported, and as shown in FIG. 3, the object 10 is spaced apart from the jig tray 20. Also, when the cover portion 310 descends and the object 10 is inserted inside the cover portion 310, the object 10 is pressed by the plurality of pressing pins 313. That is, as shown in FIG. 4, the object 10 is in a state of being pressed by the plurality of support pins 211 and the plurality of pressing pins 313, and at this time, a cooling medium can be sprayed onto the object 10 through the nozzle portion 312 for cooling. In the case of a rack gear, since it is formed with a long length, there is a possibility that a torsional phenomenon of the rack gear may occur during the cooling process. Therefore, in the present invention, by cooling the object 10 in a state of being pressed by the plurality of support pins 211 and the plurality of pressing pins 313, it is possible to prevent the occurrence of the torsional phenomenon.

[0050] As a result, the cover portion 310 is arranged for each of the objects 10, and the objects 10 can be cooled individually. Therefore, regardless of the position arranged inside the chamber 200, all are cooled in the same manner, and since the objects 10 can be cooled in a pressed state, the uniformity of the cooling quality of the objects 10 can be ensured.

[0051] Here, the drive unit 700 may be provided outside the chamber 200 and may be provided as an actuator in which a linearly moving rod 710 penetrates the chamber 200.

[0052] Further, the coolant supply pipe 320 may be fastened to an end of the rod 710, connected to communicate with the plurality of cover portions 310, and connected to the coolant supply portions 510 and 520.

[0053] That is, the coolant supply pipe 320 has a hollow interior through which the coolant flows. When the coolant is supplied from the coolant supply portions 510 and 520, it is configured to branch and supply the coolant to each of the cover portions 310.

[0054] With such a configuration, when the drive unit 700 operates and the rod 710 moves, correspondingly, the coolant supply pipe 320 and the cover portion 310 both move in the vertical direction. When the coolant is supplied from the coolant supply portions 510 and 520 with the object 10 disposed inside the cover portion 310, the coolant is supplied to each of the plurality of cover portions 310 via the coolant supply pipe 320, so that the object 10 can be cooled individually.

[0055] Also, in the present invention, gas or oil can be used as the coolant supplied to the cover portion 310 to cool the object 10.

[0056] As an example, when gas is used as the coolant, the coolant supply portion 510 may include a coolant storage tank 511 in which the coolant is stored, a coolant supply line 512 connecting the coolant storage tank 511 and the chamber 200, and a flexible supply pipe 513 having one end fastened to the chamber 200 and connected to the coolant supply line 512 and the other end connected to the coolant supply pipe 320, the length of which is variable corresponding to the movement of the coolant supply pipe 320.

[0057] Further, the cooling medium supply unit 510 may include a cooling medium recovery tank 514 for recovering the cooling medium supplied to the chamber 200, and a cooling medium compressor 515 for compressing the cooling medium stored in the cooling medium recovery tank 514 and supplying it to the cooling medium storage tank 511. Also, pipes through which the cooling medium flows to connect the respective components may be provided with valves for opening and closing the pipes.

[0058] With such a configuration, when the object 10 is individually cooled through the cover portion 310, as shown in FIG. 7, when the cooling medium stored in the cooling medium storage tank 511 is supplied to the flexible supply pipe 513 provided inside the chamber 200 through the cooling medium supply line 512, the cooling medium is supplied to the cover portion 310 through the cooling medium supply pipe 320 to cool the object 10. Also, the cooling medium that has cooled the object 10 can be recovered into the cooling medium recovery tank 514, compressed by the cooling medium compressor 515, and then supplied to and recovered in the cooling medium storage tank 511.

[0059] Further, the chamber 200 may further include a vent portion 230 for discharging the cooling medium filled inside to the outside.

[0060] The vent portion 230 can be opened when the pressure exceeds a certain level to prevent the overpressure cooling medium from flowing into the chamber 200, and can operate to lower the pressure inside the chamber 200.

[0061] Alternatively, the vent portion 230 may be opened at the initial stage of supplying the cooling medium to the chamber 200 and may be kept open until the inside of the chamber 200 is completely replaced with the cooling medium. Thereby, it is possible to prevent gases or foreign matters other than the cooling medium from being mixed into the circulating cooling medium.

[0062] Further, when the cooling medium is a gas, the heat treatment cooling device 100 of the present invention may further include a common cooling unit 400 that injects the cooling medium into the chamber 200.

[0063] That is, the common cooling unit 400 may not be configured to directly inject the cooling medium into each of the objects 10, but may be configured to inject the cooling medium into the chamber 200 to cool the objects 10 provided inside the chamber 200 as a whole.

[0064] Therefore, the common cooling unit 400 may be provided inside the chamber 200 and may include a common cooling medium injection nozzle 410 that injects the cooling medium into the chamber 200, and a common cooling medium supply line 420 that connects the cooling medium storage tank 511 and the common cooling medium injection nozzle 410.

[0065] With such a configuration, when injecting the cooling medium into the chamber 200, as shown in FIG. 8, the cooling medium supply line 512 is closed, and when the cooling medium stored in the cooling medium storage tank 511 is supplied to the common cooling medium injection nozzle 410 provided inside the chamber 200 through the common cooling medium supply line 420, the cooling medium is injected into the chamber 200 through the common cooling medium injection nozzle 410 to cool the objects 10 in common. Further, the cooling medium that has cooled the objects 10 can be recovered into the cooling medium recovery tank 514, compressed by the cooling medium compressor 515, and then supplied to the cooling medium storage tank 511 for recovery.

[0066] Further, the cooling medium supply pipe 320 may be configured to be separable from the rod 710 of the driving unit 700. That is, when injecting and cooling the cooling medium into the chamber 200 through the common cooling unit 400, the cooling medium supply pipe 320 may be separated from the rod 710 so as not to be interfered with by the cooling medium supply pipe 320 and the cover unit 310, and then the cooling medium may be injected into the chamber 200.

[0067] As another example, when using oil as the cooling medium, referring to FIG. 9, the cooling medium supply unit 520 includes a cooling medium storage tank 521 in which the cooling medium is stored, a cooling medium supply line 522 connecting the cooling medium storage tank 521 and the chamber 200, a cooling medium supply pump 524 for supplying the cooling medium stored in the cooling medium storage tank 521 to the cooling medium supply pipe 320, and a flexible supply pipe 523 having one end fastened to the chamber 200 and connected to the cooling medium supply line 522 and the other end connected to the cooling medium supply pipe 320, the length of which is variable in correspondence with the movement of the cooling medium supply pipe 320.

[0068] Further, the cooling medium supply unit 520 may include a cooling medium recovery tank 525 for recovering the cooling medium supplied to the chamber 200, a cooling medium return pump 526 for supplying the cooling medium stored in the cooling medium recovery tank 525 to the cooling medium storage tank 521, and a cooling medium cooling unit 527 for cooling the oil stored in the cooling medium recovery tank 525. Here, the cooling medium cooling unit 527 may be provided as a chiller.

[0069] With such a configuration, when using oil as the cooling medium, as shown in FIG. 9, when the cooling medium supply pump 524 operates, the cooling medium stored in the cooling medium storage tank 511 is supplied to the flexible supply pipe 513 provided inside the chamber 200 through the cooling medium supply line 512, and then the cooling medium is supplied to the cover unit 310 through the cooling medium supply pipe 320 to cool the object 10. Also, the cooling medium that has cooled the object 10 is recovered in the cooling medium recovery tank 514, and when the cooling medium return pump 526 operates, it can be recovered in the cooling medium storage tank 511. Further, since the cooling medium recovered in the cooling medium storage tank 511 is in a heated state, the cooling medium stored in the cooling medium storage tank 511 can be cooled through the cooling medium cooling unit 527.

[0070] As described above, the present invention has been described in detail through specific embodiments. However, this is for specifically describing the present invention, and the present invention is not limited thereto. It is obvious that the present invention can be modified and improved by those with ordinary knowledge in the field within the technical idea of the present invention.

[0071] Any simple change or modification of the present invention belongs to the scope of the present invention, and the specific protection scope of the present invention will be clarified by the appended claims.

Explanation of Reference Numerals

[0072] 10: Object 20: Fixture Tray 21: Support Pin Through-Hole 40: Transfer Fixture 100: Cooling Device for Heat Treatment 200: Chamber 210: Object Support Portion 211: Support Pin 300: Individual Cooling Portion 310: Cover Portion 311: Cover Portion Body 312: Nozzle Portion 313: Pressurizing Pin 320: Cooling Medium Supply Pipe 400: Common Cooling Portion 410: Common Cooling Medium Injection Nozzle 420: Common Cooling Medium Supply Line 510: Cooling Medium Supply Portion 511: Cooling Medium Storage Tank 512: Cooling Medium Supply Line 513: Flexible Supply Pipe 514: Cooling Medium Recovery Tank 515: Cooling Medium Compressor 520: Cooling Medium Supply Portion 521: Cooling Medium Storage Tank 522: Cooling Medium Supply Line 523: Flexible Supply Pipe 524: Cooling Medium Supply Pump 525: Cooling Medium Recovery Tank 526: Cooling Medium Return Pump 527: Cooling Medium Cooling Portion 700: Driving Portion 710: Rod

Claims

1. A chamber into which a plurality of objects are loaded through an open side; An individual cooling unit provided in the chamber, covering the objects individually and injecting a cooling medium onto the objects; A driving unit provided in the chamber, moving the individual cooling unit in the vertical direction; comprising; A plurality of objects are arranged on a jig tray, and the jig tray is loaded into the chamber through a transfer jig and seated on an object support part provided in the chamber; The object support part; A plurality of support pins passing through the jig tray and supporting the objects; A cooling device for heat treatment, characterized by comprising the above.

2. The individual cooling unit; A cover part having a hollow interior so that the object is disposed therein and having one side open; A cooling medium supply pipe provided in the driving unit and moving in the vertical direction, fastened to the other side of the cover part and supplying a cooling medium into the cover part; A cooling medium supply part connected to the cooling medium supply pipe and supplying a cooling medium; The cooling device for heat treatment according to claim 1, characterized by comprising the above.

3. The cover part; A cover part body formed in a box shape with one side open and formed in a double-wall shape so that a cooling medium flows therein, and having an outer wall communicating with the cooling medium supply pipe; A nozzle part communicating with the inner wall of the cover part body, protruding inside the cover part body and injecting a cooling medium onto the object; The cooling device for heat treatment according to claim 2, characterized by comprising the above.

4. The cover part; A plurality of pressing pins protruding from the inner surface on the upper side of the cover part body and pressing the object; The cooling device for heat treatment according to claim 3, characterized by comprising the above.

5. After the jig tray descends and the objects are supported by the plurality of support pins and are spaced apart from the jig tray, the cover part descends and the objects are pressed by the plurality of pressing pins, and a cooling medium is injected through the nozzle part. The cooling device for heat treatment according to claim 4, characterized by the above.

6. The cooling medium supply part; A cooling medium storage tank in which a cooling medium is stored; A cooling medium supply line connecting the cooling medium storage tank and the chamber; A flexible supply pipe having one end fastened to the chamber and connected to the cooling medium supply line, and the other end connected to the cooling medium supply pipe, and having a variable length corresponding to the movement of the cooling medium supply pipe; The cooling device for heat treatment according to claim 2, characterized by including

7. When the cooling medium is gas, the cooling medium supply unit A cooling medium recovery tank for recovering the cooling medium supplied to the chamber, A cooling medium compressor for compressing the cooling medium stored in the cooling medium recovery tank and supplying it to the cooling medium storage tank, The cooling device for heat treatment according to claim 6, characterized by including

8. When the cooling medium is oil, the cooling medium supply unit A cooling medium supply pump for supplying the cooling medium stored in the cooling medium storage tank to the cooling medium supply pipe, A cooling medium recovery tank for recovering the cooling medium supplied to the chamber, A cooling medium return pump for supplying the cooling medium stored in the cooling medium recovery tank to the cooling medium storage tank, A cooling medium cooling unit for cooling the oil stored in the cooling medium recovery tank, The cooling device for heat treatment according to claim 6, characterized by including

9. When the cooling medium is gas, a common cooling unit for injecting the cooling medium into the chamber The cooling device for heat treatment according to claim 6, further characterized by including

10. The common cooling unit A common cooling medium injection nozzle provided inside the chamber for injecting the cooling medium into the chamber, A common cooling medium supply line connecting the cooling medium storage tank and the common cooling medium injection nozzle, The cooling device for heat treatment according to claim 9, characterized by including

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