Disc spring quenching treatment device

Abstract

The invention discloses a quenching treatment device for belleville springs and belongs to the technical field of belleville spring machining, an erecting assembly is driven by a supporting rod to rotate, the erecting assembly can drive a plurality of belleville springs to rotate, a plurality of rotating gears are in meshed connection with a gear ring, and the rotating gears can rotate and revolve around a center gear at the same time; the quenching heat treatment mechanism can conduct heat treatment on the belleville springs arranged outside the erecting assembly in a sleeving mode, the belleville springs are in a movable state, so that the belleville springs can be evenly heated, the heating effect cannot be affected by stacking or placing positions of the belleville springs, the product quality is guaranteed, and along with continuous rotation of the center gear, the service life of the belleville springs is prolonged. The belleville springs subjected to heat treatment can be moved out of the working area of the quenching heat treatment mechanism, the belleville springs to be subjected to heat treatment can be conveyed into the working area of the quenching heat treatment mechanism by the erecting assembly, the purpose of continuously carrying out heat treatment on the batched belleville springs is achieved, and then the machining efficiency of the belleville springs is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of disc spring processing, and in particular relates to a disc spring quenching treatment device. Background Art

[0002] The butterfly spring is a special spring for mechanical accessories that looks like a circular gasket but is made of different metals. The butterfly spring needs to be quenched during processing. The butterfly spring is placed in a heat treatment mechanism and heated to a quenching temperature above the critical point and maintained for a period of time. The butterfly spring is then taken out and placed in a quenching liquid to cool down, thereby increasing the toughness of the butterfly spring.

[0003] During the quenching process of disc springs, batches of disc springs are usually placed on racks and then sent to the quenching mechanism for heat treatment. After the heat treatment is completed, the disc springs are taken out for cooling. This process is complicated and affects the quenching efficiency of the disc springs. At the same time, the disc springs are heated in a static state. Some disc springs are easily affected by stacking or placement, resulting in uneven heating, which affects the quality of the product after quenching. Summary of the invention

[0004] In order to overcome the above-mentioned defects, the present invention provides a disc spring quenching treatment device, which solves the problem of placing batches of disc springs on a storage rack, then sending them into a quenching mechanism for heat treatment, and then taking them out for cooling after the heat treatment is completed. This process is complicated and affects the quenching efficiency of the disc springs. At the same time, the disc springs are heated in a static state, and some disc springs are easily affected by stacking or placement, resulting in uneven heating, thereby affecting the quality of the product after quenching.

[0005] The purpose of the present invention is to make the disc spring in an active state so that the disc spring can be evenly heated, and the heating effect will not be affected by the stacking or placement of the disc springs, so as to ensure the quality of the product. As the central gear continues to rotate, the disc springs that have completed the heat treatment can be moved out of the working area of ​​the quenching heat treatment mechanism, and the disc springs to be heat treated can be sent into the working area of ​​the quenching heat treatment mechanism by the mounting assembly, so as to achieve the purpose of continuously heat treating a batch of disc springs, thereby improving the processing efficiency of the disc springs.

[0006] The heated disc springs are quickly introduced into the quenching liquid for cooling. After the cooling work is completed, the mounting assembly continues to drive the disc springs to rotate and detach from the quenching box, so that the disc springs are located above the quenching box to facilitate the picking and placing of the disc springs. The traditional method of mounting batches of disc springs on a rack, then sending them into the quenching mechanism for heat treatment, and then taking them out for cooling after the heat treatment is completed is abandoned.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a disc spring quenching treatment device, comprising a quenching box, a support frame is provided on the quenching box, a quenching heat treatment mechanism is installed on the top of the support frame, a driving assembly is fixedly connected to the back of the support frame, the bottom of the driving assembly is fixedly connected in the quenching box, a supporting shaft is installed in the middle of the driving assembly, a central gear is clamped on the outside of the supporting shaft, a plurality of supporting assemblies are meshedly connected to the outside of the central gear, and a plurality of supporting assemblies are provided with gear rings on the outside;

[0008] One side of the gear ring is fixedly connected to the driving assembly, a protective cover is provided on the outer wall of the gear ring, the end of the support shaft is fixed to the middle part of the protective cover, a number of support assemblies are installed through the protective cover, a mounting assembly is connected to the outer cover of the support assembly, and a number of mounting assemblies are located below the quenching heat treatment mechanism, a circulation assembly is installed in the quenching box, and the circulation assembly passes through the quenching box and is installed on the back of the quenching box.

[0009] As a further solution of the present invention: a slideway is provided on the outer wall of the gear ring, a slip ring is slidably connected in the slideway, and the slip ring is fixedly connected to the inner wall of the protective cover.

[0010] As a further solution of the present invention: the driving assembly includes a support seat, the support seat is installed in the quenching box, one side of the support seat is fixed to the support frame, a motor is installed on the back of the support seat, a driving gear is fixedly connected to the output shaft of the motor, a driven gear is meshedly connected to the driving gear, and one side of the driven gear is fixedly connected to the end of the support shaft.

[0011] As a further solution of the present invention: the support assembly includes a support rod, one end of which is fixedly connected to a rotating gear, the rotating gear is meshingly connected to the central gear and the ring gear, the outer sleeve of the support rod is connected to a bearing seat, and the bearing seat is clamped on the protective cover.

[0012] As a further solution of the present invention: the top and bottom of the support rod are respectively provided with sliding grooves, the mounting assembly is sleeved on the outside of the support rod, the rotating gear is located in the protective cover, the number of the rotating gears is four, and the angle between two adjacent rotating gears is ninety degrees.

[0013] As a further solution of the present invention: the erection assembly includes a slide cylinder, which is sleeved on the outside of the support assembly, a baffle is installed on the end of the slide cylinder close to the protective cover, a plurality of protrusions are provided on the side of the outer wall of the slide cylinder away from the baffle, and the ends of the protrusions are arc-shaped, a nut is provided on the end of the slide cylinder away from the baffle, a locking screw is connected to the inner thread of the nut, the end of the locking screw is threadedly connected to the end of the support assembly, and a pull ring is provided on the other end of the locking screw.

[0014] As a further solution of the present invention: the circulation component includes two connecting pipes, which are respectively installed on both sides of the quenching box, and a plurality of branch pipes are provided outside the connecting pipes. One end of the connecting pipe passes through the quenching box and is equipped with a connecting head, and a cooling water pump and a condenser assembly are respectively installed on the two connecting heads. The condenser assembly is installed on the back of the quenching box, and the cooling water pump is installed on one side of the condenser assembly.

[0015] As a further solution of the present invention: one end of the connecting pipe away from the connecting head passes through the quenching box and is installed with a drain valve, grids are installed on both sides of the inner wall of the quenching box, and the connecting pipe and the branch pipe are located inside the grids.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In the present invention, the disc springs are sleeved outside a plurality of mounting components to control the operation of the motor and the quenching heat treatment mechanism. The motor drives the driven gear to rotate through the driving gear, and the driven gear drives the central gear and the protective cover to rotate. During the rotation of the central gear, a plurality of rotating gears are driven to rotate. The rotating gear drives the mounting components to rotate through the support rod. The mounting components drive a plurality of disc springs to rotate. Since a plurality of rotating gears are meshed and connected with the gear ring, and the gear ring is fixed on the support seat, the gear ring does not rotate. Therefore, the rotating gear can rotate while revolving around the central gear. When the mounting components are transferred When it reaches the working area of ​​the quenching heat treatment mechanism, the quenching heat treatment mechanism can perform heat treatment on the disc springs mounted outside the mounting assembly. Since the disc springs are in an active state, the disc springs can be heated evenly, and the heating effect will not be affected by the stacking or placement of the disc springs, thereby ensuring the quality of the product. As the center gear continues to rotate, the disc springs that have completed the heat treatment can be moved out of the working area of ​​the quenching heat treatment mechanism, and the disc springs to be heat treated can be sent into the working area of ​​the quenching heat treatment mechanism by the mounting assembly, thereby achieving the purpose of continuously heat treating batches of disc springs, thereby improving the processing efficiency of disc springs.

[0018] 2. In the present invention, the disc spring is driven to rotate by the mounting assembly. After the disc spring completes the heat treatment, the mounting assembly can drive the disc spring into the quenching box. Since the quenching box is filled with quenching liquid, the heated disc spring can be quickly introduced into the quenching liquid for cooling. After the cooling work is completed, the mounting assembly continues to drive the disc spring to rotate and detach from the quenching box, so that the disc spring is located above the quenching box, so as to facilitate the taking and placing operation of the disc spring. Since the temperature of the quenching liquid will rise during use, the cooling water pump is controlled to make the branch pipe on one of the connecting pipes extract the quenching liquid from the quenching box. After the quenching liquid is initially cooled by the cooling water pump, it can be introduced into the condenser assembly, so that the condenser assembly further cools the quenching liquid, and the cooled quenching liquid enters another connecting pipe and is re-introduced into the quenching box from the branch pipe, so that the quenching liquid in the quenching box can be circulated and cooled, thereby improving the quenching and cooling effect of the disc spring.

[0019] The locking screw is then rotated in the nut and released from the support rod, and the locking screw is then released from the nut and released from the support rod, thereby preventing the slide tube from rotating and affecting the adjustment of the locking screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the connection between the quenching box and the circulation component of the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the driving assembly of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the ring gear and the sun gear of the present invention;

[0024] Figure 5 It is a schematic structural diagram of the cross section of the protective cover of the present invention;

[0025] Figure 6 It is a structural schematic diagram of the erection assembly of the present invention;

[0026] Figure 7 It is a structural schematic diagram of the support assembly of the present invention;

[0027] In the figure: 1. quenching box; 2. support frame; 3. quenching heat treatment mechanism; 4. driving assembly; 401. support seat; 402. motor; 403. driving gear; 404. driven gear; 5. supporting shaft; 6. central gear; 7. supporting assembly; 701. supporting rod; 702. bearing seat; 703. rotating gear; 704. slide groove; 8. gear ring; 9. protective cover; 10. slip ring; 11. slideway; 12. erection assembly; 121. slide cylinder; 122. baffle; 123. bump; 124. nut; 125. locking screw; 13. circulation assembly; 131. connecting pipe; 132. branch pipe; 133. connector; 134. cooling water pump; 135. condenser assembly; 14. grid; 15. drain valve. DETAILED DESCRIPTION

[0028] The technical solution of the present application is further described in detail below in conjunction with specific implementation methods.

[0029] like Figure 1-7 As shown, the present invention provides a technical solution: a disc spring quenching treatment device, including a quenching box 1, a support frame 2 is provided on the quenching box 1, a quenching heat treatment mechanism 3 is installed on the top of the support frame 2, a driving component 4 is fixedly connected to the back of the support frame 2, the bottom of the driving component 4 is fixedly connected in the quenching box 1, a support shaft 5 is installed in the middle of the driving component 4, a central gear 6 is clamped on the outside of the support shaft 5, and a plurality of support components 7 are meshingly connected to the outside of the central gear 6.

[0030] Among them, Figure 2 As shown, several erection components 12 are located below the quenching heat treatment mechanism 3, a circulation component 13 is installed in the quenching box 1, the circulation component 13 passes through the quenching box 1 and is installed on the back of the quenching box 1, the circulation component 13 includes two connecting pipes 131, the two connecting pipes 131 are respectively installed on both sides of the quenching box 1, and a plurality of branch pipes 132 are arranged outside the connecting pipe 131, one end of the connecting pipe 131 passes through the quenching box 1 and is installed with a connector 133, a cooling water pump 134 and a condenser component 135 are respectively installed on the two connectors 133, the condenser component 135 is installed on the back of the quenching box 1, and the cooling water pump 134 is installed on one side of the condenser component 135. Through the mutual cooperation between the cooling water pump 134 and the condenser component 135, the quenching liquid can be introduced into the condenser component 135 after being initially cooled by the cooling water pump 134, so that the condenser component 135 further cools the quenching liquid, thereby improving the cooling effect of the quenching liquid;

[0031] One end of the connecting pipe 131 away from the connecting head 133 passes through the quenching box 1 and is equipped with a drain valve 15. Grids 14 are respectively installed on both sides of the inner wall of the quenching box 1. The connecting pipe 131 and the branch pipe 132 are located inside the grid 14. The setting of the drain valve 15 facilitates the discharge of the quenching liquid in the quenching box 1. The setting of the grid 14 can prevent foreign objects from colliding with the connecting pipe 131 and affecting its normal operation.

[0032] like Figure 3 As shown, one side of the ring gear 8 is fixedly connected to the driving component 4, and the driving component 4 includes a support base 401, which is installed in the quenching box 1, one side of the support base 401 is fixed to the support frame 2, and a motor 402 is installed on the back of the support base 401. A driving gear 403 is fixedly connected to the output shaft of the motor 402, and a driven gear 404 is meshed with the driving gear 403, and one side of the driven gear 404 is fixedly connected to the end of the support shaft 5.

[0033] like Figure 4-5 Several support assemblies 7 are shown as being provided with a gear ring 8 outside, a slideway 11 is provided on the outer wall of the gear ring 8, a slip ring 10 is slidably connected inside the slideway 11, a protective cover 9 is provided on the outer wall of the gear ring 8, the end of the support shaft 5 is fixed to the middle of the protective cover 9, and several support assemblies 7 are installed through the protective cover 9. The slip ring 10 is fixedly connected to the inner wall of the protective cover 9, and through the mutual cooperation between the slideway 11 and the slip ring 10, the slideway 11 can limit the slip ring 10, thereby improving the rotation stability of the protective cover 9.

[0034] like Figure 6 As shown, the support component 7 is externally connected with a mounting component 12, and the mounting component 12 includes a slide 121, which is sleeved on the outside of the support component 7, and a baffle 122 is installed at one end of the slide 121 close to the protective cover 9, and a plurality of protrusions 123 are provided on the side of the outer wall of the slide 121 away from the baffle 122, and the end of the protrusion 123 is designed in an arc shape, and the mutual cooperation between the baffle 122 and the protrusion 123 can prevent the butterfly spring from falling off the slide 121 during the movement, and because the end of the protrusion 123 is designed in an arc shape, the butterfly spring can slide on the top of the protrusion 123 and detach from the slide 121, which will not affect the taking and placing of the butterfly spring.

[0035] like Figure 7 As shown, the support assembly 7 includes a support rod 701, one end of which is fixedly connected to a rotating gear 703, which is meshingly connected to the center gear 6 and the ring gear 8, and a bearing seat 702 is connected to the outer sleeve of the support rod 701, and the bearing seat 702 is clamped on the protective cover 9. Because the protective cover 9 is provided, the protective cover 9 covers one side of the support seat 401, thereby protecting the center gear 6, the rotating gear 703 and the ring gear 8.

[0036] The top and bottom of the support rod 701 are respectively provided with sliding grooves 704, the mounting assembly 12 is sleeved on the outside of the support rod 701, the rotating gear 703 is located in the protective cover 9, the number of the rotating gears 703 is four, and the angle between two adjacent rotating gears 703 is ninety degrees. Because the raised part of the inner wall of the slide cylinder 121 is embedded in the slideway 11 outside the support rod 701, it can play a role in limiting the slide cylinder 121 and prevent the slide cylinder 121 from rotating and affecting the adjustment locking screw 125.

[0037] A nut 124 is provided at one end of the slide 121 away from the baffle 122, and a locking screw 125 is connected to the inner thread of the nut 124. The end of the locking screw 125 is threadedly connected to the end of the support assembly 7, and a pull ring is provided at the other end of the locking screw 125. Due to the provision of the locking screw 125, when the support rod 701 and the slide 121 are separated, the locking screw 125 can be separated from the support rod 701 during the reverse rotation process, which is convenient for releasing the locking state of the support rod 701 and the slide 121. The locking screw 125 can be embedded in the support rod 701 when it rotates forward, so as to lock the support rod and the slide 121, thereby preventing the slide 121 from sliding freely and affecting the processing stability.

[0038] The working principle of the present invention is:

[0039] When in use, the disc springs are sleeved on the outside of multiple mounting components 12, and the motor 402 drives the driven gear 404 to rotate through the driving gear 403, and the driven gear 404 drives the center gear 6 and the protective cover 9 to rotate. During the rotation of the center gear 6, it will drive multiple rotating gears 703 to rotate, and the rotating gear 703 will drive the mounting components 12 to rotate through the support rod 701. The mounting components 12 will drive multiple disc springs to rotate, and the rotating gear 703 can rotate while revolving around the center gear 6.

[0040] When the mounting assembly 12 is transferred to the working area of ​​the quenching heat treatment mechanism 3, the quenching heat treatment mechanism 3 can perform heat treatment on the disc springs mounted outside the mounting assembly 12, and the disc springs are in an active state, so that the disc springs can be heated evenly. As the center gear 6 continues to rotate, the disc springs that have completed the heat treatment can be moved out of the working area of ​​the quenching heat treatment mechanism 3, and the disc springs to be heat treated can be sent into the working area of ​​the quenching heat treatment mechanism 3 by the mounting assembly 12, so that batches of disc springs can be heat treated continuously.

[0041] After the disc spring completes the heat treatment, the mounting assembly 12 can drive the disc spring into the quenching box 1. Because the quenching box 1 is filled with quenching liquid, the heated disc spring can be quickly introduced into the quenching liquid for cooling. After the cooling work is completed, the mounting assembly 12 continues to drive the disc spring to rotate and disengage from the quenching box 1, so that the disc spring is located above the quenching box 1, and the pull ring rotates the locking screw 125, so that the locking screw 125 can rotate in the nut 124 and disengage from the support rod 701. Pulling the pull ring can drive the slide 121 to slide outside the support rod 701. During the movement, the slide 121 can drive the disc spring to move toward the front of the quenching box 1 to expand the operating space. Secondly, all the disc springs can be directly pulled down to complete the disassembly work. When placing the disc spring, the disc spring can be sleeved on the outside of the slide 121. The setting of the baffle 122 and the protrusion 123 outside the slide 121 can prevent the disc spring from falling off the slide 121 during the movement.

[0042] The temperature of the quenching liquid will rise during use. By controlling the operation of the cooling water pump 134, the branch pipe 132 on one of the connecting pipes 131 draws the quenching liquid from the quenching box 1. After preliminary cooling by the cooling water pump 134, the quenching liquid can be introduced into the condenser assembly 135, so that the condenser assembly 135 further cools the quenching liquid. The cooled quenching liquid then enters another connecting pipe 131 and is re-introduced into the quenching box 1 from the branch pipe 132, so that the quenching liquid in the quenching box 1 can be circulated and cooled.

[0043] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one scheme", "some schemes", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the scheme or example are included in at least one scheme or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same scheme or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more schemes or examples in a suitable manner.

Claims

1. A disc spring quenching treatment device, comprising a quenching box (1), characterized in that: The quenching box (1) is provided with a support frame (2), a quenching heat treatment mechanism (3) is installed on the top of the support frame (2), a driving assembly (4) is fixedly connected to the back of the support frame (2), the bottom of the driving assembly (4) is fixedly connected to the quenching box (1), a support shaft (5) is installed in the middle of the driving assembly (4), the support shaft (5) is externally clamped with a central gear (6), the central gear (6) is externally meshed with a plurality of support assemblies (7), and a plurality of support assemblies (7) are externally provided with gear rings (8); One side of the gear ring (8) is fixedly connected to the driving component (4), the outer wall of the gear ring (8) is provided with a protective cover (9), the end of the support shaft (5) is fixed to the middle of the protective cover (9), a plurality of support components (7) are installed through the protective cover (9), the outer cover of the support component (7) is connected with a mounting component (12), and the plurality of mounting components (12) are located below the quenching heat treatment mechanism (3), and a circulation component (13) is installed in the quenching box (1), and the circulation component (13) passes through the quenching box (1) and is installed on the back of the quenching box (1).

2. A disc spring quenching treatment device according to claim 1, characterized in that: The outer wall of the gear ring (8) is provided with a slideway (11), a slip ring (10) is slidably connected inside the slideway (11), and the slip ring (10) is fixedly connected to the inner wall of the protective cover (9).

3. A disc spring quenching treatment device according to claim 1, characterized in that: The driving assembly (4) comprises a support seat (401), the support seat (401) is installed in the quenching box (1), one side of the support seat (401) is fixed to the support frame (2), a motor (402) is installed on the back of the support seat (401), a driving gear (403) is fixedly connected to the output shaft of the motor (402), a driven gear (404) is meshedly connected to the driving gear (403), and one side of the driven gear (404) is fixedly connected to the end of the support shaft (5).

4. The disc spring quenching treatment device according to claim 1, characterized in that: The support assembly (7) comprises a support rod (701), one end of which is fixedly connected to a rotating gear (703), the rotating gear (703) being meshingly connected to the central gear (6) and the ring gear (8), the outer shell of the support rod (701) being connected to a bearing seat (702), and the bearing seat (702) being clamped on the protective cover (9).

5. A disc spring quenching treatment device according to claim 4, characterized in that: The top and bottom of the support rod (701) are respectively provided with a slide groove (704), the mounting assembly (12) is sleeved on the outside of the support rod (701), the rotating gear (703) is located in the protective cover (9), the number of the rotating gears (703) is four, and the angle between two adjacent rotating gears (703) is ninety degrees.

6. The disc spring quenching treatment device according to claim 1, characterized in that: The erection assembly (12) comprises a slide (121), wherein the slide (121) is sleeved on the outside of the support assembly (7), a baffle (122) is installed at one end of the slide (121) close to the protective cover (9), a plurality of protrusions (123) are provided on the side of the outer wall of the slide (121) away from the baffle (122), the end of the protrusion (123) is designed to be arc-shaped, a nut (124) is provided at one end of the slide (121) away from the baffle (122), a locking screw (125) is connected to the inner thread of the nut (124), the end of the locking screw (125) is threadedly connected to the end of the support assembly (7), and a pull ring is provided at the other end of the locking screw (125).

7. The disc spring quenching treatment device according to claim 1, characterized in that: The circulation component (13) comprises two connecting pipes (131), the two connecting pipes (131) are respectively installed on both sides of the quenching box (1), a plurality of branch pipes (132) are arranged outside the connecting pipe (131), one end of the connecting pipe (131) passes through the quenching box (1) and is installed with a connecting head (133), a cooling water pump (134) and a condenser component (135) are respectively installed on the two connecting heads (133), the condenser component (135) is installed on the back of the quenching box (1), and the cooling water pump (134) is installed on one side of the condenser component (135).

8. The disc spring quenching treatment device according to claim 7, characterized in that: One end of the connecting pipe (131) away from the connecting head (133) passes through the quenching box (1) and is installed with a drain valve (15); grid frames (14) are respectively installed on both sides of the inner wall of the quenching box (1); and the connecting pipe (131) and the branch pipe (132) are located inside the grid frames (14).

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