Quick-change type metal plate table for punching back plate of refrigerator

Abstract

The invention relates to the technical field of refrigerator back plate blanking, in particular to a quick-change type refrigerator back plate blanking metal plate table which comprises a workbench, a punch quick-change mechanism is arranged in an inner cavity of the workbench and comprises a die horizontally connected to the inner cavity of the workbench in a sliding mode, and the die is driven by an electric telescopic rod. At least three mold grooves for containing refrigerator back plates of different sizes and specifications are formed in an inner cavity of the mold at equal intervals in a penetrating mode, racks are fixedly installed on the two sides of the mold, and a third gear meshed with the racks is rotationally connected to the middle of the inner cavity of the fixing frame on the workbench. Punches corresponding to the sizes and specifications of the three die grooves are arranged at the bottom end of the third gear in a floating mode, and a measuring assembly for measuring the size of the refrigerator back plate is arranged on the portion, on one side of the workbench, of the conveying belt. When refrigerator back plates of different sizes and specifications are punched, dies and punches of corresponding specifications can be quickly replaced according to the sizes and specifications of the refrigerator back plates, and therefore the overall working efficiency of equipment can be improved conveniently.

Description

Technical Field

[0001] The invention relates to the technical field of punching a refrigerator back plate, in particular to a sheet metal table for punching a quick-change refrigerator back plate. Background Art

[0002] The processing of the refrigerator back panel requires two processing steps. The first step is embossing, corner cutting, and punching, which is completed by the punching die. The second step is flanging, embossing, and punching, which is completed by the flanging die.

[0003] In the prior art, there is a utility model patent with a publication (announcement) number of CN209664063U and a name of a sheet metal processing mold for adjusting the blanking size of a refrigerator back panel. The utility model patent comprises an upper die base and a lower die base, and fixed ribs of the same specifications are welded on the outer walls on both sides of the bottom of the upper die base, and limiting grooves are opened on the outer walls on the side where the two fixed ribs face each other, and ears are inserted inside the limiting grooves, and a mold base plate is fixedly installed on the outer walls on the side where the two ears face each other, and drop punches distributed at equal distances are fixedly installed on the outer wall of the bottom of the mold base plate, and a limiting mechanism is fixedly arranged on the outer wall at one end of the two fixed ribs, and a gasket is bonded to the outer wall at the top of the mold base plate; the limiting plates arranged in four different directions of the upper die base of the utility model can realize the fixed clamping of workpieces of different specifications, improve the flexibility of the sheet metal mold adjustment, facilitate the installation and replacement of the mold base plate, and cooperate with the limiting mechanism to stably and reliably fix the mold base plate.

[0004] The equipment of this patent is convenient for punching refrigerator back panels of different sizes and specifications, thereby meeting the needs of the staff; however, the equipment of this patent still has the following technical defects during use: (1) When punching refrigerator back panels of different sizes and specifications, the equipment of this patent needs to know the specifications of the refrigerator back panels to be punched in advance and then replace the punch and mold of the corresponding specifications, and then fix it with the mold before punching it. The overall operation steps are relatively cumbersome, which not only wastes a lot of time of the staff but also reduces the overall work efficiency of the equipment; (2) When punching the refrigerator back panel, the equipment of this patent needs to be manually loaded and unloaded throughout the process, which increases the labor burden of the staff and is inconvenient to meet the needs of the staff. Summary of the invention

[0005] The purpose of the present invention is to provide a sheet metal table for punching a back plate of a quick-change refrigerator.

[0006] The technical problems solved by the present invention are:

[0007] (1) The existing equipment is inconvenient to quickly change the mold and punch of corresponding specifications according to the refrigerator back panels of different sizes;

[0008] (2) The existing equipment is inconvenient to load and unload materials when punching the back panel of the refrigerator.

[0009] The present invention can be implemented through the following technical scheme: a sheet metal table for punching a refrigerator back panel with a quick change type, comprising a workbench, an inner cavity of the workbench is provided with a punch quick change mechanism, the punch quick change mechanism comprises a mold horizontally slidably connected to the inner cavity of the workbench, the mold is driven by an electric telescopic rod, the inner cavity of the mold is penetrated by at least three mold grooves equidistantly provided to accommodate refrigerator back panels of different sizes, racks are fixedly installed on both sides of the mold, a third gear meshing with the rack is rotatably connected to the middle of the inner cavity of the fixed frame on the workbench, a punch corresponding to the size of the three mold grooves is floating at the bottom end of the third gear, a measuring component for measuring the size of the refrigerator back panel is provided on the conveyor belt on one side of the workbench, the measuring component comprises two centering plates symmetrically elastically slidably connected to the conveyor belt, a distance sensor electrically connected to the electric telescopic rod is fixedly installed on the side of the two centering plates away from each other, the arrangement of the two centering plates is convenient for correcting the deviation of the refrigerator back panel on the conveyor belt, and it is also convenient to determine the size of the refrigerator back panel through the distance sensor fixedly connected thereon.

[0010] A further technical improvement of the present invention is that a limit piece for limiting the centering plate is arranged on the bracket of the conveyor belt, the limit piece includes an outer sleeve fixedly connected to the bracket, the inner cavity of the outer sleeve is elastically and slidably connected to an inner sleeve fixedly connected to the centering plate, the outer wall of the inner sleeve is elastically and slidably connected to at least one arc-shaped limit block abutting against the inner wall of the outer sleeve, and the inner wall of the outer sleeve is equidistantly provided with at least three limit grooves matching the arc-shaped limit blocks, when the centering plate is not completely squeezed by the rear cover of the refrigerator, the arc-shaped limit block in the inner sleeve is always in a state of abutting against the inner wall of the outer sleeve, at this time, the spring on one side of the arc-shaped limit block is in a compressed state; when the centering plate is completely squeezed by the rear cover of the refrigerator, the arc-shaped limit block in the outer sleeve will enter the corresponding limit groove, at this time, the spring on one side of the arc-shaped limit block is in a normal state.

[0011] A further technical improvement of the present invention is that a lever is fixedly installed on the outer wall of the arc limit block, and the side of the lever away from the arc limit block sequentially passes through the inner sleeve and the outer sleeve and extends to the front side of the outer sleeve. The relative movement of the two levers facilitates the resetting of the outer sleeve, thereby facilitating the subsequent use of the equipment.

[0012] A further technical improvement of the present invention is that: sliders are fixedly installed on both sides of the arc-shaped limit block, the inner cavity of the inner sleeve is provided with a sliding groove for the sliding of the slider, and a trigger switch corresponding to the slider is fixedly installed on the inner wall of the sliding groove. The trigger switch is electrically connected to the distance sensor, and the trigger switch is used to control the opening and closing of the distance sensor.

[0013] A further technical improvement of the present invention is that the inner cavity of each mold groove is symmetrically and slidingly connected with two clamping plates, and flexible pads are fixedly installed on the opposite sides of the two clamping plates. The flexible pads are preferably rubber pads. The setting of the rubber pads facilitates the back panel of the refrigerator to avoid damage during transportation.

[0014] A further technical improvement of the present invention is that the inner cavity of the mold is provided with a driving member that enables the two clamping plates to move relative to each other. The driving member includes a bidirectional screw rotatably connected to the inner cavity of the mold. Both sections of the external threads of the bidirectional screw with opposite thread rotation directions are threadedly sleeved with screw sleeves fixedly connected to the clamping plates. Rotating the bidirectional screw enables the two screw sleeves to move relative to each other.

[0015] A further technical improvement of the present invention is that a button is fixedly installed at the bottom end of the inner wall of the workbench, the button is electrically connected to a driving motor that drives the bidirectional screw to rotate, and the button is used to control the opening and closing of the driving motor.

[0016] A further technical improvement of the present invention is that a collection box for receiving the rear cover of the refrigerator after punching is arranged on the support leg of the conveyor belt.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention enters the conveyor belt through the back plate of the refrigerator. Due to the different sizes of the back plate of the refrigerator, the two centering plates will be pushed at different distances. The inner sleeve of the inner cavity of the outer sleeve moves synchronously through the pushing of the two centering plates. The arc-shaped limit block of the inner cavity of the inner sleeve can enter the inner cavity of the corresponding limit groove through the movement of the inner sleeve. At this time, the slider will be connected with the trigger switch, and then the distance sensor is driven to operate through the trigger switch. The distance sensor is convenient for automatically measuring the size of the back plate of the refrigerator. After the size is determined, it is convenient to transmit it to the electric telescopic rod through the distance sensor. By controlling the distance of the electric telescopic rod, the corresponding mold groove in the mold can better receive the back plate of the refrigerator. At the same time, the sliding of the mold makes it convenient to rotate the punch of the corresponding specification to the top of the back plate of the refrigerator, so that the equipment can quickly change the mold and punch of the corresponding specification according to the size of the back plate of the refrigerator when punching the back plates of refrigerators with different sizes, thereby facilitating the improvement of the overall working efficiency of the equipment and conveniently meeting the use needs of the staff.

[0019] 2. The present invention facilitates the loading of the refrigerator back panel through the operation of the conveyor belt. After the punching work is completed, the punched refrigerator back panel can be located above the collection box through the sliding of the mold, and then the limit of the punched refrigerator back panel is released, thereby facilitating the unloading of the punched refrigerator back panel. The loading and unloading of the refrigerator back panel is completed by adopting mechanized operation, which is beneficial to reducing the labor intensity of the staff and thus facilitating the use of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a top view structural connection diagram of the bracket of the present invention;

[0023] Figure 3 It is a schematic diagram of the internal structure connection of the measuring piece of the present invention;

[0024] Figure 4 For the present invention Figure 3 A partial enlarged view of the middle A;

[0025] Figure 5 It is a schematic diagram of the three-dimensional structure connection of the workbench of the present invention;

[0026] Figure 6 It is a top view structural connection diagram of the workbench of the present invention;

[0027] Figure 7 For the present invention Figure 6 A partial enlarged view of point B in the middle;

[0028] Figure 8 It is a schematic diagram of the structural connection of the fixing frame of the present invention when viewed from above.

[0029] In the figure:

[0030] 1. Workbench; 11. Mold; 12. Mold groove; 13. Clamping plate; 14. Button; 15. Fixed frame; 16. Linkage rotating rod; 17. First gear; 18. Rack; 19. Second gear; 110. Third gear; 111. Rotating rod; 112. Annular sleeve; 113. Connecting plate; 114. Hydraulic cylinder; 115. Punch;

[0031] 2. Bracket; 21. Conveyor belt; 22. Guide plate; 23. Support plate; 24. Centering plate; 25. Measuring piece; 251. Outer sleeve; 252. Inner sleeve; 253. Inner groove; 254. Arc stop block; 255. Stop groove; 256. Sliding block; 257. Sliding groove; 258. Trigger switch; 259. Distance sensor; 2510. Lever;

[0032] 3. Driving motor; 31. Bidirectional screw; 32. Screw sleeve;

[0033] 4. Through slot;

[0034] 5. Collection box;

[0035] 6. Electric telescopic rod. DETAILED DESCRIPTION

[0036] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0037] See also Figure 1-2 As shown, the sheet metal table for punching the back panel of a quick-change refrigerator includes a workbench 1. A loading mechanism for facilitating the loading of the back panel of the refrigerator is arranged on one side of the workbench 1. The loading mechanism includes a bracket 2 fixedly connected to one side of the workbench 1. A conveyor belt 21 is arranged between the two inner side walls of the bracket 2. A servo motor for driving the conveyor belt 21 is fixedly installed on the back of the bracket 2.

[0038] See also Figure 2-4 As shown, a centering component for measuring the size of the back plate of the refrigerator is provided on the bracket 2, and the centering component includes two support plates 23 symmetrically fixed on the bracket 2, and a measuring piece 25 is provided on the opposite sides of the two support plates 23, and the measuring piece 25 includes an outer sleeve 251 fixedly connected to the middle end of one side of the support plate 23, and the inner cavity of the outer sleeve 251 is elastically slidably connected to the inner sleeve 252, and a centering plate 24 is fixedly installed on the side of the inner sleeve 252 away from the outer sleeve 251, and the number of the centering plates 24 is two, and the two centering plates 24 are arranged in an eight-shaped shape on the conveyor belt 21;

[0039] The outer wall of the inner sleeve 252 is provided with at least one inner groove 253, and the inner cavity of the inner groove 253 is elastically slidably connected with an arc-shaped limit block 254 that abuts against the inner wall of the outer sleeve 251. The inner wall of the outer sleeve 251 is provided with at least three limit grooves 255 that match the arc-shaped limit block 254. The three limit grooves 255 are equidistantly arranged. Slide blocks 256 are fixedly installed on both sides of the arc-shaped limit block 254. The inner cavity of the inner sleeve 252 is provided with a sliding groove 257 for the slider 256 to slide. The inner wall of the sliding groove 257 is fixedly installed with a trigger switch 258 that corresponds to the slider 256 one by one. The outer peripheral wall of the inner sleeve 252 is fixedly installed with a trigger switch 258 that corresponds to the trigger The distance sensor 259 electrically connected to the switch 258 enters the conveyor belt 21 through the back plate of the refrigerator. Due to the different sizes of the back plate of the refrigerator, the two centering plates 24 are pushed at different distances. The inner sleeve 252 in the inner cavity of the outer sleeve 251 moves synchronously through the pushing of the two centering plates 24. The arc-shaped limit block 254 in the inner cavity of the inner sleeve 252 can enter the inner cavity of the corresponding limit groove 255 through the movement of the inner sleeve 252. At this time, the slider 256 is connected to the trigger switch 258, and then the distance sensor 259 is driven to operate through the trigger switch 258. The distance sensor 259 is convenient for automatically measuring the size of the back plate of the refrigerator;

[0040] A lever 2510 is fixedly mounted on the outer wall of the arc-shaped limit block 254 . The side of the lever 2510 away from the arc-shaped limit block 254 passes through the inner sleeve 252 and the outer sleeve 251 in sequence and extends to the front side of the outer sleeve 251 .

[0041] See also Figure 2 , 5 As shown, the inner cavity of the workbench 1 is horizontally slidably connected to the mold 11, and the inner cavity of the workbench 1 away from the bracket 2 is fixedly installed with an electric telescopic rod 6, the output end of the electric telescopic rod 6 is fixedly connected to the mold 11, and the electric telescopic rod 6 is electrically connected to the distance sensor 259;

[0042] The inner cavity of the mold 11 is equidistantly penetrated with at least three mold grooves 12 for accommodating refrigerator back panels of different sizes, and the inner cavity of each mold groove 12 is symmetrically slidably connected to two clamping plates 13;

[0043] A guide plate 22 is fixedly installed between the two inner side walls of the bracket 2 to transport the refrigerator back panel on the conveyor belt 21 to the corresponding mold groove 12.

[0044] See also Figure 5-8 As shown, the inner cavity of the mold 11 is provided with a driving mechanism that enables the two clamping plates 13 to move relative to each other, and the driving mechanism includes a bidirectional screw 31 rotatably connected to the inner cavity of the mold 11, and a driving motor 3 that drives the bidirectional screw 31 to rotate is fixedly installed on the outer wall of the mold 11, and two sections of external threads with opposite thread rotation directions are provided on one side of the bidirectional screw 31 near the end, and the outer peripheral walls of the two sections of the external threads of the bidirectional screw 31 are threadedly sleeved with screw sleeves 32 that are slidably connected to the inner cavity of the workbench 1, and the screw sleeves 32 are fixedly connected to the clamping plate 13 near the opening of the workbench 1, and the clamping plate 13 located in the die groove 12 at the middle end of the mold 11 is fixedly connected to the clamping plate 13 near the opening of the workbench 1 through an inclined rod. Similarly, the clamping plate 13 located in the die groove 12 at the tail end of the mold 11 is fixedly connected to the clamping plate 13 located in the die groove 12 at the middle end of the mold 11 through an inclined rod.

[0045] A button 14 is fixedly mounted at the bottom end of the inner wall of the workbench 1, and the button 14 is electrically connected to the driving motor 3. A through groove 4 is formed through the bottom wall of the mold 11, and the depth of the through groove 4 is higher than the height of the button 14, thereby preventing the mold 11 from accidentally touching the button 14 when sliding.

[0046] A fixing frame 15 is fixedly installed on the workbench 1, and racks 18 are fixedly installed on both sides of the mold 11. The bottom end of the inner wall of the workbench 1 is rotatably connected to a first gear 17 meshing with the rack 18. A linkage rotating rod 16 is fixedly installed at the axis of the first gear 17. The end of the linkage rotating rod 16 away from the inner wall of the workbench 1 passes through the workbench 1 and extends to the top of the workbench 1. The end of the linkage rotating rod 16 extending to the top of the workbench 1 is rotatably connected to the top of the inner wall of the fixing frame 15. The middle part of the top of the inner wall of the fixing frame 15 is rotatably connected to a rotating rod 111. The outer peripheral wall of the rotating rod 111 is fixedly sleeved with a third gear. Wheel 110, the top end of the outer peripheral wall of the linkage rotating rod 16 is fixedly sleeved with a second gear 19 meshing with the third gear 110, the outer peripheral wall of the rotating rod 111 and located below the third gear 110 is fixedly sleeved with an annular sleeve 112, the outer peripheral wall of the annular sleeve 112 is fixedly mounted with at least three connecting plates 113, the three connecting plates 113 are equidistantly distributed in a circular array on the outer peripheral wall of the annular sleeve 112, the bottom ends of the three connecting plates 113 are fixedly mounted with hydraulic cylinders 114 corresponding to the size specifications of the three die grooves 12, and the output ends of the three hydraulic cylinders 114 are respectively fixedly mounted with corresponding punches 115.

[0047] See also Figure 1 As shown, a collection box 5 for receiving the rear cover of the refrigerator after punching is provided on the supporting leg of the bracket 2.

[0048] When the present invention is in use, the refrigerator back plate to be punched is directly placed on the conveyor belt 21, and the conveyor belt 21 is driven by the servo motor to facilitate the operation of the conveyor belt 21. The operation of the conveyor belt 21 facilitates the transportation of the refrigerator back plate. During the transportation of the refrigerator back plate, due to the different sizes of the refrigerator back plates to be punched, the refrigerator back plates to be punched will squeeze the two centering plates 24 to different degrees. When the centering plates 24 are squeezed, the inner sleeve 252 will slide in the inner cavity of the outer sleeve 251 until the arc-shaped limit block 254 elastically slidably connected to the inner cavity of the outer sleeve 251 enters the limit groove 255 corresponding to the inner wall of the outer sleeve 251. With the movement of the arc-shaped limit block 254, the slider 256 fixedly connected thereto is driven to move synchronously. The movement of the slider 256 makes the slider 256 contact the trigger switch 258. Since the trigger switch 258 is electrically connected to the distance sensor 259, the distance sensor 259 will be operated at this time. The distance can be detected by the distance sensor 259, so that the size of the refrigerator back plate to be punched can be indirectly known.

[0049] The signal is then transmitted to the electric telescopic rod 6 through the distance sensor 259. The driving of the electric telescopic rod 6 facilitates the sliding of the mold 11 in the inner cavity of the workbench 1. The sliding of the mold 11 facilitates the pushing of the mold groove 12 of the size specification corresponding to the back plate of the refrigerator to be punched to the middle end of the workbench 1, which facilitates the subsequent punching. The guidance of the guide plate 22 facilitates the delivery of the back plate of the refrigerator to be punched to the inner cavity of the corresponding mold groove 12. The back plate of the refrigerator to be punched enters the corresponding mold groove 12 and squeezes the button 14. At this time, the button 14 enables the driving motor 3 to operate, and the bidirectional screw 31 is rotated by the driving motor 3. Since the threads of the outer peripheral wall of the bidirectional screw 31 are two sections with opposite rotation directions, the two screw sleeves 32 are driven to move relative to each other through the thread transmission action, and the movement of the two screw sleeves 32 drives the two clamping plates 13 to fix the back plate of the refrigerator to be punched. Fixing it facilitates the punching accuracy of the equipment.

[0050] When the mold 11 slides, the racks 18 fixedly connected on both sides thereof will slide synchronously. Since the racks 18 mesh with the first gear 17, the sliding of the racks 18 drives the first gear 17 to rotate, and the rotation of the first gear 17 drives the linkage rotating rod 16 to rotate synchronously, thereby driving the second gear 19 to rotate. Since the second gear 19 meshes with the third gear 110, the third gear 110 will also rotate at this time. The rotation of the third gear 110 facilitates the rotation of the punch 115 of the corresponding specification to the top of the back plate of the refrigerator to be punched. Finally, the punching work can be completed by driving the corresponding hydraulic cylinder 114.

[0051] After the punching work is completed, the electric telescopic rod 6 is manually driven again to slide the mold 11. The sliding of the mold 11 allows the punched refrigerator back panel to be located above the collection box 5, and then the limit of the punched refrigerator back panel is released, thereby facilitating the unloading of the punched refrigerator back panel, thereby reducing the labor intensity of the staff and meeting the staff's usage needs.

[0052] When the device is used for the second time, the inner sleeve 252 can be reset by the relative movement of the two levers 2510. After reset, the accuracy of the device measurement can be ensured, thereby facilitating the continuous use of the device.

[0053] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A sheet metal table for punching a back panel of a quick-change refrigerator, comprising a workbench (1), characterized in that: The inner cavity of the workbench (1) is provided with a punch quick-change mechanism, the punch quick-change mechanism comprising a mold (11) horizontally slidably connected to the inner cavity of the workbench (1), the mold (11) being driven by an electric telescopic rod (6), the inner cavity of the mold (11) being equidistantly provided with at least three mold grooves (12) for accommodating refrigerator back panels of different sizes, racks (18) being fixedly mounted on both sides of the mold (11), and a central portion of the inner cavity of the fixed frame (15) on the workbench (1) being rotatably connected to a gear meshing with the rack (18). A third gear (110) is provided, and a punch (115) corresponding to the size specifications of the three die grooves (12) is floating at the bottom end of the third gear (110). A measuring component for measuring the size of the back plate of the refrigerator is provided on the conveyor belt (21) on one side of the workbench (1). The measuring component includes two centering plates (24) symmetrically elastically slidably connected to the conveyor belt (21). A distance sensor (259) electrically connected to the electric telescopic rod (6) is fixedly installed on the side of the two centering plates (24) that are away from each other.

2. The sheet metal table for punching the back panel of a quick-change refrigerator according to claim 1, characterized in that: A limiting member for limiting the position of the centering plate (24) is arranged on the bracket (2) of the conveyor belt (21), and the limiting member comprises an outer sleeve (251) fixedly connected to the bracket (2), the inner cavity of the outer sleeve (251) is elastically slidably connected to an inner sleeve (252) fixedly connected to the centering plate (24), the outer wall of the inner sleeve (252) is elastically slidably connected to at least one arc-shaped limiting block (254) abutting against the inner wall of the outer sleeve (251), and the inner wall of the outer sleeve (251) is equidistantly provided with at least three limiting grooves (255) matching the arc-shaped limiting blocks (254).

3. The sheet metal table for punching the back panel of a quick-change refrigerator according to claim 2, characterized in that: A lever (2510) is fixedly mounted on the outer wall of the arc-shaped limit block (254); the side of the lever (2510) away from the arc-shaped limit block (254) passes through the inner sleeve (252) and the outer sleeve (251) in sequence and extends to the front side of the outer sleeve (251).

4. The sheet metal table for punching the back panel of a quick-change refrigerator according to claim 2, characterized in that: Slide blocks (256) are fixedly mounted on both sides of the arc-shaped limit block (254); a sliding groove (257) for the slide block (256) to slide is provided in the inner cavity of the inner sleeve (252); a trigger switch (258) corresponding to the slide block (256) is fixedly mounted on the inner wall of the sliding groove (257); and the trigger switch (258) is electrically connected to the distance sensor (259).

5. The sheet metal table for punching the back panel of a quick-change refrigerator according to claim 1, characterized in that: The inner cavity of each mold groove (12) is symmetrically and slidably connected to two clamping plates (13).

6. The sheet metal table for punching the back panel of a quick-change refrigerator according to claim 5, characterized in that: The inner cavity of the mold (11) is provided with a driving member for causing the two clamping plates (13) to move relative to each other, and the driving member includes a bidirectional screw (31) rotatably connected to the inner cavity of the mold (11), and the two sections of the external threads of the bidirectional screw (31) with opposite thread rotation directions are both threadedly sleeved with screw sleeves (32) fixedly connected to the clamping plates (13).

7. The sheet metal table for punching the back panel of a quick-change refrigerator according to claim 6, characterized in that: A button (14) is fixedly mounted on the bottom end of the inner wall of the workbench (1), and the button (14) is electrically connected to a driving motor (3) that drives the bidirectional screw (31) to rotate.

8. The sheet metal table for punching the back panel of a quick-change refrigerator according to claim 1, characterized in that: A collection box (5) for receiving the rear cover of the refrigerator after punching is arranged on the support leg of the support (2) of the conveyor belt (21).

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