Foam rubber sheet stamping equipment

Abstract

The utility model relates to the technical field of foam rubber sheet production, in particular to foam rubber sheet stamping equipment which comprises a machine body, a machining table and a lifting module located above the machining table are arranged on the machine body, and a stamping platform used for placing a foam rubber sheet is arranged on the machining table; a punching base is arranged at the end, close to the punching platform, of the lifting module, a cutter module used for cutting a foam rubber sheet is arranged on the face, facing the punching platform, of the punching base, a cutter groove used for allowing the cutter module to be inserted therein is formed in the punching platform, and a pressing assembly is further arranged on the punching base; the abutting assembly is located in the cutter module, and the abutting assembly is used for elastically abutting the foam rubber sheet and preventing the foam rubber sheet from being clamped into the cutter module. The stamping device has the effect of improving the stamping machining efficiency of the foam rubber sheet.

Description

Technical Field

[0001] The present application relates to the technical field of foam film production, and in particular to a foam film stamping device. Background Art

[0002] VHB foam film is made of foamed cotton as the base material and coated with strong acrylic adhesive on one or both sides and supplemented with release paper. It has the functions of sealing and shock absorption, and has good sealing, compression deformation resistance, flame retardancy and wettability. VHB foam film is widely used in electronics, automobiles, home furnishings and other fields.

[0003] In the production process of VHB foam sheets, stamping equipment is usually used to cut VHB foam sheets into specific shapes to meet the use requirements of VHB foam sheets in different products and components. When using existing stamping equipment to stamp VHB foam sheets, the die cutter on the stamping equipment will cut the foam sheets of a specific shape as a whole, but the cut foam sheets of a specific shape are easily stuck inside the die cutter, resulting in the inability to perform the next stamping. The foam sheets stuck inside the die cutter need to be manually removed before continuing, which reduces the stamping efficiency of the foam sheets. Utility Model Content

[0004] In order to improve the stamping processing efficiency of foam films, the present application provides a foam film stamping device.

[0005] The present application provides a foam film stamping device, which adopts the following technical solution:

[0006] A foam film stamping device comprises a body, wherein a processing table and a lifting module located above the processing table are arranged on the body, a stamping platform for placing foam films is arranged on the processing table, a stamping seat is arranged at one end of the lifting module close to the stamping platform, a cutting module for cutting foam films is arranged on the side of the stamping seat facing the stamping platform, a cutting groove for inserting the cutting module is arranged on the stamping platform, a pressing component is also arranged on the stamping seat, the pressing component is located inside the cutting module, and the pressing component is used to elastically press the foam films and prevent the foam films from being stuck in the cutting module.

[0007] By adopting the above technical solution, the use of the cutting knife module in conjunction with the cutting knife groove helps to cut the foam film into a specific shape during the stamping process. During the stamping process, the use of the pressing component helps to elastically press the foam film, thereby helping to improve the stability of the position of the foam film, and further helping to improve the cutting accuracy of the foam film; when the stamping is completed, the pressing effect of the pressing component on the foam film helps to prevent the foam film from being stuck in the cutting knife module, thereby helping to improve the convenience of taking and unloading the cut foam film, and further helping to improve the stamping processing efficiency of the foam film.

[0008] In a specific possible implementation scheme, the pressure assembly includes a fixed plate, a telescopic rod, a pressure spring and a pressure plate, the fixed plate is arranged on the side of the stamping seat facing the stamping platform, the telescopic rod is arranged on the side of the fixed plate away from the stamping seat, the pressure plate is arranged at one end of the telescopic rod away from the fixed plate, the pressure spring is sleeved on the telescopic rod, and one end of the pressure spring is in contact with the pressure plate, and the other end is in contact with the fixed plate.

[0009] By adopting the above technical scheme, during the stamping process, the pressure plate is used to contact the surface of the foam film, and at the same time, the elastic force of the pressure spring makes the pressure plate press against the foam film, which helps to improve the stability of the position of the foam film, and then helps to improve the cutting accuracy of the foam film; after the stamping is completed, when the cutting die assembly rises, the extension of the pressure spring itself helps the pressure plate to continue to press against the foam film, which helps to prevent the foam film from being stuck in the cutting die assembly and rise synchronously with the cutting die assembly, and then helps to improve the convenience of taking and unloading the cut foam film, thereby improving the stamping processing efficiency of the foam film.

[0010] In a specific possible implementation scheme, the cutting knife module includes a knife seat and at least two blades, the knife seat is arranged on a surface of the stamping seat facing the stamping platform, at least two blades are arranged on a surface of the knife seat facing away from the stamping seat and together form a set shape, and there is a gap between two adjacent blades.

[0011] By adopting the above technical solution, the setting of the clearance gap helps to keep the foam film as a whole after punching and cutting, thereby helping to further improve the convenience of taking and cutting the cut foam film, and further improve the stamping processing efficiency of the foam film.

[0012] In a specific possible implementation scheme, a guide column is arranged on the side of the stamping seat facing the processing table, a guide hole for inserting the guide column is arranged on the processing table, and a conical inclined surface for guiding the insertion of the guide column is arranged at one end of the guide hole close to the processing table.

[0013] By adopting the above technical solution, inserting the guide post into the guide hole helps to guide and locate the stamping position of the cutting die set, thereby helping to further improve the cutting accuracy of the foam film. The setting of the conical slope helps to guide the guide post to be inserted into the guide hole.

[0014] In a specific possible implementation manner, a fixed sleeve is provided in the processing table, a positioning rod is inserted in the fixed sleeve, and an end of the positioning rod away from the fixed sleeve passes through the processing table and the stamping platform.

[0015] By adopting the above technical solution, the positioning rod is used to help position the foam film on the stamping platform, thereby helping to improve the accuracy of the placement of the foam film, and further helping to further improve the cutting accuracy of the foam film.

[0016] In a specific feasible implementation scheme, a section of the positioning rod located in the processing table is fixedly sleeved with a connecting plate, and a supporting spring is also sleeved on the positioning rod, and one end of the supporting spring is abutted against the connecting plate, and the other end is abutted against the fixed sleeve, a section of the positioning rod located above the stamping platform is fixedly sleeved with a ejection plate, and a placement groove for placing the ejection plate is provided on the stamping platform, a locking assembly and an unlocking assembly are provided in the processing table, the locking assembly is used to lock the position of the positioning rod so that the ejection plate is located in the placement groove, and the unlocking assembly is used to release the locking of the positioning rod by the locking assembly with the cooperation of the guide column.

[0017] By adopting the above technical solution, the locking assembly helps to lock the position of the positioning rod, thereby helping to lock the ejector plate in the placement groove, thereby helping to ensure that the foam film is in contact with the surface of the stamping platform, and helping to ensure the cutting effect of the cutting knife module on the foam film. The unlocking assembly helps to unlock the locking of the positioning rod, thereby helping to drive the positioning rod and the ejector plate to move upward under the action of the supporting spring, thereby helping to lift the cut foam film, further improving the convenience of taking and unloading the cut foam film, and improving the stamping processing efficiency of the foam film.

[0018] In a specific possible implementation scheme, the locking assembly includes a clamping block and a clamping seat, the clamping block is arranged on the connecting plate, and the clamping seat is arranged on the inner wall of the processing table and is used for being clamped by the clamping block.

[0019] By adopting the above technical solution, the clamping fixation of the clamping block and the clamping seat helps to lock the position of the positioning rod, thereby helping to lock the top plate in the placement groove, and further helping to ensure the surface fit of the foam film and the stamping platform, helping to ensure the cutting effect of the cutting knife module on the foam film.

[0020] In a specific feasible implementation scheme, the unlocking assembly includes an elastic support rod, a mounting box, a telescopic spring and an unlocking block, the guide hole is connected to the interior of the processing table, the elastic support rod is vertically arranged in the processing table and is located below the guide hole, the mounting box is fixedly arranged on the top of the elastic support rod and the mounting box is located between the clamping seat and the inner wall of the processing table, one end of the telescopic spring is connected to the inner wall of the mounting box, the unlocking block is connected to the other end of the telescopic spring, and the unlocking block slider is arranged in the mounting box.

[0021] By adopting the above technical scheme, when the guide column is inserted into the guide hole, the guide column is used to help press the installation box, thereby helping to drive the installation box to move downward, so that the unlocking block in the installation box is inserted into the inside of the card seat under the elastic force of the telescopic spring, and then the card block is squeezed out of the card seat, releasing the lock on the position of the positioning rod, so that the positioning rod and the lifting plate move upward under the action of the supporting spring, which helps to lift the cut foam film, further improving the convenience of taking and unloading the cut foam film, and improving the stamping processing efficiency of the foam film.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. The present application provides a pressing component, which helps to elastically press the foam film during the stamping and cutting process, thereby helping to improve the stability of the foam film position, and further helping to improve the cutting accuracy of the foam film; the pressing component also helps to prevent the foam film from being stuck in the cutting knife module after the stamping and cutting is completed, thereby helping to improve the convenience of taking and unloading the cut foam film, and further helping to improve the stamping processing efficiency of the foam film.

[0024] 2. In the present application, the locking assembly helps to lock the position of the positioning rod, thereby helping to lock the lifting plate in the placement groove, and further helping to ensure that the foam film fits the surface of the stamping platform and helps to ensure the cutting effect of the cutting knife module on the foam film; the unlocking assembly helps to unlock the positioning rod in the locked state, thereby helping to drive the positioning rod and the lifting plate to move upward under the action of the lifting spring, and further helping to lift the cut foam film, further improving the convenience of taking and unloading the cut foam film, and improving the stamping processing efficiency of the foam film. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0026] Figure 2 It is a partial structural cross-sectional view reflecting the specific structure on the bottom surface of the stamping seat.

[0027] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0028] Figure 4 It is a cross-sectional view showing the specific internal structure of the processing table.

[0029] Figure 5 yes Figure 4 Enlarged view of point B in the middle.

[0030] Explanation of the reference numerals in the accompanying drawings: 1. body; 2. processing table; 3. lifting module; 4. stamping platform; 5. stamping seat; 6. cutting knife module; 61. knife seat; 62. blade; 7. cutting knife groove; 8. pressing assembly; 81. fixing plate; 82. telescopic rod; 83. pressing spring; 84. pressing plate; 9. clearance; 10. guide column; 11. guide hole; 12. conical slope; 13. fixing sleeve; 14. positioning rod; 15. connecting plate; 16. supporting spring; 17. ejecting plate; 18. placement slot; 19. locking assembly; 191. snap-in block; 192. snap-in seat; 20. unlocking assembly; 201. elastic support rod; 202. mounting box; 203. telescopic spring; 204. unlocking block; 21. card interface. DETAILED DESCRIPTION

[0031] The present application is further described in detail below in conjunction with the accompanying drawings.

[0032] The present application embodiment discloses a foam film stamping device, referring to Figure 1 and Figure 2, including a body 1, a processing table 2 is fixedly mounted on the body 1, and a stamping platform 4 is fixedly mounted on the processing table 2. A lifting module 3 is also mounted on the body 1 above the stamping platform 4, a stamping seat 5 is mounted at the bottom end of the lifting module 3, and a plurality of cutting knife modules 6 are arranged on the side of the stamping seat 5 facing the stamping platform 4, and a plurality of cutting knife grooves 7 are opened on the stamping platform 4 at positions corresponding to the plurality of cutting knife modules 6.

[0033] Reference Figure 2 and Figure 3 Each group of cutting knife modules 6 includes a knife seat 61 and at least two blades 62. In this embodiment, each group of cutting knife modules 6 has two blades 62. The knife seat 61 is fixedly mounted on the bottom surface of the punching seat 5. The two blades 62 are fixedly mounted on the bottom surface of the knife seat 61 and together form a set shape. There is a clearance gap 9 between the two blades 62.

[0034] Reference Figure 2 and Figure 3 , a plurality of groups of pressing assemblies 8 are arranged on the bottom surface of the punching seat 5, and each group of pressing assemblies 8 is located at the inner circle of the knife seat 61 and the two blades 62. Each group of pressing assemblies 8 includes a fixed plate 81, a telescopic rod 82, a pressing spring 83 and a pressing plate 84. The fixed plate 81 is fixedly mounted on the bottom surface of the punching seat 5, and the telescopic rod 82 is vertically fixedly mounted on the bottom surface of the fixed plate 81. The pressing plate 84 is fixedly connected to one end of the telescopic rod 82 away from the fixed plate 81, and the bottom surface of the pressing plate 84 is lower than the bottom surface of the blade 62. The pressing spring 83 is sleeved on the telescopic rod 82, and the bottom end of the mortgage spring abuts against the pressing plate 84, and the top end abuts against the fixed plate 81.

[0035] Reference Figure 4 and Figure 5 The processing table 2 is hollow inside, and a fixed sleeve 13 is fixedly installed on the bottom wall inside the processing table 2. A positioning rod 14 is inserted and lifted on the fixed sleeve 13. The end of the positioning rod 14 away from the fixed sleeve 13 passes through the processing table 2 and the stamping platform 4 upward. A connecting plate 15 is fixedly installed on a section of the positioning rod 14 located inside the processing table 2. A supporting spring 16 is also sleeved on a section of the positioning rod 14 located inside the processing table 2, and the top end of the supporting spring 16 abuts against the connecting plate 15, and the bottom end abuts against the fixed sleeve 13. A top plate 17 is fixedly installed on a section of the positioning rod 14 located above the stamping platform 4, and a placement groove 18 is provided on the top surface of the stamping platform 4.

[0036] Reference Figure 1 and Figure 3When punching and cutting the foam film, the operator places the foam film on the punching platform 4 and uses the positioning rod 14 to position the foam film. After the foam film is placed, the lifting module 3 drives the punching seat 5 and the multiple cutting knife modules 6 to punch, so that the multiple blades 62 are correspondingly inserted into the cutting knife grooves 7, thereby punching and cutting the foam film.

[0037] Reference Figure 2 and Figure 3 During the stamping process of the stamping seat 5, before the blade 62 cuts the foam film, the pressing plate 84 first contacts the surface of the foam film, and presses the foam film tightly under the elastic force of the pressing spring 83, which helps to improve the stability of the position of the foam film, and further helps to improve the stamping and cutting accuracy of the foam film.

[0038] Reference Figure 2 and Figure 3 During the punching and cutting process, the clearance gap 9 between the two blades 62 helps to keep the foam film as a whole after punching and cutting, thereby helping to improve the convenience of taking and unloading the cut foam film and improving the punching processing efficiency of the foam film.

[0039] Reference Figure 1 and Figure 3 After the punching and cutting is completed, the punching seat 5 gradually moves up and resets, thereby driving the cutting die set 6 to move up. At the same time, the pressing plate 84 helps to temporarily maintain the pressing effect on the foam film under the extension of the pressing spring 83, thereby helping to prevent the foam film from being stuck in the cutting die set 6 and rising synchronously with the cutting die set 6, thereby helping to further improve the convenience of taking and unloading the cut foam film, and further improving the stamping processing efficiency of the foam film.

[0040] Reference Figure 1 and Figure 4 A guide column 10 is fixedly mounted on the bottom surface of the punching seat 5, a guide hole 11 is opened on the top surface of the processing table 2, and the length of the guide column 10 is greater than the hole depth of the guide hole 11, and a conical inclined surface 12 is set at the top opening of the guide hole 11. During the punching process of the punching seat 5, the guide column 10 moves downward synchronously under the drive of the punching seat 5, and is inserted into the guide hole 11 under the guidance of the conical inclined surface 12, which helps to guide and locate the punching position of the cutting die set 6, thereby helping to further improve the punching and cutting accuracy of the foam film.

[0041] Reference Figure 4 and Figure 5The processing table 2 is provided with a locking assembly 19, which includes a clamping block 191 and a clamping seat 192. The clamping block 191 is fixedly connected to the connecting plate 15, and the clamping seat 192 is fixedly installed on the inner wall of the processing table 2. The clamping seat 192 is provided with a clamping interface 21. The operator presses the positioning rod 14, thereby driving the connecting plate 15 and the clamping block 191 to move downward synchronously, so that the clamping block 191 is fixedly clamped into the clamping interface 21, which helps to lock the position of the positioning rod 14, helps to lock the ejector plate 17 in the placement groove 18, and further helps to ensure that the foam film is attached to the surface of the stamping platform 4, and ensures the cutting effect of the cutting die 6 on the foam film.

[0042] Reference Figure 4 and Figure 5 The processing table 2 is also provided with an unlocking assembly 20, which includes an elastic support rod 201, a mounting box 202, a telescopic spring 203 and an unlocking block 204. The guide hole 11 is connected to the inside of the processing table 2. The elastic support rod 201 is vertically fixedly mounted on the inner bottom wall of the processing table 2. The mounting box 202 is fixedly mounted on the top of the elastic support rod 201. The mounting box is located below the guide hole 11, and the opposite side walls of the mounting box are respectively slidably abutted against the clamping seat 192 and the inner wall of the processing table 2, and the opening of the mounting box is arranged toward the clamping seat 192. One end of the telescopic spring 203 is fixedly connected to the inner wall of the mounting box 202, and the unlocking block 204 is fixedly connected to the other end of the telescopic spring 203, and the slider of the unlocking block 204 is installed in the mounting box 202.

[0043] Reference Figure 1 and Figure 5 When the guide column 10 is inserted into the guide hole 11, the bottom end of the guide column 10 will press against the installation box 202, thereby driving the installation box 202 to move downward, so that the opening of the installation box 202 is aligned with the card interface 21, and then the unlocking block 204 in the installation box 202 is inserted into the card interface 21 under the elastic force of the telescopic spring 203. The unlocking block 204 entering the card interface 21 will squeeze the card block 191 out of the card interface 21, so that the card block 191 and the card seat 192 are no longer clamped and fixed, and the lock on the position of the positioning rod 14 is released, so that the positioning rod 14 and the ejector plate 17 move upward under the action of the supporting spring 16, which helps to lift the cut foam film through the ejector plate 17, further improving the convenience of taking and unloading the cut foam film, and improving the stamping processing efficiency of the foam film.

[0044] The implementation principle of the embodiment of the present application is: the operator presses the positioning rod 14, thereby driving the connecting plate 15 and the clamping block 191 to move downward synchronously, so that the clamping block 191 is fixedly clamped into the clamping interface 21, thereby helping to lock the position of the positioning rod 14, and then helping to lock the top plate 17 inside the placement groove 18.

[0045] The operator places the foam film on the punching platform 4 and uses the positioning rod 14 to position the foam film. After the foam film is placed, the lifting module 3 drives the punching seat 5 and the multiple cutting modules 6 to punch, so that the multiple blades 62 are correspondingly inserted into the cutting grooves 7, thereby punching and cutting the foam film.

[0046] During the punching and cutting process, the clearance gap 9 between the two blades 62 helps the foam film to remain a whole after punching and cutting, thereby helping to improve the convenience of taking out the cut foam film and improving the punching processing efficiency of the foam film.

[0047] After the punching and cutting is completed, the punching seat 5 gradually moves up and resets, thereby driving the cutting die 6 to move up. At the same time, the pressure plate 84 helps to temporarily maintain the pressure effect on the foam film under the extension of the pressure spring 83, thereby helping to prevent the foam film from being stuck in the cutting die 6 and rising synchronously with the cutting die 6, which further helps to further improve the convenience of taking and unloading the cut foam film, and further improves the stamping processing efficiency of the foam film.

[0048] During the stamping process of the stamping seat 5, the guide column 10 moves downward synchronously under the drive of the stamping seat 5, and is inserted into the guide hole 11 under the guidance of the conical slope 12, which helps to guide and position the stamping position of the cutting module 6, thereby helping to further improve the stamping and cutting accuracy of the foam film.

[0049] When the guide column 10 is inserted into the guide hole 11, the bottom end of the guide column 10 will press against the installation box 202, thereby driving the installation box 202 to move downward, so that the opening of the installation box 202 is aligned with the card interface 21, and then the unlocking block 204 in the installation box 202 is inserted into the card interface 21 under the elastic force of the telescopic spring 203. The unlocking block 204 entering the card interface 21 will squeeze the card block 191 out of the card interface 21, so that the card block 191 and the card seat 192 are no longer clamped and fixed, and the lock on the position of the positioning rod 14 is released, so that the positioning rod 14 and the top plate 17 move upward under the action of the support spring 16, which helps to lift the cut foam film through the top plate 17, further improving the convenience of taking and unloading the cut foam film, and improving the stamping processing efficiency of the foam film.

[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A foam film stamping device, characterized in that: The invention comprises a machine body (1), wherein a processing table (2) and a lifting module (3) located above the processing table (2) are arranged on the machine body (1), a punching platform (4) for placing a foam film is arranged on the processing table (2), a punching seat (5) is arranged at one end of the lifting module (3) close to the punching platform (4), a cutting module (6) for cutting the foam film is arranged on the side of the punching seat (5) facing the punching platform (4), a cutting groove (7) for inserting the cutting module (6) is arranged on the punching platform (4), and a pressing component (8) is also arranged on the punching seat (5), wherein the pressing component (8) is located inside the cutting module (6), and the pressing component (8) is used to elastically press the foam film and prevent the foam film from being stuck in the cutting module (6).

2. The foam film stamping equipment according to claim 1, characterized in that: The pressing assembly (8) comprises a fixed plate (81), a telescopic rod (82), a pressing spring (83) and a pressing plate (84); the fixed plate (81) is arranged on a surface of the stamping seat (5) facing the stamping platform (4); the telescopic rod (82) is arranged on a surface of the fixed plate (81) facing away from the stamping seat (5); the pressing plate (84) is arranged at one end of the telescopic rod (82) away from the fixed plate (81); the pressing spring (83) is sleeved on the telescopic rod (82); one end of the pressing spring (83) is in contact with the pressing plate (84); and the other end is in contact with the fixed plate (81).

3. The foam film stamping equipment according to claim 1, characterized in that: The cutting die set (6) comprises a knife seat (61) and at least two blades (62); the knife seat (61) is arranged on a surface of the punching seat (5) facing the punching platform (4); at least two blades (62) are arranged on a surface of the knife seat (61) facing away from the punching seat (5) and together form a set shape; and there is a clearance gap (9) between two adjacent blades (62).

4. The foam film stamping equipment according to claim 1, characterized in that: A guide column (10) is arranged on the side of the punching seat (5) facing the processing table (2), a guide hole (11) for inserting the guide column (10) is arranged on the processing table (2), and a conical inclined surface (12) for guiding the insertion of the guide column (10) is arranged at one end of the guide hole (11) close to the processing table (2).

5. The foam film stamping equipment according to claim 4, characterized in that: A fixed sleeve (13) is arranged in the processing table (2), a positioning rod (14) is inserted in the fixed sleeve (13), and an end of the positioning rod (14) away from the fixed sleeve (13) passes through the processing table (2) and the stamping platform (4).

6. The foam film stamping equipment according to claim 5, characterized in that: A section of the positioning rod (14) located inside the processing table (2) is fixedly sleeved with a connecting plate (15), and a supporting spring (16) is also sleeved on the positioning rod (14), and one end of the supporting spring (16) is in contact with the connecting plate (15), and the other end is in contact with the fixed sleeve (13). A section of the positioning rod (14) located above the stamping platform (4) is fixedly sleeved with a top material plate (17), and a placement groove (18) for placing the top material plate (17) is provided on the stamping platform (4). A locking component (19) and an unlocking component (20) are provided inside the processing table (2). The locking component (19) is used to lock the position of the positioning rod (14) so ​​that the top material plate (17) is located in the placement groove (18), and the unlocking component (20) is used to release the locking of the positioning rod (14) by the locking component (19) with the cooperation of the guide column (10).

7. The foam film stamping equipment according to claim 6, characterized in that: The locking assembly (19) comprises a clamping block (191) and a clamping seat (192); the clamping block (191) is arranged on the connecting plate (15); the clamping seat (192) is arranged on the inner wall of the processing table (2) and is used for being clamped by the clamping block (191).

8. The foam film stamping equipment according to claim 7, characterized in that: The unlocking assembly (20) comprises an elastic support rod (201), a mounting box (202), a telescopic spring (203) and an unlocking block (204); the guide hole (11) is connected to the interior of the processing table (2); the elastic support rod (201) is vertically arranged in the processing table (2) and is located below the guide hole (11); the mounting box (202) is fixedly arranged at the top of the elastic support rod (201) and the mounting box (202) is located between the clamping seat (192) and the inner wall of the processing table (2); one end of the telescopic spring (203) is connected to the inner wall of the mounting box (202); the unlocking block (204) is connected to the other end of the telescopic spring (203); and a slider of the unlocking block (204) is arranged in the mounting box (202).

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