A stepped material ejection anti-deformation device for continuous stamping of hardware

Abstract

The utility model discloses a kind of hardware continuous stamping's stepped material pushing anti-deformation device, the utility model relates to stamping process technical field, including stamping assembly, the stamping assembly includes base, the ejector pin assembly includes ejector pin plate, the outer side of the top of ejector pin plate is fixedly installed with several vice ejector pin seat, the middle part of vice ejector pin seat is fixedly installed with vice guide rod, the outer side of vice guide rod is slidably connected with vice ejector pin sleeve, the outer side of vice ejector pin seat top end is fixedly installed with push spring, the middle part of the top end of ejector pin plate is fixedly installed with main ejector pin seat, the middle part of main ejector pin seat is fixedly installed with main guide rod, the outer side of the top end of main guide rod is slidably connected with main ejector pin sleeve, the outer side of main ejector pin seat top end is fixedly installed with return spring, the outer side of main guide rod bottom end is fixedly installed with push ring;The utility model, simple structure, can realize stepped material pushing, effectively avoid the deformation of workpiece due to stress concentration in material pushing process, with higher practical value.

Description

Technical Field

[0001] This utility model relates to the field of stamping technology, specifically to a stepped top material anti-deformation device for continuous stamping of hardware parts. Background Technology

[0002] Stamping is a machining process that uses a die to apply pressure to a sheet metal, causing it to plastically deform or separate, thereby obtaining parts of the desired shape and size. This process is widely used in industries such as automobiles, home appliances, and electronic equipment to manufacture various thin sheet metal parts. The main characteristics of stamping include high efficiency, high precision, and low cost. An ejector system is a system used during manufacturing to eject workpieces or materials from a die, processing equipment, or other fixed device.

[0003] Based on the above, the inventors have discovered the following problems: the current ejection system for metal stamping is usually a one-time forceful ejection. This method is prone to local stress concentration caused by instantaneous force, which increases the risk of deformation and is inconvenient to use.

[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a stepped top material anti-deformation device for continuous stamping of hardware parts, in order to achieve a more practical purpose. Utility Model Content

[0005] The purpose of this utility model is to provide a stepped top material anti-deformation device for continuous stamping of hardware parts, so as to solve the problems mentioned in the background art.

[0006] A stepped ejector anti-deformation device for continuous stamping of hardware parts includes a stamping assembly. The stamping assembly includes a base with a lifting groove in the middle. An ejector assembly is provided inside the lifting groove. The ejector assembly includes a lifting seat, which is slidably connected to the lifting groove. Several mounting seats are fixedly installed on the top of the lifting seat. An ejector pin assembly is provided on the top of the mounting seats. The ejector pin assembly includes an ejector pin plate. Several secondary ejector pin seats are fixedly installed on the outer side of the top of the ejector pin plate. A secondary guide rod is fixedly installed in the middle of the secondary ejector pin seat. A secondary ejector sleeve is slidably connected to the outer side of the rod. A push spring is fixedly installed on the outer side of the top of the secondary ejector seat. The top of the push spring is fixedly connected to the secondary ejector sleeve. A main ejector seat is fixedly installed in the middle of the top of the ejector plate. A main guide rod is fixedly installed in the middle of the main ejector seat. A main ejector sleeve is slidably connected to the outer side of the top of the main guide rod. A return spring is fixedly installed on the outer side of the top of the main ejector seat. The top of the return spring is fixedly connected to the main ejector sleeve. The spring force of the return spring is less than that of the push spring. A push ring is fixedly installed on the outer side of the bottom end of the main guide rod.

[0007] By adopting the above technical solution, the lifting groove facilitates the limiting and guiding of the vertical movement of the lifting seat, making its vertical movement more stable and accurate. The lifting seat also facilitates the vertical movement of the ejector assembly, enabling the ejection of the workpiece. The mounting base facilitates the fixed installation of the ejector assembly, allowing for the selection of different ejector assemblies for different stamping processes. The secondary guide rod facilitates the positioning and guiding of the secondary ejector sleeve, allowing it to slide vertically along the guide rod. The push spring provides upward force to push the secondary guide rod. The main guide rod facilitates the positioning and guiding of the main ejector sleeve, allowing it to slide vertically along the main guide rod. The inclusion of a return spring facilitates the upward pushing of the main ejector sleeve for resetting. The push ring ensures that when the lifting seat moves the ejector assembly upwards, the tops of both the main and auxiliary ejector sleeves contact the workpiece. The push spring applies elastic force, causing the auxiliary ejector sleeve to exert a pushing force on the workpiece edge and compress the return spring, causing the workpiece edge to detach from the stamping die. The push spring also provides cushioning to prevent workpiece deformation. During the upward movement of the ejector assembly, the lifting seat compresses the return spring. Once compressed to a certain extent, the top of the push ring abuts against the main ejector sleeve, causing the main ejector sleeve to exert a pushing force on the center of the workpiece, ejecting it. The delayed pushing force from the main ejector sleeve and the pushing force from the auxiliary ejector sleeve effectively prevent stress concentration and deformation during workpiece ejection.

[0008] Furthermore, a buffer block is fixedly installed on the top of both the main ejector sleeve and the secondary ejector sleeve, and the buffer block is made of elastic rubber.

[0009] By adopting the above technical solution and setting the buffer block, it is convenient to provide further buffering when the workpiece is ejected, so as to avoid workpiece deformation.

[0010] Furthermore, a hydraulic telescopic rod is fixedly installed at the bottom inner side of the lifting groove, and the output end of the hydraulic telescopic rod is fixedly connected to the lifting seat.

[0011] By adopting the above technical solution and using the hydraulic telescopic rod, it is easy to control the up and down movement of the lifting platform.

[0012] Furthermore, a plurality of stamping seats are fixedly installed on the top of the base, and an installation groove is provided in the middle of the stamping seat. A stamping die is detachably connected inside the installation groove.

[0013] By adopting the above technical solution and setting the stamping base, it is easy to fix and install multiple stamping dies, which facilitates the continuous stamping of hardware parts by external stamping equipment.

[0014] Furthermore, the bottom of the stamping die is provided with several ejection holes, which are located on the outside of the buffer block.

[0015] By adopting the above technical solution, the ejector hole facilitates the main ejector sleeve and the auxiliary ejector sleeve to extend out from the ejector hole, making it convenient to eject the workpiece.

[0016] Furthermore, a positioning head is fixedly installed at the top center of the mounting base, and a positioning groove is opened at the bottom of the ejector plate, with the positioning head disposed inside the positioning groove.

[0017] By adopting the above technical solution and setting the positioning head, it is convenient to quickly position the ejector pin assembly during installation.

[0018] Furthermore, an installation block is fixedly installed on the inner center of the positioning head, and locking springs are fixedly installed on both sides of the installation block, with a locking block fixedly installed at one end of each locking spring.

[0019] By adopting the above technical solution and setting the locking spring, it is easy to provide elastic force to push the locking block out.

[0020] Furthermore, one end of the locking block extends to the outside of the positioning head, and a slope is provided at the top of one end of the locking block.

[0021] By adopting the above technical solution, the inclined surface facilitates the positioning groove to press the locking block into the positioning head during the installation of the ejector pin assembly, making the ejector pin assembly easy to install.

[0022] Furthermore, the positioning groove has locking holes at both ends, the locking holes penetrate the side of the ejector plate, and the locking holes are located on the outside of the locking block.

[0023] By adopting the above technical solution, the design of the lock hole facilitates the insertion of the lock block into the lock hole, thereby securing the ejector pin assembly firmly onto the mounting base.

[0024] Furthermore, a limiting groove is provided on both sides inside the lock hole, and an unlocking top block is provided inside the lock hole. Limiting sliders are fixedly installed on both sides of the unlocking top block, and the limiting sliders are slidably connected to the limiting groove.

[0025] By adopting the above technical solution and setting the unlocking top block, it is convenient to push the unlocking top block inward with the workpiece when replacing the ejector assembly, so that the locking block can be pushed out of the locking hole, thereby realizing convenient disassembly and replacement of the ejector assembly.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows: The lifting groove facilitates the limiting and guiding of the vertical movement of the lifting seat, making its vertical movement more stable and accurate. The lifting seat facilitates the vertical movement of the lifting seat, driving the ejector assembly to move up and down, thus ejecting the workpiece. The mounting base facilitates the fixed installation of the ejector assembly, allowing for the selection of different ejector assemblies for different stamping processes. The secondary guide rod facilitates the positioning and guiding of the secondary ejector sleeve, enabling it to slide vertically along the guide rod. The push spring provides elastic force to push the secondary guide rod upwards. The main guide rod facilitates the positioning and guiding of the main ejector sleeve, allowing it to slide vertically along the main guide rod. The return spring facilitates the upward pushing of the main ejector sleeve. The reset mechanism, through the setting of the push ring, facilitates the upward movement of the ejector assembly by the lifting seat. Both the tops of the main ejector sleeve and the auxiliary ejector sleeve are in contact with the workpiece. The push spring applies elastic force, causing the auxiliary ejector sleeve to exert a pushing force on the edge of the workpiece and compressing the reset spring, causing the edge of the workpiece to detach from the stamping die. The push spring also provides cushioning to prevent workpiece deformation. During the upward movement of the ejector assembly by the lifting seat, the reset spring is compressed. After the reset spring is compressed to a certain extent, the top of the push ring abuts against the main ejector sleeve, causing the main ejector sleeve to exert a pushing force on the middle of the workpiece and eject it. The delayed pushing force exerted by the main ejector sleeve on the workpiece, combined with the pushing force exerted by the auxiliary ejector sleeve, effectively avoids deformation caused by stress concentration during workpiece ejection. This utility model has a simple structure, enables stepped ejection, and effectively prevents workpiece deformation due to stress concentration during ejection, possessing high practical value. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of a stepped top material anti-deformation device for continuous stamping of hardware parts according to the present invention.

[0028] Figure 2 This is an exploded view of the stamping component of this utility model;

[0029] Figure 3 This is a schematic diagram of the installation of the ejector pin assembly of this utility model;

[0030] Figure 4 This is a partial exploded view of the ejector pin assembly of this utility model;

[0031] Figure 5 This is a cross-sectional view of the mounting base of this utility model.

[0032] In the diagram: 1. Stamping assembly; 11. Base; 12. Lifting groove; 13. Hydraulic telescopic rod; 14. Stamping seat; 15. Mounting groove; 16. Stamping die; 17. Ejection hole; 2. Ejection assembly; 21. Lifting seat; 22. Mounting seat; 23. Positioning head; 24. Mounting block; 25. Locking spring; 26. Locking block; 27. Inclined surface; 3. Ejector assembly; 31. Ejector plate; 32. Secondary ejector seat; 33. Secondary guide rod; 34. Push spring; 35. Secondary ejector sleeve; 36. Main ejector seat; 37. Main guide rod; 38. Return spring; 39. Push ring; 310. Main ejector sleeve; 311. Buffer block; 312. Positioning groove; 313. Locking hole; 314. Limiting slide groove; 315. Unlocking block; 316. Limiting slider. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Please see Figures 1-5This utility model provides a technical solution: a stepped ejector anti-deformation device for continuous stamping of hardware parts, including a stamping assembly 1, a base 11, and a lifting groove 12 in the middle of the base 11. The lifting groove 12 facilitates the limiting and guiding of the vertical movement of the lifting seat 21, making the vertical movement of the lifting seat 21 more stable and accurate. An ejector assembly 2 is provided inside the lifting groove 12, which includes a lifting seat 21. The lifting seat 21 is slidably connected to the lifting groove 12. The lifting seat 21 facilitates the vertical movement of the lifting seat 21, which drives the ejector pin assembly 3 to move vertically, thereby ejecting the workpiece. Several mounting seats 22 are fixedly installed on the top of the lifting seat 21. The mounting seats 22 facilitate the... The ejector pin assembly 3 is fixedly installed to facilitate the setting of different ejector pin assemblies 3 according to different stamping processes. The top of the mounting base 22 is provided with the ejector pin assembly 3, which includes an ejector pin plate 31. Several secondary ejector pin seats 32 are fixedly installed on the outer side of the top of the ejector pin plate 31. A secondary guide rod 33 is fixedly installed in the middle of the secondary ejector pin seat 32. A secondary ejector pin sleeve 35 is slidably connected to the outer side of the secondary guide rod 33. The secondary guide rod 33 facilitates the positioning and guidance of the secondary ejector pin sleeve 35, allowing the secondary ejector pin sleeve 35 to slide up and down along the secondary guide rod 33. A push spring 34 is fixedly installed on the outer side of the top of the secondary ejector pin seat 32. The push spring 34 provides elastic force to push the secondary guide rod 33 upward. The top of the push spring 34 is fixedly connected to the secondary ejector pin sleeve 35. A main ejector seat 36 is fixedly installed at the center of the top of the ejector plate 31. A main guide rod 37 is fixedly installed at the center of the main ejector seat 36. The main guide rod 37 facilitates the positioning and guidance of the main ejector sleeve 310, allowing the main ejector sleeve 310 to slide up and down along the main guide rod 37. The main ejector sleeve 310 is slidably connected to the outer side of the top of the main guide rod 37. A return spring 38 is fixedly installed on the outer side of the top of the main ejector seat 36. The return spring 38 facilitates the upward pushing of the main ejector sleeve 310 for reset. The top of the return spring 38 is fixedly connected to the main ejector sleeve 310. The elastic force of the return spring 38 is less than that of the push spring 34. A push ring 39 is fixedly installed on the outer side of the bottom of the main guide rod 37. The push ring 39 facilitates the lifting seat 21 to move... When the moving ejector assembly 3 moves upward, the tops of both the main ejector sleeve 310 and the auxiliary ejector sleeve 35 are in contact with the workpiece. The push spring 34 applies elastic force to make the auxiliary ejector sleeve 35 apply a pushing force to the edge of the workpiece and compress the return spring 38, causing the edge of the workpiece to detach from the stamping die 16. The push spring 34 can also provide cushioning to prevent workpiece deformation. During the upward movement of the ejector assembly 3 driven by the lifting seat 21, the return spring 38 is compressed. After the return spring 38 is compressed to a certain extent, the top of the push ring 39 abuts against the main ejector sleeve 310, causing the main ejector sleeve 310 to apply a pushing force to the middle of the workpiece and eject it. The delay of the pushing force applied by the main ejector sleeve 310 to the workpiece and the pushing force applied by the auxiliary ejector sleeve 35 to the workpiece can effectively prevent deformation caused by stress concentration when ejecting the workpiece.

[0035] Both the main ejector sleeve 310 and the auxiliary ejector sleeve 35 are fixedly equipped with buffer blocks 311. The buffer blocks 311 are made of elastic rubber. The buffer blocks 311 are designed to provide further cushioning when ejecting the workpiece, thus preventing workpiece deformation.

[0036] A hydraulic telescopic rod 13 is fixedly installed on the bottom inner side of the lifting groove 12. The output end of the hydraulic telescopic rod 13 is fixedly connected to the lifting seat 21. The hydraulic telescopic rod 13 facilitates the control of the up and down movement of the lifting seat 21.

[0037] The base 11 has several stamping seats 14 fixedly installed on its top. The stamping seat 14 has an installation groove 15 in the middle. The stamping mold 16 is detachably connected inside the installation groove 15. The stamping seat 14 facilitates the fixed installation of multiple stamping molds 16, which makes it convenient for external stamping equipment to continuously stamp hardware parts.

[0038] The stamping die 16 has several ejection holes 17 at its bottom. The ejection holes 17 are located on the outside of the buffer block 311. The ejection holes 17 facilitate the main ejector sleeve 310 and the auxiliary ejector sleeve 35 to extend out of the ejection holes 17, making it convenient to eject the workpiece.

[0039] The mounting base 22 has a positioning head 23 fixedly installed at the top center, and the bottom of the ejector plate 31 has a positioning groove 312. The positioning head 23 is set inside the positioning groove 312. The positioning head 23 facilitates quick positioning when installing the ejector assembly 3.

[0040] The positioning head 23 has an installation block 24 fixedly installed in the middle of its inner side. Locking springs 25 are fixedly installed on both sides of the installation block 24. A locking block 26 is fixedly installed at one end of the locking spring 25. The locking spring 25 provides elastic force to push the locking block 26 out.

[0041] One end of the locking block 26 extends to the outside of the positioning head 23, and a slope 27 is provided on the top of one end of the locking block 26. The slope 27 facilitates the positioning groove 312 to press the locking block 26 into the positioning head 23 when the ejector assembly 3 is installed, so that the ejector assembly 3 can be installed conveniently.

[0042] The positioning groove 312 has locking holes 313 at both ends. The locking holes 313 penetrate the side of the ejector plate 31 and are located on the outside of the locking block 26. The locking holes 313 facilitate the insertion of the locking block 26 into the locking holes 313 to securely fix the ejector assembly 3 on the mounting base 22.

[0043] The lock hole 313 has limit grooves 314 on both sides inside, and an unlocking top block 315 is provided inside the lock hole 313. Limit sliders 316 are fixedly installed on both sides of the unlocking top block 315. The limit sliders 316 are slidably connected to the limit grooves 314. The unlocking top block 315 makes it easy to push the unlocking top block 315 inward when replacing the ejector assembly 3, so that the locking block 26 can be pushed out of the lock hole 313, thereby realizing convenient disassembly and replacement of the ejector assembly 3.

[0044] Specifically, the working principle of this stepped ejector anti-deformation device for continuous stamping of hardware parts is as follows: During use, the stamping base 14 facilitates the fixed installation of multiple stamping dies 16, enabling continuous stamping of hardware parts by external stamping equipment. The ejection hole 17 allows the main ejector sleeve 310 and the auxiliary ejector sleeve 35 to extend out, facilitating the ejection of the workpiece. The lifting groove 12 limits and guides the vertical movement of the lifting base 21, making its vertical movement more stable and accurate. The lifting base 21 also drives the ejector assembly 3 to move up and down, achieving the ejection of the workpiece. The hydraulic telescopic rod 13 facilitates the control of the vertical movement of the lifting base 21. The mounting base 22 facilitates the fixed installation of the ejector pin assembly 3, allowing for the selection of different ejector pin assemblies 3 according to different stamping processes. The positioning head 23 facilitates quick positioning during the installation of the ejector pin assembly 3. The locking spring 25 provides elastic force to push out the locking block 26. The inclined surface 27 allows the positioning groove 312 to press the locking block 26 into the positioning head 23 during the installation of the ejector pin assembly 3, facilitating easy installation. The locking hole 313 allows the locking block 26 to be inserted into the locking hole 313 to securely fix the ejector pin assembly 3 to the mounting base 22. The secondary guide rod 33 facilitates the positioning and guidance of the secondary ejector pin sleeve 35, allowing the secondary ejector pin sleeve 35 to move along the secondary guide rod. The guide rod 33 slides up and down. The push spring 34 provides elastic force to push the auxiliary guide rod 33 upwards. The main guide rod 37 facilitates the positioning and guidance of the main ejector sleeve 310, allowing it to slide up and down along the main guide rod 37. The return spring 38 facilitates the upward push of the main ejector sleeve 310 for reset. The push ring 39 ensures that when the lifting seat 21 moves the ejector assembly 3 upwards, the tops of both the main ejector sleeve 310 and the auxiliary ejector sleeve 35 contact the workpiece. The push spring 34 applies elastic force, causing the auxiliary ejector sleeve 35 to push against the edge of the workpiece and compress the return spring 38, causing the workpiece edge to detach from the stamping die 16. The push spring 34 also provides cushioning to prevent workpiece deformation. The lifting seat 21... During the upward movement of the ejector assembly 3, the return spring 38 is compressed. After the return spring 38 is compressed to a certain extent, the top of the push ring 39 abuts against the main ejector sleeve 310, causing the main ejector sleeve 310 to apply a pushing force to the middle of the workpiece and push it out. The delay of the pushing force applied by the main ejector sleeve 310 to the workpiece and the pushing force applied by the auxiliary ejector sleeve 35 to the workpiece can effectively avoid deformation caused by stress concentration when pushing the workpiece out. The buffer block 311 is set to provide further buffering when pushing the workpiece out, so as to avoid workpiece deformation. The unlocking block 315 is set to make it easy to push the unlocking block 315 inward when replacing the ejector assembly 3, so as to push the locking block 26 out of the locking hole 313, thereby realizing convenient disassembly and replacement of the ejector assembly 3.

[0045] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A stepped ejector anti-deformation device for continuous stamping of hardware parts, characterized in that, The system includes a stamping assembly (1), which includes a base (11). A lifting groove (12) is provided in the middle of the base (11). An ejection assembly (2) is provided inside the lifting groove (12). The ejection assembly (2) includes a lifting seat (21). The lifting seat (21) is slidably connected to the lifting groove (12). Several mounting seats (22) are fixedly installed on the top of the lifting seat (21). An ejector assembly (3) is provided on the top of the mounting seat (22). The ejector assembly (3) includes an ejector plate (31). Several auxiliary ejector seats (32) are fixedly installed on the outer side of the top of the ejector plate (31). An auxiliary guide rod (33) is fixedly installed in the middle of the auxiliary ejector seat (32). A sliding connection is provided on the outer side of the auxiliary guide rod (33). A secondary ejector sleeve (35) is provided. A push spring (34) is fixedly installed on the outer side of the top of the secondary ejector seat (32). The top of the push spring (34) is fixedly connected to the secondary ejector sleeve (35). A main ejector seat (36) is fixedly installed in the middle of the top of the ejector plate (31). A main guide rod (37) is fixedly installed in the middle of the main ejector seat (36). A main ejector sleeve (310) is slidably connected to the outer side of the top of the main guide rod (37). A return spring (38) is fixedly installed on the outer side of the top of the main ejector seat (36). The top of the return spring (38) is fixedly connected to the main ejector sleeve (310). The elastic force of the return spring (38) is less than that of the push spring (34). A push ring (39) is fixedly installed on the outer side of the bottom end of the main guide rod (37).

2. The stepped ejector anti-deformation device for continuous stamping of hardware parts according to claim 1, characterized in that, Both the main ejector sleeve (310) and the secondary ejector sleeve (35) are fixedly equipped with buffer blocks (311), which are made of elastic rubber.

3. The stepped ejector anti-deformation device for continuous stamping of hardware parts according to claim 1, characterized in that, A hydraulic telescopic rod (13) is fixedly installed on the bottom inner side of the lifting groove (12), and the output end of the hydraulic telescopic rod (13) is fixedly connected to the lifting seat (21).

4. The stepped ejector anti-deformation device for continuous stamping of hardware parts according to claim 3, characterized in that, The base (11) has several stamping seats (14) fixedly installed on its top. The stamping seats (14) have an installation groove (15) in the middle. The stamping mold (16) is detachably connected inside the installation groove (15).

5. The stepped ejector anti-deformation device for continuous stamping of hardware parts according to claim 4, characterized in that, The bottom of the stamping die (16) is provided with several ejection holes (17), which are located on the outside of the buffer block (311).

6. The stepped ejector anti-deformation device for continuous stamping of hardware parts according to claim 1, characterized in that, The mounting base (22) has a positioning head (23) fixedly installed at the top center, and the bottom of the ejector plate (31) has a positioning groove (312), with the positioning head (23) located inside the positioning groove (312).

7. The stepped ejector anti-deformation device for continuous stamping of hardware parts according to claim 6, characterized in that, An installation block (24) is fixedly installed in the middle of the inner side of the positioning head (23). Locking springs (25) are fixedly installed on both sides of the installation block (24). A locking block (26) is fixedly installed at one end of the locking spring (25).

8. The stepped ejector anti-deformation device for continuous stamping of hardware parts according to claim 7, characterized in that, One end of the locking block (26) extends to the outside of the positioning head (23), and a slope (27) is provided on the top of one end of the locking block (26).

9. A stepped ejector anti-deformation device for continuous stamping of hardware parts according to claim 6, characterized in that, The positioning groove (312) has locking holes (313) at both ends. The locking holes (313) penetrate the side of the ejector plate (31) and are located on the outside of the lock block (26).

10. A stepped ejector anti-deformation device for continuous stamping of hardware parts according to claim 9, characterized in that, The lock hole (313) has a limiting groove (314) on both sides inside. The lock hole (313) has an unlocking top block (315) inside. The unlocking top block (315) has a limiting slider (316) fixedly installed on both sides. The limiting slider (316) is slidably connected to the limiting groove (314).

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