A welding fixture for an SF6 circuit breaker housing

Abstract

The utility model relates to power supply equipment technical field discloses a kind of welding fixture of SF6 circuit breaker shell, including bed, the top of the bed is provided with driving mechanism, the front side of the bed is provided with dismounting mechanism, the bottom of the bed is fixedly connected with bottom plate, the top of the bottom plate is provided with dust collection mechanism, the top of the bottom plate is fixedly connected with operation table, the top of the operation table is provided with clamping mechanism;The dismounting mechanism includes mounting seat, the mounting seat is arranged in the front side of bed, the inner wall of the mounting seat is slidably connected with docking seat, the inner wall of the mounting seat is slidably connected with clamping plate.In the utility model, sliding docking seat and push lock block slide into lock hole and lock clamping plate, so that tooling is kept stable and does not loosen during welding process after installation, by the cooperation of insert block and spring inserted into insertion hole, so that docking seat can be positioned after moving in place, ensure that tooling installation position is accurate and correct.

Description

Technical Field

[0001] This utility model relates to the field of power supply equipment technology, and in particular to a welding fixture for the housing of an SF6 circuit breaker. Background Technology

[0002] SF6 circuit breakers are high-voltage switchgear that uses sulfur hexafluoride gas as the arc-extinguishing and insulating medium. Due to their excellent insulation performance and arc-extinguishing capability, they play a key role in controlling and protecting circuits. As the core component of the equipment, the welding quality of the SF6 circuit breaker casing directly affects the equipment's sealing performance, mechanical strength, and service life. Therefore, extremely high requirements are placed on the accuracy and stability of the welding process.

[0003] Traditional SF6 circuit breaker housing welding fixtures consist of a fixed base, adjustable clamps, and fastening bolts. During use, operators need to place the housing on the fixed base, adjust the position of the clamps, and tighten the bolts to position and clamp the housing before welding. However, due to the significant differences in size and shape of SF6 circuit breaker housings of different models, the adjustment range of the fixed base and clamps is limited, making it difficult to meet diverse welding needs. This results in some housings not being accurately positioned during welding, affecting the welding quality.

[0004] To address the aforementioned issues, existing technologies employ welding fixtures with sliding docking seats and replaceable clamps to accommodate housings of different specifications. However, during actual use, operators must use bolts to secure the fixture. Since the docking seat and fixture body are bolted together, disassembly requires the use of tools to unscrew each bolt individually, which is not only cumbersome but also leads to thread wear due to repeated disassembly and assembly, affecting connection stability. Furthermore, the replaceable clamps lack a quick positioning and unlocking mechanism during disassembly, necessitating repeated adjustments when changing clamps in different positions, significantly increasing fixture changeover time and reducing production efficiency. Therefore, a welding fixture for SF6 circuit breaker housings is proposed to solve these problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a welding fixture for SF6 circuit breaker housings, aiming to improve the problem in the prior art where repeated adjustments are required when changing clamps in different positions, which greatly increases tooling change time and reduces production efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a welding fixture for an SF6 circuit breaker housing, comprising a base, a driving mechanism provided on the top of the base, a disassembly mechanism provided on the front side of the base, a base plate fixedly connected to the bottom of the base, a dust collection mechanism provided on the top of the base plate, an operating table fixedly connected to the top of the base plate, and a clamping mechanism provided on the top of the operating table.

[0007] The disassembly mechanism includes a mounting base, which is located on the front side of the base. A docking seat is slidably connected to the inner wall of the mounting base, and a retaining plate is slidably connected to the inner wall of the mounting base. Multiple force-applying rings are fixedly connected to the outer wall of the docking seat. A locking component is provided on the right side of the mounting base, a positioning component is provided on the top of the docking seat, and a release component is provided inside the mounting base.

[0008] As a further description of the above technical solution:

[0009] The clamping mechanism includes two pressure plates, the bottoms of which are slidably connected to the top of the operating table. A rotating plate is fixedly connected to the bottom of the docking seat. Two clamping plates are slidably connected to the inner walls of the rotating plate. Fastening components are provided on the front sides of the two pressure plates.

[0010] As a further description of the above technical solution:

[0011] The drive mechanism includes an air pump, the bottom of which is fixedly connected to the top of the base. A telescopic rod is fixedly connected to the top of the inner wall of the base, and the bottom end of the telescopic rod is fixedly connected to the top of the mounting base.

[0012] As a further description of the above technical solution:

[0013] The ash collection mechanism includes two splash guards, the bottoms of which are fixedly connected to the top of the operating table. The top of the operating table has an ash discharge port, and a collection box is slidably connected to the top of the base plate.

[0014] As a further description of the above technical solution:

[0015] The locking assembly includes a locking block, the left side of which is slidably connected to the right side of the outer wall of the mounting base, and a locking hole is provided on the top of the locking plate.

[0016] As a further description of the above technical solution:

[0017] The positioning component includes a plug, the outer wall of which is slidably connected to the inner wall of the mounting base, a spring is fixedly connected to the top of the plug, and multiple insertion holes are provided on the top of the docking base.

[0018] As a further description of the above technical solution:

[0019] The positioning assembly includes a rotating shaft, which is fixedly connected to the inner wall of the mounting base. A lever is rotatably connected to the outer wall of the rotating shaft, and the rear side of the lever is rotatably connected to the front side of the spring.

[0020] As a further description of the above technical solution:

[0021] The fastening assembly includes a plate base, the outer wall of which is fixedly connected to the front side of the right pressure plate, a pull plate rotatably connected to the front side of the plate base, a pull ring rotatably connected to the inner wall of the pull plate, and a pull hook fixedly connected to the front side of the left pressure plate.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, the sliding docking seat and the locking block slide into the locking hole to lock the plate, so that the tooling remains stable and does not loosen during the welding process after installation. The insertion block and spring cooperate to insert into the insertion hole, so that the docking seat can be positioned after moving into place, ensuring that the tooling installation position is accurate. At the same time, the spring is compressed by pressing down the lever to drive the insertion block to be pulled out to release the positioning, so that the docking seat can be rotated freely to replace the clamping plate in different positions, making the tooling disassembly process convenient and efficient, and greatly shortening the replacement time.

[0024] 2. In this utility model, the linkage design of the fastening assembly, including the plate base, pull plate, pull ring, and pull hook, enables the two pressure plates to quickly clamp the clamping plate when the pull ring is pulled. The pull ring and pull hook form a locking structure. The clamping plate is slidably connected to the inner wall of the rotating plate, allowing the clamping plate to adapt to the housing contour for lateral clamping when the pressure plate clamps the clamping plate. By removing the pull ring from the pull hook and pushing the pull plate in the opposite direction, the pressure plate can be quickly separated, and the clamping plate can be reset along the inner wall of the rotating plate, realizing the rapid release and removal of the housing. This improves the clamping stability and work efficiency during circuit breaker housing welding. Attached Figure Description

[0025] Figure 1 A perspective view of a welding fixture for an SF6 circuit breaker housing proposed in this utility model;

[0026] Figure 2 This is a front view of a welding fixture for an SF6 circuit breaker housing proposed in this utility model;

[0027] Figure 3 This is a partial structural exploded view of a welding fixture for an SF6 circuit breaker housing proposed in this utility model;

[0028] Figure 4 This is a partial structural cross-sectional view of a welding fixture for an SF6 circuit breaker housing proposed in this utility model;

[0029] Figure 5 This is an exploded view of the clamping mechanism of a welding fixture for an SF6 circuit breaker housing proposed in this utility model.

[0030] Figure 6 for Figure 5 Enlarged view of point A.

[0031] Legend:

[0032] 1. Base; 2. Drive mechanism; 201. Air pump; 202. Telescopic rod; 3. Base plate; 4. Disassembly mechanism; 401. Mounting seat; 402. Docking seat; 403. Clamping plate; 404. Force ring; 405. Locking assembly; 4051. Locking block; 4052. Locking hole; 406. Positioning assembly; 4061. Inserting block; 4062. Spring; 4063. Insertion hole; 407. Release assembly; 4071. Rotating shaft; 4072. Lever; 5. Operating table; 6. Clamping mechanism; 601. Pressure plate; 602. Rotating plate; 603. Clamping plate; 604. Fastening assembly; 6041. Plate base; 6042. Pull plate; 6043. Pull ring; 6044. Pull hook; 7. Ash collection mechanism; 701. Splash guard; 702. Ash outlet; 703. Collection box. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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] See attached document Figure 1 Appendix Figure 3 and attached Figure 4 This utility model provides an embodiment of a welding fixture for an SF6 circuit breaker housing, comprising a base 1, which provides the mounting foundation and support for the entire fixture. A drive mechanism 2 is provided on the top of the base 1, which provides power for the operation of the fixture. A disassembly mechanism 4 is provided on the front side of the base 1, which is used for quick tooling replacement. A base plate 3 is fixedly connected to the bottom of the base 1. A dust collection mechanism 7 is provided on the top of the base plate 3, which collects dust and debris generated during the welding process. An operating table 5 is fixedly connected to the top of the base plate 3, which provides an installation platform for a clamping mechanism 6 and serves as a working surface for placing the housing to be welded. The clamping mechanism 6 is provided on the top of the operating table 5, which is used to fix the SF6 circuit breaker housing to be welded, ensuring the stability of the housing position during the welding process.

[0035] The disassembly mechanism 4 includes a mounting base 401, which is located on the front side of the machine base 1. A docking seat 402 is slidably connected to the inner wall of the mounting base 401. The docking seat 402 is used to dock with the welding fixture and slides within the mounting base 401 to achieve the installation and disassembly of the fixture. A retaining plate 403 is slidably connected to the inner wall of the mounting base 401. The retaining plate 403 can be inserted into the retaining groove of the docking seat 402 to achieve initial fixation of the welding fixture. Multiple force-applying rings 404 are fixedly connected to the outer wall of the docking seat 402. The force-applying rings 404 facilitate the operator to apply force and push the docking seat 402 to slide within the mounting base 401. A locking component 405 is provided on the right side. The locking component 405 is used to lock the clamping plate 403 to ensure the tooling is installed securely. The locking component 405 includes a locking block 4051. The left side of the locking block 4051 is slidably connected to the right side of the outer wall of the mounting base 401. The locking block 4051 locks the clamping plate 403 by sliding into the locking hole 4052 of the clamping plate 403. The top of the clamping plate 403 has a locking hole 4052. The locking hole 4052 cooperates with the locking block 4051 to lock and unlock the clamping plate 403. A positioning component 406 is provided on the top of the docking base 402. The positioning component 406 is used to ensure the docking base 402 is secure. To ensure accurate positioning and precision tooling installation, the positioning component 406 includes a plug 4061. The outer wall of the plug 4061 is slidably connected to the inner wall of the mounting base 401. The plug 4061 is positioned by inserting into the insertion hole 4063 of the mating seat 402. A spring 4062 is fixedly connected to the top of the plug 4061, providing elastic support to ensure that the plug 4061 can be inserted into the insertion hole 4063. The top of the mating seat 402 has multiple insertion holes 4063, which cooperate with the plug 4061 to achieve positioning of the mating seat 402. The mounting base 401 has a release mechanism inside. Positioning component 407 and unpositioning component 407 are used to release the positioning state of positioning component 406 so as to replace tooling. Unpositioning component 407 includes a rotating shaft 4071, which is fixedly connected to the inner wall of mounting base 401. The rotating shaft 4071 provides a rotation fulcrum for lever 4072. The lever 4072 is rotatably connected to the outer wall of rotating shaft 4071. Lever 4072 compresses spring 4062 by rotating, which drives the insert 4061 to be pulled out of the insertion hole 4063, thereby releasing the positioning. The rear side of lever 4072 is rotatably connected to the front side of spring 4062 so that spring 4062 can be compressed when lever 4072 rotates.

[0036] Specifically, when the disassembly mechanism 4 is working, the mounting base 401 is first fixed to the front side of the machine base 1 as a basic frame. When changing the tooling, the operator holds the force ring 404 on the outer wall of the docking seat 402 and slides the docking seat 402 along the inner wall of the mounting base 401. At the same time, the clamping plate 403 slides synchronously on the inner wall of the mounting base 401. When the docking seat 402 moves to the appropriate position, the clamping plate 403 inserts into the slot of the docking seat 402, achieving initial fixation of the tooling. Then, the locking block 4051 is pushed so that its left side slides along the right side of the outer wall of the mounting base 401 until it slides into the locking hole 4052 at the top of the clamping plate 403, locking the clamping plate 403 and completing the stable installation of the tooling. During positioning, the inserting block 4061 slides on the inner wall of the mounting base 401, and the top... Spring 4062 provides elastic support. After the docking seat 402 moves into place, it rotates. Spring 4062 pushes the insert block 4061 to insert into the insertion hole 4063 at the top of the docking seat 402 to achieve precise positioning. When it is necessary to replace the clamping plate 603 in different positions, press down the lever 4072 on the rotating shaft 4071. The rear side of the lever 4072 rotates and compresses the spring 4062, causing the insert block 4061 to be pulled out of the insertion hole 4063. After releasing the positioning, rotate the docking seat 402 to select the appropriate clamping plate 603. When disassembling the tooling, first press down the lever 4072, then push the locking block 4051 in the opposite direction to disengage from the locking hole 4052, unlock the clamping plate 403, and finally slide the docking seat 402 through the force ring 404 to remove the tooling and complete the disassembly process.

[0037] See attached document Figure 2 Appendix Figure 5 and attached Figure 6The clamping mechanism 6 includes two pressure plates 601, the bottoms of which are slidably connected to the top of the operating table 5. The pressure plates 601 are used to lock the clamping plates 603. A rotating plate 602 is fixedly connected to the bottom of the docking seat 402. The rotating plate 602 provides an installation base for the clamping plates 603 and rotates with the docking seat 402 to switch the position of the clamping plates 603. Two clamping plates 603 are slidably connected to the inner wall of the rotating plate 602. Each set of clamping plates 603 corresponds to a different model of circuit breaker housing. The clamping plates 603 are used to directly press the SF6 circuit breaker housing to be welded. Fastening components 604 are provided on the front side of the two pressure plates 601. The fastening components 604 are used to lock the position of the two pressure plates 601 to ensure stable clamping of the housing. 4 includes a plate base 6041, the outer wall of which is fixedly connected to the front side of the right pressure plate 601. The plate base 6041 provides a fulcrum for the pull plate 6042 and is the basic connecting component of the fastening assembly 604. The pull plate 6042 is rotatably connected to the front side of the plate base 6041. The pull plate 6042 pulls the left pressure plate 601 by rotation, realizing the relative movement and clamping action of the two pressure plates 601. The inner wall of the pull plate 6042 is rotatably connected to a pull ring 6043. The pull ring 6043 facilitates the operator to pull the pull plate 6042 and can cooperate with the pull hook 6044 to achieve locking. The front side of the left pressure plate 601 is fixedly connected to the pull hook 6044. The pull hook 6044 cooperates with the pull ring 6043 to form a locking structure to prevent the pressure plate 601 from loosening.

[0038] Specifically, when the clamping mechanism 6 is working, firstly, according to the size of the circuit breaker housing, select the appropriate clamping plate 603 by rotating the docking seat 402, place the housing between the two clamping plates 603, push the pressure plate 601 to slide along the top of the operating table 5, adjust the initial distance between the two pressure plates 601, and when operating the fastening assembly 604, pull the pull plate 6042 on the front side plate seat 6041 of the right pressure plate 601, drive the pull ring 6043 to rotate, so that the pull plate 6042 pulls the left pressure plate 601 to the right until the two pressure plates are aligned. When plate 601 clamps clamping plate 603, pull ring 6043 is hooked onto hook 6044 on the front side of left pressure plate 601 to form a locking structure. While pressure plate 601 clamps clamping plate 603, clamping plate 603 is squeezed and slides along the inner wall of rotating plate 602 to clamp the housing from the side. When disassembling, first remove pull ring 6043 from hook 6044, push pull plate 6042 in the opposite direction to separate the two pressure plates 601, and at the same time, clamping plate 603 slides back along the inner wall of rotating plate 602 to release the clamping of the housing.

[0039] See attached document Figure 1 Appendix Figure 2 and attached Figure 5The drive mechanism 2 includes an air pump 201, the bottom of which is fixedly connected to the top of the base 1. The air pump 201 provides a power source and provides compressed gas for the operation of the drive mechanism 2. A telescopic rod 202 is fixedly connected to the top of the inner wall of the base 1. The bottom end of the telescopic rod 202 is fixedly connected to the top of the mounting base 401. The telescopic rod 202 moves in extension and retraction under the action of the air pump 201, thereby driving the mounting base 401 to move in the vertical direction. The dust collection mechanism 7 includes two splash guards 701, the bottom of which is fixedly connected to the top of the operating table 5. The splash guards 701 are used to block the spatter generated during the welding process and prevent it from splashing everywhere. The top of the operating table 5 is provided with a dust outlet 702, which is used to guide the dust and debris generated during welding to fall into the collection box 703. The top of the base plate 3 is slidably connected to the collection box 703, which is used to collect the dust and debris falling from the dust outlet 702 for easy cleaning.

[0040] Specifically, in the drive mechanism 2, the air pump 201 provides compressed gas power, which drives the mounting base 401 to move vertically via the telescopic rod 202, realizing the lifting and adjustment of the disassembly mechanism 4, which facilitates tooling replacement and welding operations. As for the dust collection mechanism 7, the anti-splash plate 701 effectively blocks welding spatter, preventing it from affecting operation and equipment safety. The dust outlet 702 guides dust and debris to fall, and together with the sliding collection box 703, it collects waste in a centralized manner, simplifying the cleaning process and keeping the work area clean.

[0041] Working principle: In the disassembly mechanism 4, the mounting base 401 is fixed to the front side of the machine base 1, forming the basic framework for the entire disassembly operation. When it is necessary to change the welding fixture, the operator holds the force ring 404 on the outer wall of the docking seat 402 and slides the docking seat 402 along the inner wall of the mounting base 401. At this time, the clamping plate 403 slides on the inner wall of the mounting base 401. When the docking seat 402 moves to the appropriate position, the clamping plate 403 inserts into the slot of the docking seat 402, initially fixing the fixture. Then, the operator pushes the locking block 4051, so that its left side slides along the right side of the outer wall of the mounting base 401. When the locking block 4051 slides into the locking hole 4052 at the top of the clamping plate 403, the clamping plate 403 is locked, and the fixture is securely installed to prevent loosening during welding. The insert block 4061 in the positioning component 406 slides on the inner wall of the mounting base 401, and the spring 406 fixed at the top... 2. Provides elastic support. When the docking seat 402 moves into place and rotates, the spring 4062 pushes the insert block 4061 to insert into the insertion hole 4063 on the top of the docking seat 402, achieving precise positioning and ensuring that the tooling is installed in the correct position. When rotating the docking seat 402 to replace the clamping plate 603 in different positions, the release component 407 plays a role. The operator presses down the lever 4072 on the rotating shaft 4071. The rear side of the lever 4072 rotates and compresses the spring 4062, causing the insert block 4061 to be pulled out from the insertion hole 4063. The positioning is released, and the docking seat 402 can be rotated to select the appropriate clamping plate 603. If the tooling needs to be disassembled, after pressing down the lever 4072, the locking block 4051 is pushed in the opposite direction to disengage it from the locking hole 4052, unlocking the clamping plate 403. Finally, the docking seat 402 is slid through the force ring 404 to easily remove the tooling and complete the disassembly process.

[0042] Furthermore, when it is necessary to clamp the circuit breaker housing, first select a suitable clamping plate 603 according to the housing size, place the circuit breaker housing between the two clamping plates 603, push the pressure plate 601 to slide on the top of the operating table 5, adjust the initial distance between the two pressure plates 601, and then operate the fastening assembly 604. The plate base 6041 is fixed to the front side of the right pressure plate 601, providing a rotation fulcrum for the pull plate 6042. Pull the pull ring 6043, which drives the pull plate 6042 to rotate around the plate base 6041. During the rotation of the pull plate 6042, it pulls the left pressure plate 601 to move to the right, so that the two pressure plates 601 gradually approach and clamp the two clamping plates 603. At this time, the pull ring 6043 and the left pressure plate 601 are at the same position. The front hook 6044 engages with the pull plate 6042. When the pull plate 6042 rotates to the appropriate position, the pull ring 6043 hooks onto the hook 6044, forming a locking structure to prevent the pressure plate 601 from loosening and ensure a stable clamping of the top of the housing. While the pressure plate 601 clamps the clamping plate 603, the clamping plate 603 slides along the inner wall of the rotating plate 602 to clamp the housing, further enhancing the fixing effect. When the welding is completed and the housing needs to be released, simply remove the pull ring 6043 from the hook 6044, push the pull plate 6042 in the opposite direction to separate the two pressure plates 601, and simultaneously slide the clamping plate 603 back along the inner wall of the rotating plate 602 to easily remove the housing, completing a full clamping and releasing operation.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A welding fixture for an SF6 circuit breaker housing, comprising a base (1), characterized in that: The base (1) is provided with a drive mechanism (2) at the top, a disassembly mechanism (4) is provided on the front side of the base (1), a base plate (3) is fixedly connected to the bottom of the base (1), a dust collection mechanism (7) is provided on the top of the base plate (3), an operating table (5) is fixedly connected to the top of the base plate (3), and a clamping mechanism (6) is provided on the top of the operating table (5). The disassembly mechanism (4) includes a mounting base (401), which is located on the front side of the base (1). A docking seat (402) is slidably connected to the inner wall of the mounting base (401). A retaining plate (403) is slidably connected to the inner wall of the mounting base (401). A plurality of force-applying rings (404) are fixedly connected to the outer wall of the docking seat (402). A locking component (405) is provided on the right side of the mounting base (401). A positioning component (406) is provided on the top of the docking seat (402). A release component (407) is provided inside the mounting base (401).

2. The welding fixture for an SF6 circuit breaker housing according to claim 1, characterized in that: The clamping mechanism (6) includes two pressure plates (601), the bottom of which is slidably connected to the top of the operating table (5). The bottom of the docking seat (402) is fixedly connected to a rotating plate (602). Two clamping plates (603) are slidably connected to the inner wall of the rotating plate (602). Fastening components (604) are provided on the front side of the two pressure plates (601).

3. The welding fixture for an SF6 circuit breaker housing according to claim 1, characterized in that: The drive mechanism (2) includes an air pump (201), the bottom of which is fixedly connected to the top of the base (1), and a telescopic rod (202) is fixedly connected to the top of the inner wall of the base (1), with the bottom end of the telescopic rod (202) fixedly connected to the top of the mounting base (401).

4. The welding fixture for an SF6 circuit breaker housing according to claim 1, characterized in that: The ash collection mechanism (7) includes two splash guards (701), the bottom of which is fixedly connected to the top of the operating table (5). The top of the operating table (5) is provided with an ash outlet (702), and the top of the base plate (3) is slidably connected with a collection box (703).

5. The welding fixture for an SF6 circuit breaker housing according to claim 1, characterized in that: The locking assembly (405) includes a locking block (4051), the left side of which is slidably connected to the right side of the outer wall of the mounting base (401), and a locking hole (4052) is provided on the top of the card plate (403).

6. The welding fixture for an SF6 circuit breaker housing according to claim 1, characterized in that: The positioning component (406) includes a plug (4061), the outer wall of which is slidably connected to the inner wall of the mounting base (401), a spring (4062) is fixedly connected to the top of the plug (4061), and a plurality of insertion holes (4063) are provided on the top of the docking base (402).

7. A welding fixture for an SF6 circuit breaker housing according to claim 6, characterized in that: The positioning assembly (407) includes a rotating shaft (4071), which is fixedly connected to the inner wall of the mounting base (401). A lever (4072) is rotatably connected to the outer wall of the rotating shaft (4071), and the rear side of the lever (4072) is rotatably connected to the front side of the spring (4062).

8. A welding fixture for an SF6 circuit breaker housing according to claim 2, characterized in that: The fastening assembly (604) includes a plate base (6041), the outer wall of which is fixedly connected to the front side of the right pressure plate (601), a pull plate (6042) is rotatably connected to the front side of the plate base (6041), a pull ring (6043) is rotatably connected to the inner wall of the pull plate (6042), and a pull hook (6044) is fixedly connected to the front side of the left pressure plate (601).

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