Stamping equipment with anti-shaking structure for automobile part machining

By designing anti-shaking clamping components and anti-shaking buffering components in the stamping equipment, the problem of existing stamping equipment lacking anti-shaking stable support mechanism when clamping automotive accessories is solved, and the efficient and stable nature of the accessories during the stamping process is achieved.

CN222519666UActive Publication Date: 2025-02-25SHENGXI AUTOMOBILE PARTS (MA AN SHAN) CO LTD
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Patent Information

Application Number
CN202421835404.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-31
Publication Date
2025-02-25
Estimated Expiration
2034-07-31

AI Technical Summary

Technical Problem

The existing stamping equipment lacks a stable support mechanism for anti-shaking when clamping automotive accessories, resulting in slight loosening of the accessories during stamping and severe compression shaking.

Method used

A stamping device with an anti-shaking structure is designed, including an anti-shaking clamping assembly and an anti-shaking buffer assembly. The anti-swing clamping assembly drives the movable sleeve block through a two-way drive motor and a two-way threaded rotary rod. The linkage vertical rod and the guide limit slot are used in conjunction with each other, so as to achieve the auto parts through the pressure-resistant crossbar, shock-absorbing side plate and pressure-bearing block. Stable support. Anti-shaking buffering components use hydraulic cylinders, stable lift plates, guide vertical plates and shock absorbing springs to provide buffering protection during stamping to reduce the pressure on accessories.

Benefits of technology

Through the design of anti-shaking clamping components, auto parts are not easily loosened due to external forces during stamping. The use of anti-shaking buffer components further improves stamping stability, reduces the pressure of the accessories, and achieves an efficient and stable stamping effect.

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Abstract

The utility model relates to the technical field of stamping equipment, in particular to stamping equipment with an anti-shaking structure for machining automobile parts. The technical problems that in the using process of stamping equipment, in the clamping process of automobile parts, an anti-shaking stable supporting mechanism is lacked, so that the phenomena of slight looseness and the like are likely to happen to the automobile parts in the stamping process, and meanwhile, due to the fact that certain pressure exists in stamping, the automobile parts shake due to pressure are solved. According to the technical scheme, the stamping equipment with the anti-shaking structure for machining the automobile parts comprises a stamping control box and an anti-shaking buffering assembly. The anti-shaking clamping assembly is arranged to stably support, adjust and clamp an automobile part, so that the automobile part cannot be loosened due to external force in the stamping process, and the stable stamping assembly has a certain damping and buffering effect in the stamping process through the anti-shaking buffering assembly. The pressure borne by the automobile parts can be reduced, and the stamping stability of the automobile parts is further improved.
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Description

Technical Field

[0001] The utility model relates to the technical field of stamping equipment, in particular to stamping equipment with an anti-sway structure for processing automobile parts. Background Art

[0002] The structure of the stamping equipment currently used for automobile parts processing on the market is relatively simple. In the process of clamping automobile parts, there is a lack of anti-sway and stable support mechanism, which causes the automobile parts to be slightly loose during stamping. At the same time, during the stamping process, since the stamping has a certain pressure, the automobile parts will shake due to pressure. Therefore, it is urgently necessary to set up a stamping equipment that can stably support and clamp automobile parts and has a certain buffering effect during the stamping process to meet the needs of efficient and stable use of stamping equipment. Utility Model Content

[0003] In order to overcome the problem that during the use of stamping equipment, when clamping auto parts, there is a lack of anti-swaying stable support mechanism, which makes auto parts prone to slight loosening during stamping. At the same time, since stamping has a certain pressure, the auto parts will shake due to pressure.

[0004] The technical solution of the utility model is: stamping equipment for processing automobile parts with an anti-sway structure, including a stamping control box, a positioning and mounting cross plate, a bottom lifting component, an anti-sway clamping component, a support frame plate, a stable stamping component, and an anti-sway buffer component; a positioning and mounting cross plate is fixedly connected inside the stamping control box; a bottom lifting component for lifting, adjusting and ejecting automobile parts is installed on the upper end of the positioning and mounting cross plate; an anti-sway clamping component for stably clamping automobile parts against sway is installed inside the stamping control box; a support frame plate is fixedly connected to the upper end of the stamping control box; a stable stamping component is installed on the outer side of the support frame plate; an anti-sway buffer component for providing buffering protection during the stamping process to improve the stamping stability is installed inside the stamping control box.

[0005] Preferably, the anti-sway clamping assembly can be used to stably support and adjust the clamping of automobile accessories, so that the automobile accessories will not become loose due to external force during the stamping process. The anti-sway buffer assembly is used to make the stable stamping assembly have a certain shock-absorbing and buffering effect during stamping, which can reduce the pressure on the automobile accessories and further improve the stability of the stamping of automobile accessories.

[0006] Preferably, the bottom lifting assembly includes a hydraulic lifting rod, a through slot and a bottom supporting plate; a hydraulic lifting rod is installed at the center of the upper end of the positioning and mounting cross plate; a through slot is opened inside the stamping control box; the movable end of the hydraulic lifting rod is installed with the bottom supporting plate, and the hydraulic lifting rod can be used to drive the bottom supporting plate to move up and down, thereby being able to lift and lower and adjust the position of the automotive accessories, and at the same time, it can be quickly ejected after the stamping is completed.

[0007] Preferably, the stamping control box includes a placement cavity, a limiting slide groove and an adjustment groove; a placement cavity is opened at the center of the stamping control box; adjustment grooves are opened on both sides of the stamping control box close to the placement cavity; a limiting slide groove is provided at the lower end of the adjustment groove, and the automotive parts are placed in the placement cavity for stamping processing.

[0008] Preferably, the anti-sway clamping assembly includes a protective outer frame plate, a two-way drive motor, a two-way threaded rotating rod, a movable sleeve block, a linkage vertical rod, a guide limit groove, a pressure-resistant cross bar, a shock-absorbing side plate, a pressure block and an anti-slip clamping plate; a protective outer frame plate is installed at the bottom end of the inside of the stamping control box; a two-way drive motor is installed at the center of the inner part of the protective outer frame plate; a two-way threaded rotating rod is installed at the output end of the two-way drive motor; a movable sleeve block is threadedly connected to the outer side of the two-way threaded rotating rod, and when the auto parts are placed and need to be clamped, the two-way drive motor is started so that the two-way threaded rotating rod can drive the movable sleeve block to move left and right.

[0009] Preferably, a linkage vertical rod is installed at the upper end of the movable sleeve block; a guide limit groove used in conjunction with the linkage vertical rod is opened inside the positioning and mounting cross plate; a pressure-resistant cross rod is fixedly connected to the top end of the inner side of the linkage vertical rod; a shock-absorbing side plate is installed at the side end of the pressure-resistant cross rod; a pressure-bearing block is installed at the side end of the shock-absorbing side plate; an anti-slip clamping plate is installed at the side end of the pressure-bearing block, and the linkage vertical rod passes through the guide limit groove to play a role in stabilizing movement, and the anti-slip clamping plate can stably support and adjust the automobile accessories through the pressure-resistant cross rod, the shock-absorbing side plate and the pressure-bearing block, so that the automobile accessories will not loosen due to external force during the stamping process.

[0010] Preferably, the stabilizing stamping assembly includes a hydraulic cylinder, a stabilizing lifting plate, a guide vertical plate, a guide vertical groove, a guide slider, a positioning pressure plate and a punching head; a hydraulic cylinder is installed on the upper end of the support frame plate; a stabilizing lifting plate is installed on the movable end of the hydraulic cylinder; guide vertical plates are installed on both sides of the upper end of the stamping control box; a guide vertical groove is opened inside the guide vertical plate; guide sliders sliding in the guide vertical grooves are fixedly connected on both sides of the stabilizing lifting plate; a positioning pressure plate is fixedly connected to the lower end of the stabilizing lifting plate; a punching head is installed on the lower end of the positioning pressure plate, and starting the hydraulic cylinder can drive the stabilizing lifting plate to move downward, and at the same time, the guide slider can slide in the guide vertical groove opened inside the guide vertical plate, thereby ensuring the stability of the punching of the punching head.

[0011] Preferably, the anti-sway buffer component has a buffer groove, a pressure-bearing bottom frame plate, a shock-absorbing spring and a limit buffer frame plate inside; a buffer groove is opened inside the stamping control box; a pressure-bearing bottom frame plate is installed inside the buffer groove; a shock-absorbing spring is installed on the upper end of the pressure-bearing bottom frame plate; a damper is installed on the outside of the shock-absorbing spring; a limit buffer frame plate is installed on the upper end of the shock-absorbing spring. When the stable lifting plate drives the positioning pressure plate to move downward for stamping, the pressure-bearing bottom frame plate, the shock-absorbing spring and its limit buffer frame plate can play a buffering and pressure-sharing role, which can reduce the pressure on automobile parts and further improve the stability of stamping of automobile parts.

[0012] Beneficial effects of the utility model:

[0013] 1. The anti-sway clamping assembly can be used to stably support and adjust the clamping of auto parts, so that the auto parts will not loosen due to external force during the stamping process. The anti-sway buffer assembly makes the stable stamping assembly have a certain shock-absorbing and buffering effect during stamping, which can reduce the pressure on the auto parts and further improve the stability of the stamping of auto parts. Compared with the existing stamping equipment, there is a lack of anti-sway and stable support mechanism in the process of clamping auto parts, which makes the auto parts prone to slight loosening during stamping. At the same time, during the stamping process, since the stamping has a certain pressure, the auto parts will shake due to pressure. In terms of this stamping equipment, the effect of efficient and stable stamping can be achieved;

[0014] 2. When the auto parts are placed and need to be clamped, start the bidirectional drive motor so that the bidirectional threaded rotating rod can drive the movable sleeve to move left and right, and the linkage vertical rod passes through the guide limit groove to play a role in stable movement. The anti-slip clamping plate can stably support and adjust the auto parts through the pressure-resistant cross bar, shock-absorbing side plate and pressure-bearing block, so that the auto parts will not be loosened due to external force during the stamping process;

[0015] 3. When the stable lifting plate drives the positioning plate to move downward for stamping, the pressure-bearing bottom frame plate, shock-absorbing spring and its limit buffer frame plate can play a buffering and pressure-dividing role, which can reduce the pressure on the auto parts and further improve the stability of the stamping of auto parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 What is shown is a three-dimensional structural schematic diagram of the punching equipment of the utility model;

[0017] Figure 2 Shown is a schematic diagram of the disassembled structure of the bottom supporting plate of the stamping equipment of the utility model;

[0018] Figure 3 What is shown is a three-dimensional structural schematic diagram of a placement cavity of a punching device of the utility model;

[0019] Figure 4 Shown is a schematic diagram of the internal structure of the protective outer frame plate of the stamping equipment of the utility model;

[0020] Figure 5 What is shown is a three-dimensional structural schematic diagram of the pressure-bearing bottom frame plate of the stamping equipment of the utility model.

[0021] Explanation of reference numerals: 1. stamping control box; 2. positioning and mounting horizontal plate; 3. bottom lifting assembly; 4. anti-sway clamping assembly; 5. support frame plate; 6. stable stamping assembly; 7. anti-sway buffer assembly; 101. placement cavity; 102. limit slide groove; 103. adjustment groove; 301. hydraulic lifting rod; 302. through groove; 303. bottom supporting plate; 401. protective outer frame plate; 402. two-way drive motor; 403. two-way threaded rotating rod; 404. movable Movable sleeve block; 405, linkage vertical rod; 406, guide limit groove; 407, pressure-resistant cross bar; 408, shock-absorbing side plate; 409, pressure block; 410, anti-skid clamping plate; 601, hydraulic cylinder; 602, stable lifting plate; 603, guide vertical plate; 604, guide vertical groove; 605, guide slide block; 606, positioning pressure plate; 607, punch head; 701, buffer groove; 702, pressure-bearing bottom frame plate; 703, shock-absorbing spring; 704, limit buffer frame plate. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0023] See also Figure 1-3The utility model provides an embodiment: a stamping device for processing automobile parts with an anti-sway structure, comprising a stamping control box 1, a positioning and mounting cross plate 2, a bottom lifting component 3, an anti-sway clamping component 4, a support frame plate 5, a stable stamping component 6, and an anti-sway buffer component 7; the stamping control box 1 is fixedly connected with a positioning and mounting cross plate 2; the upper end of the positioning and mounting cross plate 2 is installed with a bottom lifting component 3 for lifting, adjusting and ejecting automobile parts; the stamping control box 1 is installed with an anti-sway clamping component 4 for stably clamping automobile parts against sway; the upper end of the stamping control box 1 is fixedly connected with a support frame plate 5; a stable stamping component 6 is installed on the outside of the support frame plate 5; the stamping control box 1 is installed with an anti-sway buffer component 7 for buffering protection during the stamping process to improve the stamping stability, the anti-sway clamping component 4 can be used to stably support, adjust and clamp the automobile parts, so that the automobile parts will not be loosened due to external force during the stamping process, and the anti-sway buffer component 7 is used to stabilize the stamping component 6 during the process There is a certain shock-absorbing and buffering effect during stamping, which can reduce the pressure on auto parts and further improve the stability of auto parts stamping. The bottom lifting component 3 includes a hydraulic lifting rod 301, a through slot 302 and a bottom supporting plate 303; a hydraulic lifting rod 301 is installed at the center of the upper end of the positioning and mounting cross plate 2; a through slot 302 is opened inside the stamping control box 1; a bottom supporting plate 303 is installed at the movable end of the hydraulic lifting rod 301, and the bottom supporting plate 303 can be driven by the hydraulic lifting rod 301 It can move up and down, so as to adjust the position of the automobile parts. At the same time, it can be quickly ejected after the stamping is completed. The stamping control box 1 includes a placement cavity 101, a limiting slide groove 102 and an adjustment groove 103; a placement cavity 101 is opened at the center of the stamping control box 1; adjustment grooves 103 are opened on both sides of the stamping control box 1 near the placement cavity 101; a limiting slide groove 102 is provided at the lower end of the adjustment groove 103, and the automobile parts are placed in the placement cavity 101 for stamping processing.

[0024] See also Figure 4In this embodiment, the anti-sway clamping assembly 4 includes a protective outer frame plate 401, a two-way drive motor 402, a two-way threaded rotating rod 403, a movable sleeve block 404, a linkage vertical rod 405, a guide limit groove 406, a compression cross bar 407, a shock-absorbing side plate 408, a pressure block 409 and an anti-slip clamping plate 410; a protective outer frame plate 401 is installed at the bottom end of the stamping control box 1; a two-way drive motor 402 is installed at the center of the protective outer frame plate 401; a two-way threaded rotating rod 403 is installed at the output end of the two-way drive motor 402; the outer side of the two-way threaded rotating rod 403 is threadedly connected with a movable sleeve block 404. When the auto parts are placed and need to be clamped, the two-way drive motor 402 is started so that the two-way threaded rotating rod 403 can drive the movable sleeve block 40 4 moves left and right, a linkage vertical rod 405 is installed on the upper end of the movable sleeve block 404; a guide limiting groove 406 used in conjunction with the linkage vertical rod 405 is opened inside the positioning installation horizontal plate 2; a pressure-resistant cross bar 407 is fixedly connected to the top of the inner side of the linkage vertical rod 405; a shock-absorbing side plate 408 is installed on the side end of the pressure-resistant cross bar 407; a pressure-bearing block 409 is installed on the side end of the shock-absorbing side plate 408; an anti-skid clamping plate 410 is installed on the side end of the pressure-bearing block 409, and the linkage vertical rod 405 passes through the guide limiting groove 406 to play a role in stable movement, and the anti-skid clamping plate 410 can stably support and adjust the automobile parts through the pressure-resistant cross bar 407, the shock-absorbing side plate 408 and the pressure block 409, so that the automobile parts will not be loosened due to external force during the stamping process.

[0025] See also Figure 5In this embodiment, the stable stamping assembly 6 includes a hydraulic cylinder 601, a stable lifting plate 602, a guide vertical plate 603, a guide vertical groove 604, a guide slider 605, a positioning plate 606 and a punching head 607; a hydraulic cylinder 601 is installed on the upper end of the support frame plate 5; a stable lifting plate 602 is installed on the movable end of the hydraulic cylinder 601; guide vertical plates 603 are installed on both sides of the upper end of the stamping control box 1; a guide vertical groove 604 is opened inside the guide vertical plate 603; guide sliders 605 sliding in the guide vertical groove 604 are fixedly connected on both sides of the stable lifting plate 602; a positioning plate 606 is fixedly connected to the lower end of the stable lifting plate 602; a punching head 607 is installed on the lower end of the positioning plate 606, and starting the hydraulic cylinder 601 can drive the stable lifting plate 602 to move downward, and the guide slider 605 can be on the guide vertical plate The sliding in the guide vertical groove 604 opened inside 603 ensures the stamping stability of the punching head 607. The anti-sway buffer component 7 has a buffer groove 701, a pressure-bearing bottom frame plate 702, a shock-absorbing spring 703 and a limit buffer frame plate 704 inside; the stamping control box 1 has a buffer groove 701 inside; the pressure-bearing bottom frame plate 702 is installed inside the buffer groove 701; the shock-absorbing spring 703 is installed on the upper end of the pressure-bearing bottom frame plate 702; a damper is installed on the outside of the shock-absorbing spring 703; and a limit buffer frame plate 704 is installed on the upper end of the shock-absorbing spring 703. When the stabilizing lifting plate 602 drives the positioning pressure plate 606 to move downward for stamping, the pressure-bearing bottom frame plate 702, the shock-absorbing spring 703 and its limit buffer frame plate 704 can play a buffering and pressure-sharing role, which can reduce the pressure on the automobile parts and further improve the stability of the stamping of the automobile parts.

[0026] During operation, the automobile parts are placed in the placement cavity 101 for stamping processing, and the bottom supporting plate 303 can be driven up and down by the hydraulic lifting rod 301, so as to adjust the position of the automobile parts by lifting and lowering, and the ejection process can be carried out quickly after the stamping is completed;

[0027] When the automobile parts are placed and need to be clamped, the bidirectional driving motor 402 is started, so that the bidirectional threaded rotating rod 403 can drive the movable sleeve block 404 to move left and right, and the linkage vertical rod 405 passes through the guide limit groove 406 to play a role in stable movement, and the anti-slip clamping plate 410 can stably support and adjust the clamping of the automobile parts through the anti-pressure cross bar 407, the shock-absorbing side plate 408 and the pressure block 409, so that the automobile parts will not be loosened due to external forces during the stamping process;

[0028] Then, the hydraulic cylinder 601 is started to drive the stable lifting plate 602 to move downward, and at the same time, the guide slider 605 can slide in the guide vertical groove 604 provided inside the guide vertical plate 603, thereby ensuring the stability of the punching by the punch head 607;

[0029] When the stabilizing lifting plate 602 drives the positioning pressure plate 606 to move downward for stamping, the pressure-bearing bottom frame plate 702, the shock-absorbing spring 703 and its limiting buffer frame plate 704 can play a buffering and pressure-dividing role, which can reduce the pressure on the auto parts and further improve the stability of the stamping of the auto parts.

[0030] Through the above steps, the anti-sway clamping component 4 can stably support and adjust the clamping of the automobile accessories, so that the automobile accessories will not loosen due to external force during the stamping process, and the anti-sway buffer component 7 is used to make the stable stamping component 6 have a certain shock-absorbing and buffering effect during stamping, which can reduce the pressure on the automobile accessories and further improve the stability of the stamping of automobile accessories. In order to solve the problem that during the use of the stamping equipment and in the process of clamping the automobile accessories, there is a lack of anti-sway stable support mechanism, which makes the automobile accessories prone to slight loosening during stamping. At the same time, since the stamping has a certain pressure, the automobile accessories will shake due to pressure.

[0031] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A stamping device for processing automobile parts with an anti-sway structure, comprising a stamping control box (1); characterized in that: The invention also comprises a positioning installation transverse plate (2), a bottom lifting component (3), an anti-sway clamping component (4), a support frame plate (5), a stable stamping component (6), and an anti-sway buffer component (7); the stamping control box (1) is fixedly connected with the positioning installation transverse plate (2); the upper end of the positioning installation transverse plate (2) is installed with the bottom lifting component (3) for lifting and adjusting and ejecting the automobile parts; the stamping control box (1) is installed with the anti-sway clamping component (4) for stably clamping the automobile parts against sway; the upper end of the stamping control box (1) is fixedly connected with the support frame plate (5); the outer side of the support frame plate (5) is installed with the stable stamping component (6); the stamping control box (1) is installed with the anti-sway buffer component (7) for providing buffer protection during the stamping process to improve the stamping stability.

2. The stamping equipment for automobile parts processing with an anti-sway structure according to claim 1 is characterized in that: The bottom lifting assembly (3) comprises a hydraulic lifting rod (301), a through slot (302) and a bottom supporting plate (303); the hydraulic lifting rod (301) is installed at the center of the upper end of the positioning and mounting cross plate (2); the through slot (302) is provided inside the stamping control box (1); and the bottom supporting plate (303) is installed at the movable end of the hydraulic lifting rod (301).

3. The stamping equipment for automobile parts processing with an anti-sway structure according to claim 1 is characterized in that: The stamping control box (1) comprises a placement cavity (101), a limiting slide groove (102) and an adjustment groove (103); the placement cavity (101) is provided at the center of the stamping control box (1); the adjustment grooves (103) are provided on both sides of the stamping control box (1) near the placement cavity (101); and the limiting slide groove (102) is provided at the lower end of the adjustment groove (103).

4. The stamping equipment for automobile parts processing with an anti-sway structure according to claim 1 is characterized in that: The anti-sway clamping assembly (4) comprises a protective outer frame plate (401), a bidirectional driving motor (402), a bidirectional threaded rotating rod (403), a movable sleeve block (404), a linkage vertical rod (405), a guide limit groove (406), a pressure-resistant cross bar (407), a shock-absorbing side plate (408), a pressure-bearing block (409) and an anti-slip clamping plate (410); the protective outer frame plate (401) is installed at the bottom end of the interior of the stamping control box (1); the bidirectional driving motor (402) is installed at the center of the interior of the protective outer frame plate (401); the bidirectional threaded rotating rod (403) is installed at the output end of the bidirectional driving motor (402); and the movable sleeve block (404) is threadedly connected to the outer side of the bidirectional threaded rotating rod (403).

5. The stamping equipment for automobile parts processing with an anti-sway structure according to claim 4 is characterized in that: A linkage vertical rod (405) is installed at the upper end of the movable sleeve block (404); a guide limit groove (406) used in conjunction with the linkage vertical rod (405) is provided inside the positioning installation horizontal plate (2); a pressure-resistant cross bar (407) is fixedly connected to the top end of the inner side of the linkage vertical rod (405); a shock-absorbing side plate (408) is installed at the side end of the pressure-resistant cross bar (407); a pressure-bearing block (409) is installed at the side end of the shock-absorbing side plate (408); and an anti-slip clamping plate (410) is installed at the side end of the pressure-bearing block (409).

6. The stamping equipment for automobile parts processing with an anti-sway structure according to claim 1, characterized in that: The stabilizing stamping assembly (6) comprises a hydraulic cylinder (601), a stabilizing lifting plate (602), a guide vertical plate (603), a guide vertical groove (604), a guide slider (605), a positioning plate (606) and a stamping head (607); the hydraulic cylinder (601) is installed at the upper end of the support frame plate (5); the stabilizing lifting plate (602) is installed at the movable end of the hydraulic cylinder (601); the guide vertical plates (603) are installed on both sides of the upper end of the stamping control box (1); the guide vertical groove (604) is provided inside the guide vertical plate (603); the guide sliders (605) sliding in the guide vertical groove (604) are fixedly connected to both sides of the stabilizing lifting plate (602); the positioning plate (606) is fixedly connected to the lower end of the stabilizing lifting plate (602); and the stamping head (607) is installed at the lower end of the positioning plate (606).

7. The stamping equipment for automobile parts processing with an anti-sway structure according to claim 1 is characterized in that: The anti-sway buffer component (7) has a buffer groove (701), a pressure-bearing bottom frame plate (702), a shock-absorbing spring (703) and a limit buffer frame plate (704) inside; the stamping control box (1) has a buffer groove (701) inside; the pressure-bearing bottom frame plate (702) is installed inside the buffer groove (701); the shock-absorbing spring (703) is installed at the upper end of the pressure-bearing bottom frame plate (702); a damper is installed outside the shock-absorbing spring (703); and the limit buffer frame plate (704) is installed at the upper end of the shock-absorbing spring (703).