Automobile air spring detection device

By incorporating anti-deviation and clamping components into the air spring testing device, and utilizing components such as hydraulic cylinders and dispersion plates to achieve uniform pressure distribution, the problem of air spring deviation or tilting during testing is solved, ensuring testing accuracy and clamping stability.

CN224051532UActive Publication Date: 2026-03-27CHANGSHA JIANGKAI AUTO PARTS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-05-14
Publication Date
2026-03-27

AI Technical Summary

Technical Problem

Existing automotive air spring testing devices lack effective anti-deviation mechanisms, which may cause the air spring to deviate or tilt during the compression process, resulting in distorted test data.

Method used

By setting up anti-deviation parts and clamping parts, the hydraulic cylinder descends to apply downward pressure to the air spring, the dispersion plate transmits the pressure to the dispersion column and then to the top seat. Combined with the outer ring support ring of the top seat sliding limit with the column, and the base fixing the bottom cover of the air spring, the pressure is evenly distributed, avoiding deviation or tilting.

Benefits of technology

It effectively prevents air springs from shifting or tilting under pressure, ensuring the accuracy of testing, and enables quick and stable clamping and fixing of air springs of different specifications, ensuring the accuracy of test data.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses an automobile air spring detection device, and relates to the technical field of automobile part detection. The device comprises a supporting box, an air spring is installed above the supporting box, a barometer is installed on the front face of the top of the supporting box, the device further comprises an anti-deviation part, the anti-deviation part is installed on the top of the supporting box, and the anti-deviation part is used for preventing deviation when the air spring is ballasted; and the clamping part is arranged in the anti-deviation part. The anti-deviation part is arranged, specifically, the hydraulic cylinder is started to descend to apply downward pressure to the air spring, the dispersion plate transmits the pressure to the four dispersion columns and transmits the pressure to the top base, the dispersion plate is matched with the dispersion columns to achieve uniform pressure, and the four supporting rings on the outer ring of the top base and the stand columns are in sliding limiting. The air spring bottom cover is fixed in the installation groove through the base, the stand column, the top base and the base are matched together, the air spring can be effectively prevented from deviating or inclining when being pressed, and the detection accuracy is guaranteed.
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Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of automobile part detection, especially, relate to a kind of automobile air spring detection device. BACKGROUND

[0002] Automobile air spring is as the core component of air suspension system, supports vehicle body weight and buffers road impact by gas pressure in air bag, and its performance directly influences the comfort, steering stability and safety of vehicle, with the improvement of new energy vehicle and high-end passenger car to suspension system requirement, air spring needs to meet more stringent detection standard, especially the sealing reliability under high pressure working condition;

[0003] The existing test device usually adopts pressure drop method to detect the leakage rate of air bag and connecting component, and judges the sealing structure reliability, but the existing device lacks effective anti-deviation device, so that air spring may deviate or tilt during pressure drop process, resulting in distorted test data, therefore we propose a kind of automobile air spring detection device. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of automobile air spring detection device, by setting up anti-deviation part, specifically is to start hydraulic cylinder and descend to air spring and exert downward pressure, dispersion plate transmits pressure to four dispersion columns and conducts to top seat, and pressure is evenly distributed by dispersion plate and dispersion column cooperation, four support rings of top seat outer circle and column slide limit, base cap is fixed in mounting groove in air spring bottom by base, and column, top seat and base cooperate together, can effectively avoid air spring to deviate or tilt when being pressed, guarantee the accuracy of detection, solve the problem that the existing test device lacks effective anti-deviation device, so that air spring may deviate or tilt during pressure drop process, resulting in distorted test data.

[0005] To solve the above technical problems, the utility model is realized by the following technical schemes:

[0006] The utility model is a kind of automobile air spring detection device, including support box, air spring is installed on the top of support box, pressure gauge is installed on the top of support box, further including:

[0007] Anti-deviation part, the anti-deviation part is installed on the top of support box, and the anti-deviation part is used to prevent air spring from deviating when being loaded;

[0008] Clamping part, the clamping part is installed inside anti-deviation part, and the clamping part is used to clamp and fix air spring.

[0009] Wherein, the pressure gauge is connected with the air outlet pipe of air spring bottom cover, for observing whether air spring is damaged.

[0010] Further, the anti-deviation part comprises a top plate, four stand columns are fixedly connected to the bottom of the top plate, a top base is arranged below the top plate, four support rings are fixedly connected to the outer ring of the top base, and the top base is in sliding and limiting cooperation with the stand columns through the support rings;

[0011] A ballast assembly is installed at the bottom of the top plate, and the ballast assembly is used for ballasting the air spring;

[0012] The bottom of each of the four stand columns is fixedly connected to the top of the support box, and the four stand columns are fixed to the four corners of the bottom of the top base, and the stand columns limit the top base.

[0013] Further, the clamping part comprises three clamping blocks;

[0014] A moving assembly is installed at the bottom of the top base, and the moving assembly is used for moving the clamping blocks;

[0015] The clamping blocks are arranged in an inner arc shape and are matched with the top cover of the air spring.

[0016] Further, the ballast assembly comprises a hydraulic cylinder, the top of the hydraulic cylinder is fixedly connected to the bottom of the top plate, the bottom output end of the hydraulic cylinder is fixedly connected to a dispersion plate, and the bottom of the dispersion plate is fixedly connected to four dispersion columns;

[0017] The bottom of each of the four dispersion columns is fixedly connected to the top of the top base, and the four dispersion columns are fixed to the four corners of the bottom of the dispersion plate, and the four dispersion columns disperse the downward pressure.

[0018] Further, the top of the support box is fixedly connected to a fixed plate, a special-shaped clamping groove is formed in the inside of the fixed plate, a base is slidably connected in the special-shaped clamping groove, and an installation groove is formed in the inside of the base;

[0019] The bottom cover of the air spring is matched with the installation groove, and the installation groove prevents the air spring from deviating.

[0020] Further, the top of the top base is fixedly connected to a motor, the bottom output end of the motor is fixedly connected to a rotating circular block, the rotating circular block is rotatably connected to the inner wall of the top base, and three arc-shaped grooves are formed in the inside of the rotating circular block;

[0021] The rotating circular block is rotatably connected to the inner wall of the top base, the top base limits the rotating circular block, and the top base keeps the rotating circular block stable during rotation.

[0022] Further, the moving assembly comprises a moving block, the moving block is in sliding and limiting cooperation with the clamping block, a limiting block is fixedly connected to the top of the moving block, and a limiting column is fixedly connected to the top of the limiting block;

[0023] The top base is provided with three limiting grooves in the bottom, the limiting block is in sliding limiting cooperation with the limiting groove, the limiting column is in sliding limiting cooperation with the arc-shaped groove, and the limiting column is fixedly connected with the anti-falling ring at the top.

[0024] Further, the moving block is fixedly connected with a sleeve on the outside, a locking column is slidably connected in the moving block, a handle is fixedly connected to the side of the locking column away from the moving block, a limiting round block is fixedly connected to the outer surface of the locking column, a spring is sleeved on the outer surface of the locking column, one end of the spring is fixedly connected with the inner wall of the sleeve, and the other end of the spring is fixedly connected with the limiting round block.

[0025] The locking column is slidably penetrated through the moving block and the clamping block, and is used for fixing the clamping block in the moving block, and the locking column is in sliding limiting cooperation with the inner wall of the sleeve through the limiting round block.

[0026] The utility model has the advantages of the following beneficial effects:

[0027] 1. The utility model discloses a kind of air spring detection devices, including air spring, the air spring is fixedly connected with the hydraulic cylinder, the hydraulic cylinder is fixedly connected with the motor, the motor is fixedly connected with the rotating block, the rotating block is fixedly connected with the limiting column, the limiting column is fixedly connected with the moving block, the moving block is fixedly connected with the clamping block, the clamping block is fixedly connected with the base, the base is fixedly connected with the stand, the stand is fixedly connected with the top base, the top base is fixedly connected with the dispersion plate, the dispersion plate is fixedly connected with four dispersion columns, the dispersion column is fixedly connected with the top base, the top base is fixedly connected with four support rings, the stand is fixedly connected with the base, the base is fixedly connected with the installation groove, the air spring bottom cover is fixed in the installation groove, the stand, the top base and the base are cooperated, air spring can be effectively avoided to appear deviation or inclination when being pressed, and the accuracy of detection is guaranteed.

[0028] 2. The utility model discloses a kind of air spring detection devices, including air spring, the air spring is fixedly connected with the hydraulic cylinder, the hydraulic cylinder is fixedly connected with the motor, the motor is fixedly connected with the rotating block, the rotating block is fixedly connected with the limiting column, the limiting column is fixedly connected with the moving block, the moving block is fixedly connected with the clamping block, the clamping block is fixedly connected with the base, the base is fixedly connected with the stand, the stand is fixedly connected with the top base, the top base is fixedly connected with the dispersion plate, the dispersion plate is fixedly connected with four dispersion columns, the dispersion column is fixedly connected with the top base, the top base is fixedly connected with four support rings, the stand is fixedly connected with the base, the base is fixedly connected with the installation groove, the air spring bottom cover is fixed in the installation groove, the stand, the top base and the base are cooperated, air spring can be effectively avoided to appear deviation or inclination when being pressed, and the accuracy of detection is guaranteed.

[0029] Of course, any product implementing the utility model does not necessarily need to achieve all the advantages described above. DRAWINGS

[0030] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be to the embodiment description needed to use the drawing briefly introduced, obviously, the following description in drawing only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, can also obtain other drawings according to these drawings.

[0031] Figure 1 It is the whole structure schematic diagram of the utility model;

[0032] Figure 2 It is the overall structure schematic view of the ballast assembly of the utility model;

[0033] Figure 3 It is the internal structure schematic view of the top seat of the utility model;

[0034] Figure 4 It is the structure schematic view of the limiting groove of the utility model;

[0035] Figure 5 It is the structure schematic view of the clamping block of the utility model;

[0036] Figure 6 It is the structure schematic view of the utility model Figure 5 It is the enlarged structure schematic view of A of the utility model;

[0037] Figure 7 It is the structure schematic view of the installation groove of the utility model.

[0038] In the drawings, the component list represented by each sign is as follows:

[0039] 1, support box; 11, air spring; 12, air pressure gauge; 2, anti-offset part; 21, top plate; 22, ballast assembly; 221, hydraulic cylinder; 222, dispersion plate; 223, dispersion column; 23, stand column; 24, top seat; 241, support ring; 242, limiting groove; 25, fixed plate; 251, base; 252, installation groove; 253, special-shaped clamping groove; 3, clamping part; 311, rotating round block; 312, arc-shaped groove; 32, motor; 33, moving assembly; 331, moving block; 332, clamping block; 333, limiting block; 334, limiting column; 335, sleeve; 336, locking column; 337, handle; 338, limiting round block; 339, spring. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0041] Please refer to Figures 1-7 The utility model discloses an automobile air spring detection device, which comprises a support box 1, an air spring 11 is installed above the support box 1, an air pressure gauge 12 is installed on the top front of the support box 1, and the automobile air spring detection device further comprises:

[0042] An anti-offset part 2 is installed on the top of the support box 1, and the anti-offset part 2 is used for preventing the air spring 11 from being offset when the air spring 11 is ballasted.

[0043] The clamping part 3 is installed in the interior of the anti-deviation part 2, and is used for clamping and fixing the air spring 11.

[0044] The air pressure gauge 12 is connected with the air outlet pipe of the bottom cover of the air spring 11, and is used for observing whether the air spring 11 is damaged.

[0045] The anti-deviation part 2 comprises a top plate 21, four stand columns 23 are fixedly connected to the bottom of the top plate 21, a top base 24 is arranged below the top plate 21, four support rings 241 are fixedly connected to the outer ring of the top base 24, and the top base 24 is in sliding limiting cooperation with the stand columns 23 through the support rings 241.

[0046] The ballast assembly 22 is installed at the bottom of the top plate 21, and is used for ballasting the air spring 11.

[0047] The bottom of each of the four stand columns 23 is fixedly connected to the top of the support box 1, and the stand columns 23 are fixed to the four corners of the bottom of the top base 24, and the stand columns 23 limit the top base 24.

[0048] The clamping part 3 comprises three clamping blocks 332.

[0049] The moving assembly 33 is installed at the bottom of the top base 24, and is used for moving the clamping blocks 332.

[0050] The clamping blocks 332 are arranged in an inner arc shape, and are matched with the top cover of the air spring 11.

[0051] The ballast assembly 22 comprises a hydraulic cylinder 221, the top of the hydraulic cylinder 221 is fixedly connected to the bottom of the top plate 21, a dispersion plate 222 is fixedly connected to the bottom output end of the hydraulic cylinder 221, and four dispersion columns 223 are fixedly connected to the bottom of the dispersion plate 222.

[0052] The top of each of the four dispersion columns 223 is fixedly connected to the top of the top base 24, and the dispersion columns 223 are fixed to the four corners of the bottom of the dispersion plate 222, and the dispersion columns 223 disperse the downward pressure.

[0053] The support box 1 is fixedly connected with a fixed plate 25, a special-shaped clamping groove 253 is arranged in the fixed plate 25, a base 251 is slidably connected in the special-shaped clamping groove 253, and a mounting groove 252 is arranged in the base 251; the starting hydraulic cylinder 221 is lowered to exert a downward pressure on the air spring 11, the dispersion plate 222 transmits the pressure to the four dispersion columns 223 and conducts the pressure to the top seat 24, the dispersion plate 222 and the dispersion column 223 are matched to realize uniform pressure, the four support rings 241 on the outer circle of the top seat 24 are slidably limited by the stand column 23, the base 251 fixes the bottom cover of the air spring 11 in the mounting groove 252, and the stand column 23, the top seat 24 and the base 251 are matched together, so that the air spring 11 can be effectively prevented from deviating or tilting when being pressed, and the accuracy of detection is ensured.

[0054] The bottom cover of the air spring 11 is matched with the mounting groove 252, and the mounting groove 252 plays a role in preventing the air spring 11 from deviating.

[0055] The top seat 24 is fixedly connected with a motor 32, the bottom output end of the motor 32 is fixedly connected with a rotating circular block 311, the rotating circular block 311 is rotatably connected with the inner wall of the top seat 24, and three arc-shaped grooves 312 are arranged in the rotating circular block 311.

[0056] The rotating circular block 311 is rotatably connected with the inner wall of the top seat 24, the top seat 24 plays a role in limiting the rotating circular block 311, and the top seat 24 makes the rotating circular block 311 stable during rotation.

[0057] The moving assembly 33 comprises a moving block 331, the moving block 331 is slidably limited and matched with a clamping block 332, the moving block 331 is fixedly connected with a limiting block 333 at the top, and the limiting block 333 is fixedly connected with a limiting column 334 at the top.

[0058] The bottom of the top seat 24 is provided with three limiting grooves 242, the limiting block 333 is slidably limited and matched with the limiting groove 242, the limiting column 334 is slidably limited and matched with the arc-shaped groove 312, and the limiting column 334 is fixedly connected with an anti-falling ring at the top, so that the anti-falling ring plays a role in preventing the moving block 331 from falling.

[0059] The mobile block 331 is fixedly connected with a sleeve 335 outside, and the mobile block 331 is slidably connected with a locking column 336 inside. The locking column 336 is fixedly connected with a handle 337 on the side away from the mobile block 331. The locking column 336 is fixedly connected with a limiting circular block 338 on the outer surface. The locking column 336 is sleeved with a spring 339 on the outer surface. One end of the spring 339 is fixedly connected with the inner wall of the sleeve 335, and the other end of the spring 339 is fixedly connected with the limiting circular block 338. The rotating circular block 311 is driven to rotate clockwise by the starting motor 32. The limiting block 333 at the bottom of the limiting column 334 slides in the limiting groove 242. The top anti-falling ring limits the falling of the mobile block 331, so that the limiting column 334 slides in the arc-shaped groove 312, drives the three mobile blocks 331 and the clamping block 332 to approach each other, and realizes the clamping and fixing of the top cover of the air spring 11. The clamping part 3 can be self-adaptively adjusted, and different specifications of air springs 11 can be quickly and stably clamped and fixed.

[0060] The locking column 336 slides through the mobile block 331 and the clamping block 332. The locking column 336 is used for fixing the clamping block 332 inside the mobile block 331. The locking column 336 is slidably limited in cooperation with the inner wall of the sleeve 335 through the limiting circular block 338.

[0061] One specific application of the embodiment is as follows: when in use, the bottom cover of the air spring 11 is placed in the installation groove 252, and then the bottom air outlet pipe of the air spring 11 is connected with the air pressure gauge 12 through the air pipe. At this time, the hydraulic cylinder 221 is started to drive the dispersing plate 222 and the dispersing column 223 to move downward. The top seat 24 moves together. When the bottom of the top seat 24 contacts the top cover of the air spring 11, the hydraulic cylinder 221 is closed. At this time, the rotating circular block 311 is driven to rotate clockwise by the starting motor 32. Because the limiting block 333 at the bottom of the limiting column 334 slides in the limiting groove 242, and the anti-falling ring at the top of the limiting column 334 can prevent the mobile block 331 from falling when moving, the limiting column 334 will slide in the arc-shaped groove 312, so that the three mobile blocks 331 and the clamping block 332 approach each other, and the top cover of the air spring 11 is clamped and fixed. After the fixing is completed, the hydraulic cylinder 221 is started to slowly descend, and the air spring 11 is pressed downward. When the hydraulic cylinder 221 is pressed downward, the dispersing plate 222 transmits the downward pressure to the four dispersing columns 223 at the bottom. At the same time, the four dispersing columns 223 transmit the downward pressure to the top seat 24. The dispersing plate 222 and the four dispersing columns 223 cooperate to uniformly apply the downward pressure to the air spring 11, thereby effectively avoiding the problems of deviation or inclination of the air spring 11 when being pressed;

[0062] When the top base 24 moves, the four support rings 241 on the outer ring of the top base 24 are in sliding limiting cooperation with the four columns 23, and the bottom cover of the air spring 11 is fixed in the mounting groove 252 by the bottom base 251. Through the cooperation of the columns 23, the top base 24 and the bottom base 251, the air spring 11 can be effectively prevented from deviating or tilting when being pressed, so as to affect the accuracy of detection. At the same time, the staff observes the degree on the air pressure gauge 12 to detect whether the air spring 11 leaks. After the detection is completed, the hydraulic cylinder 221 is started to move upward, and then the motor 32 is started to rotate counterclockwise to release the clamping and fixing of the top cover of the air spring 11.

[0063] When different specifications of air springs 11 need to be detected, only the bottom base 251 needs to be replaced. The moving assembly 33 can be self-adapted to clamp. At this time, the handle on both sides of the bottom base 251 is gripped to take out the bottom base 251, and then the different specifications of the bottom base 251 are aligned with the special-shaped clamping groove 253 and put in.

[0064] In the description of the specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0065] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details and limit the utility model to the specific embodiments described. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments in order to better explain the principles and practical application of the utility model, so that the persons skilled in the art can well understand and utilize the utility model. The utility model is limited by the claims and the whole scope and equivalents thereof.

Claims

1. A vehicle air spring detection device, comprising a support box (1), an air spring (11) is installed above the support box (1), and an air pressure gauge (12) is installed on the top front of the support box (1), characterized in that, Also include: Anti-offset part (2), the anti-offset part (2) is installed on the top of the support box (1), the anti-offset part (2) is used for preventing offset when ballast air spring (11); And Clamping part (3), the clamping part (3) is installed inside the anti-offset part (2), the clamping part (3) is used for clamping and fixing the air spring (11); Wherein, the air pressure gauge (12) is connected with the air outlet pipe of the air spring (11) bottom cover, for observing whether the air spring (11) is damaged.

2. The automobile air spring detection device according to claim 1, wherein The anti-offset part (2) includes a top plate (21), the bottom of the top plate (21) is fixedly connected with four columns (23), a top seat (24) is arranged below the top plate (21), four support rings (241) are fixedly connected with the outer ring of the top seat (24), and the top seat (24) is slidably limited with the column (23) through the support ring (241). Ballast assembly (22), the ballast assembly (22) is installed on the bottom of the top plate (21), and the ballast assembly (22) is used for ballast air spring (11); Wherein, the bottom of the four columns (23) is fixedly connected with the top of the support box (1), the four columns (23) are fixed at the four corners of the bottom of the top seat (24), and the column (23) limits the top seat (24).

3. The automobile air spring detection device according to claim 2, wherein The clamping part (3) includes three clamping blocks (332); Moving assembly (33), the moving assembly (33) is installed on the bottom of the top seat (24), and the moving assembly (33) is used for moving the clamping block (332); Wherein, the clamping block (332) is arranged in an inner arc shape, and the clamping block (332) is matched with the top cover of the air spring (11).

4. The automobile air spring detection device according to claim 3, wherein The ballast assembly (22) includes a hydraulic cylinder (221), the top of the hydraulic cylinder (221) is fixedly connected with the bottom of the top plate (21), the bottom output end of the hydraulic cylinder (221) is fixedly connected with a dispersion plate (222), and the bottom of the dispersion plate (222) is fixedly connected with four dispersion columns (223). Wherein, the bottom of the four dispersion columns (223) is fixedly connected with the top of the top seat (24), the four dispersion columns (223) are fixed at the four corners of the bottom of the dispersion plate (222), and the four dispersion columns (223) play a role in dispersing the downward pressure.

5. The device according to claim 4, wherein The top of the support box (1) is fixedly connected with a fixed plate (25), the inside of the fixed plate (25) is provided with a special-shaped clamping groove (253), the inside of the fixed plate (25) is provided with a base (251), and the inside of the base (251) is provided with a mounting groove (252); Wherein, the bottom cover of the air spring (11) is matched with the mounting groove (252), and the mounting groove (252) plays a role in preventing the air spring (11) from offsetting.

6. The device according to claim 5, wherein The top of the top seat (24) is fixedly connected with a motor (32), the bottom output end of the motor (32) is fixedly connected with a rotating circular block (311), the rotating circular block (311) is rotatably connected with the inner wall of the top seat (24), and the inside of the rotating circular block (311) is provided with three arc grooves (312). The rotating circular block (311) is rotationally connected with the inner wall of the top base (24), the top base (24) limits the rotating circular block (311), and meanwhile, the top base (24) keeps the rotating circular block (311) stable during rotation.

7. The device according to claim 6, wherein The moving assembly (33) comprises a moving block (331) and a clamping block (332), the moving block (331) is in sliding limiting fit with the clamping block (332), the top of the moving block (331) is fixedly connected with a limiting block (333), and the top of the limiting block (333) is fixedly connected with a limiting column (334). The top of the limiting column (334) is fixedly connected with an anti-falling ring, the anti-falling ring prevents the moving block (331) from falling.

8. The device according to claim 7, wherein The outer side of the moving block (331) is fixedly connected with a sleeve pipe (335), the inside of the moving block (331) is slidably connected with a locking column (336), the side, away from the moving block (331), of the locking column (336) is fixedly connected with a handle (337), the outer surface of the locking column (336) is fixedly connected with a limiting circular block (338), the outer surface of the locking column (336) is sleeved with a spring (339), one end of the spring (339) is fixedly connected with the inner wall of the sleeve pipe (335), and the other end of the spring (339) is fixedly connected with the limiting circular block (338). The locking column (336) is slidably penetrated through the moving block (331) and the clamping block (332), the locking column (336) is used for fixing the clamping block (332) inside the moving block (331), and the locking column (336) is in sliding limiting fit with the inner wall of the sleeve pipe (335) through the limiting circular block (338).