Tool for machining split pump valve shaft seal

Abstract

The invention relates to the technical field of disassembly and assembly fixtures, and discloses a split type pump valve shaft seal machining tool which comprises a base, and a grinding assembly and a positioning assembly are arranged on the base and used for positioning and grinding the end face of a split type pump valve shaft seal. The split type pump valve shaft seal is placed through the multiple traction seats, the multiple traction seats are simultaneously driven to horizontally move through the locking structure, so that the split type pump valve shaft seal is clamped and positioned through the positioning blocks at the tops of the traction seats in different radial directions of the split type pump valve shaft seal, and due to the fact that the locking structure can simultaneously control the multiple traction seats, the split type pump valve shaft seal can be clamped and positioned. According to the split type pump valve shaft seal positioning device, the split type pump valve shaft seal can be accurately positioned, through the arrangement of the driving assembly and the sliding assembly, the grinding assembly can be gradually driven to be close to the split type pump valve shaft seal when the split type pump valve shaft seal is positioned, and the grinding assembly is far away from the hand of a worker when the split type pump valve shaft seal is placed; therefore, hands of workers are prevented from being injured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of disassembly and assembly fixture, and particularly relates to a split pump valve shaft seal processing tool. BACKGROUND

[0002] The split pump valve is a kind of pump or valve with a split structure design of core components, the essence of which is to split the traditional integral key components, such as pump body, valve, shaft seal, impeller, etc., into 2 or more parts, commonly 2 or 4 parts, to solve the problems of the integral pump valve in large-scale, installation and maintenance, and special-shaped working condition adaptation, while ensuring the sealing and mechanical properties of fluid conveying or interception, wherein the shaft sleeve is a core support component of the split pump valve shaft seal, and the shaft seal processing of the split pump valve involves multiple precision processes, especially the polishing of the shaft seal end face, which requires positioning and clamping through a special fixture to facilitate polishing processing.

[0003] The prior art provides a tool for pressing hydraulic shaft seal and dustproof ring, application number CN202510851285.8, which can simultaneously realize the pressing of shaft seal and dustproof ring, improve the pressing efficiency and quality, and comprises a lower pressing head mounted on the bottom plate of the pressing machine and an upper pressing head connected to the pressing head of the pressing machine, the top of the lower pressing head is provided with a lower cylindrical protrusion, the middle of the lower cylindrical protrusion is provided with a guide column, the upper pressing head is slidably sleeved with an upper pressing head guide sleeve, the middle of the bottom of the upper pressing head is provided with a guide counterbore matched with the guide column, the outer periphery of the upper pressing head is provided with a circular pressing plate, and the bottom of the circular pressing plate is provided with an upper circular ring protrusion.

[0004] However, the shaft seal processing tool in the prior art still has the following defects: When positioning the shaft seal through the processing tool, it is often necessary to fix the shaft seal through multiple clamping jaws from different directions, and most of these clamping jaws are controlled by independent power sources, so if one of the power sources deviates, the positioning process of the shaft seal will be affected, which will cause the shaft seal to be unable to be accurately positioned, thereby reducing the quality of subsequent end face polishing, and when the shaft seal is fixed on the tool, the hands of the worker will be very close to the polishing device, which will cause the polishing device to easily cause injury to the hands of the worker. SUMMARY

[0005] The purpose of the present application is to provide a technical solution for placing the split pump valve shaft seal through multiple traction seats, driving the multiple traction seats to move horizontally through the locking structure, clamping and positioning the split pump valve shaft seal along the different radial directions through the positioning blocks on the top of the traction seats, since the locking structure can control multiple traction seats simultaneously, the split pump valve shaft seal can be accurately positioned, thereby solving the problems of the prior art in the above background.

[0006] To achieve the above object, the present application adopts the following technical solutions: A split pump valve shaft seal processing tool, comprising a base, a polishing assembly and a positioning assembly are arranged on the base, and the end face of the split pump valve shaft seal is positioned and polished, the positioning assembly comprises a positioning block, a center disc and a traction seat, the positioning block is fixedly connected to the traction seat, the center disc is fixedly connected to the base, at least three traction seats are uniformly distributed and horizontally slidably connected to the center disc, the split pump valve shaft seal is placed on the plurality of traction seats and coaxially located above the center disc, the side surface of the plurality of positioning blocks abuts against the side surface of the split pump valve shaft seal; The positioning assembly further comprises a locking structure, the locking structure is arranged on the center disc and cooperates with the plurality of traction seats to drive the plurality of traction seats to elastically move along the radial direction of the center disc, so that the split pump valve shaft seal is positioned by the plurality of positioning blocks; The base is further provided with a driving assembly and a sliding assembly, the driving assembly is connected with the locking structure, the polishing assembly is connected with the driving assembly through the sliding assembly, the driving assembly is used to drive the locking structure to act to position the split pump valve shaft seal, and the driving assembly also drives the polishing assembly to approach the split pump valve shaft seal to polish the end face of the split pump valve shaft seal when the driving assembly acts.

[0007] Preferably, the locking structure comprises an adjusting disc, a limiting protrusion and an inclined groove, the adjusting disc is coaxially rotationally connected to the bottom of the center disc, a plurality of limiting protrusions are uniformly fixedly arranged on the inner wall of the adjusting disc, a plurality of inclined grooves are uniformly formed in the inner wall of the adjusting disc, and the limiting protrusions and the inclined grooves are staggered, and the inclined grooves and the limiting protrusions cooperate with the traction seats.

[0008] Preferably, the positioning assembly further comprises a spherical traction block, the spherical traction block is fixedly connected to the side surface of the traction seat, and the spherical surface end of the spherical traction block abuts against the surface of the inclined groove.

[0009] Preferably, the positioning assembly further comprises a fixed rod, a movable rod and a spring, the fixed rod is fixedly connected to the side surface of the center disc, one end of the movable rod is axially slidably connected to the inside of the fixed rod, the other end of the movable rod is fixedly connected to the traction seat, and the spring is fixedly connected between the fixed rod and the traction seat and is sleeved on the surface of the movable rod.

[0010] Preferably, the positioning assembly further comprises a stop block, the stop block is fixedly connected to the traction seat, the stop block is located at one end of the traction seat, and the side of the stop block close to the split pump valve shaft seal is provided as an inclined surface.

[0011] Preferably, the driving assembly comprises a worm gear and a worm, the worm is arranged on the base, the worm gear is coaxially fixedly connected to the bottom of the center disc, and the worm gear is matched with the worm.

[0012] Preferably, the sliding assembly comprises a rotating shaft, a first hinged rod, a second hinged rod and a movable seat, the movable seat is horizontally slidably connected to the base, the rotating shaft is rotatably connected to the base, the worm is fixedly arranged on the rotating shaft, one end of the first hinged rod is fixedly connected to the rotating shaft, the other end of the first hinged rod is hingedly connected to one end of the second hinged rod, the other end of the second hinged rod is hingedly connected to the movable seat, and the polishing assembly is arranged on the top of the movable seat.

[0013] Preferably, the sliding assembly further comprises a limiting rod, and at least one limiting rod is fixedly connected to the base.

[0014] Preferably, the polishing assembly comprises a traction arm, a motor and a polishing piece, the traction arm is vertically slidably connected to the movable seat, the motor is fixedly connected to the traction arm, and the polishing piece is fixedly connected to the output end of the motor.

[0015] Preferably, the polishing assembly further comprises a guide rod and an electric push rod, the electric push rod and the guide rod are both vertically fixedly connected to the movable seat, the output end of the electric push rod is fixedly connected to the traction arm, and the traction arm is axially slidably connected to the guide rod.

[0016] The technical effects and advantages of the present application are as follows: The present application places the split pump valve shaft seal on the plurality of traction seats, drives the plurality of traction seats to move horizontally through the locking structure, clamps and positions the split pump valve shaft seal along different radial directions through the positioning blocks on the top of the traction seats, can realize accurate positioning of the split pump valve shaft seal due to the fact that the locking structure can control the plurality of traction seats at the same time, and can gradually drive the polishing assembly to approach the split pump valve shaft seal when positioning the split pump valve shaft seal through the arrangement of the driving assembly and the sliding assembly, so that the polishing assembly is away from the hands of the workers when the split pump valve shaft seal is placed, so as to prevent the hands of the workers from being injured.

[0017] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and achieved by the structures indicated in the specification and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic view of the main structure of the present application. Figure 2 Positioning diagram of split pump valve shaft seal of the present application; Figure 3 Main structure diagram of positioning assembly of the present application; Figure 4 Connection structure diagram of traction seat and center disc of the present application; Figure 5 Main structure diagram of driving assembly of the present application; Figure 6 Main structure diagram of locking structure of the present application; Figure 7 Main structure diagram of sliding assembly of the present application.

[0019] In the figure: 1, base; 2, split pump valve shaft seal; 3, polishing assembly; 31, traction arm; 32, guide rod; 33, electric push rod; 34, motor; 35, polishing piece; 4, positioning assembly; 41, positioning block; 42, locking structure; 421, adjusting disc; 422, limiting protrusion; 423, inclined groove; 43, center disc; 44, traction seat; 45, fixed rod; 46, stop block; 47, spherical traction block; 48, movable rod; 49, spring; 5, driving assembly; 51, worm gear; 52, worm; 6, sliding assembly; 61, rotating shaft; 62, first hinged rod; 63, second hinged rod; 64, movable seat; 65, limiting rod. DETAILED DESCRIPTION

[0020] The subject matter described herein will now be discussed with reference to example implementations. It should be understood that discussions of these implementations are intended to serve solely illustration of the subject matter described herein and should not necessarily be taken as limiting the aspects and scopes of the present disclosure. Variations to the functions and arrangements of the elements discussed can be made without departing from the scope of the content as protected by the present disclosure. Various examples can omit, substitute, or add various procedures or components as appropriate. Also, features described with respect to some examples can be combined in other examples.

[0021] As Figures 1 to 7As shown, the present application provides a split pump valve shaft seal processing tool, which comprises a base 1, the base 1 is provided with a polishing assembly 3 and a positioning assembly 4, which is used for positioning and polishing the end face of the split pump valve shaft seal 2, the positioning assembly 4 comprises a positioning block 41, a center disc 43 and a traction seat 44, the positioning block 41 is fixedly connected on the traction seat 44, the center disc 43 is fixedly connected on the base 1, the three traction seats 44 are evenly distributed and horizontally slidably connected on the center disc 43, the split pump valve shaft seal 2 is placed on the plurality of traction seats 44 and coaxially located above the center disc 43, the side surface of the plurality of positioning blocks 41 abuts against the side surface of the split pump valve shaft seal 2, the positioning assembly 4 further comprises a locking structure 42, the locking structure 42 is arranged on the center disc 43 and simultaneously cooperates with the plurality of traction seats 44, so as to drive the plurality of traction seats 44 to simultaneously elastically move along the radial direction of the center disc 43, thereby positioning the split pump valve shaft seal 2 through the plurality of positioning blocks 41, the base 1 is further provided with a driving assembly 5 and a sliding assembly 6, the driving assembly 5 is connected with the locking structure 42, the polishing assembly 3 is connected with the driving assembly 5 through the sliding assembly 6, the driving assembly 5 is used for driving the locking structure 42 to act to realize the positioning of the split pump valve shaft seal 2, and when the driving assembly 5 acts, the polishing assembly 3 is also driven by the sliding assembly 6 to approach the split pump valve shaft seal 2 to polish the end face thereof.

[0022] Please refer to Figures 1 to 2 When the driving assembly 5 is started, firstly, the locking structure 42 is acted on, the plurality of traction seats 44 are driven to synchronously and evenly contract in the radial direction of the center, so that the split pump valve shaft seal 2 placed thereon is accurately centered and clamped through the positioning block 41, when the clamping action is completed, the driving assembly 5 continues to act, the polishing assembly 3 is pushed by the sliding assembly 6 to stably move to the split pump valve shaft seal 2 which has been fixed to start the end face polishing work.

[0023] The locking structure 42 comprises an adjusting disc 421, a limiting protrusion 422 and an inclined groove 423, the adjusting disc 421 is coaxially and rotatably connected at the bottom of the center disc 43, the plurality of limiting protrusions 422 are evenly and fixedly arranged on the inner wall of the adjusting disc 421, the plurality of inclined grooves 423 are evenly arranged on the inner wall of the adjusting disc 421, and the limiting protrusions 422 and the inclined grooves 423 are staggered, the inclined grooves 423 and the limiting protrusions 422 are matched with the traction seats 44.

[0024] Please refer to Figure 6When the adjusting disc 421 is driven to rotate by the driving assembly 5, the components fixed on the traction seat 44 move on the inclined surface of the inclined groove 423. Since the inclined groove 423 is inclined relative to the center of the adjusting disc 421, the rotating movement is converted into the driving of the radial movement of the traction seat 44. The limiting protrusions 422 are staggered with the inclined groove 423, and play a limiting and stabilizing role between two movement periods. The limiting protrusions 422 provide the maximum range of the movement of the traction seat 44 on the inclined groove 423, so that the traction seat 44 cannot exceed this range.

[0025] The positioning assembly 4 further comprises a spherical traction block 47 fixedly connected to the side surface of the traction seat 44. The spherical surface end of the spherical traction block 47 abuts against the surface of the inclined groove 423.

[0026] Please refer to Figure 3 and Figure 4 When the adjusting disc 421 rotates, the wall surface of the inclined groove 423 slides relative to the spherical traction block 47, thereby pushing the spherical traction block 47 to move radially along the center disc 43, so as to drive the traction seat 44 to move through the spherical traction block 47. The spherical design at one end of the spherical traction block 47 optimizes the contact mode from possible sliding friction to point contact or approximate point contact, greatly reduces the friction resistance, and makes the movement smoother.

[0027] The positioning assembly 4 further comprises a fixed rod 45, a movable rod 48 and a spring 49. The fixed rod 45 is fixedly connected to the side surface of the center disc 43. One end of the movable rod 48 is axially and slidingly connected to the inside of the fixed rod 45. The other end of the movable rod 48 is fixedly connected to the traction seat 44. The spring 49 is fixedly connected between the fixed rod 45 and the traction seat 44 and is sleeved on the surface of the movable rod 48.

[0028] Please refer to Figure 3 and Figure 4 When the adjusting disc 421 drives the traction seat 44 to move to the center of the center disc 43 through the cooperation of the inclined groove 423 and the spherical traction block 47 to clamp the split pump valve shaft seal 2, the spring 49 is compressed to store energy. When it is needed to release the split pump valve shaft seal 2, the locking structure 42 releases the constraint on the traction seat 44. The compressed spring 49 releases energy to push the traction seat 44 to slide radially outward along the guide mechanism formed by the movable rod 48 and the fixed rod 45, and automatically resets to the open state.

[0029] The positioning assembly 4 further comprises a stop block 46 fixedly connected to the traction seat 44. The stop block 46 is located at one end of the traction seat 44, and the side of the stop block 46 close to the split pump valve shaft seal 2 is provided as an inclined surface.

[0030] Please refer to Figure 4When the operator initially places the split pump valve shaft seal 2 on the plurality of traction seats 44, the lower end of the split pump valve shaft seal 2 will first contact the inclined surfaces of the plurality of inclined blocks 46, and under the action of gravity, the split pump valve shaft seal 2 will automatically slide along the inclined surfaces and sit on the central support surface formed by the plurality of blocks 46, achieving the initial axial positioning and radial alignment of the split pump valve shaft seal 2.

[0031] The drive assembly 5 includes a worm gear 51 and a worm 52, the worm 52 is arranged on the base 1, and the worm gear 51 is coaxially fixedly connected to the bottom of the center disc 43. The worm gear 51 cooperates with the worm 52.

[0032] Please refer to Figure 5 , after the operator rotates the worm 52, the worm gear 51 engaged with the worm 52 is rotated, the rotation of the worm gear 51 directly drives the adjustment disc 421 to rotate, and then the adjustment disc 421 drives the traction seat 44 and the positioning block 41 to move through the cooperation of the inclined groove 423 and the spherical traction block 47, so as to realize the positioning of the plurality of positioning blocks 41 to the split pump valve shaft seal 2. During the grinding process of the split pump valve shaft seal 2, no matter how large the cutting force acting on the split pump valve shaft seal 2 is, the split pump valve shaft seal 2 cannot drive the worm gear 51 and the worm 52 in the opposite direction, thereby ensuring that the clamping state of the split pump valve shaft seal 2 will not be accidentally loosened.

[0033] The sliding assembly 6 includes a rotating shaft 61, a first hinged rod 62, a second hinged rod 63, and a movable seat 64. The movable seat 64 is horizontally slidably connected to the base 1, the rotating shaft 61 is rotatably connected to the base 1, the worm 52 is fixedly installed on the rotating shaft 61, one end of the first hinged rod 62 is fixedly connected to the rotating shaft 61, the other end of the first hinged rod 62 is hinged to one end of the second hinged rod 63, the other end of the second hinged rod 63 is hinged to the movable seat 64, and the grinding assembly 3 is arranged on the top of the movable seat 64.

[0034] Please refer to Figure 7 When the operator drives the worm 52 to rotate, the rotating shaft 61 rotates synchronously, driving the first hinged rod 62 fixedly connected thereto to swing, the first hinged rod 62 pushes the second hinged rod 63 through the hinge point, and the second hinged rod 63 pushes the movable seat 64 to slide horizontally on the base 1, thereby realizing the advance and retreat of the grinding assembly 3. Before the operator places the split pump valve shaft seal 2 on the plurality of traction seats 44, the grinding assembly 3 is away from the center disc 43 as a whole, at this time the operator can safely place the split pump valve shaft seal 2 on the plurality of traction seats 44, at this time after rotating the worm 52, the plurality of positioning blocks 41 can drive the grinding assembly 3 to approach the split pump valve shaft seal 2 through the sliding assembly 6 while positioning the split pump valve shaft seal 2, so as to facilitate the grinding of the end face of the split pump valve shaft seal 2.

[0035] The sliding assembly 6 further comprises limiting rods 65, two limiting rods 65 are fixedly connected to the base 1, and the movable seat 64 is axially and slidably connected to the movable seat 64.

[0036] Please refer to Figure 7 When the sliding assembly 6 pushes the movable seat 64, the limiting rods 65 provide accurate linear motion guide for the movable seat 64, and limit the movable seat 64 to move only in the direction parallel to the axis of the limiting rods 65, so as to prevent the movable seat 64 from deviating or being stuck.

[0037] The polishing assembly 3 comprises a traction arm 31, a motor 34 and a polishing piece 35, the traction arm 31 is vertically and slidably connected to the movable seat 64, the motor 34 is fixedly connected to the traction arm 31, and the polishing piece 35 is fixedly connected to the output end of the motor 34, the polishing assembly 3 further comprises a guide rod 32 and an electric push rod 33, the electric push rod 33 and the guide rod 32 are both vertically and fixedly connected to the movable seat 64, the output end of the electric push rod 33 is fixedly connected to the traction arm 31, and the traction arm 31 is axially and slidably connected to the guide rod 32.

[0038] Please refer to Figure 7 When the motor 34 is started, the motor 34 drives the polishing piece 35 to rotate at a high speed, so as to generate grinding capacity, by controlling the vertical position of the traction arm 31, the height of the polishing piece 35 can be adjusted, so that the polishing piece 35 is aligned with the end face of the split pump valve shaft seal 2, the electric push rod 33 serves as a power source to accurately control the lifting of the traction arm 31, and the guide rod 32 serves as a guide to ensure that the lifting process of the polishing piece 35 is stable and without shaking.

[0039] The above describes the embodiments of the present application, but the present application is not limited to the above specific embodiments, the above specific embodiments are only illustrative but not restrictive, and those skilled in the art can make many forms under the inspiration of the present application, which all belong to the protection of the present application.

Claims

1. A tool for processing split pump valve shaft seal, comprising a base (1), a polishing assembly (3) and a positioning assembly (4) are arranged on the base (1), and the polishing assembly (3) and the positioning assembly (4) are used for positioning and polishing the end face of the split pump valve shaft seal (2), characterized in that, The positioning assembly (4) comprises positioning blocks (41), a center disc (43) and traction seats (44), the positioning blocks (41) are fixedly connected to the traction seats (44), the center disc (43) is fixedly connected to the base (1), at least three traction seats (44) are uniformly distributed and horizontally slidably connected to the center disc (43), the split pump valve shaft seal (2) is placed on the plurality of traction seats (44) and coaxially located above the center disc (43), and the side surfaces of the plurality of positioning blocks (41) abut against the side surface of the split pump valve shaft seal (2). The positioning assembly (4) further comprises a locking structure (42), the locking structure (42) is arranged on the center disc (43) and simultaneously cooperates with the plurality of traction seats (44), so as to drive the plurality of traction seats (44) to simultaneously elastically move along the radial direction of the center disc (43), thereby positioning the split pump valve shaft seal (2) through the plurality of positioning blocks (41). The base (1) is further provided with a driving assembly (5) and a sliding assembly (6), the driving assembly (5) is connected with the locking structure (42), and the polishing assembly (3) is connected with the driving assembly (5) through the sliding assembly (6).

2. A split pump shaft seal machining tool according to claim 1, wherein, The locking structure (42) comprises an adjusting disc (421), limiting protrusions (422) and inclined grooves (423), the adjusting disc (421) is coaxially and rotationally connected to the bottom of the center disc (43), the plurality of limiting protrusions (422) are uniformly and fixedly arranged on the inner wall of the adjusting disc (421), the plurality of inclined grooves (423) are uniformly formed in the inner wall of the adjusting disc (421), and the limiting protrusions (422) and the inclined grooves (423) are staggered, and the inclined grooves (423) and the limiting protrusions (422) are matched with the traction seats (44).

3. A split pump shaft seal machining tool according to claim 2, wherein, The positioning assembly (4) further comprises spherical traction blocks (47), the spherical traction blocks (47) are fixedly connected to the side surfaces of the traction seats (44), and the spherical surfaces of the spherical traction blocks (47) abut against the surfaces of the inclined grooves (423).

4. A split pump shaft seal machining tool according to claim 3, wherein, The positioning assembly (4) further comprises a fixed rod (45), a movable rod (48) and a spring (49), the fixed rod (45) is fixedly connected to the side surface of the center disc (43), one end of the movable rod (48) is axially and slidably connected to the inside of the fixed rod (45), the other end of the movable rod (48) is fixedly connected to the traction seat (44), and the spring (49) is fixedly connected between the fixed rod (45) and the traction seat (44) and is sleeved on the surface of the movable rod (48).

5. A split pump shaft seal machining tool according to claim 1, wherein, The positioning assembly (4) further comprises a stop block (46), the stop block (46) is fixedly connected to the traction seat (44), the stop block (46) is located at one end of the traction seat (44), and the side of the stop block (46) close to the split pump valve shaft seal (2) is arranged as an inclined surface.

6. A split pump shaft seal machining tool according to claim 1, wherein, The driving assembly (5) comprises a worm gear (51) and a worm (52), the worm (52) is arranged on the base (1), the worm gear (51) is coaxially and fixedly connected to the bottom of the center disc (43), and the worm gear (51) is matched with the worm (52).

7. A split pump shaft seal machining tool according to claim 6, wherein, The sliding assembly (6) comprises a rotating shaft (61), a first hinged rod (62), a second hinged rod (63) and a movable seat (64), the movable seat (64) is horizontally and slidingly connected to the base (1), the rotating shaft (61) is rotatably connected to the base (1), the worm (52) is fixedly installed on the rotating shaft (61), one end of the first hinged rod (62) is fixedly connected to the rotating shaft (61), the other end of the first hinged rod (62) is hinged to one end of the second hinged rod (63), the other end of the second hinged rod (63) is hinged to the movable seat (64), and the polishing assembly (3) is arranged on the top of the movable seat (64).

8. A split pump shaft seal machining tool according to claim 7, wherein, The sliding assembly (6) further comprises a limiting rod (65), and at least one limiting rod (65) is fixedly connected to the base (1), and the movable seat (64) is slidingly connected to the movable seat (64) in the axial direction.

9. A split pump shaft seal machining tool according to claim 7, wherein, The polishing assembly (3) comprises a traction arm (31), a motor (34) and a polishing piece (35), the traction arm (31) is vertically and slidingly connected to the movable seat (64), the motor (34) is fixedly connected to the traction arm (31), and the polishing piece (35) is fixedly connected to the output end of the motor (34).

10. A split pump shaft seal machining tool according to claim 9, wherein, The polishing assembly (3) further comprises a guide rod (32) and an electric push rod (33), the electric push rod (33) and the guide rod (32) are both vertically and fixedly connected to the movable seat (64), the output end of the electric push rod (33) is fixedly connected to the traction arm (31), and the traction arm (31) is slidingly connected to the guide rod (32) in the axial direction.

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