Transportation tool for front axle split charging

Abstract

The utility model discloses a transportation tool for split charging of a front axle, which belongs to the field of axle support and comprises a flat plate support portion and a protruding support portion which are mounted on an automatic guided vehicle, a lifting limit seat is arranged between the flat plate support portion and the protruding support portion, and the lifting limit seat is transversely and slidably connected with the upper surface of the automatic guided vehicle. The flat plate supporting part comprises a left flat plate supporting seat and a right flat plate supporting seat which are arranged on one side of the upper surface of the automatic guide vehicle, and the protruding supporting part comprises a left V-groove supporting seat and a right V-groove supporting seat which are arranged on the other side of the upper surface of the automatic guide vehicle. The left V-groove supporting base, the right V-groove supporting base, the left flat plate supporting base and the right flat plate supporting base are all in longitudinal sliding connection with the upper surface of the automatic guiding vehicle. By arranging the adjustable flat plate supporting part, the protruding supporting part and the lifting limiting seat, the adaptability of the tool to different types of front axles is remarkably improved, rapid and accurate positioning is ensured, and the production efficiency and flexibility are greatly improved.

Description

Technical Field

[0001] The utility model belongs to the field of axle supports, and in particular relates to a transport tooling for front axle subassembly. Background Art

[0002] In the automobile manufacturing industry, the front axle is a key component of the vehicle chassis, and its subassembly process is crucial to the assembly quality and production efficiency of the whole vehicle. Traditional front axle subassembly processes mostly rely on manual operation or fixed tooling, which has problems such as low efficiency, poor flexibility, and insufficient adaptability to different vehicle models. Specifically, fixed tooling can often only be designed for a specific model, and it is difficult to quickly adjust to meet the needs of mixed-line production of multiple models, which limits the flexibility and efficiency of the production line. In addition, manual handling of front axle components is not only labor-intensive, but also prone to component damage, affecting product quality.

[0003] With the development of automation and intelligent technology, the application of automatic guided vehicles (AGV) in the field of automobile manufacturing is becoming more and more extensive. They can autonomously navigate inside the factory and realize the efficient transportation of materials. For example, the utility model patent with the publication number CN220738843U provides an AGV flexible tooling, including: an AGV trolley, on which a support frame is connected, and the support frame includes a lower support frame and an upper support frame, wherein a working platform is arranged on the upper support frame, and a guide component is arranged between the upper support frame and the lower support frame; a positioning bracket, located in the laser ED removal equipment, and a walking channel is arranged on the positioning bracket, wherein an adjustment platform is arranged on the positioning bracket, and an adjustment component is arranged on the adjustment platform.

[0004] However, the technology disclosed in this patent still has a limited adjustment range for adapting to workpieces, and cannot adapt well to special components such as front axles. There are still many challenges in safely and stably loading complex and heavy components such as front axles on AGVs. There is an urgent need for a tooling structure that can be flexibly adjusted to adapt to various models of front axles.

[0005] In view of this, this application is hereby filed. Utility Model Content

[0006] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a transport tool for front axle subassembly. The utility model is achieved through the following technical solutions:

[0007] A transport tooling for front axle subpackaging comprises a flat plate support portion and a protruding support portion installed on an automatic guided vehicle, a lifting limit seat is arranged between the flat plate support portion and the protruding support portion, the lifting limit seat is laterally slidably connected to the upper surface of the automatic guided vehicle, the flat plate support portion comprises a left flat plate support seat and a right flat plate support seat arranged on one side of the upper surface of the automatic guided vehicle, the protruding support portion comprises a left V-groove support seat and a right V-groove support seat arranged on the other side of the upper surface of the automatic guided vehicle, and the left V-groove support seat, the right V-groove support seat, the left flat plate support seat and the right flat plate support seat are all longitudinally slidably connected to the upper surface of the automatic guided vehicle.

[0008] Preferably, a positioning module for locking the position is provided between the lifting limit seat, the left V-groove support seat, the right V-groove support seat and the automatic guided vehicle.

[0009] Preferably, the left V-groove support seat and the right V-groove support seat both include a mounting base fixedly mounted on an automatic guided vehicle, a first guide rail, a first limit block and a second limit block are mounted on the mounting base, the first limit block and the second limit block are arranged at both ends of the first guide rail, a leaf spring support seat is slidably arranged on the first guide rail, a V-shaped groove is arranged in the leaf spring support seat, and a buffer and wear-resistant pad is arranged on the inner wall of the V-shaped groove.

[0010] Preferably, the leaf spring support seat is installed on a first sliding connection plate, a sliding block is provided at the bottom of the first sliding connection plate, and the first sliding connection plate is connected to the first guide rail via the sliding block.

[0011] Preferably, the positioning module is an elastic positioning tooth pin module, and the elastic positioning tooth pin module comprises a first lower rack, a fixed flange seat, a central axis, a hand-tightening knob, an upper rack, a shoulder hinge pin and a spring;

[0012] The first lower rack is installed on the side of the first guide rail, the fixed flange seat is fixedly installed on the first sliding connecting plate, the central shaft is slidably arranged in the fixed flange seat, the upper and lower ends of the central shaft are respectively fixed with a hand-tightened knob and an upper rack, the spring is installed between the fixed flange seat and the upper rack, a notch is provided on the top of the fixed flange seat, and the shoulder hinge pin radially passes through the central shaft for fixed installation and then overlaps in the notch.

[0013] Preferably, the left flat panel support seat and the right flat panel support seat both include a guide rail base fixedly mounted on an automatic guided vehicle, and sliding support plates parallel to each other are longitudinally arranged on the guide rail base, a slideway is formed between the two sliding support plates, a first hard limit and a second hard limit are respectively installed at both ends of the slideway, a support frame is slidably arranged in the slideway, and a positioning portion for locking the position is provided between the support frame and the slideway.

[0014] Preferably, a support base is installed at the bottom of the support frame, and the sliding support plate extends upward from the surface of the guide rail base beyond the support base and then extends toward the slideway direction to form an L-shaped structure, thereby limiting the support base in the vertical direction.

[0015] Preferably, the positioning portion includes a plurality of positioning holes arranged at the bottom of the slideway along the sliding direction of the support frame, and a plunger screw is installed at the bottom of the support frame, and the plunger screw cooperates with the positioning hole to achieve locking.

[0016] Preferably, the lifting limit seat includes a bottom support fixedly mounted on the automatic guided vehicle, the bottom support is I-shaped, a second guide rail is installed on the middle section of the I-shape of the bottom support, a third limit block and a fourth limit block are arranged at both ends of the second guide rail, a second sliding connecting plate is slidably arranged on the second guide rail, a latch plate bracket is detachably mounted on the second sliding connecting plate through a height adjustment component, and at least two U-shaped bolts are arranged on the latch plate bracket.

[0017] Preferably, the height adjustment component includes an inner sleeve and an outer sleeve which are socketed with each other, the upper end of the inner sleeve is fixed to the bottom of the latch plate bracket, the outer sleeve is fixed to the second sliding connecting plate, and a transversely arranged U-shaped through groove is opened on the outer sleeve, and the ends of the two side arms of the U-shaped through groove are bent vertically downward and extended, and a height fixing bolt is fixedly installed on the outer cylindrical surface of the inner sleeve, and the height fixing bolt is slidably arranged in the U-shaped through groove.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. By integrating adjustable flat support parts and protruding support parts on the automatic guided vehicle, as well as the lifting limit seat design, the adaptability of the tooling to different front axle models is significantly improved. Through the horizontal and vertical sliding connection, fast and accurate positioning is ensured, which greatly improves production efficiency and flexibility, while ensuring the stability and safety of the transportation process and reducing the potential risk of component damage.

[0020] 2. By adding positioning modules, the stability of the tooling on the automatic guided vehicle is further enhanced, effectively avoiding the displacement of the supporting parts caused by movement or vibration, and ensuring the precise positioning of the front axle subassembly.

[0021] 3. By adopting a V-groove structure for the left and right V-groove support seats, the leaf spring connector falls into the V-groove, and no other limiting structures are required, which can also ensure the stability of the axle during transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the leaf spring V-groove support seat of the utility model;

[0024] Figure 3 It is a structural schematic diagram of the elastic positioning tooth pin module of the utility model;

[0025] Figure 4 This is a three-dimensional cross-sectional view of the elastic positioning tooth pin module of the utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the leaf spring flat support seat of the utility model;

[0027] Figure 6 It is a structural schematic diagram of the lifting limit seat of the utility model;

[0028] Figure 7 It is a structural schematic diagram of the latch plate bracket of the utility model;

[0029] Figure 8 It is a structural schematic diagram of the outer sleeve of the utility model.

[0030] In the figure: 1. Left V-groove support seat; 2. Right V-groove support seat; 3. Left flat plate support seat; 4. Right flat plate support seat; 5. Lifting limit seat; 6. Automatic guided vehicle; 10. Mounting base; 11. First guide rail; 12. Leaf spring support seat; 13. First lower rack; 14. First limit block; 15. Handle; 16. Buffer wear pad; 17. Second limit block; 20. Elastic positioning tooth pin module; 21. Hand-tightening knob; 22. First sliding connecting plate; 23. Sliding block; 24. Upper rack; 25. Shoulder hinge pin; 26. Elastic Spring; 27, fixed flange seat; 31, guide rail base; 32, support frame; 33, buffer pad; 34, first hard limit; 35, second hard limit; 36, plunger screw; 40, bottom support; 41, second guide rail; 42, second lower rack; 43, third limit block; 44, nut; 45, first U-shaped bolt; 46, second U-shaped bolt; 47, height fixing bolt; 48, latch plate bracket; 49, outer sleeve 53; 50, fourth limit block; 51, second sliding connecting plate; 52, inner sleeve; 53, outer sleeve. DETAILED DESCRIPTION

[0031] The utility model is further described below in conjunction with the accompanying drawings.

[0032] Embodiment 1

[0033] like Figure 1 – Figure 8As shown, this embodiment provides a transport tooling for front axle subpackaging, including a flat plate support portion and a protruding support portion installed on an automatic guided vehicle, a lifting limit seat is arranged between the flat plate support portion and the protruding support portion, and the lifting limit seat is laterally slidably connected to the upper surface of the automatic guided vehicle 6, the flat plate support portion includes a left flat plate support seat 3 and a right flat plate support seat 4 arranged on one side of the upper surface of the automatic guided vehicle 6, and the protruding support portion includes a left V-groove support seat 1 and a right V-groove support seat 2 arranged on the other side of the upper surface of the automatic guided vehicle 6, and the left V-groove support seat 1, the right V-groove support seat 2, the left flat plate support seat 3 and the right flat plate support seat 4 are all longitudinally slidably connected to the upper surface of the automatic guided vehicle 6.

[0034] Specifically, two V-groove support seats and two flat plate support seats respectively support the two ends of the leaf spring, and the lifting limit seat is used to limit the bridge shaft on the leaf spring to prevent the bridge shaft from slipping during operation and causing safety accidents.

[0035] By integrating adjustable flat support parts and protruding support parts on the automatic guided vehicle, as well as the lifting limit seat design, the adaptability of the tooling to different front axle models is significantly improved. Through the horizontal and vertical sliding connection, fast and accurate positioning is ensured, which greatly improves production efficiency and flexibility, while ensuring the stability and safety of the transportation process and reducing the potential risk of component damage.

[0036] Positioning modules for locking positions are provided between the lifting limit seat 5, the left V-groove support seat 1, the right V-groove support seat 2 and the automatic guided vehicle 6. By adding positioning modules, the stability of the tooling on the automatic guided vehicle is further enhanced, the displacement of the supporting parts caused by movement or vibration is effectively avoided, and the accurate positioning of the front axle subassembly is ensured.

[0037] The left V-groove support seat 1 and the right V-groove support seat 2 both include a mounting base 10 fixedly mounted on the automatic guided vehicle 6, on which a first guide rail 11, a first limit block 14 and a second limit block 17 are mounted, the first limit block 14 and the second limit block 17 are arranged at both ends of the first guide rail 11, a leaf spring support seat 12 is slidably arranged on the first guide rail 11, a V-shaped groove is arranged in the leaf spring support seat 12, and a buffer wear-resistant pad 16 is arranged on the inner wall of the V-shaped groove to protect the material and prevent the material from being worn during operation.

[0038] By adopting a V-groove structure for the left and right V-groove support seats, the leaf spring connector falls into the V-groove, and no other limiting structures are required, and the stability of the axle during transportation can be ensured.

[0039] Furthermore, a handle 15 is fixed to the side of the leaf spring support seat 12 for easy holding and adjustment.

[0040] The leaf spring support seat 12 is installed on a first sliding connection plate 22 . A sliding block 23 is provided at the bottom of the first sliding connection plate 22 . The first sliding connection plate 22 is connected to the first guide rail 11 via the sliding block 23 .

[0041] The positioning module is an elastic positioning gear pin module 20, which includes a first lower rack 13, a fixed flange seat 27, a central axis, a hand-tightening knob 21, an upper rack 24, a shoulder hinge pin 25 and a spring 26. The first lower rack 13 is installed on the side of the first guide rail 11, and the fixed flange seat 27 is fixedly installed on the first sliding connecting plate 22. The central axis is slidably arranged in the fixed flange seat 27, and the upper and lower ends of the central axis are respectively fixed with a hand-tightening knob 21 and an upper rack 24. The spring 26 is installed between the fixed flange seat 27 and the upper rack 24. A notch is opened on the top of the fixed flange seat 27, and the shoulder hinge pin 25 radially passes through the central axis to achieve fixed installation and then overlaps in the notch.

[0042] Preferably, a ruler (not shown in the figure) is provided on the side of the first lower rack 13. Through manual operation, the spring 26 presses the first lower rack 13 to adjust the position, and then compares it with the ruler to achieve precise positioning. The operation is simple, convenient and reliable for workers, and the positioning accuracy is high.

[0043] First, manually pull up the hand knob 21 to separate the upper rack 24 from the first lower rack 13, and after rotation, the shoulder hinge pin 25 can overlap the notch on the fixed flange seat 27. Then, after the leaf spring support seat 12 is adjusted to the right position, the hand knob 21 is released, and the upper rack 24 is tightly meshed with the first lower rack 13 by the elastic force of the spring 26, so that the leaf spring support seat 12 is stably positioned.

[0044] Embodiment 2

[0045] like Figure 2 – Figure 5 As shown, in this embodiment, based on the first embodiment, the left flat panel support seat 3 and the right flat panel support seat 4 both include a guide rail base 31 fixedly mounted on the automatic guided vehicle 6, and sliding support plates parallel to each other are longitudinally arranged on the guide rail base 31, and a slideway is formed between the two sliding support plates, and a first hard limit 34 and a second hard limit 35 are respectively installed at both ends of the slideway, a support frame 32 is slidably arranged in the slideway, and a positioning portion for locking the position is provided between the support frame 32 and the slideway.

[0046] A support base is installed at the bottom of the support frame 32. The sliding support plate extends upward from the surface of the guide rail base beyond the support base and then extends toward the slideway to form an L-shaped structure, thereby limiting the support base in the vertical direction.

[0047] Furthermore, the top of the support frame 32 is a planar support portion, and a buffer pad 33 is installed on the planar support portion, which effectively improves the vertical support force on the bottom of the front axle, while reducing the impact during transportation, protecting the surface of the front axle, improving the overall vibration resistance, and ensuring the integrity of the product.

[0048] The positioning portion includes a plurality of positioning holes arranged at the bottom of the slideway along the sliding direction of the support frame 32 . A plunger screw 36 is installed at the bottom of the support frame 32 . The plunger screw 36 cooperates with the positioning holes to achieve locking.

[0049] Embodiment 3

[0050] like Figure 6 – Figure 8 As shown, in this embodiment, based on the first embodiment, the lifting limit seat 5 includes a bottom support 40 fixedly mounted on the automatic guided vehicle 6, the bottom support 40 is I-shaped, a second guide rail 41 is installed in the middle section of the I-shape of the bottom support 40, a third limit block 43 and a fourth limit block 50 are arranged at both ends of the second guide rail 41, a second sliding connecting plate 51 is slidably arranged on the second guide rail 41, a latch plate bracket 48 is detachably mounted on the second sliding connecting plate 51 through a height adjustment component, and at least two U-shaped bolts are arranged on the latch plate bracket 48.

[0051] Furthermore, the latch plate bracket 48 is provided with a first U-shaped bolt 45 and a second U-shaped bolt 46, and the positions of the first U-shaped bolt 45 and the second U-shaped bolt 46 are limited by a nut 44. The front and rear directions of the bridge shaft are limited by the two U-shaped bolts. The first U-shaped bolt 45 and the second U-shaped bolt 46 each have two legs, and the two legs are mounted to the latch plate bracket 48 through a nut 44.

[0052] The position between the first U-shaped bolt 45 and the second U-shaped bolt 46 is adjustable, and the distance between the two legs of the first U-shaped bolt 45 and the second U-shaped bolt 46 is adjustable.

[0053] The height adjustment component includes an inner sleeve 52 and an outer sleeve 53 which are socketed with each other. The upper end of the inner sleeve 52 is fixed to the bottom of the latch plate bracket 48, and the outer sleeve 53 is fixed to the second sliding connecting plate 51. The outer sleeve 53 is provided with a transversely arranged U-shaped through groove, and the ends of the two side arms of the U-shaped through groove are bent vertically downward and extended. The outer cylindrical surface of the inner sleeve 52 is fixedly installed with a height fixing bolt 47, and the height fixing bolt 47 is slidably arranged in the U-shaped through groove.

[0054] The connection method adopts a sleeve form, and the height of the latch plate bracket 48 can be adjusted according to different bridge types. The height is positioned by the height-fixing bolt 47 acting as a pin. After the inner sleeve 52 is rotated a certain angle, the height can be adjusted. After adjustment, the pin can be rotated in the opposite direction to fall into the path groove acted as a U-shaped through groove processed on the wall of the outer sleeve 53 for limiting.

[0055] Furthermore, the second sliding connection plate 51 is also provided with a sliding block like the bottom of the first sliding connection plate 22 , and is slidably arranged on the second guide rail 41 through the sliding block.

[0056] Furthermore, an elastic positioning tooth pin module 20 is also arranged between the second sliding connecting plate 51 and the bottom support 40, and also includes a first lower rack 13, a fixed flange seat 27, a central axis, a hand-tightening knob 21, an upper rack 24, a shoulder hinge pin 25 and a spring 26. The first lower rack 13 is installed on the side of the second guide rail 41, and the fixed flange seat 27 is fixedly installed on the second sliding connecting plate 51. The central axis is slidably arranged in the fixed flange seat 27, and the hand-tightening knob 21 and the upper rack 24 are respectively fixed at the upper and lower ends of the central axis. The spring 26 is installed between the fixed flange seat 27 and the upper rack 24. A notch is opened on the top of the fixed flange seat 27, and the shoulder hinge pin 25 radially passes through the central axis to achieve fixed installation and then overlaps in the notch.

[0057] Preferably, a ruler (not shown in the figure) is provided on the side of the second lower rack 42. Through manual operation, the spring 26 presses the second lower rack 42 to adjust the position, and then compares it with the ruler to achieve precise positioning. The operation is simple, convenient and reliable for workers, and the positioning accuracy is high.

[0058] First, manually pull up the hand knob 21 to separate the upper rack 24 from the second lower rack 42, and after rotation, the shoulder hinge pin 25 can overlap the notch on the fixed flange seat 27. Then, after adjusting the lifting limit seat 5 to the right position, release the hand knob 21, and the upper rack 24 and the second lower rack 42 are tightly engaged by the elastic force of the spring 26, so that the lifting limit seat 5 is stably positioned.

Claims

1. A transport tool for front axle subpackaging, characterized by: The invention comprises a flat plate support part and a protruding support part installed on an automatic guided vehicle (6), a lifting limit seat is arranged between the flat plate support part and the protruding support part, and the lifting limit seat is connected to the upper surface of the automatic guided vehicle (6) in a transverse sliding manner. The flat plate support part comprises a left flat plate support seat (3) and a right flat plate support seat (4) arranged on one side of the upper surface of the automatic guided vehicle (6), and the protruding support part comprises a left V-groove support seat (1) and a right V-groove support seat (2) arranged on the other side of the upper surface of the automatic guided vehicle (6), and the left V-groove support seat (1), the right V-groove support seat (2), the left flat plate support seat (3) and the right flat plate support seat (4) are all connected to the upper surface of the automatic guided vehicle (6) in a longitudinal sliding manner.

2. The transport tooling for front axle subpackaging according to claim 1, characterized in that: Positioning modules for locking positions are arranged between the lifting limit seat (5), the left V-groove support seat (1), the right V-groove support seat (2) and the automatic guided vehicle (6).

3. The transport tooling for front axle subpackaging according to claim 2, characterized in that: The left V-groove support seat (1) and the right V-groove support seat (2) both comprise a mounting base (10) fixedly arranged on an automatic guided vehicle (6); a first guide rail (11), a first limit block (14) and a second limit block (17) are mounted on the mounting base (10); the first limit block (14) and the second limit block (17) are arranged at two ends of the first guide rail (11); a leaf spring support seat (12) is slidably arranged on the first guide rail (11); a V-shaped groove is arranged in the leaf spring support seat (12); and a buffer wear-resistant pad (16) is arranged on the inner wall of the V-shaped groove.

4. The transport tooling for front axle subpackaging according to claim 3, characterized in that: The leaf spring support seat (12) is mounted on a first sliding connection plate (22), a sliding block (23) is provided at the bottom of the first sliding connection plate (22), and the first sliding connection plate (22) is connected to the first guide rail (11) via the sliding block (23).

5. The transport tool for front axle subpackaging according to claim 4, characterized in that: The positioning module is an elastic positioning tooth pin module (20), and the elastic positioning tooth pin module (20) comprises a first lower rack (13), a fixed flange seat (27), a central axis, a hand-tightening knob (21), an upper rack (24), a shoulder hinge pin (25) and a spring (26); The first lower rack (13) is installed on the side of the first guide rail (11), the fixed flange seat (27) is fixedly installed on the first sliding connecting plate (22), the central axis is slidably arranged in the fixed flange seat (27), the upper and lower ends of the central axis are respectively fixed with a hand-tightened knob (21) and an upper rack (24), the spring (26) is installed between the fixed flange seat (27) and the upper rack (24), the top of the fixed flange seat (27) is provided with a notch, and the shoulder hinge pin (25) radially passes through the central axis to achieve fixed installation and then overlaps in the notch.

6. The transport tool for front axle subpackaging according to claim 1, characterized in that: The left flat plate support seat (3) and the right flat plate support seat (4) both comprise a guide rail base (31) fixedly arranged on the automatic guided vehicle (6), and sliding support plates parallel to each other are longitudinally arranged on the guide rail base (31), and a slideway is formed between the two sliding support plates, and a first hard limit (34) and a second hard limit (35) are respectively installed at both ends of the slideway, and a support frame (32) is slidably arranged in the slideway, and a positioning portion for locking the position is arranged between the support frame (32) and the slideway.

7. The transport tool for front axle subpackaging according to claim 6, characterized in that: A support base is installed at the bottom of the support frame (32), and the sliding support plate extends upward from the surface of the guide rail base beyond the support base and then extends toward the slideway to form an L-shaped structure, thereby limiting the support base in the vertical direction.

8. The transport tool for front axle subpackaging according to claim 6, characterized in that: The positioning portion comprises a plurality of positioning holes arranged at the bottom of the slideway along the sliding direction of the support frame (32); a plunger screw (36) is installed at the bottom of the support frame (32); the plunger screw (36) cooperates with the positioning hole to achieve locking.

9. The transport tool for front axle subpackaging according to claim 2, characterized in that: The lifting limit seat (5) comprises a bottom support (40) fixedly arranged on the automatic guided vehicle (6); the bottom support (40) is in an I-shape; a second guide rail (41) is installed in the middle section of the I-shape of the bottom support (40); a third limit block (43) and a fourth limit block (50) are arranged at both ends of the second guide rail (41); a second sliding connecting plate (51) is slidably arranged on the second guide rail (41); a latch plate bracket (48) is detachably mounted on the second sliding connecting plate (51) via a height adjustment component; and at least two U-shaped bolts are arranged on the latch plate bracket (48).

10. The transport tool for front axle subpackaging according to claim 9, characterized in that: The height adjustment component comprises an inner sleeve (52) and an outer sleeve (53) which are sleeved with each other, the upper end of the inner sleeve (52) is fixed to the bottom of the latch plate bracket (48), the outer sleeve (53) is fixed to the second sliding connecting plate (51), a U-shaped through groove arranged transversely is opened on the outer sleeve (53), the ends of the two side arms of the U-shaped through groove are bent and extended vertically downward, and a height fixing bolt (47) is fixedly installed on the outer cylindrical surface of the inner sleeve (52), and the height fixing bolt (47) is slidably arranged in the U-shaped through groove.

Images