Railway train air conditioner structure easy to disassemble, assemble and overhaul

Abstract

A railway train air conditioner structure easy to disassemble, assemble and overhaul belongs to the technical field of railway train air conditioners. The problem that an existing railway train air conditioner structure is inconvenient to disassemble, assemble and overhaul is solved. Comprising an air conditioner assembly fixing and supporting frame body, an air conditioner assembly mounting frame body and an air conditioner assembly, the air conditioner assembly is arranged in the air conditioner assembly mounting frame body, the air conditioner assembly mounting frame body is arranged in the air conditioner assembly fixing and supporting frame body, and the air conditioner assembly fixing and supporting frame body is installed on a railway train. Through the reasonable structural design, the air conditioner assembly mounting frame body can be conveniently and slidably disassembled and assembled in the air conditioner assembly fixing and supporting frame body, meanwhile, the access door is arranged so that internal parts can be conveniently overhauled, the limiting fixing piece can ensure the stability of the air conditioner assembly mounting frame body in the running process, and the service life of the air conditioner assembly mounting frame body is prolonged. The whole structure is easy to disassemble, assemble and overhaul, the overhaul efficiency is improved, the overhaul cost is reduced, and normal operation of the railway train is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of railway train air conditioning technology, and in particular relates to a railway train air conditioning structure that is easy to disassemble and maintain. Background Technology

[0002] During train operation, the air conditioning system is a crucial component for ensuring a comfortable environment inside the carriages. However, existing train air conditioning structures present numerous inconveniences in terms of disassembly, assembly, and maintenance. Traditional air conditioning installation methods are complex, leading to cumbersome disassembly and installation processes when maintenance or replacement of air conditioning components is needed. This consumes significant manpower and time, increases maintenance costs and train downtime, and impacts operational efficiency. Therefore, designing a train air conditioning structure that is easy to disassemble, assemble, and maintain is of significant practical importance. Utility Model Content

[0003] The purpose of this utility model is to provide a railway train air conditioning structure that is easy to disassemble, assemble, and maintain, in order to solve the problem of inconvenient disassembly, assembly, and maintenance of existing railway train air conditioning structures.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an air conditioning structure for railway trains that is easy to disassemble and maintain, comprising an air conditioning component fixing support frame, an air conditioning component mounting frame, and an air conditioning component. The air conditioning component is disposed in the air conditioning component mounting frame, the air conditioning component mounting frame is disposed in the air conditioning component fixing support frame, and the air conditioning component fixing support frame is installed on the railway train.

[0005] Furthermore, the air conditioning component fixing support frame includes a mounting plate and two L-shaped mounting plates. The two L-shaped mounting plates are respectively arranged on the lower end face of the mounting plate along the length direction of the mounting plate. Mounting holes are provided at the four corners of the mounting plate. The air conditioning component fixing support frame is installed on the railway train through the mounting holes. Sliding grooves are opened on the front and rear sides of the lower end face of the mounting plate along the length direction of the mounting plate. The two L-shaped mounting plates are arranged opposite each other and the horizontal plates of the two L-shaped mounting plates are located on the opposite inner side. The upper end face of the vertical plates of the two L-shaped mounting plates is provided with sliders along the length direction of the L-shaped mounting plate. The two sliders are slidably connected to the corresponding sliding grooves.

[0006] Furthermore, the upper ends of the outer side walls of the vertical plates of the two L-shaped mounting plates are respectively provided with L-shaped fixing plates along the length of the L-shaped mounting plates. The upper surface of the horizontal plate and the inner side of the vertical plate of the two L-shaped fixing plates are respectively fitted to the lower end and front and rear ends of the mounting plate and the front and rear ends of the mounting plate. The two L-shaped fixing plates are respectively fixedly connected to the mounting plate by multiple fixing bolts.

[0007] Furthermore, each of the two L-shaped fixing plates has an inspection door, the upper end of which is hinged to the L-shaped fixing plate, and the lower end of which is locked to the L-shaped fixing plate. The inspection door is equipped with a handle.

[0008] Furthermore, the air conditioning component mounting frame includes an upper sliding plate, a lower sliding plate, and multiple support columns. The lower end face of the mounting plate has two sliding grooves (II) along its length, one on each side. These two grooves are respectively located inside the corresponding first sliding groove. The upper end face of the upper sliding plate has two sliders (II) along its length, one on each side. These two sliders are slidably connected to their corresponding second sliding grooves. The upper surface of the horizontal plates of the two L-shaped mounting plates has three sliding grooves (III) along their length. The lower end face of the lower sliding plate has three sliders (III) along its length, one on each side. These two sliders are slidably connected to their corresponding third sliding grooves. Multiple support columns are located at the four corners of the upper and lower sliding plates and are vertically positioned between them. The air conditioning component is mounted on the upper surface of the lower sliding plate.

[0009] Furthermore, the slide plate has multiple heat dissipation slots.

[0010] Furthermore, both ends of the two L-shaped mounting plates are slidably provided with limiting fasteners, and both ends of the horizontal plates of the two L-shaped mounting plates are horizontally provided with limiting grooves, with the limiting fasteners slidably disposed in the corresponding limiting grooves.

[0011] Furthermore, the limiting and fixing component includes a limiting block, a push-pull column, and a second positioning bolt. The limiting block is slidably disposed in the corresponding limiting groove. The limiting block is provided with a push-pull column and a second positioning bolt. The position of the second positioning bolt corresponds to the position of the third sliding groove. In the non-limiting and fixing state, the limiting block is completely located in the limiting groove. In the limiting and fixing state, the limiting block partially slides out of the limiting groove, and the second positioning bolt on the limiting block is located at the end of the corresponding third sliding groove, for fixed connection with the end of the third slider in the third sliding groove.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This utility model, through its reasonable structural design, allows the air conditioning component mounting frame to be easily slidably assembled and disassembled within the air conditioning component fixed support frame. It also features an inspection door for easy access to internal components, and limiting fasteners ensure the stability of the air conditioning component mounting frame during operation. The overall structure is easy to assemble, disassemble, and maintain, improving maintenance efficiency, reducing maintenance costs, and ensuring the normal operation of railway trains. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model. Figure 1 ;

[0015] Figure 2This is a schematic diagram of the overall structure of this utility model. Figure 2 ;

[0016] Figure 3 This is a schematic diagram of the overall structure of this utility model. Figure 3 ;

[0017] Figure 4 This is a schematic diagram of the overall structure of this utility model. Figure 4 ;

[0018] Figure 5 This is a schematic diagram of the overall structure of this utility model. Figure 5 ;

[0019] Figure 6 yes Figure 5 Enlarged view of point A.

[0020] The component names and reference numerals in the above figures are as follows:

[0021] 1. Mounting plate; 2. Mounting hole; 3. L-shaped mounting plate; 4. Slide groove one; 5. Slide groove two; 6. Upper sliding plate; 7. Support column; 8. Lower sliding plate; 9. Air conditioning component; 10. Limiting fastener; 11. L-shaped fixing plate; 12. Fixing bolt one; 13. Inspection door; 14. Handle; 15. Heat dissipation groove; 16. Limiting groove; 17. Limiting block; 18. Push-pull column; 19. Positioning bolt two; 20. Slide groove three. Detailed Implementation

[0022] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0023] Detailed implementation methods: such as Figures 1-6 As shown, this embodiment discloses a railway train air conditioning structure that is easy to disassemble and maintain, including an air conditioning component fixing support frame, an air conditioning component mounting frame, and an air conditioning component 9. The air conditioning component 9 is installed in the air conditioning component mounting frame, the air conditioning component mounting frame is installed in the air conditioning component fixing support frame, and the air conditioning component fixing support frame is installed on the railway train.

[0024] Furthermore, the air conditioning component fixing support frame includes a mounting plate 1 and two L-shaped mounting plates 3. The two L-shaped mounting plates 3 are respectively arranged on the lower end face of the mounting plate 1 along the length direction of the mounting plate 1. Mounting holes 2 are respectively provided at the four corners of the mounting plate 1. The air conditioning component fixing support frame is installed on the railway train through the mounting holes 2. Sliding grooves 4 are respectively opened on the front and rear sides of the lower end face of the mounting plate 1 along the length direction of the mounting plate 1. The two L-shaped mounting plates 3 are arranged opposite each other and the horizontal plates of the two L-shaped mounting plates 3 are located on the opposite inner side. The upper end face of the vertical plates of the two L-shaped mounting plates 3 is respectively provided with sliders 1 along the length direction of the L-shaped mounting plate 3. The two sliders 1 are slidably connected to the corresponding sliding grooves 4.

[0025] Furthermore, the upper ends of the outer side walls of the vertical plates of the two L-shaped mounting plates 3 are respectively provided with L-shaped fixing plates 11 along the length direction of the L-shaped mounting plates 3. The upper surface of the horizontal plate and the inner side of the vertical plate of the two L-shaped fixing plates 11 are respectively attached to the lower end face and the front and rear ends face of the mounting plate 1 and the front and rear ends face of the mounting plate 1. The two L-shaped fixing plates 11 are respectively fixedly connected to the mounting plate 1 by multiple fixing bolts 12.

[0026] Furthermore, each of the two L-shaped fixing plates 11 has an inspection door 13. The upper end of the inspection door 13 is hinged to the L-shaped fixing plate 11, and the lower end of the inspection door 13 is locked to the L-shaped fixing plate 11. The inspection door 13 is provided with a handle 14.

[0027] Furthermore, the air conditioning component mounting frame includes an upper sliding plate 6, a lower sliding plate 8, and multiple support columns 7. The lower end face of the mounting plate 1 has two sliding grooves 5 on both sides along the length of the mounting plate 1. The two sliding grooves 5 are respectively located inside the corresponding sliding groove 4. The upper end face of the upper sliding plate 6 has two sliders 2 on both sides along the length of the upper sliding plate 6. The two sliders 2 are slidably connected to the corresponding sliding grooves 2 5. The upper surface of the horizontal plate of the two L-shaped mounting plates 3 has three sliding grooves 20 on both sides along the length of the L-shaped mounting plate 3. The lower end face of the lower sliding plate 8 has three sliders 3 on both sides along the length of the lower sliding plate 8. The two sliders 3 are slidably connected to the corresponding sliding grooves 3 20. The multiple support columns 7 are located at the four corners of the upper sliding plate 6 and the lower sliding plate 8 and are vertically arranged between the upper sliding plate 6 and the lower sliding plate 8. The air conditioning component 9 is arranged on the upper surface of the lower sliding plate 8.

[0028] Furthermore, the lower slide plate 8 has multiple heat dissipation slots 15.

[0029] Furthermore, both ends of the two L-shaped mounting plates 3 are slidably provided with limiting fasteners 10, and both ends of the horizontal plates of the two L-shaped mounting plates 3 are horizontally provided with limiting grooves 16, and the limiting fasteners 10 are slidably provided in the corresponding limiting grooves 16.

[0030] Furthermore, the limiting and fixing component 10 includes a limiting block 17, a push-pull column 18, and a positioning bolt 2 19. The limiting block 17 is slidably disposed in the corresponding limiting groove 16. The limiting block 17 is provided with the push-pull column 18 and the positioning bolt 2 19. The position of the positioning bolt 2 19 corresponds to the sliding groove 3 20. In the non-limiting and fixing state, the limiting block 17 is completely located in the limiting groove 16. In the limiting and fixing state, the limiting block 17 partially slides out of the limiting groove 16, and the positioning bolt 2 19 on the limiting block 17 is located at the end of the corresponding sliding groove 3 20, for fixed connection with the end of the slider 3 in the sliding groove 3 20.

[0031] Installation steps:

[0032] 1. Installation of the air conditioning component fixing support frame:

[0033] First, place the mounting plate 1 in the fixed support frame of the air conditioning component into the predetermined installation position on the railway train, ensuring that the four mounting holes 2 of the mounting plate 1 correspond to the installation positions on the train.

[0034] Then, use appropriate bolts to pass through the mounting holes 2 in sequence and tighten them to fix them on the train, so that the mounting plate 1 is firmly installed on the train.

[0035] Next, place the two L-shaped mounting plates 3 at the corresponding positions on the lower end face of the mounting plate 1, so that the slider 1 on the L-shaped mounting plate 3 is aligned with the groove 4 on the lower end face of the mounting plate 1.

[0036] Push the L-shaped mounting plate 3 so that the slider 1 slides along the slide groove 4 and adjusts the L-shaped mounting plate 3 to the appropriate position.

[0037] Then, the two L-shaped fixing plates 11 are respectively installed on the upper part of the outer side wall of the vertical plate of the two L-shaped mounting plates 3, so that the upper surface of the horizontal plate of the L-shaped fixing plate 11 and the inner side of the vertical plate are respectively attached to the front and rear ends of the lower end of the mounting plate 1 and the front and rear ends of the mounting plate.

[0038] Multiple fixing bolts 12 are passed through the L-shaped fixing plate 11 and the mounting plate 1 in sequence and tightened to fix the L-shaped fixing plate 11 to the mounting plate 1, thereby fixing the position of the L-shaped mounting plate 3.

[0039] Finally, install the inspection door 13 on each of the two L-shaped fixing plates 11, hinge the upper end of the inspection door 13 to the L-shaped fixing plate 11, and lock the lower end of the inspection door 13 to the L-shaped fixing plate 11 with a lock to ensure that the inspection door 13 can be opened and closed normally.

[0040] 2. Installation of the air conditioning component mounting bracket:

[0041] First, multiple support columns 7 are placed at the four corners between the upper slide plate 6 and the lower slide plate 8, so that the multiple support columns 7, the upper slide plate 6 and the lower slide plate 8 form an air conditioning component mounting frame.

[0042] Place the air conditioning component mounting bracket within the space enclosed by the lower end faces of the mounting plate 1 and the two L-shaped mounting plates 3, aligning the sliders on the front and rear sides of the upper end face of the upper slide plate 6 with the sliding grooves 25 on the front and rear sides of the lower end face of the mounting plate 1, and aligning the sliders on the front and rear sides of the lower end face of the lower slide plate 8 with the sliding grooves 320 on the upper end face of the horizontal plates of the two L-shaped mounting plates 3.

[0043] Push the air conditioner component mounting bracket so that slider two slides along slide groove two 5 and slider three slides along slide groove three 20, and install the air conditioner component in the appropriate position. At this time, the air conditioner component mounting bracket is set in the air conditioner component fixed support bracket.

[0044] 3. Installation of air conditioning components:

[0045] Place the air conditioning component 9 on the upper surface of the lower slide plate 8, and ensure that the air conditioning component 9 is firmly connected to the lower slide plate 8. At the same time, check whether the installation position of the air conditioning component 9 is correct and whether all interfaces are tightly connected.

[0046] 4. Installation of limit fasteners:

[0047] Multiple limiting and fixing components 10 are respectively set in the limiting grooves 16 at the left and right ends of the two L-shaped mounting plates 3, so that the limiting block 17 can slide freely in the limiting groove 16.

[0048] Ensure that the position of the positioning bolt 219 on the limit fixing component 10 corresponds to the position of the slide groove 320.

[0049] Working principle:

[0050] Sliding adjustment principle: The L-shaped mounting plate 3 in the air conditioner component mounting bracket is slidably connected to the sliding groove 4 on the mounting plate 1 via slider one, allowing the L-shaped mounting plate 3 to slide and adjust to a certain extent on the mounting plate 1 to adapt to different installation needs. The upper sliding plate 6 in the air conditioner component mounting bracket is slidably connected to the sliding groove 5 on the mounting plate 1 via slider two, and the lower sliding plate 8 is slidably connected to the sliding groove 20 on the L-shaped mounting plate 3 via slider three. This sliding connection structure allows the air conditioner component mounting bracket to be easily slidably installed and removed within the air conditioner component mounting bracket.

[0051] Limiting and fixing principle: The limiting and fixing parts 10 are set at the left and right ends of the L-shaped mounting plate 3. In the non-limiting and fixing state, the limiting block 17 is completely located in the limiting groove 16, and the lower slide plate 8 can slide freely. When limiting and fixing is required, the limiting block 17 is partially slid out of the limiting groove 16 by pushing the push-pull column 18, and the positioning bolt 2 19 on the limiting block 17 is located at the end of the corresponding slide groove 3 20. Tightening the positioning bolt 2 19 fixes it to the end of the slider 3 in the slide groove 3 20, thereby restricting the sliding of the lower slide plate 8 and ensuring the stability of the air conditioning component mounting frame during operation.

[0052] Heat dissipation principle: Multiple heat dissipation slots 15 are opened on the lower slide plate 8. The heat generated by the air conditioning component 9 during operation can be dissipated through the heat dissipation slots 15, which is conducive to the heat dissipation of the air conditioning component 9 and ensures the normal operation of the air conditioning component 9.

[0053] Work process:

[0054] Disassembly process:

[0055] Release the limit: The operator uses a suitable tool to loosen the positioning bolts 19 on the two limit fixing parts 10. Then, holding the push-pull column 18, push the limit block 17 into the limit groove 16, and push the limit block 17 completely into the corresponding limit groove 16, so that the lower slide plate 8 is released from the limit and can slide freely.

[0056] Slide out of the mounting frame: Hold the upper slide plate 6 and the lower slide plate 8 respectively, and apply external force to push the upper slide plate 6 and the lower slide plate 8. The second slider on the upper slide plate 6 slides in the second slide groove 5, and the third slider on the lower slide plate 8 slides in the third slide groove 20, so that the entire air conditioning component mounting frame slides out smoothly from the air conditioning component fixed support frame.

[0057] Disassembling the air conditioning unit: After the air conditioning unit mounting bracket has slid out completely, remove the air conditioning unit 9 from the lower slide plate 8 and inspect or replace the air conditioning unit 9.

[0058] Installation process:

[0059] Install the air conditioning unit: Place the repaired air conditioning unit 9 on the upper surface of the lower slide plate 8, and ensure that the air conditioning unit 9 is firmly connected to the lower slide plate 8. Check that all interfaces are tightly connected.

[0060] Slide into the mounting bracket: Hold the upper slide plate 6 and the lower slide plate 8, and align the entire air conditioning component mounting bracket with the air conditioning component fixing support bracket. Apply external force to push the upper slide plate 6 and the lower slide plate 8, so that the slider 2 on the upper slide plate 6 slides into the slide groove 2 5, and the slider 3 on the lower slide plate 8 slides into the slide groove 3 20, so that the air conditioning component mounting bracket is smoothly slid into the air conditioning component fixing support bracket.

[0061] Limiting and fixing: Push the push-pull column 18 to make the limiting block 17 partially slide out of the limiting groove 16, so that the positioning bolt 2 19 is located at the end of the slide groove 3 20. Use a tool to tighten the positioning bolt 2 19 to fix the lower slide plate 8, and complete the installation of the air conditioning component 9.

[0062] Maintenance process:

[0063] When the air conditioning component 9 needs to be inspected, simply open the inspection door 13 on the L-shaped fixing plate 11. The air conditioning component 9 and its surrounding parts can be inspected, maintained, and parts replaced through the inspection door 13 without having to completely disassemble the entire air conditioning structure, which greatly improves the efficiency of maintenance.

[0064] The railway train air conditioning structure of this utility model enables rapid disassembly and maintenance of air conditioning components, improves maintenance efficiency, reduces maintenance costs, and ensures the normal operation of railway trains.

[0065] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of the equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0066] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A railway train air conditioning structure that is easy to disassemble, assemble, and maintain, characterized in that: The air conditioner assembly fixing support frame body, the air conditioner assembly mounting frame body and the air conditioner assembly (9) are arranged in the mounting air conditioner assembly mounting frame body, the air conditioner assembly mounting frame body is arranged in the air conditioner assembly fixing support frame body, and the air conditioner assembly fixing support frame body is mounted on the railway train.

2. The railway train air conditioning structure easy to disassemble and overhaul according to claim 1, characterized in that: The air conditioner assembly fixing support frame body includes a mounting plate (1) and two L-shaped mounting plates (3) arranged on the lower end surface of the mounting plate (1) along the length direction of the mounting plate (1), and mounting holes (2) are arranged at the four corners of the mounting plate (1), the air conditioner assembly fixing support frame body is mounted on the railway train through the mounting holes (2), and the lower end surface of the mounting plate (1) is provided with a sliding groove (4) on the front and rear sides along the length direction of the mounting plate (1), the two L-shaped mounting plates (3) are arranged oppositely, and the horizontal plates of the two L-shaped mounting plates (3) are located on the opposite inner sides, and the upper end surfaces of the vertical plates of the two L-shaped mounting plates (3) are provided with sliding blocks (1) along the length direction of the L-shaped mounting plate (3), and the two sliding blocks (1) are slidably connected with the corresponding sliding grooves (4).

3. The railway train air conditioning structure easy to disassemble and overhaul according to claim 2, characterized in that: The upper end surfaces of the horizontal plates and the inner side surfaces of the vertical plates of the two L-shaped fixing plates (11) are respectively arranged in close contact with the lower end surface of the mounting plate (1) and the front and rear end surfaces of the mounting plate (1), and the two L-shaped fixing plates (11) are fixedly connected with the mounting plate (1) through a plurality of fixing bolts (12).

4. The railway vehicle air conditioning structure according to claim 3, wherein: The two L-shaped fixing plates (11) are provided with maintenance doors (13), the upper end of the maintenance door (13) is hinged to the L-shaped fixing plate (11), the lower end of the maintenance door (13) is locked to the L-shaped fixing plate (11), and the maintenance door (13) is provided with a handle (14).

5. The railway vehicle air conditioning structure according to claim 4, wherein: The air conditioner assembly mounting frame body includes an upper sliding plate (6), a lower sliding plate (8) and a plurality of support columns (7), the front and rear sides of the lower end surface of the mounting plate (1) are provided with sliding grooves (5) along the length direction of the mounting plate (1), the two sliding grooves (5) are arranged on the inner sides of the corresponding sliding grooves (4), the front and rear sides of the upper end surface of the upper sliding plate (6) are provided with sliding blocks (2) along the length direction of the upper sliding plate (6), the two sliding blocks (2) are slidably connected with the corresponding sliding grooves (5), the upper end surfaces of the horizontal plates of the two L-shaped mounting plates (3) are provided with sliding grooves (20) along the length direction of the L-shaped mounting plate (3), the front and rear sides of the lower end surface of the lower sliding plate (8) are provided with sliding blocks (3) along the length direction of the lower sliding plate (8), the two sliding blocks (3) are slidably connected with the corresponding sliding grooves (20), the plurality of support columns (7) are vertically arranged between the upper sliding plate (6) and the lower sliding plate (8) and located at the four corners of the upper sliding plate (6) and the lower sliding plate (8), and the air conditioner assembly (9) is arranged on the upper end surface of the lower sliding plate (8).

6. The railway vehicle air conditioning structure according to claim 5, wherein: The lower sliding plate (8) is provided with a plurality of heat dissipation grooves (15).

7. The railway vehicle air conditioning structure according to claim 6, wherein: The left and right ends of the two L-shaped mounting plates (3) are slidably provided with limiting fixing members (10), the left and right ends of the horizontal plates of the two L-shaped mounting plates (3) are horizontally provided with limiting grooves (16), and the limiting fixing members (10) are slidably arranged in the corresponding limiting grooves (16).

8. The railway vehicle air conditioning structure according to claim 7, wherein: The limiting fixing part (10) comprises a limiting block (17), a push-pull column (18) and a positioning bolt two (19), the limiting block (17) is slidably arranged in the corresponding limiting groove (16), the push-pull column (18) and the positioning bolt two (19) are arranged on the limiting block (17), the positioning bolt two (19) is arranged at the position corresponding to the sliding groove three (20), in the non-limiting fixing state, the limiting block (17) is completely located in the limiting groove (16), in the limiting fixing state, the limiting block (17) partially slides out of the limiting groove (16), and the positioning bolt two (19) on the limiting block (17) is located at the end of the corresponding sliding groove three (20), for fixed connection with the sliding block three end in the sliding groove three (20).

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