A waterproof distribution box for aviation obstruction lights

Abstract

The utility model discloses a kind of waterproof distribution box for aviation obstruction light, it is related to distribution box technical field, including distribution box body, the top of distribution box body is equipped with sealing cover, the inner wall of distribution box body is equipped with multiple threading holes, the inner wall of threading hole is inserted with sleeve, the utility model has beneficial effect for: by sealing cover and distribution box body sealing cooperation, can effectively waterproof, guarantee internal circuit safety, by the setting of sleeve, mounting ring and sealing tube at threading hole, water resistance can be further enhanced, prevent moisture from cable place infiltration, by the setting of mounting bracket and terminal block in distribution box body interior, line connection and arrangement can be conveniently, by the design of limiting frame and movable block, position can be flexibly adjusted, again by fixed assembly, using screw rod rotation drives first clamping block to move, the line of the aviation obstruction light component of different specifications can be stably fixed, adapt to multiple installation needs.

Description

Technical Field

[0001] This utility model relates to the field of junction box technology, and in particular to a waterproof junction box for aviation obstruction lights. Background Technology

[0002] Waterproof junction boxes for aviation obstruction lights are electrical accessories specifically designed for aviation obstruction lights. They integrate wiring, waterproofing, and protection functions. Their core structure includes a plastic box body, mounting base, wiring fixing socket, and sealing unit. The snap-fit ​​design replaces traditional bolt fixing, greatly improving installation efficiency. The box body is double-sealed with waterproof connectors and waterproof insulating filler material to ensure insulation and waterproofing at the internal wire connections, making it suitable for long-term exposure to harsh environments such as rain, snow, and salt spray. Some products are also equipped with waterproof connectors and terminals, supporting positive, negative, and ground three-wire access, facilitating cable branching and rapid installation of aviation obstruction lights, and effectively reducing the difficulty of high-altitude operations and maintenance costs.

[0003] In the aviation field, aviation obstruction lights are crucial for ensuring flight safety. They provide pilots with clear markings at night or in low-visibility conditions, preventing collisions between aircraft and obstacles. Waterproof junction boxes, as key components in the aviation obstruction light circuit system, directly affect the stable operation of the lights. However, in outdoor environments, junction boxes are susceptible to corrosion from rain and humid air. Once moisture enters the junction box, it can cause short circuits and component damage, severely affecting the normal operation of the aviation obstruction lights and threatening flight safety. Furthermore, existing methods for fixing internal wiring in junction boxes are not flexible enough. It is difficult to securely and conveniently fix wiring of different specifications and routes, causing considerable trouble for staff during installation and maintenance, increasing operational difficulty and time costs. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A waterproof junction box for aviation obstruction lights includes a junction box body, a sealing cover installed on the top of the junction box body, multiple sets of wire-passing holes opened on the inner wall of the junction box body, sleeves inserted into the inner wall of the wire-passing holes, mounting rings fixed at both ends of the sleeves, and one side of the mounting rings fixedly connected to the outer side of the junction box body by screws, and a sealing tube fixed to the inner wall of the sleeves. The junction box body is equipped with an installation frame inside, and multiple sets of terminal blocks are installed on one side of the installation frame. The junction box body is equipped with a limit frame inside, and multiple sets of movable blocks are slidably connected to the inner wall of the limit frame. A fixing component is provided on the top of the movable block. The fixing assembly includes two sets of fixing plates fixed to the outside of the movable block. The inner wall of the fixing plate is threaded with a horizontally arranged screw, and one end of the screw is fixed with a turntable. The other end of the screw is rotatably connected to a first clamping block. Two sets of sliding rods are fixed to the outside of the first clamping block, and the outside of the sliding rods is slidably connected to the inner wall of the fixing plate.

[0006] As a preferred embodiment of the waterproof junction box for aviation obstruction lights described in this utility model, three sets of positioning blocks are fixed on both sides of the junction box body, and multiple sets of positioning grooves are opened on the inner wall of the sealing cover, and the inner wall of the positioning groove fits into the outer side of the positioning block.

[0007] As a preferred embodiment of the waterproof junction box for aviation obstruction lights described in this utility model, a sealing strip is fixed to the top of the junction box body, and the outer side of the sealing strip is in contact with the inner wall of the sealing cover. Multiple sets of card seats are fixed to the inner wall of the junction box body, and multiple sets of snap-fit ​​buckles are fixed to the inner wall of the sealing cover, with the outer side of the snap-fit ​​buckle snapping into the inner wall of the card seat.

[0008] As a preferred embodiment of the waterproof junction box for aviation obstruction lights described in this utility model, the inner wall of the junction box body is fixed with multiple sets of fixing brackets, the inner wall of the fixing brackets is provided with limiting grooves, and the positions of the multiple sets of limiting grooves correspond to the positions of multiple sets of wire holes.

[0009] As a preferred embodiment of the waterproof junction box for aviation obstruction lights described in this utility model, a vertically arranged spring is fixed to the inner wall of the limiting groove, a second clamping block is fixed to the bottom end of the spring, a vertically arranged pull rod is fixed to the outer side of the second clamping block, and the outer side of the pull rod is slidably connected to the inner wall of the fixing frame.

[0010] As a preferred embodiment of the waterproof junction box for aviation obstruction lights described in this utility model, the mounting bracket has multiple sets of locking blocks fixed on one side, and the inner wall of the terminal block has two sets of locking slots, with the inner wall of the locking slots being inserted into the outer side of the locking blocks.

[0011] As a preferred embodiment of the waterproof junction box for aviation obstruction lights described in this utility model, the bottom of the limiting frame is fixed with two sets of mounting seats, and the bottom of the mounting seats is fixedly connected to the inner wall of the junction box body by screws. The inner wall of the limiting frame is fixed with a limiting rod, and the outer side of the limiting rod is slidably connected to the inner wall of the movable block.

[0012] As a preferred embodiment of the waterproof junction box for aviation obstruction lights described in this utility model, a fixing block is fixed to one side of the movable block, a fixing bolt is threadedly connected to the inner wall of the fixing block, a threaded hole is opened on the inner wall of the limiting frame, and the outer side of the fixing bolt is threadedly connected to the inner wall of the threaded hole.

[0013] In summary, this utility model has the following beneficial effects: The sealing cover and junction box body work together to effectively waterproof the wiring and ensure the safety of the internal circuitry. The sleeve, mounting ring, and sealing tube at the wire hole further enhance the waterproof performance and prevent moisture from seeping in through the cables. The mounting bracket and terminal block inside the junction box body facilitate wiring connection and organization. The design of the limiting frame and movable block allows for flexible position adjustment. The fixing components, through the rotation of the screw, drive the first clamping block to move, which can securely fix the wiring of aviation obstruction light components of different specifications, adapting to various installation needs. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them: Figure 1 Overall structural diagram of a waterproof junction box for aviation obstruction lights.

[0015] Figure 2 A structural diagram of the junction box body for use with waterproof junction boxes for aviation obstruction lights.

[0016] Figure 3 A structural diagram of the mounting bracket for a waterproof junction box used in aviation obstruction lights.

[0017] Figure 4 A structural diagram of the mounting components for a waterproof junction box used in aviation obstruction lights.

[0018] Figure 5 for Figure 2 The enlarged structural diagram at point A is shown.

[0019] The following are the labeling elements in the diagram: 1. Junction box body; 2. Sealing cover; 3. Wire hole; 4. Sleeve; 5. Mounting ring; 6. Sealing tube; 7. Mounting bracket; 8. Terminal block; 9. Limiting frame; 10. Movable block; 11. Fixing component; 111. Fixing plate; 112. Screw; 113. First clamping block; 114. Slide rod; 12. Positioning block; 13. Positioning groove; 14. Sealing strip; 15. Card seat; 16. Snap fastener; 17. Fixing bracket; 18. Limiting groove; 19. Spring; 20. Second clamping block; 21. Pull rod; 22. Card block; 23. Card groove; 24. Mounting base; 25. Limiting rod; 26. Fixing block; 27. Fixing bolt; 28. Threaded hole. Detailed Implementation

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0023] Example 1: Reference Figures 1-5 This is the first embodiment of the present utility model. This embodiment provides a waterproof junction box for aviation obstruction lights, including a junction box body 1, a sealing cover 2 installed on the top of the junction box body 1, multiple sets of wire holes 3 opened on the inner wall of the junction box body 1, a sleeve 4 inserted into the inner wall of the wire hole 3, and mounting rings 5 ​​fixed at both ends of the sleeve 4. One side of the mounting ring 5 is fixedly connected to the outer side of the junction box body 1 by screws, and a sealing tube 6 is fixed to the inner wall of the sleeve 4.

[0024] The junction box body 1 serves as the basic frame of the entire waterproof junction box, providing space for internal wiring connections and component installation. It also protects the internal wiring and components from external environmental influences. The sealing cover 2 works in conjunction with the junction box body 1, achieving a sealed junction box and ensuring the internal environment is airtight, preventing moisture and impurities from entering and ensuring the normal operation of the junction box. The wiring hole 3 provides a channel for external wiring to enter the junction box, allowing the wiring to connect smoothly to components such as the terminal block 8 inside the junction box. The sleeve 4 serves as a guide. The mounting ring 5 serves to protect the wiring, making the wiring more orderly when passing through the wire hole 3, and preventing damage to the wiring due to friction between the wiring and the edge of the wire hole 3. The mounting ring 5 is fixedly connected to the outside of the junction box body 1 by screws, and is used to securely install the sleeve 4 at the wire hole 3, enhancing the connection strength between the sleeve 4 and the junction box body 1, and preventing the sleeve 4 from loosening or falling off. The setting of the sealing tube 6 can further enhance the sealing performance at the wire hole 3, preventing moisture from entering the junction box from the gap between the wiring and the sleeve 4, and ensuring the waterproof effect of the junction box. It should be noted that the sealing tube 6 is made of rubber.

[0025] The junction box body 1 has an installation frame 7 installed inside. Multiple sets of terminal blocks 8 are installed on one side of the installation frame 7. A limit frame 9 is installed inside the junction box body 1. Multiple sets of movable blocks 10 are slidably connected to the inner wall of the limit frame 9. A fixing component 11 is provided on the top of the movable block 10.

[0026] The mounting bracket 7 provides a mounting platform for the terminal block 8, facilitating the fixing and wiring connection of the terminal block 8. This allows the terminal blocks 8 to be arranged in an orderly manner, simplifying wiring management and maintenance. The terminal block 8 is a key component for wiring connection, enabling electrical connections between different lines and reliably connecting external lines to the wiring inside the junction box, ensuring normal current transmission. The limiting frame 9 provides a sliding track for the movable block 10, restricting its movement direction so that it can only move in a specific direction. Multiple sets of movable blocks 10 are slidably connected through the inner wall of the limiting frame 9, allowing their positions to be adjusted as needed. This is used to install and fix other components or lines, increasing the flexibility and adjustability of the internal structure of the junction box to adapt to different installation and usage scenarios. The fixing component 11 can fix the wiring inside the junction box body 1 through its internal structure.

[0027] The fixing assembly 11 includes two sets of fixing plates 111 fixed to the outside of the movable block 10. The inner wall of the fixing plate 111 is threaded with a horizontally arranged screw 112, and one end of the screw 112 is fixed with a turntable. The other end of the screw 112 is rotatably connected to a first clamping block 113. Two sets of sliding rods 114 are fixed to the outside of the first clamping block 113, and the outside of the sliding rods 114 is slidably connected to the inner wall of the fixing plate 111.

[0028] The fixing plate 111 is provided to provide a mounting base for the screw 112, so that the screw 112 can be stably mounted on the movable block 10. The screw 112 can be rotated by rotating the turntable, which in turn pushes the first clamping block 113 to move, thereby clamping and fixing the circuit or other components. The first clamping block 113 can clamp the circuit or other components under the push of the screw 112, playing a fixing role and ensuring that the circuit or components are stable in the junction box. The slide bar 114 can play a guiding role, ensuring the stability of the first clamping block 113 during the movement, preventing it from deflecting, and making the clamping force evenly applied to the clamped object.

[0029] Example 2: This is the second embodiment of the present invention, which is based on the previous embodiment.

[0030] Specifically, three sets of positioning blocks 12 are fixed on both sides of the junction box body 1, and multiple sets of positioning grooves 13 are opened on the inner wall of the sealing cover 2, and the inner wall of the positioning groove 13 fits into the outer side of the positioning block 12.

[0031] The positioning block 12 engages with the positioning groove 13 on the inner wall of the sealing cover 2, which plays a positioning role when the sealing cover 2 is installed, so that the sealing cover 2 can be accurately installed on the junction box body 1, ensuring the installation accuracy of the sealing cover 2 and the junction box body 1, and thus ensuring the sealing effect.

[0032] Specifically, a sealing strip 14 is fixed to the top of the junction box body 1, and the outer side of the sealing strip 14 is in contact with the inner wall of the sealing cover 2. Multiple sets of card seats 15 are fixed to the inner wall of the junction box body 1, and multiple sets of snap fasteners 16 are fixed to the inner wall of the sealing cover 2, and the outer side of the snap fasteners 16 is snapped with the inner wall of the card seat 15.

[0033] The sealing strip 14, by adhering to the inner wall of the sealing cover 2, further enhances the sealing performance between the junction box body 1 and the sealing cover 2, preventing moisture from seeping in from the contact surface between the sealing cover 2 and the junction box body 1, and improving the waterproof rating of the junction box. It should be noted that the sealing strip 14 is made of rubber. The card holder 15 is engaged with the snap fastener 16 on the inner wall of the sealing cover 2 to fix the sealing cover 2, so that the sealing cover 2 and the junction box body 1 are tightly connected, enhancing the stability of the overall structure and preventing the sealing cover 2 from loosening or falling off during use. The snap-fit ​​connection facilitates the installation and disassembly of the junction box body 1 and the sealing cover 2, thereby facilitating the inspection and maintenance of the inside of the junction box.

[0034] Specifically, multiple sets of fixing brackets 17 are fixed to the inner wall of the junction box body 1. The inner wall of the fixing brackets 17 is provided with limiting grooves 18, and the positions of the multiple sets of limiting grooves 18 correspond to the positions of the multiple sets of wire holes 3.

[0035] The fixing frame 17 is provided to provide an installation position for components such as the second clamping block 20, and at the same time, it is used to assist in limiting the line passing through the wire hole 3, thereby enhancing the stability of the line. The limiting groove 18 is provided to provide a movement track for the second clamping block 20, restricting its movement direction, so that the second clamping block 20 can accurately limit the line.

[0036] Specifically, a vertically arranged spring 19 is fixed to the inner wall of the limiting groove 18, a second clamping block 20 is fixed to the bottom end of the spring 19, a vertically arranged pull rod 21 is fixed to the outer side of the second clamping block 20, and the outer side of the pull rod 21 is slidably connected to the inner wall of the fixing frame 17.

[0037] The spring 19 is designed to use its elastic force to make the second clamping block 20 clamp the line, thereby achieving automatic clamping and limiting of the line. The second clamping block 20 can limit the line under the action of the spring 19. At the same time, the pull rod 21 fixed on its outer side can be easily pulled manually to adjust its position, so that the operator can easily control the clamping and releasing state of the second clamping block 20.

[0038] Example 3: This is the third embodiment of the present invention, which is based on the first two embodiments.

[0039] Specifically, multiple sets of locking blocks 22 are fixed on one side of the mounting bracket 7, and two sets of locking slots 23 are opened on the inner wall of the terminal block 8, and the inner wall of the locking slot 23 is inserted into the outer side of the locking block 22.

[0040] The locking block 22 is inserted into the locking groove 23 on the inner wall of the terminal block 8 to quickly and easily install and fix the terminal block 8, improve installation efficiency, and at the same time make the connection between the terminal block 8 and the mounting bracket 7 more secure, preventing the terminal block 8 from loosening during use.

[0041] Specifically, two sets of mounting seats 24 are fixed at the bottom of the limiting frame 9, and the bottom of the mounting seats 24 are fixedly connected to the inner wall of the junction box body 1 by screws. A limiting rod 25 is fixed to the inner wall of the limiting frame 9, and the outer side of the limiting rod 25 is slidably connected to the inner wall of the movable block 10.

[0042] Mounting base 24 is fixedly connected to the inner wall of junction box body 1 by screws, and is used to securely install limit frame 9 inside junction box body 1, thereby enhancing the stability of limit frame 9. The setting of limit rod 25 can further limit the movement direction of movable block 10, enhance the stability of movable block 10 movement, and prevent movable block 10 from deviating or shaking during sliding.

[0043] Specifically, a fixing block 26 is fixed on one side of the movable block 10, and a fixing bolt 27 is threadedly connected to the inner wall of the fixing block 26. A threaded hole 28 is opened on the inner wall of the limiting frame 9, and the outer side of the fixing bolt 27 is threadedly connected to the inner wall of the threaded hole 28.

[0044] The fixing block 26 is provided to provide an installation position for the fixing bolt 27 and to fix the movable block 10 in a specific position in the limit frame 9. By rotating the fixing bolt 27, it can be screwed into the threaded hole 28 to fix the movable block 10 and keep the movable block 10 in a stable position in the junction box. The threaded hole 28 is provided to cooperate with the fixing bolt 27 to fix the movable block 10. The threaded connection makes the fixation more firm and reliable and can withstand a certain amount of external force.

[0045] During use, first open the sealing cover 2, then insert the wire through the wire hole 3. The sleeve 4 and sealing tube 6 inside the wire hole 3 prevent moisture from entering. Since the limiting groove 18 on the inner wall of the fixing bracket 17 corresponds to the wire hole 3, the wire can pass through the limiting groove 18 after entering the wire hole 3. At the same time, pull the pull rod 21 upward. The pull rod 21 drives the second clamping block 20 to move upward, so that the second clamping block 20 moves upward against the elastic force of the spring 19. After the wire is placed in, release the pull rod 21. The spring 19 pushes the second clamping block 20 to clamp the wire through the reverse force, which plays a limiting role. Then connect the wire to the terminal block 8 on the mounting bracket 7. The locking block 22 on one side of the mounting bracket 7 is inserted into the locking groove 23 on the inner wall of the terminal block 8, which facilitates quick installation and removal of the terminal block 8. If additional fixing of the wire is required, the movable block 10 slidably connected to the inner wall of the limiting frame 9 can be moved according to the position of the wire. The limiting rod 25 ensures that the movable block 10 can move. After the movable block 10 is moved to the appropriate position, the fixing bolt 27 inside the fixing block 26 is rotated so that it is screwed into the threaded hole 28 on the inner wall of the limiting frame 9, thereby fixing the movable block 10. Then, the turntable at one end of the screw 112 on the fixing plate 111 is rotated. The turntable drives the screw 112 to rotate. The screw 112 drives the first clamping block 113 to move towards the wire under the limit of the slide rod 114 until the wire is clamped. Finally, the sealing cover 2 is put on. The card seat 15 on the inner wall of the junction box body 1 is engaged with the snap fastener 16 on the inner wall of the sealing cover 2, so that the sealing cover 2 is firmly fixed on the junction box body 1, completing the entire installation process. This effectively ensures the waterproof performance of the junction box and the stable connection of the wire. In addition, the positioning blocks 12 on both sides of the junction box body 1 and the positioning grooves 13 on the inner wall of the sealing cover 2 fit together to play a preliminary positioning role. At the same time, the sealing strip 14 on the top of the junction box body 1 fits against the inner wall of the sealing cover 2, which can enhance the sealing performance of the junction box.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A waterproof junction box for aviation obstruction lights, comprising a junction box body (1), characterized in that: The top of the junction box body (1) is fitted with a sealing cover (2). The inner wall of the junction box body (1) has multiple sets of wire holes (3). A sleeve (4) is inserted into the inner wall of the wire hole (3). Both ends of the sleeve (4) are fixed with mounting rings (5). One side of the mounting ring (5) is fixedly connected to the outer side of the junction box body (1) by screws. A sealing tube (6) is fixed to the inner wall of the sleeve (4). The junction box body (1) is equipped with an installation frame (7), and multiple sets of terminal blocks (8) are installed on one side of the installation frame (7). The junction box body (1) is equipped with a limit frame (9), and multiple sets of movable blocks (10) are slidably connected to the inner wall of the limit frame (9). A fixing component (11) is provided on the top of the movable block (10). The fixing component (11) includes two sets of fixing plates (111) fixed to the outside of the movable block (10). The inner wall of the fixing plate (111) is threaded with a horizontally arranged screw (112), and one end of the screw (112) is fixed with a turntable. The other end of the screw (112) is rotatably connected to a first clamping block (113). The outer side of the first clamping block (113) is fixed with two sets of sliding rods (114), and the outer side of the sliding rods (114) is slidably connected to the inner wall of the fixing plate (111).

2. The waterproof junction box for aviation obstruction lights as described in claim 1, characterized in that: Three sets of positioning blocks (12) are fixed on both sides of the junction box body (1), and multiple sets of positioning grooves (13) are opened on the inner wall of the sealing cover (2), and the inner wall of the positioning groove (13) fits with the outer side of the positioning block (12).

3. The waterproof junction box for aviation obstruction lights as described in claim 1, characterized in that: A sealing strip (14) is fixed to the top of the junction box body (1), and the outer side of the sealing strip (14) is in contact with the inner wall of the sealing cover (2). Multiple sets of card seats (15) are fixed to the inner wall of the junction box body (1), and multiple sets of snap fasteners (16) are fixed to the inner wall of the sealing cover (2), and the outer side of the snap fasteners (16) is snapped with the inner wall of the card seat (15).

4. The waterproof junction box for aviation obstruction lights as described in claim 1, characterized in that: The inner wall of the junction box body (1) is fixed with multiple sets of fixing brackets (17), and the inner wall of the fixing brackets (17) is provided with limiting grooves (18), and the positions of the multiple sets of limiting grooves (18) correspond to the positions of the multiple sets of wire holes (3).

5. The waterproof junction box for aviation obstruction lights as described in claim 4, characterized in that: The inner wall of the limiting groove (18) is fixed with a vertically arranged spring (19), the bottom end of the spring (19) is fixed with a second clamping block (20), the outer side of the second clamping block (20) is fixed with a vertically arranged pull rod (21), and the outer side of the pull rod (21) is slidably connected to the inner wall of the fixing frame (17).

6. The waterproof junction box for aviation obstruction lights as described in claim 1, characterized in that: The mounting bracket (7) has multiple sets of locking blocks (22) fixed on one side, and the inner wall of the terminal block (8) has two sets of slots (23), and the inner wall of the slots (23) is inserted into the outer side of the locking blocks (22).

7. The waterproof junction box for aviation obstruction lights as described in claim 1, characterized in that: The bottom of the limiting frame (9) is fixed with two sets of mounting seats (24), and the bottom of the mounting seats (24) is fixedly connected to the inner wall of the junction box body (1) by screws. The inner wall of the limiting frame (9) is fixed with a limiting rod (25), and the outer side of the limiting rod (25) is slidably connected to the inner wall of the movable block (10).

8. The waterproof junction box for aviation obstruction lights as described in claim 1, characterized in that: A fixing block (26) is fixed on one side of the movable block (10), and a fixing bolt (27) is threadedly connected to the inner wall of the fixing block (26). A threaded hole (28) is opened on the inner wall of the limiting frame (9), and the outer side of the fixing bolt (27) is threadedly connected to the inner wall of the threaded hole (28).

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