Car air conditioner filter element mounting structure

Abstract

The invention relates to the technical field of car air conditioners, and discloses a car air conditioner filter element mounting structure. The car air conditioner filter element installation structure comprises an air conditioner box and an installation cavity formed in the air conditioner box, a telescopic installation base is arranged in the installation cavity, the installation base is a telescopic frame formed by U-shaped plates which are connected in a sleeved mode, and size self-adaption fixing of a filter element is achieved through cooperation of a limiting rod and an inner edge. The pushing assembly combining the magnetic attraction and repulsion principles of an electromagnet plate and a permanent magnet plate is adopted, and the one-button type dismounting function is achieved through relay control; and a locking assembly composed of an L-shaped clamping plate, a compression spring and a chamfering groove is arranged, so that automatic locking and stable unlocking of the mounting base are achieved. According to the structure, the size of a containing cavity is adjusted through cooperation of a U-shaped plate sliding groove and a telescopic plate, air tightness is ensured through an elastic film, and a reset spring assists in pushing out; compared with a traditional structure, the device has the advantages of being labor-saving in operation, high in compatibility, good in sealing performance and the like, is particularly suitable for a high-frequency maintenance scene, and remarkably improves the disassembly and assembly efficiency and reliability.

Description

Technical Field

[0001] The invention relates to the technical field of car air conditioning, and in particular to a car air conditioning filter element installation structure. Background Art

[0002] The existing passenger car air conditioning filter installation structure is composed of an air conditioning box, an installation cavity and a filter element installation seat. An installation cavity is provided in the air conditioning box to accommodate the filter element installation seat and the filter element. An installation port is provided at one end of the installation cavity for sliding the filter element installation seat into. The filter element installation seat is usually a plastic injection molded part, which includes a filter element fixing groove and a connection structure. One end of the filter element installation seat is a plug-in structure, generally a "straight-shaped plug-in boss" or a "T-shaped plug", which is used to insert into the corresponding socket of the air conditioning box. The other end is a clamping structure, which can be a "U-shaped buckle" or an "elastic claw", which is used to fix with the clamping hole on the other side of the air conditioning box.

[0003] During the disassembly process, you need to manually press or bend the free edge of the U-shaped buckle to disengage it from the clamp hole, pull the filter element mounting seat out of the socket in a specific direction, and remove the filter element;

[0004] However, when removing the air-conditioning filter of a car, it is necessary to squeeze or pry the U-shaped buckle with fingers, which is laborious and requires high hand strength. After removal, the filter mounting seat must be pulled out completely manually without the assistance of elastic devices. If the filter mounting seat is not pulled out in the correct direction during removal, the L-shaped plug-in structure will break, and the entire filter mounting seat will need to be replaced, which may even cause the filter to break and remain.

[0005] Therefore, we propose a car air conditioning filter installation structure to solve the problems in the above background. Summary of the invention

[0006] The purpose of the present invention is to provide a car air conditioning filter installation structure to solve the problem that the existing car air conditioning filter proposed in the above background technology needs to be squeezed or bent with fingers when disassembling, which is laborious and requires high hand strength, resulting in inconvenience in disassembly.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] A car air conditioning filter installation structure includes an air conditioning box, wherein an installation cavity is arranged in the air conditioning box, a mounting seat for accommodating the filter element is installed in the installation cavity, a placement cavity for accommodating the filter element is arranged in the installation seat, the installation seat adopts a telescopic structure design for adjusting the internal size of the placement cavity, a pushing component for sliding the mounting seat out is arranged at one end of the inner side of the installation cavity, and a locking component is arranged on the side of the installation cavity close to the mounting seat.

[0009] Preferably, the mounting seat comprises a telescopic frame and an elastic clamp, and the telescopic frame is slidably connected to the interior of the mounting cavity.

[0010] Preferably, one end of the telescopic frame close to the installation cavity is provided with a permanent magnet plate, and an electromagnetic iron plate magnetically coupled with the permanent magnet plate is arranged inside the installation cavity. The electromagnetic iron plate is electrically connected to a relay capable of changing the polarity of the power supply to change the magnetic pole of the electromagnetic iron plate, so as to attract and fix the permanent magnet plate or repel and push it out.

[0011] Preferably, the telescopic frame comprises two mutually sleeved U-shaped plates. The ends of the two U-shaped plates are sleeved with each other, and the two U-shaped plates can slide telescopically to adjust the width of the placement cavity.

[0012] Preferably, an inner edge is arranged at the inner bottom end of the U-shaped plate for supporting the bottom of the air-conditioning filter element. A limiting rod is arranged in the middle of the two U-shaped plates. One end of the limiting rod is rotatably connected to one side of the U-shaped plate, and the other end thereof is clamped to the other side of the U-shaped plate. The inner edge and the limiting rod are respectively located on both sides of the placement cavity for limiting the installation of the air-conditioning filter element.

[0013] Preferably, the elastic clamping member comprises a telescopic plate. The telescopic plate is arranged parallel to the electromagnetic iron plate and is slidably connected between the two U-shaped plates. A return spring is fixedly connected between the telescopic plate and the end of the U-shaped plate away from the permanent magnet plate.

[0014] Preferably, sliding grooves are respectively arranged on the inner sides of the two U-shaped plates, and sliding blocks are respectively arranged at both ends of the telescopic plate. The sliding blocks are slidably connected inside the sliding grooves.

[0015] Preferably, an elastic film is fixedly connected between the telescopic plate and the end of the U-shaped plate away from the permanent magnet plate. The elastic film extends or contracts as the telescopic plate slides, so as to prevent air from flowing through the gap between the telescopic plate and the U-shaped plate.

[0016] Preferably, the locking assembly comprises a mounting plate at the end of the installation cavity and clamping plates on both sides thereof. The mounting plate is used for fixedly connecting with the vehicle frame. The clamping plates are symmetrically arranged on both sides of the mounting plate and are slidably connected to the mounting plate. Compression springs for pushing the clamping plates towards the U-shaped plate are arranged on the outer sides of the clamping plates.

[0017] Preferably, the clamping plate is L-shaped, a chamfered plate is arranged at the end of the U-shaped plate away from the mounting plate, and a chamfered groove cooperating with the chamfered plate is arranged at the end of the clamping plate away from the mounting plate.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0019] The installation structure of the car air conditioner filter element of the present invention realizes the convenient disassembly, installation and anti-damage protection of the filter element through the coordinated work of various rationally designed components. First of all, the installation cavity in the air conditioner box provides a slidable installation space for the filter element, and the installation seat adaptively accommodates filter elements of different sizes through the telescopic structure. The magnetic attraction cooperation between the permanent magnet plate and the electromagnetic iron plate realizes the attraction and fixation or repulsion and pushing out of the installation seat through the switching of the relay, simplifies the drive system, and ensures the simplicity and reliability of the structure; the mechanical locking assembly of the L-shaped clamping plate and the compression spring ensures the stable fixation of the installation seat when not in operation through the self-locking cooperation of the chamfered groove, and also makes the whole installation structure smoother and more smooth when pushing in and pushing out, effectively reducing the operation intensity and avoiding component damage; in addition, the elastic clamping part composed of the U-shaped plate group, the limiting rod and the elastic membrane not only realizes the flexible adjustment of the width of the placement cavity, but also provides adaptive adjustment and additional elastic thrust through the sliding of the telescopic plate and the assistance of the return spring, solving the air leakage problem in the traditional structure and significantly improving the airtightness of the system. Therefore, the installation structure of the car air conditioner filter element not only greatly improves the convenience of installation and disassembly, but also ensures the stability of the filter element during installation, has a wide adaptability and reliability, is particularly suitable for scenarios with frequent maintenance, effectively extends the service life of the product, and has remarkable technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall upper structure of the present invention;

[0021] Figure 2 is a schematic diagram of the overall bottom structure of the present invention;

[0022] Figure 3 is a schematic diagram of the structure of the installation seat of the present invention;

[0023] Figure 4 is of the present invention Figure 3 is an enlarged schematic diagram of part B;

[0024] Figure 5 is of the present invention Figure 3 is an enlarged schematic diagram of part A.

[0025] Wherein: 2, installation cavity; 3, installation seat; 11, telescopic frame; 12, two mutually sleeved U-shaped plates; 13, inner edge; 14, chute; 15, limiting rod; 21, telescopic plate; 22, slider; 23, return spring; 24, elastic membrane; 25, permanent magnet plate; 41, electromagnetic iron plate; 5, locking assembly; 51, mounting plate; 52, clamping plate; 53, chamfered groove; 54, compression spring; 55, chamfered plate; 61, filter element. DETAILED DESCRIPTION OF THE INVENTION

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment 1:

[0028] Please refer to Figures 1-5 , the present invention provides a technical solution:

[0029] An installation structure for a car air-conditioning filter element 61 includes an air-conditioning box. An installation cavity 2 is provided inside the air-conditioning box. An installation seat 3 for accommodating the filter element 61 is fitted inside the installation cavity 2. A placement cavity for accommodating the filter element 61 is provided inside the installation seat 3. The installation seat 3 is designed with a telescopic structure for adjusting the internal dimensions of the placement cavity. At one end of the inner side of the installation cavity 2, a pushing component for sliding the installation seat 3 out is provided. A locking component 5 is provided on the side of the installation cavity 2 close to the installation seat 3. The installation seat 3 includes a telescopic frame 11 and elastic clamping members. The telescopic frame 11 is slidably connected inside the installation cavity 2.

[0030] The pushing component includes a permanent magnet plate 25 provided at one end of the telescopic frame 11 close to the installation cavity 2. An electromagnetic iron plate 41 magnetically coupled with the permanent magnet plate 25 is provided inside the installation cavity 2. The electromagnetic iron plate 41 is electrically connected to a relay that can change the polarity of the power supply, for changing the magnetic pole of the electromagnetic iron plate 41, so as to attract and fix the permanent magnet plate 25, or repel and push it out.

[0031] In the above solution, the installation structure of the car air-conditioning filter element 61 is composed of an air-conditioning box, an installation cavity 2, a telescopic installation seat 3, an electromagnetic drive pushing component, and an elastic locking component 5. Through the coordinated work of each component, the convenient disassembly and assembly of the filter element 61 and anti-damage protection are realized.

[0032] An integrally formed installation cavity 2 is provided inside the air-conditioning box. The front end of the cavity is an installation opening for the horizontal sliding insertion of the installation seat 3. The electromagnetic iron plate 41 is fixedly provided at the inner end of the installation cavity 2. The electromagnetic iron plate 41 is connected to the vehicle-mounted power supply and controls the current direction through a relay to switch the magnetic pole. A locking component 5 is provided on the side close to the installation opening, including an L-shaped clamping plate 52, a compression spring 54, and a mounting plate 51 fixed to the side wall of the installation cavity 2. The L-shaped clamping plates 52 are symmetrically distributed on both sides of the mounting plate 51 and are pre-pressed by the compression spring 54. A chamfer groove 53 is provided at the end of the clamping plate 52 to form a self-locking structure with the chamfer plate 55 at the end of the installation seat 3.

[0033] The electromagnetic iron plate 41 realizes the dual functions of "adsorption and fixation" and "repulsion and ejection" through polarity switching. Combining with the passive response of the permanent magnet plate 25, it does not require a complex mechanical transmission system, with a simple structure and high reliability.

[0034] Through the cooperation of the L-shaped splint 52 and the chamfered plate 55, it has both self-locking and guiding functions. It can be automatically aligned when pushed in and smoothly detached when disassembled, thus significantly reducing the operation intensity and the component damage rate. This installation structure adopts a modular structure with strong compatibility and is applicable to various car air conditioning systems, having high market application value.

[0035] Embodiment 2:

[0036] Combined with Embodiment 1, it is further obtained that

[0037] In this embodiment, the telescopic frame 11 includes two mutually sleeved U-shaped plates 12. The ends of the two U-shaped plates are sleeved with each other, and the two U-shaped plates can slide telescopically, so that the two U-shaped plates approach or move away from each other to realize the adjustment of the width of the internal space of the placement cavity.

[0038] An inner edge 13 is provided at the inner bottom end of the U-shaped plate. The inner edge 13 is used for the bottom support of the air filter element 61. A limiting rod 15 is provided in the middle of the two U-shaped plates. One end of the limiting rod 15 is rotatably connected to one side of the U-shaped plate, and the other end is clamped to the other side of the U-shaped plate. In a clamping manner, the limiting rod 15 is L-shaped and rotates with the rotation connection end as the fulcrum for opening or closing. When the limiting rod 15 is clamped and fixed to the side surface of the U-shaped plate, the filter element 61 inside the placement cavity is limited to prevent it from shaking.

[0039] The inner edge 13 and the limiting rod 15 are respectively located on both sides of the placement cavity and are used for the installation limit of the air filter element 61.

[0040] The elastic clamping member includes a telescopic plate 21. The telescopic plate 21 is arranged parallel to the electromagnetic iron plate 41 and is slidably connected between the two U-shaped plates. A return spring 23 is fixedly connected between the telescopic plate 21 and the end of the U-shaped plate far from the permanent magnet plate 25.

[0041] Chute 14s are respectively arranged on the inner sides of the two U-shaped plates. Sliders 22 are respectively arranged at both ends of the telescopic plate 21. The sliders 22 are slidably connected inside the chute 14s. The telescopic plate 21 is guided to stably slide along the direction of the chute 14s through the sliders 22. The length of the placement chamber is adjusted through the sliding of the telescopic plate 21, so as to be applicable to the installation of filter elements 61 of different lengths. At the same time, the telescopic plate 21 can follow the adjustment of the distance between the two U-shaped plates and thus follow the telescoping.

[0042] Further, an elastic membrane 24 is fixedly connected between the telescopic plate 21 and the end of the U-shaped plate away from the permanent magnet plate 25. The elastic membrane 24 extends or contracts as the telescopic plate 21 slides, so as to prevent air from flowing through the gap between the telescopic plate 21 and the U-shaped plate.

[0043] In the above solution, on the basis of Embodiment 1, this embodiment realizes multi-dimensional adjustment and stable fixation of the filter element 61 mounting seat 3 through the collaborative cooperation of the innovative adjustable U-shaped plate group, the limiting rod 15 locking mechanism and the elastic sealing component. Specifically, the structure mainly consists of two mutually sleeved U-shaped plates that form the main body of the telescopic frame 11. Manual telescopic adjustment is realized through the cooperation of the end chute 14 and the slider 22, and the width of the placement cavity can be flexibly adjusted to adapt to filter elements 61 of different sizes. Among them, the innovative design of the L-shaped limiting rod 15 is relatively crucial. One end of it is rotatably connected to the U-shaped plate, and the other end can be clamped and fixed. By clamping the L-shaped end of the limiting rod 15 to the outside of the U-shaped plate, the width of the telescopic frame 11 can be reliably locked after the adjustment is in place. At the same time, in cooperation with the inner edge 13 structure at the bottom end of the inner side of the U-shaped plate, upper and lower bidirectional limiting of the filter element 61 is formed, effectively preventing the filter element 61 from shaking.

[0044] In the elastic clamping part, the parallel telescopic plates 21 cooperate with the U-shaped plate chute 14 through the sliders 22 and can slide and adjust along the direction of the chute 14. In cooperation with the return spring 23, it not only realizes the adaptive adjustment of the length of the placement cavity, but also provides an additional elastic auxiliary thrust during disassembly. It is particularly worth mentioning that the elastic membrane 24 arranged between the telescopic plate 21 and the U-shaped plate can automatically extend or contract as the telescopic plate 21 moves, perfectly solving the air leakage problem existing in the traditional structure and significantly improving the airtightness of the system.

[0045] In actual operation, during installation, only need to simply stretch the U-shaped plate to adjust the width, put the filter element 61 in, and lock the limiting rod 15, then push the whole into the mounting seat 3 to automatically complete the mechanical locking; during disassembly, through the dual action of the electromagnetic repulsion force and the return spring 23, the mounting seat 3 can pop out smoothly, completely avoiding the problem that the traditional structure needs to press the buckle with effort. After testing, the operating force of this structure is only 20% of that of the traditional structure, and it can adapt to different specifications of filter elements 61, including various types such as PM2.5 filter elements 61 and activated carbon filter elements 61.

[0046] The innovation of this design is mainly reflected in three aspects: (1) The modular telescopic adjustment mechanism realizes two-way self-adaptation in length and width; (2) The collaborative control of electromagnetic drive and elastic assistance ensures stable operation; (3) The functions of sealing and limiting are highly integrated in a limited space. The above innovations not only solve the problems of laborious disassembly and poor compatibility of the traditional structure, but also significantly improve the reliability and service life of the product, and are particularly suitable for high-frequency maintenance scenarios such as taxis and shared cars, as well as the use requirements in harsh environments such as dusty and humid conditions, and have broad market application prospects.

[0047] Embodiment Three:

[0048] Combined with Embodiment One, it is further obtained that

[0049] In another embodiment, the locking component 5 includes a mounting plate 51 at the end of the mounting cavity 2 and clamping plates 52 on both sides thereof. The mounting plate 51 is used for fixedly connecting with the vehicle frame. The clamping plates 52 are symmetrically arranged on both sides of the mounting plate 51, and the clamping plates 52 are slidably connected with the mounting plate 51. A compression spring 54 for pushing it towards the U-shaped plate is arranged on the outer side of the clamping plate 52.

[0050] The clamping plate 52 is L-shaped. A chamfer plate 55 is arranged at one end of the U-shaped plate away from the mounting plate 51, and a chamfer groove 53 for cooperating with the chamfer plate 55 is arranged at one end of the clamping plate 52 away from the mounting plate 51.

[0051] Through the above technical solution, Embodiment Three optimizes the design of the locking component 5 on the basis of Embodiment One, and realizes more reliable installation and fixation and more convenient disassembly operation through a mechanical locking mechanism.

[0052] The locking component 5 is mainly composed of a mounting plate 51, an L-shaped clamping plate 52 and a compression spring 54. The mounting plate 51 is fixedly connected to the vehicle frame and serves as the basic support for the entire locking mechanism. Two groups of symmetrically arranged L-shaped clamping plates 52 are installed on both sides of the mounting plate 51 by a sliding connection method. The compression spring 54 arranged on the outer side of the clamping plate 52 continuously applies an inward pressure to ensure that the clamping plate 52 always has a tendency to approach the U-shaped plate.

[0053] During the actual working process, when the mounting seat 3 is pushed into the mounting cavity 2, the chamfer plate 55 at the end of the U-shaped plate will interact with the chamfer groove 53 on the clamping plate 52: during the pushing stage, the inclined surface of the chamfer plate 55 will gradually squeeze the clamping plate 52 to slide outwards, and the compression spring 54 stores energy accordingly; when the mounting seat 3 is in place completely, the clamping plate 52 rebounds rapidly under the action of the spring force, and the chamfer groove 53 and the chamfer plate 55 form a tight bite to achieve reliable mechanical locking. This design has multiple advantages: firstly, the chamfer matching structure enables the locking process to be completed automatically without additional operations; secondly, the continuous pressure provided by the compression spring 54 ensures the stability of locking; furthermore, the symmetrical arrangement of the L-shaped clamping plates 52 makes the force more balanced.

[0054] During disassembly, after the electromagnetic pushing component is started, during the process of the mounting seat 3 moving outwards, the end of the U-shaped plate will contact the inclined surface of the chamfer groove 53 again. At this time, the lateral component force generated will push the clamping plate 52 to slide outwards, and the compression spring 54 is compressed. When the U-shaped plate completely disengages from the chamfer groove 53, the locking is released. The whole process is smooth and stable, which not only ensures the reliability of locking but also realizes easy unlocking, completely avoiding the inconvenience of the traditional structure that requires pressing the buckle with great force.

[0055] In addition, all the stressed components of the locking assembly 5 are made of high-strength engineering plastics, which not only ensure the structural strength but also have good wear resistance and service life, and are particularly suitable for the usage scenario where the automotive air filter element 61 needs to be frequently disassembled and assembled. This innovative locking mechanism cooperates with the electromagnetic driving assembly of the first embodiment to form a complete intelligent disassembly and assembly system, significantly improving the user experience and maintenance efficiency.

[0056] Although the specific embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these specific embodiments without departing from the principle and spirit, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A car air conditioning filter (61) installation structure, comprising an air conditioning box, characterized in that: The air conditioning box is provided with an installation cavity (2), a mounting seat (3) for accommodating a filter element (61) is installed in the installation cavity (2), a placement cavity for accommodating the filter element (61) is provided in the installation seat (3), the installation seat (3) adopts a telescopic structure design, and is used to adjust the internal size of the placement cavity, a pushing component for sliding the installation seat (3) is provided at one end of the inner side of the installation cavity (2), and a locking component (5) is provided on the side of the installation cavity (2) close to the installation seat (3).

2. The installation structure of a passenger car air conditioning filter (61) according to claim 1, characterized in that: The mounting seat (3) comprises a telescopic frame (11) and an elastic clamp, and the telescopic frame (11) is slidably connected to the inside of the mounting cavity (2).

3. The installation structure of a passenger car air conditioning filter (61) according to claim 1, characterized in that: The pushing component comprises a telescopic frame (11) having a permanent magnet plate (25) disposed at one end thereof close to the mounting cavity (2), an electromagnet plate (41) magnetically matched with the permanent magnet plate (25) disposed inside the mounting cavity (2), the electromagnet plate (41) being electrically connected to a relay capable of changing the polarity of a power supply, and being used to change the magnetic pole of the electromagnet plate (41), thereby being able to attract and fix the permanent magnet plate (25), or to repel and push it out.

4. The installation structure of a passenger car air conditioning filter (61) according to claim 1, characterized in that: The telescopic frame (11) comprises two mutually sleeved U-shaped plates (12), the ends of the two U-shaped plates being sleeved, and the two U-shaped plates can slide and telescope to adjust the width of the placement cavity.

5. The installation structure of a passenger car air conditioning filter (61) according to claim 4, characterized in that: An inner edge (13) is provided at the inner bottom end of the U-shaped plate, and the inner edge (13) is used to support the bottom of the air conditioning filter element (61). A limiting rod (15) is provided in the middle of the two U-shaped plates, and one end of the limiting rod (15) is rotatably connected to the U-shaped plate on one side, and the other end is clamped with the U-shaped plate on the other side. The inner edge (13) and the limiting rod (15) are respectively located on both sides of the placement cavity, and are used to limit the installation of the air conditioning filter element (61).

6. A car air conditioning filter (61) installation structure according to claim 5, characterized in that: The elastic clamp comprises a telescopic plate (21), which is arranged parallel to the electromagnet plate (41) and slidably connected between the two U-shaped plates, and a return spring (23) is fixedly connected between the telescopic plate (21) and one end of the U-shaped plate away from the permanent magnet plate (25).

7. A car air conditioning filter (61) installation structure according to claim 6, characterized in that: The inner sides of the two U-shaped plates are respectively provided with sliding grooves (14), and the two ends of the telescopic plate (21) are respectively provided with sliding blocks (22), and the sliding blocks (22) are slidably connected to the inside of the sliding grooves (14).

8. The installation structure of a passenger car air conditioning filter (61) according to claim 7, characterized in that: An elastic membrane (24) is fixedly connected between the telescopic plate (21) and one end of the U-shaped plate away from the permanent magnet plate (25). The elastic membrane (24) extends or contracts as the telescopic plate (21) slides, so as to prevent air from flowing through the gap between the telescopic plate (21) and the U-shaped plate.

9. The installation structure of a passenger car air conditioning filter (61) according to claim 1, characterized in that: The locking assembly (5) comprises a mounting plate (51) at the end of the mounting cavity (2) and clamping plates (52) on both sides thereof. The mounting plate (51) is used for fixed connection with the vehicle frame. The clamping plates (52) are symmetrically arranged on both sides of the mounting plate (51). The clamping plates (52) are slidably connected to the mounting plate (51). A compression spring (54) is arranged on the outer side of the clamping plate (52) to push it toward the U-shaped plate.

10. The installation structure of a passenger car air conditioning filter (61) according to claim 5, characterized in that: The clamping plate (52) is L-shaped, and a chamfered plate (55) is provided at one end of the U-shaped plate away from the mounting plate (51), and a chamfered groove (53) matching with the chamfered plate (55) is provided at one end of the clamping plate (52) away from the mounting plate (51).

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