Displacement-resistant anti-seismic support

Abstract

The utility model relates to an anti-displacement anti-seismic support which comprises a supporting plate, two symmetrically-distributed movable cavities are formed in the top face of the supporting plate, two symmetrically-distributed limiting blocks are arranged on the top face of the supporting plate, and a plurality of air pressure sleeves are arranged between the limiting blocks and the movable cavities. The two ends of the air pressure sleeve are connected with the bottom faces of the limiting blocks and the inner bottom wall of the movable cavity correspondingly, hair clasp assemblies used for fixing a pipeline are arranged on the top faces of the two limiting blocks correspondingly, first damping assemblies are arranged in the two limiting blocks correspondingly, and second damping assemblies are arranged on one sides of the two limiting blocks correspondingly. According to the technical scheme, through the first damping assembly and the second damping assembly, the situation of rapid rebounding can be prevented, meanwhile, the hair clasp assembly can synchronously conduct transverse displacement or longitudinal displacement along with the first damping assembly or the second damping assembly, and therefore the moving distance is limited when the pipeline conducts transverse displacement or longitudinal displacement; and the probability that the pipeline is bent or fractured due to vibration is reduced.

Description

A displacement-resistant and seismic-resistant bracket Technical Field

[0001] This utility model relates to the field of seismic bracing technology, specifically to a displacement-resistant seismic bracing. Background Technology

[0002] During the construction process, pipelines are often laid to transport tap water, fire water, and natural gas. If these pipelines are directly fixed to the walls, they are prone to falling or breaking during an earthquake, which could lead to safety accidents. Given the enormous destructive power of earthquakes, seismic damping and anti-seismic facilities are usually installed during building construction. To prevent pipelines from falling or breaking during an earthquake, seismic supports are often installed on the walls.

[0003] For example, Chinese Patent 202323611747.4 discloses a pipeline seismic support with excellent seismic resistance, including a base. The top of the base has an installation cavity and two sliding grooves. The top of the base has a shock-absorbing structure, and the top of the shock-absorbing structure has a lower clamping plate. First connecting ears are fixed on both sides of the lower clamping plate, and each of the two first connecting ears has two slots. This utility model, by setting up a damper, a sliding rod, a hinge seat, a slider, and a hinge rod, allows the pipeline to move up and down when encountering strong vibrations. The lower clamping plate compresses the damper and drives the hinge rod, which in turn drives the slider. The slider's movement compresses a first spring on one side, which limits the slider's displacement distance, thereby reducing the distance the pipeline moves up and down. The use of the first spring in conjunction with the damper reduces the amplitude and prevents rapid rebound, thus protecting the pipeline.

[0004] However, the above technical solutions are limited to the longitudinal displacement of the pipeline, ignoring the limitation of the lateral displacement. The vibration caused by the earthquake is all-round and complex. While the pipeline is subjected to longitudinal tension or compression, it will also be subjected to strong lateral vibration. This multi-directional vibration will greatly increase the risk of pipeline breakage, detachment or damage, and may even threaten the safety of people's lives. Summary of the Invention

[0005] In view of this, the purpose of this utility model is to provide a displacement-resistant and seismic-resistant bracket to solve the technical problems mentioned in the background art.

[0006] This utility model is achieved through the following technical solution:

[0007] An anti-displacement and anti-seismic support includes a support plate with two symmetrically distributed movable cavities on its top surface. Two symmetrically distributed limiting blocks are also provided on the top surface of the support plate, each located above one of the movable cavities. Multiple pneumatic sleeves are positioned between the limiting blocks and the movable cavities, with both ends of the pneumatic sleeves connected to the bottom wall of the movable cavity via the bottom surface of the limiting blocks. Each limiting block has a clamp assembly on its top surface for fixing a pipeline. A first damping assembly is provided inside each limiting block to dampen lateral displacement of the pipeline. A second damping assembly is provided on one side of each limiting block to dampen longitudinal displacement of the pipeline.

[0008] Furthermore, the first damping component includes two symmetrically distributed damping devices. Both damping devices are laterally distributed. A limiting groove is opened on the top surface of the limiting block. A slider is provided in the limiting groove. Both damping devices are installed in the limiting groove, and the slider is located between the two damping devices. The two ends of the damping devices are connected to one side of the inner wall of the limiting groove and one side of the slider, respectively.

[0009] A fixing block is provided on the top surface of the slider, and the hairband assembly is installed on the top surface of the fixing block.

[0010] Furthermore, two symmetrically distributed connecting grooves are provided on the top surface of the support plate, and a fixing rod is provided in the connecting groove. The fixing rod is distributed along the length of the connecting groove. A connecting plate is provided on the opposite side of the two limiting blocks, and the second shock absorption component is located between the fixing rod and the connecting plate.

[0011] The second shock absorption assembly includes a force-bearing plate, two connecting rods, two movable sleeves, and two first buffer springs. The force-bearing plate is installed on the bottom surface of the connecting plate. The two movable sleeves and the two first buffer springs are respectively sleeved on both ends of the fixed rod. The two ends of the first buffer springs are respectively connected to one side of the movable sleeve and the side wall of the connecting groove. One end of each of the two connecting rods is hinged to both ends of the force-bearing plate through a hinge seat, and the other end is hinged to the two movable sleeves through a hinge seat.

[0012] Furthermore, the hinged seat includes a connecting seat, an ear plate, and a pin. The connecting seat is fixedly installed at the end of the connecting rod, the ear plate is fixedly connected to the end of the force-bearing plate or the movable sleeve, and the pin passes through the connecting seat and the ear plate and is rotatably engaged.

[0013] Furthermore, a second buffer spring is connected between the force-bearing plate and the fixed rod. The second buffer spring is covered with a folded corrugated tube, and the two ends of the second buffer spring and the folded corrugated tube are respectively connected to the bottom surface of the force-bearing plate and the fixed rod.

[0014] Furthermore, the headband assembly includes a lower clamp and an upper clamp. The lower clamp is connected to the fixing block, and one end of the upper clamp and the lower clamp are hinged together by a hinge, while the other end is snapped together by a snap-fit ​​assembly.

[0015] Furthermore, the snap-fit ​​assembly includes a first connecting block and a second connecting block, which are respectively installed on the upper clamp and the lower clamp. The bottom surface of the first connecting block is provided with an installation block, and the installation block has a snap-fit ​​hole. The top surface of the second connecting block has an installation hole that matches the installation block, and a limiting rod that matches the snap-fit ​​hole is provided on one side of the second connecting block.

[0016] Furthermore, the second connecting block on one side of the mounting hole has a mounting cavity and a sliding hole inside. The sliding hole, the mounting cavity, and the mounting hole are connected. The limiting rod is slidably fitted in the sliding hole, the mounting cavity, and the mounting hole. A limiting plate is installed on the limiting rod, and the limiting plate is located in the mounting cavity. A return spring is provided in the mounting cavity. The two ends of the return spring are connected to one side of the limiting plate and one side of the inner wall of the movable cavity, respectively.

[0017] The beneficial effects of this utility model are as follows:

[0018] This anti-displacement and anti-seismic support, through the first and second damping components, can not only prevent rapid rebound, but also allow the clamp component to move laterally or longitudinally in sync with the first or second damping components. This limits the movement distance of the pipeline when it undergoes lateral or longitudinal displacement, reducing the probability of the pipeline bending or breaking due to vibration.

[0019] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0020] Figure 1 is a perspective view (first view) of this utility model;

[0021] Figure 2 is a perspective view (second perspective) of this utility model;

[0022] Figure 3 is a schematic diagram of the second shock absorption component of this utility model;

[0023] Figure 4 is a cross-sectional view of the folded corrugated pipe of this utility model;

[0024] Figure 5 is a schematic diagram of the snap-fit ​​assembly structure of this utility model.

[0025] In the diagram: 1. Support plate; 2. Movable cavity; 3. Limiting block; 4. Pneumatic sleeve; 5. Hairband assembly; 51. Lower clamp; 52. Upper clamp; 6. First damping assembly; 61. Damping device; 62. Limiting groove; 63. Sliding block; 64. Fixing block; 7. Second damping assembly; 71. Force plate; 72. Connecting rod; 73. Movable sleeve; 74. First buffer spring; 75. Hinge seat; 751. Connecting seat; 752. Ear plate; 753, pin; 76, second buffer spring; 77, folded bellows; 8, connecting groove; 9, fixing rod; 10, connecting plate; 11, snap-fit ​​assembly; 111, first connecting block; 112, second connecting block; 113, mounting block; 114, snap hole; 115, mounting hole; 116, limiting rod; 117, mounting cavity; 118, sliding hole; 119, limiting plate; 1110, return spring; 12, pipe. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0031] Please refer to Figures 1-5. This utility model provides a technical solution: an anti-displacement and anti-seismic support, including a support plate 1. The top surface of the support plate 1 has two symmetrically distributed movable cavities 2. The top surface of the support plate 1 is provided with two symmetrically distributed limiting blocks 3. The two limiting blocks 3 are respectively located above the two movable cavities 2. Multiple pneumatic sleeves 4 are provided between the limiting blocks 3 and the movable cavities 2. The two ends of the pneumatic sleeves 4 are respectively connected to the bottom surface of the limiting blocks 3 and the bottom wall of the movable cavity 2. The top surface of each of the two limiting blocks 3 is provided with a hairpin assembly 5 for fixing the pipe 12. The inside of each of the two limiting blocks 3 is provided with a first shock-absorbing assembly 6, which is used to dampen the pipe 12 when it is laterally displaced. The side of each of the two limiting blocks 3 is provided with a second shock-absorbing assembly 7, which is used to dampen the pipe 12 when it is longitudinally displaced.

[0032] In this technical solution, an installation rod is connected between the two headband components 5, and the headband components 5 can be opened or locked simultaneously through the installation rod.

[0033] In practical use, the support plate 1 is installed on the wall or the ground. First, the hair clamp assembly 5 is opened by the installation rod, and the pipe 12 is placed into the hair clamp assembly 5. Then, the hair clamp assembly 5 is locked again by the installation rod. The pipe 12 can be quickly installed or removed. When an earthquake occurs, the pipe 12 will move laterally or longitudinally due to the vibration. When the pipe 12 moves laterally, the vibration generated can be absorbed and buffered by the first shock absorber 6. When the pipe 12 moves longitudinally, the vibration generated can be absorbed and buffered by the second shock absorber 7.

[0034] The first damping component 6 and the second damping component 7 not only prevent rapid rebound, but also allow the headband component 5 to move laterally or longitudinally in sync with the first damping component 6 or the second damping component 7. This limits the movement distance of the pipe 12 when it moves laterally or longitudinally, reducing the probability of the pipe 12 bending or breaking due to vibration.

[0035] In this embodiment: the first damping component 6 includes two symmetrically distributed damping devices 61. Both damping devices 61 are laterally distributed. A limiting groove 62 is opened on the top surface of the limiting block 3. A slider 63 is provided in the limiting groove 62. Both damping devices 61 are installed in the limiting groove 62, and the slider 63 is located between the two damping devices 61. The two ends of the damping devices 61 are respectively connected to one side of the inner wall of the limiting groove 62 and one side of the slider 63.

[0036] A fixing block 64 is provided on the top surface of the slider 63, and the hairband assembly 5 is installed on the top surface of the fixing block 64.

[0037] During an earthquake, the vibration may cause the pipe 12 to move laterally. The slider 63 can slide left or right along the limiting groove 62. The slider 63 drives the fixing block 64, the headband assembly 5, and the pipe 12 to slide left or right simultaneously. When the slider 63 slides left or right, it will push the two shock absorbers 61 respectively, thereby causing them to contract and deform to absorb and buffer the vibration. After the vibration, the pipe 12 will return to its original position, thereby limiting the lateral displacement of the pipe 12.

[0038] In this embodiment: two symmetrically distributed connecting grooves 8 are opened on the top surface of the support plate 1. A fixing rod 9 is provided in the connecting groove 8. The fixing rod 9 is distributed along the length direction of the connecting groove 8. A connecting plate 10 is provided on the opposite side of the two limiting blocks 3. The second shock absorption component 7 is located between the fixing rod 9 and the connecting plate 10.

[0039] The second shock absorption assembly 7 includes a force-bearing plate 71, two connecting rods 72, two movable sleeves 73, and two first buffer springs 74. The force-bearing plate 71 is installed on the bottom surface of the connecting plate 10. The two movable sleeves 73 and the two first buffer springs 74 are respectively sleeved on both ends of the fixed rod 9. The two ends of the first buffer springs 74 are respectively connected to one side of the movable sleeve 73 and the side wall of the connecting groove 8. One end of each of the two connecting rods 72 is hinged to both ends of the force-bearing plate 71 through a hinge seat 75, and the other end is hinged to the two movable sleeves 73 through a hinge seat 75.

[0040] In its natural state, the first buffer spring 74 is naturally extended, and the force plate 71 and the two connecting rods 72 form a bent rod. During an earthquake, the vibration may cause the pipe 12 to move longitudinally, and the pipe 12 will exert a downward force on the limiting block 3. The pneumatic sleeve 4 will contract to absorb and buffer the vibration. At the same time, the connecting plate 10 on one side of the limiting block 3 will move downward synchronously, so that the force plate 71 moves in the direction of the fixed rod 9. As the distance of movement increases, the tilt angle of the two connecting rods 72 gradually increases, and the ends of the two connecting rods 72 connected to the movable sleeve 73 move away from each other, causing the first buffer spring 74 to deform. Thus, the elastic potential energy of the first buffer spring 74 effectively weakens the vibration experienced by the force plate 71 and the pipe 12.

[0041] In this embodiment, the hinge seat 75 includes a connecting seat 751, an ear plate 752, and a pin 753. The connecting seat 751 is fixedly installed on the end of the connecting rod 72, the ear plate 752 is fixedly connected to the end of the force plate 71 or the movable sleeve 73, and the pin 753 passes through the connecting seat 751 and the ear plate 752 and is rotatably engaged.

[0042] The ear plates 752 on both ends of the two connecting rods 72 are respectively embedded into the two ends of the force plate 71 and the connecting seats 751 on the two movable sleeves 73, while the pin 753 passes through to make it rotate and engage.

[0043] In this embodiment: a second buffer spring 76 is connected between the force plate 71 and the fixed rod 9. The second buffer spring 76 is covered with a folded corrugated tube 77. The two ends of the second buffer spring 76 and the folded corrugated tube 77 are respectively connected to the bottom surface of the force plate 71 and the fixed rod 9.

[0044] When the force plate 71 is subjected to pressure, it moves along the direction of the fixed rod 9. During the movement of the fixed rod 9, the second buffer spring 76 and the folded bellows 77 contract, directly applying buffer to the force plate 71, making the force plate 71 less susceptible to deformation due to rigid collisions.

[0045] In this embodiment, the headband assembly 5 includes a lower clamp 51 and an upper clamp 52. The lower clamp 51 is connected to the fixing block 64. One end of the upper clamp 52 and the lower clamp 51 are hinged together by a hinge, and the other end is snapped together by a snap-fit ​​assembly 11.

[0046] When installing pipe 12, the upper clamps 52 of the two clamp components 5 are opened simultaneously by the installation rod. After pipe 12 is installed, the upper clamps 52 and lower clamps 51 are quickly clamped and fixed by the clamping component 11.

[0047] In this embodiment: the snap-fit ​​assembly 11 includes a first connecting block 111 and a second connecting block 112. The first connecting block 111 and the second connecting block 112 are respectively installed on the upper clamp 52 and the lower clamp 51. The bottom surface of the first connecting block 111 is provided with an mounting block 113, and the mounting block 113 is provided with a snap-fit ​​hole 114. The top surface of the second connecting block 112 is provided with a mounting hole 115 that matches the mounting block 113. A limiting rod 116 that matches the snap-fit ​​hole 114 is provided on one side of the second connecting block 112.

[0048] In this technical solution, the bottom surface of the mounting block 113 is hemispherical, and one end of the limiting rod 116 is inclined.

[0049] In use, when it is necessary to lock the upper and lower headbands, pull the mounting rod to make the upper headband move around the hinge until the mounting block 113 on the bottom surface of the first connecting block 111 enters the mounting hole 115 on the top surface of the second connecting block 112. The hemispherical shape of the bottom surface of the mounting block 113 squeezes the cutting-shaped limiting rod 116, causing the limiting rod 116 to retract until the hemispherical shape of the bottom surface of the mounting block 113 exceeds the position of the limiting rod 116 in the mounting hole 115, so that the locking hole 114 on the mounting block 113 is flush with the limiting rod 116, and the limiting rod 116 is inserted into the locking hole 114, thereby fixing the upper and lower headbands.

[0050] In this embodiment: the second connecting block 112 on one side of the mounting hole 115 has a mounting cavity 117 and a sliding hole 118. The sliding hole 118, the mounting cavity 117 and the mounting hole 115 are connected. The limiting rod 116 is slidably fitted in the sliding hole 118, the mounting cavity 117 and the mounting hole 115. A limiting plate 119 is installed on the limiting rod 116 and the limiting plate 119 is located in the mounting cavity 117. A return spring 1110 is provided in the mounting cavity 117. The two ends of the return spring 1110 are respectively connected to one side of the limiting plate 119 and one side of the inner wall of the movable cavity 2.

[0051] In practical use, when the hemispherical shape of the bottom surface of the mounting block 113 presses against the limiting block 3, the limiting rod 116 retracts along the sliding hole 118 and the mounting cavity 117. At the same time, the limiting plate 119 slides along the mounting cavity 117, causing the return spring 1110 to retract until one end of the limiting rod 116 located in the mounting hole 115 is completely retracted into the sliding hole 118, making the locking hole 114 on the mounting block 113 flush with the sliding hole 118. The return spring 1110 changes from a retracted state to a freely extended state, thereby causing the limiting plate 119 to push the limiting rod 116 to slide out along the movable cavity 2 and the sliding hole 118 and enter the locking hole 114. The two upper hairbands and two lower hairbands can be locked and fixed at one time through the mounting rod.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions 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 solutions of this utility model without departing from the spirit and scope of the technical solutions 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 displacement-resistant and seismic-resistant support, comprising a support plate (1), characterized in that: The top surface of the support plate (1) has two symmetrically distributed movable cavities (2). The top surface of the support plate (1) is provided with two symmetrically distributed limiting blocks (3). The two limiting blocks (3) are located above the two movable cavities (2). Multiple pneumatic sleeves (4) are provided between the limiting blocks (3) and the movable cavities (2). The two ends of the pneumatic sleeves (4) are connected to the bottom wall of the movable cavity (2) at the bottom surface of the limiting blocks (3). The top surface of the two limiting blocks (3) is provided with a hairpin assembly (5) for fixing the pipe (12). The inside of the two limiting blocks (3) is provided with a first shock-absorbing assembly (6). The first shock-absorbing assembly (6) is used to dampen the pipe (12) when it moves laterally. The side of the two limiting blocks (3) is provided with a second shock-absorbing assembly (7). The second shock-absorbing assembly (7) is used to dampen the pipe (12) when it moves longitudinally.

2. The anti-displacement and anti-seismic support according to claim 1, characterized in that: The first damping component (6) includes two symmetrically distributed damping dampers (61). Both damping dampers (61) are laterally distributed. The top surface of the limiting block (3) has a limiting groove (62). A slider (63) is provided in the limiting groove (62). Both damping dampers (61) are installed in the limiting groove (62), and the slider (63) is located between the two damping dampers (61). The two ends of the damping damper (61) are respectively connected to one side of the inner wall of the limiting groove (62) and one side of the slider (63). A fixing block (64) is provided on the top surface of the slider (63), and the headband component (5) is installed on the top surface of the fixing block (64).

3. The anti-displacement and anti-seismic bracing according to claim 1, characterized in that: The top surface of the support plate (1) has two symmetrically distributed connecting grooves (8). A fixing rod (9) is provided in the connecting groove (8) and the fixing rod (9) is distributed along the length of the connecting groove (8). A connecting plate (10) is provided on each side of the two limiting blocks (3). The second shock absorber assembly (7) is located between the fixing rod (9) and the connecting plate (10). The second shock absorber assembly (7) includes a force plate (71), two connecting rods (72), two movable sleeves (73), and two first buffer springs. Spring (74), the force plate (71) is installed on the bottom surface of the connecting plate (10), the two movable sleeves (73) and the two first buffer springs (74) are respectively sleeved on both ends of the fixed rod (9), the two ends of the first buffer springs (74) are respectively connected to one side of the movable sleeve (73) and the side wall of the connecting groove (8), one end of the two connecting rods (72) is respectively hinged to both ends of the force plate (71) through the hinge seat (75), and the other end is respectively hinged to the two movable sleeves (73) through the hinge seat (75).

4. The anti-displacement and anti-seismic bracing according to claim 3, characterized in that: The hinge seat (75) includes a connecting seat (751), an ear plate (752), and a pin (753). The connecting seat (751) is fixedly installed on the end of the connecting rod (72). The ear plate (752) is fixedly connected to the end of the force plate (71) or the movable sleeve (73). The pin (753) passes through the connecting seat (751) and the ear plate (752) and is rotatably engaged.

5. The anti-displacement and anti-seismic support according to claim 4, characterized in that: A second buffer spring (76) is connected between the force plate (71) and the fixed rod (9). The second buffer spring (76) is covered with a folded corrugated tube (77). The two ends of the second buffer spring (76) and the folded corrugated tube (77) are respectively connected to the bottom surface of the force plate (71) and the fixed rod (9).

6. The anti-displacement and anti-seismic bracing according to claim 2, characterized in that: The headband assembly (5) includes a lower clamp (51) and an upper clamp (52). The lower clamp (51) is connected to the fixing block (64). One end of the upper clamp (52) and the lower clamp (51) are hinged together by a hinge, and the other end is snapped together by a snap-fit ​​assembly (11).

7. The anti-displacement and anti-seismic bracing according to claim 6, characterized in that: The snap-fit ​​assembly (11) includes a first connecting block (111) and a second connecting block (112). The first connecting block (111) and the second connecting block (112) are respectively installed on the upper clamp (52) and the lower clamp (51). The bottom surface of the first connecting block (111) is provided with an mounting block (113). The mounting block (113) is provided with a snap-fit ​​hole (114). The top surface of the second connecting block (112) is provided with a mounting hole (115) that matches the mounting block (113). A limiting rod (116) that matches the snap-fit ​​hole (114) is provided on one side of the second connecting block (112).

8. The anti-displacement and anti-seismic bracing according to claim 7, characterized in that: The second connecting block (112) on one side of the mounting hole (115) has a mounting cavity (117) and a sliding hole (118) inside. The sliding hole (118), the mounting cavity (117) and the mounting hole (115) are connected. The limiting rod (116) is slidably fitted in the sliding hole (118), the mounting cavity (117) and the mounting hole (115). A limiting plate (119) is installed on the limiting rod (116) and the limiting plate (119) is located in the mounting cavity (117). A return spring (1110) is provided in the mounting cavity (117). The two ends of the return spring (1110) are respectively connected to one side of the limiting plate (119) and one side of the inner wall of the movable cavity (2).

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