Pure mechanical counterweight type lifting ground well for aviation service

Abstract

The invention relates to an aviation service pure mechanical balance weight type lifting ground well and belongs to the technical field of aviation ground well equipment, the aviation service pure mechanical balance weight type lifting ground well comprises a well body, a lifting frame arranged in the well body in a sliding mode and a lifting box arranged on the lifting frame, and the cross section area of the lifting box is smaller than that of a well opening of the well body; a sliding plate is arranged in the well body in a sliding mode, the sliding direction of the sliding plate is perpendicular to the sliding direction of the lifting frame, and an adsorption part used for adsorbing the lifting box to slide in the direction close to the well body is arranged on the sliding plate. The lifting device has the advantages that an operator can conveniently push the lifting box into the well body, and labor is saved during operation.

Description

Technical Field

[0001] The present application relates to the technical field of aviation well equipment, and in particular to a purely mechanical counterweight lifting well for aviation services. Background Art

[0002] Aircraft service wells are essential equipment to ensure the safe operation of aircraft. They integrate energy sources such as "water, electricity, gas, oil, and air conditioning" and are installed at locations such as near-parking positions, far-parking positions, and hangars through pre-set embedded wells to achieve energy supply nearby. At present, among aircraft service wells, lift-type wells are widely used due to their advantages such as multiple functions and large size.

[0003] In the related art, a Chinese patent document with publication number CN207644663U discloses a purely mechanical counterweight lifting well, which includes a well body, a fixed frame, a lifting frame, a lifting box and a balancing counterweight assembly. The fixed frame is fixed in the well body, and a well ring fixedly connected to the fixed frame is arranged at the wellhead of the well body. The lifting frame is slidably arranged in the fixed frame, and the balancing counterweight assembly is connected to the lower end of the lifting frame. The lifting box is fixed at the upper end of the lifting frame. A well cover adapted to the well ring is fixedly arranged on the lifting box, and a locking member for locking the lifting box is arranged on the well cover. When the lifting box needs to be used, the operator pulls the handle of the locking member by hand to disengage the locking tongue from the well ring, and the equipment is lifted under the action of the balancing counterweight assembly; when the lifting box is finished and the equipment needs to be closed, the operator acts on the well cover downward to move the well cover downward to a specified position and then locks it with the locking tongue in the locking member.

[0004] With respect to the above-mentioned related technologies, when the equipment needs to be closed and the manhole cover is facing downward, it is rather laborious to press it by hand because the manhole cover is usually located above the operator's knees. Summary of the invention

[0005] In order to facilitate the operator to push the lifting box into the well body and realize labor-saving operation, the present application provides a purely mechanical counterweight lifting well for aviation services.

[0006] The present application provides a purely mechanical counterweight lifting shaft for aviation services, which adopts the following technical solution: A purely mechanical counterweight lifting shaft for aviation services comprises a shaft body, a lifting frame slidably arranged in the shaft body and a lifting box arranged on the lifting frame, wherein the cross-sectional area of ​​the lifting box is smaller than the cross-sectional area of ​​the wellhead of the shaft body, a sliding plate slidably arranged in the shaft body, the sliding direction of the sliding plate being perpendicular to the sliding direction of the lifting frame, and an adsorption member for adsorbing the lifting box to slide toward the shaft body is arranged on the sliding plate.

[0007] Preferably, the adsorption member includes a first magnet arranged on the sliding plate and a second magnet arranged on the lifting box, the first magnet is used to adsorb the second magnet to drive the lifting box to slide toward the direction close to the well body, and when the lifting box is extended out of the well body, the second magnet is located above the first magnet.

[0008] Preferably, when the first magnet and the second magnet are adsorbed and matched, the distance from the manhole cover on the lifting box to the wellhead of the well body is less than 50 cm.

[0009] Preferably, the second magnet is slidably disposed on the lifting box, and the sliding direction of the second magnet is parallel to the sliding direction of the lifting frame. A pushing member is disposed on the lifting box, and the pushing member is used to push the sliding plate to slide in a direction away from the lifting box when the lifting box descends.

[0010] Preferably, the pushing member includes a pushing block arranged on the lifting box, a side of the pushing block away from the lifting box is an inclined surface, the distance from the inclined surface to the lifting box decreases in the direction away from the manhole cover, and the inclined surface is used for slidingly abutting against a side of the sliding plate close to the lifting box.

[0011] Preferably, a foot push plate is slidably provided on the sliding plate, the sliding direction of the foot push plate is parallel to the sliding direction of the lifting frame, the foot push plate is aligned with the wellhead of the well body, and the lifting box is provided with an abutment member for pushing the foot push plate to move toward the outside of the well body.

[0012] Preferably, the abutment member comprises an abutment plate arranged on the lifting box, the abutment plate is located below the foot push plate, and the abutment plate is used to push the foot push plate to move toward the outside of the well body.

[0013] Preferably, two sliding plates are relatively arranged along the axis of the well body, the lifting box is located between the two sliding plates, the second magnets correspond one-to-one with the first magnets on the sliding plates, and the abutment plates correspond one-to-one with the foot push plates on the sliding plates.

[0014] Preferably, the foot push plate and the push block are staggered.

[0015] Preferably, a guide group is provided in the well body, the guide group includes a plurality of guide rods provided in the well body, the sliding plate is slidably sleeved on the plurality of guide rods, and a cushion layer for increasing the friction between the guide rods and the sliding plate is provided on the guide rods.

[0016] In summary, this application includes the following beneficial technical effects: When the lifting box is extended out of the well body and is finished being used, the sliding plate is pushed to slide toward the lifting box, so that the sliding plate is close to the lifting box. The lifting box is adsorbed by the adsorption parts on the sliding plate and slides a certain distance toward the well body, thereby lowering the height of the manhole cover on the lifting box, making it convenient for the operator to step on the manhole cover to continue pushing the lifting box into the well body, realizing labor-saving operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0018] Figure 2 It is a partial structural cross-sectional view of an embodiment of the present application.

[0019] Figure 3 It is a partial structural diagram of an embodiment of the present application.

[0020] Explanation of the reference numerals in the accompanying drawings: 1. Well body; 2. Lifting frame; 3. Lifting box; 4. Sliding plate; 5. Adsorption member; 51. First magnet; 52. Second magnet; 6. Push block; 7. Inclined surface; 8. Foot push plate; 9. Abutment plate; 10. Guide group; 101. Guide rod; 11. Well ring; 12. Slide groove. DETAILED DESCRIPTION

[0021] The following combination Figure 1-Figure 3 This application is described in further detail.

[0022] The present application embodiment discloses a purely mechanical counterweight lifting shaft for aviation services. Figure 1 and Figure 2 The purely mechanical counterweight lifting shaft for aviation services comprises a shaft body 1, a lifting frame 2 and a lifting box 3. The cross section of the shaft body 1 is square. In other embodiments, the cross section of the shaft body 1 can be designed to be circular or other shapes as needed; the lifting frame 2 is slidably arranged on a fixed frame in the shaft body 1, and the sliding direction of the lifting frame 2 is arranged along the vertical direction. Specifically, the lifting method of the lifting frame 2 is the same as that in the related art, and a balanced counterweight assembly is adopted, which will not be elaborated here.

[0023] Reference Figure 1 and Figure 2 A well ring 11 is installed at the wellhead of the well body 1. The well ring 11 is a square ring, and the inner side length of the well ring 11 is smaller than the side length of the wellhead of the well body 1. The lifting box 3 is fixedly installed at the upper end of the lifting frame 2, and the cross-sectional area of ​​the lifting box 3 is smaller than the cross-sectional area of ​​the wellhead of the well body 1. Furthermore, in order to facilitate the lifting box 3 to be moved out of or into the well body 1, the cross-sectional area of ​​the lifting box 3 is smaller than the cross-sectional area of ​​the central opening of the well ring 11.

[0024] Reference Figure 2 and Figure 3A sliding plate 4 is slidably arranged in the well body 1, and the sliding plate 4 is located below the well circle 11. The sliding plate 4 slides in a direction close to or away from the lifting box 3, and the sliding direction of the sliding plate 4 is perpendicular to the sliding direction of the lifting frame 2. Further, the sliding direction of the sliding plate 4 is perpendicular to the plane where the functional module on the lifting box 3 is located; in order to facilitate the guiding of the sliding of the sliding plate 4, a guide group 10 is fixed in the well body 1, and the guide group 10 includes a plurality of guide rods 101 fixed in the well body 1, and the arrangement direction of the plurality of guide rods 101 is parallel to the length direction of the sliding plate 4, and the sliding plate 4 is slidably sleeved on the plurality of guide rods 101 of the corresponding guide group 10; an adsorption member 5 for adsorbing the lifting box 3 to slide in a direction close to the well body 1 is provided on the sliding plate 4.

[0025] When the lifting box 3 is in the well body 1 and the equipment is in the closed state, the sliding plate 4 is in the initial state, that is, the sliding plate 4 is away from the lifting box 3, and the side of the sliding plate 4 close to the lifting box 3 is at a certain distance from the lifting box 3, so that the lifting box 3 will not interfere with the sliding plate 4 when it rises. When the lifting box 3 is extended out of the well body 1 and the equipment needs to be closed, the sliding plate 4 is pushed to slide in the direction close to the lifting box 3, so that the sliding plate 4 is close to the lifting box 3, and the suction piece 5 on the sliding plate 4 sucks the lifting box 3 to slide in the direction close to the well body 1 for a certain distance, thereby changing the original balance state of the lifting box 3, lowering the height of the well cover on the lifting box 3, and making it convenient for the operator to step on the well cover to continue to push the lifting box 3 into the well body 1, realizing labor-saving operation.

[0026] Reference Figure 2 and Figure 3 In order to facilitate the adsorption of the lifting box 3 and slide it toward the direction close to the well body 1, the adsorption member 5 includes a first magnet 51 and a second magnet 52. The first magnet 51 is embedded in a side of the sliding plate 4 close to the well ring 11. In order to help improve the adsorption force, two first magnets 51 are relatively arranged on the sliding plate 4; the second magnet 52 is arranged on the lifting box 3, and the second magnet 52 corresponds to the first magnet 51 one by one. The first magnet 51 is used to adsorb the corresponding second magnet 52 to drive the lifting box 3 to slide toward the direction close to the well body 1. The two first magnets 51 and the second magnets 52 are arranged on the sliding plate 4. The sum of the adsorption force between the two magnets 52 and the gravity of the lifting box 3 is greater than the gravity of the balancing weight assembly. When the lifting box 3 is extended out of the well body 1, the second magnet 52 is located above the first magnet 51; when the sliding plate 4 is retracted to the bottom of the well circle 11, the distance between the sliding plate 4 and the surface of the lifting box 3 is greater than the distance from the side of the second magnet 52 away from the lifting box 3 to the surface of the lifting box 3, so that when the sliding plate 4 is in a retracted state, it will not affect the lifting box 3 to drive the second magnet 52 to rise, and at this time, the first magnet 51 is misaligned with the corresponding second magnet 52.

[0027] When the lifting box 3 is used up and needs to be pushed back into the well body 1, the sliding plate 4 is pushed to slide in the direction close to the lifting box 3, so that the sliding plate 4 drives the first magnet 51 close to the lifting box 3, and then the first magnet 51 on the sliding plate 4 moves to just below the corresponding second magnet 52 on the lifting box 3, and then the first magnet 51 absorbs the corresponding second magnet 52 to drive the lifting box 3 to slide a certain distance in the direction close to the well body 1, until the first magnet 51 and the corresponding second magnet 52 are absorbed and fixed, thereby lowering the position of the manhole cover on the lifting box 3, and then the sliding plate 4 is pushed in the direction away from the lifting box 3 for recovery, so that the first magnet 51 and the second magnet 52 are separated, so that it is convenient for the operator to step on the manhole cover to continue to push the lifting box 3 into the well body 1, which helps to save effort.

[0028] Reference Figure 2 When the first magnet 51 and the second magnet 52 are attracted and matched, the distance from the manhole cover on the lifting box 3 to the wellhead of the well body 1 is less than 50 cm, which further facilitates the operator to step on the manhole cover to push the lifting box 3 into the well body 1.

[0029] Reference Figure 2 and Figure 3 To further facilitate the operation of the users, two sliding plates 4 are relatively arranged along the axis of the well body 1, and the lifting box 3 is located between the two sliding plates 4. The guide group 10 corresponds to the sliding plates 4 one by one, and the second magnet 52 corresponds to the first magnet 51 on the sliding plate 4 one by one, so that the user can operate the sliding plate 4 on the corresponding side to realize the lowering of the lifting box 3 no matter which side of the lifting box 3 the user is located.

[0030] Reference Figure 2 and Figure 3 In order to facilitate the lifting box 3 to push the sliding plate 4 to be recovered during the descent process, the second magnet 52 is slidably arranged on the lifting box 3, and the sliding direction of the second magnet 52 is parallel to the sliding direction of the lifting frame 2. The lifting box 3 slides with the second magnet 52 by providing a slide groove 12 or installing a slide rail. In the embodiment of the present application, the lifting box 3 slides with the second magnet 52 by providing a slide groove 12. The shape of the second magnet 52 located in the slide groove 12 is a dovetail shape, so that the second magnet 52 and the lifting box 3 will not be separated; a pushing member is provided on the lifting box 3, and the pushing member is used to push the sliding plate 4 to slide in a direction away from the lifting box 3 when the lifting box 3 descends.

[0031] Reference Figure 2 and Figure 3In order to facilitate the sliding plate 4 to slide in the direction away from the lifting box 3 when the lifting box 3 is lowered, when the sliding plate 4 moves to the position closest to the lifting box 3, there is a certain distance between the lifting box 3 and the lifting box 3, and the pushing member includes a pushing block 6 fixedly arranged on the lifting box 3, and the pushing block 6 corresponds to the sliding plate 4 one by one. The pushing block 6 is located between the two second magnets 52 on the corresponding side, and the distance from the lower edge of the pushing block 6 to the lower end of the slide groove 12 is greater than the thickness of the second magnet 52, and the distance from the upper edge of the pushing block 6 to the upper end of the slide groove 12 is greater than the thickness of the second magnet 52. The functional modules on the box 3 are all located above the push block 6, and the distance from the side of the functional module away from the lifting box 3 to the surface of the lifting box 3 is smaller than the distance from the side of the second magnet 52 away from the lifting box 3 to the lifting box 3; the side of the push block 6 away from the lifting box 3 is a slope 7, and the distance from the slope 7 to the lifting box 3 decreases in the direction away from the manhole cover. The slope 7 is used to slide and abut against the side of the sliding plate 4 close to the lifting box 3. Specifically, the distance from the end of the slope 7 close to the manhole cover to the lifting box 3 is equal to the distance from the side of the second magnet 52 away from the lifting box 3 to the lifting box 3. In order to facilitate the abutment with the slope 7, the side of the sliding plate 4 close to the lifting box 3 can be designed as a curved surface, and the curved surface is convex toward the direction close to the lifting box 3.

[0032] When the lifting box 3 is in the raised use state, the second magnet 52 abuts against the lower inner wall of the slide groove 12 under the action of gravity. When the sliding plate 4 extends out of the well ring 11 and the first magnet 51 attracts the second magnet 52, the second magnet 52 abuts against the lower inner wall of the slide groove 12, which will drive the lifting box 3 to descend together. Then, the well cover is stepped on to drive the lifting box 3 to continue to descend. The second magnet 52 remains motionless under the abutment of the first magnet 51, and the lifting box 3 descends and slides relative to the second magnet 52, and then the push block The lower end of 6 enters the gap between the sliding plate 4 and the lifting box 3. As the lifting box 3 continues to descend, the inclined surface 7 of the push block 6 will abut the sliding plate 4 to slide away from the lifting box 3 until the first magnet 51 and the second magnet 52 are disengaged, and the sliding plate 4 retreats to the bottom of the well ring 11 and is misaligned with the second magnet 52. At this time, the second magnet 52 abuts against the inner wall of the lower end of the slide groove 12 again under the action of gravity, and the lifting box 3 can continue to descend and be completely recovered into the well body 1 without the need to operate the sliding plate 4 separately. It is simple and convenient.

[0033] Reference Figure 2 and Figure 3 A cushion layer (not shown in the figure) is bonded to the outer wall of each guide rod 101 of the guide group 10 to increase the friction between the guide rod 101 and the sliding plate 4. The cushion layer can be a rubber layer, a plastic layer, etc. Through the setting of the cushion layer, the sliding plate 4 will not slide easily without external force.

[0034] Reference Figure 2 and Figure 3In order to facilitate the user to push the sliding plate 4 out from under the well ring 11, a foot push plate 8 is slidably penetrated on the sliding plate 4, and the foot push plate 8 is staggered with the push block 6 so that the push block 6 and the foot push plate 8 will not interfere with each other. The sliding direction of the foot push plate 8 is parallel to the lifting direction of the lifting frame 2. The foot push plate 8 is I-shaped, so that the foot push plate 8 will not be separated from the sliding plate 4. The foot push plate 8 is aligned with the wellhead of the well body 1. Specifically, when the sliding plate 4 is in the initial state, the foot push plate 8 is aligned with the opening of the well ring 11. The number of foot push plates 8 on each sliding plate 4 is set according to needs, and the lifting box 3 is provided with an abutment for pushing the foot push plate 8 to move toward the outside of the well body 1.

[0035] Reference Figure 2 and Figure 3 In order to facilitate the movement of the foot push plate 8 toward the outside of the well body 1, the abutment member includes an abutment plate 9 fixedly arranged on the lifting box 3, the abutment plate 9 corresponds to the foot push plate 8 one by one, the abutment plate 9 is located below the corresponding foot push plate 8, and the abutment plate 9 extends in the horizontal direction toward the direction close to the corresponding side sliding plate 4. The abutment plate 9 is used to push the foot push plate 8 to move toward the outside of the well body 1.

[0036] When the lifting box 3 rises, the lifting of the lifting box 3 drives the abutment plate 9 to move synchronously, and the functional modules on the lifting box 3 gradually move out of the well body 1, and then the abutment plate 9 on the lifting box 3 abuts the corresponding foot push plate 8 until the lifting box 3 moves to the highest position, and the abutment plate 9 pushes the corresponding foot push plate 8 out of the well body 1, so that it is convenient for the user to push the foot push plate 8 with his feet to drive the sliding plate 4 to slide in the direction close to the lifting box 3, which is labor-saving and convenient; when the lifting box 3 descends, the abutment plate 9 descends together, and the abutment force of the abutment plate 9 on the foot push plate 8 is reduced, and then the foot push plate 8 moves downward under the action of gravity and is retracted into the well body 1, so that it is convenient to switch the foot push plate 8 between the use and non-use states.

[0037] The implementation principle of the embodiment of the present application is: when the lifting box 3 is located in the well body 1, the sliding plate 4 is in the initial state. At this time, the second magnet 52 abuts against the inner wall of the lower end of the slide groove 12 under the action of gravity, and the upper end of the foot push plate 8 abuts against the upper surface of the sliding plate 4 under the action of gravity.

[0038] When the lifting box 3 is needed, the lifting frame 2 drives the lifting box 3 to gradually extend out of the well body 1, and then the abutment plate 9 on the lifting box 3 pushes the corresponding foot push plate 8 upward, so that the foot push plate 8 extends out of the well body 1 until the lifting frame 2 moves to the highest point. Since the sliding plate 4 and the second magnet 52 are misaligned, the second magnet 52 and the push block 6 will not interfere with the sliding plate 4.

[0039] When the lifting box 3 is used up, the foot push plate 8 on either side is pushed by the foot to drive the sliding plate 4 to slide in the direction close to the lifting box 3. The sliding plate 4 drives the first magnet 51 to move to the bottom of the corresponding second magnet 52. Then the first magnet 51 absorbs the second magnet 52 and drives the lifting box 3 to slide a certain distance in the direction close to the well body 1. Since the position of the manhole cover on the lifting box 3 is lowered at this time, it is convenient for the operator to step on the manhole cover to continue to push the lifting box 3 into the well body 1, realizing labor-saving operation.

[0040] Then, the manhole cover or lifting box 3 whose height has been lowered by stepping on the foot continues to move downward under the inertia of the groove wheel in the counterweight assembly, and the second magnet 52 remains stationary under the abutment of the first magnet 51. The lifting box 3 descends and slides relatively with the second magnet 52. Then the lower end of the push block 6 enters between the sliding plate 4 and the lifting box 3. As the lifting box 3 continues to descend, the inclined surface 7 of the push block 6 will abut the sliding plate 4 and slide away from the lifting box 3 until the sliding plate 4 is pushed back to the bottom of the well ring 11. The first magnet 51 is disengaged from the second magnet 52, and the second magnet 52 is disengaged from the sliding plate 4. Under the action of gravity, the second magnet 52 abuts against the inner wall of the lower end of the slide groove 12 again. At this time, the lifting box 3 can continue to descend and be completely recovered into the well body 1, and finally the manhole cover can be locked.

[0041] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A purely mechanical counterweight lifting shaft for aviation service, comprising a shaft body (1), a lifting frame (2) slidably arranged in the shaft body (1), and a lifting box (3) arranged on the lifting frame (2), characterized in that: The cross-sectional area of ​​the lifting box (3) is smaller than the cross-sectional area of ​​the wellhead of the well body (1); a sliding plate (4) is slidably arranged in the well body (1); the sliding direction of the sliding plate (4) is perpendicular to the sliding direction of the lifting frame (2); and an adsorption member (5) is arranged on the sliding plate (4) for adsorbing the lifting box (3) to slide in a direction close to the well body (1).

2. The purely mechanical counterweight lifting shaft for aviation services according to claim 1, characterized in that: The adsorption member (5) comprises a first magnet (51) arranged on the sliding plate (4) and a second magnet (52) arranged on the lifting box (3); the first magnet (51) is used to adsorb the second magnet (52) to drive the lifting box (3) to slide in a direction close to the well body (1); when the lifting box (3) extends out of the well body (1), the second magnet (52) is located above the first magnet (51).

3. A purely mechanical counterweight lifting shaft for aviation services according to claim 2, characterized in that: When the first magnet (51) and the second magnet (52) are adsorbed and matched, the distance from the manhole cover on the lifting box (3) to the wellhead of the well body (1) is less than 50 cm.

4. The purely mechanical counterweight lifting shaft for aviation services according to claim 2 is characterized in that: The second magnet (52) is slidably arranged on the lifting box (3), and the sliding direction of the second magnet (52) is parallel to the sliding direction of the lifting frame (2). The lifting box (3) is provided with a pushing member, and the pushing member is used to push the sliding plate (4) to slide in a direction away from the lifting box (3) when the lifting box (3) descends.

5. The purely mechanical counterweight lifting shaft for aviation services according to claim 4 is characterized in that: The pushing member comprises a pushing block (6) arranged on the lifting box (3); a side of the pushing block (6) away from the lifting box (3) is an inclined surface (7); the distance between the inclined surface (7) and the lifting box (3) decreases in a direction away from the manhole cover; the inclined surface (7) is used for slidingly contacting with a side of the sliding plate (4) close to the lifting box (3).

6. The purely mechanical counterweight lifting shaft for aviation services according to claim 5, characterized in that: A foot push plate (8) is slidably provided on the sliding plate (4), the sliding direction of the foot push plate (8) is parallel to the sliding direction of the lifting frame (2), the foot push plate (8) is aligned with the wellhead of the well body (1), and the lifting box (3) is provided with an abutment member for pushing the foot push plate (8) to move toward the outside of the well body (1).

7. A purely mechanical counterweight lifting shaft for aviation services according to claim 6, characterized in that: The abutment member comprises an abutment plate (9) arranged on the lifting box (3), the abutment plate (9) being located below the foot push plate (8), and the abutment plate (9) being used to push the foot push plate (8) to move toward the outside of the well body (1).

8. The purely mechanical counterweight lifting shaft for aviation services according to claim 7 is characterized in that: Two sliding plates (4) are arranged opposite to each other along the axis of the well body (1); the lifting box (3) is located between the two sliding plates (4); the second magnet (52) corresponds one-to-one to the first magnet (51) on the sliding plate (4); and the abutment plate (9) corresponds one-to-one to the foot push plate (8) on the sliding plate (4).

9. The purely mechanical counterweight lifting shaft for aviation services according to claim 6, characterized in that: The foot push plate (8) and the push block (6) are arranged in a staggered manner.

10. A purely mechanical counterweight lifting shaft for aviation services according to any one of claims 1 to 9, characterized in that: A guide group (10) is arranged in the well body (1), and the guide group (10) comprises a plurality of guide rods (101) arranged in the well body (1), the sliding plate (4) is slidably sleeved on the plurality of guide rods (101), and a cushion layer for increasing the friction between the guide rods (101) and the sliding plate (4) is arranged on the guide rods (101).

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