A bridge construction hoisting structure

Abstract

The present application relates to the technical field of hoisting equipment, and in particular to a bridge construction hoisting structure, which includes a lifting platform and a support seat, a lifting rope is installed on the lifting platform, and the left and right sides of the lifting platform are rotatably connected with a connecting frame, and the connecting frame is provided with an elastic clip; the connecting frame and the lifting platform are commonly connected with a torsion spring, and the support seat is provided with a slot; the left and right sides of the support seat are provided with a material guide seat, and the material guide seat is connected to a material guide plate through a first elastic telescopic rod, and the material guide plate is provided with a pressure rod. When the worker pushes the pipe to the support seat through the material guide seat, the pipe will press down the material guide plate, and the material guide plate will push the elastic clip out of the slot through the pressure rod, so that the pipe can push the connecting frame to flip upward, so that the pipe can move from the left and right sides of the support seat to the support seat; then the torsion spring will prompt the connecting frame to flip down and reset, so that the lifting platform is reconnected to the support seat through the connecting frame. The present application can realize the rapid lifting of pipes and ensure the stability of pipes during the lifting process.

Description

Technical Field

[0001] The present application relates to the technical field of hoisting equipment, and in particular to a hoisting structure for bridge construction. Background Art

[0002] During the bridge construction process, long pipes are needed for drainage operations. Due to their own weight and length, long pipes usually need to be lifted using lifting equipment.

[0003] At present, there are two ways to lift pipes. One way is to bundle multiple pipes together, and then lift the bundled pipes by a hook. This method is convenient and fast, but since the pipes are not rigidly supported, their stability is poor and there are safety hazards. The other way is to bundle multiple pipes together, and then place the bundled pipes on a hanging platform, and then lift the hanging platform by a lifting rope. This method has better stability, but since the length of the pipe is usually greater than the length of the hanging platform, and lifting ropes are installed at the four corners of the hanging platform, the pipe cannot be placed directly on the hanging platform from the left and right sides of the hanging platform, that is, the pipe and the hanging platform must first keep the length direction consistent, and the pipe can be moved to the hanging platform along its own length direction. The movement of the pipe requires workers to carry it manually, which is labor-intensive and not conducive to the rapid lifting of the pipe, so it needs to be improved. Summary of the invention

[0004] In order to achieve rapid lifting of pipes and ensure the stability of the pipes during the lifting process, the present application provides a bridge construction lifting structure.

[0005] The present application provides a bridge construction hoisting structure, which adopts the following technical solution: a bridge construction hoisting structure, comprising a hanging platform and a support seat arranged in an upper and lower interval, a hanging rope is installed on the hanging platform, and connecting frames are rotatably connected to the left and right sides of the hanging platform, the connecting frames can be turned over in a vertical plane, and elastic clamps are provided on the connecting frames;

[0006] The connecting frame and the hanging platform are connected with a torsion spring, and a card slot is provided on the support seat. When the torsion spring is in a natural state, the elastic card will be in a natural state and be clamped in the card slot, and the support seat and the hanging platform will be relatively fixed at this time;

[0007] A material guide seat is provided on both the left and right sides of the support seat, and the height of the upper surface of the material guide seat gradually decreases from the end close to the support seat to the end far away from the support seat;

[0008] The material guide seat is connected to a material guide plate through a first elastic telescopic rod, and a pressure rod is provided on the material guide plate. When the first elastic telescopic rod is in a natural state, the upper surface of the material guide plate will be higher than the upper surface of the material guide seat; when the material guide plate is pressed down until its upper surface is flush with the upper surface of the material guide seat, the material guide plate will push the elastic clip out of the slot through the pressure rod.

[0009] Optionally, the material guide seat is provided with a receiving groove, the first elastic telescopic rod is arranged in the receiving groove, the material guide plate is slidably embedded in the receiving groove, and a downwardly inclined extension plate is provided at the lower end of the material guide plate;

[0010] When the first elastic telescopic rod is in a natural state, the lower end of the extension plate will sink into the accommodating groove.

[0011] Optionally, a cavity is provided at the bottom of the support seat, and a plurality of suction cups are provided in the cavity; when the suction cups are in a natural state, the lower ends of the suction cups will be lower than the lower surfaces of the support seat and the material guide seat.

[0012] Optionally, the upper end of the suction cup is connected to the support seat via a fixing tube, the fixing tube is connected to a sliding rod via a first spring, and the sliding rod slides in a vertical direction and penetrates the support seat;

[0013] A pressing plate is provided at the upper end of the slide rod, and the left and right sides of the pressing plate are bent downward to form a material guide area. A sealing column is provided at the lower end of the slide rod, and the diameter of the sealing column gradually decreases from bottom to top, and the sealing column is slidably embedded in the upper end opening of the suction cup, and the side of the suction cup is provided with an air hole connected to the upper end opening of the suction cup;

[0014] When the first spring is in a natural state, the pressure plate will be located above the support seat, and the sealing column will seal the upper end opening of the suction cup;

[0015] When the pressing plate is pressed down onto the supporting seat, a gap will be generated between the side wall of the sealing column and the upper end opening of the suction cup, and the air hole will be connected to the lower end opening of the suction cup through the gap.

[0016] Optionally, a storage groove is provided on the upper surface of the support seat, and the pressure plate can sink into the storage groove.

[0017] Optionally, the material guiding seat is rotatably connected to the supporting seat via a horizontal axis, and a material pressing area is provided above the supporting seat for pressing the material guiding seat against the pipe.

[0018] Optionally, the horizontal shaft is coaxially connected with a matching gear, a gear set is meshed on the matching gear, the gear set is mounted on the support seat, and a rack is meshed on the gear set, the rack is connected to the support seat through a second elastic telescopic rod, and the rack and the second elastic telescopic rod are both vertically arranged;

[0019] When the second elastic telescopic rod is in a natural state, the lower end of the rack will be located below the support seat, and the material guide seat will be located in the material pressing area;

[0020] When the rack is pushed up until its lower end surface is flush with the lower surface of the support seat, the material guide seat will flip to a horizontal state, and the lower surface of the material guide seat will be flush with the lower surface of the support seat.

[0021] Optionally, a slide groove is provided on the connecting frame, and the elastic clamping member includes a clamping rod slidably embedded in the slide groove, and the clamping rod is connected to the connecting frame through a second spring; when the torsion spring and the second spring are both in a natural state, the clamping rod will be clamped in the clamping groove.

[0022] In summary, this application includes the following beneficial technical effects:

[0023] 1. Before the pipe is loaded, the upper surface of the guide plate will be higher than the upper surface of the guide seat, and the lower end of the extension plate will sink into the receiving groove, so that the pipe on the guide seat can move to the guide plate through the extension plate; then the pipe will press the guide plate downward so that the upper surface of the guide plate is flush with the upper surface of the guide seat. At this time, the pipe will continue to move toward the support seat, and the guide plate will push the clamping rod out of the clamping groove through the pressure rod, so that the pipe on the guide seat can push the connecting frame to flip upward, so that the pipe can be quickly loaded onto the support seat from the left and right sides of the support seat; when the pipe is loaded onto the pressure plate, the pipe will be separated from the connecting frame, and the torsion spring will return to its natural state, so that the connecting frame flips downward to a vertical state, and the second spring will prompt the clamping rod to be re-connected to the clamping groove, so that the crane can quickly lift the pipe through the lifting platform and the support seat;

[0024] 2. When the support base is placed on the ground, the suction cup will be sucked tightly on the ground, and the material guide base will be supported on the ground, which improves the stability of the support base during the pipe feeding process;

[0025] 3. During the lifting process of the lifting platform and the support seat, the second elastic telescopic rod will be in a natural state, the lower end of the rack will be located below the support seat, and the material guide seat will be in the material pressing area. At this time, the material guide seat will press the pipe placed on the upper surface of the support seat, thereby improving the stability of the pipe during the lifting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0027] Figure 2 It is a structural schematic diagram of the bottom of the hanging platform and the support base of the embodiment of the present application;

[0028] Figure 3 It is a schematic diagram of the structure of the pressing plate and the supporting seat of the embodiment of the present application;

[0029] Figure 4 is a schematic cross-sectional structural diagram of a concave cavity in an embodiment of the present application;

[0030] Figure 5 It is a schematic cross-sectional view of the support base and the suction cup of the present application embodiment;

[0031] Figure 6 is a schematic cross-sectional structural diagram of a suction cup according to an embodiment of the present application;

[0032] Figure 7 This is a schematic diagram of the structure of the material guide seat after being flipped downwards in the embodiment of the present application;

[0033] Figure 8 yes Figure 7 A local enlarged schematic diagram of the middle A;

[0034] Fig. 9 It is a schematic cross-sectional structural diagram of the support seat and the material guide seat of the embodiment of the present application;

[0035] Fig.10 It is a schematic diagram of the cross-sectional structure of the material guide seat according to the embodiment of the present application.

[0036] 1. Hanging platform; 11. Hanging rope; 2. Support seat; 21. Slot; 22. Concave cavity; 23. Suction cup; 231. Air hole; 24. Fixing tube; 241. First spring; 242. Slide rod; 25. Pressing plate; 251. Material guiding area; 26. Sealing column; 27. Storage groove; 28. Material pressing area; 3. Connecting frame; 31. Torsion spring; 32. Slide groove; 33. Elastic clip; 331. Clamping rod; 332. Second spring; 4. Material guiding seat; 41. Horizontal axis; 42. Matching gear; 43. Gear set; 44. Rack; 45. Second elastic telescopic rod; 46. Accommodating groove; 47. First elastic telescopic rod; 48. Material guiding plate; 481. Extension plate; 49. Pressing rod. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-10 This application is described in further detail.

[0038] The present application embodiment discloses a bridge construction hoisting structure. Figure 1 As shown, a bridge construction hoisting structure includes a hanging platform 1 and a supporting seat 2 arranged at an interval up and down, and hanging ropes 11 are installed at the four corners of the upper surface of the hanging platform 1. The end of the hanging rope 11 away from the hanging platform 1 is connected to the boom of the crane.

[0039] like Figures 2 to 4 As shown, the left and right sides of the lower surface of the hanging platform 1 are rotatably connected with a connecting frame 3, the connecting frame 3 is arranged in a "door" shape and can be flipped on the vertical plane, the connecting frame 3 and the hanging platform 1 are commonly connected with a torsion spring 31, and the front and rear ends of the connecting frame 3 are provided with a slide groove 32, and the slide groove 32 is provided with an elastic clip 33, the elastic clip 33 includes a clip rod 331 slidably embedded in the slide groove 32, and one end of the clip rod 331 embedded in the slide groove 32 is connected to the connecting frame 3 through a second spring 332.

[0040] A card slot 21 is provided on the support seat 2. During the lifting process of the hanging platform 1, the torsion spring 31 will be in a natural state, the connecting frame 3 will be in a vertical state, the second spring 332 will also be in a natural state, and the card rod 331 will be connected in the card slot 21, so that the support seat 2 and the hanging platform 1 are relatively fixed to ensure that the pipes placed on the upper surface of the support seat 2 can move synchronously with the hanging platform 1.

[0041] like Figure 4 and Figure 5 As shown, a concave cavity 22 is provided at the bottom of the support base 2, and a plurality of suction cups 23 are provided in the concave cavity 22. The upper ends of the suction cups 23 are connected to the support base 2 through fixing tubes 24. During the lifting process of the support base 2, the suction cups 23 will be in a natural state, and the lower ends of the suction cups 23 will be lower than the lower surface of the support base 2; when the support base 2 is placed on the ground, the lower ends of the suction cups 23 will be squeezed and deformed by the ground, and the suction cups 23 will be sucked tightly on the ground, thereby improving the stability of the support base 2 during the pipe loading process.

[0042] like Figure 1 As shown, the interior of the fixed cylinder 24 is connected to a slide rod 242 through a first spring 241, the fixed cylinder 24, the first spring 241 and the slide rod 242 are all vertically arranged, and the slide rod 242 slides in the vertical direction and penetrates the interior of the fixed cylinder 24 and the support seat 2; the upper ends of all the slide rods 242 are commonly connected to the same pressing plate 25, and the left and right sides of the pressing plate 25 are inclined and bent downward to form a material guide area 251; a sealing column 26 is installed at the lower end of the slide rod 242, the diameter of the sealing column 26 gradually decreases from bottom to top, and the sealing column 26 is slidably embedded in the upper end opening of the suction cup 23, and the side of the suction cup 23 is provided with an air hole 231 connected to the upper end opening of the suction cup 23.

[0043] When the pipe is not loaded onto the support seat 2, the pipe will not be pressed against the pressure plate 25. At this time, the first spring 241 will be in a natural state, the pressure plate 25 will be located above the support seat 2, and the sealing column 26 will seal the upper end opening of the suction cup 23, so that the suction cup 23 can be sucked on the ground.

[0044] When the pipe on the upper surface of the support seat 2 is fed to the upper surface of the pressing plate 25 through the guide area 251, the pipe will press the pressing plate 25 down onto the support seat 2, the first spring 241 will be compressed, and the pressing plate 25 will drive the sealing column 26 to slide down through the sliding rod 242, so that a gap is generated between the side wall of the sealing column 26 and the upper end opening of the suction cup 23, and the air hole 231 will be connected to the lower end opening of the suction cup 23 through the gap, so that external air can enter the suction cup 23 through the air hole 231 and the gap, so that the support seat 2 can be detached from the ground, which facilitates the crane to lift the platform 1 and the support seat 2.

[0045] It is worth mentioning that a storage groove 27 is provided on the upper surface of the support seat 2. When the pipe presses down the pressure plate 25, the pressure plate 25 can sink into the storage groove 27, so that the pipe can be placed on the upper surface of the pressure plate 25 and the upper surface of the support seat 2 at the same time, thereby improving the support effect on the pipe.

[0046] like Figure 7 and Figure 8 As shown, a material pressing area 28 is provided above the support seat 2, and the left and right sides of the support seat 2 are rotatably connected to the material guide seat 4 through a horizontal axis 41, and the horizontal axis 41 is coaxially connected to a matching gear 42, and a gear set 43 is meshed on the matching gear 42. The gear set 43 is installed on the support seat 2, and a rack 44 is meshed on the gear set 43. The rack 44 is connected to the support seat 2 through a second elastic telescopic rod 45, and the rack 44 and the second elastic telescopic rod 45 are both vertically arranged.

[0047] During the lifting process of the lifting platform 1 and the support seat 2, the second elastic telescopic rod 45 will be in a natural state, the lower end of the rack 44 will be located below the support seat 2, and the material guide seat 4 will be in the material pressing area 28. The pipe on the support seat 2 will squeeze the material guide seat 4 due to its own volume, causing the second elastic telescopic rod 45 to deform. The material guide seat 4 will press the pipe placed on the upper surface of the support seat 2, thereby improving the stability of the pipe during the lifting process and realizing the storage of the material guide seat 4, so that the present application is not easy to collide with external objects during the lifting process.

[0048] When the support seat 2 is placed on the ground, the lower end of the rack 44 is pushed up by the ground until the lower end surface of the rack 44 is flush with the lower surface of the support seat 2, and the rack 44 will drive the matching gear 42 to rotate through the gear set 43, and the matching gear 42 will drive the support seat 2 to flip downward to a horizontal state through the horizontal axis 41. At this time, the lower surface of the material guide seat 4 will be flush with the lower surface of the support seat 2, that is, the material guide seat 4 will also be supported on the ground, further improving the stability of the support seat 2 during the pipe loading process; at the same time, the height of the upper surface of the material guide seat 4 gradually decreases from the end close to the support seat 2 to the end away from the support seat 2, so that workers can push the bundles of pipes placed on the ground to the support seat 2 through the material guide seat 4.

[0049] like Fig. 9 and Fig.10 As shown, a receiving groove 46 is provided on the upper surface of the material guide seat 4, and a material guide plate 48 is connected to the receiving groove 46 through multiple first elastic telescopic rods 47. The inclination direction of the material guide plate 48 is consistent with the inclination direction of the upper surface of the material guide seat 4. A downwardly inclined extension plate 481 is installed at the lower end of the material guide plate 48, and multiple pressure rods 49 are installed at the high end of the material guide plate 48.

[0050] Before the pipe is loaded, the first elastic telescopic rod 47 will be in a natural state, at which time the upper surface of the guide plate 48 will be higher than the upper surface of the guide seat 4, and the lower end of the extension plate 481 will sink into the receiving groove 46, so that the pipe on the guide seat 4 can move to the guide plate 48 through the extension plate 481; then the pipe will press the guide plate 48 downward so that the upper surface of the guide plate 48 is flush with the upper surface of the guide seat 4, and at this time the pipe will continue to move toward the support seat 2, and the guide plate 48 will push the card through the pressure rod 49 The rod 331 is disengaged from the slot 21, so that the pipe on the guide seat 4 can push the connecting frame 3 to flip upward, so that the pipe can be quickly loaded onto the support seat 2 from the left and right sides of the support seat 2; when the pipe is loaded onto the pressure plate 25, the pipe will be disengaged from the connecting frame 3, and the torsion spring 31 will return to its natural state, so that the connecting frame 3 flips downward to a vertical state, and the second spring 332 will prompt the locking rod 331 to be re-engaged in the slot 21, so that the crane can quickly lift the pipe through the lifting platform 1 and the support seat 2.

[0051] The implementation principle of a bridge construction lifting structure in an embodiment of the present application is as follows: when the pipe needs to be lifted, the crane will unwind the lifting rope 11 so that the support seat 2 is supported on the ground. At this time, the suction cup 23 will be sucked tightly on the ground, so that the support seat 2 remains stable; the lower end of the rack 44 will be pushed up by the ground, and the rack 44 will drive the matching gear 42 to rotate through the gear set 43, and the matching gear 42 will make the guide seat 4 flip downward and fit the ground through the horizontal axis 41, further improving the stability of the support seat 2; at this time, the worker can push the bundled pipes on the ground onto the guide seat 4, and the pipes on the guide seat 4 will move to the guide plate 48 through the extension plate 481, and the guide plate 48 will sink into the accommodating groove 46 and push the clamping rod 331 out of the clamping groove 21 through the pressure rod 49, so that the pipes on the guide plate 48 can push the connecting frame 3 to flip upward, so that the pipes can be quickly loaded onto the support seat 2 from the left and right sides of the support seat 2.

[0052] Subsequently, the pipe on the support seat 2 will move to the upper surface of the pressure plate 25 through the material guide area 251, and the pressure plate 25 will sink into the storage groove 27 and drive the sealing column 26 to descend through the sliding rod 242, and the external air will pass through the air hole 231 and enter the suction cup 23 through the gap between the sealing column 26 and the upper end opening of the suction cup 23, so that the suction cup 23 will be detached from the ground; at the same time, the pipe will be detached from the connecting frame 3, and the torsion spring 31 will return to its natural state, so that the connecting frame 3 will flip downward to a vertical state, and the second spring 332 will prompt the clamping rod 331 to be re-connected in the clamping groove 21, so that the lifting platform 1 and the support seat 2 are reconnected, so that the crane can lift the support seat 2 and the pipe through the lifting rope 11 and the lifting platform 1.

[0053] Then the second elastic telescopic rod 45 will return to its natural state, causing the rack 44 to descend, and the rack 44 will drive the matching gear 42 to rotate through the gear set 43. The matching gear 42 will cause the material guide seat 4 to flip upward to the pressing area 28 through the horizontal axis 41. The two material guide seats 4 will jointly tilt downward to press the pipe on the pressing plate 25 to improve the stability of the pipe during the lifting process.

[0054] In summary, the pipe can be quickly loaded onto the support seat 2 from the left or right side of the support seat 2, realizing the rapid lifting of the pipe, and the pipe will be automatically pressed and fixed after loading is completed, ensuring the stability of the pipe during the lifting process.

[0055] 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 bridge construction hoisting structure, characterized in that: The invention comprises a hanging platform (1) and a supporting seat (2) which are arranged at an interval up and down, a hanging rope (11) being installed on the hanging platform (1), and connecting frames (3) being rotatably connected on both left and right sides of the hanging platform (1), the connecting frame (3) being capable of turning over on a vertical plane, and an elastic clamping piece (33) being provided on the connecting frame (3); The connecting frame (3) and the hanging platform (1) are connected together by a torsion spring (31), and a clamping slot (21) is provided on the support seat (2). When the torsion spring (31) is in a natural state, the elastic clamping member (33) is in a natural state and clamped in the clamping slot (21). At this time, the support seat (2) and the hanging platform (1) are relatively fixed, and the connecting frame (3) is in a vertical state. A material guide seat (4) is provided on both the left and right sides of the support seat (2), and the height of the upper surface of the material guide seat (4) gradually decreases from the end close to the support seat (2) to the end far from the support seat (2); The material guide seat (4) is connected to a material guide plate (48) via a first elastic telescopic rod (47), and a pressure rod (49) is provided on the material guide plate (48). When the first elastic telescopic rod (47) is in a natural state, the upper surface of the material guide plate (48) will be higher than the upper surface of the material guide seat (4); when the material guide plate (48) is pressed down until its upper surface is flush with the upper surface of the material guide seat (4), the material guide plate (48) will push the elastic clamp (33) out of the clamping groove (21) via the pressure rod (49), so that the pipe on the material guide seat (4) pushes the connecting frame (3) to flip upward; The material guide seat (4) is provided with a receiving groove (46), a first elastic telescopic rod (47) is arranged in the receiving groove (46), a material guide plate (48) is slidably embedded in the receiving groove (46), and a downwardly inclined extension plate (481) is provided at the lower end of the material guide plate (48); When the first elastic telescopic rod (47) is in a natural state, the lower end of the extension plate (481) will sink into the accommodating groove (46), so that the pipe on the material guide seat (4) moves to the material guide plate (48) through the extension plate (481).

2. A bridge construction hoisting structure according to claim 1, characterized in that: The bottom of the support seat (2) is provided with a cavity (22), and a plurality of suction cups (23) are provided in the cavity (22); when the suction cups (23) are in a natural state, the lower ends of the suction cups (23) are lower than the lower surfaces of the support seat (2) and the material guide seat (4).

3. A bridge construction hoisting structure according to claim 2, characterized in that: The upper end of the suction cup (23) is connected to the support seat (2) via a fixing tube (24); the fixing tube (24) is connected to a sliding rod (242) via a first spring (241); the sliding rod (242) is slidably disposed in the support seat (2) in a vertical direction; A pressing plate (25) is provided at the upper end of the slide bar (242), and both left and right sides of the pressing plate (25) are bent downwardly to form a material guide area (251). A sealing column (26) is provided at the lower end of the slide bar (242), and the diameter of the sealing column (26) gradually decreases from bottom to top, and the sealing column (26) is slidably embedded in the upper opening of the suction cup (23), and the side of the suction cup (23) is provided with an air hole (231) connected to the upper opening of the suction cup (23); When the first spring (241) is in a natural state, the pressure plate (25) will be located above the support seat (2), and the sealing column (26) will seal the upper end opening of the suction cup (23); When the pressing plate (25) is pressed down onto the supporting seat (2), a gap is generated between the side wall of the sealing column (26) and the upper opening of the suction cup (23), and the air hole (231) is connected to the lower opening of the suction cup (23) through the gap.

4. A bridge construction hoisting structure according to claim 3, characterized in that: The upper surface of the support seat (2) is provided with a receiving groove (27), and the pressing plate (25) can sink into the receiving groove (27).

5. A bridge construction hoisting structure according to any one of claims 1 to 4, characterized in that: The material guide seat (4) is rotatably connected to the support seat (2) via a horizontal shaft (41), and a material pressing area (28) is provided above the support seat (2) for pressing the material guide seat (4) against the pipe.

6. A bridge construction hoisting structure according to claim 5, characterized in that: The horizontal shaft (41) is coaxially connected to a matching gear (42), a gear set (43) is meshed on the matching gear (42), the gear set (43) is mounted on the support seat (2), and a rack (44) is meshed on the gear set (43), the rack (44) is connected to the support seat (2) via a second elastic telescopic rod (45), and the rack (44) and the second elastic telescopic rod (45) are both vertically arranged; When the second elastic telescopic rod (45) is in a natural state, the lower end of the rack (44) will be located below the support seat (2), and the material guide seat (4) will be located in the material pressing area (28); When the rack (44) is pushed up until its lower end surface is flush with the lower surface of the support seat (2), the material guide seat (4) will flip to a horizontal state, and the lower surface of the material guide seat (4) will be flush with the lower surface of the support seat (2).

7. The bridge construction hoisting structure according to claim 1, characterized in that: The connecting frame (3) is provided with a sliding groove (32), and the elastic clamping member (33) comprises a clamping rod (331) slidably embedded in the sliding groove (32), and the clamping rod (331) is connected to the connecting frame (3) via a second spring (332); when the torsion spring (31) and the second spring (332) are both in a natural state, the clamping rod (331) is clamped in the clamping groove (21).

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