Anti-panic descending device

Abstract

The utility model discloses an anti-panic descending device, and belongs to the field of outdoor articles. An anti-panic descending device comprises a movable side plate, a fixed side plate, a handle, a cam, a fixed friction block and a hanging hole fixing block. The fixed friction block and the hanging hole fixing block are fixedly arranged on the outer side walls of the two ends of the fixed side plate correspondingly. The movable side plate is rotationally arranged on the side, away from the fixed side plate, of the fixed friction block. The cam is fixedly arranged on the outer side wall of the fixed side plate between the fixed friction block and the hanging hole fixing block; corresponding wire grooves are formed in the peripheries of the fixed friction blocks and the hanging hole fixing blocks, so that ropes can pass through the wire grooves; the handle is rotationally arranged on the side, away from the cam, of the fixed side plate to control the descending speed of the rope. In this way, the descending speed of the rope is controlled through the handle, and operation is easy and convenient.

Description

Technical Field

[0001] The utility model belongs to the field of outdoor products, and more specifically relates to a device for preventing panic descent. Background Art

[0002] A descending device is a device used to adjust and control the length of a rope. It plays an important role in various application scenarios, such as outdoor sports. With the advancement of technology and the popularity of outdoor sports, higher requirements are placed on the performance, safety and convenience of descending devices.

[0003] In the prior art, a utility model patent with Chinese patent application number "CN201510584717.X" and publication date of 2015-11-18 discloses a controllable lifting protector, including a fixed plate, a movable side plate whose upper end is positioned on the fixed plate by a first pin shaft, a rope winding seat and a rope wheel arranged between the fixed plate and the movable side plate, and the rope wheel is positioned on the fixed plate by a second pin shaft; the movable side plate is provided with a positioning hole corresponding to the position of the second pin shaft, and after the positioning hole coincides with the end of the second pin shaft, the connecting hole at the lower end of the movable side plate is aligned with the fixed plate; the rope winding seat is enclosed outside the first pin shaft, and has a braking surface and a rope winding arc surface, and the braking surface is provided with a rope winding seat. Facing one side of the rope wheel; the cross-section of the rope wheel is an asymmetric polygon, with a wheel surface with more than three rounded edges, and a rope groove is arranged on the wheel surface; when the rope passing around the rope wheel is initially subjected to force, the rope wheel is driven to rotate a small angle, and one of the rounded edges can press the rope against the braking surface of the rope winding seat to stop it; at this time, an angle is opened between the control arm linked to the rope wheel and the fixed plate; in this scheme, with the help of the polygonal rope wheel and the rope winding seat, automatic braking anti-fall safety protection and manual control descent are realized, and the polygonal rope wheel also has the characteristic of slow descent; however, in this way, if the person is in a panic, if the operator holds the control handle too tightly, the descent will continue. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a panic descent prevention device, which can realize the speed control of rope descent and is easy to operate.

[0005] The utility model discloses an anti-panic descent device, comprising a fixed side plate, a handle and a cam; the cam is rotatably arranged on one side of the fixed side plate, and a corresponding wire groove is opened on the outer periphery of the cam for the rope to pass through; the handle is rotatably arranged on the side of the fixed side plate away from the cam, a wedge is rotatably embedded between the handle and the fixed side plate, a protrusion is installed at the end of the cam on the side facing the fixed side plate, the handle and the cam are rotatable through the linkage of the wedge and the protrusion, and the abutment between the wire groove arranged on the cam and the rope moves inward and outward directions with the rotation of the cam, so as to control the descent speed of the rope and prevent the mechanism from getting out of control.

[0006] As a further improvement of the utility model, it also includes a second rotating shaft, and a second spring is sleeved on the outer periphery of one end of the second rotating shaft; a fourth clamping groove, a sliding groove, a fixed groove and a rotating groove are respectively opened on the side of the handle close to the fixed side plate; the rotating groove is opened at one end of the handle; one end of the second rotating shaft passes through the rotating groove and is rotatably connected to the handle; the other end of the second rotating shaft passes through the fixed side plate and is rotatably connected to the fixed side plate; the second spring is arranged between the handle and the fixed side plate;

[0007] The inner diameter of the fourth clamping groove matches the maximum outer diameter of the first limiting column to receive the first limiting column; the first limiting column is used to limit the displacement of the handle.

[0008] As a further improvement of the utility model, the wedge block includes a rotating block, one end of which is fixedly provided with a protrusion; the sliding groove and the fixed groove are adjacent to each other on the same side and are connected through and through, the protrusion of the rotating block is rotatably embedded in the fixed groove, and the rotating block is rotatably provided in the sliding groove and abuts against the inner wall of the sliding groove; the wedge block is used to limit the rotation range of the handle.

[0009] As a further improvement of the utility model, it also includes a movable side plate, a cover and a fixed plate; the movable side plate is rotatably arranged on the side of the fixed friction block away from the fixed side plate; the cover is arranged on the side wall of the movable side plate away from the fixed friction block; the fixed cover is provided with a friction lip on the outer side plate of the cover and the movable side plate to limit the position of the cover and the movable side plate; a fixing hole is opened at one end of the cover away from the friction lip, the fixed plate cover is arranged on the side of the fixing hole away from the movable side plate, and the fixed plate fixes the cover and the movable side plate through a fixing member.

[0010] As a further improvement of the utility model, it also includes a switch, which includes a first switch and a second switch, and the first switch and the second switch are connected as a whole by riveting or screwing; the switch passes through the cover and the movable side plate in sequence, and is installed and connected with the cover and the movable side plate to control the opening and closing of the movable side plate.

[0011] As a further improvement of the utility model, it also includes a fixed friction block and a first rivet; the fixed friction block is fixedly arranged on the side walls at both ends of the fixed side plate; the first rivet includes a first fixed column and a first limiting column, one end of the first fixed column is fixedly connected to one end of the first limiting column, and the maximum outer diameter of the first fixed column is smaller than the maximum outer diameter of the first limiting column; the end of the first fixed column away from the first limiting column sequentially penetrates the fixed side plate and the fixed friction block to fix the fixed side plate and the fixed friction block, and the side where the first limiting column and the first fixed column are connected abuts against the fixed side plate;

[0012] A corresponding wire groove is provided on the outer circumference of the fixed friction block for the rope to pass through.

[0013] As a further improvement of the utility model, it also includes a first rotating shaft, the movable side plate is rotatably connected to the first rotating shaft, and the fixed friction block and the fixed side plate are fixedly connected to the first rotating shaft; the first rotating shaft passes through the fixed side plate, the fixed friction block and the movable side plate in sequence, and first limit plates are fixedly arranged at both ends of the first rotating shaft to limit the fixed side plate, the fixed friction block and the movable side plate on the first rotating shaft.

[0014] As a further improvement of the utility model, a switch groove and a first switch hole are provided on the side of the cover facing the movable side plate; the first switch includes a joystick, and the joystick cover is arranged on the outer side wall of the first switch hole and abuts against the side wall of the cover away from the movable side plate; the second switch includes a linkage rod, and a mounting hole is provided at one end of the linkage rod, and a spring column is fixedly provided on the outer side wall of one end of the mounting hole, and a compression spring is sleeved and installed on the outer periphery of the spring column, and one end of the compression spring away from the spring column abuts against the side wall in the switch groove; the joystick is connected to the mounting hole by rivets or screws, and one side of the linkage rod abuts against the inner wall of the cover; a clamping column is fixedly provided on the side of the linkage rod away from the cover, and the clamping column is provided at the end of the linkage rod away from the mounting hole; a third clamping groove is provided at the movable side plate, and one end of the clamping column away from the cover is embedded in the third clamping groove.

[0015] As a further improvement of the utility model, it also includes a hanging hole fixing block and a second fixed shaft. The hanging hole fixing block is arranged between the movable side plate and the fixed side plate, and is fixedly connected to the fixed side plate through the second fixed shaft. A first boss is arranged at the end of the second fixed shaft away from the fixed side plate; a second slot is opened at the end of the movable side plate away from the fixed friction block, and the opening of the second slot is arranged toward the first boss. The maximum dimension of the inner wall of the second slot matches the first boss so that the second slot is engaged with the first boss.

[0016] As a further improvement of the utility model, it also includes a first fixed shaft, a first spring is sleeved on the outer periphery of the first fixed shaft, the first spring is abutted between the fixed side plate and the cam, the cam is installed and connected to the fixed side plate through the first fixed shaft, second limiting plates are arranged at both ends of the first fixed shaft, one of the second limiting plates is abutted against the outer wall of the fixed side plate, a second boss is fixedly arranged between the other second limiting plate and the first fixed shaft, a first slot is opened on the movable side plate, the opening of the first slot is arranged toward the second boss, the maximum size of the inner wall of the first slot matches the second boss, so that the first slot is clamped with the second boss; a protrusion is arranged at the end of the cam, and the protrusion is slidably arranged on the outer periphery of the fixed side plate.

[0017] Compared with the prior art, the beneficial effect of the utility model is that: in the scheme of the utility model, the handle is installed on the fixed side panel and can rotate freely. A wedge is embedded in the handle and can rotate within a certain range. The handle is operated to make the wedge and the protrusion structure on the cam work together to control the descent speed. When the handle is operated to a certain angle, the wedge in the handle is separated from the protrusion structure on the cam to realize the anti-panic function. After the handle rebounds, the wedge rotates in the groove and can pass over the protrusion on the cam. Operating the handle again can make the rope continue to descend. With this arrangement, the overall operation is simple and easy to use, and the descent speed of the rope can be controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is one of the schematic diagrams of the regulator structure of the utility model;

[0019] Figure 2 This is the second schematic diagram of the regulator structure of the utility model;

[0020] Figure 3 This is one of the schematic diagrams of the explosion structure of the regulator of the utility model;

[0021] Figure 4 This is the second schematic diagram of the explosion structure of the regulator of the utility model;

[0022] Figure 5 This is a schematic diagram of the simulation structure of the regulator of the utility model;

[0023] Figure 6 This is a schematic diagram of the handle structure of the utility model.

[0024] Description of the numbers in the figure:

[0025] 1. Moving side panel; 11. First rotating shaft; 12. First card slot; 13. Second card slot; 14. Third card slot; 2. Fixed side panel; 3. Handle; 31. First rivet; 32. Fourth card slot; 33. Wedge block; 34. Second rotating shaft; 35. Slide slot; 36. Fixed slot; 37. Rotating slot; 4. Cover; 5. Fixed plate; 6. Switch; 61. Compression spring; 7. Cam; 71. Bump; 73. First fixed shaft; 8. Fixed friction block; 9. Hanging hole fixed block; 91. Second fixed shaft; 10. Friction lip. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with the embodiments. The following embodiments are intended to explain the present invention but the present invention is not limited to the following embodiments.

[0027] Specific embodiment 1: Please refer to Figure 1-6An anti-panic descent device comprises a fixed side plate 2, a handle 3 and a cam 7; the cam 7 is rotatably arranged on one side of the fixed side plate 2, and a corresponding wire groove is opened on the outer periphery of the cam 7 for the rope to pass through; the handle 3 is rotatably arranged on the side of the fixed side plate 2 away from the cam 7, a wedge block 33 is rotatably embedded between the handle 3 and the fixed side plate 2, and a protrusion 71 is installed at the end of the cam 7 on the side facing the fixed side plate 2, the handle 3 and the cam 7 are rotatable through the wedge block 33 and the protrusion 71, and the wire groove arranged on the cam 7 and the abutment of the rope move inward and outward directions with the rotation of the cam 7 to control the descent speed of the rope and prevent the mechanism from getting out of control.

[0028] The descending device also includes a second rotating shaft 34, and a second spring is sleeved on the outer periphery of one end portion of the second rotating shaft 34; a fourth slot 32, a sliding slot 35, a fixed slot 36 and a rotating slot 37 are respectively provided on the side of the handle 3 close to the fixed side plate 2; the rotating slot 37 is opened at one end of the handle 3; one end of the second rotating shaft 34 passes through the rotating slot 37 and is rotatably connected to the handle 3; the other end of the second rotating shaft 34 passes through the fixed side plate 2 and is rotatably connected to the fixed side plate 2; the second spring is arranged between the handle 3 and the fixed side plate 2.

[0029] The wedge block 33 includes a rotating block, one end of which is fixedly provided with a protrusion; the slide groove 35 and the fixed groove 36 are adjacent to each other on the same side and are connected through and through, the protrusion of the rotating block is rotatably embedded in the fixed groove 36, and the rotating block is rotatably provided in the slide groove 35 and abuts against the inner wall of the slide groove 35; the wedge block 33 is used to limit the rotation range of the handle.

[0030] The inner diameter of the fourth clamping groove 32 matches the maximum outer diameter of the first limiting column to receive the first limiting column; the first limiting column is used to limit the displacement of the handle 3.

[0031] The descending device also includes a movable side plate 1, a cover 4 and a fixed plate; the movable side plate 1 is rotatably arranged on the side of the fixed friction block 8 away from the fixed side plate 2; the cover 4 is covered on the side wall of the movable side plate 1 away from the fixed friction block 8; the fixed cover on the outer peripheral side plate of the cover 4 and the movable side plate 1 is provided with a friction lip 10 to limit the position of the cover and the movable side plate 1; a fixing hole is opened at one end of the cover away from the friction lip 10, and the fixed plate cover is arranged on the side of the fixing hole away from the movable side plate 1, and the fixed plate fixes the cover 4 and the movable side plate 1 through a fixing member.

[0032] Optionally, the fixing member is a rivet, and corresponding rivet holes are provided on the fixed plate and the movable side plate to match the fixing holes on the fixed plate.

[0033] The descending device also includes a hanging hole fixing block 9 and a fixed friction block 8, and the hanging hole fixing block 9, the fixed friction block 8 and the cam 7 are arranged between the fixed side plate 2 and the movable side plate 1; the fixed friction block 8 and the hanging hole fixing block 9 are respectively fixed on the side walls at both ends of the fixed side plate 2; the cam 7 is rotatably arranged on the side wall of the fixed side plate 2 between the fixed friction block 8 and the hanging hole fixing block 9 facing the movable side wall 1; the outer periphery of the fixed friction block 8 is provided with a corresponding wire groove for the rope to pass through.

[0034] The descending device also includes a first rivet 31, which includes a first fixed column and a first limiting column. One end of the first fixed column is fixedly connected to one end of the first limiting column, and the maximum outer diameter of the first fixed column is smaller than the maximum outer diameter of the first limiting column; the end of the first fixed column away from the first limiting column sequentially penetrates the fixed side plate 2 and the fixed friction block 8 to fix the fixed side plate 2 and the fixed friction block 8, and the side where the first limiting column and the first fixed column are connected abuts against the fixed side plate 2.

[0035] The descending device also includes a first rotating shaft 11, the movable side plate 1 is rotatably connected to the first rotating shaft 11, and the fixed friction block 8 and the fixed side plate 2 are fixedly connected to the first rotating shaft 11; the first rotating shaft 11 passes through the fixed side plate 2, the fixed friction block 8 and the movable side plate 1 in sequence, and first limit plates are fixedly provided at both ends of the first rotating shaft 11 to limit the fixed side plate 2, the fixed friction block 8 and the movable side plate 1 on the first rotating shaft 11.

[0036] The descending device also includes a switch 6, which includes a first switch and a second switch, and the first switch and the second switch are connected as a whole by riveting or screwing; the switch 6 sequentially penetrates the cover 4 and the movable side panel 1, and is installed and linked with the cover 4 and the movable side panel 1 to control the opening and closing of the movable side panel 1.

[0037] A switch slot and a first switch hole are provided on the side of the cover 4 facing the movable side plate 1; the first switch includes a joystick, which is covered on the outer side wall of the first switch hole and abuts against the side wall of the cover 4 away from the movable side plate 1; the second switch includes a linkage rod, one end of which is penetrated by a mounting hole, a spring column is fixedly provided on the outer side wall of one end of the mounting hole, a compression spring 61 is sleeved and installed on the outer periphery of the spring column, and the end of the compression spring 61 away from the spring column abuts against the side wall in the switch slot; the joystick is installed and connected to the mounting hole by rivets or screws, and one side of the linkage rod abuts against the inner wall of the cover 4; a clamping column is fixedly provided on the side of the linkage rod away from the cover 4, and the clamping column is provided at the end of the linkage rod away from the mounting hole; a third clamping slot 14 is penetrated by the movable side plate 1, and the end of the clamping column away from the cover 4 is embedded in the third clamping slot 14.

[0038] The descending device also includes a second fixed shaft 91, and the hanging hole fixing block 9 is arranged between the movable side plate 1 and the fixed side plate 2, and is fixedly connected to the fixed side plate 2 through the arranged second fixed shaft 91, and a first boss is arranged at the end of the second fixed shaft 91 away from the fixed side plate 2; a second card groove 13 is opened at the end of the movable side plate 1 away from the fixed friction block 8, and the opening of the second card groove 13 is arranged toward the first boss, and the maximum size of the inner wall of the second card groove 13 matches the first boss so that the second card groove 13 can be engaged with the first boss.

[0039] The outer diameter of the first boss is larger than the outer diameter of the second fixed shaft 91 .

[0040] The descending device also includes a first fixed shaft 73, the outer periphery of which is sleeved with a first spring, the first spring abuts between the fixed side plate 2 and the cam 7, the cam 7 is installed and connected to the fixed side plate 2 through the first fixed shaft 73, and second limiting plates are provided at both ends of the first fixed shaft 73, one of the second limiting plates abuts against the outer wall of the fixed side plate 2, and a second boss is fixedly provided between the other second limiting plate and the first fixed shaft 73, a first slot 12 is provided on the movable side plate 1, the opening of the first slot 12 is arranged toward the second boss, and the maximum size of the inner wall of the first slot 12 matches the second boss so that the first slot 12 is engaged with the second boss; a protrusion 71 is provided at the end of the cam 7, and the protrusion 71 is slidably provided on the outer periphery of the fixed side plate 2.

[0041] The outer diameter of the second boss is larger than the outer diameter of the first fixed shaft 73 .

[0042] Optionally, the protrusion 71 and the cam 7 may be integrally formed, or may be detachably connected. If detachably connected, the protrusion 71 and the cam 7 are riveted together.

[0043] The above is only a preferred specific implementation method of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed in the present application according to the technical solution and improved ideas of the present application, which should be covered by the protection scope of the present application.

Claims

1. A panic descent prevention device, characterized in that: The invention comprises a fixed side plate (2), a handle (3) and a cam (7); the cam (7) is rotatably arranged on one side of the fixed side plate (2), and a corresponding wire groove is provided on the outer periphery of the cam (7) for allowing a rope to pass through; the handle (3) is rotatably arranged on a side of the fixed side plate (2) away from the cam (7), a wedge block (33) is rotatably embedded between the handle (3) and the fixed side plate (2), a convex block (71) is installed at the end of the cam (7) on the side facing the fixed side plate (2), the handle (3) and the cam (7) are rotatable via the wedge block (33) and the convex block (71), and the contact point between the wire groove provided on the cam (7) and the rope moves inward and outward directions as the cam (7) rotates, so as to control the descending speed of the rope.

2. The device for preventing panic descent according to claim 1, characterized in that: The handle (3) further comprises a second rotating shaft (34), wherein one end of the second rotating shaft (34) is sleeved with a second spring; a fourth clamping groove (32), a sliding groove (35), a fixed groove (36) and a rotating groove (37) are respectively formed on a side of the handle (3) close to the fixed side plate (2); the rotating groove (37) is formed at one end of the handle (3); one end of the second rotating shaft (34) passes through the rotating groove (37) and is rotatably connected to the handle (3); the other end of the second rotating shaft (34) passes through the fixed side plate (2) and is rotatably connected to the fixed side plate (2); and the second spring is arranged between the handle (3) and the fixed side plate (2); The inner diameter of the fourth clamping groove (32) matches the maximum outer diameter of the first limiting column to receive the first limiting column; the first limiting column is used to limit the displacement of the handle (3).

3. The device for preventing panic descent according to claim 2, characterized in that: The wedge block (33) comprises a rotating block, one end of which is fixedly provided with a protrusion; the slide groove (35) and the fixed groove (36) are adjacent to each other on the same side and are connected through and through, the protrusion of the rotating block is rotatably embedded in the fixed groove (36), and the rotating block is rotatably provided in the slide groove (35) and abuts against the inner wall of the slide groove (35); the wedge block (33) is used to limit the rotation range of the handle.

4. The device for preventing panic descent according to claim 1, characterized in that: The movable side plate (1), a cover (4) and a fixed plate are also included; the movable side plate (1) is rotatably arranged on a side of the fixed friction block (8) away from the fixed side plate (2); the cover (4) is arranged on a side wall of the movable side plate (1) away from the fixed friction block (8); a friction lip (10) is arranged on the fixed cover on the peripheral side plates of the cover (4) and the movable side plate (1) to limit the position of the cover and the movable side plate (1); a fixing hole is opened at one end of the cover away from the friction lip (10); the fixed plate is arranged on a side of the fixing hole away from the movable side plate (1); and the fixed plate is fixedly connected to the cover (4) and the movable side plate (1) via a fixing member.

5. The device for preventing panic descent according to claim 4, characterized in that: The device also comprises a switch (6), wherein the switch (6) comprises a first switch and a second switch, wherein the first switch and the second switch are connected as a whole by riveting or screwing; the switch (6) sequentially penetrates the cover (4) and the movable side plate (1), and is installed and connected to the cover (4) and the movable side plate (1) to control the opening and closing of the movable side plate (1).

6. The device for preventing panic descent according to claim 1, characterized in that: It also includes a fixed friction block (8) and a first rivet (31); the fixed friction block (8) is fixedly arranged on the side walls at both ends of the fixed side plate (2); the first rivet (31) includes a first fixed column and a first limiting column, one end of the first fixed column is fixedly connected to one end of the first limiting column, and the maximum outer diameter of the first fixed column is smaller than the maximum outer diameter of the first limiting column; the end of the first fixed column away from the first limiting column sequentially penetrates the fixed side plate (2) and the fixed friction block (8), and the fixed side plate (2) and the fixed friction block (8) are fixedly connected, and the side where the first limiting column and the first fixed column are connected abuts against the fixed side plate (2); A corresponding wire groove is provided on the outer circumference of the fixed friction block (8) for the rope to pass through.

7. The device for preventing panic descent according to claim 6, characterized in that: The movable side plate (1) further comprises a first rotating shaft (11), the movable side plate (1) being rotatably connected to the first rotating shaft (11), and the fixed friction block (8) and the fixed side plate (2) being fixedly connected to the first rotating shaft (11); the first rotating shaft (11) sequentially passes through the fixed side plate (2), the fixed friction block (8) and the movable side plate (1), and first limiting plates are fixedly arranged at both ends of the first rotating shaft (11) to limit the fixed side plate (2), the fixed friction block (8) and the movable side plate (1) on the first rotating shaft (11).

8. The device for preventing panic descent according to claim 4, characterized in that: A switch slot and a first switch hole are provided on a side of the cover (4) facing the movable side plate (1); the first switch comprises an operating rod, the operating rod cover is arranged on the outer side wall of the first switch hole and abuts against the side wall of the cover (4) away from the movable side plate (1); the second switch comprises a linkage rod, one end of the linkage rod passes through a mounting hole, a spring column is fixedly arranged on the outer side wall of one end of the mounting hole, a compression spring (61) is sleeved and installed on the outer periphery of the spring column, and the end of the compression spring (61) away from the spring column abuts against the side wall in the switch slot; the operating rod is connected to the mounting hole by rivets or screws, and one side of the linkage rod abuts against the inner wall of the cover (4); a clamping column is fixedly arranged on the side of the linkage rod away from the cover (4), and the clamping column is arranged at the end of the linkage rod away from the mounting hole; a third clamping slot (14) is passed through the movable side plate (1), and the end of the clamping column away from the cover (4) is embedded in the third clamping slot (14).

9. The device for preventing panic descent according to claim 6, characterized in that: The invention also comprises a hanging hole fixing block (9) and a second fixing shaft (91). The hanging hole fixing block (9) is arranged between the movable side plate (1) and the fixed side plate (2), and is fixedly connected to the fixed side plate (2) via the second fixing shaft (91). A first boss is arranged at one end of the second fixing shaft (91) away from the fixed side plate (2). A second clamping groove (13) is provided at one end of the movable side plate (1) away from the fixed friction block (8). The opening of the second clamping groove (13) is arranged toward the first boss. The maximum size of the inner wall of the second clamping groove (13) matches the first boss, so that the second clamping groove (13) is clamped with the first boss.

10. The device for preventing panic descent according to claim 1, characterized in that: The movable side plate (1) further comprises a first fixed shaft (73), the outer circumference of which is sleeved with a first spring, the first spring being in contact between the fixed side plate (2) and the cam (7), the cam (7) being mounted and connected to the fixed side plate (2) via the first fixed shaft (73), second limiting plates being arranged at both ends of the first fixed shaft (73), one of the second limiting plates being in contact with the outer wall of the fixed side plate (2), a second boss being fixedly arranged between the other second limiting plate and the first fixed shaft (73), a first slot (12) being arranged on the movable side plate (1), the opening of the first slot (12) being arranged towards the second boss, the maximum size of the inner wall of the first slot (12) being matched with the second boss, so that the first slot (12) is in contact with the second boss; and a convex block (71) being arranged at the end of the cam (7), the convex block (71) being slidably arranged on the outer circumference of the fixed side plate (2).

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