A cylinder device with stable operation

By setting a stabilizing mechanism and a lifting mechanism in the cylinder equipment, the problem of uneven force on the cylinder equipment during use is solved, the stable operation and long life of the equipment are achieved, and the production efficiency and adaptability are improved.

CN117047680BActive Publication Date: 2025-09-23SHANGHAI JUNYI IND AUTOMATION CO LTD
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Patent Information

Application Number
CN202311182552.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-09-14
Publication Date
2025-09-23
Estimated Expiration
2043-09-14

AI Technical Summary

Technical Problem

Existing cylinder equipment is subjected to uneven force during use, which causes serious damage to the equipment, reduces its service life, and affects the smooth operation of production and business activities.

Method used

By setting up a stabilizing mechanism, a lifting mechanism and a fixing mechanism, including left-handed torsion springs and right-handed torsion springs, rotating columns and threaded rods, U-shaped baffles and other components, the force balance and highly flexible adjustment of the cylinder equipment can be achieved to prevent the equipment from loosening and deflecting.

Benefits of technology

It achieves stable operation of cylinder equipment, extends equipment service life, reduces maintenance costs, and improves production efficiency and equipment adaptability.

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Abstract

The present invention relates to the technical field of cylinder clamps, and discloses a stably operating cylinder device, the stably operating cylinder device comprising a fixed platform, the top of the fixed platform is fixedly connected to a lower clamp, the side of the lower clamp is fixedly connected to a stabilizing mechanism, the front of the lower clamp is connected to the output end of the cylinder device, and the stably operating cylinder device prevents the cylinder device from being damaged during long-term use due to the relative change of the center of gravity of the object on the pressure arm and the cylinder shaft during its movement, thereby preventing the cylinder device from being damaged during long-term use. This is beneficial to protecting the cylinder device, reducing the maintenance cost of the equipment, ensuring that the equipment can work stably for a long time, and improving production efficiency and the smooth and orderly operation of production and operation activities.
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Description

Technical Field

[0001] The present invention relates to the technical field of cylinder clamps, in particular to a cylinder device with stable operation. Background Art

[0002] A cylinder is a cylindrical metal component that guides a piston's linear reciprocating motion within it. Air expands in an engine cylinder, converting thermal energy into mechanical energy; while gas in a compressor cylinder is compressed by a piston, increasing its pressure. Cylinders are widely used in printing (tension control), semiconductors (spot welding, chip grinding), automation control, robotics, and other fields, playing a crucial role in production and operations.

[0003] Currently, most of the cylinder equipment on the market has a simple structure and a single function. During use, the cylinder equipment is often affected by its working state and force angle, which makes the kinetic energy provided by the cylinder equipment during use extremely uncertain. At the same time, the cylinder equipment will also increase the damage to itself during use, seriously reducing its service life, which is not conducive to the smooth and orderly operation of production and operation activities. Summary of the Invention

[0004] The object of the present invention is to provide a cylinder device with stable operation to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a cylinder device with stable operation, comprising a fixed platform, a lower clamp fixedly connected to the top of the fixed platform, a stabilizing mechanism fixedly connected to the side of the lower clamp, the front of the lower clamp being connected to the output end of the cylinder device, a flexible pressing clamp being provided above the lower clamp, a handle being provided above the flexible pressing clamp, a lifting mechanism being provided on the side of the fixed platform, a fixing mechanism being provided above the lifting mechanism, and the stabilizing mechanism comprising:

[0006] A fixed bracket, wherein the bottom of the fixed bracket is fixedly connected to the top of the fixed platform, a cylinder connecting disc is provided on the upper side of the fixed bracket, a first connecting disc is threadedly connected to the side of the cylinder connecting disc, and a first slot is provided above the first connecting disc;

[0007] A fixed disc, the bottom of which is fixedly connected to the top of the connecting block, one side of which is threadedly connected to a second connecting disc, a second slot being provided above the second connecting disc, a side of which is fixedly connected to a rotating shaft, the rotating shaft being provided inside the first connecting disc and the second fixed disc;

[0008] A left-handed torsion spring, the inner portion of which is fitted and connected to the outer wall of the rotating shaft, the top end of which is snap-connected to the inner wall of the second slot, the bottom end of which is fixedly connected to the top of the fixed bracket, a right-handed torsion spring is provided on the side of the left-handed torsion spring, the inner wall of which is fitted and connected to the outer wall of the rotating shaft, the top end of which is snap-connected to the inner wall of the first slot, the bottom end of which is fixedly connected to the top of the fixed bracket, a detachable protective cover is provided above the first connecting disk, a connecting frame is fixedly connected below the detachable protective cover, a connecting block is fixedly connected to the side of the fixed bracket, and the side of the connecting frame is snap-connected to the bottom of the connecting block. The stabilizing mechanism is provided to stabilize the force and speed of the cylinder during movement, thereby protecting the cylinder equipment.

[0009] Preferably, a lifting mechanism is provided on the side of the fixed platform, and the lifting mechanism includes a rotating column, the outer wall of the rotating column is rotatably connected to the side of the fixed platform, the bottom of the rotating column is rotatably connected to the top of the top plate, the bottom of the top plate is fixedly connected to the fixed plate, the side of the fixed plate is rotatably connected to a threaded rod, the side of the threaded rod is fixedly connected to one side of the turntable, and the other side of the turntable is fixedly connected to a rotating handle, and the threaded rod and the gear are meshed and connected, so that the rotating handle drives the gear to rotate.

[0010] Preferably, a gear is meshedly connected at the bottom of the threaded rod, and the side of the gear is fixedly connected to the middle of the fixed shaft. Both sides of the fixed shaft pass through and rotate in the middle of the side plate. The side of the side plate is fixedly connected to a U-shaped baffle, and the inner wall of the U-shaped baffle is slidably fitted on the outer wall of the fixed column. By setting the U-shaped baffle and the side plate, the gear and the vertical tooth plate are meshed and connected, and the height of the U-shaped baffle can be adjusted at the same time.

[0011] Preferably, the side of the fixed column is fixedly connected with a vertical tooth plate, the vertical tooth plate and the gear are meshed together, the bottom of the fixed column is fixedly connected with a base, the top of the base is fixedly connected to the bottom of the vertical tooth plate, the top of the vertical tooth plate is fixedly connected to the bottom of the fixing ring, and the fixing ring is fixedly connected to the upper outer wall of the fixed column. By setting up a lifting mechanism, the height of the fixed platform can be flexibly adjusted.

[0012] Preferably, a fixing mechanism is provided on the upper outer wall of the fixed column, and the fixing mechanism includes a U-shaped rotating ring, and the side of the U-shaped rotating ring is fixedly connected to the side of the fixed platform. The outer wall of the U-shaped rotating ring is penetrated by a fixing groove, and the side of the fixing groove is rotatably connected to a swing rod, and the middle part of the swing rod is fixedly connected to a cam, and the cam is provided inside the fixing groove. Both sides of the swing rod are fixedly connected to one side of the Y-shaped handle. The setting of the fixing mechanism plays a role in fixing and limiting the lifting mechanism.

[0013] Preferably, the outer wall of the rotating shaft passes through the middle of the left-handed torsion spring and the right-handed torsion spring, and the width and torque of the left-handed torsion spring and the right-handed torsion spring are equal. By setting the left-handed torsion spring and the right-handed torsion spring with relative torque, the force and speed of the cylinder equipment during movement can be stably adjusted, thereby protecting the cylinder equipment.

[0014] Preferably, connecting blocks are fixedly connected to both sides of the upper part of the fixed bracket, and the top of the connecting block is flush with the top of the fixed bracket. By setting the connecting blocks, the detachable protective cover is fixed and the interior of the stabilizing mechanism is protected by the detachable protective cover.

[0015] Preferably, the lifting mechanism is arranged on the side of the fixed platform, and the number of the lifting mechanisms is four. The lifting mechanisms are equidistantly distributed on the four sides of the fixed platform with the center of the fixed platform as the axis. By arranging the lifting mechanisms around the fixed platform, the heights around the fixed platform can be flexibly adjusted, which is beneficial for the equipment to use various tilt angles of the ground, and ensures that the equipment above the fixed platform is always in a horizontal state.

[0016] Preferably, a cam is provided on the inner wall of the fixed groove, and a swing rod is fixedly connected to the side of the cam. The swing rod passes through and rotates on both sides of the fixed groove. The width of the cam is slightly larger than the distance from the swing rod to the outer wall of the rotating column. By setting up a fixing mechanism, the height of each group of lifting mechanisms is fixed and limited, preventing the lifting mechanism from loosening and causing the fixed platform to loosen and deviate, thereby causing damage to the equipment above the fixed platform.

[0017] Compared with the prior art, the present invention provides a cylinder device with stable operation, which has the following beneficial effects:

[0018] 1. The cylinder equipment with stable operation is provided with a stabilizing mechanism to prevent the cylinder equipment from being damaged during long-term use due to the relative change of the center of gravity of the object on the pressure arm and the cylinder shaft during its movement, which leads to inconsistent force and speed of the cylinder. This is beneficial to protecting the cylinder equipment, reducing the maintenance cost of the equipment and the work difficulty of the personnel, and ensuring that the overall equipment can work stably for a long time, which is beneficial to improving production efficiency and the smooth and orderly operation of production and operation activities.

[0019] 2. The cylinder equipment with stable operation can flexibly adjust the height and tilt angle of the fixed platform by setting up multiple sets of lifting mechanisms, which is beneficial for the equipment to adapt to various working environments and terrain requirements, improves the adaptability of the equipment and the stability of the working process. By setting up the fixing mechanism, each set of lifting mechanisms can be individually limited and fixed, which is beneficial to prevent damage to the entire equipment due to loosening and deviation of the lifting mechanism, and is beneficial to ensuring the service life of the equipment.

[0020] 3. The cylinder device with stable operation plays a role in fixing and limiting the lifting mechanism by setting a fixing mechanism, preventing the lifting mechanism from loosening and causing the equipment to tilt and slide. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the overall structure of the stabilizing mechanism of the present invention;

[0023] Figure 3 It is a side view schematic diagram of the overall structure of the stabilizing mechanism of the present invention;

[0024] Figure 4 This is a schematic diagram of the closed state of the overall structure of the stabilizing mechanism of the present invention;

[0025] Figure 5 This is a schematic diagram of the overall structure of the lifting mechanism of the present invention;

[0026] Figure 6 Schematic diagram of the overall structure cross section of the lifting mechanism of the present invention;

[0027] Figure 7 It is a schematic cross-sectional view of the overall structure of the fixing mechanism of the present invention.

[0028] Figure: 1. Fixed platform; 2. Lower fixture; 3. Stabilizing mechanism; 4. Cylinder device; 5. Optional clamping fixture; 6. Handle; 7. Lifting mechanism; 8. Fixing mechanism; 31. Fixed bracket; 32. Cylinder connecting disc; 33. First connecting disc; 34. First slot; 35. Fixed disc; 36. Second connecting disc; 37. Second slot; 38. Rotating shaft; 39. Left-handed torsion spring; 310. Right-handed torsion spring; 311. Removable protective cover. 312. Connecting frame; 313. Connecting block; 71. Rotating column; 72. Top plate; 73. Fixed plate; 74. Threaded rod; 75. Turntable; 76. Rotating handle; 77. Gear; 78. Fixed shaft; 79. Side plate; 710. U-shaped baffle; 711. Fixed column; 712. Vertical tooth plate; 713. Base; 714. Fixed ring; 81. U-shaped rotating ring; 82. Fixed groove; 83. Swing rod; 84. Cam; 85. Y-shaped handle. DETAILED DESCRIPTION

[0029] like Figure 1-7 As shown, the present invention provides a technical solution: a cylinder device with stable operation, including a fixed platform 1, a lower clamp 2 is fixedly connected to the top of the fixed platform 1, a stabilizing mechanism 3 is fixedly connected to the side of the lower clamp 2, the front of the lower clamp 2 is connected to the output end of the cylinder device 4, a flexible pressing clamp 5 is arranged above the lower clamp 2, a handle 6 is arranged above the flexible pressing clamp 5, a lifting mechanism 7 is arranged on the side of the fixed platform 1, and a fixing mechanism 8 is arranged above the lifting mechanism 7.

[0030] The stabilizing mechanism 3 includes a fixed bracket 31, the bottom of which is fixedly connected to the top of the fixed platform 1. A cylinder connecting disc 32 is provided on the upper side of the fixed bracket 31. A first connecting disc 33 is threadedly connected to the side of the cylinder connecting disc 32, and a first retaining groove 34 is defined above the first connecting disc 33. A fixed disc 35 is fixedly connected to the top of the connecting block 313 at its bottom. A second connecting disc 36 is threadedly connected to one side of the fixed disc 35, and a second retaining groove 37 is defined above the second connecting disc 36. The first retaining groove 34 and the second retaining groove 37 serve to secure and limit the left-handed torsion spring 39 and the right-handed torsion spring 310. The left-handed torsion spring 39 and the right-handed torsion spring 310 balance the forces acting on the object on the cylinder at various stages, minimizing the forces acting on the cylinder and achieving a dynamic balance. A rotating shaft 38 is fixedly connected to the side of the cylinder connecting disc 32. The rotating shaft 38 is disposed inside the first connecting disc 33 and the second fixed disc 35. A left-handed torsion spring 39 is attached. The inside of the left-handed torsion spring 39 is attached to the outer wall of the rotating shaft 38. The top of the left-handed torsion spring 39 is snap-connected to the inner wall of the second slot 37. The bottom of the left-handed torsion spring 39 is fixedly connected to the top of the fixed bracket 31. A right-handed torsion spring 310 is attached to the side of the left-handed torsion spring 39. The inner wall of the right-handed torsion spring 310 is attached to the outer wall of the rotating shaft 38. The top of the right-handed torsion spring 310 is snap-connected to the inner wall of the first slot 34. The bottom of the right-handed torsion spring 310 is fixedly connected to the top of the fixed bracket 31. A detachable protective cover 311 is disposed above the first connecting disc 33. A connecting bracket 312 is fixedly connected below the detachable protective cover 311. The detachable protective cover 311 protects the internal equipment of the stabilizing mechanism 3 from dust. The side of the fixed bracket 31 is fixedly connected to a connecting block 313, and the side of the connecting bracket 312 is snap-connected to the bottom of the connecting block 313. The setting of the connecting block 313 plays a role in fixing and limiting the detachable protective cover 311. The outer wall of the rotating shaft 38 passes through and rotates in the middle of the left-handed torsion spring 39 and the right-handed torsion spring 310. The width and torque of the left-handed torsion spring 39 and the right-handed torsion spring 310 are equal. The upper two sides of the fixed bracket 31 are fixedly connected to the connecting blocks 313, and the top of the connecting block 313 is flush with the top of the fixed bracket 31. The setting of the stabilizing mechanism 3 plays a role in stabilizing the force and speed of the cylinder during movement, and plays a role in protecting the cylinder equipment 4.

[0031] The above-mentioned lifting mechanism 7 includes a rotating column 71, the outer wall of the rotating column 71 is rotatably connected to the side of the fixed platform 1, the bottom of the rotating column 71 is rotatably connected to the top of the top plate 72, the bottom of the top plate 72 is fixedly connected to a fixed plate 73, the side of the fixed plate 73 is rotatably connected to a threaded rod 74, the side of the threaded rod 74 is fixedly connected to one side of the turntable 75, and the other side of the turntable 75 is fixedly connected to a turning handle 76. By setting the turning handle 76, the height of the equipment can be flexibly adjusted by the turning handle 76. The threaded rod 74 is meshed with a gear 77 at its lower portion. The side of the gear 77 is fixedly connected to the middle portion of a fixed shaft 78. Both sides of the fixed shaft 78 extend through and rotate in the middle portion of a side plate 79. A U-shaped baffle 710 is fixedly connected to the side of the side plate 79. The inner wall of the U-shaped baffle 710 is slidably connected to the outer wall of a fixed column 711. A vertical toothed plate 712 is fixedly connected to the side of the fixed column 711. The vertical toothed plate 712 and the gear 77 are meshed with each other. The meshing connection between the vertical toothed plate 712 and the gear 77 allows the height of the fixed platform 1 to be adjusted by rotating the threaded rod 74. The bottom of the fixed column 711 is fixedly connected to a base 713. The top of the base 713 is fixedly connected to the bottom of the vertical toothed plate 712. The top of the vertical toothed plate 712 is fixedly connected to the bottom of a fixing ring 714. The fixing ring 714 is fixedly connected to the upper outer wall of the fixed column 711. The fixing ring 714 and base 713 serve to securely limit the vertical toothed plate 712. Four lifting mechanisms 7 are installed on the sides of the fixed platform 1, equidistantly spaced on all four sides of the platform 1, with the center of the platform as the axis. These mechanisms allow for flexible adjustment of the height and tilt angle of the equipment.

[0032] The fixing mechanism 8 comprises a U-shaped rotating ring 81, the side of which is fixedly connected to the side of the fixed platform 1. A fixing slot 82 extends through the outer wall of the U-shaped rotating ring 81, which serves to securely limit the position of the cam 84 and the Y-shaped handle 85. A swing lever 83 is rotatably connected to the side of the fixing slot 82, and a cam 84 is fixedly connected to the middle of the swing lever 83. The cam 84 is located within the fixing slot 82, and the two sides of the swing lever 83 are fixedly connected to one side of the Y-shaped handle 85. The provision of the cam 84 ensures that the rotating column 71 can be fixed to the side of the fixed platform 1 by rotating the cam 84. A cam 84 is provided on the inner wall of the fixed groove 82, and a swing rod 83 is fixedly connected to the side of the cam 84. The swing rod 83 passes through and rotates on both sides of the fixed groove 82. The width of the cam 84 is slightly larger than the distance from the swing rod 83 to the outer wall of the rotating column 71. By setting up the fixing mechanism 8, the lifting mechanism 7 is fixed and limited to prevent the lifting mechanism 7 from loosening and causing the equipment to tilt and slide.

[0033] Working Principle: Lifting handle 6 raises the flexible clamp 5, allowing the workpiece to be placed above lower clamp 2. The cylinder 4 allows the flexible clamp 5 to be flexibly lifted or clamped. The stabilizing mechanism 3 stabilizes and uniforms the force and speed of the cylinder during movement, protecting the cylinder 4 and preventing damage over time, which could increase repair costs. The lifting mechanism 7 allows for flexible adjustment of the overall height of the device. Turning handle 76 adjusts the height of the U-shaped rotating ring 81 on the fixed column 711. The installation of the lifting mechanism 7 around the fixed platform 1 allows for flexible adjustment of the overall height and tilt angle of the device. Turning the Y-shaped handle 85 causes the cam 84 to clamp the rotating column 71, securing the height of the lifting mechanism 7 and, consequently, the height and angle of the entire fixed platform 1. This prevents the lifting mechanism 7 from loosening during operation, which could cause the device to shift, thus protecting the device.

[0034] The above generally describes the present invention in detail. However, it is obvious to those skilled in the art that modifications or improvements may be made based on the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A cylinder device with stable operation, comprising a fixed platform (1), characterized in that: The top of the fixed platform (1) is fixedly connected to a lower clamp (2), the side of the lower clamp (2) is fixedly connected to a stabilizing mechanism (3), the front of the lower clamp (2) is connected to the output end of the cylinder device (4), a flexible pressing clamp (5) is provided above the lower clamp (2), a handle (6) is provided above the flexible pressing clamp (5), a lifting mechanism (7) is provided on the side of the fixed platform (1), a fixing mechanism (8) is provided above the lifting mechanism (7), and the stabilizing mechanism (3) includes: A fixed bracket (31), the bottom of the fixed bracket (31) is fixedly connected to the top of the fixed platform (1), a cylinder connecting disc (32) is provided on the upper side of the fixed bracket (31), a first connecting disc (33) is threadedly connected to the side of the cylinder connecting disc (32), and a first slot (34) is provided above the first connecting disc (33); A fixed disc (35), the bottom of which is fixedly connected to the top of the connecting block (313), one side of which is threadedly connected to a second connecting disc (36), a second slot (37) being provided above the second connecting disc (36), a side of which is fixedly connected to a rotating shaft (38), and the rotating shaft (38) being provided inside the first connecting disc (33) and the fixed disc (35); A left-handed torsion spring (39), the interior of which is fitted and connected to the outer wall of the rotating shaft (38), the top end of which is snap-fitted and connected to the inner wall of the second slot (37), the bottom end of which is fixedly connected to the top of the fixed bracket (31), the side of which is provided with a right-handed torsion spring (310), the inner wall ... the The end buckle is connected to the inner wall of the first slot (34), the bottom end of the right-hand torsion spring (310) is fixedly connected to the top of the fixed bracket (31), a detachable protective cover (311) is provided above the first connecting plate (33), a connecting frame (312) is fixedly connected below the detachable protective cover (311), a side of the fixed bracket (31) is fixedly connected to a connecting block (313), and a side buckle of the connecting frame (312) is connected to the bottom of the connecting block (313).

2. The cylinder device with stable operation according to claim 1, characterized in that: A lifting mechanism (7) is provided on the side of the fixed platform (1), and the lifting mechanism (7) comprises a rotating column (71), the outer wall of the rotating column (71) is rotatably connected to the side of the fixed platform (1), the bottom of the rotating column (71) is rotatably connected to the top of the top plate (72), the bottom of the top plate (72) is fixedly connected to a fixed plate (73), the side of the fixed plate (73) is rotatably connected to a threaded rod (74), the side of the threaded rod (74) is fixedly connected to one side of a turntable (75), and the other side of the turntable (75) is fixedly connected to a rotating handle (76).

3. The cylinder device with stable operation according to claim 2, characterized in that: A gear (77) is meshedly connected to the bottom of the threaded rod (74), and the side of the gear (77) is fixedly connected to the middle of the fixed shaft (78). Both sides of the fixed shaft (78) pass through and rotate in the middle of the side plate (79). A U-shaped baffle (710) is fixedly connected to the side of the side plate (79), and the inner wall of the U-shaped baffle (710) is slidably connected to the outer wall of the fixed column (711).

4. The cylinder device with stable operation according to claim 3, characterized in that: A vertical tooth plate (712) is fixedly connected to the side of the fixed column (711), and the vertical tooth plate (712) and the gear (77) are meshed and connected. The bottom of the fixed column (711) is fixedly connected to a base (713), and the top of the base (713) is fixedly connected to the bottom of the vertical tooth plate (712). The top of the vertical tooth plate (712) is fixedly connected to the bottom of a fixing ring (714), and the fixing ring (714) is fixedly connected to the upper outer wall of the fixed column (711).

5. The cylinder device with stable operation according to claim 3, characterized in that: A fixing mechanism (8) is provided on the upper outer wall of the fixing column (711), and the fixing mechanism (8) includes a U-shaped rotating ring (81), the side of the U-shaped rotating ring (81) is fixedly connected to the side of the fixed platform (1), the outer wall of the U-shaped rotating ring (81) is penetrated by a fixing groove (82), the side of the fixing groove (82) is rotatably connected to a swing rod (83), the middle part of the swing rod (83) is fixedly connected to a cam (84), the cam (84) is arranged inside the fixing groove (82), and both sides of the swing rod (83) are fixedly connected to one side of the Y-shaped handle (85).

6. The cylinder device with stable operation according to claim 1, characterized in that: The outer wall of the rotating shaft (38) passes through and rotates in the middle of the left-handed torsion spring (39) and the right-handed torsion spring (310), and the width and torque of the left-handed torsion spring (39) and the right-handed torsion spring (310) are equal.

7. The cylinder device with stable operation according to claim 1, characterized in that: Connecting blocks (313) are fixedly connected to both sides of the upper portion of the fixing bracket (31), and the top of the connecting block (313) is flush with the top of the fixing bracket (31).

8. The cylinder device with stable operation according to claim 2, characterized in that: The lifting mechanisms (7) are arranged on the side of the fixed platform (1), and there are four groups of the lifting mechanisms (7). The lifting mechanisms (7) are equidistantly distributed on the four sides of the fixed platform (1) with the center of the fixed platform (1) as the axis.

9. The cylinder device with stable operation according to claim 5, characterized in that: A cam (84) is provided on the inner wall of the fixed groove (82), and a swing rod (83) is fixedly connected to the side of the cam (84). The swing rod (83) passes through and rotates on both sides of the fixed groove (82). The width of the cam (84) is slightly larger than the distance from the swing rod (83) to the outer wall of the rotating column (71).

Citation Information

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