Moving claw for metal scraps

Abstract

The invention relates to a moving claw for metal chippings, and belongs to the technical field of waste metal recycling, the moving claw comprises a claw body and a plurality of clamping claws arranged in the circumferential direction of the lower side of the claw body, the clamping claws are rotationally connected with the claw body, and a mounting arm is arranged on the upper side of the claw body; the claw body is provided with a rotating assembly for driving the clamping claws to rotate at the same time, a contact is installed on the lower side of the claw body, and the contact is in radio connection with a control host capable of controlling the rotating assembly. The device has the effects that the possibility that chippings fall off is reduced, and the adverse effect on the working efficiency is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of scrap metal recycling, and in particular to a mobile claw for metal scraps. Background Art

[0002] When processing scrap steel, usually metal scraps such as steel slag from steel mills and recycled resources such as wood shavings are transported to the scrap steel processing site, and the scraps are unloaded by the mobile claw for metal scraps. When unloading, the staff drives the mobile claw for metal scraps to move in the direction close to the scraps and open it. When the mobile claw is inserted into the scraps, the staff drives the mobile claw to grab the scraps and drive the scraps to move until the unloading is completed.

[0003] In the related art, the debris is grabbed by manually controlling the moving claw, which may cause the debris to fall due to insufficient grabbing of the debris, thereby adversely affecting the work efficiency. Summary of the invention

[0004] In order to reduce the possibility of debris falling and reduce the adverse impact on work efficiency, the present application provides a mobile claw for metal debris.

[0005] The mobile claw for metal chips provided in this application adopts the following technical solution: A mobile claw for metal scraps comprises a claw body and a plurality of clamping claws arranged along the circumference of the lower side of the claw body, the clamping claws being rotatably connected to the claw body, a mounting arm being provided on the upper side of the claw body, a rotating assembly being provided on the claw body for driving the clamping claws to rotate simultaneously, a contact being installed on the lower side of the claw body, and the contact being wirelessly connected to a control host capable of controlling the rotating assembly.

[0006] By adopting the above technical solution, the driving mounting arm drives the claw body to move in the direction close to the debris. At this time, the clamping claw opens and continues to drive the gripping body to move in the direction close to the debris until the contact on the lower side of the claw body contacts the debris. At this time, the control host receives the electrical signal and drives the clamping claw to rotate through the rotating component, thereby grabbing the debris, improving the stability of the clamping claw, reducing the possibility of debris falling due to unstable clamping of the manually driven clamping claw, and reducing the adverse effects on work efficiency.

[0007] Optionally, a rotating rod corresponding to the clamping claw one-to-one and rotatably connected to the clamping claw is provided on the lower side of the claw body, the upper end of the rotating rod is inserted into the claw body and fixedly connected to a rotating disk rotatably connected to the claw body, and a motor for driving the rotating disk to rotate is installed in the claw body.

[0008] By adopting the above technical solution, the motor drives the rotating disk to drive the clamping claw to rotate along the circumference of the rotating disk through the rotating rod, thereby facilitating the adjustment of the gripping angle of the clamping claw, facilitating the gripping of debris, reducing the possibility of debris falling, and reducing the adverse effect on work efficiency.

[0009] Optionally, the rotating assembly includes a rotating rod corresponding to the clamping claws one by one and with one end sleeved on the upper end of the clamping claws, the upper end of the rotating rod is equipped with a rotating disk slidably connected to the side wall of the claw body, and the claw body is provided with a driving member for driving the rotating disk to slide.

[0010] By adopting the above technical solution, the driving member drives the rotating disk to slide in the height direction of the claw body. At this time, the rotating rod moves with the rotating disk and drives the upper end of the clamping claw to move, which is convenient for driving the lower clamping claw to rotate, and then convenient for controlling the opening or closing of the clamping claw, thereby improving the stability of the clamping claw, reducing the possibility of debris falling due to unstable clamping of the manually driven clamping claw, and reducing the adverse effects on work efficiency.

[0011] Optionally, the driving member includes a hydraulic cylinder installed on the lower side of the rotating disk, the hydraulic cylinder is connected to the control host by radio, and the telescopic rod of the hydraulic cylinder faces the rotating disk and is fixedly connected to the rotating disk.

[0012] By adopting the above technical solution, the telescopic rod of the hydraulic cylinder is extended or shortened, thereby driving the rotating disk to move in the height direction of the claw body, thereby controlling the opening or closing of the clamping claw, making it easier to grab debris and improving the stability of the clamping claw.

[0013] Optionally, a rotating shaft is passed through and fixedly connected to the lower side of the rotating rod, the upper end of the clamping claw is sleeved on the outside of the rotating shaft and is rotatably connected to the rotating shaft, the length of the rotating shaft is greater than the width of the clamping claw, and both sides of the clamping claw are abutted against a first spring fixedly connected to the side wall of the rotating rod, and a vibrating part for driving the clamping claw to vibrate is provided on the side wall of the rotating rod.

[0014] By adopting the above technical solution, in the process of driving the clamping claw to rotate along the rotating shaft, the vibrator pushes the clamping claw to move along the length direction of the rotating shaft. At this time, the first springs on both sides of the clamping claw are deformed. When the clamping claw rotates to disengage from the vibrator, the first spring restores the deformation and drives the clamping claw to reset, thereby driving the clamping claw to vibrate relative to the rotating shaft, reducing the possibility of debris being clamped in the gap between two adjacent clamping claws, thereby reducing the possibility of debris falling during movement, and at the same time reducing the possibility of debris grasped between the clamping claws accumulating through vibration, thereby increasing the amount of debris grasped at a single time and improving work efficiency.

[0015] Optionally, the vibrating member includes a plurality of vibrating teeth fixedly connected to one side of the rotating rod and adapted to the rotation direction of the clamping claw. The end of the vibrating tooth close to the clamping claw is arranged in an arc shape, and the end of the vibrating tooth can contact the side wall of the clamping claw and drive the clamping claw to move.

[0016] By adopting the above technical solution, the clamping claw contacts each vibrating tooth in turn when rotating along the rotating shaft. At this time, the vibrating tooth pushes the clamping claw to move away from the vibrating tooth. When the clamping claw moves between two vibrating teeth or disengages from the vibrating tooth, the first spring restores its deformation and pushes the clamping claw to reset, thereby facilitating driving the clamping claw to vibrate back and forth on the rotating shaft, reducing the possibility of debris getting stuck between the two clamping claws. At the same time, vibration reduces the possibility of debris caught between the clamping claws accumulating and floating, thereby improving work efficiency.

[0017] Optionally, both sides of the clamping claw are plugged into and slidably connected to limit plates, and a sliding component for driving the limit plates to slide is provided in the clamping claw.

[0018] By adopting the above technical solution, when the clamping claws close and complete the grabbing of debris, the sliding assembly drives the end of the limit plate to slide to the outside of the corresponding clamping claws, further increasing the contact area between the clamping claws and the debris, and reducing the possibility of debris falling from the gap between two adjacent clamping claws.

[0019] Optionally, the sliding assembly includes a sliding rod with one end inserted into the clamping claw and slidably connected to the clamping claw along the length direction of the clamping claw, the limiting plate is hinged with an upwardly inclined hinged rod at one end close to the sliding rod, the other end of the hinged rod is hinged to the side wall of the sliding rod, and the lower end of the sliding rod is provided with a second spring fixed to the inner wall of the clamping claw.

[0020] By adopting the above technical solution, the sliding rod is driven to move in the direction close to the second spring, thereby pushing the limit plate to move through the hinged rod until the end of the limit plate abuts against the adjacent side wall of the clamping claw, thereby facilitating the sealing of the gap between the two adjacent clamping claws and increasing the contact area between the clamping claws and the debris, thereby reducing the possibility of debris falling during movement.

[0021] Optionally, the cross-section of the rotating shaft in the width direction is set to an ellipse, and the clamping claws are provided with through holes adapted to the major axis of the cross-section of the rotating shaft, the upper end of the sliding rod passes through the clamping claws and is inserted into the through hole, and the side wall of the rotating shaft can contact the end of the sliding rod and squeeze the sliding rod.

[0022] By adopting the above technical solution, when the clamping claw rotates to close, one end of the rotating shaft cross section in the length direction squeezes the sliding rod to move in the direction close to the second spring. At this time, the sliding rod pushes the limit plate to move in the direction away from the sliding rod through the hinge rod, and the second spring is compressed. When the clamping claw rotates and opens, one end of the rotating shaft cross section disengages from the sliding rod. At this time, the second spring restores its deformation and pushes the sliding rod to reset. At this time, the limit plate completely enters the clamping claw under the drive of the hinge rod, which is convenient for driving the limit plate to reset and improves work efficiency.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: The driving mounting arm drives the claw body to move in the direction close to the debris, at which time the clamping claw opens and continues to drive the gripping body to move in the direction close to the debris until the contact point on the lower side of the claw body contacts the debris. At this time, the control host receives an electrical signal and drives the clamping claw to rotate through the rotating component, thereby grabbing the debris, improving the stability of the clamping claw, reducing the possibility of debris falling due to unstable clamping of the manually driven clamping claw, and reducing the adverse effect on work efficiency; In the process of driving the clamping claw to rotate along the rotating shaft, the vibrating member pushes the clamping claw to move along the length direction of the rotating shaft. At this time, the first springs on both sides of the clamping claw are deformed. When the clamping claw rotates to be separated from the vibrating member, the first spring recovers the deformation and drives the clamping claw to reset, thereby driving the clamping claw to vibrate relative to the rotating shaft, reducing the possibility of debris being clamped in the gap between two adjacent clamping claws, thereby reducing the possibility of debris falling during the movement, and at the same time reducing the possibility of debris accumulation between the clamping claws through vibration, thereby increasing the amount of debris captured in a single time and improving work efficiency; The driving sliding rod moves in the direction close to the second spring, thereby pushing the limit plate to move through the hinged rod until the end of the limit plate abuts against the adjacent side wall of the clamping claw, thereby facilitating the blocking of the gap between the two adjacent clamping claws and increasing the contact area between the clamping claws and the debris, thereby reducing the possibility of debris falling during movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of a mobile claw for metal debris in an embodiment of the present application.

[0025] Figure 2 It is a structural schematic diagram of the positional relationship between the rotating assembly and the clamping claw in the embodiment of the present application.

[0026] Figure 3 It is a structural schematic diagram of the positional relationship between the sliding assembly and the clamping claw in the embodiment of the present application.

[0027] Figure 4 yes Figure 3 A magnified view of the structure in the middle.

[0028] Explanation of the accompanying drawings: 1. claw body; 11. cavity; 2. clamping claw; 21. rotating rod; 211. rotating disk; 212. motor; 213. mounting groove; 22. rotating shaft; 23. limit block; 24. first spring; 25. control chamber; 26. through hole; 3. rotating assembly; 31. rotating rod; 311. driving hole; 32. rotating disk; 33. hydraulic cylinder; 4. mounting plate; 41. contact; 5. vibrating tooth; 6. limit plate; 7. sliding assembly; 71. sliding rod; 72. second spring; 73. hinged rod. DETAILED DESCRIPTION

[0029] The present application is further described in detail below in conjunction with the accompanying drawings.

[0030] The present application discloses a mobile claw for metal scraps. Figure 1 and Figure 2 A mobile claw for metal scraps includes a claw body 1 and a plurality of clamping claws 2 evenly distributed along the circumference of the lower side of the claw body 1. In the embodiment of the present application, there are five of them. A mounting arm (not shown in the figure) for driving the claw body 1 to move is installed on the upper side of the claw body 1. A rotating rod 21 corresponding to the clamping claw 2 is provided on the lower side of the claw body 1. The lower ends of the rotating rods 21 are inclined to the side away from the rotation axis 22 of the claw body 1. A cavity 11 is opened inside the claw body 1. The upper ends of the rotating rods 21 are located in the cavity 11 and are fixedly connected to a rotating disk 211 at the same level. A motor 212 fixedly connected to the inner wall of the claw body 1 is installed at the axis center of the upper side of the rotating disk 211.

[0031] The lower end of the rotating rod 21 is provided with a mounting groove 213 with a notch downward, and the lower end of the rotating rod 21 is penetrated and fixedly connected with a rotating shaft 22 perpendicular to the length direction of the rotating rod 21, the upper end of the clamping claw 2 is sleeved on the corresponding rotating shaft 22 and is rotatably connected to the rotating shaft 22, and a rotating component 3 is provided on the gripping body to drive the clamping claw 2 to rotate simultaneously.

[0032] The lower end of the rotating rod 21 and one side close to each other are fixedly connected with a mounting plate 4 at the same level, and a contact 41 is installed on the lower side of the mounting plate 4. The contact 41 is wirelessly connected to a control host (not shown in the figure), and the control host can control the rotating component 3 to drive the clamping claw 2 to rotate.

[0033] The driving mounting arm drives the claw body 1 to move toward the direction close to the debris. At this time, the clamping claw 2 opens and continues to drive the grasping body to move toward the direction close to the debris until the contact 41 on the lower side of the claw body 1 contacts the debris. At this time, the control host receives an electrical signal and drives the clamping claw 2 to rotate through the rotating component 3, thereby grabbing the debris.

[0034] The motor 212 drives the rotating disk 211 to drive the clamping claw 2 to rotate along the circumference of the rotating disk 211 through the rotating rod 21, so as to adjust the gripping angle of the clamping claw 2, grab the debris and reduce the possibility of the debris falling.

[0035] Reference Figure 1 and Figure 2 The rotating assembly 3 includes a vertical rotating rod 31 corresponding to the clamping claw 2 and located on the upper side of the mounting plate 4. The lower end of the rotating rod 31 is provided with a driving hole 311. The upper end of the clamping claw 2 passes through the corresponding driving hole 311 and is fixedly connected to the limit block 23. The upper end of the clamping claw 2 is in contact with the side wall of the rotating rod 31 through the driving hole 311 and is slidably connected. The upper end of the rotating rod 31 is fixedly connected with a rotating disk 32 at the same level. The rotating disk 32 moves in the vertical direction. The claw body 1 is provided with a driving member for driving the rotating disk 32 to move.

[0036] In the embodiment of the present application, the driving member is configured as a vertical hydraulic cylinder 33, one end of the hydraulic cylinder 33 is fixedly connected to the lower side of the rotating disk 211, the telescopic rod of the hydraulic cylinder 33 faces the rotating disk 32 and is fixedly connected to the rotating disk 32, and the hydraulic cylinder 33 is connected to the control host radio.

[0037] The telescopic rod of the hydraulic cylinder 33 is shortened and drives the rotating rod 31 to move upward through the rotating disk 32. At this time, the rotating rod 31 drives the upper end of the clamping claw 2 to move with the moving rod through the limit block 23, reducing the possibility of the upper end of the clamping claw 2 being separated from the rotating rod 31. At this time, the clamping claw 2 is closed under the drive of the rotating rod 31, thereby completing the debris capture.

[0038] When the clamping claw 2 is opened and the material is discharged, the telescopic rod of the hydraulic cylinder 33 extends and drives the rotating disk 32 and the rotating rod 31 to move downward and squeeze the upper end of the clamping claw 2, thereby driving the end of the clamping claw 2 away from the rotating rod 31 to rotate upward along the rotating shaft 22, so as to facilitate the full opening of the clamping claw 2, facilitate material discharge, and improve the stability of the clamping claw 2.

[0039] Reference Figure 2 , Figure 3 and Figure 4 The length of the rotating shaft 22 is greater than the width of the upper end of the clamping claw 2. Both sides of the upper end of the clamping claw 2 are abutted against the first spring 24 sleeved on the end of the rotating shaft 22. The ends of the first spring 24 that are away from each other are fixedly connected to the inner wall of the rotating rod 21. When the first spring 24 is at its original length, the clamping claw 2 coincides with the corresponding midline of the rotating shaft 22. The rotating rod 21 is provided with a vibrating member that drives the clamping claw 2 to slide on the corresponding rotating shaft 22.

[0040] Reference Figure 1 and Figure 2The vibrating member includes a plurality of vibrating teeth 5 which are located on one side of the corresponding clamping claw 2 and are arranged in sequence along the rotation direction of the clamping claw 2. The clamping claw 2 can be inserted between two adjacent vibrating teeth 5. One end of the vibrating tooth 5 close to the corresponding clamping claw 2 is arranged in an arc shape, and one end of the vibrating tooth 5 in the arc shape can contact the side wall of the clamping claw 2 and push the clamping claw 2 to move.

[0041] In the process of driving the clamping claw 2 to rotate along the rotating shaft 22, the vibrating member pushes the clamping claw 2 to move along the length direction of the rotating shaft 22, and contacts each vibrating tooth 5 in turn. At this time, the vibrating tooth 5 pushes the clamping claw 2 to move away from the vibrating tooth 5. At this time, the first springs 24 on both sides of the clamping claw 2 are deformed. When the clamping claw 2 rotates along the rotating shaft 22, when the clamping claw 2 moves between the two vibrating teeth 5 or disengages from the vibrating teeth 5, the first spring 24 restores the deformation and drives the clamping claw 2 to reset, thereby facilitating the driving of the clamping claw 2 to vibrate back and forth on the rotating shaft 22, reducing the possibility of debris getting stuck between the two clamping claws 2, and thereby reducing the possibility of debris falling during movement. At the same time, vibration reduces the possibility of accumulation of debris captured between the clamping claws 2, thereby increasing the amount of debris captured at a single time and improving work efficiency.

[0042] Reference Figure 2 , Figure 3 and Figure 4 Arc-shaped limit plates 6 are inserted and slidably connected on both sides of the clamping claw 2, a control cavity 25 is opened in the clamping claw 2, one end of the limit plate 6 inserted into the clamping claw 2 is located in the control cavity 25, and a sliding component 7 for driving the limit plate 6 to slide is provided in the clamping claw 2.

[0043] Reference Figure 3 and Figure 4 The sliding assembly 7 includes a sliding rod 71 corresponding to the clamping claw 2 and one end of which is inserted into the control cavity 25. The sliding rod 71 is arranged along the length direction of the clamping claw 2, and a second spring 72 is installed between the sliding rod 71 and the inner side wall of the clamping claw 2 away from the rotating shaft 22. The end of the limit plate 6 inserted into the control cavity 25 is hinged with a hinge rod 73, and the end of the hinge rod 73 away from the limit plate 6 is hinged to the side wall of the sliding rod 71.

[0044] In the embodiment of the present application, the cross section of the rotating shaft 22 is set to be elliptical, and the upper end of the clamping claw 2 is provided with a through hole 26 adapted to the long axis of the rotating shaft 22, and the rotating shaft 22 is rotatably connected to the upper end of the clamping claw 2 through the through hole 26. The end of the sliding rod 71 away from the second spring 72 passes through the side wall of the clamping claw 2 and is located in the through hole 26. When the clamping claw 2 rotates until the long axis of the rotating shaft 22 is adapted to the length direction of the clamping claw 2, the clamping claw 2 is closed, and the side wall of the gripping shaft squeezes the sliding rod 71 to completely enter the clamping claw 2, and the second spring 72 is compressed.

[0045] When the clamping claw 2 is closed and grabs the debris, one end of the rotating shaft 22 in the length direction of the cross section squeezes the sliding rod 71 to move in the direction close to the second spring 72. At this time, the sliding rod 71 pushes the limit plate 6 to move away from the sliding rod 71 through the hinge rod 73. At this time, the second spring 72 is compressed, which is convenient for blocking the gap between the two adjacent clamping claws 2 and increasing the contact area between the clamping claws 2 and the debris, thereby reducing the possibility of debris falling during movement.

[0046] When the rotating rod 31 drives the clamping claw 2 to rotate and open, one end of the cross section of the rotating shaft 22 disengages from the sliding rod 71. At this time, the second spring 72 recovers its deformation and pushes the sliding rod 71 to reset. The limit plate 6 completely enters the clamping claw 2 under the drive of the hinge rod 73. At this time, the clamping claw 2 continues to be driven to rotate by the rotating rod 31 until the clamping claw 2 is fully opened, thereby opening the clamping claw 2 and releasing the material, reducing the possibility that the limit plate 6 hinders the opening of the clamping claw 2.

[0047] The implementation principle of a mobile claw for metal debris in the embodiment of the present application is: the driving installation arm drives the claw body 1 to move in the direction close to the debris, at which time the clamping claw 2 opens, and continues to drive the gripping body to move in the direction close to the debris, until the contact 41 on the lower side of the claw body 1 contacts the debris, at which time the control host receives an electrical signal and drives the clamping claw 2 to rotate through the hydraulic cylinder 33, thereby grabbing the debris; the motor 212 drives the rotating disk 211 to drive the clamping claw 2 to rotate circumferentially along the rotating disk 211 through the rotating rod 21, which is convenient for adjusting the gripping angle of the clamping claw 2, facilitating the gripping of debris and reducing the possibility of debris falling.

[0048] 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 mobile claw for metal chips, characterized in that: The invention comprises a claw body (1) and a plurality of clamping claws (2) arranged along the circumference of the lower side of the claw body (1); the clamping claws (2) are rotatably connected to the claw body (1); a mounting arm is provided on the upper side of the claw body (1); a rotating assembly (3) for driving the clamping claws (2) to rotate simultaneously is provided on the claw body (1); a contact (41) is installed on the lower side of the claw body (1); the contact (41) is wirelessly connected to a control host capable of controlling the rotating assembly (3).

2. The mobile claw for metal chips according to claim 1, characterized in that: A rotating rod (21) corresponding to the clamping claw (2) and rotatably connected to the clamping claw (2) is provided on the lower side of the claw body (1); the upper end of the rotating rod (21) is inserted into the claw body (1) and fixedly connected to a rotating disk (211) rotatably connected to the claw body (1); and a motor (212) for driving the rotating disk (211) to rotate is installed in the claw body (1).

3. The mobile claw for metal chips according to claim 2, characterized in that: The rotating assembly (3) comprises a rotating rod (31) corresponding to the clamping claw (2) one by one and having one end sleeved on the upper end of the clamping claw (2), the upper end of each rotating rod (31) is provided with a rotating disk (32) slidably connected to the side wall of the claw body (1), and the claw body (1) is provided with a driving member for driving the rotating disk (32) to slide.

4. The mobile claw for metal chips according to claim 3, characterized in that: The driving member comprises a hydraulic cylinder (33) mounted on the lower side of the rotating disk (211), the hydraulic cylinder (33) being connected to the control host by radio, and a telescopic rod of the hydraulic cylinder (33) facing the rotating disk (32) and fixedly connected to the rotating disk (32).

5. The mobile claw for metal chips according to claim 4, characterized in that: A rotating shaft (22) is passed through and fixedly connected to the lower side of the rotating rod (21); the upper end of the clamping claw (2) is sleeved on the outer side of the rotating shaft (22) and is rotatably connected to the rotating shaft (22); the length of the rotating shaft (22) is greater than the width of the clamping claw (2); both sides of the clamping claw (2) are in contact with first springs (24) fixedly connected to the side walls of the rotating rod (21); and a vibrating member for driving the clamping claw (2) to vibrate is provided on the side walls of the rotating rod (21).

6. The mobile claw for metal chips according to claim 5, characterized in that: The vibrating member comprises a plurality of vibrating teeth (5) fixedly connected to one side of the rotating rod (21) and adapted to rotate along the clamping claw (2); one end of the vibrating teeth (5) close to the clamping claw (2) is arranged in an arc shape, and the end of the vibrating teeth (5) is capable of contacting the side wall of the clamping claw (2) and driving the clamping claw (2) to move.

7. The mobile claw for metal chips according to claim 6, characterized in that: Both sides of the clamping claw (2) are plugged into and slidably connected to the limit plates (6), and a sliding component (7) for driving the limit plates (6) to slide is provided in the clamping claw (2).

8. The mobile claw for metal chips according to claim 7, characterized in that: The sliding assembly (7) comprises a sliding rod (71) having one end inserted into the clamping claw (2) and slidably connected to the clamping claw (2) along the length direction of the clamping claw (2); an end of the limiting plate (6) close to the sliding rod (71) is hingedly connected to an upwardly inclined hinge rod (73); the other end of the hinge rod (73) is hingedly connected to the side wall of the sliding rod (71); and a second spring (72) fixed to the inner wall of the clamping claw (2) is provided at the lower end of the sliding rod (71).

9. The mobile claw for metal chips according to claim 8, characterized in that: The cross-section of the rotating shaft (22) in the width direction is set to be an ellipse, and the clamping claws (2) are each provided with a through hole (26) adapted to the long axis of the cross-section of the rotating shaft (22), the upper end of the sliding rod (71) passes through the clamping claws (2) and is inserted into the through hole (26), and the side wall of the rotating shaft (22) is able to contact the end of the sliding rod (71) and squeeze the sliding rod (71).

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