Multi-size coaxial motor bearing extraction device

Abstract

The application relates to a multi-size coaxial motor bearing extraction device which takes a fixed frame, a worm wheel, an extraction rod, a bearing and a motor base as the main body; one side of the fixed frame is respectively provided with a first clamping rod, a second clamping rod and a third clamping rod; a first threaded pipe which can rotate is arranged in the middle of the fixed frame; a screw rod and a second threaded pipe are arranged in the first threaded pipe; the screw thread of the second threaded pipe is arranged on the inner surface of the second threaded pipe; the screw rod is inserted into the second threaded pipe and is engaged with the second threaded pipe; the bearing axis and the screw rod axis are on the same axis through the three extraction plates which are uniformly arranged at an angle of 120 DEG; the three extraction plates which are uniformly arranged at an angle of 120 DEG can adapt to different bearing inner diameters after compressing the elastic balls; the design is ingenious; the V-shaped clamping opening can clamp motor bases with different sizes; the V-shaped clamping opening can clamp the motor base through the cooperation of the first threaded pipe and the worm wheel to realize self-locking, and the use is convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor manufacturing, in particular to a multi-size coaxial motor bearing extraction device. BACKGROUND

[0002] At present, for the general bearing sleeved on the rotating shaft, a three-jaw tensioner can easily disassemble it. The pulling claw of the three-jaw tensioner pulls the outer periphery of the bearing upward, and then the rotating shaft is pushed downward through the middle top rod to realize the separation of the bearing and the rotating shaft.

[0003] However, for the motor, especially the current small-noise brushless motor, the bearing outer periphery is tightly fitted in the motor shell. When the bearing needs to be taken off from the motor shell, the three-jaw tensioner is not applicable. In the actual operation process, the bearing is prone to misalignment, and the bearing is unevenly stressed during disassembly, thereby causing damage to the bearing rolling groove, affecting the noise and service life of the motor during operation. At present, different motor sizes and different bearing sizes on the market urgently need a bearing disassembly device to simultaneously solve the disassembly problems of different motor sizes and different bearing sizes.

[0004] Therefore, it is necessary to manufacture a multi-size coaxial motor bearing extraction device to solve the above problems. SUMMARY

[0005] To solve the above problems, the present application provides a multi-size coaxial motor bearing extraction device.

[0006] The technical scheme adopted by the present application to solve its technical problems is: a multi-size coaxial motor bearing extraction device, taking a fixed frame, a worm gear, an extraction rod, a bearing and a motor seat as the main body; one side of the fixed frame is respectively provided with a first clamping rod, a second clamping rod and a third clamping rod, and the worm gear, the first clamping rod, the second clamping rod and the third clamping rod are symmetrically arranged on the middle surface of the fixed frame. The worm gear is fixedly connected with the second clamping rod, and the third clamping rod is connected with the front ends of the first clamping rod and the second clamping rod, i.e. the fixed frame, the first clamping rod, the second clamping rod and the third clamping rod form a quadrilateral structure; a first threaded pipe is arranged in the middle of the fixed frame and can rotate on the fixed frame, and the first threaded pipe is hollow and penetrates through; the first threaded pipe is engaged with the two worm gears on both sides; a screw rod and a second threaded pipe are arranged in the first threaded pipe, the threads of the second threaded pipe are arranged on the inner surface of the second threaded pipe, the screw rod penetrates through the second threaded pipe and is engaged with the second threaded pipe, the extraction rod is fixedly connected with the front end of the second threaded pipe, and the axis lines of the first threaded pipe, the second threaded pipe and the screw rod are on the same axis line; an extraction plate and a one-word handle are respectively arranged at the front end of the extraction rod and the end of the screw rod, the extraction plate is arranged at an angle of 120° around the front end of the extraction rod, and the second fixing pin and the elastic ball are arranged between the extraction plate and the extraction rod.

[0007] Preferably, a first fixed pin is arranged between the fixed frame and the worm gear, and the worm gear is rotatable on the fixed frame through the first fixed pin; a second fixed pin is arranged between the third clamping rod and the front end of the first clamping rod and the second clamping rod, i.e. the third clamping rod is movably connected to the front end of the first clamping rod and the second clamping rod.

[0008] Preferably, the front end of the third clamping rod is provided with a V-shaped clamping opening, and the V-shaped clamping opening has a V-shaped cross section, so that the V-shaped clamping opening can be clamped on the surface of the circular motor seat of different sizes through the V-shaped structure.

[0009] Preferably, the first threaded tube is provided with a threaded surface on the outer surface, and the outer end of the first threaded tube is provided with a ring-shaped handle fixedly connected thereto, and the inner end of the first threaded tube is provided with a first limiting piece fixedly connected thereto, and the position relationship between the first threaded tube and the fixed frame during the rotation of the first threaded tube is limited by the first limiting piece.

[0010] Preferably, a coil spring is arranged between the first threaded tube and the fixed frame, so that the first threaded tube has a restoring force during movement; and the first threaded tube and the worm gear can be matched to be self-locking.

[0011] Preferably, the elastic ball is adhered between the extraction plate and the extraction rod, and the extraction plate can rotate around the second fixed pin by extruding the elastic ball.

[0012] Preferably, the outer circle of the extraction plate is provided with a involute arc segment surface, and the relationship between the extraction rod and the bearing is locked by the fit between the involute arc segment surface and the inner circle of the bearing.

[0013] Preferably, a first movable pin is arranged between the T-shaped handle and the screw rod; during use, the T-shaped handle is rotated around the first movable pin to form a 90° angle with the screw rod; after use, the T-shaped handle is embedded in the screw rod by rotating around the first movable pin.

[0014] Preferably, the front end of the fixed frame is provided with a limiting plate and a third fixed pin, and the limiting plate is inserted into the fixed frame through the third fixed pin; the first threaded tube and the second threaded tube are respectively provided with a first limiting groove and a second limiting groove, and the rotation of the second threaded tube during the extension and retraction displacement movement is limited by the cooperation of the limiting plate and the second limiting groove.

[0015] Preferably, the screw rod is provided with a second limiting piece fixedly connected thereto, and the second limiting piece abuts against the end of the first threaded tube, i.e. the distance of the screw rod inserted into the first threaded tube is limited by the second limiting piece.

[0016] The beneficial effects of the application are that the bearing axis and the screw axis are on the same axis by the three extraction plates arranged at an angle of 120 degrees, and the three extraction plates arranged at an angle of 120 degrees can adapt to different bearing inner diameter sizes after compressing the elastic balls, and the design is ingenious; the V-shaped clamping port can clamp motor bases of different sizes, and the V-shaped clamping port clamps the motor base through the cooperation of the No. 1 threaded pipe and the worm wheel to achieve self-locking, and the use is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a perspective view of the multi-size coaxial motor bearing extraction device.

[0018] Figure 2 It is a perspective view of the multi-size coaxial motor bearing extraction device. Figure 1 It is a partial enlarged view of A in the middle.

[0019] Figure 3 It is a perspective view of the multi-size coaxial motor bearing extraction device. Figure 1 It is a partial enlarged view of B in the middle.

[0020] Figure 4 It is a perspective view of the multi-size coaxial motor bearing extraction device.

[0021] Figure 5 It is a perspective view of the multi-size coaxial motor bearing extraction device. Figure 4 It is a perspective view of the multi-size coaxial motor bearing extraction device.

[0022] Figure 6 It is a perspective view of the multi-size coaxial motor bearing extraction device. Figure 5 It is a partial enlarged view of D in the middle.

[0023] Figure 7 It is a perspective view of the multi-size coaxial motor bearing extraction device.

[0024] Figure 8 It is a perspective view of the multi-size coaxial motor bearing extraction device. Figure 7 It is a perspective view of the multi-size coaxial motor bearing extraction device.

[0025] Figure 9 It is a perspective view of the multi-size coaxial motor bearing extraction device. Figure 8 It is a partial enlarged view of F in the middle.

[0026] Figure 10 It is a perspective view of the multi-size coaxial motor bearing extraction device.

[0027] Figure 11 It is a perspective view of the multi-size coaxial motor bearing extraction device. Figure 10 It is a partial enlarged view of G in the middle.

[0028] In the diagram: 1. Fixed frame; 12. No. 2 movable pin; 13. No. 1 fixed pin; 14. Worm gear; 15. No. 1 clamping rod; 16. No. 2 clamping rod; 17. No. 3 clamping rod; 18. V-shaped clamp; 19. No. 1 limiting piece; 2. No. 1 threaded tube; 21. No. 1 limiting groove; 22. Ring throttle; 3. Coil spring; 4. Screw; 41. No. 1 movable pin; 42. Slotted throttle; 43. No. 2 limiting piece; 5. No. 2 threaded tube; 51. No. 2 limiting groove; 6. No. 3 fixed pin; 61. Limiting plate; 7. Pulling rod; 71. No. 2 fixed pin; 72. Elastic ball; 73. Pulling plate; 74. Involute arc surface; 8. Bearing; 9. Motor base. Detailed Implementation

[0029] To make the technical solution of the present invention clearer, the present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the terms "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the accompanying drawings, and the terms "inner" and "outer" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0030] like Figures 1-11 As shown, the multi-size coaxial motor bearing extraction device of the present invention comprises a fixed frame 1, a worm gear 14, an extraction rod 7, a bearing 8, and a motor base 9 as its main components. The fixed frame 1 has a first clamping rod 15, a second clamping rod 16, and a third clamping rod 17 on each side. The worm gear 14, the first clamping rod 15, the second clamping rod 16, and the third clamping rod 17 are arranged symmetrically around the middle surface of the fixed frame 1. The worm gear 14 is fixedly connected to the second clamping rod 16, and the third clamping rod 17 is simultaneously connected to the front ends of the first clamping rod 15 and the second clamping rod 16, forming a quadrilateral structure. A rotating rod is inserted through the middle of the fixed frame 1. The first threaded tube 2 has a hollow, through-hole-shaped interior and meshes with two worm gears 14 on both sides. The first threaded tube 2 contains a screw 4 and a second threaded tube 5. The thread of the second threaded tube 5 is located on its inner surface. The screw 4 passes through and meshes with the second threaded tube 5. A pulling rod 7 is fixedly connected to the front end of the second threaded tube 5. The axes of the first threaded tube 2, the second threaded tube 5, and the screw 4 are all on the same axis. The front end of the pulling rod 7 and the end of the screw 4 are respectively provided with a pulling plate 73 and a straight-line handle 42. The pulling plate 73 consists of three plates evenly arranged at a 120° angle around the front end of the pulling rod 7. A second fixing pin 71 and an elastic ball 72 are provided between the pulling plate 73 and the pulling rod 7.

[0031] In the embodiment, the fixed frame 1 is connected with the worm wheel 14 through a first fixed pin 13, and the worm wheel 14 is rotatable on the fixed frame 1 through the first fixed pin 13; the third clamping rod 17 is connected with the first clamping rod 15 and the second clamping rod 16 through a second movable pin 12 at the front end, that is, the third clamping rod 17 is movably connected with the first clamping rod 15 and the second clamping rod 16 at the front end.

[0032] In the embodiment, the third clamping rod 17 is provided with a V-shaped clamping opening 18 at the front end, and the V-shaped clamping opening 18 is in a V-shaped cross section, so that the V-shaped clamping opening 18 can be clamped on the surface of the circular motor base 9 of different sizes through the V-shaped structure.

[0033] In the embodiment, the first threaded pipe 2 is provided with a threaded surface on the outer surface, and the first threaded pipe 2 is provided with a ring-shaped handle 22 fixedly connected with the outer end of the fixed frame 1, and the first threaded pipe 2 is provided with a first limiting piece 19 fixedly connected with the inner end of the fixed frame 1, and the first limiting piece 19 is used to limit the position relationship between the first threaded pipe 2 and the fixed frame 1 during the rotation.

[0034] In the embodiment, the first threaded pipe 2 is provided with a coil spring 3 between the first threaded pipe 2 and the fixed frame 1, so that the first threaded pipe 2 has a restoring force during movement; and the first threaded pipe 2 and the worm wheel 14 can be matched to be self-locking.

[0035] In the embodiment, the elastic ball 72 is adhered between the extraction plate 73 and the extraction rod 7, and the extraction plate 73 can rotate around the second fixed pin 71 by extruding the elastic ball 72.

[0036] In the embodiment, the extraction plate 73 is provided with a involute arc segment surface 74 at the outer circle, and the involute arc segment surface 74 is used to lock the relationship between the extraction rod 7 and the bearing 8 by fitting with the inner circle of the bearing 8.

[0037] In the embodiment, the first threaded pipe 2 is provided with a coil spring 3 between the first threaded pipe 2 and the fixed frame 1, so that the first threaded pipe 2 has a restoring force during movement; and the first threaded pipe 2 and the worm wheel 14 can be matched to be self-locking.

[0038] In the embodiment, the fixed frame 1 is provided with a limiting plate 61 and a third fixed pin 6 at the front end, and the limiting plate 61 is inserted into the fixed frame 1 through the third fixed pin 6; the first threaded pipe 2 and the second threaded pipe 5 are respectively provided with a first limiting groove 21 and a second limiting groove 51, and the limiting plate 61 is matched with the second limiting groove 51 to limit the rotation of the second threaded pipe 5 during the extension and retraction displacement movement.

[0039] In the embodiment, the screw rod 4 is provided with the second limiting sheet 43 fixedly connected therewith, and the second limiting sheet 43 abuts against the end of the first threaded pipe 2, that is, the second limiting sheet 43 limits the distance of the screw rod 4 extending into the first threaded pipe 2.

[0040] In use, the annular knob 22 is rotated first, at this moment, the annular knob 22 drives the first threaded pipe 2 to rotate counterclockwise on the fixed frame 1 against the elastic force of the coil spring 3, and the first threaded pipe 2 drives the worm wheel 14 to rotate on the fixed frame 1 through the meshing with the worm wheel 14, further, the worm wheel 14 drives the second clamping rod 16 fixedly connected therewith to move, and the second clamping rod 16 cooperates with the first clamping rod 15 to drive the V-shaped clamping opening 18 at the front end of the third clamping rod 17 to open.

[0041] Further, the motor base 9 is placed into the V-shaped clamping opening 18, and then the annular knob 22 is loosened, under the action of the elastic force of the coil spring 3, the V-shaped clamping opening 18 can clamp the motor base 9 of different sizes, and the V-shaped clamping opening 18 clamps the motor base 9 through the cooperation of the first threaded pipe 2 and the worm wheel 14 to realize self-locking, so that the use is convenient.

[0042] Further, the pull-out rod 7 is pushed to make the pull-out plate 73 at the front end of the pull-out rod 7 inserted into the inner diameter of the bearing 8, at this moment, the involute arc segment surface 74 of the pull-out plate 73 abuts against the inner ring of the bearing 8 to lock the relationship between the pull-out rod 7 and the bearing 8, and the three pull-out plates 73 evenly arranged at an angle of 120° make the axis of the bearing 8 and the axis of the screw rod 4 on the same axis, and the three pull-out plates 73 evenly arranged at an angle of 120° can adapt to different sizes of the inner diameter of the bearing 8 after the compression of the elastic ball 72, so that the design is ingenious.

[0043] Further, the pull-out rod 7 is pushed to make the pull-out plate 73 at the front end of the pull-out rod 7 inserted into the inner diameter of the bearing 8, at this moment, the involute arc segment surface 74 of the pull-out plate 73 abuts against the inner ring of the bearing 8 to lock the relationship between the pull-out rod 7 and the bearing 8, and the three pull-out plates 73 evenly arranged at an angle of 120° make the axis of the bearing 8 and the axis of the screw rod 4 on the same axis, and the three pull-out plates 73 evenly arranged at an angle of 120° can adapt to different sizes of the inner diameter of the bearing 8 after the compression of the elastic ball 72, so that the design is ingenious.

[0044] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A multi-size coaxial motor bearing extraction device, characterized in that: The utility model provides a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No.

2. A multi-size coaxial bearing extraction device according to claim 1, characterized in that: The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No.

3. A multi-sized coaxial bearing extraction device according to claim 1, characterized in that: The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No.

4. A multi-size coaxial bearing extractor device as claimed in claim 1, characterized in that: The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one side of fixed frame is equipped with No. The utility model discloses a kind of motor fixing frame, including fixed frame, worm wheel, extraction rod, bearing and motor base, the utility model discloses one 5. A multi-sized coaxial bearing extraction device according to claim 1, wherein: The one-word type rotating handle is provided with a No. 1 movable pin; in use, the one-word type rotating handle rotates around the No. 1 movable pin and forms a 90° angle with the screw rod; after use, the one-word type rotating handle rotates around the No. 1 movable pin and is embedded into the screw rod.

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