Dual-purpose two-way clutch transmission shaft

Abstract

The present application relates to a hand and automatic two-way clutch transmission shaft. It includes a rotating shaft, and a retainer is sleeved on one end of the rotating shaft. The retainer includes a large-diameter section and a small-diameter section, the small-diameter section is uniformly processed with not less than three missing holes in the circumferential direction, the missing holes are all provided with rollers, and the outer side of the small-diameter section is sleeved with a gear ring. Its characteristics are that the outer periphery of the corresponding end of the rotating shaft is processed with not less than three planes at equal intervals, the number of the planes is equal to the number of the missing holes of the small-diameter section and one-to-one corresponding. The outer side of the large-diameter section of the retainer is connected with a manual operation section. The two sides of the missing hole are symmetrical eccentric circular arc shapes, the distance between the outer edges of the two circular arc sides is smaller than the distance between the inner edges. The outer edges of the two circular arc sides of the missing hole are all provided with steps. The outer periphery of the corresponding section of the rotating shaft of the small-diameter section of the retainer is provided with an annular groove, and the annular groove is provided with an outward expanding spring. The hand and automatic two-way clutch transmission shaft not only is not easy to wear and can generate a larger torque, but also has a safe and simple manual operation function.

Description

TECHNICAL FIELD

[0001] The present application relates to a bidirectional clutch transmission mechanism, in particular to a hand self-use bidirectional clutch transmission shaft. BACKGROUND

[0002] The patent application with the application number 2022110336085 filed on August 27, 2022 discloses a kind of electric motor bidirectional clutch transmission mechanism, and the application has been published on November 24, 2022.It includes motor and transmission box, the output shaft of motor extends in transmission box, and small gear is fixed concentrically on it.The transmission box has transmission shaft, and output gear is fixed concentrically on transmission shaft.Its characteristics are that the transmission shaft is sleeved with retainer, the retainer is composed of large diameter section and small diameter section connected integrally, the outer periphery of large diameter section has annular groove, spring clip is in annular groove, the tail end of spring clip is clamped on the output shaft of motor.The small diameter section is uniformly processed with not less than three missing holes along the circumference, and there are rollers in the missing holes.The small diameter section of the retainer is sleeved with gear ring, and the gear ring is engaged with the small gear on the output shaft of motor.The inner hole of gear ring is evenly divided into not less than three sections along the circumference, and each section is a continuous groove.The number of grooves in the inner hole of gear ring is the same as that of missing holes in the small diameter section of retainer and is one-to-one corresponding cooperation.The transmission mechanism is that after the gear ring rotates a small angle, the convex part at the connection of adjacent two grooves in the inner hole of gear ring will lock the roller, so as to lock the transmission shaft, and then the transmission shaft and output gear can be driven to rotate.In this structure, if you want to realize manual bidirectional clutch and ensure that gear ring and motor do not rotate, you can make one end of transmission shaft extend out of transmission box, and then rotate the transmission shaft manually.But the convex part at the connection of adjacent two grooves in the inner hole of gear ring is relatively sharp, easy to wear, the torque that can be generated is smaller, easy to slip and make the transmission fail, the failure rate is higher, and the service life is shorter.

[0003] The patent application with application number 2022233661912 filed by the applicant on December 15, 2022 improves the above-mentioned application, and the output end becomes an output gear ring, the inner hole of the output gear ring is a circular hole, the retainer and the roller structure are the same as those of the above-mentioned application, and the difference lies in that the outer periphery of the section of the transmission shaft corresponding to the small diameter section of the retainer is processed with a plurality of planes perpendicular to the transmission shaft at equal intervals, the number of the planes is equal to the number of the missing holes on the small diameter section of the retainer and one-to-one corresponding in position. That is, the driving end in the clutch structure becomes the transmission shaft, and whether it is the plane or the transition between the plane and the circular arc surface on the transmission shaft is relatively gentle, there is no sharp part, it is not easy to wear and tear, it can also generate a larger torque, and it can ensure that the transmission mechanism always operates effectively, reduces the failure rate and prolongs the service life. Although the transmission mechanism solves the problems of easy wear and tear and small torque in the above-mentioned application, because of the change of the clutch structure, if you want to manually operate the output end and ensure that the motor does not operate, you can only use the method of pulling the output gear ring, which is not only very difficult to operate, but also has safety hazards. SUMMARY

[0004] The purpose of the present application is to solve the problems of the prior art, and to provide a hand self-use two-way clutch transmission shaft which not only is not easy to wear and tear, can generate a larger torque, but also has the functions of safe and simple manual operation.

[0005] To solve the above problems, the following technical solutions are adopted:

[0006] The hand self-use two-way clutch transmission shaft of the present application comprises a rotating shaft, one end of the rotating shaft is sleeved with a retainer, and the two are in rotating fit. The retainer is composed of a large diameter section and a small diameter section connected in a concentric manner, the small diameter section is uniformly processed with not less than three missing holes in the circumferential direction, the missing holes are all provided with rollers, the rollers are all parallel to the rotating shaft, and the outer side of the small diameter section is sleeved with a gear ring. Its characteristics are that the outer periphery of one end of the rotating shaft corresponding to the retainer is processed with not less than three planes perpendicular to the rotating shaft at equal intervals, the number of the planes is equal to the number of the missing holes of the small diameter section and one-to-one corresponding in position. The outer side of the large diameter section of the retainer is connected in a concentric manner with a manual operation section. The two sides of the missing hole along the circumferential direction of the small diameter section of the retainer are symmetrical circular arc shapes, the centers of the two circular arc shapes are respectively deviated to the two sides of the center of the missing hole, and the distance between the outer edges of the two circular arc shapes is less than the distance between the inner edges. There are steps between the outer edges of the two circular arc shapes of the missing hole and the outer wall of the small diameter section. The outer periphery of the section of the rotating shaft corresponding to the small diameter section of the retainer has an annular groove, and the annular groove is provided with an outward expanding spring. The radial distance between the plane of the rotating shaft and the inner hole of the gear ring is greater than the outer diameter of the roller, and the radial distance between the circular arc surface of the rotating shaft and the inner hole of the gear ring is less than the outer diameter of the roller. One end of the gear ring abuts against the large diameter section, and the other end of the gear ring corresponds to the annular groove on the outer wall of the small diameter section, and the annular groove is provided with a circlip.

[0007] The end face of the one end of the holder is integrally connected with a positioning cylinder concentrically, and the outer diameter of the positioning cylinder is smaller than the outer diameter of the rotating shaft. The large-diameter section and the small-diameter section of the holder both have a center hole, and the diameter of the center hole of the small-diameter section is larger than that of the large-diameter section. The rotating shaft is processed with a flat end, which is inserted into the center hole of the small-diameter section and matched with it. The positioning cylinder of the end face of the rotating shaft is inserted into the center hole of the large-diameter section and matched with it.

[0008] The steps are parallel to the radial line of the holder passing through the center of the corresponding hole.

[0009] The end face of the small-diameter section of the holder has an axial blind hole, and the position close to the small-diameter section of the rotating shaft has a radial blind hole. A torsion spring is sleeved on the section of the rotating shaft outside the end face of the small-diameter section, one end of the torsion spring is inserted into the axial blind hole of the small-diameter section, and the other end is inserted into the radial blind hole of the rotating shaft.

[0010] The outer periphery of the manual operation section is a regular hexagon.

[0011] Or the manual operation section has a center hole, which is a regular hexagon.

[0012] In the above scheme, the number of holes uniformly processed along the circumference of the small-diameter section of the holder is five, and each hole has a roller. The number of flats processed at equal intervals on the outer periphery of the rotating shaft is five, and the five flats on the outer periphery of the rotating shaft correspond one-to-one to the five holes of the small-diameter section of the holder.

[0013] The above scheme has the following advantages:

[0014] The hand and self-use two-way clutch transmission shaft of the present application has not less than three planes which are perpendicular to the rotation shaft radially and are equidistantly machined on the outer periphery of the rotation shaft at one end corresponding to the retainer. The number of the planes is equal to the number of the holes in the small diameter section of the retainer and the positions of the planes correspond to the holes one by one. The outer side of the large diameter section of the retainer is integrally connected with a hand operating section. The two sides of the hole along the circumferential direction of the small diameter section of the retainer are symmetrical circular arc shapes, the centers of the two circular arc shapes deviate to the two sides of the center of the hole respectively, and the distance between the outer edges of the two circular arc shapes is smaller than the distance between the inner edges. There are steps between the outer edges of the two circular arc shapes and the outer wall of the small diameter section. The outer periphery of the rotation shaft corresponding to the small diameter section of the retainer has an annular groove, and the annular groove has an expanding spring. The radial distance between the plane of the rotation shaft and the inner hole of the gear ring is larger than the outer diameter of the roller, and the radial distance between the circular arc surface of the rotation shaft and the inner hole of the gear ring is smaller than the outer diameter of the roller. One end of the gear ring abuts against the large diameter section, and the outer wall of the small diameter section corresponding to the other end of the gear ring has an annular groove, and the annular groove has a snap spring. In use, the output end of an external motor is engaged with the gear ring in the hand and self-use two-way clutch transmission shaft of the present application through a gear, and the rotation shaft is used as an output shaft to perform two-way clutch transmission. When the external motor is started, the gear ring is driven to rotate, and under the action of the expanding spring, the roller is always pushed outward on the inner hole wall of the gear ring and rotates with the gear ring. At this time, the planes equidistantly machined on the outer periphery of the rotation shaft provide clearance and space for the initial rotation of the roller, so that the rotation shaft is temporarily stationary. When the gear ring and the roller rotate by a certain angle, the roller rotates to the position near the circular arc surface on the rotation shaft, and due to the reduction of the clearance and space, the roller is clamped between the inner wall of the gear ring and the rotation shaft, so that they are locked, the rotation shaft rotates with the gear ring, and power is transmitted. The reverse is also true. When manual operation is needed, the hand operating section of the retainer can be rotated by using an auxiliary tool or manually, and when the small diameter section of the retainer rotates by a certain angle, the circular arc side of the hole on one side of the retainer will hold the roller. Since the distance between the outer edges of the two circular arc sides is smaller than the distance between the inner edges, and there are steps between the outer edges of the two circular arc sides and the outer wall of the small diameter section, the steps can hold the roller with the circular arc side and make the outer edge of the roller separate from the inner wall of the gear ring. Then, when the retainer continues to rotate by a certain angle, the roller presses the rotation shaft, so that the retainer and the rotation shaft are locked, the rotation shaft rotates with the retainer, and the reverse is also true. At this time, since the roller has separated from the inner wall of the gear ring, the gear ring is stationary. It can be seen that the hand and self-use two-way clutch transmission shaft of the present application eliminates the sharp protruding part in the clutch mechanism of the prior art, which is easy to wear and has a small torque. When manual operation is needed, there is a dedicated manual operating part, i.e. the hand operating section of the retainer, which does not need to touch the internal components of the clutch mechanism to realize safe and simple manual operation, and meets the design requirements of the hand and self-use two-way clutch. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1is a structural schematic diagram of a hand and automatic dual-purpose bidirectional clutch transmission shaft of the present application;

[0016] Figure 2 is Figure 1 is a bottom view of the retainer in the middle;

[0017] Figure 3 is Figure 1 is a schematic view of A-A direction in the middle;

[0018] Figure 4 is a schematic view of the action of the gear ring, the roller, the retainer and the rotating shaft when electrically driven;

[0019] Figure 5 is a schematic view of the action of the gear ring, the roller, the retainer and the rotating shaft when manually operated;

[0020] Figure 6 is a schematic view of the action of the gear ring, the roller, the retainer and the rotating shaft when manually operated. DETAILED DESCRIPTION

[0021] The present application is further described in detail below in conjunction with the accompanying drawings.

[0022] As Figure 1 , Figure 2 and Figure 3As shown, the hand-operated and automatic bidirectional clutch transmission shaft of the present application comprises a rotating shaft 1, one end of the rotating shaft 1 is sleeved with a retainer, and the two are in rotating fit. The retainer is composed of a large-diameter section 72 and a small-diameter section 73 which are connected in a concentric manner, the small-diameter section 73 is uniformly processed with not less than three missing holes 75 in the circumferential direction, the missing holes 75 are all provided with rollers 4, the rollers 4 are all parallel to the rotating shaft 1, and the outer side of the small-diameter section 73 is sleeved with a gear ring 5. The outer side of the large-diameter section 72 of the retainer is connected in a concentric manner with a hand-operated section 71. The two sides of the missing holes 75 along the circumferential direction of the small-diameter section 73 are symmetrical circular arcs, the centers of the two circular arc sides 751 are respectively deviated to the two sides of the center of the missing hole 75, and the distance between the outer edges of the two circular arc sides 751 is smaller than the distance between the inner edges. There are steps 752 between the outer edges of the two circular arc sides 751 and the outer wall of the small-diameter section 73. The steps 752 are all parallel to the radial line of the retainer passing through the center of the corresponding missing hole 75. The outer periphery of the corresponding end of the rotating shaft 1 of the retainer is processed with not less than three planes 13 which are perpendicular to the radial direction of the rotating shaft 1 and are equidistant, the number of the planes 13 is equal to the number of the missing holes 75 of the small-diameter section 73 and the positions are one-to-one corresponding. The outer periphery of the corresponding section of the rotating shaft 1 of the retainer has an annular groove, and the annular groove is provided with an outwardly expanding spring 6. The radial distance between the plane 13 of the rotating shaft 1 and the inner hole of the gear ring 5 is greater than the outer diameter of the roller 4, and the radial distance between the circular arc surface of the rotating shaft 1 and the inner hole of the gear ring 5 is smaller than the outer diameter of the roller 4. One end of the gear ring 5 abuts against the large-diameter section 72, and the other end of the gear ring 5 is provided with an annular groove on the outer wall of the corresponding small-diameter section 73, and the annular groove is provided with a circlip 3.

[0023] In the present application, a positioning cylinder 12 is connected in a concentric manner on the end face of the corresponding retainer of the rotating shaft 1, and the outer diameter of the positioning cylinder 12 is smaller than the outer diameter of the rotating shaft 1. The large-diameter section 72 and the small-diameter section 73 of the retainer are both provided with a center hole, the diameter of the center hole of the small-diameter section 73 is greater than the diameter of the center hole of the large-diameter section 72, one end of the plane 13 processed on the outer periphery of the rotating shaft 1 extends into the center hole of the small-diameter section 73 and is matched with the center hole, and the positioning cylinder 12 on the end face of the rotating shaft 1 extends into the center hole of the large-diameter section 72 and is matched with the center hole. The positioning cylinder 12 connected in a concentric manner on the end face of the rotating shaft 1 is matched with the center hole of the large-diameter section 72 of the retainer, which is beneficial to improving the positioning accuracy when the rotating shaft 1 is assembled and connected with the retainer and the stability during operation

[0024] The end face of the small diameter section 73 of the retainer has an axial blind hole 74, the rotating shaft 1 has a radial blind hole 11 at the position close to the small diameter section 73, and the rotating shaft 1 at the section outside the end face of the small diameter section 73 is sleeved with a torsion spring 2, one end of the torsion spring 2 extends into the axial blind hole 74 of the small diameter section 73, and the other end extends into the radial blind hole 11 of the rotating shaft 1. The main purpose of arranging the torsion spring 2 between the retainer and the rotating shaft 1 is to reset, when the device is stopped and the driving force disappears, the relative position of the retainer and the rotating shaft 1 can be restored to the initial position under the action of the torsion spring 2, as shown in Figure 3

[0025] The outer periphery of the manual operation section 71 is a regular hexagon, which facilitates the use of a wrench for operation during manual operation. Alternatively, the manual operation section 71 has a central hole which is a regular hexagon, which facilitates the use of a hexagonal nail for operation during manual operation. The outer periphery of the manual operation section 71 is hexagonal and the central hole is a regular hexagon, which can increase the selection of auxiliary tools during manual operation and improve the convenience of operation.

[0026] In the embodiment, the number of the missing holes 75 uniformly processed along the circumference of the small diameter section 73 of the retainer is five, and each missing hole 75 has a roller 4. The number of the planes 13 uniformly processed at equal intervals on the outer periphery of the rotating shaft 1 is five, and the five planes 13 on the outer periphery of the rotating shaft 1 correspond to the five missing holes 75 of the small diameter section 73 of the retainer one by one. Since the two sides of the missing hole 75 are eccentric circular arcs, compared with the scheme in the background art, the length of the missing hole 75 along the circumference of the retainer is elongated, in order not to affect the strength of the small diameter section 73 of the retainer and to ensure the timely and stable clutching action, after reasonable calculation, the best scheme of the cooperation of the five missing holes 75 of the small diameter section 73 of the retainer and the five planes 13 on the outer periphery of the rotating shaft 1 is obtained.

[0027] In use, the gear ring 5 in the hand-automatic dual-purpose bidirectional clutch transmission shaft of the present application is engaged with the output gear of an external motor, and the rotating shaft 1 is used as an output shaft, so that hand-automatic dual-purpose bidirectional clutch transmission can be performed.

[0028] As Figure 4 ​As shown, the peripheral gear 5 is rotated clockwise by the peripheral motor, and the motor drives the peripheral gear 5 to rotate at the start. Under the action of the outward expanding spring 6, the roller 4 is always pushed outward on the inner hole wall of the peripheral gear 5 and rotates with the peripheral gear 5. At this time, the equidistantly processed planes 13 on the outer periphery of the rotating shaft 1 provide clearance and space for the initial rotation of the roller 4, so that the rotating shaft 1 is temporarily stationary. When the peripheral gear 5 and the roller 4 rotate by a certain angle, the roller 4 rotates to the position close to the circular arc surface on the rotating shaft 1, and due to the reduction of the clearance and space, the roller 4 is clamped between the inner wall of the peripheral gear 5 and the rotating shaft 1, thereby locking them, so that the rotating shaft 1 rotates with the peripheral gear 5 to transmit power, and the reverse is also true. In the initial rotation of the roller 4 with the peripheral gear 5, the outer edge of the arc-shaped edge 751 of the small-diameter section 73 of the retainer with the missing hole 75 has a step 752, which limits the roller 4 from entering the range of the arc-shaped edge 751, so that the roller 4 can push the retainer to rotate with the peripheral gear 5 by the connecting point of the arc-shaped edge 751 and the step 752 of the missing hole 75.

[0029] When the retainer is operated manually to rotate clockwise, the outer periphery of the regular hexagonal hand-operating section 71 of the retainer can be clamped by a wrench, or a hexagonal pin can be inserted into the center hole of the regular hexagonal hand-operating section 71 of the retainer, and the wrench or the hexagonal pin can be pulled to drive the retainer to rotate. As shown in Figure 5 As shown, when the retainer is initially rotated, the peripheral gear 5, the roller 4 and the rotating shaft 1 all remain stationary. When the small-diameter section 73 of the retainer rotates by a certain angle, the arc-shaped edge 751 on one side of the missing hole 75 will hold the roller 4. Due to the distance between the outer edges of the two arc-shaped edges 751 of the missing hole 75 being smaller than the distance between the inner edges, and the outer edges of the arc-shaped edges 751 all having steps 752, the steps 752 can drive the roller 4 to press the outward expanding spring 6 while the arc-shaped edges 751 hold the roller 4, so that the outer edge of the roller 4 is separated from the inner wall of the peripheral gear 5, and only the roller 4 rotates with the retainer. As shown in Figure 6 As shown, then the retainer drives the roller 4 to continue to rotate by a certain angle, the roller 4 presses the rotating shaft 1, so that the retainer and the rotating shaft 1 are locked, and the rotating shaft 1 rotates with the retainer, and the reverse is also true. During the entire operation process, the peripheral gear 5 has no driving force to push, so it remains stationary.

[0030] Therefore, the hand-operated and self-operated bidirectional clutch transmission shaft can eliminate the sharp protruding part in the clutch mechanism in the prior art, which is easy to wear and has a small torque, and can ensure that when the hand-operated operation is performed, there is a dedicated hand-operating part, i.e., the hand-operating section 71 of the retainer, without touching the internal components of the clutch mechanism, so that the safe and simple hand-operating function is realized, and the design requirement of the hand-operated and self-operated bidirectional clutch is met.

Claims

1. A hand and automatic bidirectional clutch transmission shaft, comprising a rotating shaft (1), one end of the rotating shaft (1) is sleeved with a retainer, and the two are in rotating fit; the retainer is composed of a large-diameter section (72) and a small-diameter section (73) connected in a concentric manner, the small-diameter section (73) is uniformly processed with not less than three missing holes (75) in the circumferential direction, the missing holes (75) are each provided with a roller (4), the roller (4) is parallel to the rotating shaft (1), and the outer side of the small-diameter section (73) is sleeved with a gear ring (5); characterized in that, The outer periphery of one end of the rotating shaft (1) corresponding to the holder is processed with not less than three planes (13) perpendicular to the radial direction of the rotating shaft (1) at equal intervals, the number of the planes (13) is equal to the number of the holes (75) in the small-diameter section (73) and the positions are one-to-one corresponding; the outer side of the large-diameter section (72) of the holder is concentrically and integrally connected with a manually operated section (71); the holes (75) along the circumferential direction of the small-diameter section (73) of the holder are symmetrical circular arc shapes, the centers of the two circular arc sides (751) are deviated to the two sides of the center of the hole (75) respectively, the distance between the outer edges of the two circular arc sides (751) is smaller than the distance between the inner edges; there are steps (752) between the outer edges of the two circular arc sides (751) and the outer wall of the small-diameter section (73); the outer periphery of the section of the rotating shaft (1) corresponding to the small-diameter section (73) of the holder has an annular groove, and the annular groove has an outward spring (6); the radial distance between the plane (13) of the rotating shaft (1) and the inner hole of the gear ring (5) is greater than the outer diameter of the roller (4), and the radial distance between the circular arc surface of the rotating shaft (1) and the inner hole of the gear ring (5) is smaller than the outer diameter of the roller (4); one end of the gear ring (5) abuts against the large-diameter section (72), and the other end of the gear ring (5) has an annular groove on the outer wall of the corresponding small-diameter section (73), and the annular groove has a circlip (3); The end surface of the small-diameter section (73) of the holder has an axial blind hole (74), the position close to the small-diameter section (73) of the rotating shaft (1) has a radial blind hole (11), the section of the rotating shaft (1) on the outer side of the end surface of the small-diameter section (73) is sleeved with a torsion spring (2), one end of the torsion spring (2) extends into the axial blind hole (74) of the small-diameter section (73) and the other end extends into the radial blind hole (11) of the rotating shaft (1); The end surface of one end of the rotating shaft (1) corresponding to the holder is concentrically and integrally connected with a positioning cylinder (12), and the outer diameter of the positioning cylinder (12) is smaller than the outer diameter of the rotating shaft (1); the large-diameter section (72) and the small-diameter section (73) of the holder both have central holes, the diameter of the central hole of the small-diameter section (73) is greater than the diameter of the central hole of the large-diameter section (72), and the section of the rotating shaft (1) processed with the plane (13) on the outer periphery extends into the central hole of the small-diameter section (73) and they are adapted to each other, and the positioning cylinder (12) of the end surface of the rotating shaft (1) extends into the central hole of the large-diameter section (72) and they are adapted to each other.

2. The dual-purpose bidirectional clutch transmission shaft of claim 1, wherein, The steps (752) are all parallel to the radial line of the holder passing through the center of the corresponding hole (75).

3. The dual-purpose bidirectional clutch transmission shaft of claim 1, wherein, The outer periphery of the manually operated section (71) is a regular hexagon.

4. The dual-purpose bidirectional clutch transmission shaft of claim 1, wherein, The manually operated section (71) has a central hole which is a regular hexagon.

5. The dual-purpose bidirectional clutch transmission shaft according to any one of claims 1 to 4, characterized in that, The number of the holes (75) uniformly processed along the circumferential direction of the small-diameter section (73) of the holder is five, and each hole (75) has a roller (4); the number of the planes (13) processed at equal intervals on the outer periphery of the rotating shaft (1) is five, and the five planes (13) on the outer periphery of the rotating shaft (1) are one-to-one corresponding to the five holes (75) of the small-diameter section (73) of the holder. The end surface of the small-diameter section (73) of the holder has an axial blind hole (74), the position close to the small-diameter section (73) of the rotating shaft (1) has a radial blind hole (11), the section of the rotating shaft (1) on the outer side of the end surface of the small-diameter section (73) is sleeved with a torsion spring (2), one end of the torsion spring (2) extends into the axial blind hole (74) of the small-diameter section (73) and the other end extends into the radial blind hole (11) of the rotating shaft (1); The end surface of one end of the rotating shaft (1) corresponding to the holder is concentrically and integrally connected with a positioning cylinder (12), and the outer diameter of the positioning cylinder (12) is smaller than the outer diameter of the rotating shaft (1); the large-diameter section (72) and the small-diameter section (73) of the holder both have central holes, the diameter of the central hole of the small-diameter section (73) is greater than the diameter of the central hole of the large-diameter section (72), and the section of the rotating shaft (1) processed with the plane (13) on the outer periphery extends into the central hole of the small-diameter section (73) and they are adapted to each other, and the positioning cylinder (12) of the end surface of the rotating shaft (1) extends into the central hole of the large-diameter section (72) and they are adapted to each other. The steps (752) are all parallel to the radial line of the holder passing through the center of the corresponding hole (75). The outer periphery of the manually operated section (71) is a regular hexagon. The manually operated section (71) has a central hole which is a regular hexagon. The number of the holes (75) uniformly processed along the circumferential direction of the small-diameter section (73) of the holder is five, and each hole (75) has a roller (4); the number of the planes (13) processed at equal intervals on the outer periphery of the rotating shaft (1) is five, and the five planes (13) on the outer periphery of the rotating shaft (1) are one-to-one corresponding to the five holes (75) of the small-diameter section (73) of the holder.

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