A new type of automatic uncoupling device for metallurgical vehicles

Abstract

The present invention discloses a novel automatic hook disengaging device for metallurgical vehicles, which comprises a bracket, a hinge point seat, a rotating shaft, a reduction motor, a manual and automatic separation device, and a limit detection device; the bracket has an accommodating space; the hinge point seat is arranged beside the bracket, and the hinge point seat comprises a main body part and a cover plate part; the manual and automatic separation device comprises a clutch gear, a clutch hollow shaft and a driving gear; the limit detection device comprises a limit component, a connecting shaft, a limit contact plate, a locking nut and a spring; by designing the hinge point seat to be composed of a main body part and a cover plate part, designing the manual and automatic separation device to be composed of a clutch gear, a clutch hollow shaft and a driving gear, and then cooperating with the limit detection device composed of a limit component, a connecting shaft, a limit contact plate, a locking nut and a spring, the structure is simple, the stability and reliability are high, and the installation and maintenance are convenient, which brings convenience to the use.

Description

Technical Field

[0001] The present invention relates to the technical field of metallurgical vehicles, and in particular to a new type of automatic uncoupling device for metallurgical vehicles. Background Art

[0002] As is well known, the turnover or transportation of goods or production raw materials often requires the use of a metallurgical vehicle with multiple carriages, and such a metallurgical vehicle generally moves on a fixed track. This metallurgical vehicle is equipped with a coupling and uncoupling device (an uncoupling device and a coupling device). Among them, the main function of the coupler is to realize the connection between metallurgical vehicles, transmit traction and impact forces, and keep a certain distance between metallurgical vehicles.

[0003] Currently, railway ordinary couplers are generally selected for metallurgical vehicles. During the operation process, the uncoupling action of the coupler must be manually completed by workers on the operation site. However, under the trend of the rapid development of intelligent manufacturing technology, manually performing the uncoupling operation of metallurgical vehicles makes such an operation process appear too primitive, resulting in low operation efficiency. In addition, due to human factors, mistakes may occur during the process of coupling and uncoupling. If the uncoupling is not successful, on the one hand, it is necessary to perform the uncoupling again, and on the other hand, it will delay the work process and even cause production or transportation stoppage; at the same time, manually performing the coupling and uncoupling actions of metallurgical vehicles also poses certain dangers, especially in dangerous places such as high-temperature furnaces and steelmaking ladle turntables with large-scale high-risk equipment. The locomotive often needs to be connected or separated from the torpedo car or molten iron ladle car. Once a personnel casualty accident occurs, the loss will be significant.

[0004] Therefore, there are currently uncoupling devices that integrate manual and automatic functions, which facilitate the use of users. However, the uncoupling devices in the prior art generally have complex structures, are inconvenient to install and maintain, and have poor stability and reliability. Therefore, it is necessary to improve the current uncoupling devices. Summary of the Invention

[0005] In view of this, in view of the deficiencies of the prior art, the main purpose of the present invention is to provide a new type of automatic uncoupling device for metallurgical vehicles, which has a simple structure, is convenient to install and maintain, and has high stability and reliability.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A new type of automatic uncoupling device for metallurgical vehicles includes a bracket, a hinge point seat, a rotating shaft, a reduction motor, a manual and automatic separation device, and a limit detection device;

[0008] The bracket has an accommodating space;

[0009] The hinge point seat is arranged beside the bracket. The hinge point seat includes a main body part and a cover plate part. There is a groove on the main body part, and a first semi-axis groove is recessed on the bottom surface of the groove. The cover plate part is embedded in the groove and is detachably installed and connected to the main body part through a connecting bolt. A second semi-axis groove is recessed on the cover plate part, and the second semi-axis groove and the first semi-axis groove enclose a first shaft hole.

[0010] The rotating shaft is adapted to the first shaft hole and is rotatably arranged in the first shaft hole. A coupler lock pin is arranged at one end of the rotating shaft, and a handle is provided at the other end of the rotating shaft.

[0011] The reduction motor is fixed on the bracket.

[0012] The manual and automatic separation device includes a clutch gear, a clutch hollow shaft, and a driving gear. The clutch gear is rotatably arranged in the accommodating space. An installation hole is provided on the clutch gear. Two first clutch meshing teeth are radially symmetrically protruded on the inner wall of the installation hole. Two arc-shaped chutes are formed between the two first clutch meshing teeth. The clutch hollow shaft is fixed on the output shaft of the reduction motor. The clutch hollow shaft is arranged in the installation hole. Two second clutch meshing teeth are radially symmetrically protruded on the outer wall of the clutch hollow shaft. The two second clutch meshing teeth are respectively located in the corresponding arc-shaped chutes and move back and forth. The driving gear is rotatably arranged in the accommodating space. The driving gear meshes with the clutch gear and is fixedly connected to the rotating shaft.

[0013] The limit detection device includes a limit component, a connecting shaft, a limit touch plate, a locking nut, and a spring. The limit component is arranged on the bracket, and two limit components are stacked inside and outside. The connecting shaft is installed on the clutch hollow shaft. There are two limit touch plates. Both limit touch plates are sleeved on the connecting shaft and are axially movable back and forth along the connecting shaft and rotatably arranged around the connecting shaft. The two limit touch plates are respectively located beside the two limit components. The two limit touch plates touch or leave the corresponding limit components as the connecting shaft rotates synchronously. The locking nut is screwed on the outer end of the connecting shaft and is axially adjustable in position. The spring is sleeved on the connecting shaft, and the two ends of the spring respectively abut between the locking nut and the outermost limit touch plate. The spring urges the two limit touch plates to axially move inward.

[0014] Preferably, the driving gear includes a gear seat and a U-shaped gear. The gear seat includes a first seat body and a second seat body. The first seat body and the second seat body are detachably installed and connected through a first bolt. The first seat body and the second seat body are joined together to enclose a second shaft hole. The U-shaped gear is detachably installed and fixed on one side surface of the gear seat through a second bolt. The U-shaped gear has a U-shaped groove, and the U-shaped groove is directly connected to the second shaft hole. The rotating shaft is located in the U-shaped groove and the second shaft hole and is fixedly connected to the gear seat.

[0015] Preferably, a first through hole is formed in the first base body. Correspondingly, a first threaded hole is formed in the second base body, and the first bolt passes through the first through hole and is threadedly connected and fixed to the first threaded hole.

[0016] Preferably, second through holes are formed through both side surfaces of the U-shaped gear. Correspondingly, a second threaded hole is formed in the first base body, and the second bolt passes through the second through holes and is threadedly connected and fixed to the second threaded hole.

[0017] Preferably, a third shaft hole is formed in the clutch hollow shaft, and a keyway is formed in the inner wall of the third shaft hole.

[0018] Preferably, the main body member includes a fixed portion and an installation portion integrally formed and connected. The embedding groove is located on the installation portion, and the cover plate member is stacked on the installation portion and is installed and connected to the installation portion through connecting bolts.

[0019] Preferably, two threaded holes are formed in the installation portion, and the two threaded holes are respectively located on both sides of the first half shaft groove. Two through holes are formed in the cover plate member, and the two through holes are respectively located on both sides of the second half shaft groove. The two connecting bolts respectively pass through the corresponding through holes and are threadedly connected and fixed to the corresponding threaded holes.

[0020] Preferably, a plurality of fixing holes for the fixing bolts to pass through are formed in the fixed portion.

[0021] Preferably, the bracket includes a mounting base and a mounting plate. The accommodating space is located on the mounting base, the reduction motor is fixed to the mounting base, the mounting plate is mounted on the mounting base, and the aforementioned limiting assembly is arranged on the mounting plate.

[0022] Preferably, a sleeve is sleeved on the connecting shaft. The sleeve is axially movable back and forth along the connecting shaft and is located between the two limiting contact plates. The connecting shaft includes a main body section and a screw rod section. The inner end of the main body section is connected to the outer end of the clutch hollow shaft. The aforementioned two limiting contact plates are sleeved on the main body section. The screw rod section extends integrally outward from the outer end of the main body section, and the aforementioned locking nut is threadedly connected to the screw rod section.

[0023] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solutions:

[0024] By designing the hinge point seat to be composed of a main body member and a cover plate member, designing the manual and automatic separation device to be composed of a clutch gear, a clutch hollow shaft and a driving gear, and then cooperating with the limiting detection device composed of a limiting assembly, a connecting shaft, limiting contact plates, a locking nut and a spring, the structure is simple, the stability and reliability are high, and the installation and maintenance are convenient, bringing convenience to the use. Description of the Drawings

[0025] Figure 1It is a three-dimensional schematic diagram of the usage state of the preferred embodiment of the present invention;

[0026] Figure 2 It is a three-dimensional schematic diagram of the preferred embodiment of the present invention;

[0027] Figure 3 It is a three-dimensional schematic diagram of the limit detection device and the reduction motor in the preferred embodiment of the present invention;

[0028] Figure 4 It is a cross-sectional schematic diagram of the manual and automatic separation device in the preferred embodiment of the present invention;

[0029] Figure 5 It is a three-dimensional schematic diagram of the clutch hollow shaft in the preferred embodiment of the present invention;

[0030] Figure 6 It is a three-dimensional schematic diagram of the clutch gear in the preferred embodiment of the present invention;

[0031] Figure 7 It is a three-dimensional schematic diagram of the hinge point seat in the preferred embodiment of the present invention;

[0032] Figure 8 It is an exploded schematic diagram of the hinge point seat in the preferred embodiment of the present invention;

[0033] Figure 9 It is a three-dimensional schematic diagram of the driving gear in the preferred embodiment of the present invention;

[0034] Figure 10 It is an assembly drawing of the gear seat in the preferred embodiment of the present invention;

[0035] Figure 11 It is an exploded view of the gear seat in the preferred embodiment of the present invention.

[0036] Explanation of the attached drawing reference numerals:

[0037] 10. Bracket 11. Mounting seat

[0038] 12. Mounting plate 101. Accommodating space

[0039] 20. Hinge point seat 21. Main body part

[0040] 211. Fixed part 212. Mounting part

[0041] 22. Cover plate part 23. Fixed bolt

[0042] 201. Embedded groove 202. First half shaft groove

[0043] 203. Second half shaft groove 204. Fixed hole

[0044] 205. Screw hole 206. Connection hole

[0045] 207, through hole 30, rotating shaft

[0046] 40, reduction motor 50, manual and automatic separation device

[0047] 51, clutch gear 511, mounting hole

[0048] 512, first clutch engaging tooth 513, arc-shaped sliding groove

[0049] 52, clutch hollow shaft 521, second clutch engaging tooth

[0050] 522, third shaft hole 523, keyway

[0051] 53, drive gear 531, gear seat

[0052] 5311, first seat body 5312, second seat body

[0053] 5313, first bolt 532, U-shaped gear

[0054] 533, second bolt 501, second shaft hole

[0055] 502, U-shaped groove 503, first through hole

[0056] 504, first screw hole 505, second through hole

[0057] 506, second screw hole 60, limit detection device

[0058] 61, limit component 62, connecting shaft

[0059] 621, main body section 622, screw rod section

[0060] 63, limit contact plate 64, locking nut

[0061] 65, spring 66, sleeve

[0062] 71, coupler lock pin 72, handle Detailed implementation manners

[0063] Please refer to Figures 1 to 11 as shown, which shows the specific structure of the preferred embodiment of the present invention, including a bracket 10, a hinge point seat 20, a rotating shaft 30, a reduction motor 40, a manual and automatic separation device 50, and a limit detection device 60.

[0064] The bracket 10 has a receiving space 101; the bracket 10 includes a mounting seat 11 and a mounting plate 12, the receiving space 101 is located on the mounting seat 11, and the mounting plate 12 is mounted on the mounting seat 11.

[0065] The hinge point seat 20 is arranged beside the bracket 10. The hinge point seat 20 includes a main body part 21 and a cover plate part 22. A groove 201 is formed on the main body part 21, and a first semi-axis groove 202 is recessed on the bottom surface of the groove 201. The cover plate part 22 is embedded in the groove 201 and is detachably installed and connected to the main body part 21 through a connecting bolt (not shown in the figure). A second semi-axis groove 203 is recessed on the cover plate part 22. The second semi-axis groove 203 and the first semi-axis groove 201 enclose and form a first shaft hole. In this embodiment, the main body part 21 includes a fixed part 211 and an installation part 212 which are integrally formed and connected. The groove 201 is located on the installation part 212. A plurality of fixing holes 204 for the fixing bolts 23 to pass through are formed on the fixed part 211. Two screw holes 205 are formed on the installation part 212, and the two screw holes 205 are respectively located on both sides of the first semi-axis groove 202. Two connecting holes 206 are formed through both sides of the installation part 212, and the two connecting holes 206 are respectively located on both sides of the first semi-axis groove 202. The main body part 21 and the cover plate part 22 are combined to form a square column structure. The cover plate part 22 is stacked on the installation part 212 and is installed and connected to the installation part 212 through a connecting bolt. Moreover, two through holes 207 are formed on the cover plate part 22, and the two through holes 207 are respectively located on both sides of the second semi-axis groove 203. The two connecting bolts respectively pass through the corresponding through holes 207 and are screwed and connected and fixed to the corresponding screw holes 205.

[0066] The rotating shaft 30 is adapted to the first shaft hole and is rotatably arranged in the first shaft hole. A coupler lock pin 71 is arranged at one end of the rotating shaft 30, and a handle 72 is arranged at the other end of the rotating shaft 30.

[0067] The reduction motor 40 is fixed on the bracket 10. In this embodiment, the reduction motor 40 is fixed on the mounting seat 11.

[0068] The manual and automatic separation device 50 includes a clutch gear 51, a clutch hollow shaft 52 and a driving gear 53. The clutch gear 51 is rotatably arranged in the accommodating space 101. An installation hole 511 is formed on the clutch gear 51. Two first clutch engaging teeth 512 are radially symmetrically protruded on the inner wall of the installation hole 511. Two arc-shaped chutes 513 are formed between the two first clutch engaging teeth 512. The clutch hollow shaft 52 is fixed on the output shaft of the reduction motor 40. The clutch hollow shaft 52 is arranged in the installation hole 511. Two second clutch engaging teeth 521 are radially symmetrically protruded on the outer wall of the clutch hollow shaft 52. The two second clutch engaging teeth 521 are respectively movably arranged back and forth in the corresponding arc-shaped chutes 513. The driving gear 53 is rotatably arranged in the accommodating space 101. The driving gear 53 meshes with the clutch gear 51 and is fixedly connected to the rotating shaft 30.

[0069] In this embodiment, a third shaft hole 522 is formed in the clutch hollow shaft 52, and a keyway 523 is formed in the inner wall of the third shaft hole 522. The output shaft of the reduction motor 40 is inserted into the third shaft hole 522 and fixedly connected by inserting a pin key into the keyway 523. The driving gear 53 includes a gear seat 531 and a U-shaped gear 532. The gear seat 531 includes a first seat body 5311 and a second seat body 5312. The first seat body 5311 and the second seat body 5312 are detachably installed and connected by a first bolt 5313. The first seat body 5311 and the second seat body 5312 are joined and enclosed to form a second shaft hole 501. The U-shaped gear 532 is detachably installed and fixed on one side surface of the gear seat 531 by a second bolt 533. The U-shaped gear 532 has a U-shaped groove 502, and the U-shaped groove 502 is connected to the second shaft hole 501 in a facing manner. The rotating shaft 30 is located in the U-shaped groove 502 and the second shaft hole 501 and is fixedly connected to the gear seat 531. Moreover, a first through hole 503 is formed in the first seat body 5311. Correspondingly, a first screw hole 504 is formed in the second seat body 5312. The first bolt 5313 passes through the first through hole 503 and is screwed and connected to the first screw hole 504 for fixation. Second through holes 505 are formed through both side surfaces of the U-shaped gear 532. Correspondingly, second screw holes 506 are formed in the first seat body 5311. The second bolt 533 passes through the second through holes 505 and is screwed and connected to the second screw holes 506 for fixation.

[0070] The limit detection device 60 includes a limit component 61, a connecting shaft 62, a limit contact plate 63, a locking nut 64, and a spring 65. The limit component 61 is arranged on the bracket 10. Two limit components 61 are arranged in an inner and outer stacked manner. In this embodiment, the limit component 61 is arranged on the mounting plate 12. The connecting shaft 62 is installed on the clutch hollow shaft 52. There are two limit contact plates 63. Both limit contact plates 63 are sleeved on the connecting shaft 62 and are arranged to be axially movable back and forth along the connecting shaft 62 and rotatable around the connecting shaft 62. The two limit contact plates 63 are respectively located beside the two limit components 61. The two limit contact plates 63 touch or leave the corresponding limit components 61 as the connecting shaft 62 rotates synchronously. The locking nut 64 is screwed to the outer end of the connecting shaft 62 and is arranged to be axially adjustable in position. The spring 65 is sleeved on the connecting shaft 62. The two ends of the spring 65 respectively abut between the locking nut 64 and the outermost limit contact plate 63. The spring 65 urges the two limit contact plates 63 to axially move inward.

[0071] In this embodiment, a sleeve 66 is sleeved on the connecting shaft 62. The sleeve 66 is axially movable back and forth along the connecting shaft 62 and is located between the two limit contact plates 63. The connecting shaft 62 includes a main body section 621 and a screw section 622. The inner end of the main body section 621 is connected to the outer end of the clutch hollow shaft 52. The two limit contact plates 63 are sleeved on the main body section 621. The screw section 622 extends integrally outward from the outer end of the main body section 621. The locking nut 64 is screwed to the screw section 622.

[0072] The working principle of this embodiment is described in detail as follows:

[0073] The hinge point seat 20 and the bracket 10 are fixed into a rigid structure by bolts. The U-shaped gear 532 and the gear seat 531 are fixed into a rigid structure by the second bolt 533 and rotate relative to the hinge point seat 20. The reduction motor 40 and the bracket 10 are fixed into a rigid structure by bolts. The clutch gear 51 is assembled with the clutch hollow shaft 52 through a bearing to be rotatable relative to each other at an angle. The clutch hollow shaft 52 is key-connected to the output shaft of the reduction motor 40. The clutch gear 51 can drive the U-shaped gear 532 to rotate meshingly with the rotation of the output shaft of the reduction motor 40, so as to rotate the rotating shaft 30. The limit contact plate 63 can adjust the spring force of the spring 65 through the locking nut 64 to adjust the position relative to the clutch hollow shaft 52. The limit contact plate 63 is divided into forward limit and reverse limit.

[0074] The overall action is divided into automatic and manual. When automatically lifting the hook, when the clutch hollow shaft 52 rotates forward by the reduction motor 40, the driving gear 53 is driven to rotate forward through the meshing of the clutch gear 51, so as to drive the rotating shaft 30 to rotate forward, and the coupler lock pin 71 is lifted until the forward limit contact plate 63 triggers the forward limit component 61, and the reduction motor 40 stops working, completing the hook-lifting action; the reduction motor 40 keeps the clutch hollow shaft 52 from rotating through the self-contained clutch.

[0075] The design focus of the present invention is: by designing the hinge point seat to be composed of a main body part and a cover plate part, designing the manual and automatic separation device to be composed of a clutch gear, a clutch hollow shaft and a driving gear, and then cooperating with the limit detection device composed of a limit component, a connecting shaft, a limit contact plate, a locking nut and a spring, the structure is simple, the stability and reliability are high, and the installation and maintenance are convenient, bringing convenience to the use.

[0076] The technical principle of the present invention has been described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be construed as limiting the protection scope of the present invention in any way. Based on the explanations herein, those skilled in the art can think of other specific embodiments of the present invention without creative labor, and these embodiments will fall within the protection scope of the present invention.

Claims

1. A new type of automatic hook - detaching device for metallurgical vehicles, characterized in that: It includes a bracket, a hinge point seat, a rotating shaft, a reduction motor, a manual-automatic separation device, and a limit detection device; The bracket has an accommodation space; The hinge point seat is arranged beside the bracket. The hinge point seat includes a main body part and a cover plate part. There is an embedded groove on the main body part, and a first half shaft groove is recessed on the bottom surface of the embedded groove. The cover plate part is embedded in the embedded groove and is detachably installed and connected to the main body part through connecting bolts. There is a second half shaft groove recessed on the cover plate part. The second half shaft groove and the first half shaft groove enclose and form a first shaft hole; The rotating shaft is adapted to the first shaft hole and is rotatably arranged in the first shaft hole. A coupler lock pin is arranged at one end of the rotating shaft, and a handle is provided at the other end of the rotating shaft; The reduction motor is fixed on the bracket; The manual-automatic separation device includes a clutch gear, a clutch hollow shaft, and a driving gear. The clutch gear is rotatably arranged in the accommodation space. There is an installation hole on the clutch gear. Two first clutch engagement teeth are radially symmetrically convex on the inner wall of the installation hole. Two arc-shaped chutes are formed between the two first clutch engagement teeth. The clutch hollow shaft is fixed on the output shaft of the reduction motor. The clutch hollow shaft is arranged in the installation hole. Two second clutch engagement teeth are radially symmetrically convex on the outer wall of the clutch hollow shaft. The two second clutch engagement teeth are respectively located in the corresponding arc-shaped chutes and move back and forth. The driving gear is rotatably arranged in the accommodation space. The driving gear meshes with the clutch gear and is fixedly connected to the rotating shaft; The limit detection device includes a limit component, a connecting shaft, a limit touch plate, a locking nut, and a spring. The limit component is arranged on the bracket, and two limit components are stacked inside and outside. The connecting shaft is installed on the clutch hollow shaft. There are two limit touch plates. Both limit touch plates are sleeved on the connecting shaft and are axially movable back and forth along the connecting shaft and rotatably arranged around the connecting shaft. The two limit touch plates are respectively located beside the two limit components. The two limit touch plates touch or leave the corresponding limit components as the connecting shaft rotates synchronously. The locking nut is threadedly connected to the outer end of the connecting shaft and is axially adjustable in position. The spring is sleeved on the connecting shaft, and the two ends of the spring respectively abut between the locking nut and the outermost limit touch plate. The spring urges the two limit touch plates to move axially inward.

2. The novel automatic uncoupling device for metallurgical vehicles according to claim 1, wherein: The driving gear includes a gear seat and a U-shaped gear. The gear seat includes a first seat body and a second seat body. The first seat body and the second seat body are detachably installed and connected through a first bolt. The first seat body and the second seat body are joined and enclosed to form a second shaft hole. The U-shaped gear is detachably installed and fixed on one side surface of the gear seat through a second bolt. The U-shaped gear has a U-shaped groove. The U-shaped groove is directly connected to the second shaft hole. The rotating shaft is located in the U-shaped groove and the second shaft hole and is fixedly connected to the gear seat.

3. The novel automatic hook disengaging device for metallurgical vehicles according to claim 2, characterized in that: A first through hole is opened on the first seat body. Correspondingly, a first screw hole is opened on the second seat body. The first bolt passes through the first through hole and is threadedly connected and fixed to the first screw hole.

4. The novel automatic uncoupling device for metallurgical vehicles according to claim 2, characterized in that: Second through holes are formed through both side surfaces of the U-shaped gear. Correspondingly, a second screw hole is opened on the first seat body. The second bolt passes through the second through hole and is threadedly connected and fixed to the second screw hole.

5. A novel automatic uncoupling device for metallurgical vehicles according to claim 1, characterized in that: A third shaft hole is opened on the clutch hollow shaft, and a key groove is opened on the inner wall of the third shaft hole.

6. The novel automatic uncoupling device for metallurgical vehicles according to claim 1, wherein: The main body member includes a fixed portion and a mounting portion integrally formed and connected. The groove is located on the mounting portion. The cover plate member is superimposed on the mounting portion and is installed and connected to the mounting portion by connecting bolts.

7. The novel automatic hook disengaging device for metallurgical vehicles as claimed in claim 6, wherein: Two screw holes are formed on the mounting portion, and the two screw holes are respectively located on both sides of the first half-axis groove. Two through holes are formed on the cover plate member, and the two through holes are respectively located on both sides of the second half-axis groove. Two connecting bolts respectively pass through the corresponding through holes and are screwed and fixed to the corresponding screw holes.

8. The novel automatic uncoupling device for metallurgical vehicles according to claim 6, characterized in that: A plurality of fixing holes for fixing bolts to pass through are formed on the fixed portion.

9. The novel automatic uncoupling device for metallurgical vehicles according to claim 1, wherein: The bracket includes a mounting base and a mounting plate. The accommodating space is located on the mounting base. The reduction motor is fixed on the mounting base. The mounting plate is mounted on the mounting base. The aforementioned limiting assembly is arranged on the mounting plate.

10. The novel automatic hook uncoupling device for metallurgical vehicles according to claim 1, characterized in that: A sleeve is sleeved on the connecting shaft. The sleeve is axially reciprocally movable along the connecting shaft. The sleeve is located between the two limiting touch plates. The connecting shaft includes a main body section and a screw section. The inner end of the main body section is connected to the outer end of the clutch hollow shaft. The aforementioned two limiting touch plates are sleeved on the main body section. The screw section extends integrally outward from the outer end of the main body section. The aforementioned locking nut is screwed to the screw section.

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