Axial positioning device of spline shaft and positioning method of axial positioning device

Abstract

The axial positioning device comprises a spline shaft main body, a first positioning sleeve, a power input shaft key sleeve, a spline head, a second positioning sleeve and a connecting shaft, the spline shaft main body is provided with the first positioning sleeve in a welding mode, and the end of the first positioning sleeve is welded and fixed through a welding ring; a telescopic and adjustable spline head is arranged at one end of the spline shaft body, the detachable second positioning sleeve is arranged on the spline head, a connecting shaft is arranged at the end of a mounting sleeve at the other end of the spline shaft body, and a power input shaft key sleeve is arranged at the end of the connecting shaft. The internal thread guide cavity is formed in one end of the inner cavity of the spline shaft body and can be in threaded transmission with the screw head at the end of the spline head, so that the spline head can be controlled to stretch out and draw back in the internal thread guide cavity through the guide rod, the position of the spline head can be adjusted, and output end structures at different positions can be conveniently installed on the spline head; and the flexibility is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the axial positioning device of spline shaft technical field, specifically to a kind of axial positioning device of spline shaft and its positioning method. BACKGROUND

[0002] Spline shaft is a kind of mechanical transmission, and flat key, half round key, inclined key have the same effect, all are to transmit mechanical torque, there are longitudinal keyways on the outer surface of shaft, and the rotating parts on the shaft also have corresponding keyways, which can keep synchronous rotation with the shaft. While rotating, some can also slide longitudinally on the shaft, such as gear shift gears in gearbox.

[0003] For example, the authorized patent with publication number CN117189793A (spline shaft and spline shaft coupling device): it includes first spline shaft, second spline shaft and center connecting shaft, the first spline shaft and the second spline shaft are provided with connecting grooves at one end, the center connecting shaft is provided with connecting blocks at both ends, and the connecting blocks are inserted and matched with the connecting grooves, and the connecting blocks and the connecting grooves are further connected and fixed by first bolts, and the first spline shaft, the second spline shaft and the center connecting shaft are further provided with positioning sleeves outside, and the first spline shaft and the second spline shaft are provided with spline grooves at one end, the first spline shaft and the second spline shaft are connected and fixed by the center connecting shaft at one end, and the first spline shaft, the second spline shaft and the center connecting shaft are limited and fixed by the positioning sleeves outside, so that the first spline shaft and the second spline shaft are connected and fixed, and the stability of the connection is high, and the disassembly and assembly are convenient and fast. The spline shaft of the above-mentioned prior art cannot be installed with a telescopic positioning sleeve at the end, so that the installation and fixation with the output end are not flexible enough, and it cannot cope with output end mechanisms with different lengths, and after the positioning sleeve is connected by clamping, it cannot be double-locked by screw rod, so that the stability of axial fixation is not enough, the positioning sleeve is clamped by the keyway at the same position, the stress surface is too concentrated, the keyway is easily damaged by stress, it cannot be staggered to offset the axial force, and the service life is short. SUMMARY

[0004] The present application aims to provide an axial positioning device of spline shaft and its positioning method to solve the problems of the spline shaft in the background art, which cannot be installed with a telescopic positioning sleeve at the end, so that the installation and fixation with the output end are not flexible enough, and it cannot cope with output end mechanisms with different lengths, and after the positioning sleeve is connected by clamping, it cannot be double-locked by screw rod, so that the stability of axial fixation is not enough, the positioning sleeve is clamped by the keyway at the same position, the stress surface is too concentrated, the keyway is easily damaged by stress, it cannot be staggered to offset the axial force, and the service life is short.

[0005] In order to achieve the above object, the present application provides the following technical scheme: an axial positioning device and positioning method of a spline shaft, comprising a spline shaft body, a first positioning sleeve, a power input shaft key sleeve, a spline head, a second positioning sleeve and a connecting shaft, the first positioning sleeve is arranged on the spline shaft body by welding, and the end thereof is fixed by welding ring, one end of the spline shaft body is provided with a spline head capable of being adjusted in extension and retraction, the spline head is provided with a detachable second positioning sleeve, the end of the mounting sleeve of the other end of the spline shaft body is provided with a connecting shaft, and the end of the connecting shaft is provided with a power input shaft key sleeve.

[0006] Preferably, the spline head comprises a spline groove, a second limiting lock groove and a screw head. A plurality of spline grooves are uniformly arranged on the outer side of the spline head, the central part of the spline groove is provided with a first limiting lock groove, two second limiting lock grooves are symmetrically arranged on the upper and lower end faces of the guide rod, and the screw head is arranged on the end of the guide rod.

[0007] Preferably, the first positioning sleeve comprises a third key, a guide groove and an adjusting rod. A plurality of guide grooves are uniformly arranged on the outer side of the first positioning sleeve, and a plurality of third keys are correspondingly arranged on the plurality of guide grooves, the adjusting rod is arranged in the middle part of the guide groove, and the adjusting rod is in transmission connection with the screw hole screw rod in the middle part of the bottom end of the third key, the end of the adjusting rod is provided with an adjusting handle, and the adjusting rod is provided with a scale line.

[0008] Preferably, the second positioning sleeve comprises a second key, a second positioning lock rod and a convex groove. A plurality of second keys are uniformly arranged on the outer side wall of the second positioning sleeve, the middle part of the second key is provided with a hidden lock hole, a plurality of convex grooves are uniformly arranged on the inner side wall of the second positioning sleeve, and the convex groove is arranged opposite to the second key, the second positioning lock rod is arranged in the inside of the hidden lock hole and is installed through the convex groove.

[0009] Preferably, the second positioning sleeve is fixedly sleeved with the outer side of the spline head, and is slidably embeddedly connected with the spline groove through the convex groove, and the second positioning lock rod is fixedly locked through the threaded fixing mode with the first limiting lock groove.

[0010] Preferably, a plurality of reinforcing plates are arranged on the side of the mounting sleeve, and the plurality of reinforcing plates are fixedly welded with the end of the spline shaft body.

[0011] Preferably, the connecting head is further arranged, the end of the connecting head is connected with the power input shaft, a plurality of first keys are arranged on the outer side of the power input shaft key sleeve, a butt joint is arranged at the end of the power input shaft key sleeve, the inner side of the connecting head is clamped and fixedly locked with the power input shaft key sleeve through the clamping groove, and the power input shaft key sleeve is butted with the connecting head inner cavity end through the butt joint of the end thereof.

[0012] Preferably, the spline shaft body inner cavity is provided with an internal thread guide cavity near the spline head, and a screw head is in threaded transmission connection with the internal thread guide cavity, the spline shaft body is provided with a positioning lock hole in the middle of the upper and lower surfaces near the end position, the positioning lock hole is internally provided with a first positioning lock rod, and the first positioning lock rod is in threaded fixation with a second limiting lock groove.

[0013] An axial positioning method of a spline shaft, comprising the following steps: 1) connecting the end of the connecting shaft with the mounting sleeve, connecting the power input shaft with the power input shaft key sleeve through the connecting head, and locking and fixing through the clamping groove and the first key, while making the butt joint with the inner cavity of the connecting head, so as to complete the axial positioning of the spline shaft and the power input end; 2) manually adjusting the adjusting rod to make the adjusting rod in transmission with the third key inside guide hole screw rod, and accurately adjusting and controlling the position of the third key through the scale line on the adjusting rod, adjusting the position of the third key on the first positioning sleeve, so as to keep the plurality of third keys in mutual staggered arrangement, and improve the stability of the first positioning sleeve and the transmission part connection; 3) manually rotating the guide rod at the end of the spline head to make the screw head at the end of the guide rod in threaded transmission with the internal thread guide cavity, adjusting the in-and-out of the guide rod in the internal thread guide cavity to adjust the position of the spline head, then sleeving the second positioning sleeve outside the adjusted spline head to make the convex groove inside the second positioning sleeve in sliding inlay connection with the plurality of spline grooves on the adjusted spline head, and after adjusting to the required position, locking and fixing the second positioning lock rod with the first limiting lock groove through the screwdriver, and making the second key outside the second positioning sleeve in axial positioning with the output end.

[0014] Compared with the prior art, the beneficial effects of the present application are: The spline shaft body inner cavity of the present application is provided with an internal thread guide cavity at one end, and the internal thread guide cavity can be in threaded transmission with the screw head at the end of the spline head, so that the spline head can be controlled to stretch and retract in the internal thread guide cavity through the guide rod, the position of the spline head can be adjusted, the spline head can be conveniently installed with output end structures at different positions, and the flexibility is greatly improved.

[0015] The second key of the second positioning sleeve of the present application is provided with a hidden lock hole inside the middle part, the middle part of the spline groove is provided with a first limiting lock groove, and the second positioning lock rod can be locked and fixed with the first limiting lock groove, so that the fastness of the second positioning sleeve and the spline head can be improved.

[0016] The first positioning sleeve of the application is provided with a guide groove, an adjusting rod is arranged in the guide groove, the adjusting rod can be driven and controlled by the third key inside guide hole screw rod, the position of the third key can be adjusted, the adjusting position can be accurately controlled through the scale line, the first positioning sleeve can be staggered with the key groove of the transmission part when the first positioning sleeve is embedded with the third key and the transmission part, the stress dispersion is ensured, the risk of stress deformation of the key groove is reduced, and the firmness and service life of the axial positioning are improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structural schematic view of the magnetic field auxiliary mechanical ball milling device of the application. Figure 2 It is a structural schematic view of the spline head of the application. Figure 3 It is a structural schematic view of the power input shaft key sleeve of the application. Figure 4 It is a structural schematic view of the second positioning sleeve of the application. Figure 5 It is a structural schematic view of the first positioning sleeve of the application. Figure 6 It is a front view of the application. Figure 7 It is a structural schematic view of the inside of the spline shaft body of the application. Figure 8 It is a top view of the first positioning sleeve of the application. Figure 9 It is a structural schematic view of part A of the application. Figure 10 It is a structural schematic view of part B of the application.

[0018] In the figure: 1, first positioning lock rod; 2, spline shaft body; 3, first positioning sleeve; 4, welding ring; 5, reinforcing plate; 6, power input shaft key sleeve; 7, mounting sleeve; 8, spline head; 9, second positioning sleeve; 10, connecting shaft; 11, first key; 12, butt joint; 13, second key; 14, hidden lock hole; 15, second positioning lock rod; 16, third key; 17, guide groove; 18, adjusting rod; 19, first limit lock groove; 20, spline groove; 21, second limit lock groove; 22, guide rod; 23, screw head; 24, power input shaft; 25, connecting head; 26, clamping groove; 27, positioning lock hole; 28, adjusting handle; 29, scale line; 30, internal thread guide cavity; 31, convex groove. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all the embodiments.

[0020] Please refer to Figures 1-10 An axial positioning device and positioning method of spline shaft, comprising spline shaft body 2, first positioning sleeve 3, power input shaft key sleeve 6, spline head 8, second positioning sleeve 9 and connecting shaft 10, first positioning sleeve 3 is arranged on spline shaft body 2 by welding, and its end is welded and fixed by welding ring 4, spline head 8 is arranged on one end of spline shaft body 2 and can be adjusted, second positioning sleeve 9 is detachably arranged on spline head 8, connecting shaft 10 is arranged at the end of mounting sleeve 7 of the other end of spline shaft body 2, and power input shaft key sleeve 6 is arranged at the end of connecting shaft 10.

[0021] First positioning sleeve 3 is used for positioning transmission mechanism, spline head 8 is used for conveniently mounting second positioning sleeve 9, second positioning sleeve 9 is used for axially positioning output end mechanism, power input shaft key sleeve 6 is used for connecting with power input end, conveniently inputting power, and spline shaft body 2 can be axially positioned.

[0022] Further, spline head 8 comprises spline groove 20, second limiting lock groove 21 and screw head 23; A plurality of spline grooves 20 are uniformly arranged on the outer side of spline head 8, first limiting lock groove 19 is arranged at the center of spline groove 20, two second limiting lock grooves 21 are symmetrically arranged on the upper and lower end faces of guide rod 22, and screw head 23 is arranged at the end of guide rod 22.

[0023] A plurality of spline grooves 20 are used for conveniently slidingly embedding and assembling with a plurality of convex grooves 31 on the inner side of second positioning sleeve 9, first limiting lock groove 19 is used for threadedly locking and fixing with second positioning lock rod 15, and second limiting lock groove 21 is used for locking and fixing with first positioning lock rod 1, so that the extension and retraction of guide rod 22 can be rotationally locked and fixed.

[0024] Further, first positioning sleeve 3 comprises third key 16, guide groove 17 and adjusting rod 18; A plurality of guide grooves 17 are uniformly arranged on the outer side of first positioning sleeve 3, and a plurality of third keys 16 are correspondingly arranged on the plurality of guide grooves 17, adjusting rod 18 is arranged at the middle part of guide groove 17, adjusting rod 18 is in transmission connection with the screw hole screw rod at the middle part of the bottom end of third key 16, adjusting handle 28 is arranged at the end of adjusting rod 18, and scale line 29 is arranged on adjusting rod 18.

[0025] Guide groove 17 is used for slidingly moving and guiding the installation of third key 16, adjusting rod 18 can manually adjust the movement of third key 16 in guide groove 17, and scale line 29 is used for positioning the adjusted position of third key 16.

[0026] Further, second positioning sleeve 9 comprises second key 13, second positioning lock rod 15 and convex groove 31; A plurality of second keys 13 are evenly arranged on the outer side wall of the second positioning sleeve 9, the middle part of the second key 13 is provided with a hidden lock hole 14, a plurality of convex grooves 31 are evenly arranged on the inner side wall of the second positioning sleeve 9, and the convex groove 31 is arranged opposite to the second key 13, the second positioning lock rod 15 is arranged inside the hidden lock hole 14 and passes through the convex groove 31 and is installed.

[0027] The second key 13 facilitates axial positioning and assembly with the output end mechanism, and the hidden lock hole 14 is used to hide the installation of the second positioning lock rod 15.

[0028] Further, the second positioning sleeve 9 is fixedly sleeved with the outer side of the spline head 8, and is slidably embedded and connected with the spline groove 20 through the convex groove 31, and the second positioning lock rod 15 is fixedly locked with the first limiting lock groove 19 through a threaded fixing mode.

[0029] This design can enhance the stability of the connection between the second positioning sleeve 9 and the spline head 8.

[0030] Further, the side of the mounting sleeve 7 is provided with a plurality of reinforcing plates 5, and the reinforcing plates 5 are welded and fixed with the end of the spline shaft body 2. The reinforcing plate 5 can enhance the firmness of the mounting sleeve 7.

[0031] Further, it also includes a connecting head 25, the end of the connecting head 25 is connected with the power input shaft 24, the outer side of the power input shaft key sleeve 6 is provided with a plurality of first keys 11, the end of the power input shaft key sleeve 6 is provided with a butt joint 12, the inner side of the connecting head 25 is clamped and locked with the power input shaft key sleeve 6 through the clamping groove 26, and the power input shaft key sleeve 6 is butted with the inner cavity end butt joint groove of the connecting head 25 through the butt joint 12 at the end thereof.

[0032] The connecting head 25 facilitates the axial positioning and connection of the power input shaft 24 and the power input shaft key sleeve 6, and the butt joint 12 can enhance the stability of the connection between the connecting head 25 and the power input shaft key sleeve 6.

[0033] Further, the inner thread guide cavity 30 is arranged on one side of the inner cavity of the spline shaft body 2 close to the spline head 8, and the screw head 23 is in threaded transmission connection with the inner thread guide cavity 30, and the positioning lock hole 27 is arranged at the middle of the upper and lower surfaces of the spline shaft body 2 close to the end position, and the first positioning lock rod 1 is arranged inside the positioning lock hole 27, and the first positioning lock rod 1 is in threaded fixation with the second limiting lock groove 21.

[0034] The threaded transmission of the screw head 23 and the inner thread guide cavity 30 facilitates manual adjustment of the position of the spline head 8.

[0035] An axial positioning method of a spline shaft, comprising the following steps: 1) the end of the connecting shaft 10 is connected with the mounting sleeve 7, the power input shaft 24 is connected with the power input shaft key sleeve 6 through the connecting head 25, and is locked and fixed with the first key 11 through the clamping groove 26, and the butt joint 12 is butted with the inner cavity of the connecting head 25, so that the spline shaft and the power input end are axially positioned; 2) the adjusting rod 18 is manually adjusted, the adjusting rod 18 is driven by the third key 16 inside the guide hole screw rod, the position of the third key 16 is accurately adjusted through the scale line 29 on the adjusting rod 18, the position of the third key 16 on the first positioning sleeve 3 is adjusted, the third keys 16 are kept staggered, and the stability of the connection between the first positioning sleeve 3 and the transmission member is improved; 3) the guide rod 22 at the end of the spline head 8 is manually rotated and controlled, the screw head 23 at the end of the guide rod 22 is in threaded transmission with the internal thread guide cavity 30, the guide rod 22 is adjusted to go in and out of the internal thread guide cavity 30, the position of the spline head 8 is adjusted, then the second positioning sleeve 9 is sleeved outside the adjusted spline head 8, the convex groove 31 inside the second positioning sleeve 9 is slidably embedded and connected with the plurality of spline grooves 20 on the adjusted spline head 8, after adjustment to the required position, the second positioning lock rod 15 is locked and fixed with the first limiting lock groove 19 by screwing with a screwdriver, and the second key 13 outside the second positioning sleeve 9 is axially positioned with the output end.

[0036] Working principle: when the device is used, the end of the connecting shaft 10 is connected with the mounting sleeve 7, the power input shaft 24 is connected with the power input shaft key sleeve 6 through the connecting head 25, and is locked and fixed with the first key 11 through the clamping groove 26, and the butt joint 12 is butted with the inner cavity of the connecting head 25, so that the spline shaft and the power input end are axially positioned; the adjusting rod 18 is manually adjusted, the adjusting rod 18 is driven by the third key 16 inside the guide hole screw rod, the position of the third key 16 is accurately adjusted through the scale line 29 on the adjusting rod 18, the position of the third key 16 on the first positioning sleeve 3 is adjusted, the third keys 16 are kept staggered, and the stability of the connection between the first positioning sleeve 3 and the transmission member is improved; the guide rod 22 at the end of the spline head 8 is manually rotated and controlled, the screw head 23 at the end of the guide rod 22 is in threaded transmission with the internal thread guide cavity 30, the guide rod 22 is adjusted to go in and out of the internal thread guide cavity 30, the position of the spline head 8 is adjusted, then the second positioning sleeve 9 is sleeved outside the adjusted spline head 8, the convex groove 31 inside the second positioning sleeve 9 is slidably embedded and connected with the plurality of spline grooves 20 on the adjusted spline head 8, after adjustment to the required position, the second positioning lock rod 15 is locked and fixed with the first limiting lock groove 19 by screwing with a screwdriver, and the second key 13 outside the second positioning sleeve 9 is axially positioned with the output end.

[0037] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims with respect to the figures of the patent document.

Claims

1. A kind of axial positioning device of spline shaft and its positioning method, including spline shaft body (2), first positioning sleeve (3), power input shaft key sleeve (6), spline head (8), second positioning sleeve (9) and connecting shaft (10), it is characterized by: The spline shaft body (2) is provided with a first positioning sleeve (3) by welding, the end thereof is welded and fixed by a welding ring (4), one end of the spline shaft body (2) is provided with a spline head (8) capable of being telescopically adjusted, the spline head (8) is provided with a detachable second positioning sleeve (9), the end of the mounting sleeve (7) of the other end of the spline shaft body (2) is provided with a connecting shaft (10), and the end of the connecting shaft (10) is provided with a power input shaft key sleeve (6).

2. A method of axial positioning of a splined shaft according to claim 1, wherein: The spline head (8) comprises a spline groove (20), a second limiting lock groove (21) and a screw head (23); A plurality of the spline grooves (20) are uniformly arranged on the outer side of the spline head (8), the middle of the spline groove (20) is provided with a first limiting lock groove (19), and two second limiting lock grooves (21) are symmetrically arranged on the upper and lower end faces of the guide rod (22), and the screw head (23) is arranged at the end of the guide rod (22).

3. A method of axial positioning of a splined shaft as claimed in claim 1, wherein: The first positioning sleeve (3) comprises a third key (16), a guide groove (17) and an adjusting rod (18); A plurality of the guide grooves (17) are uniformly arranged on the outer side of the first positioning sleeve (3), and a plurality of third keys (16) are correspondingly arranged on the plurality of guide grooves (17), the adjusting rod (18) is arranged at the middle of the guide groove (17), and the adjusting rod (18) is in transmission connection with the threaded hole screw rod at the middle of the bottom end of the third key (16), the end of the adjusting rod (18) is provided with an adjusting handle (28), and the adjusting rod (18) is provided with a scale line (29).

4. A method of axial positioning of a splined shaft as claimed in claim 1, wherein: The second positioning sleeve (9) comprises a second key (13), a second positioning lock rod (15) and a convex groove (31); A plurality of the second keys (13) are uniformly arranged on the outer side wall of the second positioning sleeve (9), the middle of the second key (13) is provided with a hidden lock hole (14), a plurality of the convex grooves (31) are uniformly arranged on the inner side wall of the second positioning sleeve (9), and the convex groove (31) is arranged opposite to the second key (13), and the second positioning lock rod (15) is arranged in the inside of the hidden lock hole (14) and is installed through the convex groove (31).

5. A method of axial positioning of a splined shaft according to claim 4, wherein: The second positioning sleeve (9) is fixedly sleeved with the outer side of the spline head (8) and is slidably embeddedly connected with the spline groove (20) through the convex groove (31), and the second positioning lock rod (15) is fixedly locked with the first limiting lock groove (19) through a threaded fixing mode.

6. A method of axial positioning of a splined shaft as claimed in claim 1, wherein: The side of the mounting sleeve (7) is provided with a plurality of reinforcing plates (5), and the plurality of reinforcing plates (5) are welded and fixed with the end of the spline shaft body (2).

7. A method of axial positioning of a splined shaft as claimed in claim 1, wherein: Further comprising a connecting head (25), the end of the connecting head (25) is connected with a power input shaft (24), the outer side of the power input shaft key sleeve (6) is provided with a plurality of first keys (11), the end of the power input shaft key sleeve (6) is provided with a butt joint head (12), the inner side of the connecting head (25) is clamped and fixed with the power input shaft key sleeve (6) through a clamping groove (26), and the power input shaft key sleeve (6) is butted with the inner cavity end butt joint groove of the connecting head (25) through the butt joint head (12) at the end thereof.

8. A method of axial positioning of a splined shaft according to claim 7, wherein: The inner thread guide cavity (30) is arranged on one side of the inner cavity of the spline shaft body (2) close to the spline head (8), and the screw head (23) is in threaded transmission connection with the inner thread guide cavity (30); the positioning lock holes (27) are arranged on the upper and lower surfaces of the spline shaft body (2) at the middle positions close to the end portions, and the first positioning lock rods (1) are arranged in the positioning lock holes (27); and the first positioning lock rods (1) are in threaded fixing connection with the second limiting lock grooves (21).

9. A method for axial positioning of a spline shaft, implemented by means of an axial positioning device according to any one of claims 1-8, characterized in that The method comprises the following steps: 1) the end portion of the connecting shaft (10) is connected with the mounting sleeve (7), the power input shaft (24) is connected with the power input shaft key sleeve (6) through the connecting head (25), and is locked and fixed with the first key (11) through the clamping groove (26), and the butt joint (12) is butted with the inner cavity of the connecting head (25), so that the spline shaft and the power input end are axially positioned; 2) the adjusting rod (18) is manually adjusted, the adjusting rod (18) is in transmission with the third key (16) inside the guide hole screw rod, the position of the third key (16) is accurately adjusted through the scale line (29) on the adjusting rod (18), the position of the third key (16) on the first positioning sleeve (3) is adjusted, the third keys (16) are kept in mutual misalignment, and the stability of the first positioning sleeve (3) and the transmission member is improved; 3) the guide rod (22) at the end portion of the spline head (8) is manually rotated and controlled, the screw head (23) at the end portion of the guide rod (22) is in threaded transmission with the inner thread guide cavity (30), the guide rod (22) is adjusted to enter and exit the inner thread guide cavity (30), the position of the spline head (8) is adjusted, then the second positioning sleeve (9) is sleeved on the outside of the adjusted spline head (8), the convex groove (31) on the inside of the second positioning sleeve (9) is in sliding inlay connection with the plurality of spline grooves (20) on the adjusted spline head (8), after being adjusted to the required position, the second positioning lock rod (15) is locked and fixed with the first limiting lock groove (19) through the screwdriver, and the second key (13) on the outside of the second positioning sleeve (9) is axially positioned with the output end.

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