Spline shaft nut tightening device

Abstract

The utility model discloses a spline shaft nut tightening device relates to automobile assembly technical field, it includes installation frame, spline gear axle group push positioning unit, round nut multiteeth clamping positioning board, fixed torque tightening axle moving unit, axle group punch riveting positioning fixed unit and tightening axle control system, spline gear axle group push positioning unit installs in installation frame lower part, and round nut multiteeth clamping positioning board sets up on installation frame, and fixed torque tightening axle moving unit, tightening axle control system and axle group punch riveting positioning fixed unit all set up on installation frame top, and tightening axle control system controls fixed torque tightening axle moving unit and spline gear axle group push positioning unit cooperation realizes the tightening of spline shaft nut, and axle group punch riveting positioning fixed unit realizes the positioning punch riveting of spline shaft nut after tightening. The utility model can solve the problem of big manual labor intensity, time -consuming and labor -intensive, low efficiency, quality has no guarantee of current spline shaft nut tightening installation method.

Description

Technical Field

[0001] This utility model relates to the field of automotive axle gearbox component assembly technology, and in particular to a device for tightening and riveting spline shaft nuts. Background Technology

[0002] The rapid development of new energy vehicles makes the assembly process of electric drive axle reduction gearboxes crucial, especially the assembly of the splined gear shaft assembly. Currently, the tightening of the input splined gear shaft assembly nut in the reduction gearbox uses simple tooling and is done manually. The manual tightening of the round nut to position and press the bearing is performed on the bearing. Using a manual wrench to tighten the round nut and press the bearing results in inconsistent tightening torque, which cannot be guaranteed by the individual operator. Furthermore, the two-tooth wrench requires adjustment of the nut slot at different angles, which can easily damage the nut slot. Additionally, manual tightening of the splined gear shaft assembly nut makes it impossible to collect real-time torque data, resulting in untraceable information. All these factors negatively impact product quality. Therefore, the existing installation method is labor-intensive, time-consuming, inefficient, and lacks quality assurance. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a splined shaft nut tightening device, which can solve the problems of high manual labor intensity, time-consuming and labor-intensive, low efficiency and no quality guarantee in the existing splined shaft nut tightening and installation methods.

[0004] To solve the above problems, the technical solution of this utility model is: this spline shaft nut tightening device includes an installation frame, a spline gear shaft assembly push-up positioning unit, a round nut multi-tooth clamping positioning plate, a torque tightening shaft moving unit, a shaft assembly punching and riveting positioning and fixing unit, and a tightening shaft control system.

[0005] The splined gear shaft assembly push-up positioning unit is installed at the lower part of the mounting frame. The round nut multi-tooth clamping positioning plate is set on the mounting frame above the splined gear shaft assembly push-up positioning unit. The fixed torque tightening shaft moving unit, the tightening shaft control system, and the shaft assembly punching and riveting positioning and fixing unit are all set on the mounting frame. The tightening shaft control system controls the fixed torque tightening shaft moving unit to cooperate with the splined gear shaft assembly push-up positioning unit to tighten the splined shaft nut. The shaft assembly punching and riveting positioning and fixing unit performs positioning and riveting on the tightened splined shaft nut.

[0006] A more specific solution in the above technical solution is: the spline gear shaft assembly push-up positioning unit includes four connecting guide pillars, a cylinder mounting plate, a support ring, a cylinder head flange, a shaft assembly positioning outer ring, an anti-collision nylon positioning block, a center positioning cone pin, and a lifting cylinder; The cylinder mounting plate is fixed to the lower part of the frame. The cylinder body of the lifting cylinder is mounted on the bottom surface of the cylinder mounting plate. The cylinder mounting plate is provided with four connecting guide posts, the top ends of which are fixedly connected to the top of the frame. The support ring is located at the center of the cylinder mounting plate. The piston rod of the lifting cylinder is connected to the cylinder head flange. The top end of the piston rod of the lifting cylinder is equipped with the center positioning cone pin. The cylinder head flange is located above the support ring. The cylinder head flange is provided with the shaft group positioning outer ring. The anti-collision nylon positioning block is provided inside the shaft group positioning outer ring. The shaft group positioning outer ring is fitted with a tightening spline gear shaft group. In use, the bottom center hole of the tightening spline gear shaft group cooperates with the center positioning cone pin. The spline gear shaft group passes through the center slot of the round nut multi-tooth clamping positioning plate. The round nut multi-tooth clamping positioning plate fixes and positions the round nut.

[0007] Furthermore, the spline gear shaft assembly push-up positioning unit also includes a change-up positioning outer ring, a change-up anti-collision nylon positioning block, a change-up center positioning cone pin, and a change-up positioning pin mounting plate. The lower part of the change-up positioning outer ring is disposed within the anti-collision nylon positioning block, and the change-up positioning pin mounting plate is installed in the upper part of the change-up positioning outer ring. The change-up anti-collision nylon positioning block is installed on the change-up positioning pin mounting plate, and the change-up center positioning cone pin is installed in the middle of the change-up positioning pin mounting plate. When a change-up is required, the spline gear shaft assembly is fitted into the change-up positioning outer ring. The bottom center hole of the spline gear shaft assembly mates with the change-up center positioning cone pin. The spline gear shaft assembly passes through the center slot of the multi-tooth clamping positioning plate of the round nut, and the multi-tooth clamping positioning plate of the round nut is used to fix and position the round nut.

[0008] Furthermore, the constant torque tightening shaft moving unit includes a guide rail mounting seat, a limit block, an adjusting screw, a hydraulic buffer, a linear guide rail slider pair, a shaft mounting seat, a tightening shaft, a spline sleeve, a cylinder mounting plate, a lifting cylinder, a cylinder head, and a cylinder pull seat.

[0009] The guide rail mounting base is mounted on the platform, the linear guide rail slider pair is vertically mounted on the guide rail mounting base, the limiting block is mounted on the bottom of the linear guide rail slider pair, and the adjusting screw and the hydraulic buffer are set on the limiting block; the shaft mounting base is mounted on the guide rail of the linear guide rail slider pair, the tightening shaft is mounted on the shaft mounting base, the spline sleeve is mounted on the bottom end of the tightening shaft, and the center of the spline sleeve is directly opposite the center of the tightening spline gear shaft assembly; the lifting cylinder is mounted on the top end of the linear guide rail slider pair through the cylinder mounting plate, and the cylinder head of the lifting cylinder is connected to the cylinder pull seat at the upper end of the shaft mounting base to control the shaft mounting base and the tightening shaft to move up and down.

[0010] Furthermore: the mounting frame includes a square tube support frame and a platform; the square tube support frame is constructed by welding 4 vertical long square tubes and 4 horizontal short square tubes, and the four corners of the platform are connected to the top of the square tube support frame; the platform has fixing holes for fixing the shaft group punching and riveting positioning fixing unit and the spline gear shaft group push-up positioning unit.

[0011] Furthermore: the shaft assembly punching and riveting positioning and fixing unit is installed on the platform on the side opposite to the multi-tooth clamping positioning plate of the round nut; the shaft assembly punching and riveting positioning and fixing unit includes a punching and riveting fixing seat, a nylon positioning ring and a punching and riveting spline gear shaft assembly; the punching and riveting fixing seat is installed on the platform by bolts, the nylon positioning ring is disposed in the punching and riveting fixing seat, and the punching and riveting spline gear shaft assembly is fitted into the nylon positioning ring.

[0012] Furthermore: the round nut multi-tooth clamping positioning plate has a boss that mates with the platform, and the central inner hole of the round nut multi-tooth clamping positioning plate is provided with a shaft groove that mates with the tightening spline gear shaft assembly.

[0013] Furthermore: the tightening shaft control system includes a mounting bracket, a tightening shaft main power supply box, a tightening shaft control box, and a PLC touch screen control box; the tightening shaft main power supply box and the tightening shaft control box are mounted side by side on the mounting bracket, and the PLC touch screen control box is installed below the tightening shaft control box; the tightening shaft main power supply box, the tightening shaft control box, and the PLC touch screen control box are electrically connected; the tightening shaft control system controls the movement of the fixed torque tightening shaft moving unit to cooperate with the spline gear shaft assembly push positioning unit to complete the tightening of the spline shaft nut.

[0014] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art: 1) This utility model has a reliable mechanical structure, uses pneumatic components for clamping, and the tightening force of the tightening shaft is precise and controllable, resulting in high production efficiency, high safety, and simple and convenient operation.

[0015] 2) This utility model can be installed in the gearbox assembly line for automated use, improving automation capabilities, while strengthening the enterprise's technological upgrading, accelerating the enterprise's own development prospects, and enhancing its industry competitiveness.

[0016] 3) This utility model uses mechanical tightening to replace manual tightening, which is simple to operate and has high production efficiency. It reduces the skill level requirements for workers, reduces labor intensity, and reduces labor costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2This is a schematic diagram of the mounting frame structure of this utility model; Figure 3 This is a schematic diagram of the structure of the splined gear shaft assembly push-positioning unit of this utility model; Figure 4 This is a schematic diagram of the multi-tooth clamping and positioning plate for round nuts of this utility model; Figure 5 This is a schematic diagram of the installation location of the multi-tooth clamping and positioning plate for the round nut of this utility model; Figure 6 This is a schematic diagram of the moving unit structure of the constant torque tightening shaft of this utility model; Figure 7 This is a schematic diagram of the shaft system punching and riveting positioning and fixing unit structure of this utility model; Figure 8 This is a schematic diagram of the tightening shaft control system of this utility model.

[0018] The labels in the diagram are as follows: 10. Install the rack 11. Square tube support frame; 12. Tabletop; 20. Splined gear shaft assembly push-up positioning unit, 21. Four connecting guide pillars; 22. Lifting cylinder mounting plate; 23. Support ring; 24. Cylinder head flange; 25. Shaft assembly positioning outer ring; 26. Anti-collision nylon positioning block; 27. Center positioning tapered pin; 251. Change-out positioning outer ring; 252. Tightening spline gear shaft assembly; 261. Change-out anti-collision nylon positioning block; 271. Change-out center positioning tapered pin; 271. Spline gear shaft; 28. Change-out positioning pin mounting plate; 29. ​​Lifting cylinder; 30 round nut multi-tooth clamping positioning plate 40 Torque Tightening Shaft Moving Unit 41. Guide rail mounting base; 42. Limit block; 43. Adjusting screw; 44. Hydraulic damper; 45. Linear guide rail slider pair; 46. Shaft mounting base; 47. Tightening shaft; 48. Splined sleeve. 49. Lifting cylinder mounting plate; 491. Lifting cylinder; 492. Cylinder head; 493. Cylinder pull block; 50. Shaft assembly punching and riveting positioning and fixing unit 51. Stamped and riveted mounting base; 52. Nylon positioning ring; 53. Stamped and riveted spline gear shaft assembly; 60. Tighten the shaft control system. 61. Mounting bracket; 62. Tightening shaft main power supply box; 63. Tightening shaft control box; 64. PLC touch screen control box. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figures 1 to 8The splined shaft nut tightening device includes a mounting frame 10, a splined gear shaft assembly push-positioning unit 20, a round nut multi-tooth clamping positioning plate 30, a constant torque tightening shaft moving unit 40, a shaft assembly punching and riveting positioning and fixing unit 50, and a tightening shaft control system 60.

[0020] like Figure 2 As shown, the mounting frame 10 includes a square tube support frame 11 and a platform 12. The square tube support frame 11 is constructed by welding four vertical long square tubes and four horizontal short square tubes. The four corners of the platform 12 are connected to the top of the square tube support frame 11. The platform 12 has fixing holes for fixing the shaft assembly punching and riveting positioning fixing unit 50 and the spline gear shaft assembly push-up positioning unit 20. A round nut multi-tooth clamping positioning plate 30 is installed at the center of the fixing hole of the spline gear shaft assembly push-up positioning unit 20. The spline gear shaft assembly push-up positioning unit 20 is installed on the mounting frame 10 on the lower left side of the platform 12.

[0021] like Figure 3 As shown, the splined gear shaft assembly push-up positioning unit 20 includes four connecting guide pillars 21, a lifting cylinder mounting plate 22, a support ring 23, a cylinder head flange 24, a shaft assembly positioning outer ring 25, an anti-collision nylon positioning block 26, a center positioning cone pin 27, a change-up positioning outer ring 251, a change-up anti-collision nylon positioning block 261, a change-up center positioning cone pin 271, a change-up positioning pin mounting plate 28, and a lifting cylinder 29.

[0022] The cylinder mounting plate 22 is fixed on the frame 10. The cylinder body of the lifting cylinder 29 is mounted on the bottom surface of the lifting cylinder mounting plate 22. Four connecting guide pillars 21 are provided at the four corners of the lifting cylinder mounting plate 22, and the tops of the four connecting guide pillars 21 are fixedly connected to the platform 12. The support ring 23 is located at the center of the lifting cylinder mounting plate 22. The piston rod of the lifting cylinder 29 is connected to the cylinder head flange 24. A center positioning cone pin 27 is installed at the top of the piston rod of the lifting cylinder 29. The center positioning cone pin 27 is used to position the bottom center hole of the spline gear shaft assembly 252. The cylinder head flange 24 is located above the support ring 23. A shaft assembly positioning outer ring 25 is provided on the cylinder head flange 24. A shaft assembly positioning outer ring 25 is provided inside the shaft assembly positioning outer ring 25. A replacement positioning outer ring 251 is provided. A collision-resistant nylon positioning block 26 is provided between the lower part of the replacement positioning outer ring 251 and the shaft assembly positioning outer ring 25. The function of the collision-resistant nylon positioning block 26 is to prevent the bearing mounting part of the spline gear shaft assembly 252 from being bumped. A replacement positioning pin mounting plate 28 is installed inside the upper part of the replacement positioning outer ring 251. A replacement collision-resistant nylon positioning block 261 is installed on the replacement positioning pin mounting plate 28. The replacement collision-resistant nylon positioning block 261 is used to prevent the bearing part of the spline gear shaft assembly 252 from being bumped. A replacement center positioning taper pin 271 is installed in the middle of the replacement positioning pin mounting plate 28. The replacement center positioning taper pin 271 is used to position the bottom center hole of the spline gear shaft assembly 252. In use, tighten the splined gear shaft assembly 252 onto the outer positioning ring 25 of the shaft assembly. Tighten the center hole at the bottom of the splined gear shaft assembly 252 to engage with the center positioning tapered pin 27. The tightened splined gear shaft assembly 252 on the center positioning tapered pin 27 passes through the center slot of the round nut multi-tooth clamping positioning plate 30, which fixes and positions the round nut. When a changeover is required, the splined gear shaft assembly 252 is fitted onto the changeover positioning outer ring 251. The center hole at the bottom of the splined gear shaft assembly 252 engages with the changeover center positioning tapered pin 271. The splined gear shaft assembly 252 on the changeover center positioning tapered pin 271 passes through the center slot of the round nut multi-tooth clamping positioning plate 30, which fixes and positions the round nut. Figure 5 As shown.

[0023] like Figure 4 and Figure 5 As shown, the round nut multi-tooth clamping positioning plate 30 has a boss that mates with the platform 12, and the central inner hole of the round nut multi-tooth clamping positioning plate 30 is provided with a shaft groove that mates with the tightening spline gear shaft assembly 252.

[0024] like Figure 6 As shown, the constant torque tightening shaft moving unit 40 includes a guide rail mounting base 41, a limit block 42, an adjusting screw 43, a hydraulic buffer 44, a linear guide rail slider pair 45, a shaft mounting base 46, a tightening shaft 47, a spline sleeve 48, a lifting cylinder mounting plate 49, a lifting cylinder 491, a cylinder head 492, and a cylinder pull seat 493.

[0025] The guide rail mounting base 41 is mounted on the platform 12, directly opposite the round nut multi-tooth clamping positioning plate 30. The linear guide rail slider pair 45 is vertically mounted on the guide rail mounting base 41. The limit block 42 is mounted on the bottom of the linear guide rail slider pair 45. The limit block 42 is equipped with an adjusting screw 43 and a hydraulic damper 44. The adjusting screw 43 is used to adjust the lower limit of the shaft mounting base 46, and the hydraulic damper 44 is used to reduce the impact force of the shaft mounting base 46 descending. The shaft mounting base 46 is mounted on the guide rail of the linear guide rail slider pair 45. The tightening shaft 47 is mounted on the shaft mounting base 46. A spline sleeve 48 is mounted on the bottom end of the tightening shaft 47. The center of the spline sleeve 48 is directly opposite the center of the spline gear shaft assembly 252. The spline sleeve 48 is used to fit into the spline of the positioning spline gear shaft assembly 252. The lifting cylinder 491 is mounted on the top of the linear guide slider pair 45 via the lifting cylinder mounting plate 49. The cylinder head 492 of the lifting cylinder 491 is connected to the cylinder pull seat 493 at the upper end of the shaft mounting seat 46, controlling the entire shaft mounting seat 46 together with the tightening shaft 47 to move up and down.

[0026] like Figure 1 and Figure 7 As shown, the shaft assembly riveting positioning and fixing unit 50 is installed on the platform 12 on the side opposite to the multi-tooth clamping positioning plate 30 of the round nut; the shaft assembly riveting positioning and fixing unit 50 includes a riveting fixing seat 51, a nylon positioning ring 52 and a riveting spline gear shaft assembly 53; the riveting fixing seat 51 is installed on the platform 12 by bolts, the nylon positioning ring 52 is set in the riveting fixing seat 51, and the riveting spline gear shaft assembly 53 is fitted into the nylon positioning ring 52. The shaft assembly riveting positioning and fixing unit 50 realizes the positioning and riveting of the tightened spline shaft nut.

[0027] like Figure 1 and Figure 8 As shown, the tightening shaft control system 60 is installed on the other side of the linear guide slider pair 45. The tightening shaft control system 60 includes a mounting bracket 61, a tightening shaft main power supply box 62, a tightening shaft control box 63, and a PLC touch screen control box 64. The tightening shaft main power supply box 62 and the tightening shaft control box 63 are installed side by side on the mounting bracket 61. The PLC touch screen control box 64 is installed below the tightening shaft control box 63. The tightening shaft main power supply box 62, the tightening shaft control box 63, and the PLC touch screen control box 64 are electrically connected. The tightening shaft control system 60 is used to control the movement of the constant torque tightening shaft moving unit 40 to cooperate with the spline gear shaft group push positioning unit 20 to complete the tightening of the spline shaft nut.

[0028] This utility model is applied to the assembly line of vehicle axle gearbox. The cylinder automatically lifts and positions itself, and the multi-tooth clamping positioning is reliable, saving time and effort. It also displays the constant torque in real time and the data is traceable.

[0029] The entire work implementation process is as follows: 1) Place the spline gear shaft assembly into the shaft assembly positioning outer ring below the platform, and make its bottom center hole engage with the center positioning tapered pin; automatically push the spline gear shaft assembly to move and rise through the lifting cylinder, so that the top spline shaft part passes through the center hole of the round nut multi-tooth clamping positioning plate and protrudes above the platform, so that the round nut of the spline gear shaft assembly engages with the round nut multi-tooth clamping positioning plate below the platform to achieve tooth and groove engagement, and the end face of the round nut is mechanically limited and tightened with the surface of the round nut multi-tooth clamping positioning plate.

[0030] 2) The fixed torque tightening shaft moving unit above the platform pushes the shaft mounting seat and tightening shaft to move and descend together through the piston rod of the top cylinder. The shaft head of the tightening shaft descends and rotates at the same time. The shaft head drives the spline sleeve connected to the tightening shaft. The spline sleeve engages with the spline shaft teeth exposed on the platform surface. The spline teeth are inserted into the spline sleeve, causing the spline shaft assembly to rotate and rise. The round nut remains stationary. The fixed torque tightening shaft tightens the spline shaft assembly and the round nut to the preset torque.

[0031] 3) After tightening is completed, the constant torque tightening shaft moving unit pulls the shaft mounting seat and the tightening shaft together with the top cylinder piston rod to disengage from the spline gear shaft assembly.

[0032] 4) The splined gear shaft assembly under the platform pushes the positioning unit upward, and the piston rod of the lifting cylinder pulls the positioning outer ring of the shaft assembly and the splined gear shaft assembly down together, disengaging from the multi-tooth clamping positioning plate of the round nut.

[0033] 5) Take out the tightened spline gear shaft assembly and place it in the shaft assembly punching and positioning fixation on the table. Manually use a chisel to punch and tighten the anti-loosening ring of the round nut.

[0034] 6) Manually remove the spline gear shaft assembly from the riveting and positioning position and place it in place. The operation is complete, and the next cycle of tightening and riveting operation begins.

[0035] 7) When a change of type is required, after installing the change of type positioning outer ring 251, anti-collision nylon positioning block 26, change of type positioning outer ring 251, change of type positioning pin mounting plate 28 and change of type center positioning cone pin 271, repeat the above steps.

[0036] In the description of this utility model, it should be noted that the terms "center", "middle", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A splined shaft nut tightening device, characterized in that: It includes a mounting frame (10), a spline gear shaft assembly push-up positioning unit (20), a round nut multi-tooth clamping positioning plate (30), a constant torque tightening shaft moving unit (40), a shaft assembly punching and riveting positioning and fixing unit (50), and a tightening shaft control system (60). The splined gear shaft assembly push-up positioning unit (20) is installed at the lower part of the mounting frame (10). The round nut multi-tooth clamping positioning plate (30) is set on the mounting frame (10) above the splined gear shaft assembly push-up positioning unit (20). The fixed torque tightening shaft moving unit (40), the tightening shaft control system (60), and the shaft assembly punching and riveting positioning and fixing unit (50) are all set on the mounting frame (10). The tightening shaft control system (60) controls the fixed torque tightening shaft moving unit (40) to cooperate with the splined gear shaft assembly push-up positioning unit (20) to tighten the splined shaft nut. The shaft assembly punching and riveting positioning and fixing unit (50) performs positioning and punching on the tightened splined shaft nut.

2. The splined shaft nut tightening device according to claim 1, characterized in that: The splined gear shaft assembly push-up positioning unit (20) includes four connecting guide pillars (21), a lifting cylinder mounting plate (22), a support ring (23), a cylinder head flange (24), a shaft assembly positioning outer ring (25), an anti-collision nylon positioning block (26), a center positioning cone pin (27), and a lifting cylinder (29). The lifting cylinder mounting plate (22) is fixed to the lower part of the frame (10). The cylinder body of the lifting cylinder (29) is installed on the bottom surface of the lifting cylinder mounting plate (22). The lifting cylinder mounting plate (22) is provided with the four connecting guide pillars (21). The top of the four connecting guide pillars (21) is fixedly connected to the top of the frame (10). The support ring (23) is located at the center of the lifting cylinder mounting plate (22). The piston rod of the lifting cylinder (29) is connected to the cylinder head flange (24). The top of the piston rod of the lifting cylinder (29) is equipped with the center positioning cone pin (27). The cylinder head flange (24) is located above the support ring (23). The cylinder head flange (24) is provided with the shaft group positioning outer ring (25). The anti-collision nylon positioning block (26) is provided inside the shaft group positioning outer ring (25). The shaft group positioning outer ring (25) is fitted with a spline gear shaft group (252). In use, the bottom center hole of the spline gear shaft group (252) cooperates with the center positioning tapered pin (27). The spline gear shaft group (252) passes through the center slot of the round nut multi-tooth clamping positioning plate (30). The round nut multi-tooth clamping positioning plate (30) fixes and positions the round nut.

3. The splined shaft nut tightening device according to claim 2, characterized in that: The splined gear shaft assembly push-up positioning unit (20) further includes a change-up positioning outer ring (251), a change-up anti-collision nylon positioning block (261), a change-up center positioning cone pin (271), and a change-up positioning pin mounting plate (28); the lower part of the change-up positioning outer ring (251) is disposed inside the anti-collision nylon positioning block (261), and the change-up positioning pin mounting plate (28) is installed inside the upper part of the change-up positioning outer ring (251), and the change-up anti-collision nylon positioning block (261) is installed on the change-up positioning pin mounting plate (28). 1) The center positioning cone pin (271) of the replacement positioning pin mounting plate (28) is installed in the middle; when the replacement is required, the spline gear shaft assembly (252) is fitted into the replacement positioning outer ring (251), the bottom center hole of the spline gear shaft assembly (252) cooperates with the center positioning cone pin (271), the spline gear shaft assembly (252) passes through the center slot of the round nut multi-tooth clamping positioning plate (30), and the round nut multi-tooth clamping positioning plate (30) fixes and positions the round nut.

4. The splined shaft nut tightening device according to claim 1 or 3, characterized in that: The constant torque tightening shaft moving unit (40) includes a guide rail mounting base (41), a limit block (42), an adjusting screw (43), a hydraulic buffer (44), a linear guide rail slider pair (45), a shaft mounting base (46), a tightening shaft (47), a spline sleeve (48), a lifting cylinder mounting plate (49), a lifting cylinder (491), a cylinder head (492), and a cylinder pull seat (493). The guide rail mounting base (41) is mounted on the platform (12), the linear guide rail slider pair (45) is mounted on the guide rail mounting base (41), the limiting block (42) is mounted on the bottom of the linear guide rail slider pair (45), the adjusting screw (43) and the hydraulic buffer (44) are set on the limiting block (42); the shaft mounting base (46) is mounted on the guide rail of the linear guide rail slider pair (45), the tightening shaft (47) is mounted on the shaft mounting base (46), the spline sleeve (48) is mounted on the bottom end of the tightening shaft (47), and the center of the spline sleeve (48) is directly opposite the center of the tightening spline gear shaft assembly (252); The lifting cylinder (491) is mounted on the top of the linear guide slider pair (45) via the lifting cylinder mounting plate (49). The cylinder head (492) is connected to the cylinder pull seat (493) at the upper end of the shaft mounting seat (46) to control the shaft mounting seat (46) and the tightening shaft (47) to move up and down.

5. The splined shaft nut tightening device according to claim 4, characterized in that: The mounting frame (10) includes a square tube support frame (11) and a platform (12); the square tube support frame (11) is composed of 4 vertical long square tubes and 4 horizontal short square tubes welded together, and the four corners of the platform (12) are connected to the top of the square tube support frame (11); the platform (12) has fixing holes for fixing the shaft group punching and riveting positioning fixing unit (50) and the spline gear shaft group push positioning unit (20).

6. The splined shaft nut tightening device according to claim 5, characterized in that: The shaft assembly punching and riveting positioning and fixing unit (50) is installed on the platform (12) on the side opposite to the round nut multi-tooth clamping positioning plate (30); the shaft assembly punching and riveting positioning and fixing unit (50) includes a punching and riveting fixing seat (51), a nylon positioning ring (52) and a punching and riveting spline gear shaft assembly (53); the punching and riveting fixing seat (51) is installed on the platform (12), the nylon positioning ring (52) is disposed in the punching and riveting fixing seat (51), and the punching and riveting spline gear shaft assembly (53) is fitted into the nylon positioning ring (52).

7. The splined shaft nut tightening device according to claim 6, characterized in that: The round nut multi-tooth clamping positioning plate (30) has a boss that is installed in conjunction with the platform (12), and the central inner hole of the round nut multi-tooth clamping positioning plate (30) is provided with a shaft groove that is in conjunction with the spline gear shaft assembly (252).

8. The splined shaft nut tightening device according to claim 7, characterized in that: The tightening shaft control system (60) includes a mounting bracket (61), a tightening shaft main power supply box (62), a tightening shaft control box (63), and a PLC touch screen control box (64). The tightening shaft main power supply box (62) and the tightening shaft control box (63) are mounted on the mounting bracket (61), and the PLC touch screen control box (64) is mounted below the tightening shaft control box (63). The tightening shaft main power supply box (62), the tightening shaft control box (63), and the PLC touch screen control box (64) are electrically connected. The tightening shaft control system (60) controls the movement of the fixed torque tightening shaft moving unit (40) to cooperate with the spline gear shaft group push positioning unit (20) to complete the tightening of the spline shaft nut.

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