Positioning mechanism for machining automobile universal joint

Abstract

The invention belongs to the technical field of clamping machining devices, and particularly discloses a positioning mechanism for machining an automobile universal joint, which comprises a cross shaft self-centering clamping jaw mechanism, a rotary adjusting assembly, a self-feeding grinding mechanism and a cross shaft body, the cross shaft self-centering clamping jaw mechanism is arranged on the rotary adjusting assembly, and the self-feeding grinding mechanism is arranged on the cross shaft body. And the self-feeding grinding mechanism is arranged on the rotary adjusting assembly. The split type sliding blocks connected through the pressure applying springs are provided, on one hand, the pressure applying sliding blocks are allowed to continuously slide after the position of the cross shaft body is adjusted through contraction of the pressure applying springs, and the situation that the adjusting rotary disc is clamped before the cross shaft body is locked is avoided; on the other hand, the position stability of the cross shaft body can be improved through the elastic force of the pressure applying spring.

Description

Technical Field

[0001] The present invention belongs to the technical field of clamping processing devices, and specifically refers to a positioning mechanism for processing automotive universal joints. Background Art

[0002] The cross shaft is an important component of the universal joint. Generally, it is integrally processed by casting or forging, and finally, the end part of the cross shaft that needs to be precisely fitted with parts such as bearings and bushings is finely processed. At present, the processing method mostly uses a general machine tool for clamping and processing. Since the steps such as clamping, adjustment, and tool setting are cumbersome, the efficiency is low during mass production. Although some fixtures obtained by mold opening have high clamping efficiency, they cannot handle parts of different specifications. This solution aims to provide a device for quickly clamping and processing cross shafts of different specifications. Summary of the Invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a positioning mechanism for processing automotive universal joints. In order to simultaneously adjust the position and angle of the cross shaft body, the present invention borrows the basic principle of a three-jaw chuck: the workpiece is pushed by the top jaws that approach synchronously. However, different from this, the three-jaw chuck positions and clamps shaft-like parts through the continuously tightened top jaws. However, the cross shaft is not a shaft-like part, and the clamping part and clamping direction are different. In the face of this difference, the present invention first proposes a split slider connected by a pressure spring. On the one hand, the contraction of the pressure spring allows the pressure slider to continue to slide after the position of the cross shaft body is adjusted, avoiding the adjustment turntable from jamming before the cross shaft body is locked. On the other hand, the elasticity of the pressure spring can also improve the position stability of the cross shaft body.

[0004] In addition, the rotation and feed of the tool are generally controlled by two independent drive modules. In order to simplify the structure, the present invention also proposes a self-feed grinding mechanism, which adjusts the basic position of the feed spring through a sliding feed seat that can reciprocate within a certain range, so as to automatically realize the feed and retraction of the tool while the tool is rotating through the thrust and pull provided by the feed spring.

[0005] The technical solution adopted by the present invention is as follows: The present invention proposes a positioning mechanism for processing automotive universal joints, including a cross shaft self-centering chuck mechanism, a rotation adjustment assembly, a self-feed grinding mechanism, and a cross shaft body. The cross shaft self-centering chuck mechanism is arranged on the rotation adjustment assembly, and the self-feed grinding mechanism is arranged on the rotation adjustment assembly; Further, the cross-axis self-centering jaw mechanism includes a sliding pressure application assembly, a self-centering limit assembly, and a squeezing and fixing assembly. The sliding pressure application assembly is arranged on the rotation adjustment assembly. The self-centering limit assembly is annularly and evenly arranged on the sliding pressure application assembly. The squeezing and fixing assembly is arranged on the sliding pressure application assembly.

[0006] When the cross-axis self-centering jaw mechanism is continuously and unidirectionally rotationally driven, it can sequentially adjust the position of the cross-axis body and lock and fix it. Different from the traditional multi-jaw chuck, this solution does not achieve clamping and fixing by gradually approaching, but achieves position adjustment by gradually approaching and locks the position of the cross-axis body by squeezing in another direction.

[0007] Preferably, the sliding pressure application assembly includes a jaw base plate, an adjustment turntable, a pressure application slider, and a driving disk. The jaw base plate is arranged on the rotation adjustment assembly. The jaw base plate is annularly and evenly provided with sliding grooves. The adjustment turntable is rotatably arranged in the jaw base plate. The adjustment turntable is provided with a threaded disk portion and an annular portion. The pressure application slider is snap-fitted and slidably arranged in the sliding groove. The thread track on the threaded disk portion is a spiral line. The pressure application slider is also provided with a thread matching the threaded disk portion. The driving disk is fixedly connected to the adjustment turntable.

[0008] In this solution, through the flexibly connected pressure application slider and limit slider, the device can be applicable to cross-axis bodies of different specifications and sizes (within a certain range), and can avoid the problem that the squeezing and fixing assembly cannot continue to drive after the positioning block and the cross part come into contact first.

[0009] As a further preference of the present invention, the self-centering limit assembly includes a limit slider, a positioning block, and a pressure application spring. The limit slider is snap-fitted and slidably arranged in the sliding groove. The pressure application spring is arranged between the limit slider and the pressure application slider. The positioning block is arranged below the limit slider. By tightening the positioning block, the positioning block will gradually approach the cross-axis body and abut against the side surface of the cross part.

[0010] By synchronously sliding and contracting the self-centering limit assembly to contact and squeeze the cross part of the cross-axis body, the position of the cross-axis body is adjusted, so that the middle hole part and the central screw are finally coaxially arranged.

[0011] Among them, the extrusion fixing component includes an extrusion shaft, a driving gear ring, a guiding disk and an extrusion locking column. The extrusion shaft is rotatably arranged in the driving disk. A driven gear is arranged on the extrusion shaft. The driving gear ring is fixedly connected to the circular ring part. The driven gear and the driving gear ring are in meshing transmission. A threaded shaft is also arranged on the extrusion shaft. The guiding disk is fixedly connected to the chuck base plate. Polygonal holes are evenly distributed in a circular shape on the guiding disk. The extrusion locking column is clamped and slidably arranged in the polygonal holes. The extrusion locking column and the threaded shaft are in threaded transmission.

[0012] Through the approach and extrusion of the extrusion locking column, the locking and fixing of the position of the cross shaft body can be completed.

[0013] Furthermore, the rotation adjustment component includes a bottom plate, a direct drive rotary motor and an adjustment turntable. The direct drive rotary motor is arranged on the bottom plate. The adjustment turntable is arranged on the rotating part of the direct drive rotary motor. A central screw is arranged on the adjustment turntable. The central screw and the chuck base plate are locked and fixed by threads.

[0014] The angle of the fixed cross shaft body can be adjusted by the direct drive rotary motor, so that the self-feeding grinding mechanism can be used for the processing of multiple finishing parts.

[0015] Furthermore, the self-feeding grinding mechanism includes a rotation drive component and an automatic feeding component. The rotation drive component is arranged on the rotation adjustment component. The automatic feeding component is slidably arranged on the rotation drive component.

[0016] When the self-feeding grinding mechanism starts the drive motor, it can not only drive the grinding tool to rotate at a high speed, but also automatically apply a flexible, continuous feeding force towards the finishing part to the grinding tool by compressing the feeding spring.

[0017] Preferably, the rotation drive component includes a base, a drive motor, a drive main shaft, a sleeve bracket and a sleeve body. The base is arranged on the bottom plate. The drive motor is arranged on the base. The drive main shaft is arranged on the output shaft of the drive motor. The drive main shaft is polygonal. The sleeve bracket is arranged on the base. The sleeve body is fixedly connected in the sleeve bracket.

[0018] As a further preference of the present invention, the automatic feeding component includes a sliding sleeve and a grinding tool. The inner hole of the sliding sleeve is polygonal and matches the drive main shaft. The sliding sleeve is clamped and slidably arranged on the drive main shaft. A tool holder is arranged at the end of the sliding sleeve. The grinding tool is detachably arranged on the tool holder.

[0019] The high-speed rotating grinding tool can process the finishing part after contacting the finishing part.

[0020] Wherein, an internal thread portion is provided on the sleeve body. The automatic feeding assembly further includes a sliding feeding seat and a feeding spring. The sliding feeding seat is engaged and slidably arranged on the driving main shaft. A threaded transmission is provided between the sliding feeding seat and the internal thread portion. The feeding spring is arranged between the sliding feeding seat and the sliding sleeve.

[0021] While the driving motor drives the grinding tool to rotate, the sliding feeding seat can compress the feeding spring through its own axial movement, so that the grinding tool always has a thrust force towards the finishing part. Under the action of this thrust force, the grinding tool can automatically complete the feed.

[0022] The beneficial effects achieved by the present invention with the above structure are as follows: (1) When the cross-axis self-centering chuck mechanism is continuously and unidirectionally rotationally driven, it can sequentially adjust the position of the cross-axis body and lock and fix it. Different from the traditional multi-jaw chuck, this solution does not achieve clamping and fixing by gradually approaching, but realizes position adjustment by gradually approaching and locks the position of the cross-axis body by extrusion in another direction.

[0023] (2) Through the pressure-applying slider and the limit slider connected by a flexible connection, this device can be applied to cross-axis bodies of different specifications and sizes (within a certain range), and can avoid the problem that the extrusion fixing component cannot continue to drive after the positioning block contacts the cross part first.

[0024] (3) The angle of the fixed cross-axis body can be adjusted by the direct-drive rotary motor, so that the self-feeding grinding mechanism can be used for the processing of multiple finishing parts.

[0025] (4) When the driving motor is started, the self-feeding grinding mechanism can not only drive the grinding tool to rotate at a high speed, but also automatically apply a flexible, continuous and feeding force towards the finishing part to the grinding tool by compressing the feeding spring.

[0026] (5) While the driving motor drives the grinding tool to rotate, the sliding feeding seat can compress the feeding spring through its own axial movement, so that the grinding tool always has a thrust force towards the finishing part. Under the action of this thrust force, the grinding tool can automatically complete the feed.

[0027] (6) After the position adjustment is completed, the pressure-applying spring will be compressed. On the one hand, it allows the pressure-applying slider to continue sliding after the position of the cross-axis body is adjusted to avoid the adjustment turntable from jamming. On the other hand, it can also improve the position stability of the cross-axis body through the elastic force of the pressure-applying spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional view of a positioning mechanism for the processing of an automotive universal joint proposed by the present invention; Figure 2 The front view of a positioning mechanism for machining an automotive universal joint proposed by the present invention; Figure 3 The top view of a positioning mechanism for machining an automotive universal joint proposed by the present invention; Figure 4 Is Figure 2 The sectional view along the cutting line A-A in Figure 5 Is Figure 2 The sectional view along the cutting line B-B in Figure 6 Is Figure 5 The sectional view along the cutting line C-C in Figure 7 The exploded structural schematic diagram of a positioning mechanism for machining an automotive universal joint proposed by the present invention; Figure 8 Is Figure 4 The partial enlarged view at position I in Figure 9 Is Figure 4 The partial enlarged view at position II in Figure 10 Is Figure 6 The partial enlarged view at position III in Figure 11 Is Figure 5 The partial enlarged view at position IV in Figure 12 Is Figure 7 The partial enlarged view at position V in

[0029] Wherein, 1. Cross-axis self-centering jaw mechanism, 2. Rotary adjustment assembly, 3. Self-feeding grinding mechanism, 4. Cross-axis body, 5. Sliding pressure application assembly, 6. Self-centering limit assembly, 7. Extrusion fixing assembly, 8. Jaw base plate, 9. Adjustment turntable, 10. Pressure application slider, 11. Driving disc, 12. Limit slider, 13. Positioning block, 14. Pressure application spring, 15. Extrusion shaft, 16. Active gear ring, 17. Guide disc, 18. Extrusion locking column, 19. Sliding groove, 20. Threaded disc part, 21. Ring part, 22. Driven gear, 23. Threaded shaft, 24. Polygonal hole, 25. Base plate, 26. Direct drive rotary motor, 27. Adjustment turntable, 28. Central screw, 29. Rotary drive assembly, 30. Automatic feeding assembly, 31. Base, 32. Driving motor, 33. Driving spindle, 34. Sleeve bracket, 35. Sleeve body, 36. Sliding sleeve, 37. Grinding tool, 38. Sliding feed seat, 39. Feed spring, 40. Internal threaded part, 41. Tool holder, 42. Middle hole part, 43. Cross part, 44. Finish machining part.

[0030] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation to the present invention. Detailed Description of the Invention

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present invention.

[0033] As Figures 1 to 12 shown, the present invention provides a positioning mechanism for machining an automotive universal joint, including a cross-axis self-centering chuck mechanism 1, a rotation adjustment assembly 2, a self-feeding grinding mechanism 3, and a cross-axis body 4. The cross-axis self-centering chuck mechanism 1 is arranged on the rotation adjustment assembly 2, and the self-feeding grinding mechanism 3 is arranged on the rotation adjustment assembly 2; The rotation adjustment assembly 2 includes a base plate 25, a direct-drive rotary motor 26, and an adjustment turntable 27. The direct-drive rotary motor 26 is arranged on the base plate 25, the adjustment turntable 27 is arranged on the rotating part of the direct-drive rotary motor 26, and a central screw 28 is arranged on the adjustment turntable 27. The central screw 28 and the chuck base plate 8 are locked and fixed by threads.

[0034] The cross-axis self-centering chuck mechanism 1 includes a sliding pressure application assembly 5, a self-centering limiting assembly 6, and a squeezing and fixing assembly 7. The sliding pressure application assembly 5 is arranged on the rotation adjustment assembly 2, the self-centering limiting assembly 6 is annularly and evenly arranged on the sliding pressure application assembly 5, and the squeezing and fixing assembly 7 is arranged on the sliding pressure application assembly 5.

[0035] When the cross-axis self-centering chuck mechanism 1 is continuously and unidirectionally rotationally driven, it can sequentially adjust the position and lock and fix the cross-axis body 4. Different from the traditional multi-jaw chuck, this solution does not achieve clamping and fixing by gradually approaching, but realizes position adjustment by gradually approaching and locks the position of the cross-axis body 4 by extrusion in another direction.

[0036] The sliding pressure application assembly 5 includes a jaw base plate 8, an adjustment turntable 9, a pressure application slider 10, and a drive disk 11. The jaw base plate 8 is arranged on the rotary adjustment assembly 2. The jaw base plate 8 is annularly and evenly provided with sliding grooves 19. The adjustment turntable 9 is rotatably arranged in the jaw base plate 8. The adjustment turntable 9 is provided with a threaded disk portion 20 and an annular portion 21. The pressure application slider 10 is snap-fitted and slidably arranged in the sliding groove 19. The thread track on the threaded disk portion 20 is a spiral line. The pressure application slider 10 is also provided with a thread matching the threaded disk portion 20. The drive disk 11 is fixedly connected to the adjustment turntable 9.

[0037] In this solution, through the pressure application slider 10 and the limit slider 12 connected by a flexible connection, the device can be applied to cross shaft bodies 4 of different specifications and sizes (within a certain range), and the problem that the extrusion fixing assembly 7 cannot continue to drive after the positioning block 13 and the cross portion 43 come into contact first can be avoided.

[0038] The self-centering limit assembly 6 includes a limit slider 12, a positioning block 13, and a pressure application spring 14. The limit slider 12 is snap-fitted and slidably arranged in the sliding groove 19. The pressure application spring 14 is arranged between the limit slider 12 and the pressure application slider 10. The positioning block 13 is arranged below the limit slider 12. Through the tightening of the positioning block 13, the positioning block 13 will gradually approach the cross shaft body 4 and abut against the side of the cross portion 43.

[0039] By synchronously sliding and contracting the self-centering limit assembly 6 to contact and squeeze the cross portion 43 of the cross shaft body 4, the position of the cross shaft body 4 is adjusted, so that the central hole portion 42 and the central screw rod 28 are finally coaxially arranged.

[0040] The extrusion fixing assembly 7 includes an extrusion shaft 15, a driving gear ring 16, a guide disk 17, and an extrusion locking column 18. The extrusion shaft 15 is rotatably arranged in the drive disk 11. The extrusion shaft 15 is provided with a driven gear 22. The driving gear ring 16 is fixedly connected to the annular portion 21. The driven gear 22 and the driving gear ring 16 are meshed and driven. The extrusion shaft 15 is also provided with a threaded shaft 23. The guide disk 17 is fixedly connected to the jaw base plate 8. The guide disk 17 is annularly and evenly provided with polygonal holes 24. The extrusion locking column 18 is snap-fitted and slidably arranged in the polygonal holes 24. The extrusion locking column 18 and the threaded shaft 23 are in threaded transmission.

[0041] Through the approach and extrusion of the extrusion locking column 18, the locking and fixing of the position of the cross shaft body 4 can be completed.

[0042] Through the direct drive rotary motor 26, the angle of the fixed cross shaft body 4 can be adjusted, so that the self-feeding grinding mechanism 3 can be used for the processing of multiple finishing parts 44.

[0043] The self-feeding grinding mechanism 3 includes a rotary drive assembly 29 and an automatic feeding assembly 30. The rotary drive assembly 29 is provided on the rotary adjustment assembly 2, and the automatic feeding assembly 30 is slidably provided on the rotary drive assembly 29.

[0044] When the drive motor 32 is started, the self-feeding grinding mechanism 3 can not only drive the grinding tool 37 to rotate at a high speed, but also automatically apply a flexible, continuous feeding force towards the finish machining part 44 to the grinding tool 37 by compressing the feeding spring 39.

[0045] The rotary drive assembly 29 includes a base 31, a drive motor 32, a drive spindle 33, a sleeve bracket 34 and a sleeve body 35. The base 31 is provided on the bottom plate 25, the drive motor 32 is provided on the base 31, the drive spindle 33 is provided on the output shaft of the drive motor 32, the drive spindle 33 is polygonal, the sleeve bracket 34 is provided on the base 31, and the sleeve body 35 is fixedly connected in the sleeve bracket 34.

[0046] The automatic feeding assembly 30 includes a sliding sleeve 36 and a grinding tool 37. The inner hole of the sliding sleeve 36 is polygonal and matches the drive spindle 33. The sliding sleeve 36 is engaged and slidably provided on the drive spindle 33. A tool holder 41 is provided at the end of the sliding sleeve 36, and the grinding tool 37 is detachably provided on the tool holder 41.

[0047] After the high-speed rotating grinding tool 37 contacts the finish machining part 44, it can machine the finish machining part 44.

[0048] An internal thread part 40 is provided on the sleeve body 35. The automatic feeding assembly 30 further includes a sliding feed seat 38 and a feed spring 39. The sliding feed seat 38 is engaged and slidably provided on the drive spindle 33. A threaded drive is provided between the sliding feed seat 38 and the internal thread part 40. The feed spring 39 is provided between the sliding feed seat 38 and the sliding sleeve 36.

[0049] While the drive motor 32 drives the grinding tool 37 to rotate, the sliding feed seat 38 can compress the feed spring 39 through its own axial movement, so that the grinding tool 37 always has a thrust force towards the finish machining part 44. Under the action of this thrust force, the grinding tool 37 can automatically complete the feed.

[0050] During specific use, first, when the cross shaft self-centering jaw mechanism 1 is removed, the cast cross shaft body 4 needs to be placed on the adjustment turntable 27 first. When placing it, the central screw 28 can be passed through the middle hole portion 42. Since this device is used to clamp cross shaft bodies 4 of different specifications, the inner diameter of the middle hole portion 42 is larger than that of the central screw 28. Then, the jaw base plate 8 can be installed on the top of the central screw 28 by means of threaded fit. Since the central screw 28 only has threads at one end at the top, the angle of the jaw base plate 8 relative to the adjustment turntable 27 is constant after being tightened.

[0051] Then, the adjustment turntable 9 is rotated by an external driving mechanism, and the driving methods include but are not limited to the following several: A: A pistol drill can be directly inserted into the central hole of the driving disk 11 to drive the adjustment turntable 9 to rotate through the driving disk 11. B: A gear ring can be arranged on the back of the threaded disk portion 20, and then the adjustment turntable 9 can be driven to rotate through the associated pinion gear.

[0052] When the adjustment turntable 9 rotates, through the threaded fit between the threaded disk portion 20 and the pressure application slider 10, each pressure application slider 10 will slide synchronously towards the central position along the sliding groove 19. When the pressure application slider 10 slides, it will push the limit slider 12 and the positioning block 13 to slide through the pressure application spring 14. If one end of the positioning block 13 first abuts against the side surface of the cross portion 43, then the cross shaft body 4 will rotate until both ends of the positioning block 13 abut against the side surface of the cross portion 43. When both ends of each positioning block 13 abut against the side surface of the cross portion 43, it means that the position adjustment of the cross shaft body 4 is completed at this time. After the position adjustment of the cross shaft body 4 is completed, the central axis coincides with the central axis of the central screw 28, and its own angle also matches that of the cross shaft self-centering jaw mechanism 1. Also, since the angle of the jaw base plate 8 relative to the adjustment turntable 27 is known, the position and angle of the cross shaft body 4 relative to the adjustment turntable 27 are both known after the position adjustment is completed.

[0053] At this time, when the adjustment turntable 9 continues to rotate, the pressure application slider 10 will continue to slide. However, since the limit slider 12 has abutted against the cross portion 43 and cannot slide, the pressure application spring 14 will be compressed at this time. On the one hand, it allows the pressure application slider 10 to continue sliding after the position adjustment of the cross shaft body 4 to avoid jamming of the adjustment turntable 9. On the other hand, it can also improve the position stability of the cross shaft body 4 through the elastic force of the pressure application spring 14.

[0054] While the adjustment dial 9 rotates, the driven gear 22 can also rotate through the active gear ring 16. Due to the threaded transmission between the threaded shaft 23 and the extrusion locking column 18, and the extrusion locking column 18 can only slide in the polygonal hole 24, the extrusion locking column 18 will gradually descend and approach the cross-shaft body 4 when the extrusion shaft 15 rotates. After the position adjustment of the cross-shaft body 4 is completed, the cross-shaft body 4 can be locked by squeezing the cross-shaft body 4 with the extrusion locking column 18.

[0055] After the cross shaft body 4 is completely fixed, the cross shaft self-centering claw mechanism 1 and the cross shaft body 4 can be angle-controlled by the direct-drive rotary motor 26, so that each finishing portion 44 corresponds to the self-feed grinding mechanism 3 in sequence; The driving motor 32 is started from slow to fast. At this time, the driving spindle 33 drives the sliding sleeve 36 to rotate, thereby driving the grinding tool 37 to rotate. At the same time, the rotating sliding feed seat 38 is axially displaced toward the direction where the grinding tool 37 is located by cooperating with the internal thread portion 40, until the sliding feed seat 38 is out of the range of the internal thread portion 40. At this time, the feed spring 39 is compressed. As the rotation speed of the driving spindle 33 increases, the high-speed rotating grinding tool 37 can grind and finish the finishing part 44 after contacting the finishing part 44. During this process, the elastic force of the feed spring 39 can serve as the driving force for the axial feed of the grinding tool 37.

[0056] After a fine-machined portion 44 is processed, the drive motor 32 is driven in reverse. Under the elastic force of the feed spring 39, the sliding feed seat 38 still has a tendency to reset to the internal threaded portion 40. When the sliding feed seat 38 and the internal threaded portion 40 are threadedly matched again, the sliding feed seat 38 will reset to the initial position. At this time, the tension of the feed spring 39 will lead the sliding sleeve 36 and the grinding tool 37 to complete the reset.

[0057] Then, the angle of the cross-axis body 4 is adjusted by the direct-drive rotary motor 26 , and the drive motor 32 is started again to process the next finishing portion 44 .

[0058] When the disassembly process of the cross shaft body 4 is completed, it is only necessary to rotate the adjustment dial 9 in the reverse direction to successively realize the unlocking and releasing of the clamping of the cross shaft body 4 .

[0059] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0060] The above describes the present invention and its embodiments, and this description is not restrictive. What is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In summary, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the present invention, design similar structural forms and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. A positioning mechanism for machining a universal joint of an automobile, characterized in that: It comprises a cross-axis self-centering claw mechanism (1), a rotation adjustment component (2), a self-feeding grinding mechanism (3) and a cross-axis body (4), wherein the cross-axis self-centering claw mechanism (1) is arranged on the rotation adjustment component (2), and the self-feeding grinding mechanism (3) is arranged on the rotation adjustment component (2); The cross-axis self-centering claw mechanism (1) comprises a sliding pressure component (5), a self-centering limit component (6) and a pressing and fixing component (7), wherein the sliding pressure component (5) is arranged on the rotation adjustment component (2), the self-centering limit component (6) is evenly arranged in an annular shape on the sliding pressure component (5), and the pressing and fixing component (7) is arranged on the sliding pressure component (5); The self-feeding grinding mechanism (3) comprises a rotary drive component (29) and an automatic feeding component (30); the rotary drive component (29) is arranged on the rotary adjustment component (2); and the automatic feeding component (30) is slidably arranged on the rotary drive component (29).

2. A positioning mechanism for machining a vehicle universal joint according to claim 1, characterized in that: The sliding pressure-applying assembly (5) comprises a claw base plate (8), an adjustment dial (9), a pressure-applying slider (10) and a driving disk (11); the claw base plate (8) is arranged on the rotation adjustment assembly (2); the claw base plate (8) is provided with sliding grooves (19) evenly distributed in an annular shape; the adjustment dial (9) is rotatably arranged in the claw base plate (8); the adjustment dial (9) is provided with a threaded disk portion (20) and a circular ring portion (21); and the pressure-applying slider (10) is slidably arranged in the sliding groove (19) in an engaged manner; The thread track on the threaded disc portion (20) is a spiral line, the pressure slider (10) is also provided with a thread matching the threaded disc portion (20), and the drive disc (11) is fixedly connected to the adjustment rotary disc (9).

3. A positioning mechanism for machining a vehicle universal joint according to claim 2, characterized in that: The self-centering limit assembly (6) comprises a limit slider (12), a positioning block (13) and a pressure spring (14); the limit slider (12) is slidably engaged in the sliding groove (19); the pressure spring (14) is arranged between the limit slider (12) and the pressure slider (10); the positioning block (13) is arranged below the limit slider (12); and by tightening the positioning block (13), the positioning block (13) will gradually approach the cross shaft body (4) and abut against the side of the cross portion (43).

4. A positioning mechanism for machining a vehicle universal joint according to claim 3, characterized in that: The extrusion fixing assembly (7) comprises an extrusion shaft (15), an active gear ring (16), a guide plate (17) and an extrusion locking column (18); the extrusion shaft (15) is rotatably arranged in the driving plate (11); a driven gear (22) is arranged on the extrusion shaft (15); the active gear ring (16) is fixedly connected to the annular portion (21); the driven gear (22) and the active gear ring (16) are meshed and transmitted; the extrusion shaft (15) is also provided with a threaded shaft (23); the guide plate (17) is fixedly connected to the claw base plate (8); polygonal holes (24) are evenly distributed in an annular pattern on the guide plate (17); the extrusion locking column (18) is slidably arranged in the polygonal hole (24); threaded transmission is performed between the extrusion locking column (18) and the threaded shaft (23).

5. The positioning mechanism for machining a vehicle universal joint according to claim 2, characterized in that: The rotary adjustment assembly (2) comprises a base plate (25), a direct-drive rotary motor (26) and an adjustment dial (27); the direct-drive rotary motor (26) is arranged on the base plate (25); the adjustment dial (27) is arranged on a rotating part of the direct-drive rotary motor (26); a central screw (28) is arranged on the adjustment dial (27); the central screw (28) and the claw base plate (8) are locked and fixed by means of threads.

6. A positioning mechanism for machining a vehicle universal joint according to claim 5, characterized in that: The rotary drive assembly (29) comprises a base (31), a drive motor (32), a drive spindle (33), a sleeve bracket (34) and a sleeve body (35); the base (31) is arranged on a bottom plate (25); the drive motor (32) is arranged on the base (31); the drive spindle (33) is arranged on an output shaft of the drive motor (32); the drive spindle (33) is polygonal; the sleeve bracket (34) is arranged on the base (31); and the sleeve body (35) is fixedly connected to the sleeve bracket (34).

7. A positioning mechanism for machining a vehicle universal joint according to claim 6, characterized in that: The automatic feeding assembly (30) comprises a sliding sleeve (36) and a grinding tool (37); the inner hole of the sliding sleeve (36) is a polygon matching the driving spindle (33); the sliding sleeve (36) is slidably mounted on the driving spindle (33); a tool holder (41) is provided at the end of the sliding sleeve (36); and the grinding tool (37) is detachably mounted on the tool holder (41).

8. A positioning mechanism for machining a vehicle universal joint according to claim 7, characterized in that: The sleeve body (35) is provided with an internal threaded portion (40), and the automatic feeding assembly (30) further includes a sliding feed seat (38) and a feed spring (39), the sliding feed seat (38) is slidably arranged on the driving main shaft (33), a threaded transmission is formed between the sliding feed seat (38) and the internal threaded portion (40), and the feed spring (39) is arranged between the sliding feed seat (38) and the sliding sleeve (36).

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