Transmission shaft universal joint mounting hole machining clamp

Abstract

The utility model discloses a transmission shaft universal joint mounting hole machining clamp, which relates to the technical field of universal joint machining, aims to solve the problem that transmission shaft universal joint mounting holes are difficult to machine, is arranged on a milling machine in a turnover manner, and comprises a turnover mechanism, a first limiting structure, a second limiting structure and a control device, the control device is connected with the turnover mechanism, the first limiting structure and the second limiting structure, the turnover mechanism is arranged on the milling machine, the output end of the turnover mechanism is provided with a turnover plate, the turnover plate is provided with a through hole used for installing a universal joint, and the first limiting structure is arranged at the upper end of the turnover plate and corresponds to the through hole; the first limiting structure is used for fixing the end, used for machining the mounting hole, of the universal joint, the first limiting structure comprises a first axial limiting structure and a first circumferential limiting structure, the second limiting structure is arranged at the lower end of the overturning plate in a floatable mode and corresponds to the through hole, and the second limiting structure is used for fixing the other end of the universal joint.

Description

Technical Field

[0001] The utility model relates to the technical field of universal joint processing, and more specifically to a clamp for processing a universal joint mounting hole of a transmission shaft. Background Art

[0002] Universal joints are components that achieve variable-angle power transmission and are used in locations where the direction of the transmission axis needs to be changed. They are the "joint" components of the universal transmission device of the automobile drive system. The combination of a universal joint and a transmission shaft is called a universal joint transmission device.

[0003] The universal joint includes a fork leg and a mounting head. Two ear holes on the same axis are set in the fork leg. According to the design requirements of the universal joint, the ear holes need to be machined to meet its design function. However, it is difficult to clamp the universal joint with current drilling equipment such as lathes and drilling machines. In addition, when manufacturing the universal joint, due to the lack of good processing tooling, the parts cannot be effectively positioned, the processing and production are inconvenient, and the production efficiency is low.

[0004] Therefore, how to solve the problem of difficult machining of the universal joint mounting hole of the transmission shaft is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a transmission shaft universal joint mounting hole processing fixture, which can realize adjustable positioning clamping of the universal joint, ensure the coaxiality and symmetry of the processed universal joint mounting hole, improve the yield rate of processing production, and at the same time improve production efficiency.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A transmission shaft universal joint mounting hole processing fixture, the fixture can be flipped and arranged on a milling machine, the fixture comprises:

[0008] A turning mechanism is arranged on the milling machine, and a turning plate is arranged at the output end of the turning mechanism, and the turning plate is provided with a through hole for installing a universal joint;

[0009] A first limiting structure is provided at the upper end of the flip plate and is arranged corresponding to the through hole. The first limiting structure is used to fix one end of the universal joint for processing the mounting hole. The first limiting structure includes a first axial limiting structure and a first circumferential limiting structure.

[0010] A second limiting structure is floatably disposed at the lower end of the flip plate and is disposed corresponding to the through hole, and the second limiting structure is used to fix the other end of the universal joint;

[0011] The control device is connected to the flipping mechanism, the first limiting structure and the second limiting structure.

[0012] Preferably, the first circumferential limiting structure includes:

[0013] A support column is arranged on the flip plate, and a mounting hole for mounting a universal joint is opened in the middle of the support column;

[0014] The limit plates are detachably arranged on both sides of the support column, and are used to fix both sides of the universal joint.

[0015] Preferably, the first axial limiting structure includes:

[0016] The first hydraulic cylinder is arranged on the flip plate. Two first hydraulic cylinders are provided and are located on both sides of the limit plate. The output end of the first hydraulic cylinder telescopically moves along the axial direction of the universal joint. The first hydraulic cylinder is connected to the control device and an articulated seat is provided on the first hydraulic cylinder.

[0017] A movable plate, one end of the movable plate is rotatably connected to the output end of the first hydraulic cylinder, and the other end of the movable plate is rotatably connected to a limit screw, the limit screw is arranged at the lower end of the movable plate, the limit screw is used to abut against and fix the universal joint, and a connecting rod extending axially is also provided on the movable plate, one end of the connecting rod is rotatably connected to the movable plate, and the other end of the connecting rod is rotatably connected to the hinge seat.

[0018] Preferably, a speed regulating valve is provided on the first hydraulic cylinder.

[0019] Preferably, the second limiting structure includes:

[0020] A fixing member connected to the lower end of the flip plate, the lower end of the fixing member is connected to the baffle, and a mounting groove is provided in the fixing member;

[0021] The bevel block is arranged to move along the installation groove, a moving long hole for matching the universal joint is arranged in the bevel block, the bottom end face of the bevel block is an inclined end face with an inclination, the side face of the bevel block is connected to the second hydraulic cylinder connected to the control device, and the output end of the second hydraulic cylinder moves along the radial direction of the universal joint;

[0022] The inclined block is movably arranged in the installation groove, moves along the axial direction of the universal joint, is located below the bevel block, the upper end surface of the inclined block is an inclined surface that matches the inclined end surface of the bevel block, and a movable spring sleeve is arranged in the inclined block.

[0023] Preferably, the upper end surface of the inclined block is provided with a track groove, and the lower end surface of the bevel block is provided with a guide rail, and the guide rail is movably arranged along the track groove.

[0024] Preferably, the upper end of the spring sleeve is an inverted conical structure, the interior of the inclined block is set as an inverted conical hole that cooperates with the spring sleeve, the lower end of the spring sleeve is a conical structure, and the baffle is set as a conical hole that cooperates with the spring sleeve.

[0025] Preferably, it also includes an oil circuit distributor connected to the hydraulic station, the oil circuit distributor is connected to the bridge plate through a rotating shaft, the bridge plate is connected to the adapter plate, a sealed countersunk head is provided on the adapter plate, the adapter plate is located at the lower end of the flip plate, and the rotating shaft, bridge plate and flip plate are all provided with connected oil circuit pipelines.

[0026] Preferably, the flipping mechanism comprises:

[0027] Support seats are arranged at both ends of the flip plate;

[0028] The servo motor is arranged in one of the support seats. The output end of the servo motor is connected to the rotating shaft to drive the rotating shaft to rotate. The rotating shaft is rotatably connected to the oil distributor through a bearing. The servo motor is connected to the control device.

[0029] Preferably, a sealing ring is provided on the outer periphery of the bearing.

[0030] The utility model provides a transmission shaft universal joint mounting hole processing fixture which can be flipped and arranged on a milling machine, the fixture comprises a flipping mechanism, a first limiting structure, a second limiting structure and a control device, specifically, the control device is connected with the flipping mechanism, the first limiting structure and the second limiting structure, the operation state of the flipping mechanism, the first limiting structure and the second limiting structure is controlled by the control device, the flipping mechanism is arranged on the milling machine and a flipping plate is provided at the output end, the operation of the flipping mechanism is controlled by the control device so that the flipping plate can be flipped, thereby realizing the processing of the two mounting holes of the universal joint.

[0031] The flip plate is provided with a through hole for installing the universal joint. When the universal joint needs to be processed for the installation hole, the universal joint is first inserted into the through hole on the flip plate. The first limiting structure is provided at the upper end of the flip plate and is arranged corresponding to the through hole. The first limiting structure is used to fix the end of the universal joint used for processing the installation hole. The end of the universal joint to be processed for the installation hole is limited by the first limiting structure. The first limiting structure includes a first axial limiting structure and a first circumferential limiting structure to achieve axial and circumferential positioning of the universal joint. The second limiting structure is floatingly provided at the lower end of the flip plate and is arranged corresponding to the through hole. The second limiting structure is used to fix the other end of the universal joint. When the universal joint is inserted into the through hole, the adjustable second limiting structure is controlled by the control device to achieve positioning of the end of the universal joint that is not processed for the installation hole.

[0032] The transmission shaft universal joint mounting hole processing fixture set up in the above manner is first inserted into the universal joint into the through hole on the flip plate, and the first limiting structure is controlled by the control device to fix one end of the universal joint mounting hole to be processed, and the second limiting structure is further controlled to fix the end of the universal joint where the mounting hole is not processed. Thereafter, the flip plate is flipped 90 degrees by controlling the flip mechanism to process the first mounting hole. After completion, the flip mechanism is continued to be controlled to flip the flip plate 360 ​​degrees to process the second mounting hole. In this way, the universal joint can be adjusted in positioning and clamping, thereby ensuring the coaxiality and symmetry of the processed universal joint mounting hole, improving the yield rate of processing and production, and at the same time improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0034] Figure 1 A schematic diagram of the structure of the transmission shaft universal joint mounting hole processing fixture provided by the utility model;

[0035] Figure 2 A schematic diagram of the structure of the support column provided by the utility model;

[0036] Figure 3 An exploded view of the transmission shaft universal joint mounting hole processing fixture provided by the utility model;

[0037] Figure 4 It is a partial schematic diagram of the transmission shaft universal joint mounting hole processing fixture provided by the utility model;

[0038] Figure 5 This is a structural schematic diagram of the oil circuit distributor provided by the utility model.

[0039] Reference numerals:

[0040] 1- flip mechanism, 11- flip plate;

[0041] 2-first limiting structure, 21-support column, 22-limiting plate, 23-first hydraulic cylinder, 24-hinged seat, 25-moving plate, 26-limiting screw, 27-connecting rod;

[0042] 3-second limiting structure, 31-fixing member, 32-baffle, 33-bevel block, 34-second hydraulic cylinder, 35-bevel block, 36-spring sleeve;

[0043] 4-Oil distributor;

[0044] 5- Rotating shaft;

[0045] 6-bridge board;

[0046] 7- Adapter plate. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] It should be noted that the directional words such as "up, down, front, back" etc. mentioned below are defined based on the drawings in the specification.

[0050] The core of the utility model is to provide a transmission shaft universal joint mounting hole processing fixture, which can realize adjustable positioning clamping of the universal joint, ensure the coaxiality and symmetry of the processed universal joint mounting hole, improve the yield rate of processing production, and improve production efficiency.

[0051] Please refer to Figure 1 A transmission shaft universal joint mounting hole processing fixture is flippable and is arranged on a milling machine. The fixture comprises a flipping mechanism 1, a first limiting structure 2, a second limiting structure 3 and a control device.

[0052] Specifically, the control device is connected to the flipping mechanism 1, the first limiting structure 2 and the second limiting structure 3. The operating status of the flipping mechanism 1, the first limiting structure 2 and the second limiting structure 3 are controlled by the control device. The flipping mechanism 1 is arranged on a milling machine and a flip plate 11 is provided at the output end. The flipping mechanism 1 is controlled to operate by the control device so that the flip plate 11 can be flipped, thereby realizing the processing of the two mounting holes of the universal joint.

[0053] The flip plate 11 is provided with a through hole for installing the universal joint. When the universal joint needs to be processed with the through hole, the universal joint is first inserted into the through hole on the flip plate 11. The first limiting structure 2 is provided at the upper end of the flip plate 11 and is arranged corresponding to the through hole. The first limiting structure 2 is used to fix the end of the universal joint used for processing the mounting hole. The end of the universal joint to be processed with the mounting hole is limited by the first limiting structure 2. The first limiting structure 2 includes a first axial limiting structure and a first circumferential limiting structure to achieve axial and circumferential positioning of the universal joint. The second limiting structure 3 is floatingly provided at the lower end of the flip plate 11 and is arranged corresponding to the through hole. The second limiting structure 3 is used to fix the other end of the universal joint. When the universal joint is inserted into the through hole, the adjustable second limiting structure 3 is controlled by the control device to achieve positioning of the end of the universal joint that is not processed with the mounting hole.

[0054] The fixture as a whole is installed on a milling machine and can be rotated 360 degrees to realize the processing of the two mounting holes of the universal joint.

[0055] The transmission shaft universal joint mounting hole processing fixture set up in the above manner is first inserted into the through hole on the flip plate 11, and the first limiting structure 2 is controlled by the control device to fix one end of the universal joint mounting hole to be processed, and the second limiting structure 3 is further controlled to fix the end of the universal joint that does not process the mounting hole, and then the flip plate 11 is flipped 90 degrees by controlling the flip mechanism 1 to process the first mounting hole. After completion, the flip mechanism 1 is continued to be controlled to flip the flip plate 11 360 degrees to process the second mounting hole. In this way, the universal joint can be adjusted and positioned, the coaxiality and symmetry of the processed universal joint mounting hole are ensured, the yield rate of processing and production is improved, and the production efficiency is improved at the same time.

[0056] Please refer to Figure 2 The first circumferential limiting structure includes a support column 21 and a limiting plate 22. The support column 21 is arranged on the flip plate 11. A mounting hole for installing the universal joint is opened in the middle of the support column 21. The limiting plate 22 is detachably arranged on both sides of the support column 21, and the limiting plate 22 is used to fix both sides of the universal joint.

[0057] It should be noted that the universal joint is first placed in the mounting hole of the support column 21, and then the limit plates 22 on both sides of the support column 21 are inserted into the support column 21 and fixed to the support column 21 with bolts to prevent deformation of the universal joint when processing the mounting holes on both sides.

[0058] In this embodiment, the support column 21 is a cylindrical structure, and a circular hole for installing a universal joint is provided in the middle of the support column 21, and square holes are provided on both sides of the circular hole. The side of the square hole is provided with a threaded hole passing through it. The limit plate 22 can be removably installed in the square hole, and is tightened and fixed to the support column 21 by the cooperation of screws and threaded holes.

[0059] In the above situation, the first axial limiting structure includes a first hydraulic cylinder 23, an articulated seat 24, a movable plate 25, a limit screw 26 and a connecting rod 27. The first hydraulic cylinder 23 is arranged on the flip plate 11 and is connected to the control device. The first hydraulic cylinder 23 is provided with two and is located on both sides of the limit plate 22. The output end of the first hydraulic cylinder 23 moves telescopically along the axial direction of the universal joint. The first hydraulic cylinder 23 is provided with an articulated seat 24. One end of the movable plate 25 is rotatably connected to the output end of the first hydraulic cylinder 23, and the other end of the movable plate 25 is rotatably connected to the limit screw 26. The limit screw 26 is arranged at the lower end of the movable plate 25 and is used to abut against the fixed universal joint. The movable plate 25 is also provided with a connecting rod 27 extending along the axial direction. One end of the connecting rod 27 is rotatably connected to the movable plate 25, and the other end of the connecting rod 27 is rotatably connected to the articulated seat 24.

[0060] It can be understood that the universal joint is first placed in the mounting hole of the support column 21, and then the first hydraulic cylinders 23 on both sides of the support column 21 are controlled by the control device to operate, and the first hydraulic cylinder 23, the movable plate 25, the limit screws 26 and the connecting rod 27 cooperate to use the principle of the lever to press the universal joint with the limit screws 26 on the support column 21 to prevent the universal joint from moving, and then limit plates 22 are placed on both sides of the universal joint to prevent the universal joint from deforming when processing the mounting holes on both sides.

[0061] When it is necessary to use the first limiting structure 2 for limiting, the universal joint is first placed in the mounting hole of the support column 21, and then the control device is used to control the output ends of the first hydraulic cylinders 23 on both sides of the support column 21 to extend upward, and using the lever principle, the limiting screws 26 move downward to press the universal joint on the support column 21 to prevent the universal joint from moving. After that, the limiting plates 22 on both sides of the universal joint are used to limit the circumference of the universal joint to prevent the universal joint from deforming when the mounting holes on both sides are processed; when the mounting holes on both sides of the universal joint are processed, the control device controls the output end of the first hydraulic cylinder 23 to retract downward, and uses the lever principle to move the limiting screws 26 upward to release the axial limit on the universal joint, so that the universal joint can be smoothly removed from the mounting hole of the support column 21.

[0062] Furthermore, a speed regulating valve is provided on the first hydraulic cylinder 23 .

[0063] It should be noted that the positions of the first hydraulic cylinders 23 on both sides of the support column 21 are different, so the oil pressure entering the first hydraulic cylinder 23 is different, and the speed of driving the first hydraulic cylinder 23 to run is also different. In order to ensure the consistency of the running speed of the first hydraulic cylinders 23 on both sides of the support column 21, the speed regulating valve on the first hydraulic cylinder 23 is adjusted to make the running speed of the first hydraulic cylinders 23 on both sides of the support column 21 consistent.

[0064] Please refer to Figure 3 and Figure 4The second limiting structure 3 includes a fixing member 31, a baffle 32, a bevel block 33, a second hydraulic cylinder 34, a bevel block 35 and a spring sleeve 36. The fixing member 31 is connected to the lower end of the flip plate 11, and the lower end of the fixing member 31 is connected to the baffle 32. A mounting groove is provided in the fixing member 31, and the bevel block 33 is movably arranged along the mounting groove. A movable long hole for matching the universal joint is provided in the bevel block 33. The bottom end surface of the bevel block 33 is an inclined end surface with an inclination. The side surface of the bevel block 33 is connected to the second hydraulic cylinder 34 connected to the control device. The output end of the second hydraulic cylinder 34 is telescopically movable along the radial direction of the universal joint. The bevel block 35 is movably arranged in the mounting groove. The bevel block 35 moves along the axial direction of the universal joint. The bevel block 35 is located below the bevel block 33. The upper end surface of the bevel block 35 is an inclined surface matching the inclined end surface of the bevel block 33. A movable spring sleeve 36 is provided in the bevel block 35.

[0065] It can be understood that when the universal joint is limited by the second limiting structure 3, the control device controls the operation of the second hydraulic cylinder 34 so that the output end of the second hydraulic cylinder 34 extends radially along the universal joint to drive the bevel block 33 to push forward. The bevel block 33 is inclined. The further it is pushed forward, the more the bevel block 33 is squeezed downward, and it will squeeze the inclined block 35. When the inclined block 35 is squeezed downward, the spring sleeve 36 can be squeezed toward the center of the universal joint. There is a baffle 32 under the spring sleeve 36 to prevent the spring sleeve 36 from falling down. When the mounting holes on both sides of the universal joint are processed, the control device controls the output ends of the two hydraulic cylinders to contract along the radial direction of the universal joint to drive the bevel block 33 to withdraw backward. The bevel block 33 is inclined. The further it moves backward, the more it moves upward, which will remove the squeeze on the bevel block 35. When the bevel block 33 is separated from the bevel block 35, the universal joint can be directly pulled out of the second limiting structure 3. During the pulling out process, it will not detach from the second limiting structure 3 due to the restriction of the fixing member 31 and the baffle 32.

[0066] Due to the length of the universal joint, in order to prevent the lower part from moving when processing the upper part of the universal joint and affecting the overall symmetry tolerance, fixation is achieved at the lower part through a second limiting structure 3.

[0067] On the basis of the above embodiment, the upper end surface of the inclined block 35 is provided with a track groove, and the lower end surface of the bevel block 33 is provided with a guide rail, and the guide rail is movably arranged along the track groove.

[0068] It should be noted that there is a guide rail under the bevel block 33, and a track groove is provided on the upper end surface of the bevel block 35. When the second hydraulic cylinder 34 is controlled by the control device, the guide rail of the bevel block 33 can be driven to move along the track groove of the bevel block 35 to realize the movement between the bevel block 33 and the bevel block 35.

[0069] In the above embodiment, the upper end of the spring sleeve 36 is an inverted conical structure, the interior of the inclined block 35 is set as an inverted conical hole that cooperates with the spring sleeve 36, the lower end of the spring sleeve 36 is a conical structure, and the baffle 32 is set as a conical hole that cooperates with the spring sleeve 36.

[0070] It can be understood that the interior of the bevel block 35 is inverted cone-shaped to match the inverted cone-shaped structure of the upper end of the spring sleeve 36. There is a baffle 32 under the spring sleeve 36, which is also tapered. When the bevel block 33 is squeezed downward, the baffle 32 can also work at the same time, thereby avoiding deformation of the spring sleeve 36.

[0071] Among them, in this embodiment, the spring sleeve 36, the inclined block 35 and the baffle 32 are arranged in this way, but in practical applications, there is no limitation to this, as long as the above technical effects can be achieved.

[0072] Please refer to Figure 5 , and also includes an oil circuit distributor 4 connected to the hydraulic station, the oil circuit distributor 4 is connected to the bridge plate 6 through a rotating shaft 5, the bridge plate 6 is connected to the adapter plate 7, a sealed countersunk head is provided on the adapter plate 7, the adapter plate 7 is located at the lower end of the flip plate 11, and the rotating shaft 5, the bridge plate 6 and the flip plate 11 are all provided with connected oil circuit pipelines.

[0073] It should be noted that because the entire fixture needs to rotate 360 ​​degrees and needs to be refueled, an oil circuit distributor 4 is designed. When the oil enters the oil circuit distributor 4, it reaches the bridge plate 6 through the rotating shaft 5. There are symmetrical oil circuit pipelines inside the rotating shaft 5 and the bridge plate 6. The oil will flow backward to the adapter plate 7. The adapter plate 7 will be provided with a countersunk head and sealed with an O-ring to prevent oil leakage. The oil on the adapter plate 7 goes up to the flip plate 11. The oil circuit setting of the flip plate 11 can reach places where oil is needed, such as the hydraulic cylinder.

[0074] In the above situation, the flipping mechanism 1 includes a support seat and a servo motor. The support seats are arranged at both ends of the flipping plate 11. The servo motor is arranged in one of the support seats. The output end of the servo motor is connected to the rotating shaft 5 to drive the rotating shaft 5 to rotate. The rotating shaft 5 is rotatably connected to the oil circuit distributor 4 through a bearing, and the servo motor is connected to the control device.

[0075] It is understandable that after drilling a hole on one side of the universal joint, the control device controls the servo motor to rotate the shaft 5, and the shaft 5 drives the flip plate 11 to flip 360 degrees to further drill a hole on the other side of the universal joint.

[0076] In the above embodiment, a sealing ring is provided on the outer periphery of the bearing.

[0077] It should be noted that by providing a sealing ring at the bearing, oil sealing can be achieved and oil leakage and pressure leakage can be avoided.

[0078] In summary, the transmission shaft universal joint mounting hole processing fixture provided by the utility model is installed on a milling machine, and the clamping of the universal joint can realize adjustable positioning clamping of the universal joint, which is used to fix the product, facilitate processing, improve the yield rate of processing and production, and at the same time improve production efficiency, and ensure the coaxiality and symmetry of the processed universal joint mounting hole.

[0079] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0080] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0081] The above is a detailed introduction to a drive shaft universal joint mounting hole processing fixture provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A transmission shaft universal joint mounting hole processing fixture, characterized in that: The fixture is flippably arranged on a milling machine, and the fixture comprises: A turning mechanism (1) is arranged on the milling machine, the output end of the turning mechanism (1) is provided with a turning plate (11), and the turning plate (11) is provided with a through hole for mounting a universal joint; a first limiting structure (2), arranged at the upper end of the flip plate (11) and arranged corresponding to the through hole, the first limiting structure (2) being used to fix one end of the universal joint for machining the mounting hole, the first limiting structure (2) comprising a first axial limiting structure and a first circumferential limiting structure; A second limiting structure (3) is floatably disposed at the lower end of the flip plate (11) and is arranged corresponding to the through hole, and the second limiting structure (3) is used to fix the other end of the universal joint; A control device is connected to the flipping mechanism (1), the first limiting structure (2) and the second limiting structure (3).

2. The transmission shaft universal joint mounting hole processing fixture according to claim 1, characterized in that: The first circumferential limiting structure comprises: A support column (21) is arranged on the flip plate (11), and a mounting hole for mounting the universal joint is provided in the middle of the support column (21); The limiting plates (22) are detachably arranged on both sides of the support column (21), and the limiting plates (22) are used to fix the two sides of the universal joint.

3. The transmission shaft universal joint mounting hole processing fixture according to claim 2, characterized in that: The first axial limiting structure comprises: A first hydraulic cylinder (23) is provided on the flip plate (11); two first hydraulic cylinders (23) are provided and are located on both sides of the limit plate (22); an output end of the first hydraulic cylinder (23) telescopically moves along the axial direction of the universal joint; the first hydraulic cylinder (23) is connected to the control device; and a hinge seat (24) is provided on the first hydraulic cylinder (23); A movable plate (25), one end of the movable plate (25) is rotatably connected to the output end of the first hydraulic cylinder (23), the other end of the movable plate (25) is rotatably connected to a limit screw (26), the limit screw (26) is provided at the lower end of the movable plate (25), the limit screw (26) is used to abut and fix the universal joint, and the movable plate (25) is also provided with a connecting rod (27) extending in the axial direction, one end of the connecting rod (27) is rotatably connected to the movable plate (25), and the other end of the connecting rod (27) is rotatably connected to the hinge seat (24).

4. The transmission shaft universal joint mounting hole processing fixture according to claim 3, characterized in that: The first hydraulic cylinder (23) is provided with a speed regulating valve.

5. The transmission shaft universal joint mounting hole processing fixture according to claim 4, characterized in that: The second limiting structure (3) comprises: A fixing member (31) connected to the lower end of the flip plate (11), the lower end of the fixing member (31) being connected to the baffle plate (32), and a mounting groove being provided in the fixing member (31); A bevel block (33) is movably arranged along the mounting groove, a movable long hole for cooperating with the universal joint is provided in the bevel block (33), a bottom end surface of the bevel block (33) is an inclined end surface with an inclination, a side surface of the bevel block (33) is connected to a second hydraulic cylinder (34) connected to the control device, and an output end of the second hydraulic cylinder (34) moves in a radial direction of the universal joint; An inclined block (35) is movably arranged in the mounting groove. The inclined block (35) moves along the axial direction of the universal joint. The inclined block (35) is located below the bevel block (33). The upper end surface of the inclined block (35) is an inclined surface that matches the inclined end surface of the bevel block (33). A movable spring sleeve (36) is arranged in the inclined block (35).

6. The transmission shaft universal joint mounting hole processing fixture according to claim 5, characterized in that: The upper end surface of the inclined block (35) is provided with a track groove, and the lower end surface of the bevel block (33) is provided with a guide rail, and the guide rail is movably arranged along the track groove.

7. The transmission shaft universal joint mounting hole processing fixture according to claim 6, characterized in that: The upper end of the spring sleeve (36) is an inverted conical structure, the interior of the inclined block (35) is provided with an inverted conical hole matching the spring sleeve (36), the lower end of the spring sleeve (36) is a conical structure, and the baffle (32) is provided with a conical hole matching the spring sleeve (36).

8. The transmission shaft universal joint mounting hole processing fixture according to claim 7, characterized in that: It also includes an oil circuit distributor (4) connected to the hydraulic station, the oil circuit distributor (4) being connected to the bridge plate (6) via a rotating shaft (5), the bridge plate (6) being connected to an adapter plate (7), the adapter plate (7) being provided with a sealed countersunk head, the adapter plate (7) being located at the lower end of the flip plate (11), and the rotating shaft (5), the bridge plate (6) and the flip plate (11) being provided with interconnected oil circuit pipelines.

9. The transmission shaft universal joint mounting hole processing fixture according to claim 8, characterized in that: The turning mechanism (1) comprises: Support seats, arranged at both ends of the flip plate (11); A servo motor is disposed in one of the support seats, the output end of the servo motor is connected to the rotating shaft (5) to drive the rotating shaft (5) to rotate, the rotating shaft (5) is rotatably connected to the oil distributor (4) via a bearing, and the servo motor is connected to the control device.

10. The transmission shaft universal joint mounting hole processing fixture according to claim 9, characterized in that: A sealing ring is arranged on the outer periphery of the bearing.

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