An automobile drive shaft dynamic balance detection device

Abstract

The present invention discloses a dynamic balance detection device for an automobile drive shaft, belonging to the technical field of drive shaft detection, including a detection table. The detection table is provided with two moving blocks, and a dynamic balance detection device is installed on one of the moving blocks. This device is equipped with a rotating first electric gripper; in the present invention, through the transmission cooperation among the first bevel gear, the second bevel gear, and the third bevel gear in the coaxial positioning mechanism, when the first bevel gear is driven, it can drive the second bevel gear to rotate, and then make the third bevel gear rotate in the opposite direction to the first bevel gear. This transmission process can make the second rotating rod under the driving rod and the first rotating rod under the driving sleeve rotate. Their rotation can drive the positioning clamping blocks at both ends to clamp the two parts of the drive shaft divided by the universal joint as the grading line, which ensures the horizontal transmission of the drive shaft, improves the coaxiality of the universal joint, and reduces the interference with the detection of the middle section.

Description

Technical Field

[0001] The present invention belongs to the technical field of drive shaft detection, and particularly relates to a dynamic balance detection device for an automotive drive shaft. Background Art

[0002] In the field of modern mechanical engineering, as a core component for power transmission, the dynamic balance performance of a drive shaft plays a decisive role in the stable operation of mechanical equipment. Once there is a problem with the dynamic balance of the drive shaft, during high-speed rotation, it will cause severe vibration and noise, which will not only reduce the working efficiency of the equipment, but also may lead to premature wear of the equipment components, and even cause serious safety accidents. Therefore, accurate dynamic balance detection of the drive shaft is a key link to ensure the normal operation of mechanical equipment.

[0003] Currently, the dynamic balance detection of drive shafts usually adopts a clamping method at both ends, so that during the rotation of the drive shaft, vibration data is collected by a detection device to evaluate its balance state. However, when the drive shaft is long and equipped with a universal joint, the detection process will face many challenges.

[0004] The main function of the universal joint is to transmit power between shafts at different angles, but its special structure and working mode pose obstacles to the dynamic balance detection of the middle section of the drive shaft. During the horizontal detection process, the moving characteristics of the universal joint cause it to generate complex swings and displacements during the rotation of the drive shaft. This irregular movement may cause the detection signal to be severely interfered, and it is difficult for the detection device to capture the true vibration situation of the middle section. In addition, the presence of the universal joint also changes the mass distribution and moment of inertia of the drive shaft, making the traditional detection algorithm based on a fixed structure model unable to accurately calculate the unbalance amount of the middle section.

[0005] To avoid the above technical problems, it is indeed necessary to provide a dynamic balance detection device for an automotive drive shaft to overcome the defects in the prior art. Summary of the Invention

[0006] The purpose of the present invention is to provide a dynamic balance detection device for an automotive drive shaft to solve the problems raised in the above background art.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A dynamic balance detection device for an automotive drive shaft, including a detection table, the detection table is provided with two moving blocks, a dynamic balance detection device is installed on one side of the moving block, and this device, through a rotating first electric gripper, and a second electric gripper rotating on the other side of the moving block jointly clamp the drive shaft;

[0008] Two coaxial positioning mechanisms are provided on the inspection table. The mechanism includes a U-shaped connecting plate, in which a first bevel gear, a second bevel gear and a third bevel gear are respectively rotatably arranged. The first bevel gear and the third bevel gear are respectively meshed with the second bevel gear. The bottom of the first bevel gear is connected to a first rotating rod through a driving rod, and the inside of the third bevel gear is rotatably arranged on the first rotating rod through a driving sleeve, and the bottom end of the driving sleeve is connected to a second rotating rod. The first rotating rod and the second rotating rod are distributed in an X shape, and positioning clamp blocks are rotatably installed at their ends. A plurality of side rotating rollers are rotatably arranged on each positioning clamp block.

[0009] As a preferred embodiment, a vertical frame is fixedly installed on the inspection table, a hydraulic rod is fixedly installed on the vertical frame, the bottom end of the hydraulic rod is connected with a first driving motor, the output shaft of the first driving motor is connected with a cross frame, and the two coaxial positioning mechanisms are respectively fixedly installed on the cross frame through U-shaped connecting plates.

[0010] As a preferred embodiment, a worm gear is connected to the rotating part at the top of the U-shaped connecting plate of each first bevel gear. Two worm shafts are rotatably arranged on both sides of the cross frame. Each worm shaft is respectively meshed with the worm gear on the corresponding side. Two second driving motors respectively drivingly connected to the worm shafts are also installed on the cross frame. When the second driving motor is started, it will drive the rotation of the worm gear through the rotation of the worm shaft.

[0011] As a preferred embodiment, a moving groove is formed on the inspection table, a positioning sliding rod is fixedly arranged in the moving groove, two threaded rods are rotatably arranged in the inspection table, the adjacent ends of the two threaded rods are connected, and the thread directions on the two threaded rods are opposite. The inner parts of the two moving blocks are respectively threadedly connected to the threaded rods on the corresponding sides, and their inner parts are respectively slidably connected to the positioning sliding rod.

[0012] As a preferred embodiment, a third driving motor drivingly connected to the end of one side threaded rod is installed at one end of the inspection table. Driven by the third driving motor, the two threaded rods can be driven to rotate, and then the two moving blocks can be driven to move relatively through the opposite threads on the two threaded rods.

[0013] As a preferred embodiment, a middle section detection mechanism is arranged on the cross frame.

[0014] As a preferred embodiment, the middle section detection mechanism includes a contact detection device. Two telescopic rods are fixedly arranged on the lower surface of the contact detection device. A connecting block is fixedly arranged at the bottom ends of the two telescopic rods. A spring is arranged between the contact detection device and the connecting block.

[0015] As a preferred embodiment, a bottom contact plate is installed at the bottom of the connection block, a touch block is arranged on the connection block, and a contact detection part corresponding to the touch block is arranged on the lower surface of the contact detection device. When the bottom contact plate is jacked up due to movement with the contact surface, it will drive the touch block to touch the contact detection part, so that the contact detection device can detect the number of times of its contact.

[0016] As a preferred embodiment, a plurality of contact balls are arranged on the bottom contact plate.

[0017] As a preferred embodiment, a multi-stage electric push rod and a support slide rod are fixedly installed on the cross frame. One end of the multi-stage electric push rod is connected to the middle section detection mechanism, and the top of the middle section detection mechanism is slidably arranged on the support slide rod. Driven by the multi-stage electric push rod, the middle section detection mechanism can be driven to move horizontally.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] In the present invention, through the transmission cooperation among the first bevel gear, the second bevel gear and the third bevel gear in the coaxial positioning mechanism, when the first bevel gear is driven, the second bevel gear can be driven to rotate, so that the third bevel gear rotates in the opposite direction to the first bevel gear. This transmission process can make the second rotating rod below the driving rod and the first rotating rod below the driving sleeve rotate. Their rotation can drive the positioning clamping blocks at both ends to clamp the two parts of the transmission shaft divided by the universal joint as the grading line, which ensures the horizontal transmission of the transmission shaft, improves the coaxiality of the universal joint, and reduces the interference with the middle section detection. In addition, a plurality of side rotating rollers rotatably arranged on each positioning clamping block can reduce the friction when the transmission shaft rotates, so that the transmission shaft can rotate smoothly synchronously when rotating, ensure the accuracy of the detection data, improve the dynamic balance detection accuracy of the transmission shaft, and help the mechanical equipment to operate stably.

[0020] In the present invention, when the second driving motor is started, the worm can drive the worm wheel to rotate, and then the first bevel gear rotates, realizing the stable clamping and positioning of the transmission shaft. When the transmission shaft needs to be replaced for detection, the clamping of the transmission shaft by the first electric claw and the second electric claw can be released, and under the drive of the third driving motor, the two moving blocks can be driven to move relatively by the rotation of the threaded rod, so that the transmission shaft can be automatically separated. Because the transmission shaft is picked up by the clamping of the coaxial positioning mechanisms on both sides, and driven by the first driving motor, the cross frame drives the transmission shaft clamped by the coaxial positioning mechanisms on both sides to rotate and change direction, so as to perform the replacement dynamic balance detection at the dynamic balance detection device. This design not only helps to achieve the accuracy of the overall detection of the transmission shaft through the detection of both ends of the transmission shaft, but also greatly simplifies the commutation operation in the detection process and improves the detection efficiency.

[0021] In the present invention, the bottom contact plate is attached to the middle section surface of the transmission shaft through contact balls. The contact balls can reduce the friction during contact and ensure the accuracy of detection. When the transmission shaft deviates during high-speed rotation, the bottom contact plate will be lifted, and then the touch block will be driven to move upward by the connection block and touch the contact detection part. During this process, the number of times the contact detection part is contacted will be recorded at the contact detection device, thereby realizing the detection of the middle section of the transmission shaft. In addition, the telescoping of the multi-stage electric push rod can drive the overall middle section detection mechanism to perform a lateral displacement, enabling the detection of different positions of the middle section of the transmission shaft, thereby reducing the detection influence caused by the universal joint on the mass distribution and moment of inertia of the transmission shaft. Together with the transposition detection at both ends of the transmission shaft, detection data can be obtained from multiple angles and positions, which helps to comprehensively and accurately evaluate the dynamic balance state of the transmission shaft. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the front three-dimensional structure of the present invention;

[0024] Figure 3 It is a schematic diagram of the top three-dimensional structure of the present invention;

[0025] Figure 4 It is a schematic diagram of the partial three-dimensional structure of the present invention;

[0026] Figure 5 It is a schematic diagram of the three-dimensional structure of the transmission shaft of the present invention;

[0027] Figure 6 It is a schematic diagram of the three-dimensional structure of the coaxial positioning mechanism of the present invention;

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of the positioning clamp block of the present invention;

[0029] Figure 8 It is a schematic diagram of the three-dimensional structure of the first bevel gear of the present invention;

[0030] Figure 9 It is a schematic diagram of the three-dimensional structure of the middle section detection mechanism of the present invention;

[0031] Figure 10 It is a schematic diagram of the three-dimensional structure of the contact detection part of the present invention;

[0032] Figure 11 It is a schematic diagram of the three-dimensional structure of the contact ball of the present invention.

[0033] In the figure: 1, detection table; 2, moving block; 3, dynamic balance detection device; 4, first electric gripper; 5, second electric gripper; 6, transmission shaft; 7, coaxial positioning mechanism; 71, U-shaped connecting plate; 72, first bevel gear; 73, second bevel gear; 74, third bevel gear; 75, driving rod; 76, first rotating rod; 77, driving sleeve; 78, second rotating rod; 79, positioning clamping block; 710, side rotating roller; 711, worm gear; 712, worm; 713, second driving motor; 8, vertical frame; 9, hydraulic rod; 10, first driving motor; 11, horizontal frame; 12, moving groove; 13, positioning slide bar; 14, threaded rod; 15, third driving motor; 16, middle section detection mechanism; 161, contact detection device; 162, telescopic rod; 163, connecting block; 164, spring; 165, bottom contact plate; 166, touch block; 167, contact detection part; 168, contact rolling ball; 17, multi-stage electric push rod; 18, support slide bar. Detailed implementation manners

[0034] The present invention will be further described below in conjunction with embodiments.

[0035] The following embodiments are used to illustrate the present invention, but cannot be used to limit the protection scope of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions. Any simple improvement of the method of the present invention under the premise of the conception of the present invention belongs to the scope of protection required by the present invention.

[0036] Please refer to Figures 1-11 , the present invention provides a dynamic balance detection device for an automotive transmission shaft, including a detection table 1. The detection table 1 is provided with two moving blocks 2. A dynamic balance detection device 3 is installed on one side of the moving block 2. The device clamps the transmission shaft 6 together with the second electric gripper 5 rotating on the other side of the moving block 2 through the rotating first electric gripper 4;

[0037] Two coaxial positioning mechanisms 7 are provided on the detection table 1. This mechanism includes a U-shaped connecting plate 71. In the U-shaped connecting plate 71, a first bevel gear 72, a second bevel gear 73, and a third bevel gear 74 are respectively rotatably provided. The first bevel gear 72 and the third bevel gear 74 are respectively meshed with the second bevel gear 73. The bottom of the first bevel gear 72 is connected to a first rotating rod 76 through a driving rod 75. The inside of the third bevel gear 74 is rotatably provided on the first rotating rod 76 through a driving sleeve 77. The bottom end of the driving sleeve 77 is connected to a second rotating rod 78. The first rotating rod 76 and the second rotating rod 78 are distributed in an X shape, and positioning clamp blocks 79 are rotatably installed at their ends. A plurality of side rotating rollers 710 are rotatably provided on each positioning clamp block 79. Through the transmission cooperation among the first bevel gear 72, the second bevel gear 73, and the third bevel gear 74 in the coaxial positioning mechanism 7, when the first bevel gear 72 is driven, it can drive the second bevel gear 73 to rotate, and then the third bevel gear 74 rotates in the opposite direction to the first bevel gear 72. This transmission process can make the second rotating rod 78 below the driving rod 75 and the first rotating rod 76 below the driving sleeve 77 rotate. Since the first rotating rod 76 and the second rotating rod 78 are distributed in an X shape, their rotation can drive the positioning clamp blocks 79 at both ends to clamp the two parts of the transmission shaft 6 divided by the universal joint as the grading line. In this way, the horizontal transmission effect of the transmission shaft 6 can be guaranteed, the coaxiality of the universal joint during the overall rotation can be significantly improved, and the influence on the middle section during the dynamic balance detection of the universal joint when the transmission shaft 6 rotates can be effectively reduced. In addition, the plurality of side rotating rollers 710 rotatably provided on each positioning clamp block 79 can reduce the friction when the transmission shaft 6 rotates, so that the transmission shaft 6 can rotate smoothly synchronously when rotating, ensuring that the data obtained during the process of the dynamic balance detection device 3 driving the transmission shaft 6 to rotate through the first electric claw 4 is more accurate and reliable, thereby improving the accuracy and effectiveness of the dynamic balance performance detection of the transmission shaft 6 and providing strong support for ensuring the stable operation of mechanical equipment.

[0038] As Figure 2 and Figure 5 shown, a vertical frame 8 is fixedly installed on the detection table 1. A hydraulic rod 9 is fixedly installed on the vertical frame 8. The bottom end of the hydraulic rod 9 is connected to a first driving motor 10. The output shaft of the first driving motor 10 is connected to a cross frame 11. The two coaxial positioning mechanisms 7 are respectively fixedly installed on the cross frame 11 through the U-shaped connecting plate 71.

[0039] As Figures 6 to 8 shown, a worm gear 711 is connected to the rotating part at the top of the U-shaped connecting plate 71 for each first bevel gear 72. Two worm shafts 712 are rotatably provided on both sides of the cross frame 11. Each worm shaft 712 is respectively meshed with the worm gear 711 on the corresponding side. Two second driving motors 713 respectively drivingly connected to the worm shafts 712 are also installed on the cross frame 11. When the second driving motor 713 is started, it will drive the rotation of the worm gear 711 through the rotation of the worm shaft 712.

[0040] As Figure 3 and Figure 4 shown, a moving groove 12 is formed in the detection table 1, a positioning slide bar 13 is fixedly arranged in the moving groove 12, two threaded rods 14 are rotatably arranged in the detection table 1, the adjacent ends of the two threaded rods 14 are connected, and the thread directions on the two threaded rods 14 are opposite. The inner parts of the two moving blocks 2 are respectively threadedly connected to the corresponding threaded rods 14 on the corresponding sides, and their inner parts are both slidably connected to the positioning slide bar 13.

[0041] As Figure 3 and Figure 4 shown, a third driving motor 15 is installed at one end of the detection table 1 and is drivingly connected to the end of one side of the threaded rod 14. Driven by the third driving motor 15, the two threaded rods 14 can be driven to rotate, and then the two moving blocks 2 can be driven to move relatively through the opposite threads on the two threaded rods 14. When the second driving motor 713 is started, the worm 712 can drive the worm wheel 711 to rotate, and then the first bevel gear 72 can be rotated to realize the clamping and positioning of the transmission shaft 6. At the same time, due to the self-locking property between the worm 712 and the worm wheel 711, the positioning and clamping of the positioning clamp block 79 can be relatively stable, ensuring the position stability of the transmission shaft 6 during the detection process, which is helpful to improve the accuracy of the detection. In terms of the convenience and comprehensiveness of the detection operation, when the transmission shaft 6 needs to be replaced for detection, the clamping of the transmission shaft 6 by the first electric claw 4 and the second electric claw 5 can be released. At this time, the third driving motor 15 drives one side of the threaded rod 14 to rotate. Since the adjacent ends of the two threaded rods 14 are connected and the thread directions are opposite, the two moving blocks 2 can be driven to move relatively, so that the transmission shaft 6 automatically disengages between the first electric claw 4 and the second electric claw 5. Also, because the transmission shaft 6 is positioned and clamped by the coaxial positioning mechanism 7 on both sides, it will be picked up. Subsequently, the first driving motor 10 drives the cross frame 11 to rotate, driving the transmission shaft 6 clamped by the coaxial positioning mechanisms 7 on both sides to rotate and change direction, so that the other end of the transmission shaft 6 can be clamped by the first electric claw 4, and thus the transmission shaft 6 can be subjected to a position-changing dynamic balance detection at the dynamic balance detection device 3. This design not only helps to achieve the accuracy of the overall detection of the transmission shaft 6 by detecting both ends of the transmission shaft 6, but also greatly simplifies the direction-changing operation during the detection process and improves the detection efficiency.

[0042] As Figure 4 shown, a middle-section detection mechanism 16 is arranged on the cross frame 11.

[0043] As Figure 9 shown, the middle-section detection mechanism 16 includes a contact detection device 161. Two telescopic rods 162 are fixedly arranged on the lower surface of the contact detection device 161. The bottom ends of the two telescopic rods 162 are jointly fixedly provided with an adapter block 163. A spring 164 is arranged between the contact detection device 161 and the adapter block 163.

[0044] As Figure 9 shown, a bottom contact plate 165 is installed at the bottom of the connection block 163. A touch block 166 is arranged on the connection block 163. A contact detection part 167 corresponding to the touch block 166 is arranged on the lower surface of the contact detection device 161. When the bottom contact plate 165 is jacked up due to the movement with the contact surface, it will drive the touch block 166 to touch the contact detection part 167, so that the contact detection device 161 can detect the number of times of its contact.

[0045] As Figure 10 shown, a plurality of contact balls 168 are arranged on the bottom contact plate 165.

[0046] As Figure 6 and Figure 9 shown, a multi-stage electric push rod 17 and a support sliding rod 18 are fixedly installed on the cross frame 11. One end of the multi-stage electric push rod 17 is connected to the middle section detection mechanism 16. The top of the middle section detection mechanism 16 is slidably arranged on the support sliding rod 18. Driven by the multi-stage electric push rod 17, the middle section detection mechanism 16 can be driven to move horizontally. The bottom contact plate 165 is attached to the middle section surface of the transmission shaft 6 through the contact balls 168. The contact balls 168 can reduce the friction during contact and ensure the accuracy of detection. When the transmission shaft 6 generates a deviation during high-speed rotation, the bottom contact plate 165 will be lifted, and then the touch block 166 will be driven by the connection block 163 to move upward and touch the contact detection part 167. During this process, the spring 164 will perform adaptive rebound to play a buffering and stabilizing role. The number of times the contact detection part 167 is contacted will be recorded at the contact detection device 161, so as to realize the detection of the middle section of the transmission shaft 6. In addition, the telescopic movement of the multi-stage electric push rod 17 can drive the whole middle section detection mechanism 16 to perform horizontal displacement, and different positions of the middle section of the transmission shaft 6 can be detected, thereby reducing the detection influence caused by the universal joint on the mass distribution and moment of inertia of the transmission shaft. Coupled with the transposition detection at both ends of the transmission shaft 6, detection data can be obtained from multiple angles and positions, which helps to comprehensively and accurately evaluate the dynamic balance state of the transmission shaft 6, greatly improving the overall accuracy of the dynamic balance detection of the transmission shaft 6 and providing reliable technical support for ensuring the stable operation of the automotive transmission system.

[0047] The working principle and usage process of the present invention: When using the dynamic balance detection device for the automotive transmission shaft, first place the transmission shaft 6 between the first electric jaw 4 and the second electric jaw 5, and start the third drive motor 15. It drives the two threaded rods 14 to rotate. Since the thread directions of the two threaded rods 14 are opposite, the two moving blocks 2 will perform relative displacement under the guidance of the positioning sliding rod 13, so that the first electric jaw 4 and the second electric jaw 5 clamp the transmission shaft 6;

[0048] Next, start the dynamic balance detection device 3, which drives the entire transmission shaft 6 to rotate through the first electric gripper 4, and begins to preliminarily detect its dynamic balance performance. At the same time, to reduce the influence of the universal joint on the detection, start the second drive motor 713, which drives the worm 712 to rotate. The worm 712 drives the engaged worm gear 711 to rotate, and further causes the first bevel gear 72 to rotate. The first bevel gear 72 drives the third bevel gear 74 to rotate in the opposite direction through the meshing transmission with the second bevel gear 73 and the third bevel gear 74. The drive rod 75 and the drive sleeve 77 drive the first rotating rod 76 and the second rotating rod 78 to rotate respectively. Since the first rotating rod 76 and the second rotating rod 78 are in an X shape, the positioning clamp blocks 79 at both ends will clamp and position the two parts of the transmission shaft 6 with the universal joint as the grading line. The side rollers 710 on the positioning clamp blocks 79 can reduce the friction when the transmission shaft 6 rotates, ensuring its smooth rotation. Moreover, the self-locking property of the worm 712 and the worm gear 711 makes the positioning and clamping of the positioning clamp blocks 79 relatively stable, ensuring the position stability of the transmission shaft 6 during the detection process and improving the accuracy of the detection;

[0049] When detecting the middle section of the transmission shaft 6, the multi-stage electric push rod 17 drives the middle section detection mechanism 16 to move horizontally on the support slide rod 18, so that the bottom contact plate 165 fits on the surface of the middle section of the transmission shaft 6 through the contact rolling balls 168. When the transmission shaft 6 generates a deviation during high-speed rotation, the bottom contact plate 165 will be lifted, driving the touch block 166 to move upward through the connecting block 163 and touch the contact detection part 167. The spring 164 will perform an adaptive rebound to play a buffering role. The number of times the contact detection part 167 is contacted will be recorded at the contact detection device 161, realizing the detection of different positions of the middle section of the transmission shaft 6;

[0050] When it is necessary to detect the other end of the transmission shaft 6, the clamping of the first electric gripper 4 and the second electric gripper 5 can be released, and the third drive motor 15 can be started again to separate the two moving blocks 2, allowing the transmission shaft 6 to automatically disengage. Due to the positioning and clamping of the coaxial positioning mechanisms 7 on both sides, the first drive motor 10 can be started, which drives the cross frame 11 to rotate, causing the transmission shaft 6 to change the rotation direction, and then re-clamping through the first electric gripper 4 and the second electric gripper 5 for the dynamic balance detection after the position change;

[0051] In summary, the device greatly improves the overall accuracy of the dynamic balance detection through the comprehensive detection of both ends and the middle section of the transmission shaft 6, while facilitating the detection operation, providing a strong guarantee for the quality control of the automotive transmission shaft.

[0052] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automobile drive shaft dynamic balance detection device, comprising a detection table (1), characterized in that: The detection table (1) is provided with two moving blocks (2). On one side of the moving block (2), a dynamic balance detection device (3) is installed. The device uses a rotating first electric gripper (4) and a rotating second electric gripper (5) on the other side of the moving block (2) to jointly clamp the transmission shaft (6). Two coaxial positioning mechanisms (7) are arranged on the detection table (1). The mechanism includes a U-shaped connecting plate (71). In the U-shaped connecting plate (71), a first bevel gear (72), a second bevel gear (73), and a third bevel gear (74) are respectively rotatably arranged. The first bevel gear (72) and the third bevel gear (74) are respectively meshed with the second bevel gear (73). The bottom of the first bevel gear (72) is connected to a first rotating rod (76) through a driving rod (75). The inside of the third bevel gear (74) is rotatably arranged on the first rotating rod (76) through a driving sleeve (77), and the bottom end of the driving sleeve (77) is connected to a second rotating rod (78). The first rotating rod (76) and the second rotating rod (78) are distributed in an X shape, and positioning clamp blocks (79) are rotatably installed at their ends. A plurality of side rotating rollers (710) are rotatably arranged on each positioning clamp block (79). The side rotating rollers (710) can reduce the friction when the transmission shaft rotates during clamping. The rotation of the first rotating rod (76) and the second rotating rod (78) can drive the positioning clamp blocks (79) at both ends to clamp two parts of the transmission shaft (6) with the universal joint as the grading line, ensuring the horizontal transmission effect of the transmission shaft (6), improving the coaxiality of the universal joint during overall rotation, and reducing the influence on the middle section during the dynamic balance detection of the transmission shaft (6) rotation of the universal joint.

2. The dynamic balance detection device for an automotive drive shaft according to claim 1, wherein: A vertical frame (8) is fixedly installed on the detection table (1). A hydraulic rod (9) is fixedly installed on the vertical frame (8). The bottom end of the hydraulic rod (9) is connected to a first driving motor (10). The output shaft of the first driving motor (10) is connected to a cross frame (11). The two coaxial positioning mechanisms (7) are respectively fixedly installed on the cross frame (11) through the U-shaped connecting plates (71).

3. The dynamic balance detection device for an automotive drive shaft according to claim 2, wherein: A worm gear (711) is connected to the rotation point at the top of each first bevel gear (72) and the U-shaped connecting plate (71). Two worm shafts (712) are rotatably arranged on both sides of the cross frame (11). Each worm shaft (712) is respectively meshed with the corresponding side worm gear (711). Two second driving motors (713) respectively drivingly connected to the worm shafts (712) are also installed on the cross frame (11). When the second driving motor (713) is started, the rotation of the worm shaft (712) will drive the rotation of the worm gear (711).

4. The dynamic balance detection device for an automotive drive shaft according to claim 1, wherein: A moving groove (12) is formed in the detection table (1), a positioning slide bar (13) is fixedly arranged in the moving groove (12), two threaded rods (14) are rotatably arranged in the detection table (1), the adjacent ends of the two threaded rods (14) are connected, and the thread directions on the two threaded rods (14) are opposite. The inner parts of the two moving blocks (2) are respectively threadedly connected to the threaded rods (14) on the corresponding sides, and their inner parts are both slidably connected to the positioning slide bar (13).

5. The dynamic balance detection device for an automobile drive shaft according to claim 4, wherein: One end of the detection table (1) is provided with a third drive motor (15) which is drivingly connected to the end of one side of the threaded rod (14). Driven by the third drive motor (15), the two threaded rods (14) can be driven to rotate, and then the two moving blocks (2) can be driven to move relatively by the opposite threads on the two threaded rods (14).

6. The dynamic balance detection device for an automotive drive shaft according to claim 2, wherein: A middle-section detection mechanism (16) is arranged on the cross frame (11).

7. The dynamic balance detection device for an automotive drive shaft according to claim 6, wherein: The middle-section detection mechanism (16) includes a contact detection device (161). Two telescopic rods (162) are fixedly arranged on the lower surface of the contact detection device (161). The bottom ends of the two telescopic rods (162) are jointly fixedly provided with an adapter block (163). A spring (164) is arranged between the contact detection device (161) and the adapter block (163).

8. An automotive drive shaft dynamic balance detection device according to claim 7, characterized in that: A bottom contact plate (165) is installed at the bottom of the adapter block (163). A touch block (166) is arranged on the adapter block (163). A contact detection part (167) corresponding to the touch block (166) is arranged on the lower surface of the contact detection device (161). When the bottom contact plate (165) is jacked up due to movement with the contact surface, the touch block (166) can be driven to touch the contact detection part (167), and then the contact detection device (161) can detect the number of times of its contact.

9. The dynamic balance detection device for an automotive drive shaft according to claim 8, wherein: A plurality of contact balls (168) are arranged on the bottom contact plate (165).

10. A dynamic balance detection device for an automobile drive shaft according to claim 2, characterized in that: A multi-stage electric push rod (17) and a support slide bar (18) are fixedly installed on the cross frame (11). One end of the multi-stage electric push rod (17) is connected to the middle-section detection mechanism (16). The top of the middle-section detection mechanism (16) is slidably arranged on the support slide bar (18). Driven by the multi-stage electric push rod (17), the middle-section detection mechanism (16) can be driven to move horizontally.

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