Dynamic balance detection device for automobile transmission shaft

Abstract

The invention discloses an automobile transmission shaft dynamic balance detection device, and belongs to the technical field of transmission shaft detection, the automobile transmission shaft dynamic balance detection device comprises a detection table, the detection table is provided with two moving blocks, the moving block on one side is provided with dynamic balance detection equipment, and the equipment passes through a rotating first electric clamping jaw; according to the coaxial positioning mechanism, through transmission cooperation among a first bevel gear, a second bevel gear and a third bevel gear in the coaxial positioning mechanism, when the first bevel gear is driven, the second bevel gear can be driven to rotate, and then the third bevel gear and the first bevel gear rotate in the opposite directions; in the transmission process, the second rotating rod below the driving rod and the first rotating rod below the driving sleeve can rotate, and the rotation of the second rotating rod and the first rotating rod can drive the positioning clamping blocks at the two ends to clamp the two sections, with the universal joint as a grading line, on the transmission shaft, so that horizontal transmission of the transmission shaft is guaranteed, the coaxiality of the universal joint is improved, and interference to middle section detection is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of transmission shaft detection, and in particular relates to a dynamic balance detection device for an automobile transmission shaft. Background Art

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

[0003] At present, the dynamic balance test of the transmission shaft usually adopts the method of clamping at both ends, so that the transmission shaft is rotated and the vibration data is collected by the detection equipment to evaluate its balance state. However, when the transmission shaft is long and has 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 have brought obstacles to the dynamic balance detection of the middle section of the drive shaft. During the horizontal detection process, the active characteristics of the universal joint cause it to produce complex swings and displacements when the drive shaft rotates. This irregular movement may cause serious interference to the detection signal, and it is difficult for the detection equipment to capture the true vibration of the middle section. In addition, the existence of the universal joint will also change the mass distribution and moment of inertia of the drive shaft, making it impossible for traditional detection algorithms based on fixed structural models to accurately calculate the imbalance of the middle section.

[0005] In order to avoid the above technical problems, it is necessary to provide a vehicle transmission shaft dynamic balance detection device to overcome the above defects in the prior art. Summary of the invention

[0006] The purpose of the present invention is to provide a vehicle transmission shaft dynamic balance detection device to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solutions: a dynamic balance detection device for a vehicle transmission shaft, comprising a detection platform, wherein the detection platform is provided with two moving blocks, and a dynamic balance detection device is installed on one side of the moving block, and the device clamps the transmission shaft together with a rotating second electric clamp on the moving block on the other side through a rotating first electric clamp; Two coaxial positioning mechanisms are arranged on the detection platform, and the mechanisms include a U-shaped connecting plate, in which the first bevel gear, the second bevel gear and the third bevel gear are rotatably arranged respectively, 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 the first rotating rod through the driving rod, and the inside of the third bevel gear is rotatably arranged on the first rotating rod through the driving sleeve, and the bottom end of the driving sleeve is connected to the second rotating rod, the first rotating rod and the second rotating rod are distributed in an X shape, and the ends of the first rotating rods are rotatably installed with positioning clamps, and each of the positioning clamps is rotatably arranged with a plurality of side rotating rollers.

[0008] As a preferred embodiment, a vertical frame is fixedly installed on the detection table, a hydraulic rod is fixedly installed on the vertical frame, the bottom end of the hydraulic rod is connected to a first drive motor, the output shaft of the first drive motor is connected to a cross frame, and the two coaxial positioning mechanisms are fixedly installed on the cross frame through U-shaped connecting plates.

[0009] As a preferred embodiment, each of the first bevel gears and the rotating part of the top of the U-shaped connecting plate is connected to a worm wheel, and two worms are rotatably arranged on both sides of the cross frame, and each of the worms is respectively meshed with the worm wheel on the corresponding side. Two second drive motors respectively connected to the worm drive are also installed on the cross frame. When the second drive motor is started, the rotation of the worm will drive the rotation of the worm wheel.

[0010] As a preferred embodiment, a movable groove is provided on the detection platform, a positioning slide rod is fixedly arranged in the movable groove, two threaded rods are rotatably arranged in the detection platform, the proximal ends of the two threaded rods are connected, and the threads on the two threaded rods are in opposite directions, the interiors of the two movable blocks are respectively threadedly connected to the threaded rods on the corresponding sides, and their interiors are slidably connected to the positioning slide rod.

[0011] As a preferred embodiment, a third drive motor is installed at one end of the detection platform and is drivingly connected to the end of a threaded rod on one side. The third drive motor can drive the two threaded rods to rotate, and then drive the two moving blocks to relative displacement through the opposite threads on the two threaded rods.

[0012] As a preferred implementation scheme, a middle section detection mechanism is provided on the cross frame.

[0013] As a preferred embodiment, the middle section detection mechanism includes a contact detection device, and two telescopic rods are fixedly provided on the lower surface of the contact detection device, and a connecting block is fixedly provided at the bottom ends of the two telescopic rods, and a spring is provided between the contact detection device and the connecting block.

[0014] As a preferred embodiment, a bottom contact plate is installed at the bottom of the connecting block, a touch block is arranged on the connecting 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 lifted up due to the movement with the contact surface, the touch block will be driven to touch the contact detection part, thereby enabling the contact detection device to detect the number of contacts.

[0015] As a preferred embodiment, a plurality of contact rolling balls are arranged on the bottom contact plate.

[0016] As a preferred embodiment, a multi-stage electric push rod and a supporting 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 sliding portion of the middle section detection mechanism is set on the supporting slide rod, which can drive the middle section detection mechanism to move laterally under the drive of the multi-stage electric push rod.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention, through the transmission cooperation between 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 the third bevel gear and the first bevel gear rotate in the opposite direction. This transmission process can allow the second rotating rod under the driving rod and the first rotating rod under the driving sleeve to rotate, and their rotation can drive the positioning clamps at both ends to clamp the two sections of the transmission shaft with 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 interference with the middle section detection. In addition, the multiple side rollers rotatably arranged on each positioning clamp can reduce the friction when the transmission shaft rotates, so that the transmission shaft can rotate synchronously and smoothly when rotating, ensuring the accuracy of the detection data, improving the accuracy of the dynamic balance detection of the transmission shaft, and helping the stable operation of the mechanical equipment.

[0018] According to the present invention, when the second driving motor is started, the worm gear can be driven to rotate by the worm, thereby causing the first bevel gear to rotate, thereby realizing stable clamping and positioning of the transmission shaft. When the transmission shaft transposition detection is required, the clamping of the transmission shaft by the first electric clamp and the second electric clamp can be released, and the two moving blocks can be driven to be relatively displaced by the rotation of the threaded rod under the drive of the third driving motor, so that the transmission shaft is automatically disengaged, because the transmission shaft is picked up due to the clamping of the coaxial positioning mechanisms on both sides, and the transmission shaft clamped by the coaxial positioning mechanisms on both sides is driven by the first driving motor through the cross frame to rotate and reverse, thereby performing transposition dynamic balancing detection at the dynamic balancing detection equipment. This design not only helps to achieve the accuracy of its overall detection by detecting both ends of the transmission shaft, but also greatly simplifies the reversing operation during the detection process, thereby improving the detection efficiency.

[0019] In the present invention, the bottom contact plate is attached to the middle surface of the transmission shaft through a contact ball. The contact ball can reduce 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 up and touch the contact detection part through the connecting block. During this process, the number of times the contact detection part is touched will be recorded at the contact detection device, thereby realizing the detection of the middle section of the transmission shaft. In addition, the extension and retraction of the multi-stage electric push rod can drive the middle section detection mechanism to move horizontally as a whole, and can detect different positions of the middle section of the transmission shaft, thereby reducing the detection influence of the universal joint on the mass distribution and moment of inertia of the transmission shaft, etc., and combined with the transposition detection at both ends of the transmission shaft, the detection data can be obtained from multiple angles and positions, which is helpful to comprehensively and accurately evaluate the dynamic balance state of the transmission shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the front view three-dimensional structure of the present invention; Figure 3 It is a schematic diagram of a top view of a three-dimensional structure of the present invention; Figure 4 It is a schematic diagram of a local three-dimensional structure of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the transmission shaft of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the coaxial positioning mechanism of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the positioning clamp block of the present invention; Figure 8 is a schematic diagram of the three-dimensional structure of the first bevel gear of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the middle section detection mechanism of the present invention; Fig.10 It is a schematic diagram of the three-dimensional structure of the contact detection part of the present invention; Fig.11 It is a schematic diagram of the three-dimensional structure of the contact ball of the present invention.

[0021] In the figure: 1, test table; 2, moving block; 3, dynamic balance test equipment; 4, first electric clamp; 5, second electric clamp; 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 clamp; 710, side rotating roller; 711, worm gear; 712, worm; 713, second driving driving motor; 8. vertical frame; 9. hydraulic rod; 10. first driving motor; 11. horizontal frame; 12. moving groove; 13. positioning slide rod; 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 ball; 17. multi-stage electric push rod; 18. supporting slide rod. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the embodiments.

[0023] The following examples are used to illustrate the present invention, but they cannot be used to limit the scope of protection of the present invention. The conditions in the examples can be further adjusted according to specific conditions. Simple improvements to the method of the present invention under the premise of the concept of the present invention belong to the scope of protection claimed in the present invention.

[0024] See also Figure 1-11 The present invention provides a dynamic balance detection device for a vehicle transmission shaft, comprising a detection platform 1, wherein the detection platform 1 is provided with two moving blocks 2, and a dynamic balance detection device 3 is installed on one side of the moving block 2, and the device clamps a transmission shaft 6 together with a rotating second electric clamp 5 on the moving block 2 on the other side through a rotating first electric clamp 4;

[0025] Two coaxial positioning mechanisms 7 are provided on the testing platform 1, and the mechanism includes a U-shaped connecting plate 71, in which a first bevel gear 72, a second bevel gear 73 and a third bevel gear 74 are rotatably provided respectively, and the first bevel gear 72 and the third bevel gear 74 are respectively meshed with the second bevel gear 73, and the bottom of the first bevel gear 72 is connected to the first rotating rod 76 through a driving rod 75, and the interior of the third bevel gear 74 is rotatably provided on the first rotating rod 76 through a driving sleeve 77, and the bottom end of the driving sleeve 77 is connected to the second rotating rod 78, the first rotating rod 76 and the second rotating rod 78 are distributed in an X shape, and positioning clamps 79 are rotatably installed at their ends, and a plurality of side rotating rollers 710 are rotatably provided on each positioning clamp 79, and 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, the second bevel gear 73 can be driven to rotate, thereby making the third bevel gear 74 and the first bevel gear 76 rotate. The wheels 72 rotate in opposite directions. This transmission process allows the second rotating rod 78 under the driving rod 75 and the first rotating rod 76 under the driving sleeve 77 to rotate. Since the first rotating rod 76 and the second rotating rod 78 are X-shaped, their rotation can drive the positioning clamps 79 at both ends to clamp the two sections of the transmission shaft 6 with 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 of the universal joint on the middle section when the transmission shaft 6 rotates for dynamic balancing detection can be effectively reduced. In addition, the multiple side rotating rollers 710 rotatably arranged on each positioning clamp 79 can reduce the friction when the transmission shaft 6 rotates, so that the transmission shaft 6 can rotate synchronously and smoothly when rotating, ensuring that the dynamic balancing detection equipment 3 drives the transmission shaft 6 to rotate through the first electric clamp 4. The data obtained is more accurate and reliable, thereby improving the accuracy and effectiveness of the dynamic balancing performance detection of the transmission shaft 6, providing strong support for ensuring the stable operation of mechanical equipment.

[0026] like Figure 2 and Figure 5 As shown, a vertical frame 8 is fixedly mounted on the testing platform 1, a hydraulic rod 9 is fixedly mounted on the vertical frame 8, a first driving motor 10 is connected to the bottom end of the hydraulic rod 9, an output shaft of the first driving motor 10 is connected to a cross frame 11, and two coaxial positioning mechanisms 7 are fixedly mounted on the cross frame 11 via U-shaped connecting plates 71 respectively.

[0027] like Figures 6 to 8 As shown, each first bevel gear 72 is connected to a worm wheel 711 at the rotating point on the top of the U-shaped connecting plate 71, and two worms 712 are rotatably arranged on both sides of the cross frame 11. Each worm 712 is respectively meshed with the worm wheel 711 on the corresponding side. Two second drive motors 713 respectively connected to the worm 712 are installed on the cross frame 11. When the second drive motor 713 is started, the rotation of the worm 712 drives the rotation of the worm wheel 711.

[0028] like Figure 3 and Figure 4 As shown, a moving groove 12 is opened on the detection platform 1, and a positioning slide rod 13 is fixedly arranged in the moving groove 12. Two threaded rods 14 are rotatably arranged in the detection platform 1. The proximal ends of the two threaded rods 14 are connected, and the threads on the two threaded rods 14 are in opposite directions. The interiors of the two moving blocks 2 are respectively threadedly connected to the threaded rods 14 on the corresponding sides, and their interiors are slidably connected to the positioning slide rod 13.

[0029] like Figure 3 and Figure 4 As shown, a third drive motor 15 drivingly connected to the end of a threaded rod 14 on one side is installed at one end of the detection platform 1. The third drive motor 15 can drive the two threaded rods 14 to rotate, and then drive the two moving blocks 2 to relative displacement through the opposite threads on the two threaded rods 14. When the second drive motor 713 is started, the worm gear 711 can be driven to rotate through the worm 712, thereby rotating the first bevel gear 72 to achieve 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 gear 711, the positioning clamping block 79 can be relatively stable, ensuring the stable position of the transmission shaft 6 during the detection process, which helps 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 transposed, the first electric clamp 4 and the second electric clamp 5 can be released from the transmission. The third drive motor 15 drives the threaded rod 14 on one side to rotate. Since the two threaded rods 14 are connected at adjacent ends and have opposite thread directions, the two movable blocks 2 can be driven to move relative to each other, so that the transmission shaft 6 automatically disengages from between the first electric clamp 4 and the second electric clamp 5. Since 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 drive motor 10 drives the cross frame 11 to rotate, driving the transmission shaft 6 clamped by the coaxial positioning mechanism 7 on both sides to rotate and reverse, so that the other end of the transmission shaft 6 can be clamped by the first electric clamp 4, thereby performing a transposition dynamic balancing test at the dynamic balancing test device 3. This design not only helps to achieve the accuracy of the overall detection by detecting both ends of the transmission shaft 6, but also greatly simplifies the reversing operation during the detection process, thereby improving the detection efficiency.

[0030] like Figure 4 As shown, a middle section detection mechanism 16 is provided on the cross frame 11 .

[0031] like Fig. 9 As shown, the middle section detection mechanism 16 includes a contact detection device 161, and two telescopic rods 162 are fixedly provided on the lower surface of the contact detection device 161. A connecting block 163 is fixedly provided at the bottom ends of the two telescopic rods 162, and a spring 164 is provided between the contact detection device 161 and the connecting block 163.

[0032] like Fig. 9 As shown, a bottom contact plate 165 is installed at the bottom of the connecting block 163, a touch block 166 is arranged on the connecting block 163, and 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 lifted up due to the movement with the contact surface, the touch block 166 will be driven to touch the contact detection part 167, so that the contact detection device 161 can detect the number of contacts.

[0033] like Fig.10 As shown, a plurality of contact rolling balls 168 are disposed on the bottom contact plate 165 .

[0034] like Figure 6 and Fig. 9 As shown, a multi-stage electric push rod 17 and a supporting 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, and the top of the middle section detection mechanism 16 is slidably arranged on the supporting slide bar 18. Under the drive of the multi-stage electric push rod 17, the middle section detection mechanism 16 can be driven to move horizontally, and the bottom contact plate 165 is attached to the middle section surface of the transmission shaft 6 through the contact ball 168. The contact ball 168 can reduce the friction during contact and ensure the accuracy of detection. When the transmission shaft 6 deviates during high-speed rotation, the bottom contact plate 165 will be lifted, and then the touch block 166 will be driven to move up through the connecting block 163 and touch the contact detection part 167. In this process, the spring 164 will be adaptive. The data of the number of times the contact detection part 167 is touched 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 extension and retraction of the multi-stage electric push rod 17 can drive the middle section detection mechanism 16 to move laterally as a whole, so as to detect different positions of the middle section of the transmission shaft 6, thereby reducing the detection influence of the universal joint on the mass distribution and moment of inertia of the transmission shaft, etc., and combining with the transposition detection at both ends of the transmission shaft 6, the detection data can be obtained from multiple angles and positions, which is helpful 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 automobile transmission system.

[0035] The working principle and use process of the present invention are as follows: when using the automobile transmission shaft dynamic balance detection device, firstly, the transmission shaft 6 is placed between the first electric clamp 4 and the second electric clamp 5, and the third drive motor 15 is started, which 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 be relatively displaced under the guidance of the positioning slide bar 13, so that the first electric clamp 4 and the second electric clamp 5 clamp the transmission shaft 6; Then, the dynamic balancing detection device 3 is started, which drives the entire transmission shaft 6 to rotate through the first electric clamp 4, and begins to perform a preliminary detection of its dynamic balancing performance. At the same time, in order to reduce the influence of the universal joint on the detection, the second drive motor 713 is started, which drives the worm 712 to rotate, and the worm 712 drives the worm wheel 711 meshing with it to rotate, thereby rotating the first bevel gear 72, and the first bevel gear 72 is meshed with the second bevel gear 73 and the third bevel gear 74 to rotate the third bevel gear 74 in the opposite direction, and the driving rod 75 and the driving sleeve 77 respectively drive the first rotating rod 76 and the second rotating rod 78 to rotate. Since the first rotating rod 76 and the second rotating rod 78 are X-shaped, the positioning clamps 79 at both ends will clamp and position the two sections of the transmission shaft 6 with the universal joint as the grading line, and the side rollers 710 on the positioning clamps 79 can reduce the friction when the transmission shaft 6 rotates, ensuring its smooth rotation, and the self-locking property of the worm 712 and the worm wheel 711 makes the positioning clamping of the positioning clamp 79 more stable, ensuring the stable position of the transmission shaft 6 during the detection process, and improving the accuracy of the detection; 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 bar 18, so that the bottom contact plate 165 is attached to the surface of the middle section of the transmission shaft 6 through the contact ball 168. When the transmission shaft 6 deviates during high-speed rotation, the bottom contact plate 165 will be lifted, and the contact block 166 will be driven to move up and touch the contact detection part 167 through the connecting block 163. The spring 164 will rebound adaptively to play a buffering role. The number of times the contact detection part 167 is touched will be recorded at the contact detection device 161, so as to realize the detection of different positions of the middle section of the transmission shaft 6. When the other end of the transmission shaft 6 needs to be inspected, the clamping of the first electric clamp 4 and the second electric clamp 5 can be released, and the third drive motor 15 can be started again to separate the two moving blocks 2, so that the transmission shaft 6 can be automatically disengaged. 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, so that the transmission shaft 6 rotates and reverses, and then it is clamped by the first electric clamp 4 and the second electric clamp 5 again, and the dynamic balance detection after the transposition is carried out; In summary, the device greatly improves the overall accuracy of dynamic balancing detection by comprehensively detecting both ends and the middle section of the transmission shaft 6, while facilitating the detection operation and providing a strong guarantee for the quality control of the automobile transmission shaft.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vehicle transmission shaft dynamic balance detection device, comprising a detection platform (1), characterized in that: The detection platform (1) is provided with two moving blocks (2), and a dynamic balancing detection device (3) is installed on one side of the moving block (2). The device clamps a transmission shaft (6) together with a rotating second electric clamp (5) on the moving block (2) on the other side through a rotating first electric clamp (4); Two coaxial positioning mechanisms (7) are arranged on the detection platform (1), the mechanisms comprising a U-shaped connecting plate (71), a first bevel gear (72), a second bevel gear (73) and a third bevel gear (74) are rotatably arranged in the U-shaped connecting plate (71), 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 the first rotating rod (76) via a driving rod (75), and the inside of the third bevel gear (74) is rotatably arranged on the first rotating rod (76) via a driving sleeve (77), and the bottom end of the driving sleeve (77) is connected to the second rotating rod (78); The first rotating rod (76) and the second rotating rod (78) are arranged in an X shape, and positioning clamps (79) are rotatably mounted on their ends. A plurality of side rotating rollers (710) are rotatably mounted on each of the positioning clamps (79). When the side rotating rollers (710) clamp the transmission shaft (6), they can reduce friction when the transmission shaft rotates.

2. The vehicle transmission shaft dynamic balance detection device according to claim 1, characterized in that: A vertical frame (8) is fixedly mounted on the detection platform (1), a hydraulic rod (9) is fixedly mounted on the vertical frame (8), a first drive motor (10) is connected to the bottom end of the hydraulic rod (9), an output shaft of the first drive motor (10) is connected to a horizontal frame (11), and the two coaxial positioning mechanisms (7) are fixedly mounted on the horizontal frame (11) via U-shaped connecting plates (71), respectively.

3. The vehicle transmission shaft dynamic balance detection device according to claim 2, characterized in that: A worm wheel (711) is connected to the rotation point of each of the first bevel gears (72) and the top of the U-shaped connecting plate (71); two worms (712) are rotatably provided on both sides of the cross frame (11); each of the worms (712) is respectively meshed with the worm wheel (711) on the corresponding side; and two second drive motors (713) are also installed on the cross frame (11) and are respectively connected to the worms (712); when the second drive motors (713) are started, the rotation of the worms (712) drives the rotation of the worm wheel (711).

4. The vehicle transmission shaft dynamic balance detection device according to claim 1, characterized in that: The detection platform (1) is provided with a moving groove (12), a positioning slide rod (13) is fixedly arranged in the moving groove (12), two threaded rods (14) are rotatably arranged in the detection platform (1), the proximal ends of the two threaded rods (14) are connected, and the threads on the two threaded rods (14) are in opposite directions, the interiors of the two moving blocks (2) are respectively threadedly connected to the threaded rods (14) on the corresponding sides, and the interiors thereof are both slidably connected to the positioning slide rod (13).

5. The vehicle transmission shaft dynamic balance detection device according to claim 4, characterized in that: A third drive motor (15) is mounted at one end of the detection platform (1) and is drivably connected to the end of the threaded rod (14) on one side. The third drive motor (15) can drive the two threaded rods (14) to rotate, thereby driving the two moving blocks (2) to move relative to each other through the opposite threads on the two threaded rods (14).

6. The vehicle transmission shaft dynamic balance detection device according to claim 2, characterized in that: A middle section detection mechanism (16) is provided on the cross frame (11).

7. The vehicle transmission shaft dynamic balance detection device according to claim 6, characterized in that: The middle section detection mechanism (16) comprises a contact detection device (161), two telescopic rods (162) are fixedly provided on the lower surface of the contact detection device (161), a connecting block (163) is fixedly provided at the bottom ends of the two telescopic rods (162), and a spring (164) is provided between the contact detection device (161) and the connecting block (163).

8. The automobile transmission shaft dynamic balance detection device according to claim 7, characterized in that: 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), and a contact detection portion (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 lifted up due to movement with the contact surface, it drives the touch block (166) to touch the contact detection portion (167), thereby enabling the contact detection device (161) to detect the number of contacts.

9. The automobile transmission shaft dynamic balance detection device according to claim 8, characterized in that: A plurality of contact rolling balls (168) are arranged on the bottom contact plate (165).

10. The vehicle transmission shaft dynamic balance detection device according to claim 2, characterized in that: A multi-stage electric push rod (17) and a supporting slide rod (18) are fixedly mounted 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 supporting slide rod (18); and the middle section detection mechanism (16) can be driven to move horizontally under the drive of the multi-stage electric push rod (17).

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