A lightweight drive shaft detection device

Abstract

The present invention discloses a lightweight drive shaft detection device, belonging to the technical field of drive shaft detection, which includes a detection table. A first support block and a second support block are respectively installed on the detection table. A sliding groove is formed in the first support block, and a sliding block is slidably connected in the sliding groove. In the present invention, by controlling the device to adjust the current of the annular magnetorheological fluid cavity, the state of the magnetorheological fluid is changed, and the support stiffness and damping ratio of the lightweight drive shaft are dynamically adjusted. When simulating a bumpy road condition, the stiffness and damping are moderately or greatly increased according to the degree of bumpiness, and different vibration shocks are accurately simulated. The increased stiffness and damping can not only fix the drive shaft through the expansion of the flexible diaphragm, but also accelerate the accumulation of its fatigue damage. By gradually increasing the stiffness and damping for detection, the performance of the drive shaft under different fatigue accumulation speeds can be observed, providing a basis for evaluating its life and reliability, and meeting the high-efficiency detection requirements of modern manufacturing.

Description

Technical Field

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

[0002] In the development process of the automotive industry, the complexity of vehicle driving conditions poses strict requirements on the performance of drive shafts. As a key component of the vehicle transmission system, the drive shaft needs to transmit power stably and reliably under complex road conditions.

[0003] Traditional drive shaft detection devices often use rigid connection methods such as steel pipes to fix and support the drive shaft. However, this rigid connection has many limitations. During actual vehicle driving, road conditions are complex and variable, and there are various degrees of differences in bumpy road conditions. Due to the fixed stiffness and damping of the steel pipe, it cannot simulate the vibration shock changes brought about by different degrees of bumps. For example, under slightly bumpy road conditions, the vehicle drive shaft will be subjected to small and low-frequency vibration shocks; while under severely bumpy road conditions, the vibration shocks are stronger and have a higher frequency. The traditional steel pipe connection method cannot accurately simulate these different degrees of vibration shocks, making it difficult for the detection results to truly reflect the performance of the drive shaft under actual complex road conditions.

[0004] In terms of adaptability, traditional detection devices also have defects. Lightweight drive shafts used in different automobiles or aerospace products have significant differences in size, structure, and material properties. However, traditional detection devices are usually designed for specific types or size ranges of drive shafts and lack an effective adaptive adjustment mechanism. When faced with drive shafts of different sizes, complex readjustments or even component replacements of the detection device are required, which not only increases the detection cost and time but also reduces the detection efficiency and is difficult to meet the requirements of modern manufacturing for rapid and efficient detection.

[0005] In addition, in evaluating the fatigue and reliability of drive shafts, traditional detection methods also have deficiencies. Different degrees of changes in support stiffness and damping will cause the drive shaft to bear different stresses and strains, thereby affecting its fatigue accumulation and reliability. However, due to the lack of a flexible and variable support stiffness and damping adjustment mechanism in traditional detection devices, it is difficult to comprehensively and effectively detect the performance of drive shafts under different fatigue accumulation speeds and cannot provide sufficient and accurate basis for engineers to improve drive shaft designs and enhance their durability.

[0006] To avoid the above technical problems, it is indeed necessary to provide a lightweight drive shaft detection device to overcome the defects in the prior art. Summary of the Invention

[0007] The purpose of the present invention is to provide a lightweight drive shaft detection device to solve the problems raised in the above background art.

[0008] To achieve the above object, the present invention provides the following technical solution: A lightweight drive shaft detection device, including a detection table, on which a first support block and a second support block are respectively installed. A sliding groove is formed in the first support block, and a sliding block is slidably connected in the sliding groove. An electric push rod is installed on the first support block;

[0009] Annular magnetorheological fluid cavities are rotatably arranged in both the sliding block and the second support block. The electromagnetic parts on the two annular magnetorheological fluid cavities are connected to a first electric slip ring assembly. The two first electric slip ring assemblies are respectively installed on one side of the sliding block and the second support block through a fixing frame. A lightweight drive shaft is installed between the two annular magnetorheological fluid cavities. A flexible diaphragm is arranged at the contact part between the annular magnetorheological fluid cavity and the lightweight drive shaft. A control device is fixedly installed on one side of the second support block. The two first electric slip ring assemblies are connected to the control device.

[0010] As a preferred implementation, a synchronous drive mechanism is arranged on one side of the second support block.

[0011] As a preferred implementation, the synchronous drive mechanism includes a toothed ring installed on one side of the annular magnetorheological fluid cavity located on the second support block. A first gear is rotatably arranged on one side of the sliding block. The first gear meshes with the toothed ring. A second gear is fixedly installed on one side of the first gear. The tooth diameters of both the second gear and the toothed ring are smaller than that of the first gear. A rack is fixedly installed on one side of the second support block through a side frame. The second gear meshes with the rack. When the sliding block is driven to expand and contract, it will drive the lightweight drive shaft clamped by the magnetic flow in the annular magnetorheological fluid cavity to rotate synchronously through the transmission between the toothed ring and the rack.

[0012] As a preferred implementation, a plurality of flexible pressure detection sheets are installed on the flexible diaphragm on the inner surface of each annular magnetorheological fluid cavity. The plurality of flexible pressure detection sheets are generally annular. The plurality of flexible pressure detection sheets are jointly connected to a second electric slip ring assembly through an electricity connection part.

[0013] As a preferred implementation, the second electric slip ring assembly is connected to the control device. Each second electric slip ring assembly is respectively fixedly installed on the corresponding fixing frame. The pressure detection data of the plurality of flexible pressure detection sheets will be uniformly transmitted to the control device, and the data will be analyzed by the control device.

[0014] As a preferred implementation, a pressing and adjusting mechanism is arranged on one side of each of the two annular magnetorheological fluid cavities.

[0015] As a preferred embodiment, the pressing adjustment mechanism includes an elastic telescopic cylinder and a movable rod that can telescopically extend at one end of the elastic telescopic cylinder. A spring is arranged inside the elastic telescopic cylinder. One end of the movable rod is fixedly provided with a movable block that slides inside the elastic telescopic cylinder, and one side of the spring abuts against one side of the movable block.

[0016] As a preferred embodiment, a pressure detection block is fixedly provided at the other end of the movable rod. A pressing block is rotatably arranged on one side of the pressure detection block. One side of each pressing block abuts against one end of the installed lightweight transmission shaft, and cooperates with the expansion clamping of the flexible diaphragm in the annular magnetorheological fluid cavity, so that the lightweight transmission shaft can be stably installed.

[0017] As a preferred embodiment, a threaded adjustment rod penetrates and is threadedly connected to one side of each elastic telescopic cylinder. One end of the threaded adjustment rod is rotatably provided with an adjustment block that slides inside the elastic telescopic cylinder, and the other end of the spring abuts against one side of the adjustment block.

[0018] As a preferred embodiment, a turning handle is fixedly provided at the outer end of the threaded adjustment rod. The outside of the elastic telescopic cylinder is fixedly connected to one side of the sliding block through a connecting arm.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] In the present invention, by controlling the device to adjust the current of the annular magnetorheological fluid cavity, changing the state of the magnetorheological fluid, and dynamically adjusting the support stiffness and damping ratio of the lightweight transmission shaft. When simulating bumpy road conditions, according to the degree of bumpiness, the stiffness and damping are moderately or greatly increased, accurately simulating different vibration impacts. The increased stiffness and damping can not only fix the transmission shaft through the expansion of the flexible diaphragm, but also accelerate the accumulation of its fatigue damage. By gradually increasing the stiffness and damping for detection, the performance of the transmission shaft under different fatigue accumulation speeds can be observed, providing a basis for evaluating its life and reliability, and meeting the high-efficiency detection requirements of modern manufacturing.

[0021] In the synchronous drive mechanism of the present invention, the gear ring, the first gear, the second gear and the rack cooperate with each other. When the electric push rod drives the sliding block to expand and contract, the lightweight transmission shaft in the annular magnetorheological fluid cavity can be driven to rotate synchronously, and the sliding block moves on the first support block, enabling the lightweight transmission shaft to change the transmission angle while rotating, simulating different road conditions;

[0022] In addition, when the lightweight transmission shaft is clamped and fixed, multiple flexible pressure detection pieces installed on the inner surface flexible diaphragm of the annular magnetorheological fluid cavity will fit onto its surface. During the process of the transmission shaft changing its angle, problems such as local wear, abnormal assembly clearance, and force imbalance of the transmission shaft can be judged by detecting the pressure change values at different angles during the detection process. The detection data is transmitted to the control device through the second electric slip ring assembly for analysis, providing accurate basis for evaluating the performance and reliability of the lightweight transmission shaft and meeting the high-efficiency detection requirements of modern manufacturing.

[0023] When installing the lightweight transmission shaft of the present invention, one end of it abuts against one side of the pressing block, cooperating with the expansion clamping of the flexible diaphragm in the annular magnetorheological fluid cavity to ensure the stable installation of the transmission shaft. Rotating the turning handle can drive the adjusting block at one end of the threaded adjusting rod to move in a threaded manner within the elastic telescopic cylinder, squeezing the spring. Its resilience is transmitted to the pressing block through the movable block and the movable rod, making it press tighter. Moreover, when the annular magnetorheological fluid cavity and the lightweight transmission shaft rotate, the pressing block can rotate synchronously. At the same time, the movement of the adjusting block can change the position of the spring within the elastic telescopic cylinder, thereby adjusting the pressing position of the pressing block to adapt to the clamping requirements of lightweight transmission shafts of different lengths.

[0024] The pressure detection block of the present invention can detect the pressing pressure at the end of the lightweight transmission shaft during rotation and during detection at different transmission angles, simulate the end pressure situation generated due to the change of the transmission angle during use, and combine the detection data of the annular magnetorheological fluid cavity and the flexible pressure detection pieces to achieve comprehensive and efficient detection of the lightweight transmission shaft, providing a comprehensive and accurate basis and solution for evaluating its performance and reliability. Brief Description of the Drawings

[0025] Figure 1 is a schematic diagram of the three-dimensional structure of the present invention;

[0026] Figure 2 is a schematic diagram of the three-dimensional structure of the control device of the present invention;

[0027] Figure 3 is a schematic diagram of the three-dimensional structure of the first support block of the present invention;

[0028] Figure 4 is a schematic diagram of the three-dimensional structure of the lightweight transmission shaft of the present invention;

[0029] Figure 5 is a schematic diagram of the three-dimensional structure of the sliding block of the present invention;

[0030] Figure 6 is a schematic diagram of the three-dimensional structure of the fixing frame of the present invention;

[0031] Figure 7 is a schematic diagram of the three-dimensional structure of the annular magnetorheological fluid cavity of the present invention;

[0032] Figure 8 Schematic diagram of the three-dimensional structure of the gear ring of the present invention;

[0033] Figure 9 Schematic diagram of the sectional three-dimensional structure of the annular magnetorheological fluid cavity of the present invention;

[0034] Figure 10 Schematic diagram of the three-dimensional structure of the pressing adjustment mechanism of the present invention;

[0035] Figure 11 Schematic diagram of the sectional three-dimensional structure of the elastic telescopic cylinder of the present invention.

[0036] In the figure: 1, detection table; 2, first support block; 3, second support block; 4, sliding groove; 5, sliding block; 6, electric push rod; 7, annular magnetorheological fluid cavity; 8, electromagnetic part; 9, first electric slip ring assembly; 10, fixing frame; 11, lightweight transmission shaft; 12, flexible diaphragm; 13, control device; 14, synchronous drive mechanism; 141, gear ring; 142, first gear; 143, second gear; 144, side frame; 145, rack; 15, flexible pressure detection sheet; 16, power connection part; 17, second electric slip ring assembly; 18, pressing adjustment mechanism; 181, elastic telescopic cylinder; 182, movable rod; 183, spring; 184, movable block; 185, pressure detection block; 186, pressing block; 187, threaded adjustment rod; 188, adjustment block; 189, turning handle; 1810, connecting arm. Detailed implementation manners

[0037] The following further describes the present invention with reference to embodiments.

[0038] 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, and simple improvements to the method of the present invention under the premise of the concept of the present invention all belong to the scope required to be protected by the present invention.

[0039] Please refer to Figures 1-11 , the present invention provides a lightweight transmission shaft detection device, including a detection table 1, on which a first support block 2 and a second support block 3 are respectively installed. A sliding groove 4 is opened in the first support block 2, and a sliding block 5 is slidably connected in the sliding groove 4. An electric push rod 6 is installed on the first support block 2, and the bottom end of the electric push rod 6 is connected to the sliding block 5. Driven by the electric push rod 6, the sliding block 5 will slide up and down in the sliding groove 4;

[0040] A ring-shaped magnetorheological fluid cavity 7 is rotatably arranged in both the sliding block 5 and the second support block 3. The electromagnetic parts 8 on the two ring-shaped magnetorheological fluid cavities 7 are connected to a first electric slip ring assembly 9. Both first electric slip ring assemblies 9 are respectively installed on one side of the sliding block 5 and the second support block 3 through a fixing frame 10. A lightweight transmission shaft 11 is installed between the two ring-shaped magnetorheological fluid cavities 7. A flexible diaphragm 12 is arranged at the contact part between the ring-shaped magnetorheological fluid cavity 7 and the lightweight transmission shaft 11. A control device 13 is fixedly installed on one side of the second support block 3. The two first electric slip ring assemblies 9 are connected to the control device 13. The control device 13 controls the electromagnetic parts 8 on the ring-shaped magnetorheological fluid cavity 7 through the first electric slip ring assembly 9. By adjusting the current intensity to change the magnetic field, the magnetorheological fluid changes from a liquid state to a semi-solid state, and its internal stress and volume will change. Due to the limited cavity space, the tiny change in the volume of the magnetorheological fluid will be transmitted to the flexible diaphragm 12 through the internal pressure, prompting the flexible diaphragm 12 to expand outwards. The expansion of the flexible diaphragm 12 enables it to fit more tightly on the lightweight transmission shaft 11, so that both ends of the lightweight transmission shaft 11 can be fixed, and the support stiffness and damping ratio for it are dynamically adjusted. Through the first support block 2 and the second support block 3 on the test bench 1, in cooperation with the internal sliding groove 4, the sliding block 5 and the electric push rod 6, flexible adjustment of the structure is achieved. The ring-shaped magnetorheological fluid cavity 7, in cooperation with the first electric slip ring assembly 9, the flexible diaphragm 12 and the control device 13, can, according to actual needs, change the magnetic field by adjusting the current intensity, change the state of the magnetorheological fluid, and then dynamically adjust the support stiffness and damping ratio for the lightweight transmission shaft 11. On the one hand, during the simulation of mild bumps, the stiffness and damping are moderately increased, so that the lightweight transmission shaft 11 is subjected to smaller and lower-frequency vibration shocks; during the simulation of severe bumps, the stiffness and damping are greatly increased, so that the lightweight transmission shaft 11 is subjected to strong and higher-frequency vibration shocks. On the other hand, the increased support stiffness and damping, in addition to achieving convenient clamping and fixing installation of the lightweight transmission shaft 11 through the expansion of the flexible diaphragm 12, will also cause the transmission shaft to bear greater stress under vibration shocks and accumulate fatigue damage more quickly. By gradually increasing the degree of support stiffness and damping for detection, the performance of the transmission shaft under different fatigue accumulation speeds can be effectively observed, providing a basis for evaluating its fatigue life and reliability, meeting the requirements of rapid and efficient detection in modern manufacturing.

[0041] As Figure 1 shown, a synchronous drive mechanism 14 is arranged on one side of the second support block 3.

[0042] As Figure 4 and Figure 5As shown in the figure, the synchronous drive mechanism 14 includes a toothed ring 141 installed on one side of the annular magnetorheological fluid cavity 7 located on the second support block 3. A first gear 142 is rotatably provided on one side of the sliding block 5. The first gear 142 meshes with the toothed ring 141. A second gear 143 is fixedly installed on one side of the first gear 142. The tooth diameters of both the second gear 143 and the toothed ring 141 are smaller than that of the first gear 142. A rack 145 is fixedly installed on one side of the second support block 3 through a side frame 144. The second gear 143 meshes with the rack 145. When the sliding block 5 is driven to expand and contract, the lightweight transmission shaft 11 clamped by the magnetic flux in the annular magnetorheological fluid cavity 7 will be driven to rotate synchronously through the transmission between the toothed ring 141 and the rack 145.

[0043] As Figures 6 to 9 shown, a plurality of flexible pressure detection sheets 15 are installed on the flexible diaphragm 12 on the inner surface of each annular magnetorheological fluid cavity 7. The plurality of flexible pressure detection sheets 15 are generally annular. The plurality of flexible pressure detection sheets 15 are commonly connected to a second electric slip ring assembly 17 through an electricity connection part 16.

[0044] As Figures 6 to 9 shown, the second electric slip ring assembly 17 is connected to the control device 13. Each second electric slip ring assembly 17 is fixedly installed on the corresponding fixed frame 10. The pressure detection data of the plurality of flexible pressure detection sheets 15 will be uniformly transmitted to the control device 13, and the data will be analyzed by the control device 13. In the synchronous drive mechanism 14, the toothed ring 141, the first gear 142, the second gear 143 and the rack 145 cooperate with each other. When the electric push rod 6 drives the sliding block 5 to expand and contract, the lightweight transmission shaft 11 in the annular magnetorheological fluid cavity 7 can be driven to rotate synchronously. Moreover, when the sliding block 5 moves on the first support block 2, the lightweight transmission shaft 11 can change the transmission angle while rotating, simulating different road conditions. In addition, when the lightweight transmission shaft 11 is clamped and fixed, the plurality of flexible pressure detection sheets 15 installed on the flexible diaphragm 12 on the inner surface of the annular magnetorheological fluid cavity 7 will fit its surface. During the process of the change of the transmission shaft angle, the pressure change values at different angles during the detection process can be used to judge whether there are problems such as local wear, abnormal assembly clearance, and force imbalance of the transmission shaft. The detection data is transmitted to the control device 13 through the second electric slip ring assembly 17 for analysis, providing accurate basis for evaluating the performance and reliability of the lightweight transmission shaft 11 and meeting the high-efficiency detection requirements of modern manufacturing.

[0045] As Figure 1 shown, a pressing and adjusting mechanism 18 is provided on one side of each of the two annular magnetorheological fluid cavities 7.

[0046] As Figure 10 and Figure 11As shown in the figure, the pressing adjustment mechanism 18 includes an elastic telescopic cylinder 181 and a movable rod 182 that can telescopically extend at one end of the elastic telescopic cylinder 181. A spring 183 is arranged inside the elastic telescopic cylinder 181. One end of the movable rod 182 is fixedly provided with a movable block 184 that slides inside the elastic telescopic cylinder 181, and one side of the spring 183 abuts against one side of the movable block 184.

[0047] As Figures 4 to 11 shown in the figure, the other end of the movable rod 182 is fixedly provided with a pressure detection block 185. One side of the pressure detection block 185 is rotatably provided with a pressing block 186. One side of the pressing block 186 abuts against one end of the installed lightweight transmission shaft 11, and cooperates with the expansion clamping of the flexible diaphragm 12 in the annular magnetorheological fluid cavity 7, so that the lightweight transmission shaft 11 can be stably installed.

[0048] As Figure 11 shown in the figure, one side of each elastic telescopic cylinder 181 is threadedly connected through a threaded adjustment rod 187. One end of the threaded adjustment rod 187 is rotatably provided with an adjustment block 188 that slides inside the elastic telescopic cylinder 181. The other end of the spring 183 abuts against one side of the adjustment block 188.

[0049] As Figure 5 shown in the figure, the outer end of the threaded adjustment rod 187 is fixedly provided with a turning handle 189. The outside of the elastic telescopic cylinder 181 is fixedly connected to one side of the sliding block 5 through a connecting arm 1810.

[0050] The working principle and usage process of the present invention: First, place the lightweight transmission shaft 11 between two annular magnetorheological fluid cavities 7. Adjust the first electric slip ring assembly 9 through the control device 13 to change the current intensity of the electromagnetic part 8 in the annular magnetorheological fluid cavity 7, so that the state of the magnetorheological fluid changes, the flexible diaphragm 12 expands and clamps the lightweight transmission shaft 11, and dynamically adjusts the support stiffness and damping ratio. Rotate the turning handle 189 to adjust the pressure of the spring 183 through the threaded adjustment rod 187, so that the pressing block 186 tightly abuts against the lightweight transmission shaft 11 to adapt to the clamping of transmission shafts of different lengths;

[0051] During the detection process, first start the electric push rod 6. Its driving force causes the sliding block 5 to slide up and down in the sliding groove 4 of the first support block 2. This sliding action triggers the operation of the synchronous drive mechanism 14. Specifically, the movement of the sliding block 5 drives the first gear 142 thereon. The first gear 142 meshes with the toothed ring 141. At the same time, the first gear 142 drives the second gear 143. The second gear 143 meshes with the rack 145, thereby driving the lightweight transmission shaft 11 in the annular magnetorheological fluid cavity 7 to rotate synchronously and change the transmission angle, realizing the simulation of different road conditions;

[0052] During this period, the first electric slip ring assembly 9 is adjusted by the control device 13 to change the current intensity of the electromagnetic part 8 of the annular magnetorheological fluid cavity 7. The magnetorheological fluid changes from a liquid state to a semi-solid state, with internal stress and volume changes, pushing the flexible diaphragm 12 to expand, closely fitting and fixing the lightweight transmission shaft 11, dynamically adjusting its support stiffness and damping ratio, and precisely simulating the vibration shocks under different degrees of bumpy road conditions;

[0053] The flexible pressure detection piece 15 on the flexible diaphragm 12 in the annular magnetorheological fluid cavity 7 detects the surface pressure of the transmission shaft in real time, and the pressure detection block 185 detects the pressing pressure at the end of the transmission shaft. Combining the detection data of the annular magnetorheological fluid cavity 7 and the flexible pressure detection piece 15, these data are transmitted to the control device 13 through the power connection part 16 and the second electric slip ring assembly 17. The control device 13 analyzes the collected data to comprehensively evaluate the performance of the lightweight transmission shaft 11 under different working conditions, providing a strong basis for its quality inspection and optimal design.

[0054] 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 principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lightweight transmission shaft detection device, comprising a detection platform (1), wherein a first support block (2) and a second support block (3) are respectively mounted on the detection platform (1), characterized in that: A sliding groove (4) is provided in the first support block (2), a sliding block (5) is slidably connected in the sliding groove (4), and an electric push rod (6) is installed on the first support block (2); An annular magnetorheological fluid cavity (7) is rotatably disposed in both the sliding block (5) and the second support block (3); the electromagnetic parts (8) on the two annular magnetorheological fluid cavities (7) are connected to a first electric slip ring assembly (9); the two first electric slip ring assemblies (9) are respectively mounted on one side of the sliding block (5) and the second support block (3) via a fixing frame (10); and a lightweight transmission shaft (11) is mounted between the two annular magnetorheological fluid cavities (7); A flexible diaphragm (12) is provided at a contact portion between the annular magnetorheological fluid cavity (7) and the lightweight transmission shaft (11); a control device (13) is fixedly mounted on one side of the second support block (3); and the two first electric slip ring assemblies (9) are connected to the control device (13); A plurality of flexible pressure detection sheets (15) are mounted on the flexible diaphragm (12) on the inner surface of each annular magnetorheological fluid cavity (7); the plurality of flexible pressure detection sheets (15) are generally annular in shape; and the plurality of flexible pressure detection sheets (15) are connected to a second electric slip ring assembly (17) via an electrical connection portion (16); The second electric slip ring assembly (17) is connected to the control device (13), and each of the second electric slip ring assemblies (17) is fixedly mounted on a fixing frame (10) on a corresponding side. The pressure detection data of the plurality of flexible pressure detection sheets (15) are uniformly transmitted to the control device (13), and the data is analyzed by the control device (13).

2. A lightweight transmission shaft detection device according to claim 1, characterized in that: A synchronous driving mechanism (14) is provided on one side of the second supporting block (3).

3. A lightweight transmission shaft detection device according to claim 2, characterized in that: The synchronous drive mechanism (14) comprises a gear ring (141) mounted on one side of the annular magnetorheological fluid cavity (7) on the second support block (3); a first gear (142) is rotatably arranged on one side of the sliding block (5); the first gear (142) meshes with the gear ring (141); a second gear (143) is fixedly mounted on one side of the first gear (142); the tooth diameters of the second gear (143) and the gear ring (141) are both smaller than those of the first gear (142); a rack (145) is fixedly mounted on one side of the second support block (3) via a side frame (144); the second gear (143) and the rack (145) mesh with each other; When the sliding block (5) is driven to extend and retract, the transmission between the gear ring (141) and the rack (145) drives the lightweight transmission shaft (11) clamped by the magnetic fluid in the annular magnetorheological fluid cavity (7) to rotate synchronously.

4. A lightweight transmission shaft detection device according to claim 1, characterized in that: A pressure adjustment mechanism (18) is provided on one side of each of the two annular magnetorheological fluid cavities (7).

5. A lightweight transmission shaft detection device according to claim 4, characterized in that: The pressure regulating mechanism (18) comprises an elastic telescopic tube (181) and a movable rod (182) capable of being telescopically moved at one end of the elastic telescopic tube (181); a spring (183) is arranged in the elastic telescopic tube (181); a movable block (184) sliding in the elastic telescopic tube (181) is fixedly arranged at one end of the movable rod (182); one side of the spring (183) is pressed against one side of the movable block (184).

6. A lightweight transmission shaft detection device according to claim 5, characterized in that: A pressure detection block (185) is fixedly provided at the other end of the movable rod (182), and a pressure block (186) is rotatably provided on one side of the pressure detection block (185). One side of the pressure block (186) is pressed against one end of the installed lightweight transmission shaft (11) and cooperates with the expansion clamping of the flexible diaphragm (12) in the annular magnetorheological fluid cavity (7), so that the lightweight transmission shaft (11) can be kept relatively stably installed.

7. A lightweight transmission shaft detection device according to claim 5, characterized in that: A threaded adjustment rod (187) is threadedly connected to one side of each elastic telescopic cylinder (181); an adjustment block (188) that slides inside the elastic telescopic cylinder (181) is rotatably provided at one end of the threaded adjustment rod (187); and the other end of the spring (183) abuts against one side of the adjustment block (188).

8. A lightweight transmission shaft detection device according to claim 7, characterized in that: A turning handle (189) is fixedly provided on the outer end of the threaded adjustment rod (187), and the outer portion of the elastic telescopic cylinder (181) is fixedly connected to one side of the sliding block (5) via a connecting arm (1810).

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