Basalt fiber plate spring torsional fatigue test device

Abstract

This utility model relates to a torsional fatigue testing device for basalt fiber leaf springs, specifically within the technical field of automotive leaf spring torsional testing equipment. It includes a test bench, a central load loader positioned above the test bench, and a side torsion mechanism. The central load loader is connected to the middle of the leaf spring assembly, while the side torsion mechanism acts upwards on the lower side of the leaf spring assembly, torsioning the ends of the assembly. During the test, the central load loader applies a load to the middle of the leaf spring assembly, positioning it while simulating the forces acting on the assembly during actual driving. Simultaneously, the side torsion mechanism activates, acting upwards on the lower side of the leaf spring assembly, torsioning the ends to simulate the torsional load experienced by the leaf spring assembly during driving. This tests the fatigue performance of the leaf spring assembly under torsional loads during driving, thereby improving the accuracy of the leaf spring torsional fatigue test.

Description

Technical Field

[0001] This utility model relates to the technical field of automotive leaf spring torsion testing equipment, and in particular to a torsional fatigue testing device for basalt fiber leaf springs. Background Technology

[0002] Automotive leaf springs are the most traditional elastic elements in automotive suspension systems. They are generally composed of several spring steel leaves of unequal length, forming a spring beam with approximately equal strength. In automotive suspension systems, in addition to their cushioning function, leaf springs can balance the weight of the vehicle body and provide stable suspension performance. Their unique working principle allows torsion leaf springs to absorb and disperse vibrations, reduce wear on mechanical parts, and improve the stability and durability of the system. Existing leaf spring materials include not only traditional steel but also composite materials and non-metallic materials, such as basalt fiber leaf springs.

[0003] After the leaf spring is manufactured, its mechanical properties need to be tested, analyzed and evaluated. The torsion test of automotive leaf springs is mainly used to evaluate its fatigue resistance and structural integrity under dynamic torque load. It is usually tested by a special torsion testing machine. First, the leaf spring is installed on the base, and a hydraulic or electric loading system is applied to the leaf spring. The relationship between torque and torsion angle is recorded in real time by an angle displacement sensor, and pressure data is monitored in real time by a pressure sensor.

[0004] In related technologies, reference can be made to Chinese invention patent CN108692924B, which discloses a torsional fatigue testing device for automotive leaf springs. The device includes two columns corresponding to the two ends of the leaf spring to be tested, a simulated axle housing end mounted in the middle of the leaf spring to simulate the end of a real vehicle's drive axle, an adjustment mechanism for adjusting the compression of the leaf spring, and a loading mechanism for simulating the torsional load on the leaf spring. Both columns are equipped with clamp assemblies for fixing one end of the leaf spring. The leaf spring is subjected to torsional loading by rotating a hydraulic cylinder, and a telescopic drive shaft is added between the cylinder and the leaf spring to simulate real vehicle conditions, thereby testing the torsional fatigue performance of the leaf spring.

[0005] However, during vehicle operation, the leaf spring is not only subjected to load in the middle, but also at both ends where it connects to the vehicle body. Currently, there is no testing device to perform torsional fatigue tests on the two ends of the leaf spring. Therefore, it is impossible to fully reflect the fatigue performance of the leaf spring under torsional loads during operation, thus reducing the accuracy of leaf spring torsional fatigue tests. Utility Model Content

[0006] To improve the accuracy of leaf spring torsional fatigue testing, this invention provides a torsional fatigue testing device for basalt fiber leaf springs.

[0007] The torsional fatigue testing device for basalt fiber leaf springs provided in this application adopts the following technical solution:

[0008] A torsional fatigue testing device for basalt fiber leaf springs includes a test bench, a central load loader located above the test bench, and a side torsion mechanism. The central load loader is connected to the middle of the leaf spring assembly, and the side torsion mechanism acts from bottom to top on the lower side of the leaf spring assembly and is used to torsion the end of the leaf spring assembly.

[0009] By adopting the above technical solution, the middle part of the leaf spring assembly is connected to the central load loader. During the test, the central load loader applies a load to the middle part of the leaf spring assembly, positioning the leaf spring assembly while simulating the force on the leaf spring assembly during actual driving. At the same time, the side torsion mechanism is activated and acts on the lower side of the leaf spring assembly, driving the end of the leaf spring assembly to twist from bottom to top, simulating the torsional load on the end of the leaf spring assembly during driving. This tests the fatigue performance of the leaf spring assembly under torsional load during driving, thereby improving the accuracy of the leaf spring torsional fatigue test.

[0010] Optionally, the leaf spring assembly is provided with lifting lugs at both ends, and the test bench is provided with an assembly trolley corresponding to each lifting lug. The assembly trolley is provided with two limiting plates facing each other, and an installation groove is formed between the two limiting plates on the same assembly trolley. The leaf spring assembly passes through the installation groove, and a support rod passes through the lifting lug. The two ends of the support rod are respectively installed on the two limiting plates of the same assembly trolley.

[0011] By adopting the above technical solution, the assembly trolley is placed on the test bench, and the two ends of the leaf spring assembly are respectively inserted into the two mounting slots. At the same time, the lifting lug is located in the mounting slot, and the support rod is connected to the limit plate on the corresponding assembly trolley to support the leaf spring assembly.

[0012] Optionally, the assembly trolley is provided with a support plate on its side, the support plate extends horizontally and extends out of the test bench, and the side torsion mechanism acts on the support plate.

[0013] By adopting the above technical solution, the support plate extends out of the test bench, and the side torsion mechanism acts on the support plate, driving the support plate to rise from bottom to top, thereby achieving the effect of torsion on the end of the leaf spring assembly to simulate the torsional load on the end of the leaf spring assembly during driving.

[0014] Optionally, the side torsion mechanism includes:

[0015] A wheel, located to the side of a support plate and rotatably mounted on a test bench via a rotating shaft, the rotating shaft being parallel to the support rod;

[0016] The cam is eccentrically mounted on the side of the wheel close to the assembly trolley and located below the support plate. When the cam rotates with the wheel to the highest point, the height of the highest point of the cam is higher than the height of the support plate in the initial state and is used to drive the support plate to be raised.

[0017] A drive unit, which is connected to the wheel and is used to drive the wheel to rotate.

[0018] By adopting the above technical solution, the drive unit starts and drives the wheel to rotate. The rotation of the wheel drives the cam to rotate. The cam rotates from below the support plate until it abuts against the support plate. Then the cam rotates and pushes the support plate to rise. As the wheel rotates, the cam causes the support plate to rise in a cycle, so as to continuously twist the end of the leaf spring assembly. Changing the size of the cam can adjust the intensity of the torsion. In conjunction with the drive unit, the rotational speed of the wheel can be adjusted, thereby adjusting the torsion frequency. This improves the accuracy of simulating the torsional load on the leaf spring assembly during driving, and thus tests the fatigue performance of the leaf spring assembly under torsional load during driving, thereby improving the accuracy of leaf spring torsional fatigue test.

[0019] Optionally, the wheel is provided with a mounting shaft parallel to the rotation axis, and the cam is rotatably mounted on the mounting shaft.

[0020] Optionally, the driving component includes a drive wheel and a transmission belt. The drive wheel is driven to rotate by a motor, and the transmission belt is sleeved on the drive wheel and the wheel disc.

[0021] By adopting the above technical solution, the motor drives the drive wheel to rotate, and the rotation of the drive wheel drives the disc to rotate synchronously through the transmission belt. By adjusting the speed of the drive wheel, the speed of the disc can be adjusted to simulate different torsional frequencies.

[0022] Optionally, there are two wheels, both of which are rotatably mounted on the side of the test bench and correspond one-to-one with the assembly trolley and are located on the same side of the leaf spring assembly. Each wheel is eccentrically mounted with a cam.

[0023] By adopting the above technical solution, the two discs can simultaneously perform torsional fatigue tests on both ends of the leaf spring assembly. After the test on one side is completed, the leaf spring assembly can be reversed to test both ends on the other side of the leaf spring assembly, thereby improving the convenience of the test.

[0024] Optionally, the drive wheel is located below the two discs, and the drive wheel and the two discs are connected by the same drive belt.

[0025] By adopting the above technical solution, the motor starts and drives the drive wheel to rotate. The rotation of the drive wheel drives the two discs to rotate through the transmission belt, thereby improving the convenience of torsional fatigue testing of the leaf spring assembly.

[0026] Optionally, the driving component is a drive motor, and the output end of the drive motor is connected to the rotating shaft for transmission.

[0027] By adopting the above technical solution, the drive motor is directly connected to the rotating shaft, which allows for direct adjustment of the wheel speed to simulate different torsional frequencies, thereby improving the convenience of the experiment.

[0028] Optionally, the side torsion mechanism includes:

[0029] A wedge block is slidably disposed on the test table in a direction close to or away from the support plate. During the test, the wedge block slides and extends below the support plate.

[0030] A pulley is rotatably positioned at the highest point of the wedge block. When the pulley moves with the wedge block to below the support plate, the height of the highest point of the pulley is higher than the height of the support plate in the initial state and is used to lift the support plate.

[0031] A linear reciprocating actuator is provided on a test bench, with its driving end connected to the end of a wedge block away from the support plate. The linear reciprocating actuator is used to drive the wedge block to slide toward or away from the support plate.

[0032] By adopting the above technical solution, the linear reciprocating actuator drives the wedge block to move towards the support plate. The movement of the wedge block drives the pulley to move. The pulley first abuts against the support plate, and then the pulley pushes the support plate up. With the reciprocating driving action of the linear reciprocating actuator, the support plate has a periodic lifting effect, so as to continuously twist the end of the leaf spring assembly. Changing the size of the pulley can adjust the torsional amplitude, and adjusting the reciprocating driving frequency of the linear reciprocating actuator can adjust the torsional frequency. This improves the accuracy of simulating the torsional load on the leaf spring assembly during driving, thereby testing the fatigue performance of the leaf spring assembly under torsional load during driving, and thus improving the accuracy of leaf spring torsional fatigue test.

[0033] In summary, this application includes at least one of the following beneficial technical effects:

[0034] 1. Connect the middle part of the leaf spring assembly to the center load loader. During the test, the center load loader applies a load to the middle part of the leaf spring assembly, positioning the leaf spring assembly while simulating the force on the leaf spring assembly during actual driving. At the same time, the side torsion mechanism is activated and acts on the lower side of the leaf spring assembly, driving the end of the leaf spring assembly to twist from bottom to top, simulating the torsional load on the end of the leaf spring assembly during driving. This tests the fatigue performance of the leaf spring assembly under torsional load during driving, thereby improving the accuracy of the leaf spring torsional fatigue test.

[0035] 2. The drive unit starts and drives the wheel to rotate. The rotation of the wheel drives the cam to rotate. The cam rotates from below the support plate until it abuts against the support plate. Then the cam rotates and pushes the support plate to rise. As the wheel rotates, the cam causes the support plate to rise in a cycle, so as to continuously twist the end of the leaf spring assembly. Changing the size of the cam can adjust the intensity of the torsion. In conjunction with the drive unit, the rotational speed of the wheel can be adjusted, thereby adjusting the torsion frequency. This improves the accuracy of simulating the torsional load on the leaf spring assembly during driving, and thus tests the fatigue performance of the leaf spring assembly under torsional load during driving, thereby improving the accuracy of leaf spring torsional fatigue test.

[0036] 3. By setting two discs, it is convenient to conduct torsional fatigue tests on both ends of the leaf spring assembly simultaneously. After the test on one side is completed, the leaf spring assembly can be reversed to test both ends on the other side, thereby improving the convenience of the test.

[0037] 4. Through the cooperation of the linear reciprocating driver, pulley and wedge block, the pulley moves and has a periodic lifting effect on the support plate, so as to continuously twist the end of the leaf spring assembly. Changing the size of the pulley can adjust the torsion amplitude, and adjusting the reciprocating drive frequency of the linear reciprocating driver can adjust the torsion frequency, thereby improving the convenience of torsional fatigue testing of basalt fiber leaf springs. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the leaf spring assembly in this application;

[0039] Figure 2 This is a schematic diagram of the overall structure of Embodiment 1 of this application, wherein the arrow on the central load loader indicates the direction of load application, and the arrow on the wheel indicates the direction of wheel rotation;

[0040] Figure 3 This is a side view of the overall structure of embodiments 1-4 of this application, wherein the arrow on the central load loader indicates the direction of load application, and the arrow on the wheel indicates the direction of wheel rotation;

[0041] Figure 4 This is a side view of the overall structure of Embodiment 5 of this application, wherein the arrow on the central load loader indicates the direction of load application, and the arrow on the wheel indicates the direction of wheel rotation;

[0042] Figure 5 This is a schematic diagram of the overall structure of Embodiment 6 of this application, wherein the arrow on the central load loader indicates the direction of load application;

[0043] Figure 6 This is a top view of the overall structure of Embodiment 6 of this application.

[0044] Reference numerals: 1. Leaf spring assembly; 11. Lifting lug; 2. Test bench; 21. Assembly trolley; 22. Limiting plate; 221. Mounting groove; 23. Support rod; 24. Support plate; 25. Fixing frame; 26. Support platform; 3. Center load loader; 4. Side torsion mechanism; 41. Wheel; 411. Rotating shaft; 412. Mounting shaft; 42. Cam; 43. Driving component; 431. Drive wheel; 432. Transmission belt; 433. Drive motor; 44. Wedge block; 441. Rotating groove; 442. Rotating shaft; 45. Pulley; 46. Linear reciprocating driver; 47. Connecting plate. Detailed Implementation

[0045] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0046] Reference Figure 1 This application discloses a torsional fatigue testing device for basalt fiber leaf springs. The leaf spring assembly 1 mentioned in all embodiments of this application is a composite of multiple leaf springs of varying lengths made of basalt fiber.

[0047] Example 1

[0048] Reference Figure 1 , Figure 2 and Figure 3 A torsional fatigue testing device for basalt fiber leaf springs includes a test bench 2, a central load loader 3 located above the test bench 2, and a side torsion mechanism 4. The central load loader 3 is connected to the middle of the leaf spring assembly 1, and the side torsion mechanism 4 acts on the lower side of the leaf spring assembly 1 from bottom to top and is used to torsion the end of the leaf spring assembly 1.

[0049] Reference Figure 1 , Figure 2 and Figure 3The middle part of the leaf spring assembly 1 is fixedly connected to the center load loader 3 by bolts, nuts and other structures. The center load loader 3 can use existing hydraulic or electric loading systems to load the load. Different loads can be applied according to the test requirements. It not only fixes the middle part of the leaf spring assembly 1 when the end of the leaf spring assembly 1 is torn, but also simulates the load on the middle part of the leaf spring assembly 1 during actual driving as required.

[0050] Reference Figure 1 , Figure 2 and Figure 3 Both ends of the leaf spring assembly 1 are provided with lifting lugs 11. The test bench 2 is provided with assembly trolleys 21 corresponding to the lifting lugs 11. The upper surface of the assembly trolley 21 is provided with two limiting plates 22 facing each other. An installation groove 221 is formed between the two limiting plates 22 located on the same assembly trolley 21. The length direction of the installation groove 221 is consistent with the length direction of the leaf spring assembly 1, and the leaf spring assembly 1 passes through the installation groove 221. The lifting lug 11 has holes that penetrate through the two side walls of the lifting lug 11. The axial extension direction of the holes is perpendicular to the length extension direction of the leaf spring assembly 1. A support rod 23 passes through the holes. Both limiting plates 22 have through holes that are consistent with the axial direction of the support rod 23. The two ends of the support rod 23 pass through the two through holes respectively, and both ends of the support rod 23 are threaded with positioning nuts (not shown in the figure).

[0051] Reference Figure 1 , Figure 2 and Figure 3 During installation, the end of the leaf spring assembly 1 is inserted into the mounting groove 221. The support rod 23 is then passed through the first through hole and the lifting lug 11 in sequence and then out through another through hole. Finally, the positioning nuts are tightened at both ends of the support rod 23 so that the positioning nuts are pressed against the outer wall of the limiting plate 22 away from the mounting groove 221, thereby realizing the detachable connection between the leaf spring assembly 1 and the assembly trolley 21. The same applies to the other side.

[0052] Reference Figure 1 , Figure 2 and Figure 3 Both assembly trolleys 21 are provided with support plates 24 on their sides. The support plates 24 extend horizontally and protrude from the test bench 2. The side torsion mechanism 4 acts on the support plates 24.

[0053] Reference Figure 2 and Figure 3The side torsion mechanism 4 includes a wheel 41, a cam 42, and a drive component 43. There are two wheels 41, both of which are rotatably mounted on the side of the test bench 2 and correspond one-to-one with the assembly trolley 21 and are located on the same side of the leaf spring assembly 1. The two wheels 41 are respectively located on the side of the corresponding support plate 24. The following description only takes one wheel 41 as an example. The wheel 41 is rotatably mounted on the test bench 2 via a rotating shaft 411. The rotating shaft 411 is rotatably mounted on the lower surface of the test bench 2 and is parallel to the support rod 23. The wheel 41 is coaxially fixed at the end of the rotating shaft 411 away from the test bench 2. The distance between the wheel 41 and the side of the test bench 2 is greater than the distance by which the support plate 24 extends out of the test bench 2.

[0054] Reference Figure 2 and Figure 3 There are two cams 42, each corresponding to one of the wheel 41. The following description uses only one cam 42 as an example. The cam 42 is eccentrically located on the side of the wheel 41 near the assembly trolley 21 and below the support plate 24. The wheel 41 has a mounting shaft 412 parallel to the rotating shaft 411. The mounting shaft 412 extends horizontally and is located below the support plate 24. The mounting shaft 412 is a screw shaft. The cam 42 is threadedly connected to the mounting shaft 412, and the mounting shaft 412 is threadedly connected to a nut (not shown in the figure) for positioning the cam 42. After installation, the nut is pressed against the cam 42 to fix the cam 42. When the cam 42 rotates to the highest point with the wheel 41, the height of the highest point of the cam 42 is higher than the height of the support plate 24 in the initial state, thereby raising the support plate 24.

[0055] Reference Figure 2 The driving component 43 is connected to the wheel 41 and is used to drive the wheel 41 to rotate. The driving component 43 includes a driving wheel 431 and a transmission belt 432. A fixed frame 25 is provided on the ground below the test bench 2 to support the driving wheel 431. The driving wheel 431 is rotatably mounted on the fixed frame 25. The driving wheel 431 is located between the two wheel 41s, and the distance between the driving wheel 431 and the two wheel 41s is the same. A motor (not shown in the figure) is provided on the fixed frame 25 to drive the driving wheel 431 to rotate. The transmission belt 432 is sleeved on the driving wheel 431 and the two wheel 41s, that is, the driving wheel 431 and the two wheel 41s are connected by the same transmission belt 432.

[0056] Reference Figure 1 , Figure 2 and Figure 3 Before the test, the two assembly trolleys 21 are connected to the lifting lugs 11, and then the leaf spring assembly 1 is connected to the center load loader 3. The center load loader 3 applies a load to the middle part of the leaf spring assembly 1. Then the cam 42 required for the test is installed so that the cam 42 is fixed on the mounting shaft 412.

[0057] Reference Figure 1, Figure 2 and Figure 3 Initially, cam 42 is located below rotating shaft 411. Then, the motor is started, and drive wheel 431 drives two discs 41 to rotate in the same direction via transmission belt 432. The rotation of discs 41 drives cam 42 to rotate from bottom to top along the circumference of disc 41. The purpose of eccentric setting of cam 42 is that as cam 42 rotates, cam 42 abuts against support plate 24 and raises support plate 24. The force is transmitted to limit plate 22 near disc 41 through support plate 24. Limit plate 22 is raised and pushes one side of the end of leaf spring assembly 1 to lift upward. Due to the action of cam 42, the lifting height of the side of leaf spring assembly 1 away from disc 41 is less than that of the side near disc 41, thereby achieving the effect of torsion of the end of basalt fiber leaf spring.

[0058] The working principle of Embodiment 1 of this application is as follows:

[0059] The periodic rotation of the wheel 41 causes the support plate 24 to rise periodically, thereby continuously torsion the end of the basalt fiber leaf spring. Changing the cam 42 with different diameters can change the height of the leaf spring assembly 1, thus changing the torsional strength. Adjusting the speed of the drive wheel 431 by the motor can change the torsional frequency. Both ends of the leaf spring assembly 1 on the same side can be tested at once. After the test on the same side is completed, the leaf spring assembly 1 can be disassembled and reinstalled in the opposite direction to test both ends on the other side. This improves the accuracy of simulating the torsional load on the leaf spring assembly 1 during driving, thereby testing the fatigue performance of the leaf spring assembly 1 under torsional load during driving and improving the accuracy of leaf spring torsional fatigue test.

[0060] Example 2

[0061] Reference Figure 3 A torsional fatigue testing device for basalt fiber leaf springs differs from Embodiment 1 in that, in this embodiment, the cam 42 is rotatably mounted on the mounting shaft 412, and a nut (not shown in the figure) is threaded onto the mounting shaft 412 to prevent the cam 42 from slipping off the mounting shaft 412. When the cam 42 is fixed on the mounting shaft 412, as the wheel 41 rotates, the cam 42 is subjected to the squeezing and frictional force of the support plate 24, which will cause it to tend to rotate. Setting it to rotate is to reduce friction and thus reduce wear.

[0062] The working principle of this embodiment is basically the same as that of Embodiment 1, and will not be described again here.

[0063] Example 3

[0064] Reference Figure 2A torsional fatigue test device for basalt fiber leaf springs, which differs from Embodiment 1 in that a transmission chain is used instead of the transmission belt 432 in this embodiment, and both the drive wheel 431 and the wheel disc 41 are sprockets.

[0065] The working principle of this embodiment is basically the same as that of Embodiment 1, and will not be described again here.

[0066] Example 4

[0067] Reference Figure 3 A torsional fatigue testing device for basalt fiber leaf springs differs from Embodiment 1 in that, in this embodiment, only one wheel 41 is provided. During the test, only one side of one end of the leaf spring assembly 1 is tested at a time. If it is necessary to test both sides of both ends of the leaf spring assembly 1, a total of four tests are required, thereby expanding the comprehensiveness of the test.

[0068] The working principle of this embodiment is basically the same as that of Embodiment 1, and will not be described again here.

[0069] Example 5

[0070] Reference Figure 3 and Figure 4 A torsional fatigue testing device for basalt fiber leaf springs is different from that in Embodiment 1. In this embodiment, the driving component 43 is a driving motor 433. There are two driving motors 433, which correspond one-to-one with the wheel 41. The test bench 2 is provided with a support platform 26 on the side. Both driving motors 433 are fixed on the support platform 26. The output end of the driving motor 433 is connected to the corresponding rotating shaft 411.

[0071] The working principle of this embodiment is basically the same as that of embodiment 1. The difference is that the rotation speed of the two discs 41 can be adjusted separately in this embodiment to simulate more stress conditions, thereby improving the comprehensiveness and accuracy of the leaf spring torsional fatigue test.

[0072] Example 6

[0073] Reference Figure 3 , Figure 5 and Figure 6 A torsional fatigue test device for basalt fiber leaf springs is different from that in embodiment 1. In this embodiment, there are two side torsion mechanisms 4, which correspond one-to-one with the support plate 24, and the support plate 24 is located above the test bench 2. The following description only uses one side torsion mechanism 4 as an example.

[0074] Reference Figure 5 and Figure 6The side torsion mechanism 4 includes a wedge block 44, a pulley 45, and a linear reciprocating driver 46. The wedge block 44 is slidably disposed on the test bench 2 along the direction close to or away from the support plate 24, and the sliding direction of the wedge block 44 is parallel to the length direction of the leaf spring assembly 1. During the test, the wedge block 44 slides and extends below the support plate 24. In this embodiment, the wedge block 44 is a triangular wedge block 44. In other feasible embodiments, the wedge block 44 can also be a regular wedge block 44, with the lower end of the wedge block 44 facing the support plate 24 and the higher end away from the support plate 24.

[0075] Reference Figure 5 and Figure 6 The pulley 45 is rotatably located at the highest point of the wedge block 44. When the pulley 45 moves with the wedge block 44 to below the support plate 24, the height of the highest point of the pulley 45 is higher than the height of the support plate 24 in the initial state and is used to drive the support plate 24 to be raised. The pulley 45 is detachably located at the highest point of the wedge block 44.

[0076] Reference Figure 5 and Figure 6 The detachable connection method provided in this embodiment is as follows: the upper surface of the highest point of the wedge block 44 has a downwardly recessed arc-shaped rotating groove 441. A rotating shaft 442 is horizontally inserted into the rotating groove 441 of the pulley 45. The extension direction of the rotating shaft 442 is perpendicular to the length direction of the leaf spring assembly 1. The two ends of the rotating shaft 442 extend out of the opposite side walls of the top of the wedge block 44. The pulley 45 is coaxially sleeved on the rotating shaft 442 and can rotate around the axis of the rotating shaft 442. The lower half of the pulley 45 is located in the rotating groove 441, and the upper half of the pulley 45 protrudes above the wedge block 44. The two ends of the rotating shaft 442 are threaded with positioning blocks (not shown in the figure) for positioning the rotating shaft 442. After positioning, the positioning blocks abut against the outer side wall of the wedge block 44. In other feasible embodiments, the detachable connection method is not limited.

[0077] Reference Figure 5 and Figure 6 A linear reciprocating actuator 46 is mounted on the test bench 2, and its driving end is connected to the end of the wedge block 44 away from the support plate 24. The linear reciprocating actuator 46 is used to drive the wedge block 44 to slide toward or away from the support plate 24. In this embodiment, the linear reciprocating actuator 46 is a pneumatic hydraulic cylinder in the prior art. The pneumatic hydraulic cylinder is detachably mounted on the test bench 2 by bolts. The driving end is the reciprocating piston rod of the pneumatic hydraulic cylinder. The end of the wedge block 44 away from the support plate 24 has a connecting plate 47. The piston rod is fixedly connected to the connecting plate 47. When the pneumatic hydraulic cylinder extends, it pushes the wedge block 44 to move toward the support plate 24. When the pneumatic hydraulic cylinder retracts, it pulls the wedge block 44 back and away from the support plate 24.

[0078] In other feasible embodiments, only one side torsion mechanism 4 may be provided, and the linear reciprocating drive 46 may also be a hydraulic cylinder. During the test, only one side of one end of the leaf spring assembly 1 is tested at a time. If it is necessary to test both sides of both ends of the leaf spring assembly 1, a total of four tests are required to expand the comprehensiveness of the test.

[0079] The working principle of Embodiment 6 of this application is as follows:

[0080] The linear reciprocating actuator 46 drives the wedge block 44 to move towards the support plate 24. The movement of the wedge block 44 drives the pulley 45 to move. The pulley 45 first abuts against the support plate 24, and then the pulley 45 pushes the support plate 24 to rise. With the reciprocating drive of the linear reciprocating actuator 46, the support plate 24 is lifted periodically, so as to continuously twist the end of the leaf spring assembly 1. Changing the diameter of the pulley 45 can adjust the twisting amplitude, and adjusting the reciprocating drive frequency of the linear reciprocating actuator 46 can adjust the twisting frequency. Two linear reciprocating actuators are set up. The reciprocating actuator 46 can test both ends of the leaf spring assembly 1 on the same side at once. After the test on the same side is completed, the leaf spring assembly 1 can be disassembled and reinstalled in the opposite direction to test both ends of the other side of the leaf spring assembly 1. At the same time, the diameters of the two pulleys 45 and the reciprocating drive frequency of the linear reciprocating actuator 46 can be adjusted according to the test requirements to improve the comprehensiveness of the simulation of the torsional load on the leaf spring assembly 1 during driving, thereby testing the fatigue performance of the leaf spring assembly 1 under the torsional load during driving and improving the accuracy of the leaf spring torsional fatigue test.

[0081] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A testing device for torsional fatigue testing of basalt fiber leaf springs, characterized in that: It includes a test bench (2), a central load loader (3) located above the test bench (2), and a side torsion mechanism (4). The central load loader (3) is connected to the middle of the leaf spring assembly (1). The side torsion mechanism (4) acts on the lower side of the leaf spring assembly (1) from bottom to top and is used to torsion the end of the leaf spring assembly (1).

2. The torsional fatigue testing device for basalt fiber leaf springs according to claim 1, characterized in that: The leaf spring assembly (1) is provided with lugs (11) at both ends. The test bench (2) is provided with assembly trolleys (21) corresponding to the lugs (11). The assembly trolley (21) is provided with two limiting plates (22) opposite to each other. An installation groove (221) is formed between the two limiting plates (22) on the same assembly trolley (21). The leaf spring assembly (1) passes through the installation groove (221). A support rod (23) passes through the lugs (11). The two ends of the support rod (23) are respectively installed on the two limiting plates (22) of the same assembly trolley (21).

3. The torsional fatigue testing device for basalt fiber leaf springs according to claim 2, characterized in that: The assembly trolley (21) is provided with a support plate (24) on its side. The support plate (24) extends horizontally and extends out of the test bench (2). The side torsion mechanism (4) acts on the support plate (24).

4. The torsional fatigue testing device for basalt fiber leaf springs according to claim 3, characterized in that: The side torsion mechanism (4) includes: A wheel (41) is located on the side of the support plate (24) and is rotatably mounted on the test bench (2) via a rotating shaft (411), the rotating shaft (411) being parallel to the support rod (23); Cam (42) is eccentrically located on the side of the wheel (41) near the assembly trolley (21) and below the support plate (24). When the cam (42) rotates to the highest point with the wheel (41), the height of the highest point of the cam (42) is higher than the height of the support plate (24) in the initial state and is used to drive the support plate (24) to rise. A drive unit (43) is connected to a wheel (41) and is used to drive the wheel (41) to rotate.

5. The torsional fatigue testing device for basalt fiber leaf springs according to claim 4, characterized in that: The wheel (41) is provided with a mounting shaft (412) parallel to the rotating shaft (411), and the cam (42) is rotatably mounted on the mounting shaft (412).

6. The torsional fatigue testing device for basalt fiber leaf springs according to claim 4, characterized in that: The driving component (43) includes a drive wheel (431) and a transmission belt (432). The drive wheel (431) is driven to rotate by a motor, and the transmission belt (432) is sleeved on the drive wheel (431) and the wheel disc (41).

7. The torsional fatigue testing device for basalt fiber leaf springs according to claim 6, characterized in that: Two wheel disks (41) are provided. Both wheel disks (41) are rotatably located on the side of the test bench (2) and correspond one-to-one with the assembly trolley (21) and are located on the same side of the leaf spring assembly (1). Each wheel disk (41) is eccentrically provided with a cam (42).

8. The torsional fatigue testing device for basalt fiber leaf springs according to claim 7, characterized in that: The drive wheel (431) is located below the two discs (41), and the drive wheel (431) and the two discs (41) are connected by the same drive belt (432).

9. The torsional fatigue testing device for basalt fiber leaf springs according to claim 4, characterized in that: The driving component (43) is a drive motor (433), and the output end of the drive motor (433) is connected to the rotating shaft (411) for transmission.

10. The torsional fatigue testing device for basalt fiber leaf springs according to claim 3, characterized in that: The side torsion mechanism (4) includes: A wedge block (44) is slidably disposed on the test bench (2) in a direction close to or away from the support plate (24). During the test, the wedge block (44) slides and extends below the support plate (24). A pulley (45) is rotatably positioned at the highest point of the wedge block (44). When the pulley (45) moves with the wedge block (44) to below the support plate (24), the height of the highest point of the pulley (45) is higher than the height of the support plate (24) in the initial state and is used to drive the support plate (24) to be raised. A linear reciprocating driver (46) is provided on the test bench (2) and its driving end is connected to the end of the wedge block (44) away from the support plate (24). The linear reciprocating driver (46) is used to drive the wedge block (44) to slide toward or away from the support plate (24).

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