Testing device for torsional fatigue test of basalt fiber plate spring

Abstract

The invention relates to a basalt fiber plate spring torsion fatigue test device, and relates to the technical field of automobile plate spring torsion test equipment, the basalt fiber plate spring torsion fatigue test device comprises a test bench, a center load loader and a side torsion mechanism, the center load loader is arranged above the test bench, and the center load loader is connected with the middle part of a plate spring assembly; the side edge twisting mechanism acts on the lower side of the plate spring assembly from bottom to top and is used for twisting the end of the plate spring assembly. During a test, the central load loader applies a load to the middle of the plate spring assembly, the plate spring assembly is positioned, simulation is performed according to the stress of the plate spring assembly in the actual driving process, and the side torsion mechanism is started to act on the lower side of the plate spring assembly to drive the end of the plate spring assembly to twist from bottom to top. The torsion load applied to the end of the plate spring assembly during driving is simulated, so that the fatigue performance of the torsion load applied to the plate spring assembly during driving is tested, and the accuracy of the torsion fatigue test of the plate spring is improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile leaf spring torsion testing equipment, in particular to a basalt fiber leaf spring torsion fatigue test device. Background Art

[0002] Automobile leaf springs are the most traditional elastic elements in automobile suspension systems. They are generally composed of several pieces of spring steel of unequal lengths to form a group of spring beams of approximately equal strength. In automobile suspension systems, in addition to acting as buffers, leaf springs can be used to balance the weight of the vehicle body and provide stable suspension performance. Their unique working principle enables torsion leaf springs to absorb and disperse vibrations, reduce wear on mechanical components, and improve the stability and durability of the system. In addition to traditional steel, existing leaf spring materials also include composite materials and non-metallic materials, such as basalt fiber leaf springs.

[0003] After the leaf spring is produced, its mechanical properties need to be tested, analyzed and evaluated. The torsion test of automobile leaf springs is mainly used to evaluate its fatigue resistance and structural integrity under dynamic torque load. It is usually tested through a dedicated 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 through an angle displacement sensor, and a pressure sensor is equipped to monitor pressure data in real time.

[0004] In the related art, reference may be made to the Chinese invention patent with authorization announcement number CN108692924B, which discloses a torsional fatigue testing device for automobile leaf springs, comprising a column one and a column two corresponding to the two ends of the leaf spring to be tested, a simulated bridge housing end installed in the middle of the leaf spring to be tested for simulating the end of the drive axle of an actual vehicle, an adjustment mechanism for adjusting the compression amount of the leaf spring to be tested, and a loading mechanism for simulating the torsional load on the leaf spring to be tested; both column one and column two are equipped with a clamp assembly for fixing one end of the leaf spring to be tested; the leaf spring is torsionally loaded by rotating the oil cylinder, and a telescopic transmission shaft is added between the oil cylinder and the leaf spring to simulate the actual vehicle condition, thereby testing the torsional fatigue performance of the leaf spring.

[0005] However, during the driving of the vehicle, not only the middle part of the leaf spring is loaded, but also the parts at both ends of the leaf spring connected to the vehicle body are loaded. Currently, there is no test device for performing torsional fatigue tests on both ends of the leaf spring. Therefore, it is impossible to fully reflect the fatigue performance of the leaf spring under the torsional load during driving, thereby reducing the accuracy of the torsional fatigue test of the leaf spring. Summary of the Invention

[0006] In order to improve the accuracy of leaf spring torsional fatigue testing, the present invention provides a basalt fiber leaf spring torsional fatigue testing device.

[0007] The basalt fiber leaf spring torsional fatigue test device provided in this application adopts the following technical solutions:

[0008] A basalt fiber leaf spring torsional fatigue test device 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. The side torsion mechanism acts on the lower side of the leaf spring assembly from bottom to top and is used to twist 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 load is applied to the middle part of the leaf spring assembly through the central load loader. While positioning the leaf spring assembly, the force applied to the leaf spring assembly during actual driving can be simulated. At the same time, the side torsion mechanism is activated to act on the lower side of the leaf spring assembly, driving the end of the leaf spring assembly to twist from bottom to top, so as to simulate the torsional load applied to the end of the leaf spring assembly during driving, so as to test the fatigue performance of the leaf spring assembly under the torsional load applied during driving, thereby improving the accuracy of the leaf spring torsional fatigue test.

[0010] Optionally, both ends of the leaf spring assembly are provided with lifting ears, and the test bench is provided with an assembly trolley corresponding to the lifting ears one by one. Two limit plates are relatively provided on the assembly trolley, and an installation groove is formed between the two limit plates on the same assembly trolley. The leaf spring assembly is passed through the installation groove, and a support rod is passed through the lifting ear. The two ends of the support rod are respectively installed on the two limit plates of the same assembly trolley.

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

[0012] Optionally, a support plate is provided on the side of the assembly trolley, 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 is extended out of the test bench, and the side torsion mechanism acts on the support plate, driving the support plate to rise from the bottom to the top, thereby achieving the effect of twisting the end of the leaf spring assembly to simulate the torsional load that the end of the leaf spring assembly is subjected to during driving.

[0014] Optionally, the side twisting mechanism includes:

[0015] A wheel disc, the wheel disc is located on the side of the support plate and is rotatably mounted on the test bench via a rotation axis, wherein the rotation axis is parallel to the support rod;

[0016] A cam, which is eccentrically arranged on the side of the wheel disc close to the assembly trolley and located below the support plate. When the cam rotates to the highest point along with the wheel disc, 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 rise;

[0017] A driving member is connected to the wheel disc and is used to drive the wheel disc to rotate.

[0018] By adopting the above technical solution, the driving part starts to drive the wheel to rotate, and the rotation of the wheel drives the cam to rotate. The cam rotates from under the support plate to against the support plate, and then the cam rotates and pushes the support plate to rise. As the wheel rotates, the cam causes the support plate to have a periodic lifting action to achieve continuous twisting of the end of the leaf spring assembly. The intensity of the twisting can be adjusted by changing the size of the cam, and the rotation speed of the wheel can be adjusted in conjunction with the driving part to adjust the twisting frequency, thereby improving the accuracy of the simulation of the torsional load received by the leaf spring assembly during driving, thereby testing the fatigue performance of the torsional load received by the leaf spring assembly during driving, thereby improving the accuracy of the leaf spring torsional fatigue test.

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

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

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

[0022] Optionally, there are two wheel discs, both of which are rotatably arranged 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, and each wheel disc is eccentrically provided with a cam.

[0023] By adopting the above technical solution, the two wheels facilitate the simultaneous torsional fatigue test on both ends of the leaf spring assembly. After the single-side test is completed, the leaf spring assembly is reversed, and the two ends of the other side of the leaf spring assembly can be tested, thereby improving the convenience of the test.

[0024] Optionally, the driving wheel is located below the two wheel discs, and the driving wheel and the two wheel discs are connected via the same transmission belt.

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

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

[0027] By adopting the above technical solution, the drive motor is directly connected to the rotating shaft, which means that the rotation speed of the wheel can be directly adjusted to simulate different torsional frequencies, thereby improving the convenience of the test.

[0028] Optionally, the side twisting mechanism includes:

[0029] A wedge block is provided on the test bench so as to slide 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 arranged at the highest point of the wedge block. When the pulley moves with the wedge block to the bottom of 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 drive the support plate to rise;

[0031] A linear reciprocating driver is provided on the test bench and has a driving end connected to an end of the wedge block away from the support plate. The linear reciprocating driver 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 drive drives the wedge block to move toward the support plate, and the movement of the wedge block drives the pulley to move. The pulley first contacts the support plate, and then the pulley pushes the support plate to lift. With the reciprocating drive of the linear reciprocating drive, the support plate has a periodic lifting effect to achieve continuous twisting of 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 drive can adjust the torsion frequency, thereby improving the accuracy of the simulation of the torsional load suffered by the leaf spring assembly during driving, thereby testing the fatigue performance of the torsional load suffered by the leaf spring assembly during driving, thereby improving the accuracy of the 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 central load loader. During the test, the central load loader applies a load to the middle part of the leaf spring assembly. While positioning the leaf spring assembly, the force applied to the leaf spring assembly during actual driving can be simulated. At the same time, the side torsion mechanism is activated to act on the lower side of the leaf spring assembly, driving the end of the leaf spring assembly to twist from bottom to top to simulate the torsional load on the end of the leaf spring assembly during driving. This is to test the fatigue performance of the leaf spring assembly under the torsional load during driving, thereby improving the accuracy of the leaf spring torsional fatigue test.

[0035] 2. The driving part starts to drive the wheel to rotate, and the rotation of the wheel drives the cam to rotate. The cam rotates from the bottom of the support plate to the support plate, and then the cam rotates and pushes the support plate to rise. As the wheel rotates, the cam causes the support plate to have a periodic lifting action, which has achieved continuous twisting of the end of the leaf spring assembly. The torsion intensity can be adjusted by changing the size of the cam, and the rotation speed of the wheel can be adjusted in conjunction with the driving part to adjust the torsion frequency, thereby improving the accuracy of the simulation of the torsional load on the leaf spring assembly during driving, thereby testing the fatigue performance of the torsional load on the leaf spring assembly during driving, thereby improving the accuracy of the leaf spring torsional fatigue test.

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

[0037] 4. Through the cooperation of the linear reciprocating drive, pulley and wedge block, the pulley has a periodic lifting effect on the support plate when it moves, so as to achieve continuous twisting of 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 drive can adjust the torsion frequency, thereby improving the convenience of torsional fatigue testing of basalt fiber leaf springs. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0039] Figure 2 : is a schematic diagram of the overall structure of Example 1 of the present 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 rotation of the wheel;

[0040] Figure 3 1 is a side view of the overall structure of Examples 1-4 of the present 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 rotation of the wheel;

[0041] Figure 4 1 is a side view of the overall structure of Example 5 of the present 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 rotation of the wheel;

[0042] Figure 5 is a schematic diagram of the overall structure of Example 6 of the present 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 Example 6 of the present application.

[0044] Figure numerals: 1. leaf spring assembly; 11. lifting ear; 2. test bench; 21. assembly trolley; 22. limit plate; 221. mounting groove; 23. support rod; 24. support plate; 25. fixing frame; 26. support platform; 3. central load loader; 4. side torsion mechanism; 41. wheel disc; 411. rotating shaft; 412. mounting shaft; 42. cam; 43. driving member; 431. driving wheel; 432. transmission belt; 433. driving motor; 44. wedge block; 441. rotating groove; 442. rotating shaft; 45. pulley; 46. linear reciprocating drive; 47. connecting plate. DETAILED DESCRIPTION

[0045] The following is combined with Figure 1-6 This application is described in further detail.

[0046] Reference Figure 1 The present invention discloses a basalt fiber leaf spring torsional fatigue test device. The leaf spring assembly 1 mentioned in all the embodiments of the present invention is a whole composed of a plurality of leaf springs of different lengths made of basalt fiber.

[0047] Example 1

[0048] Reference Figure 1 、 Figure 2 and Figure 3 A basalt fiber leaf spring torsional fatigue test device includes a test bench 2, a central load loader 3 and a side torsion mechanism 4 arranged above the test bench 2. The central load loader 3 is connected to the middle part 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 twist the end of the leaf spring assembly 1.

[0049] Reference Figure 1 、 Figure 2 and Figure 3 The middle part of the leaf spring assembly 1 is fixedly connected to the central load loader 3 by bolts, nuts and other structures. The central load loader 3 can use the hydraulic loading or electric loading system in the existing technology 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 twisted, but also can simulate 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 ears 11, and the test bench 2 is provided with an assembly trolley 21 corresponding to the lifting ears 11 one by one, and two limit plates 22 are provided on the upper surface of the assembly trolley 21. A mounting groove 221 is formed between the two limit plates 22 on the same assembly trolley 21, and the length direction of the mounting groove 221 is consistent with the length direction of the leaf spring assembly 1, and the leaf spring assembly 1 is penetrated into the mounting groove 221. The lifting ear 11 has a hole that passes through the two side walls of the lifting ear 11, and the axial extension direction of the hole is perpendicular to the length extension direction of the leaf spring assembly 1. A support rod 23 is penetrated in the hole, and the two limit plates 22 have a through hole that is consistent with the axial direction of the support rod 23. Both ends of the support rod 23 pass through the two through holes respectively, and both ends of the support rod 23 are threadedly connected with positioning nuts (not shown in the figure).

[0051] Reference Figure 1 、 Figure 2 and Figure 3 During installation, pass the end of the leaf spring assembly 1 into the installation groove 221, pass the support rod 23 through the first through-hole and the ear 11 in sequence, and then pass it out from the other through-hole. Finally, tighten the positioning nuts 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 installation groove 221, thereby realizing the detachable connection between the leaf spring assembly 1 and the assembly trolley 21, and the same applies to the other side.

[0052] Reference Figure 1 、 Figure 2 and Figure 3 The sides of the two assembly carts 21 are both provided with support plates 24 , which extend horizontally and extend out of the test bench 2 , and the side torsion mechanism 4 acts on the support plates 24 .

[0053] Reference Figure 2 and Figure 3 The side torsion mechanism 4 includes a wheel disc 41, a cam 42 and a driving member 43. There are two wheel discs 41. Both wheel discs 41 are rotatably arranged 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 wheel discs 41 are respectively located on the sides of the corresponding support plates 24. The following is only described by taking one wheel disc 41 as an example. The wheel disc 41 is rotatably arranged on the test bench 2 through a rotating shaft 411. The rotating shaft 411 is rotatably arranged on the lower surface of the test bench 2 and is parallel to the support rod 23. The wheel disc 41 is coaxially fixed to the end of the rotating shaft 411 away from the test bench 2. The distance between the wheel disc 41 and the side of the test bench 2 is greater than the distance between the support plate 24 and the test bench 2.

[0054] Reference Figure 2 and Figure 3There are two cams 42 and they correspond one to one with the wheel disc 41. The following is explained by taking only one cam 42 as an example. The cam 42 is eccentrically arranged on the side of the wheel disc 41 close to the assembly trolley 21 and is located below the support plate 24. The wheel disc 41 is provided with 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 a nut (not shown in the figure) for positioning the cam 42 is threadedly connected to the mounting shaft 412 on the mounting shaft 412. After installation, the nut is tightened on the cam 42 to fix the cam 42; when the cam 42 rotates to the highest point with the wheel disc 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 lifting the support plate 24.

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

[0056] Reference Figure 1 、 Figure 2 and Figure 3 Before the test, first connect the two assembly carts 21 to the lifting ears 11, then connect the leaf spring assembly 1 to the central load loader 3, apply load to the middle part of the leaf spring assembly 1 through the central load loader 3, and then install the cam 42 required for the test so that the cam 42 is fixed on the mounting shaft 412.

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

[0058] The working principle of Example 1 of the present application is:

[0059] Through the periodic rotation of the wheel disc 41, the support plate 24 has a periodic lifting action to achieve a continuous twisting effect on the end of the basalt fiber leaf spring. By replacing the cam 42 with different diameters, the lifting height of the leaf spring assembly 1 can be changed, thereby achieving a change in the torsional strength. By adjusting the rotation speed of the driving wheel 431 by the motor, the torsional frequency can be changed, and the two ends on the same side of the leaf spring assembly 1 can be tested at one time. After the test on the same side is completed, the leaf spring assembly 1 is disassembled and reversibly installed, so that the two ends on the other side of the leaf spring assembly 1 can be tested, thereby improving the accuracy of the simulation of the torsional load to which the leaf spring assembly 1 is subjected during driving, thereby testing the fatigue performance of the torsional load to which the leaf spring assembly 1 is subjected during driving, and improving the accuracy of the leaf spring torsional fatigue test.

[0060] Example 2

[0061] Reference Figure 3 , a basalt fiber leaf spring torsional fatigue test device, which is different from Example 1 in that, in this embodiment, the cam 42 is rotatably arranged on the mounting shaft 412, and the mounting shaft 412 is threadedly connected with a nut (not shown in the figure) to prevent the cam 42 from sliding out of the mounting shaft 412. When the cam 42 is fixed on the mounting shaft 412, as the wheel 41 rotates, the cam 42 is squeezed and subjected to friction from the support plate 24, and will tend to rotate itself. It is set to rotate in order to reduce friction and thus reduce wear.

[0062] The working principles of this embodiment are basically the same as those of embodiment 1, and will not be described again here.

[0063] Example 3

[0064] Reference Figure 2A basalt fiber leaf spring torsional fatigue test device is different from Example 1 in that, in this embodiment, a transmission chain is used instead of the transmission belt 432, and the driving wheel 431 and the wheel disc 41 both use sprockets.

[0065] The working principles of this embodiment are basically the same as those of embodiment 1, and will not be described again here.

[0066] Example 4

[0067] Reference Figure 3 A basalt fiber leaf spring torsional fatigue test device is different from Example 1 in that, in this embodiment, only one wheel disc 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 separately, a total of four tests are required to expand the comprehensiveness of the test.

[0068] The working principles of this embodiment are basically the same as those of embodiment 1, and will not be described again here.

[0069] Example 5

[0070] Reference Figure 3 and Figure 4 A basalt fiber leaf spring torsional fatigue test device is different from Example 1 in that, in this embodiment, the driving member 43 is a driving motor 433, two driving motors 433 are provided and correspond one to one with the wheel disc 41, a support platform 26 is provided on the side of the test bench 2, and the two driving motors 433 are fixed on the support platform 26, and 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, except that in this embodiment, the rotation speeds of the two wheels 41 can be adjusted individually 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 basalt fiber leaf spring torsional fatigue test device is different from Example 1 in that, in this embodiment, two side torsion mechanisms 4 are provided and correspond one-to-one to the support plates 24, and the support plates 24 are located above the test bench 2. The following description only takes 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 drive 46. The wedge block 44 is arranged on the test bench 2 and slides in 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 under the support plate 24. In this embodiment, the wedge block 44 adopts a triangular wedge block 44. In other feasible embodiments, the wedge block 44 can also be an ordinary wedge block 44, and the lower end of the wedge block 44 faces the support plate 24, and the higher end is away from the support plate 24.

[0075] Reference Figure 5 and Figure 6 The pulley 45 is rotatably arranged at the highest point of the wedge block 44. When the pulley 45 moves with the wedge block 44 to the bottom of 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 rise. The pulley 45 is detachable and arranged 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 concave arc-shaped rotation groove 441. A rotating shaft 442 is horizontally inserted into the rotation 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 outside the two opposite walls of the top of the wedge block 44. The pulley 45 is coaxially sleeved on the rotating shaft 442 and can rotate about the axis of the rotating shaft 442. The lower half of the pulley 45 is located in the rotation 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 threadedly connected to the positioning blocks (not shown in the figure) for positioning the rotating shaft 442. After positioning, the positioning blocks abut against the outer wall of the wedge block 44. In other feasible embodiments, the detachable connection method is not limited.

[0077] Reference Figure 5 and Figure 6 The linear reciprocating drive 46 is arranged on the test bench 2 and the driving end is connected to the end of the wedge block 44 away from the support plate 24. The linear reciprocating drive 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 drive 46 uses a pneumatic hydraulic cylinder in the prior art. The pneumatic hydraulic cylinder is detachably arranged on the test bench 2 by bolts. The driving end is a 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, and 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 both sides of both ends of the leaf spring assembly 1 need to be tested separately, a total of four tests are required to expand the comprehensiveness of the test.

[0079] The working principle of Example 6 of the present application is as follows:

[0080] The linear reciprocating drive 46 drives the wedge block 44 to move toward the support plate 24. The movement of the wedge block 44 drives the pulley 45 to move. The pulley 45 first contacts the support plate 24, and then the pulley 45 pushes the support plate 24 to rise. With the reciprocating drive of the linear reciprocating drive 46, the support plate 24 has a periodic lifting effect to achieve continuous twisting of the end of the leaf spring assembly 1. Changing the diameter of the pulley 45 can adjust the torsion amplitude, and adjusting the reciprocating drive frequency of the linear reciprocating drive 46 can adjust the torsion frequency. Setting two linear The reciprocating driver 46 can test both ends of the same side of the leaf spring assembly 1 at one time. After the test on the same side is completed, the leaf spring assembly 1 is disassembled and reversibly installed 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 driver 46 can be adjusted according to the test requirements, so as to improve the comprehensiveness of the simulation of the torsional load to which the leaf spring assembly 1 is subjected during driving, thereby testing the fatigue performance of the torsional load to which the leaf spring assembly 1 is subjected during driving and improving the accuracy of the leaf spring torsional fatigue test.

[0081] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A basalt fiber leaf spring torsional fatigue test device, characterized by: The invention comprises a test bench (2), a central load loader (3) arranged above the test bench (2), and a side torsion mechanism (4), wherein 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 twist the end of the leaf spring assembly (1).

2. The basalt fiber leaf spring torsional fatigue test device according to claim 1, characterized in that: Both ends of the leaf spring assembly (1) are provided with lifting ears (11), and the test bench (2) is provided with an assembly trolley (21) corresponding to the lifting ears (11). Two limiting plates (22) are relatively provided on the assembly trolley (21), and an installation groove (221) is formed between the two limiting plates (22) located on the same assembly trolley (21). The leaf spring assembly (1) is inserted into the installation groove (221), and a support rod (23) is inserted into the lifting ear (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 basalt fiber leaf spring torsional fatigue test device according to claim 2, characterized in that: A support plate (24) is provided on the side of the assembly trolley (21), the support plate (24) extends horizontally and extends out of the test bench (2), and the side twisting mechanism (4) acts on the support plate (24).

4. The basalt fiber leaf spring torsional fatigue test device according to claim 3, characterized in that: The side twisting mechanism (4) comprises: A wheel disc (41), the wheel disc (41) is located on the side of the support plate (24) and is rotatably mounted on the test bench (2) via a rotation axis (411), wherein the rotation axis (411) is parallel to the support rod (23); A cam (42) is eccentrically arranged on a side of the wheel disc (41) close to the assembly trolley (21) and below the support plate (24). When the cam (42) rotates to the highest point along with the wheel disc (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 driving member (43) is connected to the wheel disc (41) and is used to drive the wheel disc (41) to rotate.

5. The basalt fiber leaf spring torsional fatigue test device according to claim 4, characterized in that: The wheel disc (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 basalt fiber leaf spring torsional fatigue test device according to claim 4, characterized in that: The driving member (43) includes a driving wheel (431) and a transmission belt (432). The driving wheel (431) is driven to rotate by a motor, and the transmission belt (432) is sleeved on the driving wheel (431) and the wheel disc (41).

7. The basalt fiber leaf spring torsional fatigue test device according to claim 6, characterized in that: There are two wheel discs (41), both of which are rotatably arranged 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). A cam (42) is eccentrically arranged on each wheel disc (41).

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

9. The basalt fiber leaf spring torsional fatigue test device according to claim 4, characterized in that: The driving member (43) is a driving motor (433), and the output end of the driving motor (433) is in transmission connection with the rotating shaft (411).

10. The basalt fiber leaf spring torsional fatigue test device according to claim 3, characterized in that: The side twisting mechanism (4) comprises: a wedge-shaped block (44), the wedge-shaped block (44) being arranged on the test bench (2) so as to slide in a direction approaching or away from the support plate (24); during a test, the wedge-shaped block (44) slides and extends below the support plate (24); A pulley (45) is rotatably arranged at the highest point of the wedge block (44). When the pulley (45) moves with the wedge block (44) to the bottom of 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 rise. A linear reciprocating drive (46) is provided on the test bench (2) and has a driving end connected to an end of the wedge block (44) away from the support plate (24). The linear reciprocating drive (46) is used to drive the wedge block (44) to slide toward or away from the support plate (24).

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