A high-frequency torsional fatigue test bench and amplitude adjustment method of torsional tooling thereof

Abstract

The present invention relates to the technical field of fatigue testing of rubber products, and specifically to a high-frequency torsional fatigue testing platform, comprising an upper platform and a lower platform; the upper platform is provided with a movable loading assembly, the loading assembly comprising a torsion fixture for placing a rubber product and torsionally loading the rubber product, and a movable supporting fixture for supporting the rubber product is provided on the outer side of the torsion fixture; the lower platform is provided with a movable driving assembly comprising a driving motor; a swinging assembly is connected between the loading assembly and the driving assembly. The present invention can adjust the amplitude of the torsion fixture by cooperating with the driving assembly, the loading assembly, and the swinging assembly, and can perform high-frequency torsion testing on rubber products by motor drive. The present invention also discloses a method for adjusting the amplitude of the torsion fixture of a high-frequency torsional fatigue testing platform.

Description

Technical Field

[0001] The invention relates to a high-frequency torsional fatigue test bench and an amplitude adjustment method of a torsional tooling thereof, belonging to the technical field of fatigue testing of rubber products. Background Art

[0002] Fatigue test benches are usually equipment used to test fatigue mechanical properties, and can be used to test the fatigue characteristics and fatigue life of products such as metals, alloy materials and rubber products. Among them, rubber products are mostly formed by a metal-rubber-metal composite structure, which can withstand traction, suspension, vibration isolation, and buffering. They are widely used in the vibration reduction systems of rail transit, high-speed vehicles, automobiles, ships or aircraft. When the body is subjected to complex load conditions such as radial, torsion and deflection, the deformation of the rubber products is used to withstand the deflection angle and radial load, preventing the body from rolling over during operation and improving the riding comfort of the driver and passengers. When designing and developing rubber products, in order to ensure the stability of the vehicle body operation, it is usually necessary to use fatigue testing equipment to test the torsional fatigue performance of rubber products. In the prior art, the following test equipment involves torsional fatigue performance testing of mechanical products including rubber products:

[0003] 1. The invention patent application with publication number "CN112014087A" and patent name "A three-axis fatigue test device for rubber nodes based on tie rods" specifically includes a vertical loading device, an angle adjustment device, a lateral loading device, a longitudinal biasing device and a tie rod device. The tie rod device includes an upper connecting device, a lower connecting device and a tie rod with ball joints installed at both ends. By adopting a tie rod solution, this invention can simultaneously realize radial, deflection and torsional fatigue tests on rubber ball joints. It can perform tests on two ball joints at the same time, which can improve test efficiency and reliability and avoid test discreteness and errors caused by individual differences in ball joints. However, this patent has the following shortcomings:

[0004] 1) The patent uses a hydraulic cylinder to perform the torsion test on the rubber ball joint. In actual engineering practice, due to the large loading displacement, the loading frequency of the torsion condition generally does not exceed 5Hz. However, some products require a loading frequency of more than 10Hz, which is difficult to achieve using hydraulic cylinder loading.

[0005] 2) Although the patent involves an amplitude adjustment device, namely the angle adjustment device referred to in the specification, specifically a first angle adjustment plate, a second angle adjustment plate and an angle detection device, the angle adjustment device has a relatively complex structure and a limited adjustable angle range.

[0006] 2. The invention patent with the publication number "CN109406124A" and the patent name "A Leaf Spring Torsion Test and Detection Equipment" comprises a base, a leaf spring fixing mechanism arranged on the base, and a driving mechanism for driving the leaf spring to move. The leaf spring fixing mechanism comprises a leaf spring fixing seat and a leaf spring mounting seat relatively arranged at both ends of the base. A rectangular fixing hole A is provided on the leaf spring fixing seat along the length direction of the base. The leaf spring mounting seat comprises a mounting seat A and a mounting seat B relatively spaced apart. Mounting holes are correspondingly provided on mounting seats A and B. A torsion shaft is provided in the mounting holes of mounting seats A and B. A rectangular fixing hole B is provided on the torsion shaft along its axial direction. The rectangular fixing hole B is arranged relative to the rectangular fixing hole A and is located on the same axis. A connecting rod is fixedly connected to the torsion shaft. The invention has a simple and compact structure. The motor can drive the connecting rod mechanism to swing, thereby driving the leaf spring to rotate back and forth, thereby realizing torsional fatigue testing of the leaf spring. The structure is simple and easy to operate. However, this patent still has the following shortcomings:

[0007] 1) Although the testing equipment in this patent is driven by a motor instead of the hydraulic cylinder used in Prior Art 1, which can achieve a higher loading frequency to a certain extent, this testing equipment is designed to perform torsional fatigue testing on leaf springs and does not involve fatigue testing on rubber products. Whether it can perform high-frequency torsional fatigue testing on rubber products remains to be determined;

[0008] 2) The distance between the motor and the flywheel in this patent is not adjustable, nor is the overall position of the motor and flywheel. The applicable test conditions are limited, and the patent is not universal.

[0009] 3) Although the patent specification states that "the reciprocating rotation angle of the torsion shaft can be adjusted according to the connection position and size of the flywheel, rocker arm, and connecting rod to achieve control of the torsion angle of the leaf spring. In this solution, the torsional swing angle is ±35°," it does not disclose the connection position of the flywheel, rocker arm, and connecting rod, nor the method for adjusting the angle. Moreover, the torsional swing angle specified in the patent as ±35° is too narrow an adjustable range.

[0010] In summary, how to design a fatigue testing device that can perform high-frequency torsion tests on rubber products through motor drive, and at the same time adjust the amplitude of the torsion tooling according to actual working conditions, and has a large amplitude adjustment range, is a problem that needs to be solved urgently. Summary of the Invention

[0011] The high-frequency torsional fatigue test bench provided by the present invention can adjust the amplitude of the torsion fixture according to actual working conditions through the coordination of a drive assembly, a loading assembly, and an oscillating assembly. This wide amplitude adjustment range allows for high-frequency torsion testing of rubber products through motor drive. The present invention also provides a method for adjusting the amplitude of the torsion fixture of the high-frequency torsional fatigue bench.

[0012] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a high-frequency torsional fatigue test bench, comprising an upper platform and a lower platform; a movable loading assembly is provided on the upper platform, the loading assembly includes a torsion tooling for placing a rubber product and torsionally loading the rubber product, and a movable supporting tooling for supporting the rubber product is provided on the outside of the torsion tooling; a movable driving assembly including a driving motor is provided on the lower platform; a swinging assembly is connected between the loading assembly and the driving assembly, and can cooperate with the driving assembly and the loading assembly to adjust the torsional amplitude of the torsion tooling.

[0013] Preferably, the loading assembly includes a fixed platform slidably arranged on the upper platform, and the torsion tool is movably connected to the inner side of the upper part of the fixed platform through torsion shaft 1 and torsion shaft 2; the rubber product is fixedly placed on the torsion tool.

[0014] Preferably, the supporting tooling includes a supporting seat and a supporting rod provided at the upper end of the supporting seat; the supporting seat is slidably provided on the upper platform, and the supporting rod is fixedly connected to the rubber product on the torsion platform.

[0015] Preferably, the drive assembly includes a drive plate movably arranged on the lower platform and a drive disk arranged on the outside of the drive plate, the drive motor is arranged on the drive plate and fixedly connected to the drive disk through a drive shaft; an adjustment groove is radially provided on the side of the drive disk away from the drive shaft.

[0016] Preferably, the swing assembly includes a connecting rod 1 connected to the driving disk and a connecting rod 2 connected to the torsion shaft 1; the end of the connecting rod 1 away from the driving disk and the end of the connecting rod 2 away from the torsion shaft 1 are rotatably connected, and the connecting rod 2 is provided with an adjustment groove 2; a connecting block 1 is provided between the connecting rod 1 and the driving disk, and the connecting block 1 can slide in the adjustment groove 1; a connecting block 2 is provided between the connecting rod 1 and the connecting rod 2, and the connecting block 2 can slide in the adjustment groove 2; a connecting block 3 is provided between the torsion shaft and the connecting rod 2, and the connecting block 3 can slide in the adjustment groove 2.

[0017] A method for adjusting the amplitude of a torsional tooling of a high-frequency torsional fatigue test bench is disclosed. The method is used to adjust the torsional amplitude of the test bench drive tooling. Specifically, the method comprises adjusting the eccentricity L1 between connecting block 1 and the center point O of the driving disk and the distance L2 between connecting block 2 and connecting block 3, thereby adjusting the amplitude of the torsional tooling according to actual working conditions.

[0018] Preferably, the first principle for setting the adjustment amplitude is: the connecting block 1 is located in the middle of the adjustment slot 1 on one side of the center point O of the driving disk, so that the theoretical value of L1 can be determined; the second principle for setting the adjustment amplitude is: the adjustment slot 1 is in a vertical position perpendicular to the ground plane. At this time, the connecting block 2 and the center point O of the driving disk are located on the same vertical line, and the connecting rod 2 is at the highest point a or the lowest point b of the swing amplitude.

[0019] Preferably, the adjustment steps are as follows:

[0020] S1: Calculate the value of L2;

[0021] S2: Determine the position of the twisting tool according to L2, and move the twisting tool to the determined position;

[0022] S3: Attach the inclinometer to the second connecting rod. When the second connecting rod is parallel to the ground plane, the inclinometer displays 0°.

[0023] S4: Rotate the drive disc so that the adjustment slot 1 is in the vertical position. At this time, the inclinometer displays "+t°" or "-t°".

[0024] S5: Adjust the position of the connecting block 1 in the adjusting groove 1 so that t=e, and then lock the connecting block 1; wherein e is the target torsion angle value of the torsion tooling.

[0025] Preferably, the value of L2 is calculated in step S1, and the calculation steps are as follows:

[0026] S11: Let X be the distance between the highest point a and the lowest point b of the swing amplitude of connecting rod 2, and let L1 be the theoretical value, in which case X = 2*L1; let e be the angle between connecting rod 2 and the horizontal line L3, and let the swing amplitude of connecting rod 2 be "+e°" or "-e°"; L1 and e are both known, L1 is obtained by measurement, and e is the target torsion angle value required for the torsion tooling under actual working conditions;

[0027] S12: Calculate the value of L2 according to the trigonometric formula: Sin e=L1 / L2, that is, L2=L1 / Sin e.

[0028] Preferably, the step S5 of adjusting the position of the connecting block 1 in the adjusting groove 1 is as follows:

[0029] If the t value is less than the target angle value e, tap or push the connecting block 1 or rotate the driving disk to make the connecting block 1 slide in the adjustment slot 1 away from the center point O of the driving disk. Observe the reading of the inclinometer. When the connecting block 1 is in the appropriate position so that t=e, lock the connecting block 1.

[0030] If the t value is greater than the target angle value, knock or push the connecting block 1 or rotate the driving disk to make the connecting block 1 slide in the adjusting slot 1 toward the center point O of the driving disk. Observe the indication of the inclinometer. When the connecting block 1 is in the appropriate position so that t=e, lock the connecting block 1.

[0031] The beneficial effects of the invention are:

[0032] 1. The present invention can adjust the amplitude of the torsion tooling and rubber products by cooperating with the driving assembly, the loading assembly and the swing assembly, and the amplitude adjustment range is large, specifically:

[0033] 1) The drive assembly can slide on the lower platform as a whole to adjust the overall position of the drive assembly;

[0034] 2) The driving disc in the driving assembly is provided with an adjustment slot 1, and the connecting rod 1 in the swing assembly can slide on the driving disc through the adjustment slot 1 to adjust its position;

[0035] 3) Connecting rod 2 is provided with a second adjustment slot. The torsion tooling is slid as a whole on the upper platform so that the torsion shaft 1 slides in the second adjustment slot to adjust the position between the torsion shaft 1 and connecting rod 2.

[0036] 4) Under certain working conditions, according to actual needs, the connecting rod 1 can also be slid in the adjusting groove 2 to adjust the position between the connecting rod 1 and the connecting rod 2.

[0037] 2. The test bench of the present invention is driven by a driving motor to perform fatigue tests on rubber products. The driving motor can control the rotation speed. By adjusting the torsional frequency of the driving disc by the driving motor, a loading frequency of more than 10 Hz can be achieved.

[0038] 3. The present invention drives the driving disc to rotate by a driving motor, drives the swing assembly to swing according to a preset swing angle, and then drives the torsion tooling to twist through the torsion shaft, thereby realizing a torsional fatigue test of the rubber product on the torsion tooling.

[0039] 4. The amplitude adjustment method of the present invention first sets the eccentricity L1 between connecting block 1 and the center point O of the driving disk to a theoretical value, that is, the value when connecting block 1 is located in the middle of adjustment slot 1 to one side of the driving disk center point O. Then, connecting rod 1, adjustment slot 1, and the center point O of the driving disk are set on the same vertical line, and connecting rod 2 is located at the highest point a or the lowest point b of the swing amplitude. Then, the distance L2 between connecting block 2 and connecting block 3 is calculated according to the formula. Then, based on the inclinometer reading, connecting block 1 is adjusted to the appropriate position within adjustment slot 1 so that the inclinometer indicates an angle t = e, where e is the target torsion angle of the torsion tool. This adjustment method is simple to operate, has a wide amplitude adjustment range, and is highly versatile. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Schematic diagram of the overall structure of the test bench in Example 1.

[0041] Figure 2 This is a top view of the test bench in Example 1.

[0042] Figure 3 This is a front view of the test bench in Example 1.

[0043] Figure 4 This is a structural diagram of the fixed platform, torsion tooling and rubber product in Example 1.

[0044] Figure 5 Schematic diagram of amplitude adjustment in Example 2 Figure 1 (At this time, the connecting block 1 is located on the right side of the center point O of the drive shaft).

[0045] Figure 6 Schematic diagram of amplitude adjustment in Example 2 Figure 2 (At this time, the connecting block 1 is located on the left side of the center point O of the drive shaft).

[0046] Figure 7 Schematic diagram of amplitude adjustment in Example 2 Figure 2 (At this time, the connecting rod 1, the center point O of the driving shaft and the adjusting slot 1 are on the same vertical line).

[0047] The accompanying drawings include: upper platform 1, lower platform 2, support column 3, torsion tooling 4, rubber product 5, fixed platform 6, bottom support 7, side support one 8, side support two 9, connecting hole one 10, lower plate 11, upper plate one 12, upper plate two 13, support plate 14, torsion shaft one 15, rubber body 16, metal body one 17, metal body two 18, support seat 19, support rod 20, weight-reducing through hole 21, adjustment groove 22, drive plate 23, drive motor 24, drive shaft 26, bearing seat 27, horizontal slide groove 28, drive disk 29, adjustment groove one 30, support frame one 31, adjustment hole 32, connecting rod one 33, connecting rod two 34, connecting block one 35, adjustment groove two 36, connecting block two 37, connecting block three 38. DETAILED DESCRIPTION

[0048] The following is combined with Figure 1-7 The embodiments of the present invention are described in detail: Figure 2 The direction shown by M in the middle is the longitudinal direction. Figure 2 The direction indicated by N is the direction perpendicular to the ground plane.

[0049] Example 1

[0050] A high frequency torsional fatigue test bench, such as Figure 1 As shown, the test apparatus comprises an upper platform 1 and a lower platform 2, which are supported by support columns 3. The upper platform 1 is located at the upper end of the support columns 3, while the lower platform 2 is located between the support columns 3 and below the upper platform 1. A movable loading assembly is mounted on the upper platform 1, which includes a torsion fixture 4. During fatigue testing, a rubber product 5 is placed on the torsion fixture 4 for torsion loading. A movable support fixture is installed outside the loading assembly to support the rubber product 5. A drive assembly is mounted on the lower platform 2, with a swing assembly connected between the loading and drive assemblies.

[0051] The loading assembly includes a fixed platform 6, such as Figure 4As shown, the fixed platform 6 includes a bottom support 7 slidably connected to the upper platform 1, and two side supports are provided on both sides of the upper end surface of the bottom support 7 in the horizontal direction. The two side supports are respectively side support 1 8 and side support 2 9. The upper parts of side support 1 8 and side support 2 9 are respectively provided with connecting hole 10 and connecting hole 2.

[0052] like Figure 1 As shown, the twisting tool 4 is located above the bottom support 7 and is arranged between the side support 1 8 and the side support 2 9. Figure 4 As shown, the torsion tooling 4 includes a lower plate 11 and an upper plate 12 located on the upper end of the lower plate 11 near the side support 1 8. An upper plate 2 13 is provided on the other side of the upper end of the lower plate 11 relative to the upper plate 12, and the upper plate 2 13 is arranged near the side support 2 9; a torsion shaft 15 and a torsion shaft 2 are respectively provided on the upper plate 12 and the upper plate 2 13, and the torsion tooling 4 is movably connected to the inner side of the upper part of the fixed platform 6 through the torsion shaft 15 and the torsion shaft 2; wherein the torsion shaft 2 passes through the connecting hole 2 and is connected to other supporting components, and a bearing 2 connected to the torsion shaft 2 is provided in the connecting hole 2.

[0053] like Figure 4 As shown, the rubber product 5 in this embodiment includes a metal body 17 located at the bottom, a metal body 2 18 located at the top, and a rubber body 16 vulcanized between the metal bodies 17 and 18. The metal body 17 is fixedly connected to the lower plate 11 so that the rubber body 16 and the metal body 17 can be twisted along with the lower plate 11 to perform fatigue testing.

[0054] like Figure 1 As shown, the support fixture includes a support seat 19 and a support rod 20 provided at the upper end of the support seat 19; the support seat 19 is slidably provided on the upper platform 1, and the support rod 20 is fixedly connected to the metal body 18 of the rubber product 5 to limit the position of the rubber product 5, thereby supporting the rubber product 5 and assisting in the torsional loading. Figure 4 As shown, the upper plate 12 and the upper plate 2 13 are connected to the other side away from the support seat 19 with a support plate 14; the support plate 14 is at 90° to the upper plate 12 and the upper plate 2 13 in the horizontal direction and in the vertical direction, one side end of the support plate 14 is fixedly connected to the upper plate 12, and the other side end of the support plate 14 is fixedly connected to the upper plate 2 13, so as to stably support the upper plate 12 and the upper plate 2 13, further improve the firmness of the overall connection of the torsion tooling, and increase the accuracy of fatigue detection.

[0055] The lower plate 11 is provided with a number of weight-reducing through-holes 21. These holes save material and reduce the overall weight of the torsion tooling 4, facilitating torsional motion. Furthermore, the holes 21 facilitate the installation of irregularly shaped rubber products 5 on the lower plate 11, further enhancing the versatility of the loading assembly. In this embodiment, four rectangular weight-reducing through-holes 21 are evenly distributed on the lower plate 11, and mounting holes for the rubber product 5 are also provided in the middle of the four weight-reducing through-holes 21. Those skilled in the art may also provide other numbers, shapes, and arrangements of weight-reducing through-holes 21 on the lower plate 11, depending on actual working conditions. Furthermore, the weight-reducing through-holes 21 may also serve as mounting holes for the irregularly shaped rubber product 5, if necessary.

[0056] like Figure 2 As shown, the upper platform 1 is provided with a plurality of adjustment slots 22 in the horizontal and vertical directions, and the lower ends of the bottom support 7 and the support seat 19 are provided with sliders matching the adjustment slots 22, so that the bottom support 7 and the support seat 19 can slide on the upper platform 1 through the sliders and the adjustment slots 22; those skilled in the art can move the fixing platform 6 and the support seat 19 as a whole on the upper platform 1 along the adjustment slots 22 according to the actual working conditions. Figure 2 When fatigue testing is performed on larger rubber products 5, the support seat 19 can be moved as a whole on the upper platform 1 toward Figure 2 The left side of the support rod 20 is moved to meet the space requirements of the large-sized rubber product 5, and then the free end of the support rod 20 is fixedly connected to the metal body 18 of the rubber product 5. Those skilled in the art can also move the support seat 19 as a whole on the loading platform along the adjustment slot 22 toward Figure 2 The bottom support 7 can be moved to the right, upper, or lower side of the bottom support 7 to secure rubber products 5 of different specifications and assist in completing fatigue testing. The lateral width of the bottom support 7 is 1 / 3-2 / 3 of the lateral width of the upper platform 1 to ensure sufficient loading space on the fixed platform 6 and sufficient movable adjustment space on the upper platform 1. In this embodiment, the lateral width of the bottom support 7 is 2 / 3 of the lateral width of the upper platform 1. The lateral width of the lower plate 11 is not less than 1 / 2 of the lateral width of the bottom support 7, so that the lower plate 11 can accommodate rubber products 5 of different specifications and sizes, enhancing the versatility of the loading assembly. In this embodiment, the lateral width of the lower plate 11 is 2 / 3 of the lateral width of the bottom support 7.

[0057] like Figure 1As shown, the drive assembly includes a drive plate 23 movably arranged on the lower platform 2, a drive motor 24 arranged at the upper end of the drive plate 23 and a drive disk 29 arranged on the outer side of the lower platform 2; a coupling is provided on the side of the drive motor 24 close to the drive disk 29, and a drive shaft 26 is fixed between the coupling and the drive disk 29. The coupling makes the drive motor 24 and the drive shaft 26 a flexible connection, which can improve the performance and service life of the drive motor 24; the drive disk 29 is driven by the drive motor 24 and rotates on the outer side of the lower platform 2; a transverse slide 28 is provided on the drive plate 23, and the drive motor 24 can move along A transverse slot 28 slides laterally on the drive plate 23. The drive shaft 26 is provided with at least one support bearing assembly, specifically two in this embodiment. The bearing seats 27 of the support bearing assemblies are connected to the drive plate 23 to support the drive shaft 26. The support bearing assemblies ensure alignment of the central axes of the drive motor 24, the drive shaft 26, and the drive disc 29, providing good support for the drive shaft 26. The transverse slot 28 allows adjustment of the position of the support bearing assembly on the drive plate 23, thereby also adjusting the position of the drive motor 24 on the drive plate 23. The drive motor 24 can control its rotational speed, thereby adjusting the torsional frequency of the drive disc 29, thereby achieving a loading frequency of 10 Hz or higher required for certain operating conditions.

[0058] like Figure 1 As shown, the lower platform 2 includes a longitudinal support frame 1 31 and a transverse support frame 2. The support frame 1 31 is evenly distributed along the longitudinal direction with a plurality of adjustment holes 32. The drive plate 23 is provided with a fixing member connected to the adjustment holes 32. The adjustment holes 32 are pin holes or threaded holes, and the fixing member is a fixing pin or fixing bolt that matches the adjustment holes 32. In this embodiment, the adjustment holes 32 are threaded holes, and the fixing member is a fixing bolt. The drive plate 23 can be installed at different adjustment holes 32 according to the processing requirements of different rubber products 5. This allows the installation position of the drive plate 23 in the longitudinal direction of the lower platform 2 to be adjusted, thereby adjusting the driving position of the drive assembly. The drive plate 29 is provided with an adjustment slot 1 30 in the radial direction on the side away from the drive shaft 26. The adjustment slot 1 30 is a T-shaped slot, and the center point O of the drive plate 29 is located in the middle of the adjustment slot 1 30.

[0059] like Figure 1 and Figure 3As shown, the swing assembly includes a connecting rod 1 33 connected to the drive plate 29 and a connecting rod 2 34 connected to the torsion shaft 15. The end of the connecting rod 1 33 away from the drive plate 29 is rotatably connected to the end of the connecting rod 2 34 away from the torsion shaft 15. The connecting rod 1 33 is provided with a T-shaped connecting block 1 35 that is slidably connected to the adjustment slot 1 30. The T-shaped connecting block 1 35 slides within the T-shaped adjustment slot 1 30 to adjust the position between the connecting rod 1 33 and the drive plate 29. The connecting rod 2 34 is provided with an adjustment slot 2 36. The end of the connecting rod 1 33 away from the drive plate 29 is provided with a connecting block 2 37 that slides within the adjustment slot 2 36. Under certain operating conditions, the position between the connecting rod 1 33 and the connecting rod 2 34 can be adjusted by the connecting block 2 37. The side of the connecting rod 2 34 opposite to the connecting rod 1 33 is connected to the torsion tooling 4 through the torsion shaft 15. The torsion shaft 15 is connected between the upper plate 12 and the connecting rod 2 34 through the connecting hole 10. A bearing 1 connected to the connecting hole 10 is provided in the connecting hole 10. The bearing 1 can provide good support for the torsion shaft 15 to carry the torsion tooling 4 to twist, thereby improving the service life of the components and improving the accuracy of the fatigue test. A connecting block 3 38 is provided on the torsion shaft 15. By sliding the fixed platform 6 on the upper platform 1, the connecting block 3 38 can slide in the adjusting slot 3 to adjust the position between the connecting rod 2 34 and the torsion shaft 15.

[0060] Implementation method:

[0061] The driving plate 23 is installed on the support frame 1 31 through the adjustment hole 32; the torsional amplitude required for the rubber product is obtained according to the actual working conditions, and the position between the connecting rod 1 33 and the driving disk 29 is adjusted by sliding the connecting block 1 35 in the adjustment groove 1 30, and the position between the torsion shaft 1 15 and the connecting rod 2 34 is adjusted by sliding the fixing table 6 on the upper platform 1 so that the connecting block 38 slides in the adjustment groove 2 36 to match the torsional amplitude required by the rubber product 5; the driving motor 24 is started, and the driving motor 24 drives the driving disk 29 to rotate, and the driving disk 29 drives the connecting rod 1 33 to rotate and swing, and the connecting rod 1 33 drives the connecting rod 2 34 to rotate and swing, and then the connecting rod 2 34 drives the torsion tooling 4 and the rubber product 5 through the torsion shaft 15 to load according to the required torsional amplitude, so as to perform a torsional fatigue test on the rubber product 5.

[0062] Example 2

[0063] A method for adjusting the amplitude of a torsion tooling of a high-frequency torsional fatigue test bench is used to adjust the torsion amplitude of the driving tooling 4 of the test bench and the rubber product 5 at its upper end in Example 1, such as Figure 1 As shown, by adjusting the eccentricity L1 between the connecting block 1 35 and the center point O of the driving disk 29 and the distance L2 between the connecting block 2 37 and the connecting block 3 38 , the torsional amplitude of the torsion tool 4 is adjusted according to the actual working conditions.

[0064] Adjusting the amplitude includes two setting principles:

[0065] Setting principle 1 is: the connecting block 35 is located in the middle of the adjustment slot 30 on one side of the center point O of the driving disk 29, so that when adjusting the position between the connecting rod 33 and the driving disk 29, the connecting block 35 has sufficient adjustment space on both the left and right sides of the adjustment slot 30; Figure 5 As shown, the connecting block 35 can be located on the right side of the center point of the driving disk 29, as shown in FIG. Figure 6 As shown, the connecting block 35 can also be located on the left side of the center point of the driving disk 29, so that the theoretical value of L1 can be determined;

[0066] The theoretical value of L1 is the value when the connecting block 35 is located in the middle of the left side or the middle of the right side of the center point O of the driving disk 29 in the adjustment slot 30. There is usually a certain deviation between the theoretical value of L1 and the actual value of L1. Therefore, it is necessary to adjust L1 from the theoretical value to the actual value according to the following adjustment steps.

[0067] The second setting principle is: Figure 7 As shown, when the adjustment slot 1 30 is in a vertical position perpendicular to the ground plane, the connecting block 2 37 and the center point O of the driving disk 29 are located on the same vertical line, and the connecting rod 2 34 is at the highest point a or the lowest point b of the swing amplitude. The highest point a and the lowest point b are symmetrical with respect to the center point O of the torsion disk, which can meet the general product requirements for torsional amplitude (torsion angle) symmetry.

[0068] The specific steps for adjusting the amplitude are as follows:

[0069] S1: Calculate the value of L2, specifically:

[0070] S11: Let X be the distance between the highest point a and the lowest point b of the swing amplitude of the second connecting rod 34, and let L1 be the theoretical value, in which case X=2*L1; let e be the angle between the second connecting rod 34 and the horizontal line L3, and let the swing amplitude of the second connecting rod 34 be "+e°" or "-e°"; where L1 and e are both known, L1 is the theoretical value when the connecting block 1 35 is located in the middle of one side of the center point O of the torsion axis, which can be obtained through measurement, and e is the target torsion angle value required for the torsion tooling 4 and the rubber product 5 under actual working conditions;

[0071] S12: Calculate L2 according to the trigonometric formula: Figure 7 As shown, Sin e=L1 / L2, that is, L2=L1 / Sin e.

[0072] S2: The second connector 37 is fixed, the position of the torsion fixture 4 is determined based on L2, and the fixed platform 6 is moved to drive the torsion fixture 4 to slide on the upper platform 1 to the determined position and fix the torsion fixture 4 on the upper platform 1. This step is a coarse adjustment, specifically, the fixed platform 6 is slid to make the third connector 38 slide in the second adjustment slot 36, thereby adjusting the position between the torsion shaft 15 and the second connecting rod 34 to meet the requirement of L2. Since the second connecting rod 34 is very long and has a large adjustment space, and the fixed platform 6 and the torsion fixture 4 are heavy, they are not suitable for precise adjustment. Therefore, the torsion fixture 4 is first placed on the upper platform 1 based on the L2 calculated above. At this time, the swing amplitude of the second connecting rod 34 is close to the target torsion angle value of the rubber product 5.

[0073] S3: Attach the inclinometer to the second connecting rod 34. When the second connecting rod 34 is parallel to the ground plane, that is, parallel to the horizontal line L3, the inclinometer displays 0°.

[0074] S4: Rotate the drive disc 29 so that the adjustment slot 1 30 is in the vertical position. At this time, the inclinometer displays "+t°" or "-t°".

[0075] S5: Adjust the position of connecting block 35 within adjusting slot 30 so that t = e, then tighten connecting block 35. This step primarily determines the actual value of L1 based on the target torsion angle e. This is performed by sliding connecting block 35 within adjusting slot 30. This step is fine-tuning. Connecting block 35 is small, lightweight, and easy to move, making it suitable for precise control.

[0076] If the value of t is less than the target angle value e, tap or push the connecting block 35 or rotate the driving disk 29 to make the connecting block 35 slide in the adjusting slot 30 away from the center point O of the driving disk 29. Observe the reading of the inclinometer. When the connecting block 35 is in the appropriate position so that t=e, lock the connecting block 35.

[0077] If the value of t is greater than the target angle value e, tap or push the connecting block 35 or rotate the driving disk 29 to make the connecting block 35 slide in the adjustment slot 30 toward the center point O of the driving disk 29. Observe the reading of the inclinometer. When the connecting block 35 is in the appropriate position so that t=e, lock the connecting block 35.

[0078] The distance between the connecting block 1 35 and the center point O of the driving disk 29 obtained above is the actual value of L1, and e is the target torsional amplitude value required by the rubber product 5. The amplitude adjustment of the torsional tooling 4 is completed, and the target torsional angle value required by the rubber product 5 is also adjusted.

[0079] The above are only embodiments of the present invention. The invention is not limited to the fields involved in this implementation case. Common knowledge such as the specific structure and characteristics of the scheme are not described in detail here. It should be pointed out that for those skilled in the art, without departing from the content of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for adjusting the amplitude of a torsion tooling of a high-frequency torsion fatigue test bench, characterized in that: The adjustment is performed by a high-frequency torsional fatigue test bench, which comprises an upper platform (1) and a lower platform (2); the upper platform (1) is provided with a movable loading assembly, the loading assembly comprising a torsion tool (4) for placing a rubber product (5) and carrying the rubber product (5) for torsion loading, and a movable supporting tool for supporting the rubber product (5) is provided on the outer side of the torsion tool (4); the lower platform (2) is provided with a movable driving assembly comprising a driving motor (24); a swinging assembly is connected between the loading assembly and the driving assembly and can cooperate with the driving assembly and the loading assembly to adjust the torsion amplitude of the torsion tool (4); the loading assembly comprises a sliding member provided on the upper platform (1) is provided with a fixed platform (6), the torsion tooling (4) is movably connected to the inner side of the upper part of the fixed platform (6) through a torsion shaft 1 (15) and a torsion shaft 2; the rubber product (5) is fixedly placed on the torsion tooling (4); the support tooling comprises a support seat (19) and a support rod (20) provided at the upper end of the support seat (19); the support seat (19) is slidably provided on the upper platform (1), the support rod (20) is fixedly connected to the rubber product (5) on the torsion tooling (4); the drive assembly comprises a drive plate (23) movably provided on the lower platform (2) and a drive disc (29) provided on the outer side of the drive plate (23); the drive motor (24) is provided on the drive plate (23) and is connected to the drive plate (23) by a screw thread. The drive shaft (26) is fixedly connected to the drive disk (29); an adjustment groove (30) is provided on the side of the drive disk (29) away from the drive shaft (26) in the radial direction; the swing assembly includes a connecting rod (33) connected to the drive disk (29) and a connecting rod (34) connected to the torsion shaft (15); the end of the connecting rod (33) away from the drive disk (29) and the end of the connecting rod (34) away from the torsion shaft (15) are rotatably connected, and the connecting rod (34) is provided with an adjustment groove (36); a connecting block (35) is provided between the connecting rod (33) and the drive disk (29), and the connecting block can slide in the adjustment groove (30); the connecting rod (33) and the connecting rod (34) are connected to each other. 34) is provided with a connecting block 2 (37), which can slide in the adjusting groove 2 (36); a connecting block 3 (38) is provided between the torsion shaft 1 (15) and the connecting rod 2 (34), which can slide in the adjusting groove 2 (36); by adjusting the eccentricity L1 between the connecting block 1 (35) and the center point O of the driving disk (29) and the distance L2 between the connecting block 2 (37) and the connecting block 3 (38), the amplitude of the torsion tool (4) is adjusted according to the actual working conditions; the setting principle of the amplitude adjustment is: the connecting block 1 (35) is located in the middle of the adjusting groove 1 (30) on one side of the center point O of the driving disk (29), so that the theoretical value of L1 can be determined;The second principle for setting the adjustment amplitude is: the adjustment slot 1 (30) is in a vertical position perpendicular to the ground plane, at this time, the connecting block 2 (37) and the center point O of the driving disk (29) are located on the same vertical line, and the connecting rod 2 (34) is at the highest point a or the lowest point b of the swing amplitude; The adjustment steps are as follows: S1: Calculate the value of L2; The value of L2 is calculated in step S1, and the calculation steps are as follows: S11: Let the distance between the highest point a and the lowest point b of the swing amplitude of the second connecting rod (34) be X, let L1 be the theoretical value, in this case X=2*L1; the angle between the second connecting rod (34) and the horizontal line L3 is e, and the swing amplitude of the second connecting rod (34) is "+e°" or "-e°"; wherein L1 and e are both known, L1 is obtained by measurement, and e is the target torsion angle value required by the torsion tooling (4) under actual working conditions; S12: Calculate the value of L2 according to the trigonometric formula: Sin e=L1 / L2, that is, L2=L1 / Sin e; S2: determining the position of the twisting tool (4) according to L2, and moving the twisting tool (4) to the determined position; S3: Attach the inclinometer to the second connecting rod (34). When the second connecting rod (34) is parallel to the ground plane, the inclinometer displays 0°. S4: Rotate the driving disc (29) so that the adjustment slot 1 (30) is located in the vertical position, and the inclinometer displays "+t°" or "-t°"; S5: Adjust the position of the connecting block 1 (35) in the adjusting groove 1 (30) so that t=e, and then lock the connecting block 1 (35); wherein e is the target torsion angle value of the torsion fixture (4).

2. The amplitude adjustment method of the torsion tooling of the high-frequency torsion fatigue test bench according to claim 1 is characterized in that: The position of the adjusting connecting block 1 (35) in the adjusting groove 1 (30) in step S5 is specifically as follows: If the t value is less than the target angle value e, knock or push the connecting block 1 (35) or rotate the driving disk (29) to make the connecting block 1 (35) slide in the adjusting groove 1 (30) away from the center point O of the driving disk (29), observe the value indicated by the inclinometer, and when the connecting block 1 (35) is in the appropriate position so that t=e, lock the connecting block 1 (35); If the t value is greater than the target angle value, knock or push the connecting block 1 (35) or rotate the driving disk (29) to make the connecting block 1 (35) slide in the adjusting groove 1 (30) toward the center point O of the driving disk (29), observe the indication of the inclinometer, and when the connecting block 1 (35) is in the appropriate position so that t=e, lock the connecting block 1 (35).

Images