Vibration test bench for shock absorber and testing method thereof

Abstract

The present application relates to a vibration test bench for a shock absorber and a testing method thereof, and relates to the technical field of vibration testing equipment; the vibration test bench comprises a base and a fixing frame arranged on the base, a fixing assembly for fixing a workpiece to be tested is arranged between the base and the fixing frame; a frame is arranged on a side of the fixing frame away from the base, a clamping assembly for clamping a test end of the workpiece to be tested is arranged on the frame, and a lifting member is arranged on the frame for driving the clamping assembly to perform high-frequency lifting and lowering movements; the present application has the effect of improving the testing accuracy of the test bench.

Description

Technical Field

[0001] The present application relates to the technical field of vibration testing equipment, and in particular to a vibration testing table for a shock absorber and a testing method thereof. Background Art

[0002] As a core component of a vehicle's suspension system, the performance of the shock absorber directly impacts ride comfort and safety. Vibration testing is a crucial method for evaluating the dynamic characteristics of shock absorbers. To address the varying bumps and jolts of different road surfaces, the industry currently utilizes vibration test benches to simulate actual operating conditions.

[0003] In the related art, a vibration test bench includes a frame and a fixture arranged on the frame, the fixture is used to clamp the piston rod of the top cylinder body of the workpiece to be tested, a fixing structure for fixing the workpiece to be tested is installed on the frame, and a high-frequency electric cylinder is provided on the frame. The output end of the high-frequency electric cylinder is fixedly connected to the fixture, and the high-frequency electric cylinder applies a moving force to the fixture and the piston rod to drive the fixture to drive the piston rod to move at high frequency along the extension and contraction direction of the output end of the high-frequency electric cylinder, thereby simulating a vibration test on the piston rod of the workpiece to be tested.

[0004] With respect to the above-mentioned related technologies, in order to accurately reproduce the vibration conditions of complex road conditions, it is necessary to continuously improve the simulated vibration intensity. When the high-frequency electric cylinder applies a moving test force of nearly 10kN to the test area of ​​the fixture and the shock absorber, in order to ensure that the fixture stably clamps the test area of ​​the shock absorber, and considering the friction coefficient between the fixture and the test area of ​​the shock absorber, the fixture is usually required to provide a clamping force on the test area of ​​the shock absorber that is much greater than 10kN; and, in order to reduce the impact on the test data of the high-frequency electric cylinder and the space for installing the fixture structure inside the vibration test bench is very limited, it is necessary to control the overall weight and inertia of the fixture structure, and the lightweight clamping structure in the existing technology is difficult to provide such a large clamping force in a limited space, resulting in the fixture and the shock absorber test area being easily misaligned during high-intensity testing, thereby affecting the final test accuracy, so it needs to be improved. Summary of the Invention

[0005] In order to improve the testing accuracy of a test bench, the present application provides a vibration test bench for a shock absorber and a testing method thereof.

[0006] In a first aspect, the present application provides a vibration test bench for a shock absorber, which adopts the following technical solution:

[0007] A vibration test bench for a shock absorber comprises a base and a fixing frame arranged on the base, a fixing assembly for fixing a workpiece to be tested is arranged between the base and the fixing frame; a frame is arranged on a side of the fixing frame away from the base, a clamping assembly for clamping a test end of the workpiece to be tested is arranged on the frame, and a lifting member is arranged on the frame for driving the clamping assembly to perform high-frequency lifting and lowering movements.

[0008] By adopting the above technical solution, the fixing component fixes the test piece and the base, the clamping component provides a stable clamping force of not less than 10kN to the test end of the test piece, and the output end of the lifting component drives the clamping component to drive the test end of the test piece to perform high-frequency lifting and lowering movements, so as to perform stable vibration testing on the test end of the test piece, thereby improving the test accuracy of the test bench.

[0009] Preferably, the fixing assembly includes a fixing block, a bearing seat, a positioning member, a lifting plate and a lifting cylinder; the fixing block is arranged on the side wall of the fixing frame facing the base, and a passage opening is provided on the fixing block for the tested end of the test piece to pass through, and the fixing block is provided with a flared groove for the tested end to be pressed into the inner side wall of the passage opening, and a makeshift opening is provided on the outer side wall of the fixing block to facilitate the tested end of the tested piece to press into the passage opening; the bearing seat is arranged on the side wall of the base facing the fixed block, and the positioning member is arranged on the bearing seat for auxiliary positioning of the tested piece; the lifting plate is arranged on the side wall of the bearing seat facing the base, and the lifting cylinder is arranged on the base for driving the lifting plate close to or away from the fixed block.

[0010] By adopting the above technical solution, the positioning member stably positions the workpiece to be tested on the supporting seat, and the output end of the lifting cylinder drives the lifting plate to bring the workpiece to be tested gradually closer to the fixed block, so that the end of the workpiece to be tested gradually passes through the passage, and the end of the workpiece to be tested away from the supporting seat is pressed into the inside of the flared groove, so as to achieve the fixation of the workpiece to be tested.

[0011] Preferably, the positioning member includes a positioning seat, a plug-in rod, an anti-slip plate and a positioning rod; the positioning seat is arranged at the end of the supporting seat facing the fixed block, and the side wall of the positioning seat is provided with a placement notch for facilitating the insertion of the end of the test piece away from the fixed block; the inner side wall of the placement notch is penetrated by a plug-in hole, the plug-in rod is passed through the inside of the plug-in hole, the anti-slip plate is arranged at the end of the plug-in rod, and the anti-slip plate faces the side wall of the plug-in rod and abuts against the inner side wall of the placement notch; the positioning rod is arranged on the side wall of the anti-slip plate away from the plug-in rod, so as to pass through the end of the test piece away from the fixed block.

[0012] By adopting the above technical solution, the plug-in rod is inserted into the plug-in hole to realize the rapid positioning of the plug-in rod and the positioning seat; the positioning rod passes through the end of the workpiece to be tested away from the fixed block, and the anti-slip plate restricts the plug-in rod and the positioning rod from being separated from the positioning seat, so that the positioning rod can be used to realize the rapid positioning of the workpiece to be tested, reducing the phenomenon of the workpiece to be tested being skewed during the process of the support seat driving the workpiece to be tested to move up and down.

[0013] Preferably, the clamping assembly includes a mounting plate, a mounting block, two groups of clamping arms, a clamping block and a driving member; the mounting plate is arranged at the output end of the lifting member, and the mounting block is arranged on the side wall of the mounting plate away from the lifting member; the two groups of clamping arms are rotatably arranged at the end of the mounting block facing the fixed frame, and the clamping arms are relatively distributed on both sides of the width direction of the mounting block; the clamping block is arranged on the side walls of the two groups of clamping arms facing each other, and the side walls of the two groups of clamping blocks facing each other are provided with clamping grooves for the tested ends of the test pieces to be pressed into; the side walls of the two clamping arms away from each other are inclined in the direction away from the clamping block, and the driving member is arranged on the mounting plate to drive the two groups of clamping blocks to approach or move away from each other.

[0014] By adopting the above technical solution, the driving member drives the two sets of clamping arms to rotate, so that the clamping blocks approach each other, so as to provide a stable clamping force for the test end of the workpiece to be tested; when the clamping arms are driven to drive the clamping blocks away from each other, the clamping of the clamping blocks on the workpiece to be tested can be quickly released so that the workpiece to be tested can be replaced.

[0015] Preferably, the driving member includes a driving frame, a driving cylinder, a rolling wheel and a warping block; the driving frame is slidably arranged on the outside of the two groups of clamping arms, and the driving cylinder is arranged between the driving frame and the mounting plate to drive the driving frame close to or away from the mounting plate; the rolling wheel is rotatably arranged inside the driving frame, and all the clamping arms are located between the two groups of rolling wheels, and the rolling wheels and the clamping arms are respectively arranged in one-to-one correspondence, and the side wall of each rolling wheel facing the clamping arm is abutted against the side wall of the corresponding clamping arm; the ends of the two groups of clamping arms away from the mounting blocks are extended in directions away from each other, and the distance between each clamping arm and the corresponding rolling wheel gradually decreases in the direction away from the mounting block; the warping block is bent and arranged on the side walls of the two groups of clamping arms away from each other, each of the warping blocks is located at the end of the clamping arm close to the mounting block, and each of the warping blocks can abut against the corresponding rolling wheel.

[0016] By adopting the above technical solution, the output end of the driving cylinder drives the driving frame to move up and down. In the process of the driving frame driving the rolling wheel to gradually approach the clamping block, the two groups of clamping blocks gradually approach each other and stably clamp the test end of the workpiece to be tested. When the driving frame drives the rolling wheel to gradually approach and abut the warping block, the warping block causes the clamping arm to drive the ends of the clamping blocks to gradually move away from each other, so that the clamping blocks can release the clamping of the workpiece to be tested.

[0017] The overall structure of the clamping assembly is very compact, symmetrical and lightweight, which allows it to provide a clamping force of no less than 30kN to the clamping block and the end to be tested in the compact internal space of the test bench, thereby ensuring the clamping stability of the clamping assembly on the end to be tested during high-intensity tests. In addition, the symmetrical and lightweight clamping assembly reduces the off-center load on the lifting part during testing, reducing the impact on the final test data, thereby ensuring the final test accuracy.

[0018] Preferably, a pressing assembly is provided on the positioning seat for assisting in pressing and fixing the piece to be tested; and a clamping assembly is provided on the positioning seat for clamping and fixing the piece to be tested on the positioning seat.

[0019] By adopting the above technical solution, the pressing component assists in pressing and fixing the workpiece to be tested inside the positioning seat, and the clamping component clamps and fixes the workpiece to be tested on the positioning seat, thereby improving the connection stability between the workpiece to be tested and the positioning seat, thereby improving the fixing stability of the fixing component on the workpiece to be tested, and further improving the accuracy and stability of the vibration test bench in detecting the workpiece to be tested.

[0020] Preferably, the pressing assembly includes a rotating shaft, a pressing rod, a pressing block, a torsion piece and a linkage piece; the rotating shaft is rotatably set on the lifting plate, the pressing rod is set on the rotating shaft, the pressing block is set on the side wall of the pressing rod facing the positioning seat, and the pressing block is provided with a pressing groove for the end of the test piece to be pressed into; the torsion piece is set between the pressing rod and the lifting plate to drive the pressing rod to move in the direction away from the positioning seat through its own torque; the linkage piece is set on the lifting plate to drive the pressing rod to drive the pressing block to approach the positioning seat.

[0021] By adopting the above technical solution, the torsion piece drives the pressing rod to drive the pressing block away from the positioning seat, thereby reducing the phenomenon that the pressing block blocks the placement gap and affects the loading of the workpiece to be tested; the linkage piece drives the pressing rod to drive the pressing block close to the positioning seat, so that the pressing block can stably press and fix the workpiece to be tested inside the positioning seat.

[0022] Preferably, the linkage part includes a linkage block, a traction rope and a guide wheel; the linkage block is arranged on the pressing rod, the traction rope is arranged on the linkage block, the guide wheel is mounted on the lifting plate, and the end of the traction rope away from the linkage block passes through the guide wheel and is connected to the base.

[0023] The camming mechanism that the camming mechanism is used for the test piece is pressed downwards, and the camming mechanism is pressed downwards, so that the test piece is moved slowly upwards and the test piece is moved back to the workbench, thereby improving the test accuracy.

[0024] Preferably, the clamping assembly includes a mounting shaft, a rotating arm, a clamping block, a reset member, a pull rope and a cable tie rack; the mounting shaft is rotatably arranged on both sides of the width direction of the positioning seat, the rotating arm is arranged on each group of mounting shafts, the clamping block is arranged at the end of each group of rotating arms away from the mounting shaft, and the clamping block is located on the side wall of the rotating arm facing the positioning seat, and the side walls on both sides of the width direction of the positioning seat are penetrated by a clearance gap connected to the inside of the placement gap for the clamping block to pass through, and the clamping block is used to clamp and fix the test piece inside the placement gap; the reset member is arranged between the rotating arm and the positioning seat to drive each group of rotating arms to move in the direction away from the positioning seat through its own torque; the pull rope is arranged at the end of each group of rotating arms away from the mounting shaft, and the cable tie rack is arranged on the positioning seat, and the end of each pull rope away from the rotating arm passes through the cable tie rack and is connected to the base.

[0025] By adopting the above technical solution, the reset member drives the rotating arm to drive the clamping block away from the positioning seat through its own torque, thereby reducing the phenomenon that the clamping block hinders the convenient loading of the test piece; in the process of the lifting cylinder driving the lifting plate to drive the positioning seat away from the base, the pull rope is used to drive the rotating arm to drive the clamping block to rotate toward the positioning seat, and the lifting and lowering movement of the lifting plate is used to realize the driving of the clamping block, thereby saving costs;

[0026] In addition, the reset member and the pull rope are used to cooperate with the lifting and lowering movement of the positioning seat to combine the two steps of supporting the positioning seat and closing the clamping block to clamp the workpiece to be tested into one step, and the two steps of lowering the positioning seat and rotating the clamping block to open the placement gap are combined into one step, which ensures the stable fixation of the workpiece to be tested while simplifying the operation steps and production costs.

[0027] Secondly,

[0028] The present application provides a testing method for a vibration test bench for a shock absorber, comprising the following steps:

[0029] Loading: The fixing component fixes the workpiece to be tested on the fixing frame to realize the loading of the workpiece to be tested;

[0030] Clamping: The clamping assembly clamps and fixes the test end of the fixed test piece;

[0031] Testing: The lifting member drives the clamping assembly to move the test end of the test piece up and down at high frequency to perform vibration testing.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] By setting a fixing component to fix the DUT and the base, the clamping component provides a stable clamping force of not less than 30kN to the DUT end of the DUT. The output end of the lifting component drives the clamping component to move the DUT end of the DUT up and down at high frequency, so as to perform a stable vibration test on the DUT end of the DUT, thereby improving the test accuracy of the test bench;

[0034] By arranging the clamping assembly to cooperate with the lifting member, the overall structure of the clamping assembly is very compact. In this embodiment, the space occupied is only 260mm*70mm*220mm. The overall clamping structure is symmetrical and very lightweight, which reduces the impact of the lifting member on the test piece.

[0035] By setting a pressing component to assist in pressing and fixing the workpiece to be tested inside the positioning seat, the clamping component clamps and fixes the workpiece to be tested on the positioning seat, thereby improving the connection stability between the workpiece to be tested and the positioning seat, thereby improving the fixing stability of the fixing component on the workpiece to be tested, and further improving the accuracy and stability of the vibration test bench in detecting the workpiece to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a structural schematic diagram of a vibration test bench for a shock absorber and a testing method thereof according to Example 1 of the present application.

[0037] Figure 2 It is a structural diagram for illustrating the connection relationship between the clamping assembly and the piece to be tested in Example 1.

[0038] Figure 3 It is an exploded schematic diagram used to illustrate the connection relationship between the fixed component and the device under test in Example 1.

[0039] Figure 4 It is an exploded schematic diagram used to illustrate the connection relationship between the lifting member and the clamping assembly in Example 1.

[0040] Figure 5It is a structural diagram used to reflect the connection relationship between the pressing component and the positioning seat in Example 2.

[0041] Figure 6 It is a structural diagram for illustrating the connection relationship between the clamping assembly and the positioning seat in Example 2.

[0042] Description of reference numerals:

[0043] 1. Base; 10. Measured object; 101. Measured end; 11. Fixing frame; 12. Frame; 13. Lifting element; 2. Fixing assembly; 21. Fixing block; 211. Passageway; 212. Clearance opening; 22. Bearing seat; 23. Positioning element; 231. Positioning seat; 2311. Placement notch; 2312. Plug-in hole; 2313. Clearance notch; 232. Plug-in rod; 233. Anti-slip plate; 234. Positioning rod; 24. Lifting plate; 25. Lifting cylinder; 3. Clamping assembly; 31. Mounting plate; 32. Mounting block; 3 3. Clamping arm; 34. Clamping block; 341. Clamping groove; 35. Driving member; 351. Driving frame; 352. Driving cylinder; 353. Rolling wheel; 354. Warping block; 4. Pressing assembly; 41. Rotating shaft; 42. Pressing rod; 43. Pressing block; 431. Pressing groove; 44. Torque member; 45. Linkage member; 451. Linkage block; 452. Pull rope; 453. Guide wheel; 5. Clamping assembly; 51. Mounting shaft; 52. Rotating arm; 53. Clamping block; 54. Resetting member; 55. Pull rope; 56. Cable tie rack. DETAILED DESCRIPTION

[0044] The following is combined with Figure 1-6 This application is described in further detail.

[0045] Example 1:

[0046] Example 1 of the present application discloses a vibration test bench for a shock absorber and a testing method thereof, which are used to improve the clamping stability of the shock absorber test area and improve the testing accuracy of the test bench.

[0047] Reference Figure 1 and Figure 2 A vibration test bench for shock absorbers includes a base 1 secured to the ground by anchor bolts, a mounting bracket 11 secured to the base 1 by three sets of columns, and a frame 12 fixedly connected to the columns mounted on the side of the mounting bracket 11 facing away from the base 1. In this embodiment, the three sets of columns are arranged in a triangular shape to enhance overall stability.

[0048] Reference Figure 1 、 Figure 2 and Figure 3A fixing assembly 2 for securing a test piece 10 is mounted between the base 1 and the fixing frame 11. Specifically, the test piece 10 is a shock absorber to be tested. A clamping assembly 3 for clamping the test end 101 of the test piece 10 is mounted on the frame 12. A lifting member 13 is mounted on the frame 12. The lifting member 13 is a high-frequency electric cylinder. The output end of the lifting member 13 is fixedly connected to the clamping assembly 3, driving the clamping assembly 3 to move the test end 101 of the test piece 10 at high frequency. A vibration sensor electrically connected to a computer terminal is mounted on the base 1 via a bracket to detect the impact force applied to the base 1 after the test piece 10 has been subjected to shock absorption.

[0049] Reference Figure 2 and Figure 3 The fixing assembly 2 includes a fixing block 21, a bearing seat 22, a positioning member 23, a lifting plate 24, and a lifting cylinder 25. The fixing block 21 is fixed to the side wall of the fixing frame 11 facing the base 1 by screws. The fixing block 21 is provided with a passage 211 for the test end 101 of the test piece 10 to pass through. The outer wall of the fixing block 21 is provided with a clearance opening 212 to facilitate the test end 101 of the test piece 10 to enter the passage 211. The fixing frame 11 is also provided with a passage gap for the test piece 10 to pass through. The fixing block 21 is provided with a flared groove on the inner side wall of the passage 211 for the test piece 10 to enter. The inner diameter of the flared groove gradually increases in the direction away from the fixing frame 11, so that the test piece 10 can enter the flared groove.

[0050] Reference Figure 1 and Figure 3 Lifting cylinder 25 is fixedly mounted within base 1, with the output end of lifting cylinder 25 extending through the upper surface of base 1. Lifting plate 24 is fixedly mounted to the output end of lifting cylinder 25, and a lifting rod is slidably connected to base 1 via a guide rod. Supporting seat 22 is fixedly mounted to the side wall of lifting plate 24 facing away from base 1 via screws. Positioning member 23 is fixedly mounted on supporting seat 22 to assist in positioning test piece 10.

[0051] Reference Figure 1 and Figure 3The positioning member 23 includes a positioning seat 231, a plug rod 232, an anti-slip plate 233, and a positioning rod 234. The positioning seat 231 is threadedly mounted on the end of the supporting seat 22 facing the fixed block 21. The side wall of the positioning seat 231 is provided with a placement notch 2311, and the inner side wall of the placement notch 2311 fits snugly with the outer side wall of the end of the test piece 10 away from the fixed block 21, so that the end of the test piece 10 away from the fixed block 21 can be pressed into place. The inner side wall of the placement notch 2311 is provided with a plug hole 2312, and the plug rod 232 slides through the plug hole 2312. The anti-slip plate 233 is integrally formed at the end of the plug rod 232 facing the placement notch 2311. The inner side wall of the placement notch 2311 is provided with a groove around the plug hole 2312 for the anti-slip plate 233 to press into.

[0052] Reference Figure 1 and Figure 4 The clamping assembly 3 includes a mounting plate 31, a mounting block 32, two sets of clamping arms 33, a clamping block 34, and a drive member 35. The mounting plate 31 is fixed to the output end of the lifting member 13 via screws, and the mounting block 32 is also fixed to the side wall of the mounting plate 31 facing away from the lifting member 13 via screws. The two sets of clamping arms 33 are both rotatably mounted to the end of the mounting block 32 facing the fixed frame 11 via a rotating shaft, and the clamping arms 33 are relatively distributed on both sides of the mounting block 32 in the width direction.

[0053] Reference Figure 2 and Figure 4 The clamping blocks 34 are mounted on the facing side walls of the two sets of clamping arms 33. The clamping blocks 34 are located at the end of each set of clamping arms 33 away from the mounting block 32. The facing side walls of the two sets of clamping blocks 34 are each provided with a clamping groove 341 for the test end 101 of the test piece 10 to press into, thereby increasing the contact area between the clamping blocks 34 and the test end 101 of the test piece 10. In this embodiment, the facing side walls of the two sets of clamping arms 33 are inclined away from the clamping blocks 34. Specifically, the angle between the inclination direction of the side wall of each set of clamping arms 33 away from the clamping block 34 and the vertical direction is no less than 4.2 degrees.

[0054] Reference Figure 1 and Figure 4 The drive member 35 is mounted on the mounting plate 31 and is used to drive the two sets of clamping blocks 34 toward or away from each other. The drive member 35 includes a drive frame 351, a drive cylinder 352, a roller 353, and a warping block 354. The drive cylinder 352 is fixedly mounted on the side wall of the mounting plate 31 facing the mounting block 32 and is located at both ends of the mounting plate 31 in the longitudinal direction. The drive frame 351 is fixedly connected to the output ends of the two sets of drive cylinders 352, so that the output ends of the drive cylinders 352 can be extended and retracted to achieve lifting and lowering movement. Both sets of clamping arms 33 are located within the drive frame 351.

[0055] Reference Figure 1 and Figure 4 The rolling wheels 353 are rotatably mounted inside the drive frame 351 via a rotating shaft, and all clamping arms 33 are located between two sets of rolling wheels 353. The rolling wheels 353 are respectively arranged in a one-to-one correspondence with the clamping arms 33, and each set of rolling wheels 353 faces the side wall of the clamping arm 33 and is used to press the side wall of the corresponding clamping arm 33.

[0056] Reference Figure 2 and Figure 4 The ends of the two groups of clamping arms 33 away from the mounting block 32 are extended in directions away from each other, and the distance between each group of clamping arms 33 and the corresponding rolling wheel 353 gradually increases toward the mounting block 32, so that when the rolling wheel 353 moves away from the mounting block 32, the two groups of rolling wheels 353 press the ends of the clamping blocks 34 driven by the clamping arms 33, and make the two groups of clamping blocks 34 gradually approach each other, and provide a clamping force of not less than 10kN on the test end 101 of the test piece 10.

[0057] Reference Figure 2 and Figure 4 The warping blocks 354 are bent and formed on the sidewalls of the two sets of clamping arms 33 that are spaced apart from each other. Each set of warping blocks 354 is located at the end of the clamping arm 33 near the mounting block 32, and each set of warping blocks 354 extends away from the clamping arm 33. Each set of warping blocks 354 can abut against a corresponding rolling wheel 353. When the rolling wheel 353 abuts against the corresponding warping block 354, the two sets of clamping arms 33 can be driven to move the ends of the clamping blocks 34 away from each other, thereby loosening the clamping of the test end 101 of the test piece 10.

[0058] In this embodiment, the selection of the cylinder diameter of the driving cylinder 352 is as follows:

[0059] Set according to common actual conditions:

[0060] The friction coefficient between the clamping block 34 and the end to be measured 101 is: 0.3;

[0061] The pressure provided by the air pressure system used to drive the cylinder 352 is: 0.5MPa;

[0062] The maximum moving force provided by the output end of the lifting member 13 is: 10kN;

[0063] The force-increasing angle of the clamping arm 33 away from the inclined side wall of the clamping block 34 is: 4.2°;

[0064] The clamping force perpendicular to the end to be tested 101 is not less than: 10 / 0.3=30kN;

[0065] According to the force-boosting angle of 4.2°,

[0066] The output force of the driving cylinder 352 must be no less than: 30*sin(4.2°)≈2.2kN;

[0067] According to the installation method of the driving cylinder 352, and in conjunction with the 0.5Mpa pressure provided by the air pressure system,

[0068] It can be obtained that the cross-sectional area of ​​the driving cylinder 352 should not be less than: 2.2*1000 / 0.5=4000mm 2 ;

[0069] The cylinder diameter of the driving cylinder 352 should not be less than: SQRT (4000 / 3.14) * 2 ≈ 71.4 mm;

[0070] In summary, in this embodiment, the drive cylinder 352 preferably has a cylinder diameter of 100 mm. In this embodiment, when the lift member 13 applies a vertical displacement force of 10 kN to the test end 101, the drive cylinder 352, in conjunction with the clamping arm 33 and clamping block 34, can exert a stable horizontal clamping force of no less than 30 kN on the test end 101.

[0071] The implementation principle of a vibration test bench for a shock absorber in Example 1 of the present application is as follows:

[0072] The workpiece 10 to be tested is placed inside the placement notch 2311 of the positioning seat 231, and the end of the workpiece 10 to be tested is sleeved on the positioning rod 234; the output end of the lifting cylinder 25 drives the lifting plate 24 to drive the positioning seat 231 and the workpiece 10 to gradually approach the fixed block 21, and makes the end to be tested 101 of the workpiece 10 to be tested pass through the passage 211, and the end of the workpiece 10 to be tested away from the positioning seat 231 is pressed into the inside of the flared groove, thereby realizing stable loading of the workpiece 10 to be tested.

[0073] The output end of the drive cylinder 352 drives the drive frame 351 gradually away from the mounting block 32, causing the rolling wheel 353 to roll the end of the clamping block 34 driven by the clamping arm 33, thereby bringing the two sets of clamping blocks 34 closer together and stably clamping the test end 101 of the test piece 10. The output end of the lifting member 13 drives the mounting plate 31 to drive the clamping blocks 34 and the test end 101 of the test piece 10 to perform high-frequency lifting and lowering movements, thereby achieving stable testing of the test end 101 of the test piece 10, thereby improving the clamping stability of the shock absorber test area and enhancing the testing accuracy of the test bench.

[0074] Example 1 of the present application also discloses a testing method for a vibration test bench for a shock absorber, comprising the following steps:

[0075] Loading: The fixing assembly 2 fixes the test piece 10 on the fixing frame 11 to realize the loading of the test piece 10;

[0076] Clamping: The clamping assembly 3 clamps and fixes the test end 101 of the fixed test piece 10;

[0077] Testing: The lifting member 13 drives the clamping assembly 3 to move the test end 101 of the test piece 10 up and down at high frequency to perform a vibration test. The vibration sensor detects the impact force on the base 1 and transmits it to the computer terminal, thereby detecting the motion characteristics of the test piece 10 at different vibration speeds and frequencies, and then generating corresponding curves to confirm the function of the shock absorber.

[0078] Example 2:

[0079] The difference between Example 2 and Example 1 is that: Figure 5 and Figure 6 A pressing assembly 4 is mounted on the positioning seat 231 to assist in pressing and securing the test piece 10. The pressing assembly 4 includes a rotating shaft 41, a pressing rod 42, a pressing block 43, a torsion member 44, and a linkage member 45. The rotating shaft 41 is rotatably connected to the side wall of the lifting plate 24. The pressing rod 42 is integrally formed on the rotating shaft 41, and the pressing block 43 is integrally formed on the end of the pressing rod 42 away from the rotating shaft 41. The pressing block 43 is located on the side wall of the pressing rod 42 facing the positioning seat 231, and the side wall of the pressing block 43 is provided with a pressing groove 431 for the end of the test piece 10 to press into, so that the end of the test piece 10 is tightly fitted with the inner side wall of the pressing groove 431.

[0080] Reference Figure 5 and Figure 6 In this embodiment, the torsion member 44 is a torsion spring; the torsion member 44 is sleeved onto the rotating shaft 41. One end of the torsion member 44 is adhesively connected to the pressing rod 42, and the other end of the torsion member 44 is adhesively connected to the lifting plate 24. The torsion member 44, through its own torsion force, drives the pressing rod 42 to rotate the pressing block 43 away from the positioning seat 231.

[0081] Reference Figure 5 and Figure 6 The linkage member 45 is mounted on the lifting plate 24 to drive the pressing rod 42 to bring the pressing block 43 closer to the positioning seat 231. The linkage member 45 includes a linkage block 451, a traction rope 452, and a guide wheel 453. The linkage block 451 is fixedly mounted on the side wall of the pressing rod 42, and the traction rope 452 is fixedly mounted on the side wall of the linkage block 451. The guide wheel 453 is rotatably mounted on the side wall of the lifting plate 24 via a bracket. The end of the traction rope 452 away from the linkage block 451 passes through the guide wheel 453 and is fixedly connected to the base 1.

[0082] Reference Figure 5 and Figure 6When the lifting cylinder 25 drives the lifting plate 24 to move the positioning seat 231 away from the base 1, the traction rope 452 gradually tightens, and pulls the linkage block 451 to drive the pressing rod 42 to rotate, so that the pressing rod 42 drives the pressing block 43 to rotate toward the positioning seat 231, and the pressing block 43 stably presses the end of the test piece 10 inside the positioning seat 231.

[0083] Reference Figure 5 and Figure 6 A clamping assembly 5 is mounted on the positioning seat 231 to secure the test piece 10 to the positioning seat 231. The clamping assembly 5 includes a mounting shaft 51, a rotating arm 52, a clamping block 53, a reset member 54, a pull rope 55, and a cable tie 56. The mounting shafts 51 are rotatably mounted on both sides of the positioning seat 231 in the width direction via brackets, and the rotating arms 52 are fixedly mounted on the peripheral wall of each set of mounting shafts 51. Clearance notches 2313 are formed through the side walls of both sides of the positioning seat 231 in the width direction, and the clearance notches 2313 are connected to the interior of the placement notch 2311.

[0084] Reference Figure 5 and Figure 6 The engaging blocks 53 are integrally formed at the ends of each set of rotating arms 52, distal from the mounting shaft 51. The engaging blocks 53 are located on the sidewalls of the rotating arms 52 facing the positioning seat 231. In this embodiment, the sidewalls of the engaging blocks 53 engage with the ends of the DUT 10 located within the positioning seat 231. The engaging blocks 53 can pass through the clearance notches 2313 and engage with the ends of the DUT 10 located within the positioning seat 231, thereby preventing the DUT 10 from disengaging from the positioning seat 231.

[0085] Reference Figure 5 and Figure 6 In this embodiment, the reset member 54 is a torsion spring; the reset member 54 is sleeved onto the mounting shaft 51. One end of the reset member 54 is adhesively connected to the rotating arm 52, and the other end of the reset member 54 is adhesively connected to the positioning seat 231. The reset member 54, through its own torsional force, drives the rotating arm 52 to rotate the engaging block 53 away from the positioning seat 231.

[0086] Reference Figure 5 and Figure 6 The pull rope 55 is fixedly installed on the end of each set of rotating arms 52 away from the mounting shaft 51, and the cable rack 56 is fixedly installed on the side wall of the positioning seat 231. The end of each set of pull ropes 55 away from the rotating arm 52 passes through the cable rack 56 and the lifting plate 24 and is fixedly connected to the base 1.

[0087] Reference Figure 5 and Figure 6When the lifting cylinder 25 drives the lifting plate 24 to move the positioning seat 231 away from the base 1, the pull rope 55 gradually tightens and pulls the rotating arm 52 to rotate, so that the rotating arm 52 drives the clamping block 53 to rotate toward the positioning seat 231, and the clamping block 53 clamps and fixes the end of the test piece 10 inside the positioning seat 231.

[0088] 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 vibration test bench for a shock absorber, characterized in that: The invention comprises a base (1) and a fixing frame (11) arranged on the base (1); a fixing assembly (2) for fixing a test piece (10) is arranged between the base (1) and the fixing frame (11); a frame (12) is arranged on a side of the fixing frame (11) away from the base (1); a clamping assembly (3) for clamping a test end (101) of the test piece (10) is arranged on the frame (12); and a lifting member (13) is arranged on the frame (12) for driving the clamping assembly (3) to perform high-frequency lifting and lowering movements; The fixing assembly (2) comprises a fixing block (21), a lifting plate (24), a lifting cylinder (25), a bearing seat (22) arranged on the base (1), and a positioning member (23) arranged on the bearing seat (22) for assisting in positioning the test piece (10); The positioning member (23) comprises a positioning seat (231), a plug-in rod (232), an anti-slip plate (233) and a positioning rod (234); the positioning seat (231) is arranged at the end of the supporting seat (22) facing the lifting member (13); the side wall of the positioning seat (231) is provided with a placement notch (2311) for facilitating the end of the test piece (10) away from the fixed block (21) to be pressed into; the inner side wall of the placement notch (2311) is provided with a plug-in hole (232) 312), the plug rod (232) is inserted into the plug hole (2312), the anti-slip plate (233) is arranged at the end of the plug rod (232), and the side wall of the anti-slip plate (233) facing the plug rod (232) is against the inner side wall of the placement gap (2311); the positioning rod (234) is arranged on the side wall of the anti-slip plate (233) away from the plug rod (232) to penetrate the end of the test piece (10) away from the fixed block (21); The clamping assembly (3) comprises a mounting plate (31), a mounting block (32), two groups of clamping arms (33), a clamping block (34) and a driving member (35); the mounting plate (31) is arranged at the output end of the lifting member (13), and the mounting block (32) is arranged on the side wall of the mounting plate (31) away from the lifting member (13); the two groups of clamping arms (33) are both rotatably arranged at the end of the mounting block (32) facing the fixed frame (11), and the clamping arms (33) are relatively distributed at the ends of the mounting block (32). On both sides in the width direction; the clamping blocks (34) are arranged on the side walls of the two groups of clamping arms (33) facing each other, and the side walls of the two groups of clamping blocks (34) facing each other are both provided with clamping grooves (341) for the test end (101) of the test piece (10) to be pressed into; the side walls of the two clamping arms (33) away from each other are both inclined in the direction away from the clamping blocks (34), and the driving member (35) is arranged on the mounting plate (31) to drive the two groups of clamping blocks (34) to move closer to each other or away from each other; A pressing assembly (4) is provided on the positioning seat (231) for assisting in pressing and fixing the test piece (10); the pressing assembly (4) comprises a rotating shaft (41), a pressing rod (42), a pressing block (43), a torsion piece (44) and a linkage piece (45); the rotating shaft (41) is rotatably provided on the lifting plate (24), the pressing rod (42) is provided on the rotating shaft (41), and the pressing block (43) is provided when the pressing rod (42) is directed toward the positioning seat (231). 31), and the pressing block (43) is provided with a pressing groove (431) for the end of the test piece (10) to be pressed into; the torsion member (44) is arranged between the pressing rod (42) and the lifting plate (24) to drive the pressing rod (42) to move in a direction away from the positioning seat (231) through its own torsion force; the linkage member (45) is arranged on the lifting plate (24) to drive the pressing rod (42) to drive the pressing block (43) to approach the positioning seat (231).

2. The vibration test bench for shock absorbers according to claim 1, characterized in that: The fixed block (21) is arranged on the side wall of the fixed frame (11) facing the base (1); a passage (211) is provided on the fixed block (21) for the tested end (101) of the tested piece (10) to pass through; an expansion groove is provided on the inner side wall of the passage (211) for the tested piece (10) to be pressed into, and a clearance opening (212) is provided on the outer side wall of the fixed block (21) to facilitate the tested end (101) of the tested piece (10) to be pressed into the passage (211); the bearing seat (22) is located on the side wall of the base (1) facing the fixed block (21); the lifting plate (24) is provided on the side wall of the bearing seat (22) facing the base (1); and the lifting cylinder (25) is provided on the base (1) to drive the lifting plate (24) to approach or move away from the fixed block (21).

3. The vibration test bench for shock absorbers according to claim 1, characterized in that: The driving member (35) includes a driving frame (351), a driving cylinder (352), a rolling wheel (353) and a warping block (354); the driving frame (351) is slidably arranged outside the two groups of clamping arms (33), and the driving cylinder (352) is arranged between the driving frame (351) and the mounting plate (31) to drive the driving frame (351) to approach or move away from the mounting plate (31); the rolling wheel (353) is rotatably arranged inside the driving frame (351), and all the clamping arms (33) are located between the two groups of rolling wheels (353). The rolling wheels (353) and the clamping arms (33) are respectively arranged in a one-to-one correspondence, and each The side walls of the rolling wheels (353) facing the clamping arms (33) are in contact with the side walls of the corresponding clamping arms (33); the ends of the two groups of clamping arms (33) away from the mounting block (32) are extended in directions away from each other, and the distance between each clamping arm (33) and the corresponding rolling wheel (353) gradually decreases in the direction away from the mounting block (32); the warping blocks (354) are bent and arranged on the side walls of the two groups of clamping arms (33) away from each other, each of the warping blocks (354) is located at the end of the clamping arm (33) close to the mounting block (32), and each of the warping blocks (354) can be in contact with the corresponding rolling wheel (353).

4. The vibration test bench for shock absorbers according to claim 1, characterized in that: The linkage member (45) comprises a linkage block (451), a traction rope (452) and a guide wheel (453); the linkage block (451) is arranged on the pressing rod (42), the traction rope (452) is arranged on the linkage block (451), the guide wheel (453) is mounted on the lifting plate (24), and the end of the traction rope (452) away from the linkage block (451) passes through the guide wheel (453) and is connected to the base (1).

5. The vibration test bench for shock absorbers according to claim 1, characterized in that: The positioning seat (231) is provided with a clamping assembly (5) for clamping and fixing the test piece (10) on the positioning seat (231).

6. The vibration test bench for shock absorbers according to claim 5, characterized in that: The clamping assembly (5) comprises a mounting shaft (51), a rotating arm (52), a clamping block (53), a reset member (54), a pull rope (55) and a cable tie rack (56); the mounting shaft (51) is rotatably arranged on both sides of the width direction of the positioning seat (231); the rotating arm (52) is arranged on each set of mounting shafts (51); the clamping block (53) is arranged at the end of each set of rotating arms (52) away from the mounting shaft (51); and the clamping block (53) is located on the side wall of the rotating arm (52) facing the positioning seat (231); and the side walls on both sides of the width direction of the positioning seat (231) are penetrated by a recessed notch connected to the inside of the placement notch (2311). The opening (2313) is provided for the clamping block (53) to pass through, and the clamping block (53) is used to clamp and fix the test piece (10) inside the placement notch (2311); the reset member (54) is arranged between the rotating arm (52) and the positioning seat (231) to drive each group of rotating arms (52) to move in a direction away from the positioning seat (231) through its own torque; the pull rope (55) is arranged at the end of each group of rotating arms (52) away from the installation shaft (51), and the cable rack (56) is arranged on the positioning seat (231), and the end of each pull rope (55) away from the rotating arm (52) passes through the cable rack (56) and is connected to the base (1).

7. A method for testing a vibration test bench for a shock absorber according to any one of claims 1 to 6, characterized in that: The steps include: Loading: The fixing component (2) fixes the test piece (10) on the fixing frame (11) to realize the loading of the test piece (10); Clamping: The clamping assembly (3) clamps and fixes the end to be tested (101) of the fixed piece to be tested (10); Testing: The lifting member (13) drives the clamping assembly (3) to drive the end to be tested (101) of the tested object (10) to move up and down at high frequency to perform vibration testing.

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