System and method for testing stability performance of piston rod of shock absorber of new energy automobile

Abstract

The invention relates to the technical field of shock absorber piston rods, in particular to a test system and a test method for the stability performance of a shock absorber piston rod of a new energy automobile, which solve the defects in the prior art, the test system comprises a base, a vibration mechanism, an adjusting mechanism, a fixing mechanism, a connecting mechanism I and a connecting mechanism II, an operation table with a PLC is arranged on the machine base, a circular cavity is formed in the machine base, the vibration mechanism is arranged on the periphery of the circular cavity in the vertical direction, and the vibration mechanism provides vibration feeling generated when a simulated vehicle is bumped or impacted in a reciprocating linear elastic motion mode. The adjusting mechanism is fixed between the side walls of the vibration mechanism and moves above the circular cavity in the vertical direction, and a first output shaft and a second output shaft which are opposite in movement direction are arranged on the adjusting mechanism. Compared with the prior art, the stability performance of the shock absorber piston rod can be effectively simulated and tested.

Description

Technical Field

[0001] The present invention relates to the technical field of shock absorber piston rods, and particularly to a test system and a test method for the stability performance of shock absorber piston rods of new energy vehicles. Background Art

[0002] As an important part of the vehicle suspension system, the main function of the shock absorber is to attenuate road shocks, suppress vehicle body vibrations, and improve the ride comfort and handling stability of the vehicle. As the core moving part of the shock absorber, the stability performance of the piston rod directly affects the working efficiency and service life of the shock absorber. The hazards of insufficient piston rod stability include but are not limited to the following: 1. It can lead to faults such as abnormal noises and oil leakage in the shock absorber, reducing the ride comfort; 2. It affects the vehicle handling stability and increases the potential safety hazards during driving; 3. It shortens the service life of the shock absorber and increases the user's usage cost.

[0003] Currently, the test methods for the stability performance of shock absorber piston rods mainly rely on traditional bench tests and road tests, and the traditional test methods mainly focus on the static performance of the piston rod, making it difficult to comprehensively evaluate its dynamic stability performance. For the performance test of shock absorber piston rods, more specific manifestations are all based on some phenomena that occur during the driving process on dynamic roads. For example, when the vehicle encounters bumps or impacts (i.e., when passing through potholes, speed bumps, or severely bumpy roads), the wheels move upward, pushing the shock absorber to compress, and the piston rod is subjected to a downward axial force. When the wheels move downward, the shock absorber rebounds, and the piston rod is subjected to an upward axial force. In this dynamic process, the movement between the shock absorber piston rod and the cylinder body is relative. However, the current test equipment cannot be applied to the relevant tests of this project.

[0004] Therefore, we propose a test system and a test method for the stability performance of shock absorber piston rods of new energy vehicles to solve the above-mentioned problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a test system and a test method for the stability performance of shock absorber piston rods of new energy vehicles to solve the problems raised in the above background art.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: A test system for the stability performance of shock absorber piston rods of new energy vehicles includes a machine base, a vibration mechanism, an adjustment mechanism, a fixing mechanism, a connecting mechanism I, and a connecting mechanism II. A control console with a PLC controller is arranged on the machine base, and a circular cavity is opened on the machine base; The vibration mechanism is arranged along the vertical direction on the periphery of the circular cavity, and the vibration mechanism provides a vibration feeling similar to that generated when the vehicle encounters bumps or impacts in an elastic reciprocating linear motion manner; The adjusting mechanism is fixed between the side walls of the vibrating mechanism, and the adjusting mechanism moves vertically above the circular cavity. An output shaft one and an output shaft two with opposite movement directions are arranged on the adjusting mechanism; The fixing mechanism is connected to the top end of the output shaft two and moves synchronously therewith. A shock absorber cylinder body is clamped on the fixing mechanism; The connecting mechanism one is connected to the top end of the output shaft one and moves synchronously therewith; The connecting mechanism two is elastically connected to the connecting mechanism one, and a shock absorber piston rod is arranged at the bottom of the connecting mechanism two. The bottom end of the shock absorber piston rod is installed in the shock absorber cylinder body.

[0007] In one embodiment, the vibrating mechanism includes a lifting seat, a first elastic component, side seats and shaft seats. The lifting seat is arranged in an annular structure. A "U"-shaped mounting seat is fixed on the inner surface of the lifting seat. There are two side seats which are symmetrically installed on the outer surface of the lifting seat. Four groups of first elastic components are arranged and are all installed between the bottom wall of the lifting seat and the top surface of the machine base; Two relatively distributed shaft seats are arranged on the machine base below the side seats. A first rotating motor is installed on the machine base outside one of the shaft seats. Synchronous wheels are rotatably arranged on the same side side walls of two of the relatively shaft seats located on both sides of the circular cavity. The two synchronous wheels are connected by a synchronous belt, and one of the synchronous wheels rotates driven by the first rotating motor.

[0008] In one embodiment, the vibrating mechanism further includes a force applying component. The force applying component includes a first fixed cylinder, a first piston shaft, a connecting seat, a first connecting piece, a first cam and a connecting rod. The top ends of the first fixed cylinder and the connecting rod are both fixed on the bottom wall of the side seat. The connecting rod is located in the middle of the first fixed cylinder. A limiting part is arranged at the bottom end of the connecting rod, and the longitudinal section of the limiting part is an isosceles trapezoid; The top end of the first piston shaft always slides between the inner walls of the first fixed cylinder. An inner cavity is opened in the first piston shaft. The connecting rod penetrates and extends into the inner cavity, and the limiting part always slides between the inner walls of the inner cavity. A second spring is arranged outside the connecting rod located in the inner cavity, and the second spring is located between the top wall of the limiting part and the top wall of the inner cavity; The connecting seat is fixed on the bottom end of the first piston shaft. One end of the first connecting piece is connected to the connecting seat by a shaft, and the two sides of the other end are connected to the first cam by a shaft. The length of the first connecting piece can be manually adjusted by means of threaded connection. The other end of the first cam is connected with a rotating shaft, and the other end of the rotating shaft rotates between the inner walls of the shaft seat; Wherein, the output shaft of the first rotating motor is connected to one of the rotating shafts and drives it. The two synchronous wheels are respectively arranged on one of the rotating shafts and the rotating shaft close to it.

[0009] In one embodiment, the adjusting mechanism further includes a vertical plate, a linkage handle, a rotating handle, and a second connecting member. The vertical plate is fixedly arranged between the side walls of the mounting base in the vertical direction. A second cam is rotatably arranged on one side wall of the vertical plate, and a second rotating motor for driving the second cam is installed on the other side wall of the vertical plate; The rotating handle is rotatably arranged on one side wall of the vertical plate through a shaft connection, and one end of the rotating handle is provided with the linkage handle through a shaft connection with the second cam. Two limiting seats are arranged on the side wall of the vertical plate. The first output shaft and the second output shaft respectively penetrate through the limiting seats and move and adjust in the vertical direction. Connecting blocks are arranged at the bottom ends of the first output shaft and the second output shaft. Two second connecting members are provided and are respectively arranged between the connecting blocks on the same side and the end of the rotating handle. The length of the second connecting member can be adjusted, and the movements of the second cam and the rotating handle do not interfere with each other.

[0010] In one embodiment, the fixing mechanism includes a fixing frame, a first connecting plate, an L-shaped plate, and a tension spring. The fixing frame has a "U" - shaped structure, and positioning holes are respectively formed at its top end and bottom end. Two arc - shaped limiting blocks with elastic adjustment and two fastening members one connected by threads are arranged in the positioning holes. The fastening member one is a set screw, and a plurality of convex pieces are also arranged in the positioning hole at the top end of the fixing frame; One end of the L - shaped plate always slides vertically between the inner walls of the fixing frame, and the tension spring is connected between the L - shaped plate and the same - side side wall of the fixing frame. A "convex" - shaped guiding block is installed on one of the vertical side walls of the fixing frame. A vertical seat is arranged on the mounting base in the vertical direction. A vertical shaft is vertically installed between the inner walls of the vertical seat. The guiding block slides between the inner walls of the vertical seat, and the vertical shaft penetrates through the guiding block and is in sliding contact with it. A guiding shaft is also arranged at the bottom end of the L - shaped plate. The guiding shaft penetrates through the lifting seat and is slidably arranged with it. A limiting boss always located below the lifting seat is arranged at the bottom end of the guiding shaft; One end of the first connecting plate is fixed to the top end of the second output shaft and is perpendicular to it. The other end of the first connecting plate is fixed to the side wall of the fixing frame. An electric cylinder is installed on the first connecting plate. A push block is arranged at the movable end of the electric cylinder. The side wall of the push block facing the shock absorber piston rod is arc - shaped.

[0011] In one embodiment, the first connecting mechanism includes a second connecting plate, an adjustment box, a gear, and a rotating member. One end of the second connecting plate is fixed to the top of the first output shaft and is vertically arranged therewith. A support frame is further arranged between the bottom end of the second connecting plate and the first output shaft. The adjustment box penetrates and slides between the inner wall and the top wall of the second connecting plate. A groove is formed along the length direction of the adjustment box. An adjustment block is slidably arranged between the inner walls of the groove. A transverse shaft that slidably contacts therewith penetrates through the middle of the adjustment block. The transverse shaft is fixed in the groove. A measurement box is further installed on the top wall of the second connecting plate. A control power supply and a distance sensor are respectively arranged in the measurement box. The distance sensor is arranged opposite to the adjustment box; The end of the second connecting plate away from the first output shaft is arranged in a "U" - shaped structure, and protrusions are installed on the opposite side walls at this end. The gear is rotatably arranged on the second connecting plate through a shaft. The rotating member is arranged in an arc - shaped strip structure. Arc - shaped grooves are formed on both the top wall and the bottom wall of the rotating member. The protrusions are matched with the arc - shaped grooves and can rotatably contact therewith. And tooth grooves are evenly formed on the outer surface of the rotating member facing the gear. The gear is meshed with the tooth grooves.

[0012] In one embodiment, the second connecting mechanism includes a connecting box, a bushing, a third connecting member, a synchronous arm, and a second elastic component. A "T" - shaped connecting bolt three is arranged on the top of the connecting box. One end of the synchronous arm is fixed to the connecting bolt three, and the other end of the synchronous arm is movably arranged through a shaft connection with the adjustment block. A spherical cavity is formed in the middle of the bottom wall of the connecting box; The third connecting member includes a universal joint and a second piston shaft. The top of the universal joint is in a spherical structure and is rotatably arranged between the inner walls of the spherical cavity. One end of the second piston shaft always slides between the inner walls of the universal joint, and the bottom end of the second piston shaft is fixedly connected to the top end of the bushing. A connecting groove is formed in the middle of the bottom of the bushing. The top end of the shock absorber piston rod is installed in the connecting groove through a second fastener. And a rubber strip is bonded to the inner wall of the connecting groove. The second fastener is a set screw; The third elastic component includes a second fixed cylinder and a third piston shaft. One end of the second fixed cylinder is fixed to the side wall of the connecting box. One end of the third piston shaft is in a "T" - shaped structure and is fixed to the side wall of the rotating member facing the connecting box. The other end of the third piston shaft always slides between the inner walls of the second fixed cylinder. And a third spring is arranged outside the third piston shaft. The third spring is located between the end face of the second fixed cylinder and the "T" - shaped end of the third piston shaft.

[0013] In one embodiment, when the shock absorber piston rod drives the connecting box to move in the plane where the connecting box is located, the third piston shaft and the second fixed cylinder will approach or move away from each other with the change of the position of the connecting box, so that the adjustment box makes a linear motion along the length direction of the first connecting plate. And during the test, the connecting box will also drive the rotating member to rotate and adjust between the two protrusions through the second elastic component, so that the gear rotates and adjusts synchronously with the rotation of the rotating member; After the pushing block contacts the shock absorber piston rod, since the pushing block does not stop moving immediately at this time, if the shock absorber piston rod becomes loose in the shock absorber cylinder under the action of the electric cylinder, then the connection box will move to the side away from the rotating part, so that the adjustment box will move to the side away from the measuring box driven by the synchronous arm. At this time, the value detected by the distance sensor changes.

[0014] A test method for a test system of the stability of a shock absorber piston rod of a new energy vehicle includes the following steps: S1. First, manually adjust the lengths of the first connecting piece and the second connecting piece according to the test requirements. Fix the shock absorber cylinder vertically between the L-shaped plate and the tab of the upper positioning hole, and use the first fastener to assist in clamping the vertical position of the shock absorber cylinder. First install the shock absorber piston rod in the shock absorber cylinder, then connect the top end of the shock absorber piston rod to the bushing, and use the second fastener to assist in positioning the tightness between the shock absorber piston rod and the bushing; S2. Then, start the first rotating motor and the second rotating motor simultaneously through the operation console, so that the force application assembly and the second cam start to output operations at the same time. The force application assembly controls the elastic vertical process of the lifting seat with a circular reciprocating motion, and the second cam controls the vertical motion of the first output shaft and the second output shaft through the linkage handle and the rotating handle with a circular motion, so as to simulate the relative motion process between the shock absorber cylinder and the shock absorber piston rod when the vehicle encounters bumps or impacts; S3. Then, after the test is completed, start the control power supply through the operation console to make the distance sensor enter the working mode, and start the electric cylinder at the same time, so that the electric cylinder drives the pushing block to move towards the side where the shock absorber piston rod is located. Stop the electric cylinder through the operation console until the pushing block contacts the shock absorber piston rod and remains in a stable non-moving state. Then, according to the distance change measured by the distance sensor during the operation of the electric cylinder, reflect the working stability of the shock absorber piston rod.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are: By setting up an adjustment mechanism, a fixing mechanism, a first connecting mechanism, a second connecting mechanism, etc., the fixing mechanism is used to fix the shock absorber cylinder, the second connecting mechanism is used to fix the top of the shock absorber piston rod, and the bottom end of the shock absorber piston rod is installed in the shock absorber cylinder. Driven by the adjustment mechanism, the shock absorber cylinder and the shock absorber piston rod can simulate the relative motion between the shock absorber piston rod and the shock absorber cylinder when the vehicle encounters bumps or impacts; in addition, a vibration mechanism capable of synchronously driving the adjustment mechanism to move up and down is arranged outside the adjustment mechanism, so that under the action of the vibration mechanism, the vibration feeling generated when the vehicle encounters bumps or impacts can be better simulated. The two cooperate with each other to effectively simulate and test the stability of the shock absorber piston rod. Brief Description of the Drawings

[0016] The following, in conjunction with the drawings, by a detailed description of the specific embodiments of the present application, will make the technical solutions and other beneficial effects of the present application obvious.

[0017] In the drawings: Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the front view structural schematic diagram of the present invention; Figure 3 is the installation structural schematic diagram of the vibration mechanism of the present invention on the machine base; Figure 4 is the structural schematic diagram of the force application component of the present invention; Figure 5 is Figure 4 the longitudinal sectional schematic diagram of Figure 6 is the structural schematic diagram of the adjustment mechanism of the present invention; Figure 7 is the structural schematic diagram of the fixing mechanism of the present invention; Figure 8 is the structural schematic diagram of the first connecting mechanism and the second connecting mechanism of the present invention; Figure 9 is Figure 8 the longitudinal sectional schematic diagram of

[0018] In the figure: 1, machine base; 11, operation table; 2, vibration mechanism; 21, lifting seat; 22, mounting seat; 221, vertical seat; 23, first elastic component; 24, side seat; 25, shaft seat; 251, rotating shaft; 252, synchronous pulley; 26, force application component; 261, first fixing cylinder; 262, first piston shaft; 263, connecting seat; 264, first connecting piece; 265, first cam; 266, connecting rod; 3, adjustment mechanism; 31, vertical plate; 311, second cam; 312, limiting seat; 32, linkage handle; 33, rotating handle; 34, second connecting piece; 341, connecting block; 35, first output shaft; 36, second output shaft; 4, fixing mechanism; 41, fixing frame; 411, guiding block; 412, tab; 413, limiting block; 414, first fastener; 42, first connecting plate; 421, pushing block; 43, L-shaped plate; 431, guiding shaft; 44, tension spring; 5, first connecting mechanism; 51, second connecting plate; 511, measuring box; 512, protrusion; 52, adjustment box; 521, adjustment block; 53, gear; 54, rotating part; 6, second connecting mechanism; 61, connecting box; 62, shaft sleeve; 63, third connecting piece; 631, universal part; 632, second piston shaft; 64, synchronous arm; 65, second elastic component; 651, second fixing cylinder; 652, third piston shaft. Detailed Description of the Invention

[0019] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0020] As Figure 1-2 shown, the present invention provides a technical solution: a test system for the stability performance of the shock absorber piston rod of a new energy vehicle, including a machine base 1, a vibration mechanism 2, an adjustment mechanism 3, a fixing mechanism 4, a connecting mechanism I 5, and a connecting mechanism II 6. An operating platform 11 with a PLC controller is fixedly installed on the machine base 1 at a position near the edge, and a circular cavity is also provided on the machine base 1. Above the circular cavity, a vibration mechanism 2 is installed on the machine base 1. The adjustment mechanism 3 is fixed between the side walls of the vibration mechanism 2. The amplitude adjustment of the adjustment mechanism 3 is controlled by simulating the vibration of the vibration mechanism 2. Among them, a fixing mechanism 4 is connected to one output end of the adjustment mechanism 3. The fixing mechanism 4 is used for fixedly clamping the shock absorber cylinder body. On the other output end of the adjustment mechanism 3, a mutually cooperating connecting mechanism I 5 and a connecting mechanism II 6 are provided. The bottom of the connecting mechanism II 6 is connected to the top of the shock absorber piston rod, and the bottom of the shock absorber piston rod is installed in the shock absorber cylinder body. The relative movement state caused by the up and down movement of the wheels when the vehicle encounters bumps or impacts (i.e., when passing through potholes, speed bumps, or severely bumpy roads) is realized by the movement of the adjustment mechanism 3. At the same time, by cooperating with the setting of the vibration mechanism 2, the vibration environment when the shock absorber piston rod and the shock absorber cylinder body generate relative movement can be better simulated.

[0021] As Figure 1-5 shown, the vibration mechanism 2 includes a lifting seat 21, a mounting seat 22, an elastic component I 23, a side seat 24, a shaft seat 25, and a force application component 26; The lifting seat 21 is of an annular structure. On the inner surface of the lifting seat 21, a mounting seat 22 of a "U" - shaped structure is fixed by bolts. On the top surface of the mounting seat 22, a vertically arranged vertical seat 221 is fixedly installed. A vertical groove is provided in the vertical seat 221, and a vertically arranged vertical shaft is fixed in the vertical groove. A through - hole is also provided through the lifting seat 21.

[0022] There are four sets of the first elastic components 23, and each set of the first elastic components 23 includes a vertical cylinder, a movable shaft, and a first spring. The vertical cylinder is fixed on the machine base 1 in the vertical direction. The top of the movable shaft is fixedly connected to the bottom wall of the lifting seat 21, and the bottom end of the movable shaft always slides between the inner walls of the vertical cylinder. The first spring is installed outside the movable shaft and is arranged between the top surface of the vertical cylinder and the bottom wall of the lifting seat 21.

[0023] It should be further noted that as the lifting seat 21 continuously moves back and forth in the vertical direction, when it moves downward, it will apply a force to the first spring and compress it. At the same time, the bottom end of the movable shaft slides downward along the inner wall of the vertical cylinder for adjustment. On the contrary, when it moves upward, the first spring applies a reverse force to the lifting seat 21, and the movable shaft moves upward synchronously with the upward moving lifting seat 21.

[0024] There are two side seats 24 symmetrically arranged and are respectively fixedly installed on the outer surface of the lifting seat 21. Below the side seats 24, two relatively arranged shaft seats 25 are fixedly installed on the top surface of the machine base 1. A force applying component 26 is also arranged between the side seat 24 and the shaft seat 25 on the same side.

[0025] Among them, the force applying component 26 includes a first fixed cylinder 261, a first piston shaft 262, a connecting seat 263, a first connecting piece 264, a first cam 265, and a connecting rod 266; The top end of the first fixed cylinder 261 is fixed in the middle of the bottom wall of the side seat 24, and the top end of the connecting rod 266 is also fixed on the bottom wall of the side seat 24, and the connecting rod 266 is located in the middle position inside the first fixed cylinder 261. Two relatively distributed first guide grooves are formed on the inner wall of the first fixed cylinder 261. The top end of the first piston shaft 262 always slides between the inner walls of the first fixed cylinder 261, and two relatively arranged first guide blocks are fixedly installed on the circumferential surface of the first piston shaft 262. The first guide blocks slide between the inner walls of the first guide grooves on the same side. Moreover, a hollow inner cavity is formed inside the first piston shaft 262. The bottom end of the connecting rod 266 penetrates and extends into the inner cavity, and a limiting part is fixedly installed on the bottom end of the connecting rod 266. The longitudinal section of the limiting part is an isosceles trapezoid, and the limiting part can contact and slide with the inner wall of the inner cavity. A second spring is sleeved outside the connecting rod 266. The top end of the second spring is fixed on the top wall of the inner cavity, and its bottom end abuts against the upper surface of the limiting part.

[0026] Two adjacent axle seats 25 are each rotatably provided with a first cam 265 on their opposing side walls via a rotating shaft 251. A second connecting shaft is fixedly installed between the two first cams 265. The connecting seat 263 is arranged in a "U" shape and its top wall is fixedly connected to the bottom end of the first piston shaft 262. A first connecting shaft is fixedly installed between the opposing side walls of the connecting seat 263. The first connecting member 264 includes two first connecting ends and a first connecting screw. The two first connecting ends are respectively rotatably provided at the middle positions of the first connecting shaft and the second connecting shaft. The first connecting screw is installed between the two first connecting ends by means of a threaded connection and the exposed length of the first connecting screw is adjustable.

[0027] Among them, a first rotating motor is also provided outside one of the axle seats 25. The first rotating motor and the first cam 265 opposite thereto are connected by a shaft and drive it (that is, the output shaft of the first rotating motor is connected to the rotating shaft 251 connected to the first cam 265). A motor base 1 is installed at the bottom of the first rotating motor. The motor base 1 is fixed on the machine base 1. Moreover, synchronous pulleys 252 are respectively installed on the side walls of two opposing axle seats 25 located on both sides of the circular cavity. A synchronous belt is connected between the two synchronous pulleys 252, and the synchronous pulley 252 on the same side is coaxially connected to the cam (that is, the two are installed on the same rotating shaft 251).

[0028] It should be further noted that by starting the first rotating motor and controlling the rotation of the first cam 265 connected thereto, the two opposing first cams 265 rotate synchronously in a circular motion. Under the action of the first connecting member 264, the connecting seat 263 is driven to move up and down continuously. The connecting seat 263 synchronously drives the first piston shaft 262 to move up and down. As the first piston shaft 262 moves vertically within the first fixed cylinder 261, the first piston shaft 262 continuously exerts a force on the second spring on the connecting rod 266. When the first guide block slides to the bottom end of the first guide groove, it can drive the first fixed cylinder 261 to move downward, thereby synchronously driving the lifting seat 21 to move downward through the side seat 24. When the lifting seat 21 moves to the lowest position and starts to move upward, at this time, the first spring exerts an upward thrust on the lifting seat 21. At the same time, the second spring also exerts an upward thrust on the first piston shaft 262. With the upward driving force of the first connecting member 264, the connecting seat 263 and the second piston shaft 632 move upward accordingly, using the cooperation of the first spring and the second spring to control the vibration simulation effect of the lifting seat 21 in the vertical direction.

[0029] In addition, during this process, due to the threaded connection relationship of the first connecting screw between the two first connecting ends, by manually adjusting the connection length between the first connecting screw and the upper first connecting end (the connection length between the first connecting screw and the lower first connecting end can be adjusted as needed, generally not adjusted), the initial height position of the connecting seat 263 can be adjusted, and thus the movement range during the vibration simulation process can be adjusted.

[0030] As Figure 1-2 and Figure 6 shown, the adjusting mechanism 3 includes a vertical plate 31, a linkage handle 32, a rotating handle 33, a second connecting member 34, a first output shaft 35 and a second output shaft 36; The vertical plate 31 is fixedly installed between the side walls of the mounting seat 22 by bolts, and the vertical plate 31 is always located in the vertical area of the circular cavity. A circular groove is provided at a position near the bottom end of the vertical plate 31. A second cam 311 is rotatably arranged in the circular groove through a shaft. A second rotating motor (not shown in the figure) for driving the second cam 311 is installed on the other side wall of the vertical plate 31. Two limiting seats 312 are fixedly installed on one of the vertical side walls of the vertical plate 31. The first output shaft 35 and the second output shaft 36 respectively penetrate and slide between the inner walls of the two limiting seats 312, and connecting blocks 341 are fixedly connected to the bottom ends of the first output shaft 35 and the second output shaft 36. The connecting blocks 341 move linearly in the vertical direction.

[0031] The rotating handle 33 is rotatably arranged on the side wall of the vertical plate 31 by means of shaft connection. One end of the linkage handle 32 is rotatably connected to one end of the rotating handle 33 by means of shaft connection, and the other end of the linkage handle 32 is also rotatably connected to the end of the second cam 311 by means of shaft connection. Moreover, the circular motion of the second cam 311 can drive the reciprocating swing of the rotating handle 33 through the linkage of the linkage handle 32.

[0032] The second connecting member 34 includes two second connecting ends and a second connecting screw. One of the second connecting ends on the same second connecting member 34 is connected to the contacting connecting block 341 by means of shaft connection and rotation, and the other second connecting end is rotatably connected to the rotating handle 33 by means of shaft connection. The second connecting screw is installed between the two second connecting ends by means of threaded connection (in this embodiment, the length of the second connecting member 34 needs to be adjusted appropriately according to the test conditions). Moreover, the linkage handle 32 and the second connecting end jointly installed on the end of the rotating handle 33 are also coaxially connected (they are respectively located on both sides of the end of the rotating handle 33).

[0033] Among them, when Figure 6 the right end of the rotating handle 33 moves from the lowest position to the highest position, the movement trajectory of the end of the linkage handle 32 far from the rotating handle 33 (i.e., the end connected to the second cam 311) exactly conforms to the circular trajectory of the second cam 311, and the movement states of the rotating handle 33 and the second cam 311 will not be interfered by the movement of the linkage handle 32.

[0034] It should be further noted that by starting the second rotating motor to drive the second cam 311 to perform circular motion in the circular groove (in this embodiment, according to Figure 6rotates counterclockwise as shown. As the cam two 311 rotates, the reciprocating swinging motion of the rotating handle 33 is controlled through the cooperation of the linkage handle 32. Through the cooperation of the two connecting parts 34 on both sides, during the reciprocating swing of the rotating handle 33, the movements of the output shaft one 35 and the output shaft two 36 are controlled. When Figure 6 the left end of the rotating handle 33 shown is higher than the right end, at this time, the first connecting plate 42 and the second connecting plate 51 are far away from each other. When Figure 6 the left end of the rotating handle 33 shown is lower than the right end, at this time, the first connecting plate 42 and the second connecting plate 51 are close to each other, so as to control the relative movement state between the simulated shock absorber cylinder and the shock absorber piston rod when encountering bumps or impacts.

[0035] As Figure 1-2 well as Figure 7 shown, the fixing mechanism 4 includes a fixing frame 41, a first connecting plate 42, an L-shaped plate 43 and a tension spring 44; The fixing frame 41 is arranged in a "U" shape, and a vertically penetrating positioning hole is opened on the fixing frame 41. A plurality of tabs 412 integrally connected with the fixing frame 41 are also arranged in the upper positioning hole. And two relatively arranged limiting blocks 413 (arc mechanism) and two fastening parts one 414 (fastening screws in this embodiment) are elastically arranged in the positioning hole. A horizontally arranged guide block 411 (in a "convex" shape) is fixedly installed on one of the vertical side walls of the fixing frame 41. One end of the guide block 411 slides between the inner walls of the vertical groove. The vertical shaft penetrates through the guide block 411 and is in sliding contact with it. Above the guide block 411, a horizontally arranged first connecting plate 42 is also fixedly installed on the side wall of the fixing frame 41. The other end of the first connecting plate 42 is fixed on the top end of the output shaft two 36. An electric cylinder is fixedly installed on the first connecting plate 42 along its length direction. A push block 421 is connected to the moving end of the electric cylinder. The side wall of the push block 421 facing the shock absorber piston rod is arranged as an arc surface.

[0036] An L-shaped plate 43 is arranged at the bottom of the fixing frame 41. One end of the L-shaped plate 43 always slides and adjusts along the inner wall of the fixing frame 41. A first connecting bolt and a second connecting bolt are respectively installed on the same side side walls of the fixing frame 41 and the L-shaped plate 43. The tension spring 44 is installed between the first connecting bolt and the second connecting bolt, and the tension spring 44 is always telescopically adjusted in the vertical direction. A guide shaft 431 is also fixedly installed on the bottom wall of the L-shaped plate 43. The guide shaft 431 penetrates through and slides between the inner walls of the through hole, and a limiting boss is fixedly connected to the bottom end of the guide shaft 431. The limiting boss is always located below the through hole.

[0037] It should be further noted that when fixing the shock absorber cylinder body, its bottom end is passed through the positioning hole below the fixing frame 41 and pressed downward against the L-shaped plate 43 to keep it in a vertical state so that the shock absorber cylinder body is completely located between the two positioning holes of the fixing frame 41. Subsequently, it is continuously adjusted until the top end of the shock absorber cylinder body contacts the lug 412. At this time, the limiting block 413 in the positioning hole is tightly attached to the outer surface of the shock absorber cylinder body under the elastic action. Then, the fastener one 414 is tightened to the surface of the shock absorber cylinder body, thereby fixing the shock absorber cylinder body on the fixing frame 41, and the shock absorber piston rod is installed in the shock absorber cylinder body in its normal working state.

[0038] Since the output shaft two 36 is connected to the fixing mechanism 4, when the output shaft two 36 reciprocates up and down, the fixing mechanism 4 will also drive the shock absorber cylinder body to move up and down together.

[0039] As Figure 1-2 and Figure 8-9 shown, the connecting mechanism one 5 includes a connecting plate two 51, an adjusting box 52, a gear 53, and a rotating member 54; One end of the connecting plate two 51 is fixed to the top end of the output shaft one 35, and a support frame is also fixedly installed on the output shaft one 35, and the top end of the support frame is fixed to the bottom wall of the connecting plate two 51. A through hole two is opened along the length direction of the connecting plate two 51. A measuring box 511 is fixedly installed on the top surface of the connecting plate two 51. A control power supply is installed on one side inside the measuring box 511, and a distance sensor is installed on the surface of one side wall of the measuring box 511. The distance sensor is disposed opposite to the adjusting box 52. The control power supply controls and drives the distance sensor, and both the control power supply and the distance sensor are connected to the PLC controller through electrical signals.

[0040] The other end of the connecting plate two 51 has a "U" - shaped structure, and arc - shaped protrusions 512 are respectively fixed on the opposite side walls at this end. A rotating member 54 is rotatably arranged between the side walls of the "U" - shaped end of the connecting plate two 51. The rotating member 54 has an arc - shaped strip - like structure. A gear 53 is also rotatably arranged on the top surface of the connecting plate two 51 by means of a shaft connection. A plurality of tooth grooves are opened on the outer surface of the rotating member 54 facing the gear 53. The gear 53 meshes with the tooth grooves for transmission, and arc - shaped grooves matching the protrusions 512 are opened on both the top surface and the bottom surface of the rotating member 54.

[0041] The adjusting box 52 penetrates and slides on the connecting plate two 51 and moves along the length direction of the connecting plate two 51. A groove is opened along the length direction of the adjusting box 52. A transverse shaft is fixed in the groove. An adjusting block 521 is slidably arranged between the inner walls of the groove. The transverse shaft penetrates through the adjusting block 521 and is in sliding contact with it.

[0042] It should be further noted that when the rotating member 54 is rotationally adjusted under the action of the second connecting mechanism 6, under the cooperation and limitation of the protrusion 512 and the arc-shaped groove, the rotating member 54 will drive the rotation of the gear 53 meshed therewith. At the same time, driven by the second connecting mechanism 6, the synchronous arm 64 at the top drives the adjusting block 521 to move and adjust in the adjusting box 52. When the connecting box 61 moves along the length direction of the second connecting plate 51, the synchronous arm 64 will drive the adjusting box 52 to move and adjust along the length direction of the second connecting plate 51 through the adjusting block 521. When the connecting box 61 moves in other ways, the synchronous arm 64 will drive the adjusting block 521 to move along the length direction of the adjusting box 52 and at the same time drive the adjusting box 52 to move and adjust along the length direction of the second connecting plate 51.

[0043] The second connecting mechanism 6 includes a connecting box 61, a bushing 62, a third connecting member 63, a synchronous arm 64 and a second elastic component 65; A spherical cavity is formed in the middle of the bottom of the connecting box 61. A connecting groove is formed in the middle of the bottom of the bushing 62. A rubber strip is bonded to the inner wall of the connecting groove. The top end of the shock absorber piston rod is fixed in the connecting groove. The rubber strip is used to improve the connection between the shock absorber piston rod and the bushing 62. A plurality of second fasteners (fastening screws in this embodiment) for fixing the top end of the shock absorber piston rod are installed on the bushing 62 by means of threaded connection. A "T"-shaped third connecting bolt is fixedly installed on the top surface of the connecting box 61. One end of the synchronous arm 64 is fixed on the third connecting bolt, and the other end thereof is movably arranged through a shaft connection with the top surface of the adjusting block 521.

[0044] The third connecting member 63 includes a universal joint 631 and a second piston shaft 632. One end of the universal joint 631 is spherical and always rotates in the spherical cavity of the connecting box 61. The bottom end of the second piston shaft 632 is fixedly connected to the top surface of the bushing 62. Two second guide blocks are fixedly installed on the outer circumferential surface of the top end of the second piston shaft 632. A second guide groove is formed in the universal joint 631 along its length direction, and the second guide blocks slide between the inner walls of the second guide groove.

[0045] The second elastic component 65 is arranged between the side wall of the connection box 61 opposite to the rotating member 54. The second elastic component 65 includes a second fixed cylinder 651 and a third piston shaft 652. One end of the second fixed cylinder 651 is fixed to the side wall of the connection box 61, and a third guide groove is formed between the inner walls along the length direction of the second fixed cylinder 651. One end of the third piston shaft 652 with a "T" - shaped structure is fixed on the arc surface of the rotating member 54, and the other end always slides between the inner walls of the second fixed cylinder 651. Two oppositely - arranged third guide blocks are fixedly installed on the outer surface of the third piston shaft 652 located inside the second fixed cylinder 651, and the third guide blocks slide between the inner walls of the third guide groove. A third spring is sleeved outside the third piston shaft 652. One end of the third spring is fixed to the end face of the second fixed cylinder 651, and the other end is fixed to the side wall of the "T" - shaped end of the third piston shaft 652.

[0046] It should be further noted that before the test, by placing the top end of the shock absorber piston rod in the connection groove of the bushing 62, the roughness of the rubber strip surface is used to increase the connection stability. At the same time, the fastening effect of the second fastener is assisted to fix the connection between the bushing 62 and the shock absorber piston rod. Since the end of the third connecting member 63 connected to the connection box 61 is a spherical structure, when the shock absorber piston rod loosens and deflects, the connection box 61 can have a displacement movement in its plane (the displacement movement of the connection box 61 is due to the position relationship of the rotating member 54 and the limiting effect of the second elastic component 65).

[0047] When the connection box 61 has a displacement movement along the length direction of the second connecting plate 51, a relative movement in the opposite or same direction will occur between the second fixed cylinder 651 and the third piston shaft 652, causing the third spring to deform. When the connection box 61 has a displacement movement in other directions, such as a displacement movement perpendicular to the length direction of the second connecting plate 51, the connection box 61 will cause the second elastic component 65 to have an elastic movement and also cause the rotating member 54 to rotate at an angle during the displacement, so as to cooperate with its displacement movement in its plane.

[0048] In addition, after the cyclic test is completed, it is necessary to detect the coaxiality between the shock absorber piston rod and the shock absorber cylinder. During the detection, only start the electric cylinder to drive the push block 421 to move towards the side close to the shock absorber piston rod until it contacts the shock absorber piston rod and then manually stop the electric cylinder when it remains stable. At the same time, start the control power supply synchronously when starting the electric cylinder so that the distance sensor enters the working mode to detect the straight-line distance between the adjustment box 52 and the distance sensor itself. If the coaxiality between the shock absorber piston rod and the shock absorber cylinder remains unchanged all the time, the distance value should remain unchanged all the time. On the contrary, when the distance value changes, it indicates that the shock absorber piston rod has become loose in the shock absorber cylinder, so that after the push block 421 contacts the shock absorber piston rod, the shock absorber piston rod is subjected to a force and deflects to one side.

[0049] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection, an electrical connection or can communicate with each other; it can be directly connected, the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the meanings of the above terms in the present application can be understood according to specific situations.

[0050] The above has introduced in detail the test system and its test method for the stability performance of the shock absorber piston rod of a new energy vehicle provided by the embodiments of the present application. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A test system for the stability performance of a shock absorber piston rod of a new energy vehicle, comprising: A base (1), on which an operating platform (11) with a PLC controller is provided, and a circular cavity is formed on the base (1); It is characterized in that it further comprises: A vibration mechanism (2), which is arranged along the vertical direction on the periphery of the circular cavity, and the vibration mechanism (2) provides a vibration feeling generated when the vehicle encounters bumps or impacts in an elastic reciprocating linear motion manner; An adjusting mechanism (3), which is fixed between the side walls of the vibration mechanism (2), and the adjusting mechanism (3) moves vertically above the circular cavity. An output shaft one (35) and an output shaft two (36) with opposite movement directions are arranged on the adjusting mechanism (3); A fixing mechanism (4), which is connected to the top end of the output shaft two (36) and moves synchronously therewith, and a shock absorber cylinder is clamped on the fixing mechanism (4); A connecting mechanism one (5), which is connected to the top end of the output shaft one (35) and moves synchronously therewith; A connecting mechanism two (6), which is elastically connected to the connecting mechanism one (5), and a shock absorber piston rod is arranged at the bottom of the connecting mechanism two (6), and the bottom end of the shock absorber piston rod is installed in the shock absorber cylinder.

2. The test system for the stability performance of the shock absorber piston rod of a new energy vehicle according to claim 1, characterized in that, The vibration mechanism (2) includes a lifting seat (21), a first elastic component (23), side seats (24) and shaft seats (25). The lifting seat (21) is arranged in a circular ring structure, and a "U"-shaped mounting seat (22) is fixed on the inner surface of the lifting seat (21). There are two side seats (24) and they are symmetrically installed on the outer surface of the lifting seat (21). There are four groups of first elastic components (23) and they are all installed between the bottom wall of the lifting seat (21) and the top surface of the base (1); Two relatively distributed shaft seats (25) are arranged on the base (1) below the side seats (24). A first rotating motor is installed on the base (1) outside one of the shaft seats (25), and synchronous wheels (252) are rotatably arranged on the same side side walls of two relatively located shaft seats (25) on both sides of the circular cavity. The two synchronous wheels (252) are connected by a synchronous belt, and one of the synchronous wheels (252) rotates driven by the first rotating motor.

3. The test system for the stability performance of the shock absorber piston rod of a new energy vehicle according to claim 2, characterized in that, The vibration mechanism (2) further comprises a force application component (26), and the force application component (26) includes a first fixed cylinder (261), a first piston shaft (262), a connecting seat (263), a first connecting piece (264), a first cam (265) and a connecting rod (266). The top ends of the first fixed cylinder (261) and the connecting rod (266) are both fixed on the bottom wall of the side seat (24). The connecting rod (266) is located in the middle of the first fixed cylinder (261), and a limiting part is arranged at the bottom end of the connecting rod (266), and the longitudinal section of the limiting part is an isosceles trapezoid; The top end of the first piston shaft (262) always slides between the inner walls of the first fixed cylinder (261). An inner cavity is provided inside the first piston shaft (262). The connecting rod (266) penetrates and extends into the inner cavity, and the limiting part always slides between the inner walls of the inner cavity. A second spring is arranged outside the connecting rod (266) located in the inner cavity, and the second spring is located between the top wall of the limiting part and the top wall of the inner cavity; The connecting seat (263) is fixed to the bottom end of the first piston shaft (262). One end of the first connecting piece (264) is connected to the connecting seat (263) by a shaft connection, and the two sides of the other end are connected to the first cam (265) by shaft connections. The length of the first connecting piece (264) can be manually adjusted by means of a threaded connection. The other end of the first cam (265) is connected to a rotating shaft (251), and the other end of the rotating shaft (251) rotates between the inner walls of the shaft seat (25); Among them, the output shaft of the first rotating motor is connected to one of the rotating shafts (251) and drives it. Two synchronous pulleys (252) are respectively arranged on one of the rotating shafts (251) close to it.

4. The test system for the stability performance of the shock absorber piston rod of a new energy vehicle according to claim 3, wherein, The adjusting mechanism (3) further includes a vertical plate (31), a linkage handle (32), a rotating handle (33) and a second connecting piece (34). The vertical plate (31) is fixed between the side walls of the mounting seat (22) in the vertical direction. A second cam (311) is rotatably arranged on one side wall of the vertical plate (31), and a second rotating motor for driving the second cam (311) is installed on the other side wall of the vertical plate (31); The rotating handle (33) is rotatably arranged on one side wall of the vertical plate (31) by a shaft connection, and one end of the rotating handle (33) is connected to the second cam (311) by a shaft connection with the linkage handle (32). Two limiting seats (312) are arranged on the side wall of the vertical plate (31). The first output shaft (35) and the second output shaft (36) respectively penetrate the limiting seats (312) and move and adjust in the vertical direction. Connecting blocks (341) are arranged at the bottom ends of the first output shaft (35) and the second output shaft (36). Two second connecting pieces (34) are arranged and are respectively arranged between the connecting blocks (341) on the same side and the end of the rotating handle (33). The length of the second connecting piece (34) can be adjusted, and the movements of the second cam (311) and the rotating handle (33) do not interfere with each other.

5. The test system for the stability performance of the shock absorber piston rod of a new energy vehicle according to claim 4, characterized in that, The fixing mechanism (4) includes a fixing frame (41), a first connecting plate (42), an L-shaped plate (43) and a tension spring (44). The fixing frame (41) has a "U" - shaped structure and positioning holes are provided at its top end and bottom end. Two arc - shaped limiting blocks (413) with elastic adjustment and two fastening pieces one (414) connected by threads are arranged in the positioning holes. The fastening piece one (414) is a set screw, and a plurality of tabs (412) are also arranged in the positioning hole at the top end of the fixing frame (41); One end of the L-shaped plate (43) always slides vertically between the inner walls of the fixed frame (41), and the tension spring (44) is also connected between the same-side side walls of the L-shaped plate (43) and the fixed frame (41). A guide block (411) with a "convex" structure is installed on one of the vertical side walls of the fixed frame (41). A vertical seat (221) is arranged vertically on the mounting seat (22). A vertical shaft is installed between the inner walls of the vertical seat (221). The guide block (411) slides between the inner walls of the vertical seat (221), and the vertical shaft passes through the guide block (411) and is in sliding contact with it. A guide shaft (431) is also arranged at the bottom end of the L-shaped plate (43). The guide shaft (431) passes through the lifting seat (21) and is slidably arranged with it. A limiting boss that is always located below the lifting seat (21) is also arranged at the bottom end of the guide shaft (431). One end of the first connecting plate (42) is fixed to the top end of the second output shaft (36) and is perpendicular to it. The other end of the first connecting plate (42) is fixed to the side wall of the fixed frame (41). An electric cylinder is installed on the first connecting plate (42). A push block (421) is arranged at the movable end of the electric cylinder. The side wall of the push block (421) facing the shock absorber piston rod is arranged in an arc shape.

6. The test system for the stability performance of the shock absorber piston rod of a new energy vehicle according to claim 5, characterized in that, The first connecting mechanism (5) includes a second connecting plate (51), an adjustment box (52), a gear (53), and a rotating part (54). One end of the second connecting plate (51) is fixed to the top end of the first output shaft (35) and is perpendicular to it. A support frame is also arranged between the bottom end of the second connecting plate (51) and the first output shaft (35). The adjustment box (52) passes through and slides between the inner wall and the top wall of the second connecting plate (51). A groove is opened along the length direction of the adjustment box (52). An adjustment block (521) is slidably arranged between the inner walls of the groove. A transverse shaft that is in sliding contact with it passes through the middle of the adjustment block (521). The transverse shaft is fixed in the groove. A measuring box (511) is also installed on the top wall of the second connecting plate (51). A control power supply and a distance sensor are respectively arranged in the measuring box (511). The distance sensor is arranged opposite to the adjustment box (52). The end of the second connecting plate (51) far from the first output shaft (35) is arranged in a "U" shape, and protrusions (512) are installed on the opposite side walls at this end. The gear (53) is rotatably arranged on the second connecting plate (51) through a shaft. The rotating part (54) is arranged in an arc-shaped strip structure. Arc grooves are opened on the top wall and the bottom wall of the rotating part (54). The protrusions (512) are matched with the arc grooves and can rotate in contact with each other. And tooth grooves are evenly opened on the outer surface of the rotating part (54) facing the gear (53). The gear (53) is meshed with the tooth grooves.

7. The test system for the stability performance of the shock absorber piston rod of a new energy vehicle according to claim 6, characterized in that, The second connecting mechanism (6) includes a connecting box (61), a bushing (62), a third connecting member (63), a synchronous arm (64), and a second elastic component (65). A "T"-shaped third connecting bolt is provided at the top of the connecting box (61). One end of the synchronous arm (64) is fixed to the third connecting bolt, and the other end of the synchronous arm (64) is movably arranged in a shaft connection with the adjusting block (521). A spherical cavity is formed in the middle of the bottom wall of the connecting box (61). The third connecting member (63) includes a universal joint (631) and a second piston shaft (632). The top of the universal joint (631) is spherical and is rotatably arranged between the inner walls of the spherical cavity. One end of the second piston shaft (632) always slides between the inner walls of the universal joint (631), and the bottom end of the second piston shaft (632) is fixedly connected to the top end of the bushing (62). A connecting groove is formed in the middle of the bottom of the bushing (62). The top end of the shock absorber piston rod is installed in the connecting groove through a second fastener, and a rubber strip is bonded to the inner wall of the connecting groove. The second fastener is a set screw. The third elastic component includes a second fixed cylinder (651) and a third piston shaft (652). One end of the second fixed cylinder (651) is fixed to the side wall of the connecting box (61). One end of the third piston shaft (652) is "T"-shaped and is fixed to the side wall of the rotating member (54) facing the connecting box (61). The other end of the third piston shaft (652) always slides between the inner walls of the second fixed cylinder (651), and a third spring is arranged outside the third piston shaft (652). The third spring is located between the end face of the second fixed cylinder (651) and the "T"-shaped end of the third piston shaft (652).

8. The test system for the shock absorber piston rod stability performance of a new energy vehicle according to claim 7, wherein, When the shock absorber piston rod drives the connecting box (61) to move in the plane where the connecting box (61) is located, the third piston shaft (652) and the second fixed cylinder (651) will approach or move away from each other as the position of the connecting box (61) changes, so that the adjusting box (52) moves linearly along the length direction of the first connecting plate (42). And during the test, the connecting box (61) will also drive the rotating member (54) to rotate and adjust between the two protrusions (512) through the second elastic component (65), so that the gear (53) rotates and adjusts synchronously with the rotation of the rotating member (54). When the push block (421) contacts the shock absorber piston rod, since the push block (421) does not stop moving immediately at this time, if the shock absorber piston rod becomes loose in the shock absorber cylinder under the action of the electric cylinder, then the connecting box (61) will move to the side away from the rotating member (54), so that the adjusting box (52) moves to the side away from the measuring box (511) under the drive of the synchronous arm (64). At this time, the value detected by the distance sensor changes.

9. The testing method of the testing system for the stability performance of the shock absorber piston rod of a new energy vehicle according to claim 8, characterized in that, Including the following steps: S1. First, manually adjust the lengths of the first connector (264) and the second connector (34) according to the test requirements. Fix the shock absorber cylinder vertically between the L-shaped plate (43) and the tab (412) of the upper positioning hole, and use the first fastener (414) to assist in clamping the vertical position of the shock absorber cylinder. Install the shock absorber piston rod into the shock absorber cylinder first, then connect the top end of the shock absorber piston rod to the bushing (62), and use the second fastener to assist in positioning the tightness between the shock absorber piston rod and the bushing (62). S2. Next, start the first rotation motor and the second rotation motor simultaneously through the operation console (11), so that the force application assembly (26) and the second cam (311) start to output operations at the same time. The force application assembly (26) controls the elastic vertical process of the lifting seat (21) with a circular reciprocating motion, and the second cam (311) controls the vertical motion of the first output shaft (35) and the second output shaft (36) through the linkage handle (32) and the rotating handle (33) with a circular motion, thereby simulating the relative motion process between the shock absorber cylinder and the shock absorber piston rod when the vehicle encounters bumps or impacts. S3. Then, after the test, start the control power supply through the operation console (11) to make the distance sensor enter the working mode, and start the electric cylinder at the same time, so that the electric cylinder drives the push block (421) to move towards the side where the shock absorber piston rod is located. Stop the electric cylinder through the operation console (11) until the push block (421) contacts the shock absorber piston rod and remains in a stable stationary state. After that, reflect the working stability of the shock absorber piston rod according to the distance change measured by the distance sensor during the operation of the electric cylinder.

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