Test system and method for stability performance of shock absorber piston rod of new energy vehicle

Abstract

The present application relates to the technical field of shock absorber piston rod, especially to a new energy vehicle shock absorber piston rod stability performance test system and test method, which solves the shortcomings of the prior art. The test system comprises a machine base, a vibration mechanism, an adjusting mechanism, a fixing mechanism, a connecting mechanism one and a connecting mechanism two. The machine base is provided with an operation table with a PLC controller, and 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 provides a simulated vibration feeling when the vehicle encounters bumps or impacts in the form of reciprocating linear elastic movement. The adjusting mechanism is fixed between the side walls of the vibration mechanism and moves above the circular cavity in the vertical direction. Output shaft one and output shaft two with opposite movement directions are arranged on the adjusting mechanism. Compared with the prior art, the present application can effectively simulate the stability performance test of the shock absorber piston rod.

Description

Technical Field

[0001] This invention relates to the field of shock absorber piston rod technology, and in particular to a testing system and method for testing the stability performance of shock absorber piston rods in new energy vehicles. Background Technology

[0002] Shock absorbers, as a crucial component of the automotive suspension system, primarily function to dampen road impacts, suppress vehicle vibrations, and improve ride comfort and handling stability. The piston rod, as the core moving part of the shock absorber, directly affects its performance and lifespan. Insufficient piston rod stability can lead to the following problems, including but not limited to: 1. Causes abnormal noises and oil leaks in the shock absorber, reducing ride comfort; 2. Affects vehicle handling stability, increasing driving safety hazards; 3. Shortens the shock absorber's lifespan, increasing user operating costs.

[0003] Currently, testing methods for the stability performance of shock absorber piston rods mainly rely on traditional bench tests and road tests. These traditional methods primarily focus on the static performance of the piston rod, making it difficult to comprehensively assess its dynamic stability. For shock absorber piston rod performance testing, more specific assessments are based on phenomena occurring during driving on dynamic road surfaces. For example, when a vehicle encounters bumps or impacts (i.e., passing over potholes, speed bumps, or severely bumpy roads), the wheel moves upward, pushing the shock absorber to compress, and the piston rod experiences a downward axial force. Conversely, when the wheel moves downward, the shock absorber rebounds, and the piston rod experiences an upward axial force. In this dynamic process, the movement between the shock absorber piston rod and the cylinder is relative. However, current testing equipment cannot be applied to this specific testing.

[0004] Therefore, we propose a testing system and method for the stability performance of shock absorber piston rods in new energy vehicles to address the aforementioned problems. Summary of the Invention

[0005] The purpose of this invention is to provide a testing system and method for testing the stability performance of shock absorber piston rods in new energy vehicles, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] A testing system for the stability performance of shock absorber piston rods in new energy vehicles includes a base, a vibration mechanism, an adjustment mechanism, a fixing mechanism, a first connecting mechanism, and a second connecting mechanism. The base is equipped with an operating table with a PLC controller, and a circular cavity is formed on the base.

[0008] The vibration mechanism is arranged vertically around the circular cavity, and the vibration mechanism provides the vibration sensation that a vehicle experiences when it encounters bumps or impacts through reciprocating linear elastic motion.

[0009] The adjustment mechanism is fixed between the side walls of the vibration mechanism, and the adjustment mechanism moves vertically above the circular cavity. The adjustment mechanism is provided with an output shaft one and an output shaft two with opposite directions of movement.

[0010] The fixing mechanism is connected to the top end of the second output shaft and moves synchronously therewith, and the shock absorber cylinder is clamped on the fixing mechanism;

[0011] The connecting mechanism is connected to the top end of the output shaft and moves synchronously therewith;

[0012] The second connecting mechanism is elastically connected to the first connecting mechanism, and a shock absorber piston rod is provided at the bottom of the second connecting mechanism, with the bottom end of the shock absorber piston rod installed inside the shock absorber cylinder.

[0013] In one embodiment, the vibration mechanism includes a lifting seat, an elastic component one, side seats, and a shaft seat. The lifting seat is arranged in a circular structure, and a "U"-shaped mounting seat is fixed on the inner surface of the lifting seat. Two side seats are provided and symmetrically installed on the outer surface of the lifting seat. Four sets of elastic components one are provided and are all installed between the bottom wall of the lifting seat and the top surface of the machine base.

[0014] Below the side seat, two oppositely distributed bearing seats are provided on the machine base. A rotary motor is also installed on the outer side of one of the bearing seats on the machine base. Synchronous pulleys are rotatably provided on the same side wall of the two opposite bearing seats located on both sides of the circular cavity. The two synchronous pulleys are connected by a synchronous belt, and one of the synchronous pulleys rotates with the drive of the rotary motor.

[0015] In one embodiment, the vibration mechanism further includes a force-applying component, which includes a fixed cylinder, a piston shaft, a connecting seat, a connecting piece, a cam, and a connecting rod. The top ends of the fixed cylinder and the connecting rod are fixed to the bottom wall of the side seat. The connecting rod is located in the middle of the fixed cylinder and a limiting part is provided at the bottom end of the connecting rod. The longitudinal section of the limiting part is an isosceles trapezoid.

[0016] The top end of piston shaft one always slides between the inner walls of fixed cylinder one, and an inner cavity is opened inside piston shaft one. The connecting rod passes through and extends into the inner cavity, and the limiting part always slides between the inner walls of the inner cavity. A spring two is provided outside the connecting rod located in the inner cavity. The spring two is located between the top wall of the limiting part and the top wall of the inner cavity.

[0017] The connecting seat is fixed on the bottom end of the piston shaft. One end of the connecting piece is connected to the connecting seat via a shaft, and the two sides of its other end are connected to the cam. The length of the connecting piece can be manually adjusted by means of a threaded connection. The other end of the cam is connected to a rotating shaft, and the other end of the rotating shaft rotates between the inner walls of the shaft seat.

[0018] The output shaft of the rotary motor is connected to and drives one of the rotating shafts, and two synchronous pulleys are respectively set on one of the rotating shafts that is close to it.

[0019] In one embodiment, the adjustment mechanism further includes a vertical plate, a linkage handle, a rotating handle, and a second connecting member. The vertical plate is fixed vertically between the side walls of the mounting base. A second cam is rotatably mounted on one side wall of the vertical plate, and a second rotary motor for driving the second cam is mounted on the other side wall of the vertical plate.

[0020] The rotating handle is rotatably mounted on one side wall of the vertical plate via a shaft connection, and a linkage handle is provided between one end of the rotating handle and the second cam via a shaft connection. Two limit seats are provided on the side wall of the vertical plate. Output shaft one and output shaft two pass through the limit seats and move and adjust in the vertical direction. A connecting block is provided at the bottom end of output shaft one and output shaft two. Two connecting parts two are provided and are respectively located between the connecting block on the same side and the end of the rotating handle. The length of the connecting parts two can be adjusted, and the movement of the second cam and the rotating handle do not interfere with each other.

[0021] In one embodiment, the fixing mechanism includes a fixing frame, a connecting plate, an L-shaped plate, and a tension spring. The fixing frame has a "U" shaped structure and positioning holes are provided at its top and bottom. Two elastically adjustable arc-shaped limiting blocks and two fasteners connected by threads are provided in the positioning holes. The fasteners are set screws, and multiple protrusions are also provided in the positioning holes at the top of the fixing frame.

[0022] One end of the L-shaped plate always slides vertically between the inner walls of the fixed frame, and a tension spring is connected between the L-shaped plate and the side wall of the fixed frame on the same side. A guide block with a "convex" structure is installed on one vertical side wall of the fixed frame. A vertical seat is provided on the mounting base in the vertical direction. A vertically arranged vertical shaft is installed between the inner walls of the vertical seat. The guide block slides between the inner walls of the vertical seat, and the vertical shaft passes through the guide block and slides in contact with it. A guide shaft is also provided at the bottom end of the L-shaped plate. The guide shaft passes through the lifting seat and slides with it. A limiting boss that is always located below the lifting seat is also provided at the bottom end of the guide shaft.

[0023] One end of the connecting plate is fixed to the top of the output shaft and is perpendicular to it. The other end of the connecting plate is fixed to the side wall of the fixing frame. An electric cylinder is installed on the connecting plate. A push block is provided on the movable end of the electric cylinder. The push block is arranged in an arc shape facing the side wall of the shock absorber piston rod.

[0024] In one embodiment, the connecting mechanism includes a connecting plate 2, an adjusting box, a gear, and a rotating component. One end of the connecting plate 2 is fixed to the top of the output shaft 1 and is perpendicular to it. A support frame is also provided between the bottom end of the connecting plate 2 and the output shaft 1. The adjusting box passes through and slides between the inner wall and the top wall of the connecting plate 2. A groove is provided along the length of the adjusting box. An adjusting block is slidably arranged between the inner walls of the groove. A transverse shaft passes through the middle of the adjusting block and slides in contact with it. The transverse shaft is fixed in the groove. A measuring box is also installed on the top wall of the connecting plate 2. A control power supply and a distance sensor are respectively provided in the measuring box. The distance sensor is arranged opposite to the adjusting box.

[0025] The end of the connecting plate two away from the output shaft one is set in a "U" shape and protrusions are installed on the opposite side walls of this end. The gear is rotatably mounted on the connecting plate two through a shaft connection. The rotating part is set in an arc-shaped strip structure. Arc grooves are opened on the top and bottom walls of the rotating part. The protrusions match the arc grooves and can rotate in contact with them. Tooth grooves are evenly opened on the outer surface of the rotating part facing the gear, and the gear is meshed with the tooth grooves.

[0026] In one embodiment, the second connecting mechanism includes a connecting box, a bushing, a third connecting piece, a synchronizing arm, and a second elastic component. The top of the connecting box is provided with a "T"-shaped connecting bolt, one end of the synchronizing arm is fixed to the third connecting bolt, and the other end of the synchronizing arm is movably connected to the adjusting block via a shaft. A spherical cavity is provided in the middle of the bottom wall of the connecting box.

[0027] The connecting component three includes a universal joint and a piston shaft two. The top of the universal joint is spherical and rotatably disposed between the inner walls of the spherical cavity. One end of the piston shaft two always slides between the inner walls of the universal joint, and the bottom end of the piston shaft two is connected and fixed to the top end of the bushing. A connecting groove is provided in the middle of the bottom of the bushing. The top end of the shock absorber piston rod is installed in the connecting groove by fastener two, and a rubber strip is adhered to the inner wall of the connecting groove. Fastener two is a set screw.

[0028] The elastic component three includes a fixed cylinder two and a piston shaft three. One end of the fixed cylinder two is fixed to the side wall of the connecting box. One end of the piston shaft three has a "T" shape and is fixed to the side wall of the rotating part facing the connecting box. The other end of the piston shaft three always slides between the inner walls of the fixed cylinder two. A spring three is provided on the outside of the piston shaft three. The spring three is located between the end face of the fixed cylinder two and the "T"-shaped end of the piston shaft three.

[0029] 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 piston shaft three and the fixed cylinder two will move closer or further away from each other as the position of the connecting box changes, thereby causing the adjusting box to move linearly along the length direction of the connecting plate one. Furthermore, during the test, the connecting box will also drive the rotating part to rotate and adjust between the two protrusions through the elastic component two, thereby causing the gear to rotate synchronously with the rotation of the rotating part.

[0030] When the push block contacts the piston rod of the shock absorber, the push block does not stop moving immediately. If the piston rod of the shock absorber becomes loose inside the shock absorber cylinder under the action of the electric cylinder, the connecting box will move away from the rotating part. This causes the adjusting box to move away from the measuring box under the drive of the synchronous arm. At this time, the value detected by the distance sensor changes.

[0031] The test method for the stability performance testing system of shock absorber piston rods in new energy vehicles includes the following steps:

[0032] S1. First, manually adjust the lengths of connector one and connector two according to the test requirements. Fix the shock absorber cylinder vertically between the L-shaped plate and the convex piece of the upper positioning hole. Use fastener one 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 of the shock absorber piston rod to the bushing. Use fastener two to assist in positioning the tightness between the shock absorber piston rod and the bushing.

[0033] S2. Next, start rotary motor one and rotary motor two simultaneously through the control panel, so that the force application component and cam two start to output work at the same time. The force application component controls the elastic vertical process of the lifting seat with the reciprocating motion of the circle. Cam two controls the vertical movement of output shaft one and output shaft two through the linkage handle and the rotating handle with the circular motion, thereby simulating the relative movement process between the shock absorber cylinder and the shock absorber piston rod when the vehicle encounters bumps or impacts.

[0034] S3. After the test, start the control power through the control panel to put the distance sensor into working mode and start the electric cylinder at the same time. The electric cylinder will drive the push block to move towards the side where the shock absorber piston rod is located until the push block contacts the shock absorber piston rod and remains stable. Then, stop the electric cylinder through the control panel. After that, the working stability of the shock absorber piston rod is reflected by the distance change measured by the distance sensor during the operation of the electric cylinder.

[0035] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0036] By setting up an adjustment mechanism, a fixing mechanism, a first connecting mechanism, and a second connecting mechanism, the shock absorber cylinder is fixed using the fixing mechanism, and the top of the shock absorber piston rod is fixed using the second connecting mechanism, so that the bottom end of the shock absorber piston rod is installed inside the shock absorber cylinder. Driven by the adjustment mechanism, the shock absorber cylinder and the shock absorber piston rod can simulate the relative movement between the shock absorber piston rod and the shock absorber cylinder when the vehicle encounters bumps or impacts. In addition, a vibration mechanism is set outside the adjustment mechanism to synchronously drive the adjustment mechanism up and down, so that the vibration mechanism can better simulate the vibration generated when the vehicle encounters bumps or impacts. The two work together to effectively simulate and test the stability performance of the shock absorber piston rod. Attached Figure Description

[0037] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0038] In the attached diagram:

[0039] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0040] Figure 2 This is a schematic diagram of the main structure of the present invention;

[0041] Figure 3 This is a schematic diagram of the installation structure of the vibration mechanism of the present invention on the machine base;

[0042] Figure 4 This is a schematic diagram of the force-applying component of the present invention;

[0043] Figure 5 yes Figure 4 A longitudinal sectional view;

[0044] Figure 6 This is a schematic diagram of the adjustment mechanism of the present invention;

[0045] Figure 7 This is a schematic diagram of the fixing mechanism of the present invention;

[0046] Figure 8 This is a schematic diagram of the structure of the first connecting mechanism and the second connecting mechanism of the present invention;

[0047] Figure 9 yes Figure 8 A longitudinal sectional view.

[0048] In the diagram: 1. Base; 11. Control panel; 2. Vibration mechanism; 21. Lifting seat; 22. Mounting seat; 221. Vertical seat; 23. Elastic component one; 24. Side seat; 25. Shaft seat; 251. Rotating shaft; 252. Synchronous pulley; 26. Force application component; 261. Fixed cylinder one; 262. Piston shaft one; 263. Connecting seat; 264. Connecting part one; 265. Cam one; 266. Connecting rod; 3. Adjustment mechanism; 31. Vertical plate; 311. Cam two; 312. Limit seat; 32. Linkage handle; 33. Rotating handle; 34. Connecting part two; 341. Connecting block; 35. Output shaft one; 36. Output shaft two; 4. Fixed mechanism; 41. Fixed frame; 411. Guide block; 412. Protrusion; 413. Limiting block; 414. Fastener one; 42. Connecting plate one; 421. Push block; 43. L-shaped plate; 431. Guide shaft; 44. Tension spring; 5. Connecting mechanism one; 51. Connecting plate two; 511. Measuring box; 512. Protrusion; 52. Adjusting box; 521. Adjusting block; 53. Gear; 54. Rotating component; 6. Connecting mechanism two; 61. Connecting box; 62. Bushing; 63. Connecting component three; 631. Universal joint; 632. Piston shaft two; 64. Synchronizing arm; 65. Elastic component two; 651. Fixed cylinder two; 652. Piston shaft three. Detailed Implementation

[0049] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0050] like Figure 1-2As shown, the present invention provides a technical solution: a testing system for the stability performance of shock absorber piston rods in new energy vehicles, including a base 1, a vibration mechanism 2, an adjustment mechanism 3, a fixing mechanism 4, a first connecting mechanism 5, and a second connecting mechanism 6. An operating platform 11 with a PLC controller is fixedly installed on the base 1 near its edge. A circular cavity is also formed on the base 1. The vibration mechanism 2 is installed above the circular cavity on the base 1. The adjustment mechanism 3 is fixed between the side walls of the vibration mechanism 2. The vibration of the vibration mechanism 2 is used to control the amplitude adjustment of the adjustment mechanism 3. The fixing mechanism 4 is connected to one of the output ends of the adjustment mechanism 3. 4 is used for fixing and clamping the shock absorber cylinder. On the other output end of the adjustment mechanism 3, there are two cooperating connecting mechanisms: 5 and 6. The bottom of the connecting mechanism 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. The relative motion state between the shock absorber cylinder and the shock absorber piston rod caused by the up-and-down movement of the wheel when the vehicle encounters bumps or impacts (i.e., when passing through potholes, speed bumps, or severely bumpy roads). At the same time, by cooperating with the vibration mechanism 2, the vibration environment when the shock absorber piston rod and the shock absorber cylinder generate relative motion can be better simulated.

[0051] like Figure 1-5 As shown, the vibration mechanism 2 includes a lifting seat 21, a mounting seat 22, an elastic component 23, a side seat 24, a shaft seat 25, and a force application component 26;

[0052] The lifting seat 21 has a ring-shaped structure. A U-shaped mounting seat 22 is fixed to the inner surface of the lifting seat 21 by bolts. A vertically arranged vertical seat 221 is fixedly installed on the top surface of the mounting seat 22. A vertical groove is opened on the vertical seat 221, and a vertically arranged vertical shaft is fixed in the vertical groove. A through hole is also opened on the lifting seat 21.

[0053] The elastic component 23 is provided in four sets. Each set of elastic component 23 includes a vertical cylinder, a movable shaft and a spring. The vertical cylinder is fixed on the machine base 1 in the vertical direction. The top of the movable shaft is connected and fixed 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 spring is installed on the outside of the movable shaft and is located between the top surface of the vertical cylinder and the bottom wall of the lifting seat 21.

[0054] It should be further explained that as the lifting seat 21 moves back and forth in the vertical direction, when it moves downward, it will exert a force on the 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. Conversely, when it moves upward, the spring applies a reverse force to the lifting seat 21, and the movable shaft moves upward synchronously with the upward lifting seat 21.

[0055] Two side seats 24 are symmetrically arranged and fixedly installed on the outer surface of the lifting seat 21. Two opposing bearing seats 25 are fixedly installed on the top surface of the base 1 below the side seats 24. A force-applying component 26 is also provided between the side seats 24 and the bearing seats 25 on the same side.

[0056] The force application component 26 includes a fixed cylinder 261, a piston shaft 262, a connecting seat 263, a connecting piece 264, a cam 265, and a connecting rod 266.

[0057] The top end of the fixed cylinder 261 is fixed to the middle of the bottom wall of the side seat 24, and the top end of the connecting rod 266 is also fixed to the bottom wall of the side seat 24. The connecting rod 266 is located in the middle position inside the fixed cylinder 261. Two guide grooves are provided on the inner wall of the fixed cylinder 261. The top end of the piston shaft 262 always slides between the inner walls of the fixed cylinder 261. Two guide blocks are also fixedly installed on the circumferential surface of the piston shaft 262. The piston shaft 262 is located between the inner walls of the guide groove 1 on the same side as the piston shaft 262. The piston shaft 262 has a hollow inner cavity. The bottom end of the connecting rod 266 passes through and extends into the inner cavity. 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. The limiting part can slide in contact with the inner wall of the inner cavity. A spring 2 is also sleeved on the outside of the connecting rod 266. The top end of the spring 2 is fixed on the top wall of the inner cavity, and its bottom end abuts against the upper surface of the limiting part.

[0058] Two adjacent bearing seats 25 each have a cam 265 rotatably mounted on their opposite side walls via a rotating shaft 251. A connecting shaft 2 is fixedly installed between the two cams 265. The connecting seat 263 has a "U" shaped structure and its top wall is fixedly connected to the bottom end of the piston shaft 262. A connecting shaft 1 is fixedly installed between the opposite side walls of the connecting seat 263. The connecting part 264 includes two connecting ends 1 and a connecting screw 1. The two connecting ends 1 are rotatably mounted at the middle position of the connecting shaft 1 and the connecting shaft 2, respectively. The connecting screw 1 is installed between the two connecting ends 1 by a threaded connection and the exposed length of the connecting screw 1 is adjustable.

[0059] A rotary motor is provided outside one of the bearing seats 25. The rotary motor is connected to and driven by a cam 265 opposite to it via a shaft (i.e., the output shaft of the rotary motor is connected to the rotating shaft 251 connected to the cam 265). A motor base 1 is installed at the bottom of the rotary motor and is fixed on the base 1. Synchronous pulleys 252 are installed on the side walls of the two opposite bearing seats 25 on both sides of the circular cavity. A synchronous belt connects the two synchronous pulleys 252, and the synchronous pulleys 252 on the same side are coaxially connected to the cam (i.e., the two are installed on the same rotating shaft 251).

[0060] It should be further explained that by starting the rotary motor, the connected cam 265 is controlled to rotate, thereby causing the two opposing cams 265 to rotate synchronously. Under the action of the connecting piece 264, the connecting seat 263 moves up and down continuously. The connecting seat 263 synchronously drives the piston shaft 262 to move up and down. As the piston shaft 262 moves vertically within the fixed cylinder 261, it continuously applies a force to the spring 2 on the connecting rod 266. When the guide block 1 slides to the bottom of the guide groove 1, it can carry... The moving fixed cylinder 261 moves downward, thereby synchronously driving the lifting seat 21 downward through the side seat 24. When the lifting seat 21 moves to the lowest position, it begins to move upward. At this time, spring 1 applies an upward thrust to the lifting seat 21, and spring 2 also applies an upward thrust to the piston shaft 262. Combined with the upward driving force of the connecting part 264, the connecting seat 263 and piston shaft 2632 move upward. The cooperation of spring 1 and spring 2 controls the vibration simulation effect of the lifting seat 21 in the vertical direction.

[0061] Furthermore, since the connecting screw is threaded between the two connecting ends, the initial height of the connecting seat 263 can be adjusted by manually adjusting the connection length between the connecting screw and the upper connecting end (the connection length between the connecting screw and the lower connecting end can be adjusted as needed, but is generally not adjusted). This allows for adjustment of the range of motion during the vibration simulation process.

[0062] like Figure 1-2 as well as Figure 6 As shown, the adjustment mechanism 3 includes a vertical plate 31, a linkage handle 32, a rotating handle 33, a connecting piece 34, an output shaft 35, and an output shaft 36.

[0063] The vertical plate 31 is fixedly installed between the side walls of the mounting base 22 by bolts, and the vertical plate 31 is always located in the vertical area of ​​the circular cavity. A circular groove is provided near the bottom of the vertical plate 31, and a cam 311 is rotatably installed in the circular groove via a shaft connection. A rotary motor (not shown in the figure) that drives the cam 311 is installed on the other side wall of the vertical plate 31. Two limit seats 312 are fixedly installed on one side vertical side wall of the vertical plate 31. Output shaft 35 and output shaft 36 pass through and slide between the inner walls of the two limit seats 312 respectively, and a connecting block 341 is fixedly connected to the bottom end of both output shaft 35 and output shaft 36. The connecting block 341 moves linearly in the vertical direction.

[0064] The rotating handle 33 is rotatably mounted on the side wall of the vertical plate 31 via a shaft connection. One end of the linkage handle 32 is rotatably mounted to one end of the rotating handle 33 via a shaft connection. The other end of the linkage handle 32 is also rotatably mounted to the end of the second cam 311 via a shaft connection. Furthermore, the circular motion of the second cam 311 can realize the reciprocating swing of the rotating handle 33 by driving the linkage handle 32.

[0065] The second connector 34 includes two connecting ends and a connecting screw. One of the connecting ends 34 is rotatably connected to the connecting block 341 in contact with it via a shaft connection. The other connecting end 34 is rotatably connected to the rotating handle 33 via a shaft connection. The connecting screw is installed between the two connecting ends 34 via a threaded connection (in this embodiment, the length of the second connector 34 needs to be adjusted appropriately according to the test conditions). Furthermore, the linkage handle 32 and the connecting end 2, which is installed together on the end of the rotating handle 33, are coaxially connected (the two are located on opposite sides of the end of the rotating handle 33).

[0066] Among them, when Figure 6 During the process of the right end of the rotating handle 33 moving from the lowest position to the highest position, the motion trajectory of the end of the linkage handle 32 away from the rotating handle 33 (i.e. the end connected to the second cam 311) exactly matches the circumferential trajectory of the second cam 311. The motion states of the rotating handle 33 and the second cam 311 will not be disturbed by the motion of the linkage handle 32.

[0067] It should be further explained that by starting the second rotary motor, it drives the second cam 311 to perform circular motion in the circular groove (in this embodiment, according to...). Figure 6 As shown (rotating counterclockwise), the rotation of cam 311 controls the back-and-forth oscillating motion of rotating handle 33 through the engagement of linkage handle 32. Through the engagement of connecting parts 34 on both sides, the movement of output shaft 35 and output shaft 36 is controlled during the back-and-forth oscillation of rotating handle 33. Figure 6When the left end of the rotating handle 33 is higher than the right end, the connecting plate 42 and the connecting plate 51 are far apart. Figure 6 When the left end of the rotating handle 33 is lower than the right end, the connecting plate 42 and the connecting plate 51 move closer to each other to control the relative motion of the simulated shock absorber cylinder and the shock absorber piston rod when encountering bumps or impacts.

[0068] like Figure 1-2 as well as Figure 7 As shown, the fixing mechanism 4 includes a fixing frame 41, a connecting plate 42, an L-shaped plate 43, and a tension spring 44;

[0069] The fixing frame 41 has a U-shaped structure and a vertically penetrating positioning hole. Multiple protrusions 412, integrally connected to the fixing frame 41, are also provided in the upper positioning hole. Two opposing limiting blocks 413 (arc-shaped mechanisms) and two fasteners 414 (fastening screws in this embodiment) are elastically disposed in the positioning hole. A horizontally arranged guide block 411 (with a convex structure) is fixedly installed on one side of the vertical sidewall of the fixing frame 41. One end of 411 slides between the inner walls of the vertical groove. The vertical shaft passes through the guide block 411 and slides in contact with it. Above the guide block 411, a horizontally arranged connecting plate 42 is fixedly installed on the side wall of the fixed frame 41. The other end of the connecting plate 42 is fixed on the top of the output shaft 36. An electric cylinder is fixedly installed on the connecting plate 42 along its length. A push block 421 is connected to the movable end of the electric cylinder. The side wall of the push block 421 facing the piston rod of the shock absorber is set with an arc surface.

[0070] An L-shaped plate 43 is provided at the bottom of the fixed frame 41. One end of the L-shaped plate 43 is always slidably adjusted along the inner wall of the fixed frame 41. Connecting bolt 1 and connecting bolt 2 are respectively installed on the side wall of the fixed frame 41 and the L-shaped plate 43. Tension spring 44 is installed between connecting bolt 1 and connecting bolt 2, and tension spring 44 is always 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 passes 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.

[0071] It should be further explained that when fixing the shock absorber cylinder, its bottom end is passed through the positioning hole under the fixing frame 41 and pressed down against the L-shaped plate 43 to keep it vertical so that the shock absorber cylinder is completely located between the two positioning holes of the fixing frame 41. Then, continue to adjust until the top of the shock absorber cylinder contacts the protrusion 412. At this time, the limiting block 413 in the positioning hole is tightly attached to the outer surface of the shock absorber cylinder under the elastic action. Then, tighten the fastener 414 to the surface of the shock absorber cylinder to fix the shock absorber cylinder on the fixing frame 41, while the shock absorber piston rod is installed in the shock absorber cylinder in its normal working state.

[0072] Since the output shaft 2 36 is connected to the fixed mechanism 4, when the output shaft 2 36 moves up and down, the fixed mechanism 4 will also drive the shock absorber cylinder to move up and down together.

[0073] like Figure 1-2 as well as Figure 8-9 As shown, the connecting mechanism 5 includes a connecting plate 51, an adjusting box 52, a gear 53, and a rotating component 54;

[0074] One end of the connecting plate 2 51 is fixed to the top of the output shaft 1 35, and a support frame is also fixedly installed on the output shaft 1 35. The top of the support frame is fixed to the bottom wall of the connecting plate 2 51. A through hole 2 is opened on the connecting plate 2 51 along its length direction. A measuring box 511 is fixedly installed on the top surface of the connecting plate 2 51. A control power supply is installed on one side of the measuring box 511, and a distance sensor is installed on one side wall surface of the measuring box 511. The distance sensor is arranged 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.

[0075] The other end of the connecting plate 51 is U-shaped, and arc-shaped protrusions 512 are fixed on the opposite side walls of the end. A rotating component 54 is rotatably arranged between the side walls of the U-shaped end of the connecting plate 51. The rotating component 54 is an arc-shaped strip structure. A gear 53 is rotatably arranged on the top surface of the connecting plate 51 by means of shaft connection. Several tooth grooves are opened on the outer surface of the rotating component 54 facing the gear 53. The gear 53 meshes with the tooth grooves for transmission. Arc-shaped grooves matching the protrusions 512 are opened on the top and bottom surfaces of the rotating component 54.

[0076] The adjustment box 52 slides through the connecting plate 51 and moves along the length of the connecting plate 51. A groove is provided on the adjustment box 52 along its length. A transverse shaft is fixed in the groove. An adjustment block 521 is slidably arranged between the inner walls of the groove. The transverse shaft passes through the adjustment block 521 and slides in contact with it.

[0077] It should be further explained that when the rotating part 54 rotates under the action of the connecting mechanism 6, under the limiting action of the protrusion 512 and the arc groove, the rotating part 54 will drive the gear 53 meshing with it to rotate. At the same time, under the action of the connecting mechanism 6, the top synchronous arm 64 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 connecting plate 51, the synchronous arm 64 will drive the adjusting box 52 to move and adjust along the length direction of the 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 box 52 to move and adjust along the length direction of the connecting plate 51 while driving the adjusting block 521 to move along the length direction of the adjusting box 52.

[0078] The second connecting mechanism 6 includes a connecting box 61, a bushing 62, a connecting piece 63, a synchronizing arm 64, and an elastic component 65;

[0079] A spherical cavity is provided in the middle of the bottom of the connecting box 61, and a connecting groove is provided in the middle of the bottom of the bushing 62. A rubber strip is adhered to the inner wall of the connecting groove. The top 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. In addition, multiple fasteners (fastening screws in this embodiment) for fixing the top of the shock absorber piston rod are installed on the bushing 62 by means of threaded connection. A "T"-shaped connecting bolt is fixedly installed on the top surface of the connecting box 61. One end of the synchronizing arm 64 is fixed on the connecting bolt, and the other end is movably connected to the top surface of the adjusting block 521 through a shaft connection.

[0080] The connecting component 63 includes a universal joint 631 and a 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 piston shaft 632 is connected and fixed to the top surface of the bushing 62. Two guide blocks are also fixedly installed on the outer circumference of the top end of the piston shaft 632. A guide groove 2 is provided inside the universal joint 631 along its length direction. The guide blocks 2 slide between the inner walls of the guide groove 2.

[0081] The second elastic component 65 is disposed between the side walls of the connecting box 61 and 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 connecting box 61, and a guide groove 3 is provided between its inner walls along the length direction of the second fixed cylinder 651. One end of the third piston shaft 652, which has a "T" shape, is fixed to 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 guide blocks 3 are also fixedly installed on the outer surface of the third piston shaft 652 located inside the second fixed cylinder 651. The guide blocks 3 slide between the inner walls of the guide groove 3. A third spring 3 is also sleeved on the outside of the third piston shaft 652. One end of the third spring 3 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.

[0082] It should be further explained that before the test, by placing the top of the shock absorber piston rod in the connecting groove of the bushing 62, the roughness of the rubber strip surface is used to increase the connection stability. At the same time, the tightening effect of the fastener 2 is used to make the bushing 62 and the shock absorber piston rod connected and fixed. Since the end of the connector 3 63 connected to the connector box 61 is a spherical structure, the connector box 61 can undergo displacement movement in its plane even if the shock absorber piston rod becomes loose and shifts (the displacement movement of the connector box 61 is due to the positional relationship of the rotating part 54 and the limiting effect of the elastic component 2 65).

[0083] When the connecting box 61 moves along the length of the connecting plate 51, the fixed cylinder 651 and the piston shaft 652 will move towards or away from each other, causing the spring to deform. When the connecting box 61 moves in other directions, such as perpendicular to the length of the connecting plate 51, the connecting box 61 will cause the elastic component 65 to move elastically and the rotating component 54 to rotate at an angle during the displacement, so as to match its displacement in the plane.

[0084] In addition, after the cyclic test, the coaxiality between the shock absorber piston rod and the shock absorber cylinder needs to be checked. During the test, only the electric cylinder is activated, which drives the push block 421 to move closer to the shock absorber piston rod until it contacts the shock absorber piston rod and remains stable. Then the electric cylinder is manually stopped. At the same time, the control power is activated simultaneously when the electric cylinder is activated, so that the distance sensor enters the working mode to detect the straight 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, the distance value should remain unchanged. Conversely, when the distance value changes, it indicates that the shock absorber piston rod has become loose in the shock absorber cylinder. Therefore, after the push block 421 contacts the shock absorber piston rod, the shock absorber piston rod is subjected to a force and shifts to one side.

[0085] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection, the internal communication between two components, or the interaction between two components. Those skilled in the art can understand the meaning of the above terms in this application according to the specific circumstances.

[0086] The above provides a detailed description of the testing system and method for the stability performance of shock absorber piston rods in new energy vehicles, as provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A testing system for the stability performance of shock absorber piston rods in new energy vehicles, including: The base (1) is provided with an operating table (11) with a PLC controller, and a circular cavity is provided on the base (1); Its characteristic is that it further includes: Vibration mechanism (2), the vibration mechanism (2) is arranged vertically on the periphery of the circular cavity, and the vibration mechanism (2) provides the vibration sensation when a vehicle encounters bumps or impacts in a reciprocating linear elastic motion mode; Adjustment mechanism (3), the adjustment mechanism (3) is fixed between the side walls of the vibration mechanism (2), and the adjustment mechanism (3) moves vertically above the circular cavity. An output shaft one (35) and an output shaft two (36) with opposite directions of movement are provided on the adjustment mechanism (3). The adjustment mechanism (3) also includes a vertical plate (31), a linkage handle (32), a rotating handle (33), and a connecting piece two (34). The vertical plate (31) is fixed vertically between the side walls of the mounting base (22). A cam two (311) is rotatably installed on one side wall of the vertical plate (31), and a rotary motor two that drives the cam two (311) is installed on the other side wall of the vertical plate (31). The rotating handle (33) is rotatably mounted on one side wall of the vertical plate (31) via a shaft connection, and the linkage handle (32) is provided between one end of the rotating handle (33) and the second cam (311) via a shaft connection. Two limit seats (312) are provided on the side wall of the vertical plate (31). The first output shaft (35) and the second output shaft (36) pass through the limit seats (312) respectively and move and adjust in the vertical direction. A connecting block (341) is provided on the bottom end of the first output shaft (35) and the second output shaft (36). Two connecting parts (34) are provided and are respectively located between the connecting block (341) on the same side and the end of the rotating handle (33). The length of the connecting parts (34) can be adjusted, and the movement of the second cam (311) and the rotating handle (33) does not interfere with each other. The fixing mechanism (4) is connected to the top end of the output shaft (36) and moves synchronously therewith. The fixing mechanism (4) holds the shock absorber cylinder. Connection mechanism 1 (5) is connected to the top end of output shaft 1 (35) and moves synchronously therewith; The second connecting mechanism (6) is elastically connected to the first connecting mechanism (5), and a shock absorber piston rod is provided at the bottom of the second connecting mechanism (6), with the bottom end of the shock absorber piston rod installed in the shock absorber cylinder.

2. The testing 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), an elastic component (23), a side seat (24), and a shaft seat (25). The lifting seat (21) is arranged in a circular structure. A "U"-shaped mounting seat (22) is fixed on the inner surface of the lifting seat (21). Two side seats (24) are provided and symmetrically installed on the outer surface of the lifting seat (21). Four sets of elastic components (23) are provided and are all installed between the bottom wall of the lifting seat (21) and the top surface of the base (1). Below the side seat (24), two oppositely distributed bearing seats (25) are provided on the base (1). A rotary motor is also installed on the outer side of one of the bearing seats (25) on the base (1). Synchronous pulleys (252) are rotatably provided on the same side wall of the two opposite bearing seats (25) located on both sides of the circular cavity. The two synchronous pulleys (252) are connected by a synchronous belt, and one of the synchronous pulleys (252) rotates with the drive of the rotary motor.

3. The testing 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 includes a force application component (26), which includes a fixed cylinder (261), a piston shaft (262), a connecting seat (263), a connecting piece (264), a cam (265), and a connecting rod (266). The top ends of the fixed cylinder (261) and the connecting rod (266) are fixed on the bottom wall of the side seat (24). The connecting rod (266) is located in the middle of the fixed cylinder (261), and a limiting part is provided at the bottom end of the connecting rod (266). The longitudinal section of the limiting part is an isosceles trapezoid. The top end of piston shaft 1 (262) always slides between the inner walls of fixed cylinder 1 (261), and an inner cavity is provided inside piston shaft 1 (262). Connecting rod (266) passes through and extends into the inner cavity, and limiting part always slides between the inner walls of the inner cavity. A second spring is provided outside the connecting rod (266) located in the inner cavity. 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 on the bottom end of the piston shaft (262). One end of the connecting piece (264) is connected to the connecting seat (263) by a shaft, and the other end of the connecting piece (264) is connected to the cam (265) by a shaft on both sides. The length of the connecting piece (264) can be manually adjusted by a threaded connection. The other end of the 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). The output shaft of the rotary motor is connected to and drives one of the rotating shafts (251), and two synchronous pulleys (252) are respectively set on one of the rotating shafts (251) that are close to it.

4. The testing system for the stability performance of the shock absorber piston rod of a new energy vehicle according to claim 3, characterized in that, The fixing mechanism (4) includes a fixing frame (41), a 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 and bottom. Two elastically adjustable arc-shaped limiting blocks (413) and two fasteners (414) connected by threads are provided in the positioning holes. The fasteners (414) are set screws, and multiple protrusions (412) are also provided in the positioning holes at the top 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 L-shaped plate (43) and the side wall of the fixed frame (41) on the same side. A guide block (411) with a "convex" structure is installed on one side of the vertical side wall of the fixed frame (41). A vertical seat (221) is provided on the mounting base (22) in the vertical direction. 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 slides in contact with it. A guide shaft (431) is also provided at the bottom end of the L-shaped plate (43). The guide shaft (431) passes through the lifting seat (21) and slides with it. A limiting boss that is always located below the lifting seat (21) is also provided at the bottom end of the guide shaft (431). One end of the connecting plate (42) is fixed to the top of the output shaft (36) and is perpendicular to it. The other end of the connecting plate (42) is fixed to the side wall of the fixing frame (41). An electric cylinder is installed on the connecting plate (42). A push block (421) is provided on the movable end of the electric cylinder. The push block (421) is arranged in an arc shape facing the side wall of the shock absorber piston rod.

5. The testing system for the stability performance of the shock absorber piston rod of a new energy vehicle according to claim 4, characterized in that, The first connecting mechanism (5) includes a second connecting plate (51), an adjusting box (52), a gear (53), and a rotating component (54). One end of the second connecting plate (51) is fixed to the top of the first output shaft (35) and they are arranged vertically. A support frame is also provided between the bottom end of the second connecting plate (51) and the first output shaft (35). The adjusting box (52) passes through and slides between the inner wall and the top wall of the second connecting plate (51). A groove is provided along the length of the adjusting box (52). An adjusting block (521) is slidably arranged between the inner walls of the groove. A transverse shaft is passed through the middle of the adjusting block (521) and slides in contact with it. 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 provided in the measuring box (511). The distance sensor is arranged opposite to the adjusting box (52). The end of the connecting plate 2 (51) away from the output shaft 1 (35) is set in a "U" shape and a protrusion (512) is installed on the opposite side wall of the end. The gear (53) is rotatably set on the connecting plate 2 (51) through a shaft connection. The rotating part (54) is set in an arc-shaped strip structure. Arc grooves are opened on the top and bottom walls of the rotating part (54). The protrusion (512) matches the arc groove and can rotate in contact with it. 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.

6. The testing system for the stability performance of the shock absorber piston rod of a new energy vehicle according to claim 5, characterized in that, The second connecting mechanism (6) includes a connecting box (61), a bushing (62), a third connecting piece (63), a synchronizing arm (64), and a second elastic component (65). The top of the connecting box (61) is provided with a "T"-shaped connecting bolt three. One end of the synchronizing arm (64) is fixed on the connecting bolt three, and the other end of the synchronizing arm (64) is movably connected to the adjusting block (521) via a shaft. A spherical cavity is opened in the middle of the bottom wall of the connecting box (61). The connecting part three (63) includes a universal joint (631) and a piston shaft two (632). The top of the universal joint (631) is spherical and is rotatably disposed between the inner walls of the spherical cavity. One end of the piston shaft two (632) always slides between the inner walls of the universal joint (631). The bottom end of the piston shaft two (632) is connected and fixed to the top end of the bushing (62). A connecting groove is provided 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 by fastener two. A rubber strip is adhered to the inner wall of the connecting groove. Fastener two is a set screw. The elastic component three includes a fixed cylinder two (651) and a piston shaft three (652). One end of the fixed cylinder two (651) is fixed to the side wall of the connecting box (61). One end of the piston shaft three (652) has a "T" shape and is fixed to the side wall of the rotating part (54) facing the connecting box (61). The other end of the piston shaft three (652) always slides between the inner walls of the fixed cylinder two (651). A spring three is provided on the outside of the piston shaft three (652). The spring three is located between the end face of the fixed cylinder two (651) and the "T"-shaped end of the piston shaft three (652).

7. The testing system for the stability performance of the shock absorber piston rod of a new energy vehicle according to claim 6, characterized in that, When the piston rod of the shock absorber drives the connecting box (61) to move in the plane where the connecting box (61) is located, the piston shaft three (652) and the fixed cylinder two (651) will move closer or further away from each other as the position of the connecting box (61) changes, so that the adjusting box (52) moves in a straight line along the length direction of the connecting plate one (42). In addition, during the test, the connecting box (61) will also drive the rotating part (54) to rotate and adjust between the two protrusions (512) through the elastic component two (65), so that the gear (53) will rotate and adjust synchronously with the rotation of the rotating part (54). When the push block (421) contacts the piston rod of the shock absorber, since the push block (421) does not stop moving immediately, if the piston rod of the shock absorber becomes loose in the shock absorber cylinder under the action of the electric cylinder, the connecting box (61) will move away from the rotating part (54), thereby causing the adjusting box (52) to move 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.

8. The test method for the test system of the shock absorber piston rod stability performance test system for new energy vehicles according to claim 7, characterized in that, Includes the following steps: S1. First, adjust the length of connector one (264) and connector two (34) manually according to the test requirements. Fix the shock absorber cylinder vertically between the L-shaped plate (43) and the convex piece (412) of the upper positioning hole. Use fastener one (414) 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 of the shock absorber piston rod to the bushing (62). Use fastener two to assist in positioning the tightness between the shock absorber piston rod and the bushing (62). S2. Next, the rotary motor one and rotary motor two are started simultaneously through the control panel (11), so that the force application component (26) and cam two (311) start outputting work at the same time. The force application component (26) controls the elastic vertical process of the lifting seat (21) with the reciprocating motion of the circle. The cam two (311) controls the vertical movement of the output shaft one (35) and the output shaft two (36) through the linkage handle (32) and the rotating handle (33) with the circular motion, thereby simulating the relative movement 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 operating panel (11) to make the distance sensor enter the working mode, and start the electric cylinder at the same time. The electric cylinder drives the push block (421) to move towards the side where the shock absorber piston rod is located until the push block (421) contacts the shock absorber piston rod and remains stable. Then, stop the electric cylinder through the operating panel (11). After that, the working stability of the shock absorber piston rod is reflected by the distance change measured by the distance sensor during the operation of the electric cylinder.

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