A linear actuator test bench

Abstract

This application discloses a linear actuator test bench, relating to the field of linear actuator testing technology. It includes a test bench body, a loading device fixed to its upper end, a test rod mounted on one side of the loading device, a weight rack fixed to the side of the loading device away from the test rod, an indicating device fixed to the upper end of the test bench body, an actuator body mounted on the upper end of the test bench body, a power supply chassis mounted on the side of the test bench body, a control platform fixed to the upper end of the power supply chassis, and an installation structure for quick assembly and disassembly of the actuator body on the upper end of the test bench. This installation structure enables rapid assembly and disassembly of the actuator body, greatly shortening clamping time, and significantly improving overall testing efficiency, especially in batch testing scenarios. Simultaneously, the automatic centering calibration function ensures that the actuator is in the optimal testing position during each test, effectively improving the accuracy and repeatability of the test results.

Description

Technical Field

[0001] This application relates to the field of linear actuator testing technology, and in particular to a linear actuator test bench. Background Technology

[0002] The linear actuator test bench consists of two parts: an electrical control box and a loading test bench. It is the core equipment for testing the performance of linear actuators. The electrical control box, as the system's control and data acquisition unit, primarily provides a stable power supply to the actuator under test, supporting inching or continuous extension and retraction movements, and displaying various feedback signals such as position and current in real time. It also has reserved measurement points for indirectly detecting the voltage parameters of the tested component, comprehensively monitoring its electrical status. The loading test bench is responsible for mechanical loading and force value acquisition: after the actuator under test is installed and fixed, simulated loads can be applied in its extension and retraction directions. The actual loading torque value is transmitted to the electrical control box via built-in sensors and displayed visually, fully meeting the load-bearing performance testing requirements of linear actuators.

[0003] This test bench features an integrated design, combining multiple power supply types and multi-parameter data display functions. Its intuitive and simple user interface significantly lowers the barriers to debugging and use. Equipped with high-precision force / torque sensors and a stable loading mechanism, it can accurately collect loading data, meeting the stringent requirements of high-precision testing. Furthermore, it boasts strong versatility; through its adjustable mounting and loading structure, it can be adapted to test different models and specifications of linear actuators, eliminating the need for frequent tooling changes and effectively improving the equipment's reusability and testing coverage.

[0004] Existing linear actuator test benches typically use bolts to secure the linear actuators when clamping the test piece. This process is cumbersome, requiring the use of wrenches and other tools to tighten or loosen the bolts one by one. Furthermore, when clamping different types of actuators, the bolt positions and tightening forces need to be readjusted. The process is complex and time-consuming, directly impacting testing efficiency. In particular, in batch testing scenarios, frequent clamping operations further slow down the overall testing process. Summary of the Invention

[0005] The purpose of this application is to solve the problem that the existing test benches mentioned in the background art are cumbersome to disassemble and assemble linear actuators, and affect the testing efficiency during batch testing. This application provides a linear actuator test bench.

[0006] To achieve the above objectives, this application specifically adopts the following technical solution: A linear actuator test bench includes a test bench body, a loading device fixed to the upper end of the test bench, a test rod installed on one side of the loading device, a weight rack fixed to the side of the loading device away from the test rod, an indicating device fixed to the upper end of the test bench body, an actuator body disposed on the upper end of the test bench body, a power supply chassis disposed on the side of the test bench body, a control platform fixed to the upper end of the power supply chassis, and the control platform being electrically connected to the loading device, the indicating device, and the actuator body. The upper end of the test bench is provided with an installation structure for quick assembly and disassembly of the actuator body.

[0007] By adopting the above technical solution, during testing, the actuator is first installed on the test bench and fixed by the mounting structure. The electronic control platform outputs commands to drive the actuator to move, extending to push the test rod for loading and retracting to pull the test rod for reverse loading; high-precision sensors collect force and torque data in real time, and the indicator device dynamically displays load changes. The mounting structure enables quick assembly and disassembly, shortens clamping time, and improves batch testing efficiency.

[0008] Furthermore, the mounting structure includes a mounting base fixed to the upper end of the test bench body. Two symmetrically arranged fixing plates are mounted on the upper end of the mounting base. An arc-shaped fixing groove is opened on the opposite side of each of the two fixing plates. Two symmetrically arranged support plates are fixed to the upper end of the mounting base. Multiple telescopic sleeves are fixed to the sides of the support plates. The side of the telescopic sleeve away from the support plate is fixedly connected to the fixing plate. A support spring is slidably sleeved on the telescopic sleeve. The two ends of the support spring are fixedly connected to the fixing plate and the support plate, respectively. A limit component is provided between the mounting base and the fixing plate. An alignment component is provided between the fixing plate and the support plate.

[0009] By adopting the above technical solution, the mounting structure is used to fix the actuator body. The fixing and disassembly process is relatively convenient. In the process of mass actuator testing, compared with the traditional bolt fixing method, the disassembly and installation efficiency is higher, thereby improving the testing efficiency.

[0010] Furthermore, the limiting component includes two push plates mounted on the upper end of the mounting base, which are symmetrically arranged. A push rod is fixed to the side of each push plate. Two symmetrically arranged movable slots are opened at the upper end of the mounting base. A bidirectional ball screw is rotatably connected inside the mounting base. A nut seat adapted to the bidirectional ball screw is fixed at the lower end of each push plate. The nut seat is sleeved on the bidirectional ball screw. A servo motor is fixed to the side of the mounting base. The output end of the servo motor extends into the movable slot and is fixedly connected to the bidirectional ball screw. The servo motor is electrically connected to the control platform. A guide component is provided inside the mounting base.

[0011] By adopting the above technical solution, the limiting component is used to limit the fixed plate, thereby improving the fixing effect of the fixed plate on the actuator body. The limiting and releasing process is relatively convenient and does not require the use of other tools, which facilitates the disassembly and assembly of the actuator body.

[0012] Furthermore, the guide component includes a guide roller rotatably connected to the lower end of the nut seat, a guide groove is provided at the bottom of the movable groove, the guide roller extends into the guide groove, and the surface of the guide roller is in contact with the inner wall of the guide groove.

[0013] By adopting the above technical solution, the guide roller and the guide groove play a guiding role, and the guide roller can reduce the friction of the nut seat, making its movement smoother.

[0014] Furthermore, a pressure sensor is embedded and fixed at the end of the push rod away from the push plate, and the pressure sensor is electrically connected to the control platform.

[0015] By adopting the above technical solution, the pressure sensor is used to monitor the pressure of the push rod on the fixed plate in real time. When the pressure reaches the preset value, it sends a signal to the control platform to shut down the servo motor in time.

[0016] Furthermore, a guide plate is fixed to the side of the fixing plate, and the guide plate is arc-shaped and inclined.

[0017] By adopting the above technical solution, the guide plate plays a guiding role when installing the actuator body, making it easier to install the actuator body between the two fixed plates.

[0018] Furthermore, the centering component includes a mounting groove inside the fixed plate, with two mounting grooves inside the fixed plate. A centering airbag strip is fixed inside the mounting groove. A delivery pipe is fixed inside the support plate. One end of the delivery pipe away from the support plate extends into the fixed plate and is fixed with a diverter pipe. The diverter pipe is fixedly connected to the centering airbag strip. An inflation component is provided on the side of the support plate.

[0019] By adopting the above technical solution, the centering component is used to realize the automatic centering and calibration of the actuator body, which is more conducive to improving the test accuracy.

[0020] Furthermore, the inflatable component includes a spring airbag pad fixed to the side of the support plate. The spring airbag pad is fixedly connected to the delivery pipe. The spring airbag pad and the centering airbag strip are connected through the delivery pipe and the diversion pipe. An abutment plate is fixed to the side of the spring airbag pad away from the support plate. An extrusion rod is fixed to the side of the push plate. The position of the extrusion rod corresponds to that of the abutment plate.

[0021] By adopting the above technical solution, when the push plate moves, the inflation component is used to inflate the centering airbag strip to achieve the centering function.

[0022] In summary, this application includes at least one of the following beneficial effects; 1. In this application, when installing the actuator body, the actuator body is aligned with two guide plates, and then the actuator body is pushed, causing the two guide plates to be stressed. The stress on the guide plates causes the two fixed plates to gradually separate. During this process, the support spring is compressed and the telescopic sleeve retracts until the actuator body is embedded in the arc-shaped fixing groove of the fixed plate. At this time, the two fixed plates, supported by the support spring, clamp the actuator body, achieving pre-fixation of the actuator body. This effectively reduces the shaking of the actuator body during installation. During installation, it is not necessary to manually support the actuator body continuously, reducing the installation difficulty, improving the convenience of installation, and enhancing the stability of installation.

[0023] 2. In this application, after pre-fixation, the servo motor drives the bidirectional ball screw to rotate. Then, under the action of the nut seat, guide roller, and guide groove, the push plate moves along the movable groove, and the push rod on its side moves accordingly. The end of the push rod abuts against the fixed plate, thus limiting the fixed plate and preventing it from moving towards the support plate. This, in conjunction with the fixed plate, achieves good fixation of the actuator body. When disassembly is required after testing, the servo motor is controlled to reverse its output, releasing the push rod's limitation on the fixed plate, and then the actuator body can be removed. The installation structure enables rapid assembly and disassembly of the actuator body, greatly shortening clamping time, and significantly improving overall testing efficiency, especially in batch testing scenarios.

[0024] 3. In this application, during the process of the push plate driving the push rod to limit the fixed plate, the squeezing rod on the side of the push plate gradually contacts the contact plate of the spring airbag pad, squeezing the spring airbag pad so that the gas inside it is injected into the centering airbag strip through the delivery pipe and the diversion pipe. The centering airbag strip expands and extends out from the mounting groove, contacting the actuator body. If the actuator body is not in the center position, the centering airbag strip will first contact the side of the actuator body that is offset. The reaction force generated by continuous inflation pushes the actuator body to move towards the center position until the centering airbag strip evenly wraps the surface of the actuator body, realizing automatic centering calibration, which is more conducive to improving the test accuracy.

[0025] 4. In this application, when fixing the actuator body, the central airbag strip wraps around the actuator body, which can effectively play a role in damping vibration. When the actuator body is working, it can effectively absorb the vibration energy generated by it, reduce the interference of vibration on the test results, and further improve the stability and reliability of the test data. Attached Figure Description

[0026] Figure 1 This is a disassembly diagram of the test bench and actuator in this application; Figure 2 This is a schematic diagram of the internal structure of the mounting base in this application; Figure 3 This is a schematic diagram of the installation structure in this application; Figure 4 This application Figure 2 Enlarged view of point A in the middle; Figure 5 This is a partial structural diagram of the centering component in this application.

[0027] Explanation of reference numerals in the attached figures: 1. Test bench body; 11. Loading device; 12. Test rod; 13. Weight rack; 14. Indicating device; 15. Actuator body; 16. Power supply box; 17. Control platform; 2. Mounting base; 21. Fixing plate; 22. Support plate; 23. Telescopic sleeve; 24. Support spring; 25. Push plate; 251. Push rod; 252. Movable groove; 253. Bidirectional ball screw; 254. Nut seat; 255. Servo motor; 256. Guide roller; 257. Guide groove; 26. Pressure sensor; 27. Guide plate; 28. Mounting groove; 281. Centering airbag strip; 282. Conveying pipe; 283. Diverter pipe; 284. Spring airbag pad; 285. Contact plate; 286. Extrusion rod. Detailed Implementation

[0028] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0029] This application discloses a linear actuator test bench.

[0030] Reference Figure 1 A linear actuator test bench includes a test bench body 1, a loading device 11 fixed at the upper end of the test bench, a test rod 12 installed on one side of the loading device 11, a weight rack 13 fixed on the side of the loading device 11 away from the test rod 12, an indicator device 14 fixed at the upper end of the test bench body 1, an actuator body 15 disposed at the upper end of the test bench body 1, a power supply box 16 disposed on the side of the test bench body 1, a control platform 17 fixed at the upper end of the power supply box 16, and the control platform 17 is electrically connected to the loading device 11, the indicator device 14, and the actuator body 15. The upper end of the test bench is provided with an installation structure for quick assembly and disassembly of the actuator body 15.

[0031] When testing the actuator body 15, the test bench first mounts the actuator body 15 onto the test bench body. During installation, the actuator body 15 is fixed in place by the mounting structure, and then the test begins. During the test, the electronic control platform outputs control commands to drive the actuator under test to complete the actions: when the actuator extends, it pushes the test rod 12 to transmit the loading force; when the actuator retracts, it pulls the test rod 12 to form a reverse loading. Throughout the test, high-precision sensors collect and transmit loading force and torque data in real time. The indicator device 14 of the test bench synchronously and dynamically displays various loading data, providing intuitive feedback on the load change status during the test. This mounting structure enables rapid assembly and disassembly of the actuator body 15, greatly shortening the clamping time, and significantly improving overall testing efficiency, especially in batch testing scenarios. At the same time, the automatic centering calibration function ensures that the actuator is in the optimal testing position for each test, effectively improving the accuracy and repeatability of the test results. In addition, the entire mounting structure adopts a modular design, with tight connections between components and easy maintenance, reducing maintenance costs and difficulties during later use.

[0032] Reference Figure 2 - Figure 4 The installation structure includes a mounting base 2 fixed to the upper end of the test bench body 1. Two symmetrically arranged fixing plates 21 are installed on the upper end of the mounting base 2. An arc-shaped fixing groove is opened on the opposite side of each of the two fixing plates 21. Two symmetrically arranged support plates 22 are fixed to the upper end of the mounting base 2. Multiple telescopic sleeves 23 are fixed to the side of the support plates 22. The side of the telescopic sleeves 23 away from the support plates 22 is fixedly connected to the fixing plates 21. Support springs 24 are slidably sleeved on the telescopic sleeves 23. The two ends of the support springs 24 are fixedly connected to the fixing plates 21 and the support plates 22 respectively. A limit component is provided between the mounting base 2 and the fixing plates 21. An alignment component is provided between the fixing plates 21 and the support plates 22.

[0033] The limiting component includes two push plates 25 mounted on the upper end of the mounting base 2, which are arranged symmetrically. A push rod 251 is fixed to the side of the push plate 25. Two symmetrically arranged movable slots 252 are opened at the upper end of the mounting base 2. A bidirectional ball screw 253 is rotatably connected inside the mounting base 2. A nut seat 254 adapted to the bidirectional ball screw 253 is fixed at the lower end of the push plate 25. The nut seat 254 is sleeved on the bidirectional ball screw 253. A servo motor 255 is fixed to the side of the mounting base 2. The output end of the servo motor 255 extends into the movable slot 252 and is fixedly connected to the bidirectional ball screw 253. The servo motor 255 is electrically connected to the control platform 17. A guide is provided inside the mounting base 2.

[0034] In addition, the guide includes a guide roller 256 rotatably connected to the lower end of the nut seat 254, and a guide groove 257 is provided at the bottom of the movable groove 252. The guide roller 256 extends into the guide groove 257, and the surface of the guide roller 256 is in contact with the inner wall of the guide groove 257.

[0035] Furthermore, a pressure sensor 26 is embedded and fixed at the end of the push rod 251 away from the push plate 25, and the pressure sensor 26 is electrically connected to the control platform 17.

[0036] Furthermore, a guide plate 27 is fixed to the side of the fixing plate 21. The guide plate 27 is arc-shaped and inclined.

[0037] When installing the actuator body 15, align the actuator body 15 with the two guide plates 27, and then push the actuator body 15, causing the two guide plates 27 to be stressed. The stress on the guide plates 27 causes the two fixing plates 21 to be stressed, causing the two fixing plates 21 to gradually separate. During the separation of the fixing plates 21, the support spring 24 is compressed simultaneously, and the telescopic sleeve 23 retracts until the actuator body 15 is embedded in the arc-shaped fixing groove of the fixing plate 21. At this time, the two fixing plates 21, supported by the support spring 24, clamp the actuator body 15, thereby achieving the actuation. The pre-fixation of the actuator body 15 effectively reduces the shaking of the actuator body 15 during installation. It eliminates the need for continuous manual support of the actuator body 15 during installation, reducing installation difficulty, improving ease of installation, and enhancing installation stability. After pre-fixation, the control platform 17 starts the servo motor 255, which drives the bidirectional ball screw 253 to rotate. The rotation of the bidirectional ball screw 253 causes the nut seat 254 to move along the movable groove 252. At this time, the guide roller 256 rolls within the guide groove 257 to ensure smooth movement. The push plate 25 moves with the nut seat 254, and its side push rod 251 follows, causing the end of the push rod 251 to abut against the fixed plate 21, thereby limiting the fixed plate 21 and preventing it from moving towards the support plate 22. This, in conjunction with the fixed plate 21, achieves good fixation of the actuator body 15. When the push rod 251 contacts the fixed plate 21, the pressure sensor 26 at its end can detect the thrust on the fixed plate 21 in real time. When the pressure value reaches the preset threshold, it indicates that the limit on the fixed plate 21 has been reached. At this time, the control platform 17 sends a signal to stop the servo motor 255, thereby completing the quick clamping of the actuator body 15.

[0038] Reference Figure 2 - Figure 5The centering component includes a mounting groove 28 inside the fixed plate 21. Two mounting grooves 28 are opened inside the fixed plate 21. A centering airbag strip 281 is fixed inside the mounting groove 28. A delivery pipe 282 is fixed inside the support plate 22. One end of the delivery pipe 282 away from the support plate 22 extends into the fixed plate 21 and is fixed with a diversion pipe 283. The diversion pipe 283 is fixedly connected to the centering airbag strip 281. An inflation component is provided on the side of the support plate 22.

[0039] The inflatable component includes a spring airbag pad 284 fixed to the side of the support plate 22. The spring airbag pad 284 is fixedly connected to the delivery pipe 282. The spring airbag pad 284 and the centering airbag strip 281 are connected through the delivery pipe 282 and the diversion pipe 283. An abutment plate 285 is fixed to the side of the spring airbag pad 284 away from the support plate 22. An extrusion rod 286 is fixed to the side of the push plate 25. The position of the extrusion rod 286 corresponds to that of the abutment plate 285.

[0040] During the process of the push plate 25 driving the push rod 251 to limit the fixed plate 21, the squeezing rod 286 on the side of the push plate 25 gradually abuts against the abutting plate 285 of the spring airbag pad 284, squeezing the spring airbag pad 284 so that the gas inside it is injected into the centering airbag strip 281 through the delivery pipe 282 and the diversion pipe 283. The centering airbag strip 281 expands and extends out from the mounting groove 28, abutting against the actuator body 15. If the actuator body 15 is not in the center position, the centering airbag strip 281 will first contact the actuator body 15 to the side that is offset. The reaction force generated by continuous inflation pushes the actuator body 15 to move towards the center position until the centering airbag strip 281 evenly wraps around the surface of the actuator body 15, realizing automatic centering calibration, which is more conducive to improving the test accuracy. Furthermore, by wrapping the actuator body 15 with the central airbag strip 281, it can effectively play a role in damping vibration. When the actuator body 15 is working, it can effectively absorb the vibration energy generated by it, reduce the interference of vibration on the test results, and further improve the stability and reliability of the test data.

[0041] Working principle: When testing the actuator body 15, the actuator body 15 is first installed on the test platform. During installation, the actuator body 15 is aligned with the two guide plates 27. Then, the actuator body 15 is pushed, causing the two guide plates 27 to bear force. The force on the guide plates 27 causes the two fixing plates 21 to bear force, causing the two fixing plates 21 to gradually separate. During the separation of the fixing plates 21, the support spring 24 is compressed and the telescopic sleeve 23 retracts until the actuator body 15 is embedded in the arc-shaped fixing groove of the fixing plate 21. At this time, the two fixing plates 21, supported by the support spring 24, clamp the actuator body 15, realizing the pre-fixation of the actuator body 15. This effectively reduces the shaking of the actuator body 15 during installation. During the installation process, it is not necessary to manually support the actuator body 15 continuously, which reduces the installation difficulty, improves the convenience of installation, and enhances the stability of installation.

[0042] After pre-fixing is completed, the control platform 17 starts the servo motor 255, which drives the bidirectional ball screw 253 to rotate. The rotation of the bidirectional ball screw 253 drives the nut seat 254 to move along the movable groove 252. At this time, the guide roller 256 rolls in the guide groove 257 to ensure smooth movement. The push plate 25 moves with the nut seat 254, and the push rod 251 on its side moves accordingly, so that the end of the push rod 251 abuts against the fixed plate 21, thereby limiting the fixed plate 21 and preventing it from moving towards the support plate 22. This, in turn, helps to fix the actuator body 15 with the fixed plate 21, and the fixing effect is good. When the push rod 251 contacts the fixed plate 21, the pressure sensor 26 at its end can detect the thrust on the fixed plate 21 in real time. When the pressure value reaches the preset threshold, it indicates that the limiting of the fixed plate 21 has been completed. At this time, the control platform 17 sends a signal to stop the servo motor 255, thereby completing the quick clamping of the actuator body 15. During the process of the push plate 25 driving the push rod 251 to limit the fixed plate 21, the squeezing rod 286 on the side of the push plate 25 gradually contacts the contact plate 285 of the spring airbag pad 284, squeezing the spring airbag pad 284 so that the gas inside it is injected into the centering airbag strip 281 through the delivery pipe 282 and the diversion pipe 283. The centering airbag strip 281 expands and extends out from the mounting groove 28, and contacts the actuator body 15. If the actuator body 15 is not in the center position, the centering airbag strip 281 will first contact the actuator body 15 to the side that is offset. The reaction force generated by continuous inflation pushes the actuator body 15 to move towards the center position until the centering airbag strip 281 evenly wraps the surface of the actuator body 15, realizing automatic centering calibration. Furthermore, by wrapping the actuator body 15 with the central airbag strip 281, it can effectively play a role in damping vibration. When the actuator body 15 is working, it can effectively absorb the vibration energy generated by it, reduce the interference of vibration on the test results, and further improve the stability and reliability of the test data. During the test, the control platform outputs control commands to drive the actuator under test to complete the action: when the actuator extends, it pushes the test rod 12 to transmit the loading force, and when the actuator retracts, it pulls the test rod 12 to form a reverse loading. Throughout the test, high-precision sensors are used to collect and transmit loading force and torque data in real time. The indicator device 14 of the test bench synchronously and dynamically displays various loading data, providing intuitive feedback on the load change status during the test. After the test, the output of the servo motor 255 reverses, causing the push plate 25 to reset and releasing the limit of the push rod 251 on the fixed plate 21. The spring airbag 284 then returns to its initial state under its own elasticity, allowing the gas in the centering airbag strip 281 to flow back to the spring airbag 284, after which the actuator body 15 under test can be easily removed. This installation structure enables rapid assembly and disassembly of the actuator body 15, greatly shortening the clamping time, and significantly improving overall testing efficiency, especially in batch testing scenarios. Simultaneously, the automatic centering calibration function ensures that the actuator is in the optimal testing position for each test, effectively improving the accuracy and repeatability of the test results. Furthermore, the entire installation structure adopts a modular design, with tight connections between components and easy maintenance, reducing maintenance costs and difficulties during later use.

Claims

1. A linear actuator test bench, comprising a test bench body (1), characterized in that: A loading device (11) is fixed at the upper end of the test bench. A test rod (12) is installed on one side of the loading device (11). A weight rack (13) is fixed on the side of the loading device (11) away from the test rod (12). An indicator device (14) is fixed at the upper end of the test bench body (1). An actuator body (15) is provided at the upper end of the test bench body (1). A power supply box (16) is provided on the side of the test bench body (1). A control platform (17) is fixed at the upper end of the power supply box (16). The control platform (17) is electrically connected to the loading device (11), the indicator device (14), and the actuator body (15). An installation structure for quick assembly and disassembly of the actuator body (15) is provided at the upper end of the test bench.

2. The linear actuator test bench according to claim 1, characterized in that: The installation structure includes an installation base (2) fixed to the upper end of the test bench body (1). Two symmetrically arranged fixing plates (21) are installed on the upper end of the installation base (2). An arc-shaped fixing groove is opened on the opposite side of the two fixing plates (21). Two symmetrically arranged support plates (22) are fixed on the upper end of the installation base (2). Multiple telescopic sleeves (23) are fixed on the side of the support plates (22). The side of the telescopic sleeve (23) away from the support plate (22) is fixedly connected to the fixing plate (21). A support spring (24) is slidably sleeved on the telescopic sleeve (23). The two ends of the support spring (24) are fixedly connected to the fixing plate (21) and the support plate (22) respectively. A limit component is provided between the installation base (2) and the fixing plate (21). A centering component is provided between the fixing plate (21) and the support plate (22).

3. The linear actuator test bench according to claim 2, characterized in that: The limiting component includes a push plate (25) installed on the upper end of the mounting base (2). There are two push plates (25) arranged symmetrically. A push rod (251) is fixed on the side of the push plate (25). Two symmetrically arranged movable slots (252) are opened on the upper end of the mounting base (2). A bidirectional ball screw (253) is rotatably connected inside the mounting base (2). A nut seat (254) adapted to the bidirectional ball screw (253) is fixed on the lower end of the push plate (25). The nut seat (254) is sleeved on the bidirectional ball screw (253). A servo motor (255) is fixed on the side of the mounting base (2). The output end of the servo motor (255) extends into the movable slot (252) and is fixedly connected to the bidirectional ball screw (253). The servo motor (255) is electrically connected to the control platform (17). A guide is provided inside the mounting base (2).

4. A linear actuator test bench according to claim 3, characterized in that: The guide includes a guide roller (256) rotatably connected to the lower end of the nut seat (254). The bottom of the movable groove (252) is provided with a guide groove (257). The guide roller (256) extends into the guide groove (257), and the surface of the guide roller (256) is in contact with the inner wall of the guide groove (257).

5. A linear actuator test bench according to claim 3, characterized in that: A pressure sensor (26) is embedded and fixed at one end of the push rod (251) away from the push plate (25), and the pressure sensor (26) is electrically connected to the control platform (17).

6. A linear actuator test bench according to claim 2, characterized in that: The fixed plate (21) has a guide plate (27) fixed on its side. The guide plate (27) is arc-shaped and inclined.

7. A linear actuator test bench according to claim 3, characterized in that: The centering component includes an installation slot (28) inside a fixed plate (21). Two installation slots (28) are opened inside one fixed plate (21). A centering airbag strip (281) is fixed inside the installation slot (28). A delivery pipe (282) is fixed inside the support plate (22). One end of the delivery pipe (282) away from the support plate (22) extends into the fixed plate (21) and is fixed with a diversion pipe (283). The diversion pipe (283) is fixedly connected to the centering airbag strip (281). An inflation component is provided on the side of the support plate (22).

8. A linear actuator test bench according to claim 7, characterized in that: The inflatable component includes a spring airbag pad (284) fixed to the side of the support plate (22). The spring airbag pad (284) is fixedly connected to the delivery pipe (282). The spring airbag pad (284) and the centering airbag strip (281) are connected through the delivery pipe (282) and the diversion pipe (283). A contact plate (285) is fixed on the side of the spring airbag pad (284) away from the support plate (22). A squeezing rod (286) is fixed on the side of the push plate (25). The squeezing rod (286) is positioned opposite to the contact plate (285).

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