Push rod load testing device

Abstract

The invention provides a push rod load test device, which comprises a test board, a push rod mounting seat, an actuator mounting seat, an actuator, a joint assembly and a displacement sensor, and is characterized in that the push rod mounting seat and the actuator mounting seat are fixedly mounted on the test board and are distributed along a first direction, and the actuator comprises a fixed part and an acting part; the fixed part is fixedly mounted on the actuator mounting seat, the connector assembly comprises a support, a linear guide rail and a connector, the linear guide rail comprises a guide rail and a sliding block, the linear direction of the guide rail is parallel to the moving direction of the action part, the support is connected with the sliding block and the action part, and the connector is connected with the end, away from the fixed part, of the action part. The displacement sensor is connected with the support and / or the sliding block. According to the invention, push-pull force or load force is applied to the rod body through the actuator, whether the rod body has displacement in the test process is monitored through the displacement sensor, and the displacement value is recorded, so that the performance of the push rod under different load conditions is detected.

Description

Technical Field

[0001] This application belongs to the field of solar power generation, and specifically relates to a push rod load testing device. Background Technology

[0002] As global demand for power generation from new energy sources continues to increase, more and more photovoltaic tracking systems are being applied to photovoltaic power generation scenarios, and more and more solar thermal heliostat power plants are being built and put into operation.

[0003] In photovoltaic (PV) tracking systems, the electric actuator is the power source that drives the entire PV panel array to change angles. Through the extension and retraction of the electric actuator, the PV panels are always aligned with the sun, increasing power generation by 15% to 30% compared to fixed PV systems. In solar thermal heliostat power generation, the electric actuator is the core component driving each heliostat to perform extremely precise two-dimensional rotations (azimuth and elevation angles). This ensures that the light reflected from all heliostats accurately hits the receiver at the top of the distant tower. This precision directly determines the efficiency and normal operation of the power station. Therefore, whether pursuing the "quantity" of PV tracking or the "quality" of solar thermal concentration, the electric actuator is a seemingly simple but indispensable core actuator, guaranteeing the efficient, stable, and intelligent operation of solar power plants.

[0004] Electric linear actuators face various loads during operation, including heavy loads, light loads, and scenarios requiring static self-locking in extremely windy conditions. Therefore, it is necessary to test the stability, safety, and reliability of the actuator under different conditions. Summary of the Invention

[0005] This application aims to at least partially solve one of the technical problems in the related art. To this end, the main technical solutions adopted in this application include:

[0006] This application provides a push rod load testing device, including a test bench, a push rod mounting base, an actuator mounting base, an actuator, a connector assembly, and a displacement sensor. The push rod mounting base and the actuator mounting base are both fixedly mounted on the test bench and are distributed along a first direction. The actuator includes a fixed part and an actuating part. The fixed part is fixedly mounted on the actuator mounting base. The connector assembly is disposed between the push rod mounting base and the actuator mounting base. The connector assembly includes a support, a linear guide rail, and a connector. The linear guide rail includes a guide rail and a slider. The linear direction of the guide rail is fixedly mounted on the test bench along the first direction, and the linear direction of the guide rail is parallel to the moving direction of the actuating part. The support is connected to the slider and the actuating part. The connector is connected to the actuating part at the end away from the fixed part. The displacement sensor is connected to the support and / or the slider.

[0007] The push rod load testing device provided in this application connects the actuator's moving part, which is installed on the actuator mounting base, and the push rod body, which is installed on the push rod mounting base, through a connector assembly during the push rod testing process. The actuator applies a push or pull force or load force to the rod body, and a displacement sensor monitors whether the rod body is displaced during the test and records the displacement value to detect the performance of the push rod under different load conditions, so as to achieve the purpose of testing the stability, safety and reliability of the push rod under different conditions. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a structural diagram of the push rod load testing device provided in the embodiments of this application;

[0010] Figure 2 for Figure 1 Enlarged view of section C in the middle circle;

[0011] Figure 3 This is a front view of the push rod load testing device provided in the embodiments of this application;

[0012] Figure 4 This is a top view of the push rod load testing device provided in the embodiments of this application;

[0013] Figure 5 This is a structural diagram of the actuator control system provided in an embodiment of this application. Detailed Implementation

[0014] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0015] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0016] Whether pursuing the "quantity" of photovoltaic tracking or the "quality" of concentrated solar power (CSP), the electric actuator is a seemingly simple yet indispensable core component, ensuring the efficient, stable, and intelligent operation of solar power plants. During operation, electric actuators face scenarios involving high and low loads, as well as static self-locking under extreme wind conditions. Especially in CSP plants, the pitch angle of the heliostat mirrors relies entirely on the actuator, making performance testing under high loads particularly crucial. Therefore, it is necessary to test the actuator's stability, safety, and reliability under various conditions.

[0017] For this purpose, please refer to Figures 1 to 5 This embodiment proposes a push rod load testing device, including a test bench 1, a push rod mounting base 2, an actuator mounting base 3, an actuator 4, a connector assembly 5, and a displacement sensor 6. The push rod mounting base 2 and the actuator mounting base 3 are both fixedly mounted on the test bench 1, and are distributed along a first direction X. The actuator 4 includes a fixing part 4a and an actuating part 4b. The fixing part 4a is fixedly mounted on the actuator mounting base 3. The connector assembly 5 is disposed between the push rod mounting base 2 and the actuator mounting base 3. 5 includes a support 51, a linear guide rail 52, and a connector 53. The linear guide rail 52 includes a guide rail 52a and a slider 52b. The linear direction of the guide rail 52a is fixedly installed on the test bench 1 along a first direction X, and the linear direction of the guide rail 52a is parallel to the moving direction of the actuating part 4b. The support 51 is connected to the slider 52b and the actuating part 4b. The connector 53 is connected to the actuating part 4b at the end away from the fixed part 4a. The displacement sensor 6 is connected to the support 51 and / or the slider 52b.

[0018] In this embodiment, the push rod load testing device connects the actuating part 4b of the actuator 4 installed on the actuator mounting base 3 and the rod body 101 of the push rod 100 installed on the push rod mounting base 2 through the connector assembly 5. The actuator 4 applies a push-pull force or load force to the rod body 101, and the displacement sensor 6 monitors whether the rod body 101 has creep during the test and records the displacement value to detect the performance of the push rod under different load conditions, so as to achieve the purpose of testing the stability, safety and reliability of the push rod under different conditions.

[0019] In this embodiment, the push rod mounting base 2 is used to fix the push rod 100, and the connector 53 is used to connect the rod body 101 of the test push rod 100 and the actuating part 4b of the actuator 4. During testing, the test push rod 100 is mounted on the push rod mounting base 2 and fixed. The center lines of the rod body 101 of the push rod 100, the connector 53, and the actuating part 4b of the actuator 4 are on the same straight line to avoid lateral forces and ensure the accuracy of the test results.

[0020] Specifically, the length direction of the test bench 1 is defined as the first direction X. The push rod mounting base 2 and the actuator mounting base 3 are distributed along the length direction of the test bench 1, and the guide rail 52a is located between the push rod mounting base 2 and the actuator mounting base 3. In other words, the rod body 101 of the push rod 100, the connector 53, and the actuating part 4b of the actuator 4 are distributed along the length direction of the test bench 1, and their center lines are on the same straight line. During the test, the actuator 4's actuating part 4b is controlled to perform an action, applying pressure or tension, which is transmitted to the rod body 101 of the push rod 100 through the connector 53. Throughout the process, the force value is monitored in real time, and the displacement sensor 6 monitors whether the rod body 101 of the push rod 100 has any creep or change, and records the displacement value.

[0021] Please refer to the following: Figure 2 The displacement sensor 6 is a grating ruler. The displacement sensor 6 includes a ruler body 6a fixedly installed on the test bench 1 and a reading head 6b connected to the support 51 and / or slider 52b. The ruler body 6a is arranged parallel to the guide rail 52a, and the reading head 6b can move along the ruler body 6a.

[0022] During the test, when the load force applied to the rod 101 of the push rod 100 causes the rod 101 to creep or change, it will drive the reading head 6b to move along the scale body 6a through the support 51 and / or slider 52b. The displacement sensor 6 also includes a signal processing unit located at the reading head 6b. In this embodiment, the scale body 6a is the reference component of the grating scale, which is a long scale fixedly installed on the test bench 1; the reading head 6b is the moving and sensing component of the grating scale, which is connected to the support 51 and / or slider 52b. During the test, it moves along the guide rail 52a with the support 51 and / or slider 52b; the signal processing unit is responsible for processing the generated raw signal to obtain high-precision position data, which is transmitted to the control terminal (not shown in the figure) in real time through the interface.

[0023] In some implementations, the reading head 6b is connected to the support 51. See [link to specific implementation details] for details. Figure 2 The push rod load testing device includes a connecting plate 7, which connects the support 51 and the reading head 6b. During the test, if the push rod 100 creeps, moves, or deforms, it will cause the support 51 to slide along the guide rail 52a, which in turn will cause the reading head 6b to move along the scale body 6a through the connecting plate 7, generating a displacement signal.

[0024] In this embodiment, the actuator 4 can be a pneumatic cylinder or a hydraulic cylinder. For a specific implementation, please refer to [reference needed]. Figure 5The actuator 4 is a cylinder, which includes a cylinder barrel 4a1 as a fixed part 4a, a piston rod 4b1 as an actuating part 4b, and a piston 4c located inside the cylinder barrel 4a1. In this embodiment, the push rod is tested under wind load conditions by adjusting the air pressure. Compared with a hydraulic cylinder, using a cylinder to adjust the load force can simultaneously handle both large and small loads and can also achieve precise control. The hydraulic adjustment method is more suitable for large loads (such as 20KN, 30KN, etc.) and is difficult to handle 2KN and 3KN forces simultaneously. In addition, hydraulic drive has inertia, and collisions with the push rod body are inevitable during full-stroke testing. The hydraulic system has the risk of oil leakage, which increases environmental pollution and treatment costs.

[0025] In this embodiment, the support 51 is provided with a through hole 51a along the first direction X. The through hole 51a is concentrically arranged with the piston rod 4b1, and the piston rod 4b1 passes through the through hole 51a and connects to the connector 53. In this application, the piston rod 4b1 is directly connected to the connector 53, so that the load force can be directly transmitted to the rod body 101 of the push rod through the connector 53. The support 51 and the piston rod 4b1 are relatively fixed, for example, the piston rod 4b1 is tightly fitted with the through hole 51a of the support 51, or the piston rod 4b1 and the support 51 are connected by fasteners, or the piston rod 4b1 is provided with a shoulder, and the support 51 is clamped and fixed by the shoulder and the connector 53. In this way, during the test, the support 51 can follow the creep, movement or deformation of the push rod 100.

[0026] Please refer to the following: Figure 1 , Figure 4 and Figure 5 In this embodiment, the push rod load testing device further includes an actuator control system 8 and a fluid power device 9. When the actuator 4 uses a hydraulic cylinder, the fluid power device 9 and the actuator control system 8 respectively use a hydraulic pump and a hydraulic control system, with liquid as the power transmission medium; when the actuator 4 uses a pneumatic cylinder, the fluid power device 9 and the actuator control system 8 respectively use an air pump and a pneumatic control system, with gas as the power transmission medium.

[0027] In this embodiment, a cylinder is used as the actuator 4 for description. The actuator control system 8 includes a pressure reducing valve 81, a switching valve 82, and a solenoid valve 83. The pressure reducing valve 81 is connected to the fluid power device 9 and the switching valve 82, and the switching valve 82 is connected to the pressure reducing valve 81 and the solenoid valve 83. The solenoid valve 83 includes a first interface 83a, a second interface 83b, and a third interface 83c. The first interface 83a is connected to the switching valve 82. The actuator 4 includes a first cavity 41 and a second cavity 42. The first cavity 41 is located away from the actuating part 4b. The actuator 4 is provided with a first connection port A communicating with the first cavity 41 and a second connection port B communicating with the second cavity 42. The second interface 83b is connected to the first connection port A, and the third interface 83c is connected to the second connection port B. In addition, the solenoid valve 83 also includes an exhaust port. The solenoid valve 83 has a first working state and a second working state. In the first working state, the first interface 83a is connected to the second interface 83b, and the third interface 83c is connected to the exhaust port. In the second working state, the first interface 83a is connected to the third interface 83c, and the second interface 83b is connected to the exhaust port.

[0028] During the test, the air pump, which acts as the fluid power device 9, generates compressed air and delivers it to the pressure reducing valve 81. The pressure reducing valve 81 stabilizes the high-pressure gas from the air pump to a set, usable working pressure, and then the gas passes through the switching valve 82 to the first port 83a of the solenoid valve 83. The air circuit can be connected or disconnected by controlling the switching valve 82.

[0029] In the first working state (i.e., the actuator 4 applies a thrust to the push rod 100), the first interface 83a and the second interface 83b are connected. The compressed gas enters the first cavity 41 (i.e., the rodless cavity) through the first interface 83a and the second interface 83b and then through the first connection port A, pushing the piston rod 4b1 to extend and apply pressure to the push rod 100. The gas in the second cavity 42 (i.e., the rod cavity) flows to the exhaust port for exhaust after passing through the second connection port B and the third interface 83c.

[0030] In the second working state (i.e., the actuator 4 applies a pulling force to the push rod 100), the first interface 83a and the third interface 83c are connected. The compressed gas enters the second cavity 42 (i.e., the rod cavity) through the first interface 83a and the third interface 83c and then through the second connection port B. This pushes the piston rod 4b1 to retract and applies a pulling force to the push rod 100. The gas in the first cavity 41 (i.e., the rodless cavity) flows to the exhaust port for exhaust after passing through the first connection port A and the second interface 83b.

[0031] In this embodiment, the actuator control system 8 further includes a silencer 84, which is installed at the exhaust port of the solenoid valve 83. The gas discharged from the exhaust port of the first chamber 41 / second chamber 42 is first silenced by the silencer 84 to reduce the loud noise generated when compressed air is discharged.

[0032] In the above embodiment, the solenoid valve 83 is a two-position five-way solenoid valve, with an exhaust port including a first exhaust port and a second exhaust port. The silencer 84 includes a first silencer 84a and a second silencer 84b, with the first silencer 84a installed at the first exhaust port and the second silencer 84b installed at the second exhaust port. Specifically, in the first operating state, the gas in the second chamber 42 (i.e., the rod chamber) is discharged after being silenced by the second silencer 84b; in the second operating state, the gas in the first chamber 41 (i.e., the rodless chamber) is discharged after being silenced by the first silencer 84a. Of course, the solenoid valve 83 can also be a two-position three-way solenoid valve.

[0033] In this embodiment, the actuator control system 8 further includes a pressure switch 85, which is installed on a pressure reducing valve 81. The pressure reducing valve 81 is a filter pressure reducing valve. The filter pressure reducing valve is responsible for providing clean and stable compressed air. After filtration and pressure stabilization, the compressed air flows to the solenoid valve 83 after passing through the pressure switch 85. The pressure switch 85 serves as a low-pressure protection and high-pressure protection mechanism. When the air pressure is lower than the minimum value set by the pressure switch or when the pressure exceeds the set safety upper limit, the pressure switch 85 will send a signal to the terminal device connected to the actuator control system 8 to perform corresponding actions (such as cutting off the air supply or stopping the equipment). In this embodiment, the switching valve 82 is a manual switching valve. When maintenance, replacement, or debugging of the solenoid valve, cylinder, or related mechanical components is required, or when a downstream component such as a ruptured air pipe or a damaged solenoid valve causes serious leakage, this switching valve serves as a reliable manual cut-off point, completely isolating the entire downstream circuit (including the solenoid valve, cylinder, etc.) from the main air source, providing safe conditions for subsequent processing.

[0034] In the above embodiment, the actuator control system 8 further includes a first flow rate valve 86 and a first pressure gauge 87 installed on the connecting pipe between the first connection port A and the second interface 83b; and a second flow rate valve 88 and a second pressure gauge 89 installed on the connecting pipe between the second connection port B and the third interface 83c. In this embodiment, by installing throttle valves on both interfaces of the cylinder, the speed of piston rod extension and retraction is controlled respectively; the pressure gauge is used to monitor and display the air pressure value to ensure that the pressure value supplied to the cylinder is consistent with the system set value, which is the basis for the normal operation of the system.

[0035] More specifically, compared to the first pressure gauge 87, the first flow valve 86 is closer to the second port 83b in terms of flow path; compared to the second pressure gauge 89, the second flow valve 88 is closer to the third port 83c in terms of flow path.

[0036] Please refer to it again. Figure 4 In this embodiment, the test bench 1 is a robust steel structure frame capable of easily withstanding forces exceeding 30kN without deformation. The test bench 1 includes a base 11 and a tabletop 12. The tabletop 12 is mounted on the base 11, and the push rod mounting seat 2, actuator mounting seat 3, connector assembly 5, and displacement sensor 6 are all mounted on the tabletop 12. In this embodiment, the table body of the base 11 is welded from square tubing, and the tabletop support is welded to the table body using long and wide tabletop channel steel. The tabletop 12 can be constructed from a single base plate connected to the base 11, or it can be composed of multiple base plates joined together.

[0037] Furthermore, the test bench 1 in this embodiment also includes a mounting box 13 located below the tabletop 12, and the actuator control system 8 is at least partially mounted in the mounting box 13. In this embodiment, the mounting box 13 has a drawer structure. When the control system malfunctions, such as loose wiring or damaged components, maintenance personnel do not need to crawl under the workbench or bend over to probe. They can simply pull out the entire control module like pulling out a drawer for inspection and repair. At the same time, hiding complex wiring harnesses and components inside the drawer makes the workbench look simple and also prevents accidental bumps and pulls.

[0038] During the static load test of the push rod, the rod body 101 of the push rod 100 is extended to the middle or fully extended position. The outer shell 102 of the rod body 101 is firmly installed on the push rod mounting base 2. The rod body 101 is connected to the actuating part 4b of the actuator 4 through the connector 53. The actuating part 4b and the rod body 101 are made concentric and coaxial to avoid lateral forces. The high-pressure gas from the air pump is stabilized to a set value (e.g., 30kN) by the pressure reducing valve 81. The switch valve 82 is opened, and the gas is delivered to the first chamber 41 (applying pressure) / to the second chamber 42 (applying tension) after passing through the solenoid valve 83. The pressure value is detected by the pressure gauge. After reaching 30kN, the load is maintained for a period of time (e.g., 30 seconds to 5 minutes). During the entire process, the displacement sensor 6 monitors whether there is any slight displacement or creep of the push rod. The signal detected by the displacement sensor 6 is sent to the terminal device, which records and displays it. After the test, the solenoid valve 83 is controlled to slowly unload the load. The push rods 102 and 101 are checked for permanent deformation, cracks or other damage. If there is no structural damage and the displacement change or creep during the load maintenance period is less than the specified value, then the push rod 100 is considered to have normal test function.

[0039] During the dynamic load test of the push rod, a load curve (e.g., a sine wave varying between 1kN and 4kN) is pre-set in the control system of the terminal equipment, and the motion program of the push rod is set (e.g., a cycle from extension to retraction and then extension). During the test, the load direction should always be opposite to the push rod's motion direction to simulate a real load, allowing the push rod to run continuously under the set dynamic load. A complete set of data is recorded at regular intervals, including time, running position, and actual load. The running speed is calculated by the terminal equipment, and data on the running speed and actual load at different time points are obtained. In addition, the current and voltage data of the push rod can also be monitored. After the test, the load is slowly removed by controlling the solenoid valve 83. The temperature of the push rod motor and gearbox is checked to see if it stabilizes and whether it exceeds the maximum allowable temperature, such as 80℃ or 105℃; whether the running current is stable and whether there is an abnormal increase; and whether the running speed decreases significantly under the same load. These checks are used to test the durability, reliability, and performance stability of the push rod.

[0040] Some of the technical implementation methods described above can be combined or replaced.

[0041] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] The technical principles of this application have been described above in conjunction with specific embodiments. However, it should be noted that these descriptions are merely for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, other specific embodiments or equivalent substitutions of this application that can be conceived by those skilled in the art without creative effort will fall within the scope of protection of this application.

Claims

1. A push rod load testing device, characterized in that: The device includes a test bench, a push rod mounting base, an actuator mounting base, an actuator, a connector assembly, and a displacement sensor. The push rod mounting base and actuator mounting base are both fixedly mounted on the test bench and are distributed along a first direction. The actuator includes a fixed part and an actuating part. The fixed part is fixedly mounted on the actuator mounting base. The connector assembly is disposed between the push rod mounting base and the actuator mounting base. The connector assembly includes a support, a linear guide rail, and a connector. The linear guide rail includes a slidingly fitted guide rail and a slider. The linear direction of the guide rail is fixedly mounted on the test bench along the first direction, and the linear direction of the guide rail is parallel to the moving direction of the actuating part. The support is connected to the slider and the actuating part. The connector is connected to the actuating part at the end away from the fixed part. The displacement sensor is connected to the support and / or the slider.

2. The push rod load testing device according to claim 1, characterized in that: The push rod mounting base is used to fix the push rod; the length direction of the test bench is defined as the first direction, the push rod mounting base and the actuator mounting base are distributed along the length direction of the test bench, and the guide rail is located between the push rod mounting base and the actuator mounting base.

3. The push rod load testing device according to claim 1, characterized in that: The displacement sensor is a grating ruler. The displacement sensor includes a ruler body fixedly installed on the test bench and a reading head connected to the support and / or slider. The ruler body is arranged parallel to the guide rail, and the reading head can move along the ruler body.

4. The push rod load testing device according to claim 3, characterized in that: The push rod load testing device includes a connecting plate, which connects to a support and a reading head; the displacement sensor also includes a signal processing unit, which is located inside the reading head.

5. The push rod load testing device according to claim 1, characterized in that: The actuator is a cylinder, which includes a cylinder barrel as a fixed part, a piston rod as an actuating part, and a piston located inside the cylinder barrel. One end of the piston rod is connected to the piston, and the other end extends out of the cylinder barrel and is connected to a connector.

6. The push rod load testing device according to claim 5, characterized in that: The support is provided with a through hole along the first direction. The through hole is concentric with the piston rod, and the piston rod passes through the through hole to connect with the connector.

7. The push rod load testing device according to any one of claims 1 to 6, characterized in that: The push rod load testing device also includes an actuator control system and a fluid power device. The actuator control system includes a pressure reducing valve, a switching valve, and a solenoid valve. The pressure reducing valve is connected to the fluid power device and the switching valve, and the switching valve is connected to the pressure reducing valve and the solenoid valve. The solenoid valve includes a first interface, a second interface, and a third interface. The first interface is connected to the switching valve. The actuator includes a first cavity and a second cavity. The first cavity is located away from the actuating part. The actuator is provided with a first connection port communicating with the first cavity and a second connection port communicating with the second cavity. The second interface is connected to the first connection port, and the third interface is connected to the second connection port. The solenoid valve also includes an exhaust port. The solenoid valve has a first working state and a second working state. In the first working state, the first interface is connected to the second interface and the third interface is connected to the exhaust port. In the second working state, the first interface is connected to the third interface and the second interface is connected to the exhaust port.

8. The push rod load testing device according to claim 7, characterized in that: The actuator control system also includes a muffler, which is installed at the exhaust port of the solenoid valve; The actuator control system also includes a pressure switch, which is installed on a pressure reducing valve, and the pressure reducing valve is a filter pressure reducing valve.

9. The push rod load testing device according to claim 7, characterized in that: The actuator control system further includes a first flow valve and a first pressure gauge installed on the pipeline connecting the first connection port and the second interface. The actuator control system also includes a second flow rate valve and a second pressure gauge installed on the connecting pipe between the second connection port and the third interface.

10. The push rod load testing device according to claim 7, characterized in that: The test bench includes a base and a table surface. The table surface is mounted on the base, and the push rod mounting seat, actuator mounting seat, connector assembly, and displacement sensor are all mounted on the table surface. The test bench also includes a mounting box located below the test surface, and the actuator control system is at least partially mounted in the mounting box.

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