Shock absorber hydraulic servo test system

Abstract

The utility model discloses a shock absorber hydraulic servo test system, comprising an oil supply system comprising an oil tank, and a first oil supply unit, a second oil supply unit and a third oil supply unit which are communicated with the oil tank; the testing system comprises an oil cylinder, a first testing oil way, a second testing oil way and a third testing oil way, the first testing oil way is communicated with the first oil supply unit, the second testing oil way is communicated with the second oil supply unit, and the third testing oil way is communicated with the third oil supply unit. The second test oil path and the third test oil path are communicated with the oil cylinder through the same servo valve; the damper body is located at the output end of the oil cylinder. The loop of the oil supply system is matched with the test system to realize high-precision oil supply, high-precision control of displacement of the oil cylinder and high-precision control of speed are realized, and high-frequency test task execution of the oil cylinder is realized; the oil supply system is provided with a circulating filtering and cooling system, so that the cleanness and constant temperature of a test oil path are ensured, and the accuracy of a test result is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic testing, and in particular relates to a shock absorber hydraulic servo testing system. Background Art

[0002] Shock absorbers are used to dampen the rebound oscillations caused by springs absorbing shock and to mitigate impacts from the road. They are widely used in automobiles to accelerate the attenuation of frame and body vibrations, thereby improving the vehicle's ride smoothness. To meet increasing vehicle demands and balance comfort and handling according to varying road conditions, the demand for shock absorber quality is increasing. The quality of shock absorbers is crucial, as they affect the vehicle's smoothness during driving, so shock absorber performance testing is essential to determine their compliance.

[0003] However, current traditional testing solutions are relatively simple and can only roughly test basic performance. They cannot precisely control the displacement, speed, and high frequency of the actuator during testing, resulting in low test accuracy. Therefore, a shock absorber hydraulic servo test system was designed to address these issues.

[0004] It should be noted that the above technical background is merely for the purpose of providing a clear and complete description of the technical solutions of the present invention and to facilitate understanding by those skilled in the art. It should not be assumed that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present invention. Utility Model Content

[0005] In order to overcome the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a shock absorber hydraulic servo test system.

[0006] To achieve the above and other related purposes, the present invention provides a technical solution: a shock absorber hydraulic servo test system, comprising:

[0007] An oil supply system, the oil supply system comprising an oil tank and a first oil supply unit, a second oil supply unit, and a third oil supply unit connected to the oil tank;

[0008] A test system comprising a cylinder and a first test oil circuit, a second test oil circuit, and a third test oil circuit connected to the cylinder, wherein the first test oil circuit is a pilot oil circuit and is connected to the first oil supply unit, the second test oil circuit is a power oil circuit and is connected to the second oil supply unit, and the third test oil circuit is a return oil circuit and is connected to the third oil supply unit. The second test oil circuit and the third test oil circuit are connected to the cylinder through the same servo valve and drive the cylinder to perform telescopic movement;

[0009] A shock absorber body is arranged at the output end of the oil cylinder.

[0010] During testing, the other end of the shock absorber body is provided with a support, which can be a fixing member or an oil cylinder; when the oil cylinder is used as an actuator, the shock absorber body is subjected to high-frequency output. In some embodiments, the output end of the oil cylinder is further provided with a force sensor for recording the size of the output force, and a displacement sensor is arranged behind the oil cylinder to facilitate the test system to test the displacement force curve and the displacement speed curve of the shock absorber body.

[0011] Further, the first oil supply unit comprises a first oil inlet pipe, a first pump body, a first check valve, a pressure reducing valve and a first filter are sequentially arranged on the first oil inlet pipe along the length direction of the first oil inlet pipe; a first pressure control unit and a first return pipe in communication with the oil tank are arranged on the first oil inlet pipe between the first pump body and the first check valve, and a first overflow valve is arranged on the first return pipe; the first pressure control unit comprises a first pressure switch and a first pressure gauge. In this scheme, the first oil supply unit supplies oil to the pilot oil circuit of the test system, and the piston rod of the oil cylinder is extended during oil supply, and the first oil supply unit supplies oil stably, thereby ensuring the test requirements of the pilot oil circuit.

[0012] Further, a first accumulator is arranged on the first oil inlet pipe between the first check valve and the pressure reducing valve. In this scheme, the accumulator can maintain a certain pressure for a certain period of time, stabilize the pressure in the circuit, prevent the front end of the circuit from consuming too much oil and not being able to supply in time, and ensure the accuracy of the test results.

[0013] Further, the second oil supply unit comprises a second oil inlet pipe, a second pump body, a second check valve, a second filter and a first manual ball valve are sequentially arranged on the second oil inlet pipe along the length direction of the second oil inlet pipe; a second pressure control unit and a second return pipe and an auxiliary return pipe in communication with the oil tank are arranged on the second oil inlet pipe between the second check valve and the second filter, a proportional overflow valve is arranged on the second return pipe, and a second overflow valve is arranged on the auxiliary return pipe; the second pressure control unit comprises a second pressure gauge and a second pressure switch connected in sequence on the second oil inlet pipe along the oil supply direction. In this scheme, the second oil supply unit supplies oil to the power oil circuit of the test system, and the piston rod of the oil cylinder is extended and retracted through the servo valve during oil supply; the proportional overflow valve and other overflow valves in the second oil supply unit are used to cooperate with the servo valve of the test system to control oil, so that the oil supply is accurate and stable, thereby ensuring the test requirements of the power oil circuit, realizing high-precision control of the displacement of the oil cylinder and the speed of the oil cylinder, and realizing control of the high-frequency execution test requirements of the oil cylinder.

[0014] Furthermore, the second pressure switch is connected to the second accumulator. In this solution, the accumulator can maintain a certain pressure for a certain period of time, stabilize the pressure in the circuit, and ensure the accuracy of the test results.

[0015] Furthermore, the third oil supply unit includes a third oil inlet pipe, which is sequentially provided along its length with a third pump body, a third one-way valve, a heat exchanger, and a fourth one-way valve. The third oil inlet pipe is provided with a third pressure switch and a third return pipe connected to the oil tank, located between the third pump body and the third one-way valve. The third return pipe is also provided with a third overflow valve. In this solution, the third oil supply unit supplies oil to the return oil circuit of the test system. This circuit achieves cyclic cooling of the return oil after testing, ensuring stable oil temperature, better regulating oil pressure, and ensuring the accuracy of test results.

[0016] Furthermore, a fourth return pipe connected to the fuel tank is provided on the third oil inlet pipe between the heat exchanger and the fourth one-way valve. A third filter is provided on the fourth return pipe. This solution achieves cyclic filtration of the return oil after testing, preserving the cleanliness of the test oil, improving hydraulic control precision, and ensuring the accuracy of test results.

[0017] Furthermore, the heat exchanger is connected to a refrigeration unit, which includes a water chiller equipped with a water inlet pipe and a drain pipe. The water inlet pipe, after passing through the water chiller, is connected to the water inlet of the heat exchanger. A flow meter, a thermometer, a first air-controlled ball valve, and a throttle valve are sequentially installed on the side of the water inlet pipe away from the heat exchanger along the direction of water flow. The drain pipe, after passing through the water chiller, is connected to the water outlet of the heat exchanger. A second air-controlled ball valve is installed on the side of the drain pipe close to the heat exchanger. In this solution, the post-test return oil is circulated and cooled by the chiller system, improving cooling efficiency and the accuracy of the test results.

[0018] Furthermore, the oil tank is equipped with an air filter and a liquid level and temperature sensor. In this solution, the air filter can effectively remove or reduce solid particles, microorganisms, or other harmful substances in the air inside the oil tank, ensuring the cleanliness of the test oil. The liquid level and temperature sensor can monitor the temperature of the test oil entering the oil inlet pipe and then feed it back to the oil temperature controller, so that the oil temperature controller can further adjust the test oil temperature to meet the test requirements.

[0019] Furthermore, a liquid level gauge is provided on the side of the oil tank, and an oil drain pipe is connected to the lower end of the oil tank. The liquid level gauge and the oil drain pipe are provided on the same side, and a second manual ball valve is provided on the oil drain pipe. In this solution, the liquid level gauge is a level gauge that can be directly viewed by the eyes, which is convenient for observation.

[0020] Due to the application of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0021] 1. In the utility model, the oil supply system and the test system cooperate with each other. The oil supply system can continuously provide the test system with the test oil that meets the test requirements through the pump body and the valve body, thereby ensuring the test efficiency of the shock absorber valve.

[0022] 2. The circuit of the oil supply system of the utility model cooperates with the servo valve of the test system to achieve high-precision oil supply, high-precision control of the cylinder displacement and high-precision control of the speed, and high-frequency execution of the cylinder test task; the oil supply system has its own circulation filtration and cooling system to ensure the cleanliness and constant temperature of the test oil circuit, and ensure the accuracy of the test results; it is simple to operate and convenient to observe. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the oil supply system structure of the utility model;

[0024] Figure 2 This is a schematic diagram of the test system structure of the utility model;

[0025] Figure 3 This is a structural schematic diagram of the first oil supply unit of the present utility model;

[0026] Figure 4 This is a structural schematic diagram of the second oil supply unit of the present utility model;

[0027] Figure 5 This is a schematic structural diagram of the third oil supply unit of the present utility model;

[0028] In the above figures,

[0029] 1. First oil supply unit; 101. First oil inlet pipe; 102. First pump body; 103. First one-way valve; 104. Pressure reducing valve; 105. First filter; 106. First return pipe; 107. First relief valve; 108. First pressure switch; 109. First pressure gauge; 110. First accumulator;

[0030] 2. Second oil supply unit; 201. Second oil inlet pipe; 202. Second pump body; 203. Second check valve; 204. Second filter; 205. First manual ball valve; 206. Second return pipe; 207. Auxiliary return pipe; 208. Proportional relief valve; 209. Second relief valve; 210. Second pressure gauge; 211. Second pressure switch; 212. Second accumulator;

[0031] 3, third oil supply unit; 301, third oil inlet pipe; 302, third pump body; 303, third check valve; 304, heat exchanger; 305, fourth check valve; 306, third pressure switch; 307, third return pipe; 308, third overflow valve; 309, fourth return pipe; 310, third filter; 311, water cooler; 312, water inlet pipe; 313, water outlet pipe; 314, flow meter; 315, temperature meter; 316, first air control ball valve; 317, throttle valve; 318, second air control ball valve;

[0032] 4, oil cylinder; 5, first test oil circuit; 6, second test oil circuit; 7, third test oil circuit; 8, shock absorber body; 9, air filter; 10, liquid level and temperature sensor; 11, liquid level gauge; 12, oil drain pipe; 13, second manual ball valve. DETAILED DESCRIPTION

[0033] The implementation of the present application will be described by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the description.

[0034] It should be understood that, in the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance. The terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0035] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "provided", "mounted", "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0037] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0038] Example:

[0039] See attached Figure 1 and attached Figure 2 As shown, this embodiment provides a shock absorber hydraulic servo test system, including:

[0040] The oil supply system includes an oil tank and a first oil supply unit 1, a second oil supply unit 2 and a third oil supply unit 3 connected to the oil tank;

[0041] The test system includes a cylinder 4 and a first test oil circuit 5, a second test oil circuit 6, and a third test oil circuit 7 connected to the cylinder 4. The first test oil circuit 5 is a pilot oil circuit and is connected to the first oil supply unit 1. The second test oil circuit 6 is a power oil circuit and is connected to the second oil supply unit 2. The third test oil circuit 7 is a return oil circuit and is connected to the third oil supply unit 3. The second test oil circuit 6 and the third test oil circuit 7 are connected to the cylinder 4 through the same servo valve and drive it to perform telescopic movement;

[0042] Shock absorber body 8 is located at the output end of cylinder 4. During testing, a support is placed at the other end of shock absorber body 8. This support can be a fixed fixture or cylinder 4. Cylinder 4 acts as an actuator, generating a high-frequency output for shock absorber body 8. In some embodiments, a force sensor is also located at the output end of cylinder 4 to record the output force, facilitating the testing system to generate displacement-force and displacement-velocity curves of shock absorber body 8.

[0043] The first test oil circuit 5 is provided with a manual ball valve.

[0044] The second test oil circuit 6 and the third test oil circuit 7 are both provided with accumulators, which are located at the front end of the servo valve.

[0045] See attached Figure 3 As shown, the first oil supply unit 1 includes a first oil inlet pipe 101, on which a first pump body 102, a first one-way valve 103, a pressure reducing valve 104, and a first filter 105 are sequentially arranged along its length. A first pressure control unit and a first return pipe 106 connected to the oil tank are arranged between the first pump body 102 and the first one-way valve 103. The first return pipe 106 is equipped with a first relief valve 107. The first pressure control unit includes a first pressure switch 108 and a first pressure gauge 109. In this embodiment, the first oil supply unit 1 supplies oil to the pilot oil circuit of the test system. During oil supply, the piston rod of the oil cylinder 4 extends, and the first oil supply unit 1 provides stable oil supply, ensuring the testing requirements of the pilot oil circuit. The first pump body 102 is a circulating pump assembly.

[0046] A first accumulator 110 is provided on the first oil inlet pipe 101 between the first one-way valve 103 and the pressure reducing valve 104. In this embodiment, the accumulator can maintain a certain pressure for a certain period of time, stabilizing the pressure in the circuit, preventing excessive oil consumption at the front end of the circuit from being delayed, and ensuring the accuracy of the test results.

[0047] See attached Figure 4 As shown, the second oil supply unit 2 includes a second oil inlet pipe 201, on which a second pump body 202, a second one-way valve 203, a second filter 204 and a first manual ball valve 205 are sequentially arranged along its length direction;

[0048] A second pressure control unit, a second return pipe 206 and an auxiliary return pipe 207 connected to the oil tank are arranged on the second oil inlet pipe 201 between the second one-way valve 203 and the second filter 204. A proportional overflow valve 208 is arranged on the second return pipe 206, and a second overflow valve 209 is arranged on the auxiliary return pipe 207; the second pressure control unit includes a second pressure gauge 210 and a second pressure switch 211 connected to the second oil inlet pipe 201 in sequence along the oil supply direction.

[0049] In this embodiment, the second oil supply unit 2 supplies oil to the power oil circuit of the test system. During oil supply, the piston rod of the oil cylinder 4 is extended and retracted via a servo valve. A proportional relief valve 208 or other relief valve is provided in the second oil supply unit 2 to coordinate with the oil control of the servo valve of the test system. This ensures precise and stable oil supply, ensuring the testing requirements of the power oil circuit and achieving high-precision control of the displacement and speed of the oil cylinder 4, enabling high-frequency control of the test requirements. The second pump body 202 is a plunger pump.

[0050] The second pressure switch 211 is connected to the second accumulator 212. In this embodiment, the accumulator can maintain a certain pressure for a certain period of time, stabilize the pressure in the circuit, and ensure the accuracy of the test results.

[0051] See attached Figure 5 As shown, the third oil supply unit 3 includes a third oil inlet pipe 301, on which a third pump body 302, a third one-way valve 303, a heat exchanger 304 and a fourth one-way valve 305 are sequentially arranged along its length direction; a third pressure switch 306 and a third return pipe 307 connected to the oil tank are arranged on the third oil inlet pipe 301 between the third pump body 302 and the third one-way valve 303, and a third overflow valve 308 is arranged on the third return pipe 307.

[0052] In this embodiment, the third oil supply unit 3 supplies oil to the return oil circuit of the test system. This circuit achieves a circulating cooling of the return oil after the test, ensuring the oil temperature is stable, which can better regulate the oil pressure and ensure the accuracy of the test results. Among them, the third pump body 302 is a circulating pump group.

[0053] A fourth return pipe 309, connected to the oil tank, is provided on the third oil inlet pipe 301 between the heat exchanger 304 and the fourth one-way valve 305. A third filter 310 is provided on the fourth return pipe 309. In this embodiment, circulating filtration of the return oil after testing is achieved, preserving the cleanliness of the test oil, improving hydraulic control precision, and ensuring the accuracy of the test results.

[0054] The heat exchanger 304 is connected to a refrigeration unit, which includes:

[0055] The water cooler 311 is provided with a water inlet pipe 312 and a drain pipe 313.

[0056] The water inlet pipe 312 is connected to the water inlet of the heat exchanger 304 after passing through the water cooler 311. A flow meter 314, a thermometer 315, a first air-controlled ball valve 316, and a throttle valve 317 are sequentially provided on the side of the water inlet pipe 312 away from the heat exchanger 304 along the water flow direction.

[0057] The drain pipe 313 is connected to the water outlet of the heat exchanger 304 after passing through the water cooler 311 . A second air-controlled ball valve 318 is provided on a side of the drain pipe 313 close to the heat exchanger 304 .

[0058] In this embodiment, the return oil after the test is circulated and cooled by the chiller system, thereby improving the cooling efficiency and the accuracy of the test results.

[0059] See attached Figure 2As shown, the fuel tank is equipped with an air filter 9 and a liquid level and temperature sensor 10. In this embodiment, the air filter 9 effectively removes or reduces solid particles, microorganisms, or other harmful substances in the air within the fuel tank, ensuring the cleanliness of the test oil. The liquid level and temperature sensor monitors the temperature of the test oil entering the oil inlet pipe and provides feedback to the oil temperature controller, which allows the controller to further adjust the test oil temperature to meet test requirements.

[0060] The tank air filter can filter the air sucked into the tank and purify the oil in the tank. It filters the newly injected working oil and then filters it before it enters the tank, thus filtering out the dirt particles in the oil.

[0061] See attached Figure 2 As shown, a liquid level gauge 11 is installed on the side of the fuel tank, and an oil drain pipe 12 is connected to the lower end of the fuel tank. The liquid level gauge 11 and the oil drain pipe 12 are located on the same side, and a second manual ball valve 13 is installed on the oil drain pipe 12. In this embodiment, the liquid level gauge 11 is a directly visible liquid level gauge 11 for easy observation. The placement of the liquid level gauge 11 and the oil drain pipe 12 on the same side facilitates the observation of the liquid level while operating the manual ball valve to drain the oil, which is very convenient. Alternatively, a pair of liquid level gauges 11 and oil drain pipes 12 can be installed on both sides of the fuel tank for easy observation from both sides, which is convenient and practical.

[0062] Working principle: When the first test oil circuit 5 enters the upper chamber of the oil cylinder 4, the upper chamber is under positive pressure, the piston rod extends downward to press the shock absorber body 8, the force sensor senses, and the pre-test is completed; when the second test oil circuit 6 enters the upper chamber of the oil cylinder 4 through the servo valve, the piston rod extends, and the oil in the lower chamber flows back through the third test oil circuit 7; when the second test oil circuit 6 enters the lower chamber of the oil cylinder 4 through the servo valve, the piston rod retracts, and the oil in the upper chamber flows back through the third test oil circuit 7.

[0063] The shock absorber hydraulic servo test system designed by this utility model realizes high-precision oil supply by combining the circuit of the oil supply system with the servo valve of the test system, thus achieving high-precision control of the displacement of the oil cylinder and high-precision control of the speed, and realizing high-frequency execution of the test task by the oil cylinder; the oil supply system has its own circulation filtration and cooling system, which ensures the cleanliness and constant temperature of the test oil circuit and the accuracy of the test results; the operation is simple and the observation is convenient.

[0064] The above implementation methods are only for illustrating the technical concept and features of the utility model. Its purpose is to enable people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the scope of protection of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the scope of protection of the utility model.

Claims

1. A shock absorber hydraulic servo test system, characterized in that: include: An oil supply system, the oil supply system comprising an oil tank and a first oil supply unit (1), a second oil supply unit (2), and a third oil supply unit (3) connected to the oil tank; A test system, comprising an oil cylinder (4) and a first test oil circuit (5), a second test oil circuit (6) and a third test oil circuit (7) connected to the oil cylinder (4), wherein the first test oil circuit (5) is a pilot oil circuit and is connected to the first oil supply unit (1), the second test oil circuit (6) is a power oil circuit and is connected to the second oil supply unit (2), and the third test oil circuit (7) is a return oil circuit and is connected to the third oil supply unit (3). The second test oil circuit (6) and the third test oil circuit (7) are connected to the oil cylinder (4) through the same servo valve and drive the cylinder to perform telescopic movement; A shock absorber body (8), wherein the shock absorber body (8) is located at the output end of the oil cylinder (4).

2. A shock absorber hydraulic servo test system according to claim 1, characterized in that: The first oil supply unit (1) comprises a first oil inlet pipe (101), on which a first pump body (102), a first one-way valve (103), a pressure reducing valve (104) and a first filter (105) are sequentially arranged along the length direction thereof; a first pressure control unit and a first return pipe (106) connected to the oil tank are arranged on the first oil inlet pipe (101) between the first pump body (102) and the first one-way valve (103), and a first overflow valve (107) is arranged on the first return pipe (106); the first pressure control unit comprises a first pressure switch (108) and a first pressure gauge (109).

3. A shock absorber hydraulic servo test system according to claim 2, characterized in that: A first accumulator (110) is provided on the first oil inlet pipe (101) between the first one-way valve (103) and the pressure reducing valve (104).

4. The shock absorber hydraulic servo test system according to claim 1, characterized in that: The second oil supply unit (2) comprises a second oil inlet pipe (201), on which a second pump body (202), a second one-way valve (203), a second filter (204) and a first manual ball valve (205) are sequentially arranged along the length direction of the second oil inlet pipe (201); A second pressure control unit, a second return pipe (206) and an auxiliary return pipe (207) connected to the oil tank are provided on the second oil inlet pipe (201) between the second one-way valve (203) and the second filter (204); a proportional relief valve (208) is provided on the second return pipe (206), and a second relief valve (209) is provided on the auxiliary return pipe (207); the second pressure control unit comprises a second pressure gauge (210) and a second pressure switch (211) which are sequentially connected to the second oil inlet pipe (201) along the oil supply direction.

5. The shock absorber hydraulic servo test system according to claim 4, characterized in that: The second pressure switch (211) is connected to the second accumulator (212).

6. The shock absorber hydraulic servo test system according to claim 1, characterized in that: The third oil supply unit (3) comprises a third oil inlet pipe (301), on which a third pump body (302), a third one-way valve (303), a heat exchanger (304) and a fourth one-way valve (305) are sequentially arranged along the length direction thereof; a third pressure switch (306) and a third return pipe (307) connected to the oil tank are arranged on the third oil inlet pipe (301) between the third pump body (302) and the third one-way valve (303), and a third overflow valve (308) is arranged on the third return pipe (307).

7. The shock absorber hydraulic servo test system according to claim 6, characterized in that: A fourth return pipe (309) communicating with the oil tank is provided on the third oil inlet pipe (301) between the heat exchanger (304) and the fourth one-way valve (305), and a third filter (310) is provided on the fourth return pipe (309).

8. The shock absorber hydraulic servo test system according to claim 6, characterized in that: The heat exchanger (304) is connected to a refrigeration unit, and the refrigeration unit includes: A water cooler (311), wherein the water cooler (311) is provided with a water inlet pipe (312) and a drain pipe (313), The water inlet pipe (312) is connected to the water inlet of the heat exchanger (304) after passing through the water cooler (311); a flow meter (314), a thermometer (315), a first air-controlled ball valve (316), and a throttle valve (317) are sequentially provided on the side of the water inlet pipe (312) away from the heat exchanger (304) along the water flow direction; The drain pipe (313) is connected to the water outlet of the heat exchanger (304) after passing through the water cooler (311). A second air-controlled ball valve (318) is provided on a side of the drain pipe (313) close to the heat exchanger (304).

9. The shock absorber hydraulic servo test system according to claim 1, characterized in that: The oil tank is provided with an air filter (9) and a liquid level and temperature sensor (10).

10. The shock absorber hydraulic servo test system according to claim 1, characterized in that: A liquid level gauge (11) is provided on the side of the oil tank, and an oil drain pipe (12) is connected to the lower end of the oil tank. The liquid level gauge (11) and the oil drain pipe (12) are provided on the same side, and a second manual ball valve (13) is provided on the oil drain pipe (12).

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