Impact test system for hydrostatic unit

Abstract

The invention discloses a hydrostatic unit impact test system, which relates to the technical field of hydraulic impact test, and comprises a power input part, a loading assembly, an oil supplementing assembly and a cooling loop, the power input part is connected with the input end of the hydrostatic unit and used for providing power needed by the hydrostatic unit. The loading assembly is connected with the output end of the hydrostatic unit, and the loading assembly can provide different loads through flowing of hydraulic oil; the oil supplementing assembly is connected with the loading assembly and the static hydraulic unit, and the oil supplementing assembly is used for supplementing hydraulic oil into the loading assembly and the static hydraulic unit; the cooling loop is connected with the loading assembly and can form a hydraulic oil loop with the loading assembly, and the cooling loop can cool hydraulic oil in the loading assembly. According to the hydrostatic unit impact test system provided by the invention, rapid impact test on the hydrostatic unit is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic shock testing, and in particular to a static hydraulic unit shock testing system. Background Art

[0002] The hydrostatic unit is mainly composed of a hydraulic pump, a hydraulic motor and various accessories. Compared with the hydrostatic transmission system, the hydrostatic transmission unit has the advantages of small size, light weight, high precision and fast response. However, the hydrostatic unit cannot avoid the harm caused by hydraulic shock. Therefore, it is necessary to perform an impact test on the hydrostatic unit. However, the lack of an impact test system for the hydrostatic unit makes it difficult to conduct convenient and fast hydrostatic unit testing. Summary of the invention

[0003] The object of the present invention is to provide a hydrostatic unit impact test system to solve the above-mentioned problems in the prior art and facilitate rapid impact testing of the hydrostatic unit.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a hydrostatic unit impact test system, comprising a power input component, a loading component, an oil replenishing component and a cooling circuit; the power input component is connected to the input end of the hydrostatic unit and is used to provide the power required by the hydrostatic unit; the loading component is connected to the output end of the hydrostatic unit, and the loading component can provide different loads through the flow of hydraulic oil; the oil replenishing component is connected to both the loading component and the hydrostatic unit, and the oil replenishing component is used to replenish hydraulic oil into the loading component and the hydrostatic unit; the cooling circuit is connected to the loading component and can form a hydraulic oil circuit with the loading component, and the cooling circuit can cool the hydraulic oil in the loading component.

[0006] Preferably, the loading assembly includes a bidirectional motor and a circuit valve, the bidirectional motor is connected to the output end of the hydrostatic unit, and a first torque speed sensor is arranged between the bidirectional motor and the hydrostatic unit, the two working oil ports of the bidirectional motor are both connected to the circuit valve, and the bidirectional motor can drive the hydraulic oil to flow in the circuit valve; the oil replenishing assembly and the cooling circuit are both connected to the circuit valve, the oil replenishing assembly can replenish the hydraulic oil into the circuit valve, and the cooling circuit can cool the hydraulic oil in the circuit valve.

[0007] Preferably, the circuit valve includes a first ball valve, a first relief valve, a first throttle valve, a second throttle valve, a first check valve, a first plug-in, a second plug-in, a third plug-in, a fourth plug-in, a fifth plug-in, a sixth plug-in and a seventh plug-in; the B port of the first ball valve is connected to the P port of the first relief valve, the X port and the A port of the first plug-in, the X port and the A port of the second plug-in, and the B port and the X port of the third plug-in; the P port of the first ball valve is connected to the oil inlet of the cooling circuit, the T port of the first relief valve and the B port of the first plug-in; and the first throttle valve and the second throttle valve are respectively arranged on the connecting pipeline between the B port of the first ball valve and the X port and the A port of the first plug-in; the A port of the second plug-in is connected to the oil inlet of the cooling circuit, the T port of the first relief valve and the B port of the first plug-in The B port and X port of the second plug-in are connected with the B port of the first ball valve, the P port of the first relief valve, the X port and A port of the first plug-in, the B port and X port of the third plug-in and the X port of the second plug-in; the A port of the third plug-in is connected with the B port and X port of the fifth plug-in and another working oil port of the bidirectional motor; the A port of the fourth plug-in is connected with the A port of the fifth plug-in, the B port and X port of the sixth plug-in and the B port and X port of the seventh plug-in; the A port of the sixth plug-in is connected with the oil outlet of the oil replenishing assembly; the A port of the seventh plug-in is connected with the oil outlet of the cooling circuit, and is connected with the oil tank through the first one-way valve.

[0008] Preferably, the port A of the second plug-in component and the port A of the third plug-in component are respectively connected to a pressure monitoring component.

[0009] Preferably, the oil discharge port of the bidirectional motor is connected to a first filter and a second one-way valve in sequence, and the second one-way valve is connected to an oil tank.

[0010] Preferably, the oil replenishment assembly includes a driving component, an oil replenishment valve, a second filter and a third one-way valve, the oil inlet end of the driving component is connected to the oil tank, the oil outlet end of the driving component is connected to the oil inlet of the oil replenishment valve through the third one-way valve and the second filter in sequence, and the two oil outlets of the oil replenishment valve are connected to the loading component and the hydrostatic unit respectively; the driving component can drive the hydraulic oil to enter the loading component and the hydrostatic unit through the oil replenishment valve.

[0011] Preferably, the oil replenishing valve includes a second overflow valve, a first pressure reducing valve, a second pressure reducing valve, a first reversing valve and a second reversing valve; the A port, P port and T port of the first reversing valve are respectively connected to the static hydraulic unit, the P2 port of the first pressure reducing valve and the oil tank; the A port, P port and T port of the second reversing valve are respectively connected to the loading assembly, the P2 port of the second pressure reducing valve and the oil tank; the P1 port of the first pressure reducing valve and the P1 port of the second pressure reducing valve are both connected to the driving component through the second filter; the T port of the first pressure reducing valve and the T port of the second pressure reducing valve are both connected to the T port of the second overflow valve and the oil tank; the P port of the second overflow valve is also connected to the P1 port of the first pressure reducing valve and the P1 port of the second pressure reducing valve.

[0012] Preferably, the cooling circuit comprises a third filter, a pressure difference relay, a first flow meter and a cooler which are connected in sequence; the third filter is connected to the oil outlet of the loading assembly, and the cooler is connected to the oil return port of the loading assembly.

[0013] Preferably, a second torque speed sensor is provided between the power input member and the hydrostatic unit.

[0014] Preferably, the oil return port of the static hydraulic unit is connected to a fourth filter, a second flow meter and a fourth one-way valve in sequence, and the oil outlet of the fourth one-way valve is connected to the oil tank.

[0015] Compared with the prior art, the present invention has achieved the following technical effects:

[0016] The hydrostatic unit impact test system provided by the present invention provides the required power for the hydrostatic unit through a power input piece, and a loading component can provide a load for the hydrostatic unit to simulate the installed operating state of the hydrostatic unit, and adjust the hydraulic oil of the loading component and the hydrostatic unit through an oil replenishing component to adjust the pressure, and by adjusting the input power of the power input piece and the state of the actuator of the hydrostatic unit itself, it is convenient to accurately simulate the impact of the hydrostatic unit under different working conditions, and there is no need to load the hydrostatic unit onto a vehicle for whole vehicle testing, which shortens the test time, reduces the test cost, and is conducive to improving the accuracy of the impact of the impact on the performance of the hydrostatic unit; in addition, the cooling circuit connected to the loading component can cool the hydraulic oil in the load circuit to meet the simulation requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of a hydrostatic unit impact test system provided in Example 1;

[0019] Figure 2 A schematic diagram of the flow direction from port A1 to port B1 of the loop valve provided in Example 1;

[0020] Figure 3 This is a schematic diagram of the flow direction from port B1 to port A1 of the loop valve provided in Example 1.

[0021] In the figure:

[0022] 1-Power input part;

[0023] 2-static hydraulic unit; 201-fourth filter; 202-second flow meter; 203-fourth one-way valve;

[0024] 3-loading assembly; 301-bidirectional motor; 302-circuit valve; 303-first torque speed sensor; 304-first ball valve; 305-first overflow valve; 306-first throttle valve; 307-first throttle valve; 308-first check valve; 309-first plug-in; 310-second plug-in; 311-third plug-in; 312-fourth plug-in; 313-fifth plug-in; 314-sixth plug-in; 315-seventh plug-in; 318-pressure sensor; 319-pressure gauge;

[0025] 4- oil replenishment assembly; 401- driving component; 402- oil replenishment valve; 403- second filter; 404- third one-way valve; 405- second overflow valve; 406- first pressure reducing valve; 407- second pressure reducing valve; 408- first reversing valve; 409- second reversing valve;

[0026] 5-cooling circuit; 501-third filter; 502-pressure difference relay; 503-first flow meter; 504-cooler; 505-two-position two-way valve; 506-ball valve;

[0027] 6- oil tank; 7- second torque speed sensor. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The object of the present invention is to provide a hydrostatic unit impact test system to solve the above-mentioned problems in the prior art and facilitate rapid impact testing of the hydrostatic unit.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Embodiment 1

[0032] This embodiment provides a hydrostatic unit impact test system, see Figure 1 , including a power input component 1, a loading component 3, an oil replenishing component 4 and a cooling circuit 5; the power input component 1 is connected to the input end of the hydrostatic unit 2 and is used to provide the power required by the hydrostatic unit 2; the loading component 3 is connected to the output end of the hydrostatic unit 2, and the loading component 3 can provide different loads through the flow of hydraulic oil; the oil replenishing component 4 is connected to both the loading component 3 and the hydrostatic unit 2, and the oil replenishing component 4 is used to replenish hydraulic oil into the loading component 3 and the hydrostatic unit 2; the cooling circuit 5 is connected to the loading component 3 and can form a hydraulic oil circuit with the loading component 3, and the cooling circuit 5 can cool the hydraulic oil in the loading component 3.

[0033] The required power for the hydrostatic unit 2 is provided through the power input component 1, and the loading component 3 can provide a load for the hydrostatic unit 2 to simulate the installed operating state of the hydrostatic unit 2. The hydraulic oil of the loading component 3 and the hydrostatic unit 2 can be adjusted through the oil replenishment component 4 to adjust the pressure. By adjusting the input power of the power input component 1 and the state of the actuator of the hydrostatic unit 2 itself, such as the swing angle range, it is convenient to accurately simulate the impact of the hydrostatic unit 2 under different working conditions. There is no need to load the hydrostatic unit 2 on a vehicle for vehicle testing, which shortens the test time, reduces the test cost, and is conducive to improving the accuracy of the impact of the impact on the performance of the hydrostatic unit 2. In addition, the cooling circuit 5 connected to the loading component 3 can cool the hydraulic oil in the load circuit to meet the simulation requirements.

[0034] In the optional scheme of this embodiment, it is more preferred that the loading component 3 includes a bidirectional motor 301 and a circuit valve 302, the bidirectional motor 301 is connected to the output end of the hydrostatic unit 2, and a first torque speed sensor 303 is arranged between the bidirectional motor 301 and the hydrostatic unit 2, the two working oil ports and the A1 port and the B1 port of the bidirectional motor 301 are all connected to the circuit valve 302, the bidirectional motor 301 can drive the hydraulic oil to flow in both directions in the circuit valve 302 to realize the simulation of the working condition; the oil replenishing component 4 and the cooling circuit 5 are both connected to the circuit valve 302, the oil replenishing component 4 can replenish the hydraulic oil into the circuit valve 302 to adjust the working pressure, and the cooling circuit 5 can cool the hydraulic oil in the circuit valve 302.

[0035] The bidirectional motor 301 is a bidirectional fixed displacement plunger hydraulic motor, and its displacement is greater than or equal to the displacement of the motor unit in the hydrostatic unit 2; by setting the first torque speed sensor 303, the output parameters of the hydrostatic unit 2 can be monitored for adjustment.

[0036] In the optional scheme of this embodiment, it is more preferred that the circuit valve 302 includes a first ball valve 304, a first overflow valve 305, a first throttle valve 306, a second throttle valve 307, a first check valve 308, a first plug-in component 309, a second plug-in component 310, a third plug-in component 311, a fourth plug-in component 312, a fifth plug-in component 313, a sixth plug-in component 314 and a seventh plug-in component 315, which can adapt to the flow direction of the hydraulic oil in the closed circuit, so that the bidirectional motor 301 can achieve consistent closed circuit flow direction under any steering direction; wherein the first overflow valve 309, the first throttle valve 306 and the second throttle valve 307 can adjust the flow rate.

[0037] Specifically, the B port of the first ball valve 304 is connected to the P port of the first relief valve 305, the X port and the A port of the first plug-in 309, the X port and the A port of the second plug-in 310, and the B port and the X port of the third plug-in 311; the P port of the first ball valve 304 is connected to the oil inlet of the cooling circuit 5, the T port of the first relief valve 305, and the B port of the first plug-in 309, that is, the T oil outlet of the circuit valve 302 is connected to the oil inlet of the cooling circuit 5; and the first ball valve 304 The first throttle valve 306 and the second throttle valve 307 are respectively arranged on the connecting pipelines between the B port of the first plug-in 309 and the X port and the A port of the first plug-in 309; the A port of the second plug-in 310 is connected with the B port and the X port of the fourth plug-in 312 and the A1 port, a working oil port of the bidirectional motor 301, which is equivalent to the A1 port of the circuit valve 302 being connected with the A1 port, a working oil port of the bidirectional motor 301; the B port of the second plug-in 310 is connected with the B port of the first ball valve 304, the first overflow valve 3 The P port of the first plug-in 309, the X port and the A port of the first plug-in 309, the B port and the X port of the third plug-in 311, and the X port of the second plug-in 310 are all connected; the A port of the third plug-in 311 is connected with the B port and the X port of the fifth plug-in 313 and the other working oil port of the bidirectional motor 301, that is, the B1 port, which is equivalent to the B1 port of the circuit valve 302 being connected with the B1 port of the bidirectional motor 301; the A port of the fourth plug-in 312 is connected with the A port of the fifth plug-in 313. The port, the B port and the X port of the sixth plug-in component 314, and the B port and the X port of the seventh plug-in component 315 are all connected; the A port of the sixth plug-in component 314 is connected to the oil outlet of the oil replenishing component 4, which is equivalent to the P oil inlet of the circuit valve 302 being connected to the B oil outlet of the oil replenishing component 4; the A port of the seventh plug-in component 315 is connected to the oil outlet of the cooling circuit 5, and is connected to the oil tank 6 through the first one-way valve 308, which is equivalent to the I oil inlet of the circuit valve 302 being connected to the oil outlet of the cooling circuit 5.

[0038] Specifically, the bidirectional flow direction of the loop valve 302 is as follows:

[0039] like Figure 2 , from A1-B1 to: When the A1 port of the loop valve 302 is input and the B1 port is output, the hydraulic oil flows through the second plug-in component 310, the first plug-in component 309, the third filter 501, the first flow meter 503, the cooler 504, the sixth plug-in component 314, and the fifth plug-in component 313 to the B1 port of the loop valve 302.

[0040] like Figure 3 , from B1-A1 to: when the B1 port of the loop valve 302 is input and the A1 port is output, the hydraulic oil flows through the third plug-in 311, the first plug-in 309, the third filter 501, the first flow meter 503, the cooler 504, the sixth plug-in 314, and the fourth plug-in 312 to the A1 port of the loop valve 302.

[0041] In the optional scheme of this embodiment, it is more preferred that the port A of the second plug-in component 310 and the port A of the third plug-in component 311 are respectively connected to a pressure monitoring component, specifically, the pressure monitoring component is a pressure sensor 318 and a pressure gauge 319, and the pressure information is monitored to adjust the system parameters.

[0042] In the optional scheme of this embodiment, it is more preferred that the oil discharge port of the bidirectional motor 301 is connected to the first filter 316 and the second one-way valve 317 in sequence, and the second one-way valve 317 is connected to the oil tank 6. The first filter 316 is set to filter the hydraulic oil, and the second one-way valve 317 prevents backflow.

[0043] In the optional scheme of this embodiment, it is more preferred that the oil replenishing assembly 4 includes a driving component 401, an oil replenishing valve 402, a second filter 403 and a third non-return valve 404, the oil inlet end of the driving component 401 is connected to the oil tank 6, and the oil outlet end of the driving component 401 is connected to the oil inlet port P of the oil replenishing valve 402 through the third non-return valve 404 and the second filter 403 in turn, and the two oil outlets of the oil replenishing valve 402, namely the port B and the port A, are respectively connected to the loading component 3 and the hydrostatic unit 2; the driving component 401 can drive the hydraulic oil to enter the loading component 3 and the hydrostatic unit 2 through the oil replenishing valve 402; the driving component 401 can simultaneously provide cooled hydraulic oil to the circuits of the hydrostatic unit 2 and the loading component 3 through the oil replenishing valve 402 to maintain the pressure of the two systems; wherein the second filter 403 can filter the hydraulic oil to prevent impurities from affecting the system operation, and the third non-return valve 404 can prevent the hydraulic oil from flowing back.

[0044] The driving component 401 is configured as an oil supply pump and is driven by a motor.

[0045] In the optional scheme of this embodiment, it is more preferred that the oil replenishing valve 402 includes a second overflow valve 405, a first pressure reducing valve 406, a second pressure reducing valve 407, a first reversing valve 408 and a second reversing valve 409; the flow rate can be adjusted by the second overflow valve 405, the first pressure reducing valve 406 and the second pressure reducing valve 407, and the first reversing valve 408 and the second reversing valve 409 can adjust the flow direction of the hydraulic oil.

[0046] Specifically, the A port, P port and T port of the first reversing valve 408 are connected to the static hydraulic unit 2, the P2 port of the first pressure reducing valve 406 and the oil tank 6 respectively; the A port, P port and T port of the second reversing valve 409 are connected to the loading assembly 3, the P2 port of the second pressure reducing valve 407 and the oil tank 6 respectively; the P1 port of the first pressure reducing valve 406 and the P1 port of the second pressure reducing valve 407 are both connected to the driving component 401 through the second filter 403; the T port of the first pressure reducing valve 406 and the T port of the second pressure reducing valve 407 are both connected to the T port of the second overflow valve 405 and the oil tank 6; the P port of the second overflow valve 405 is also connected to the P1 port of the first pressure reducing valve 406 and the P1 port of the second pressure reducing valve 407.

[0047] Among them, the first reversing valve 408 and the second reversing valve 409 are both set as three-position four-way solenoid reversing valves, and the driving component 401 drives the hydraulic oil to enter through the P1 port of the first pressure reducing valve 406, and is discharged to the P port of the first reversing valve 408 through the P2 port of the first pressure reducing valve 406, and flows to the G port of the static hydraulic unit 2 through the A port of the first reversing valve 408; the driving component 401 also drives the hydraulic oil to enter from the P1 port of the second pressure reducing valve 407, and is discharged to the P port of the second reversing valve 409 through the P2 port of the second pressure reducing valve 407, and flows to the P port of the circuit valve 302 through the A port of the second reversing valve 409.

[0048] In the optional scheme of this embodiment, it is more preferred that the cooling circuit 5 includes a third filter 501, a pressure difference relay 502, a first flow meter 503 and a cooler 504 which are connected in sequence; the third filter 501 is connected to the oil outlet, i.e., the T port, of the loading component 3, and the cooler 504 is connected to the oil return port, i.e., the I port, of the loading component 3; wherein the third filter 501 filters the hydraulic oil, the pressure difference relay 502 can perform oil pressure safety protection, the first flow meter 503 monitors the flow in order to adjust the system parameters, and the cooler 504 cools down the hydraulic oil, wherein the cooler 504 is connected to a two-position two-way valve 505 and a ball valve 506, which can adjust the cooling medium in the cooler 504.

[0049] In the optional scheme of this embodiment, more preferably, a second torque speed sensor 7 is provided between the power input member 1 and the hydrostatic unit 2 to monitor the input parameters of the power input member 1 for adjustment, and the power input member 1 is set as a servo motor.

[0050] In the optional scheme of this embodiment, it is more preferred that the return oil port, i.e., port T, of the static hydraulic unit 2 is connected to the fourth filter 201, the second flow meter 202 and the fourth one-way valve 203 in sequence, the oil outlet of the fourth one-way valve 203 is connected to the oil tank 6, the fourth filter 201 filters the hydraulic oil, the second flow meter 202 monitors the flow in order to adjust the system parameters, and the fourth one-way valve 203 prevents backflow.

[0051] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A hydrostatic unit impact test system, characterized in that: include: A power input member (1) connected to an input end of a hydrostatic unit (2) and used to provide power required by the hydrostatic unit (2); A loading component (3) connected to the output end of the static hydraulic unit (2), wherein the loading component (3) can provide different loads through the flow of hydraulic oil; an oil replenishing assembly (4), connected to both the loading assembly (3) and the hydrostatic unit (2), the oil replenishing assembly (4) being used to replenish hydraulic oil into the loading assembly (3) and the hydrostatic unit (2); and A cooling circuit (5) is connected to the loading component (3) and can form a hydraulic oil circuit with the loading component (3); the cooling circuit (5) can cool the hydraulic oil in the loading component (3).

2. The hydrostatic unit impact test system according to claim 1, characterized in that: The loading component (3) comprises a bidirectional motor (301) and a circuit valve (302); the bidirectional motor (301) is connected to the output end of the static hydraulic unit (2); a first torque speed sensor (303) is provided between the bidirectional motor (301) and the static hydraulic unit (2); two working oil ports of the bidirectional motor (301) are both connected to the circuit valve (302); the bidirectional motor (301) can drive hydraulic oil to flow in the circuit valve (302); the oil replenishing component (4) and the cooling circuit (5) are both connected to the circuit valve (302); the oil replenishing component (4) can replenish hydraulic oil into the circuit valve (302); and the cooling circuit (5) can cool the hydraulic oil in the circuit valve (302).

3. The hydrostatic unit impact test system according to claim 2, characterized in that: The circuit valve (302) comprises a first ball valve (304), a first overflow valve (305), a first throttle valve (306), a second throttle valve (307), a first check valve (308), a first plug-in component (309), a second plug-in component (310), a third plug-in component (311), a fourth plug-in component (312), a fifth plug-in component (313), a sixth plug-in component (314) and a seventh plug-in component (315); The B port of the first ball valve (304) is connected to the P port of the first relief valve (305), the X port and the A port of the first plug-in component (309), the X port and the A port of the second plug-in component (310), and the B port and the X port of the third plug-in component (311); the P port of the first ball valve (304) is connected to the oil inlet of the cooling circuit (5), the T port of the first relief valve (305), and the B port of the first plug-in component (309); and the first throttle valve (306) and the second throttle valve (307) are respectively provided on the connecting pipeline between the B port of the first ball valve (304) and the X port and the A port of the first plug-in component (309); The A port of the second plug-in component (310) is in communication with the B port and the X port of the fourth plug-in component (312) and a working oil port of the bidirectional motor (301); the B port of the second plug-in component (310) is in communication with the B port of the first ball valve (304), the P port of the first overflow valve (305), the X port and the A port of the first plug-in component (309), the B port and the X port of the third plug-in component (311) and the X port of the second plug-in component (310); The A port of the third plug-in component (311) is in communication with the B port and the X port of the fifth plug-in component (313) and another working oil port of the bidirectional motor (301); The A port of the fourth plug-in component (312) is in communication with the A port of the fifth plug-in component (313), the B port and the X port of the sixth plug-in component (314), and the B port and the X port of the seventh plug-in component (315); The port A of the sixth plug-in component (314) is in communication with the oil outlet of the oil replenishing assembly (4); The port A of the seventh plug-in component (315) is connected to the oil outlet of the cooling circuit (5), and is connected to the oil tank (6) through the first one-way valve (308).

4. The hydrostatic unit impact test system according to claim 3, characterized in that: The port A of the second plug-in component (310) and the port A of the third plug-in component (311) are respectively connected to a pressure monitoring component.

5. The hydrostatic unit impact test system according to claim 2, characterized in that: The oil discharge port of the bidirectional motor (301) is connected in sequence to a first filter (316) and a second one-way valve (317), and the second one-way valve (317) is connected to an oil tank (6).

6. The hydrostatic unit impact test system according to claim 1, characterized in that: The oil replenishment assembly (4) comprises a driving component (401), an oil replenishment valve (402), a second filter (403) and a third one-way valve (404); the oil inlet end of the driving component (401) is connected to the oil tank (6); the oil outlet end of the driving component (401) is connected to the oil inlet of the oil replenishment valve (402) through the third one-way valve (404) and the second filter (403) in sequence; the two oil outlets of the oil replenishment valve (402) are connected to the loading component (3) and the static hydraulic unit (2) respectively; the driving component (401) is capable of driving the hydraulic oil to enter the loading component (3) and the static hydraulic unit (2) through the oil replenishment valve (402).

7. The hydrostatic unit impact test system according to claim 6, characterized in that: The oil replenishment valve (402) comprises a second overflow valve (405), a first pressure reducing valve (406), a second pressure reducing valve (407), a first reversing valve (408) and a second reversing valve (409); The A port, the P port and the T port of the first reversing valve (408) are respectively connected to the static hydraulic unit (2), the P2 port of the first pressure reducing valve (406) and the oil tank (6); The A port, the P port and the T port of the second reversing valve (409) are respectively connected to the loading assembly (3), the P2 port of the second pressure reducing valve (407) and the oil tank (6); The P1 port of the first pressure reducing valve (406) and the P1 port of the second pressure reducing valve (407) are both connected to the driving component (401) through the second filter (403); the T port of the first pressure reducing valve (406) and the T port of the second pressure reducing valve (407) are both connected to the T port of the second overflow valve (405) and the oil tank (6); The P port of the second relief valve (405) is also connected to the P1 port of the first pressure reducing valve (406) and the P1 port of the second pressure reducing valve (407).

8. The hydrostatic unit impact test system according to claim 1, characterized in that: The cooling circuit (5) comprises a third filter (501), a pressure difference relay (502), a first flow meter (503) and a cooler (504) which are connected in sequence; The third filter (501) is in communication with the oil outlet of the loading assembly (3), and the cooler (504) is in communication with the oil return port of the loading assembly (3).

9. The hydrostatic unit impact test system according to claim 1, characterized in that: A second torque speed sensor (7) is provided between the power input member (1) and the static hydraulic unit (2).

10. The hydrostatic unit impact test system according to claim 1, characterized in that: The oil return port of the static hydraulic unit (2) is connected in sequence to a fourth filter (201), a second flow meter (202) and a fourth one-way valve (203); the oil outlet of the fourth one-way valve (203) is connected to an oil tank (6).

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