Hydraulic motor test system with multiple loading modes

Abstract

The invention belongs to the technical field of hydraulic motor testing, and particularly relates to a hydraulic motor testing system with multiple loading modes, which comprises a power system, a testing control unit, a testing rack and a measurement and control system, the power system is used for providing a power source for the whole system; the test control unit is used for receiving a control signal of the measurement and control system and driving the execution unit to work; the test bench comprises a test motor, a torque meter and a loading motor; the measurement and control system comprises a power cabinet and a control cabinet and is used for completing electrical control and testing of the system. The test system can perform a hydraulic motor endurance test; testing displacement, leakage and torque; performing a lateral load test; and test contents such as a backpressure loading test and the like meet various requirements of hydraulic motor tests.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic motor testing, and in particular relates to a hydraulic motor testing system with multiple loading modes. Background Art

[0002] Hydraulic motors are hydraulic actuators that perform rotational motion and convert hydraulic energy into mechanical energy. They are widely used in engineering machinery, construction machinery, ships, hoists, coal mining machinery, mining machinery, metallurgical machinery, marine machinery, petrochemicals, port machinery, etc.

[0003] With the rapid development of infrastructure construction and real estate construction in my country, the demand for construction machinery is increasing. As the actuator in construction machinery, hydraulic motors have the characteristics of compact structure, light weight and batch production. In order to meet the above characteristics of hydraulic motors and better ensure the performance of hydraulic motors, it is necessary to test the various performances of hydraulic motors. Summary of the invention

[0004] The present invention provides a hydraulic motor test system with multiple loading modes. The system mainly realizes various performance tests of hydraulic motors, and can perform hydraulic motor durability tests; displacement, leakage, torque tests; lateral load tests; back pressure loading tests and other test contents, meeting various requirements of hydraulic motor tests.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] Hydraulic motor test system with various loading modes, including power system, test control unit, test bench and measurement and control system;

[0007] The power system includes an oil tank device and a pump unit, which are used to provide a power source for the entire system; the pump unit includes a variable plunger pump and a fixed vane pump;

[0008] The test control unit is used to receive the control signal of the measurement and control system and drive the execution unit to work; it includes a proportional speed regulating valve, a relief valve, a rectifier assembly and a proportional relief valve;

[0009] The proportional speed regulating valve is used to adjust the hydraulic oil volume of the test motor;

[0010] The relief valve is used to set the outlet back pressure of the test motor;

[0011] The rectifier assembly consists of four one-way valves to realize the loading of the hydraulic oil circuit when the loading motor is rotating forward or reverse;

[0012] The proportional relief valve is used to adjust the pressure of the hydraulic oil circuit of the loading motor;

[0013] The test bench comprises a test motor, a torque meter and a loading motor; the test motor, the torque meter and the loading motor are connected by a transmission shaft; the loading motor is used for loading the motor endurance test; the torque meter transmits the measured data to the measurement and control system in real time;

[0014] The measurement and control system includes a power cabinet and a control cabinet, which are used to complete the electrical control and testing of the system.

[0015] Furthermore, the power system further comprises:

[0016] Proportional relief valves, two, used to adjust the side load force output by the hydraulic cylinder and adjust the system pressure supplied to the test motor;

[0017] The pressure sensor transmits the actual pressure signal of the system pipeline to the measurement and control system in real time.

[0018] Furthermore, the test control unit further includes:

[0019] There are two flow meters, one for measuring the flow of hydraulic oil entering the test motor and transmitting the flow signal to the measurement and control system in real time; the other for measuring the flow of hydraulic oil leaking from the test motor and transmitting the flow signal to the measurement and control system in real time.

[0020] Furthermore, the test bench also includes:

[0021] The magnetic powder brake is connected to the drive shaft through a synchronous belt to provide loading force for the test motor.

[0022] The beneficial effects of the present invention are:

[0023] (1) The test system of the present invention is provided with a plurality of loading modes, which can be tested individually or in combination, thus meeting various requirements of hydraulic motor testing;

[0024] (2) The test system of the present invention is designed with a flow calibration oil circuit, which can realize the self-calibration of the set flow of the test system;

[0025] (3) The test system of the present invention is designed with a closed loading oil circuit. When the test motor is subjected to a durability test, no additional loading force needs to be provided. Only the hydraulic oil required by the loading oil circuit needs to be replenished. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the test system of the present invention;

[0027] Figure 2 for Figure 1 An enlarged schematic diagram of the rectifier assembly;

[0028] Figure 3The self-calibration schematic diagram for testing the motor given flow;

[0029] Figure 4 Schematic diagram of endurance test for loading motor;

[0030] Figure 5 Schematic diagram of the reverse rotation test for loading the loading motor;

[0031] Figure 6 This is the principle diagram of the displacement, leakage and torque test when the magnetic powder brake is loaded;

[0032] Figure 7 This is the principle diagram of the back pressure test when the magnetic powder brake is loaded;

[0033] In the figure,

[0034] 1. Power system; 100. Fuel tank device; 101. Air filter; 110. Motor pump group 1; 111. Motor pump group 2; 112. Motor pump group 3; 113. One-way valve 1; 114. One-way valve 2; 115. One-way valve 3; 116. High-pressure oil filter 1; 117. High-pressure oil filter 2; 118. High-pressure oil filter 3; 119. Return oil filter; 120. Proportional relief valve 1; 121. Proportional relief valve 2; 122. Solenoid relief valve; 123. Pressure sensor 1; 124. Pressure sensor 2; 2. Test control unit; 201. Proportional speed regulating valve; 202. Flow meter 1; 203. Flow meter 2; 204. Relief valve 1; 205. Electro-hydraulic reversing valve 1; 206. Electro-hydraulic reversing valve 2; 207. Solenoid reversing valve; 208. Accumulator; 209. Pressure sensor three; 210, pressure sensor four; 211, pressure sensor five; 212, pressure sensor six; 213, pressure sensor seven; 214, overflow valve two; 215, cooler; 216, rectifier assembly; 216.1, one-way valve four; 216.2, one-way valve five; 216.3, one-way valve six; 216.4, one-way valve seven; 217, proportional overflow valve three; 218, electromagnetic ball valve; 219, one-way valve eight; 220, electro-hydraulic reversing valve three; 3, test bench; 301, test motor; 302, hydraulic cylinder; 303, force sensor; 304, torque meter; 305, loading motor; 306, magnetic powder brake; 307, synchronous belt; 308, transmission shaft; 309, electromagnetic clutch; 4, measurement and control system; 400, power cabinet; 401, control cabinet. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0036] Embodiment: A hydraulic motor test system with multiple loading modes is mainly used for performance testing of hydraulic motors, including a power system 1, a test control unit 2, a test bench 3 and a measurement and control system 4; the principle of the test system is as follows Figure 1 shown.

[0037] Depend on Figure 1 It can be seen that the power system 1 of the present invention mainly includes an oil tank device 100, a motor pump group 1 110, a motor pump group 2 111, a motor pump group 3 112, a one-way valve 1 113, a one-way valve 2 114, a one-way valve 3 115, a high-pressure oil filter 1 116, a high-pressure oil filter 2 117, a high-pressure oil filter 3 118, a return oil filter 119, a proportional relief valve 1 120, a proportional relief valve 2 121, an electromagnetic relief valve 122, a pressure sensor 1 123, and a pressure sensor 2 124;

[0038] Among them, the oil tank device 100 mainly stores oil, dissipates heat, precipitates impurities in the oil and escapes air mixed in the oil. It is equipped with an air filter 101 to effectively maintain the air pressure in the oil tank and prevent impurities from entering the oil tank; the motor pump group 1 110 adopts a variable piston pump to provide a power source for the hydraulic cylinder 302; the motor pump group 2 111 adopts a variable piston pump to provide a power source for the test motor 301; the motor pump group 3 112 adopts a quantitative vane pump to replenish the hydraulic oil for the loading oil circuit of the loading motor 305 and take away the heat generated by the loading oil circuit. The one-way valve 1 113, the one-way valve 2 114 and the one-way valve 3 115 only allow the hydraulic oil to flow from the pump into the system, but do not allow the hydraulic oil of the system to flow back to the pump to prevent reversal. The high-pressure oil filter 1 116, the high-pressure oil filter 2 117 and the high-pressure oil filter 3 118 can effectively prevent impurities from entering the system and ensure the normal operation of the system.

[0039] The return oil filter 119 filters the return hydraulic oil in the hydraulic system to prevent impurities from entering the hydraulic oil tank. The proportional relief valve 1 120 can set the pressure of the proportional relief valve 1 120 by adjusting the proportional solenoid BDT1 signal, thereby adjusting the lateral load force output by the hydraulic cylinder 302; the proportional relief valve 2 121 can set the pressure of the proportional relief valve 2 121 by adjusting the proportional solenoid BDT2 signal, thereby adjusting the system pressure provided to the test motor 301; the pressure sensor 1 123 and the pressure sensor 2 124 transmit the actual pressure signal of the system pipeline to the measurement and control system 4 in real time. The electromagnetic relief valve 122 sets the pressure of the hydraulic oil to 10 bar, the electromagnetic DT1 of the electromagnetic relief valve 122 is energized, and the hydraulic oil output by the motor pump group 3 112 enters the loading oil circuit.

[0040] refer to Figure 1As shown, the test control unit 2 mainly includes a proportional speed control valve 201, a flow meter 1 202, a flow meter 2 203, an overflow valve 1 204, an electro-hydraulic reversing valve 1 205, an electro-hydraulic reversing valve 2 206, an electromagnetic reversing valve 207, an accumulator 208, a pressure sensor 3 209, a pressure sensor 4 210, a pressure sensor 5 211, a pressure sensor 6 212, a pressure sensor 7 213, an overflow valve 2 214, a cooler 215, a rectifier assembly 216, a proportional overflow valve 3 217, an electromagnetic ball valve 218, a check valve 8 219, and an electro-hydraulic reversing valve 3 220.

[0041] Among them, by adjusting the proportional solenoid BDT3 signal, the flow of hydraulic oil entering the test motor 301 through the proportional speed regulating valve 201 can be adjusted, thereby controlling the speed of the test motor 301. Flowmeter 1 202 can measure the flow of hydraulic oil entering the test motor 301, and transmit the flow signal to the measurement and control system 4 in real time; flowmeter 2 203 can measure the flow of hydraulic oil leaking from the test motor 301, and transmit the flow signal to the measurement and control system 4 in real time. Overflow valve 1 204 can set the outlet back pressure of the test motor 301. Electro-hydraulic reversing valve 1 205, electro-hydraulic reversing valve 2 206, electromagnetic reversing valve 207, and electro-hydraulic reversing valve 3 220 can control the on and off of the hydraulic oil circuit. Accumulator 208 stores hydraulic oil. Pressure sensor 3 209, pressure sensor 4 210, pressure sensor 5 211, pressure sensor 6 212, and pressure sensor 7 213 transmit the actual pressure signal of the system pipeline to the measurement and control system 4 in real time. Overflow valve 214 can set the safety pressure of the loading oil circuit to prevent damage caused by accidental impact. Cooling water is passed through cooler 215 to exchange heat with the hydraulic oil of the hydraulic system, taking away heat and maintaining the loading system working at a suitable temperature. Rectification assembly 216 is composed of four one-way valves (one-way valve 4 216.1, one-way valve 5 216.2, one-way valve 6 216.3, one-way valve 7 216.4) (refer to Figure 2 The proportional relief valve 3 217 can set the pressure of the proportional relief valve 3 217 by adjusting the proportional solenoid BDT4 signal, thereby adjusting the pressure of the loading hydraulic oil circuit of the loading motor 305. The one-way valve 8 219 only allows hydraulic oil to enter the loading oil circuit.

[0042] refer to Figure 1 As shown, the test bench 3 includes a test motor 301 , a hydraulic cylinder 302 , a force sensor 303 , a torque meter 304 , a loading motor 305 , a magnetic powder brake 306 , a synchronous belt 307 , a transmission shaft 308 and an electromagnetic clutch 309 .

[0043] Among them, a force sensor 303 is installed at the piston rod end of the hydraulic cylinder 302. When the rodless cavity of the hydraulic cylinder 302 is filled with oil, the piston rod extends, and the force sensor 303 acts on the transmission shaft 308 of the test bench 3, applying a lateral load to the test motor 301. The force sensor 303 transmits the lateral load force to the measurement and control system 4 in real time. The torque meter 304 can measure torque and speed, and transmit relevant data to the measurement and control system 4 in real time. The loading motor 305 adopts a proportional variable motor. By adjusting the given proportional electromagnet BDT5 signal, the displacement of the loading motor 305 is set to be 10% larger than the displacement of the test motor 301, so as to achieve loading. The loading motor 305 is mainly used to load the endurance test of the test motor 301. The magnetic powder brake 306 is connected to the transmission shaft 308 through a synchronous belt 307. When the magnetic powder brake 306 needs to be loaded, the loading motor 305 is disengaged from the transmission shaft 308, and the electromagnetic clutch 309 is energized. At this time, the magnetic powder brake 306 can load the test motor 301. Different loading forces can be achieved by giving different control signals to the magnetic powder brake.

[0044] The measurement and control system 4 is mainly composed of a power cabinet 400 and a control cabinet 401, which completes the electrical control and testing of the measurement and control system. The analog signals such as the pressure sensor, force sensor, flow meter, proportional valve control signal and the switch signal of the solenoid valve are all processed by the measurement and control system 4. Specifically, the power cabinet 400 is used to control the start and stop of the power components, and the control cabinet 401 is used to receive signals from the pressure sensor, force sensor, etc., and send control signals according to the test requirements.

[0045] The working principle of the hydraulic motor test system of the present invention is:

[0046] The motor pump group three 112 starts, the solenoid DT1 of the electromagnetic overflow valve 122 is energized, and the pressure oil output by the motor pump group three 112 enters the loading oil circuit through the one-way valve eight 219 and the cooler 215, so that the loading oil circuit is filled with hydraulic oil; the motor pump group one 110 and the motor pump group two 111 start. The solenoid DT9 of the electro-hydraulic reversing valve three 220 is energized, the proportional solenoid BDT2 of the proportional overflow valve two 121 is given a pressure signal, and the proportional solenoid BDT3 of the proportional speed control valve 201 is given a flow signal. At this time, the hydraulic oil output by the motor pump group two 111 passes through the one-way valve two 114, the high-pressure oil filter two 117, the proportional speed control valve 201, the flow meter one 202, the electro-hydraulic reversing valve three 220, and the return oil filter 119 and returns to the oil tank device 100. At this time, the flow rate fed back by the flow meter one 202 can calibrate the given signal of the proportional speed control valve 201, so as to realize the self-calibration of the given flow of the test motor 301. The principle is as follows Figure 3 shown.

[0047] After the power system has the test conditions, the working principle is described in detail below in combination with the test items and loading methods:

[0048] When the loading motor 305 is loaded and the endurance test is performed, the transmission shaft of the loading motor 305 is connected to the transmission shaft 308 . The electromagnet DT2 of the electro-hydraulic reversing valve 205 is energized, the electromagnet DT7 of the electromagnetic ball valve 218 is energized, the electromagnet DT1 of the electromagnetic overflow valve 122 is energized, the electromagnet DT3 of the electro-hydraulic reversing valve 206 is energized, the proportional electromagnet BDT2 of the proportional overflow valve 121 is given a signal, the proportional electromagnet BDT3 of the proportional speed control valve 201 is given a signal, and the hydraulic oil output by the motor pump group 2 111 passes through the one-way valve 2 114, the high-pressure oil filter 2 117, the proportional speed control valve 201, the flowmeter 1 202, and the electro-hydraulic reversing valve 206 into the oil port 1 of the test motor 301, so that the test motor 301 rotates, and the hydraulic oil flows out from the oil port 2 of the test motor 301, passes through the electro-hydraulic reversing valve 2 206, the electro-hydraulic reversing valve 1 205, and the return oil filter 119 and returns to the oil tank device 100. The rotation of the test motor 301 is transmitted to the loading motor 305 through the transmission shaft 308, thereby driving the loading motor 305 to rotate, and the hydraulic oil flows out from the oil port 2 of the loading motor 305, passes through the one-way valve 4 216.1 of the rectifier assembly 216, the proportional relief valve 3 217, the cooler 215, and the one-way valve 6 216.3 of the rectifier assembly 216, and returns to the oil port 1 of the loading motor 305, thereby forming a closed loading loop. At this time, by adjusting the proportional electromagnet BDT4 signal of the proportional relief valve 3 217, the loading of the test motor 301 can be achieved. By adjusting the given signal of the proportional electromagnet BDT2 of the proportional relief valve 2 121 and the proportional electromagnet BDT4 of the proportional relief valve 3 217, the loading of the test motor 301 under different pressures can be achieved; by adjusting the proportional electromagnet BDT3 signal of the given proportional speed regulating valve 201, the loading of the test motor 301 under different speeds can be achieved. During the loading test, the leaked oil of the test motor 301 returns to the oil tank device 100 through the electromagnetic ball valve 218; the pressure sensor 3 209, the pressure sensor 4 210, the pressure sensor 5 211, and the pressure sensor 6 212 transmit the pressure signal to the measurement and control system 4; the torque meter 304 transmits the torque and speed signals to the control system 4 in real time. The above test principle is as follows Figure 4 shown.

[0049] If a reverse rotation test is required, under the above working state, it is only necessary to energize the electromagnet DT4 of the electro-hydraulic reversing valve 206, and the hydraulic oil output by the motor pump group 2 111 enters the oil port 2 of the test motor 301, and the hydraulic oil flows out from the oil port 1 of the test motor 301; the hydraulic oil of the loading oil circuit flows out from the oil port 1 of the loading motor 305, passes through the one-way valve five 216.2 of the rectifier assembly 216, the proportional relief valve three 217, the cooler 215, and the one-way valve seven 216.4 of the rectifier assembly 216, and returns to the oil port 2 of the loading motor 305. The above test principle is as follows. Figure 5 shown.

[0050] When the magnetic powder brake 306 is loaded and the displacement, leakage and torque tests are performed, the loading motor 305 is disengaged from the transmission shaft 308, and the electromagnetic clutch 309 is energized. At this time, the magnetic powder brake 306 is loaded for the test motor. The electromagnet DT2 of the electro-hydraulic reversing valve 205 is energized, the electromagnet DT1 of the electromagnetic overflow valve 122 is energized, the electromagnet DT3 of the electro-hydraulic reversing valve 206 is energized, the proportional electromagnet BDT2 of the proportional overflow valve 121 is given a signal, the proportional electromagnet BDT3 of the proportional speed control valve 201 is given a signal, and the hydraulic oil output by the motor pump group 2 111 passes through the one-way valve 2 114, the high-pressure oil filter 2 117, the proportional speed control valve 201, the flowmeter 1 202, and the electro-hydraulic reversing valve 206 into the oil port 1 of the test motor 301, so that the test motor 301 rotates, and the hydraulic oil flows out from the oil port 2 of the test motor 301, passes through the electro-hydraulic reversing valve 2 206, the electro-hydraulic reversing valve 1 205, and the return oil filter 119 and returns to the oil tank device 100. The rotation of the test motor 301 is transmitted to the magnetic powder brake 306 through the transmission shaft 308 and the synchronous belt 307. At this time, the measurement and control system 4 gives different control signals to the magnetic powder brake 306, so that different loading forces can be achieved. By adjusting the proportional solenoid BDT3 signal of the given proportional speed control valve 201, the loading of the test motor 301 at different speeds can be achieved. During the loading test, the leakage oil of the test motor 301 returns to the oil tank device 100 through the flow meter 2 203. Flowmeter 1 202 and flowmeter 2 203 transmit the flow signal to the measurement and control system 4 in real time; pressure sensor 3 209, pressure sensor 4 210, pressure sensor 5 211, and pressure sensor 6 212 transmit the pressure signal to the measurement and control system 4 in real time; the torque meter 304 transmits the torque and speed signals to the measurement and control system 4 in real time. The above test principles are as follows: Figure 6 If a reverse rotation test is required, in the above working state, it is only necessary to energize the electromagnet DT4 of the electro-hydraulic reversing valve 206.

[0051] Back pressure loading test, when the test motor 301 needs to be tested for back pressure loading, the electromagnet of the electro-hydraulic reversing valve 1 205 loses power, and the hydraulic oil flowing out of the test motor 301 passes through the electro-hydraulic reversing valve 2 206, the relief valve 1 204, and the return oil filter 119 and returns to the oil tank device 100. At this time, different back pressures can be set by setting the pressure of the relief valve 1 204. This test can be carried out alone or under the condition of magnetic powder brake loading or loading motor loading. Figure 7 This is the principle diagram of the back pressure test when the magnetic powder brake is loaded.

[0052] Lateral load test: When the test motor 301 needs to undergo a lateral load test, the electromagnet DT5 of the electromagnetic reversing valve 207 is energized, and the proportional electromagnet BDT1 of the proportional relief valve 120 is given a signal. The hydraulic oil output by the motor pump group 110 passes through the one-way valve 113, the high-pressure oil filter 116, and the electromagnetic reversing valve 207 and enters the rodless chamber of the hydraulic cylinder 302. The piston rod of the hydraulic cylinder 302 extends, and the power sensor 303 acts on the transmission shaft 308 of the test bench 3 to apply a lateral load to the test motor 301. The force sensor 303 transmits the lateral load force to the measurement and control system 4 in real time. The hydraulic oil in the rod chamber of the hydraulic cylinder 302 passes through the electromagnetic reversing valve 207 and returns to the oil tank device 100. The hydraulic oil output by the motor pump group 110 enters the rodless chamber of the hydraulic cylinder 302 through the one-way valve 113, and also enters the accumulator 208 for storage. When the lateral load force reaches the set value, the electromagnet of the electromagnetic reversing valve 207 loses power, and the pressure oil stored in the accumulator 208 maintains the lateral load force. This test can be carried out alone, or when the magnetic powder brake is loaded or the loading motor is loaded, or when the back pressure loading test is carried out. When the lateral load test is not required, the electromagnet DT6 of the electromagnetic reversing valve 207 is energized, and the proportional electromagnet BDT1 of the proportional relief valve 120 is given a signal. The hydraulic oil output by the motor pump group 110 enters the rod chamber of the hydraulic cylinder 302 through the one-way valve 113, the high-pressure oil filter 116, and the electromagnetic reversing valve 207. The piston rod of the hydraulic cylinder retracts, and after the power sensor 303 is separated from the transmission shaft 308, the electromagnetic reversing valve 207 loses power, and the hydraulic cylinder 302 is locked.

[0053] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydraulic motor test system with multiple loading modes, characterized in that: Including power system, test control unit, test bench and measurement and control system; The power system includes an oil tank device and a pump unit, which are used to provide a power source for the entire system; the pump unit includes a variable plunger pump and a fixed vane pump; The test control unit is used to receive the control signal of the measurement and control system and drive the execution unit to work; It includes a proportional speed regulating valve, a relief valve, a rectifying assembly and a proportional relief valve; The proportional speed regulating valve is used to adjust the hydraulic oil volume of the test motor; The relief valve is used to set the outlet back pressure of the test motor; The rectifier assembly consists of four one-way valves to realize the loading of the hydraulic oil circuit when the loading motor is rotating forward or reverse; The proportional relief valve is used to adjust the pressure of the hydraulic oil circuit of the loading motor; The test bench includes a test motor, a torque meter and a loading motor; The test motor, torque meter and loading motor are connected via a transmission shaft; the loading motor is used for loading the test motor endurance test; the torque meter transmits the measured data to the measurement and control system in real time; The measurement and control system includes a power cabinet and a control cabinet, which are used to complete the electrical control and testing of the system.

2. The hydraulic motor testing system with multiple loading modes according to claim 1, characterized in that: The power system further comprises: Proportional relief valves, two, used to adjust the side load force output by the hydraulic cylinder and adjust the system pressure supplied to the test motor; The pressure sensor transmits the actual pressure signal of the system pipeline to the measurement and control system in real time.

3. The hydraulic motor testing system with multiple loading modes according to claim 1, characterized in that: The test control unit also includes: There are two flow meters, one for measuring the flow of hydraulic oil entering the test motor and transmitting the flow signal to the measurement and control system in real time; the other for measuring the flow of hydraulic oil leaking from the test motor and transmitting the flow signal to the measurement and control system in real time.

4. The hydraulic motor testing system with multiple loading modes according to claim 1, characterized in that: The test bench also includes: The magnetic powder brake is connected to the drive shaft through a synchronous belt to provide loading force for the test motor.

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