CN115199523B - A comprehensive test system for variable characteristics of four-quadrant hydraulic pumps - Google Patents

Abstract

A four-quadrant hydraulic pump variable characteristic comprehensive testing system belongs to the field of hydraulic pressure. The problem of single performance and small load adjustment range existing in the existing hydraulic pump performance testing system is solved. The present invention conducts a dynamic characteristic experiment on a four-quadrant hydraulic pump, can detect the pressure characteristic of the variable mechanism, the variable characteristic in the variable displacement process and the sensitivity to the load, and can realize high and low temperature experiments on the variable mechanism of the four-quadrant hydraulic pump. To detect the variable characteristics of the four-quadrant hydraulic pump variable mechanism under different temperature conditions, the load of the test system can be adjusted through electrical signals. The invention is suitable for the variable characteristic test of the four-quadrant hydraulic pump.

Description

A comprehensive test system for variable characteristics of four-quadrant hydraulic pumps

technical field

The invention belongs to the hydraulic field.

Background technique

Hydraulic transmission has many advantages such as high power density, compact structure, flexible layout, and high control precision, and is widely used in various electromechanical systems. The four-quadrant hydraulic pump is an important component of the hydraulic system, and its performance directly affects the performance of the hydraulic system. It is an indispensable component of the hydraulic system. The variable mechanism of the four-quadrant hydraulic pump has a particularly important influence on the dynamic characteristics of the four-quadrant hydraulic pump. Therefore, testing the performance of the variable mechanism of the four-quadrant hydraulic pump is an indispensable link in design and production. The design and production can be guided by the performance detection of the variable mechanism of the four-quadrant hydraulic pump. However, most of the existing hydraulic pump performance testing systems have the problems of single performance and small load adjustment range.

Contents of the invention

The purpose of the present invention is to provide a four-quadrant hydraulic pump variable characteristic comprehensive testing system in order to solve the problems of single performance and small load adjustment range in the existing hydraulic pump performance testing system.

A four-quadrant hydraulic pump variable characteristic comprehensive testing system according to the present invention, the system includes: a speed sensor, a first motor, a torque sensor, a first balance valve, a second balance valve, a first overflow valve, and a pressure cut-off device , the first hydraulic pump, oil tank, first stop valve, second stop valve, third stop valve, fourth stop valve, electromagnetic reversing valve, second hydraulic pump, second relief valve and proportional loading valve;

The drive end of the four-quadrant hydraulic pump to be tested is connected to the output shaft of the first motor, the speed sensor collects the speed of the output shaft of the first motor, and the torque sensor is used to collect the speed between the first motor and the drive end of the four-quadrant hydraulic pump to be tested. The torque between the four-quadrant hydraulic pumps to be tested is connected with a port of the first balance valve and a port of the second balance valve at the same time, and the other port of the first balance valve is connected with the port to be tested. One suction/outlet port of the four-quadrant hydraulic pump to be tested is connected, and the other port of the second balance valve is connected to another suction/oil outlet of the four-quadrant hydraulic pump to be tested;

The oil inlet port of the proportional reversing valve of the four-quadrant hydraulic pump to be tested is also connected to one port of the first relief valve, and the other port of the first relief valve is connected to the oil tank;

The oil inlet port of the proportional reversing valve of the four-quadrant hydraulic pump to be tested is also communicated with the oil inlet port of the middle sequence valve of the pressure cut-off device through the pipeline, and the oil return port of the middle sequence valve of the pressure cut-off device is connected with the oil tank;

The two working oil ports of the pressure cut-off device are respectively connected to the two suction/outlet ports of the four-quadrant hydraulic pump to be tested;

The oil outlet port of the proportional reversing valve of the four-quadrant hydraulic pump to be tested is connected to the oil tank;

The oil inlet port of the proportional reversing valve of the four-quadrant hydraulic pump to be tested is also connected to the oil tank through the first hydraulic pump;

One suction/outlet port of the four-quadrant hydraulic pump to be tested is connected to the oil outlet B of the actuator of the electromagnetic reversing valve through the first cut-off valve

The other suction/outlet port of the four-quadrant hydraulic pump to be tested is connected to the oil inlet A of the actuator of the electromagnetic reversing valve through the third stop valve;

The oil outlet P of the actuator of the electromagnetic reversing valve is connected to the oil tank through the second relief valve;

The oil outlet P of the actuator of the electromagnetic reversing valve is also connected to the oil tank through the second hydraulic pump;

The system oil return port T of the electromagnetic reversing valve is connected to the oil tank;

One suction/outlet port of the four-quadrant hydraulic pump to be tested is connected to the oil inlet port of the proportional loading valve through the first cut-off valve, and the oil outlet port of the proportional loading valve is connected to the other suction/outlet port of the four-quadrant hydraulic pump to be tested ;

The other suction/oil outlet of the four-quadrant hydraulic pump to be tested is connected to the oil outlet of the proportional loading valve through the fourth cut-off valve;

The other suction/outlet port of the proportional loading valve is connected to the oil tank.

Further, in the present invention, the first pressure sensor, the second pressure sensor, the third pressure sensor, the fourth pressure sensor, the sixth pressure sensor and the seventh pressure sensor;

The first pressure sensor and the second pressure sensor are arranged at both ends of the variable piston of the four-quadrant hydraulic pump to be measured, and are used to collect the pressure at both ends of the variable piston of the four-quadrant hydraulic pump to be measured;

The third pressure sensor is used to collect the oil outlet pressure of the first hydraulic pump;

The fourth pressure sensor is used to collect the pressure of another suction/outlet port of the four-quadrant hydraulic pump to be tested;

The sixth pressure sensor is used to collect the pressure of a suction/outlet port of the four-quadrant hydraulic pump to be tested;

The seventh pressure sensor is used to collect the oil supply pressure of the second hydraulic pump.

Further, in the present invention, a displacement sensor and an angle sensor are also included;

The displacement sensor is used to collect the displacement signal of the variable piston of the four-quadrant hydraulic pump to be tested, and the angle sensor is used to collect the swash plate angle signal of the four-quadrant hydraulic pump to be tested.

Further, in the present invention, a first flow sensor, a second flow sensor, a third flow sensor, a fourth flow sensor and a fifth flow sensor are also included;

The first flow sensor is used to collect the leakage flow of the drain port of the four-quadrant hydraulic pump to be tested;

The second flow sensor is used to collect the flow rate supplied by the first hydraulic pump to the proportional valve of the four-quadrant pump to be tested;

The third flow sensor is used to collect the flow of the oil supply port of the electromagnetic reversing valve;

The fourth flow sensor is used to collect the flow of the system oil return port T of the electromagnetic reversing valve;

The fifth flow sensor is used to collect the flow of the oil outlet of the proportional loading valve.

Further, in the present invention, a first filter, a second filter, a third filter, a fourth filter and a fifth filter are also included;

The first filter is used to filter the oil that enters the oil inlet port of the proportional reversing valve of the four-quadrant hydraulic pump to be tested through the first hydraulic pump;

The second filter is used to filter the oil entering the oil inlet of the first hydraulic pump;

The third filter is used to filter the oil entering the oil inlet of the second hydraulic pump;

The fourth filter is used to filter the oil in and out of a suction/outlet port of the four-quadrant hydraulic pump to be tested;

The fifth filter is used to filter the oil at the oil inlet of the proportional loading valve.

Further, in the present invention, a heat exchanger, a first cooler and a second cooler are also included;

The heat exchanger is used to exchange heat for the oil at the oil outlet of the first hydraulic pump;

The first cooler is used to cool the oil in the system oil return port T of the electromagnetic reversing valve;

The second cooler is used for cooling the oil at the oil outlet of the proportional loading valve.

Further, in the present invention, a first muffler and a second muffler are also included;

The first muffler is used to stabilize the pressure at the oil outlet of the first hydraulic pump;

The second muffler is used to stabilize the pressure at the oil outlet of the second hydraulic pump.

Further, in the present invention, a first temperature sensor and a second temperature sensor are also included,

The second temperature sensor is used to collect the temperature signal in the fuel tank;

The first temperature sensor is used to collect the oil temperature of the oil inlet port of the first hydraulic pump.

Further, in the present invention, a first one-way valve, a second one-way valve and a third one-way valve are also included;

The oil inlet of the first one-way valve is connected to the oil outlet of the second hydraulic pump, and the oil outlet of the first one-way valve is connected to the oil inlet T of the electromagnetic reversing valve; the oil inlet of the second one-way valve The port is connected to the oil outlet of the fourth filter, and the oil outlet of the second check valve is connected to the oil inlet of the proportional loading valve;

The oil inlet of the third one-way valve is connected with the oil outlet of the fifth filter, and the oil outlet of the third one-way valve is connected with the oil inlet of the proportional loading valve.

Further, in the present invention, the first shut-off valve, the second shut-off valve, the third shut-off valve and the fourth shut-off valve;

The first cut-off valve is arranged between the four-quadrant hydraulic pump to be tested and the proportional loading valve;

The second cut-off valve is arranged between the four-quadrant hydraulic pump to be tested and the oil outlet B of the actuator of the electromagnetic reversing valve;

The third cut-off valve is set between the oil inlet A of the actuator of the electromagnetic reversing valve and the oil tank;

The fourth cut-off valve is arranged on the pipeline between another oil suction/outlet port of the four-quadrant hydraulic pump to be tested and the proportional loading valve.

Further, in the present invention, the fourth one-way valve and the fifth one-way valve;

The oil inlet of the fourth one-way valve is connected to the oil outlet of the proportional loading valve, and the oil outlet of the fourth one-way valve is connected to the suction and discharge ports of the four-quadrant pump to be tested;

The oil inlet of the fifth one-way valve is connected to the oil outlet of the proportional loading valve, and the oil outlet of the fifth one-way valve is connected to the oil suction and discharge ports of the four-quadrant pump.

Further, in the present invention, the first accumulator and the second accumulator;

The oil inlet port of the first accumulator is connected with the oil discharge port of the first hydraulic pump;

The oil inlet port of the second accumulator is connected with the oil discharge port of the second hydraulic pump.

The system of the present invention conducts a dynamic characteristic experiment on the four-quadrant hydraulic pump, and can detect the pressure characteristics of the variable mechanism, the variable characteristics in the process of variable displacement, and the sensitivity to the load, and can realize the high performance of the variable mechanism of the four-quadrant hydraulic pump. The low temperature experiment is used to detect the variable characteristics of the four-quadrant hydraulic pump variable mechanism under different temperature conditions. The load of the test system can be adjusted by electrical signals. The pressure and flow parameters of the oil inlet of the variable mechanism can be adjusted, and the temperature of the oil entering the variable mechanism can be kept constant. Use the muffler to eliminate the influence of the pressure and flow pulsation of the hydraulic pump on the performance detection of the hydraulic valve. The opening size of the proportional loading valve can be adjusted to adjust the hydraulic pump load of the four-quadrant pump, and the experiment of the variable characteristics of the variable mechanism under different working conditions can be realized. The load can be adjusted, and the load under different working conditions can be simulated by controlling different electromagnetic signals through the proportional loading valve, so as to realize the research on the characteristics of the variable mechanism under various working conditions. High and low temperature experiments can also be carried out, and the variable characteristics of the measured variable mechanism under different working conditions can be controlled by heating or cooling the oil in the oil tank. Realize the experiment of different control algorithms of the comprehensive test system, realize the research on the stability of the control algorithm to the variable mechanism. The degree of automatic control is high, and the computer automatic control of the comprehensive test system can be realized.

Description of drawings

Fig. 1 is a schematic diagram of the system structure of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

Specific Embodiment 1: The present embodiment will be described below in conjunction with FIG. 1. A four-quadrant hydraulic pump variable characteristic comprehensive testing system described in this embodiment includes: a rotational speed sensor 1, a first motor 2, a torque sensor 3, a A balance valve 10, a second balance valve 11, a first overflow valve 12, a pressure cut-off device 13, a first hydraulic pump 19, an oil tank 20, a first shut-off valve 26, a second shut-off valve 27, a third shut-off valve 28, The fourth cut-off valve 29, the electromagnetic reversing valve 30, the second hydraulic pump 38, the second overflow valve 41 and the proportional loading valve 46;

The driving end of the four-quadrant hydraulic pump 4 to be tested is connected to the output shaft of the first motor 2, the speed sensor 1 collects the speed of the output shaft of the first motor 2, and the torque sensor 3 is used to collect the output shaft speed of the first motor 2 and the four-quadrant to be tested. The torque between the driving ends of the hydraulic pump 4; the proportional reversing valve oil inlet of the four-quadrant hydraulic pump 4 to be measured is communicated with a port of the first balance valve 10 and a port of the second balance valve 11 at the same time, the Another port of the first balance valve 10 communicates with a suction/oil outlet of the four-quadrant hydraulic pump 4 to be tested, and another port of the second balance valve 11 communicates with another suction/oil outlet of the four-quadrant hydraulic pump 4 to be tested. Mouth connected;

The oil inlet port of the proportional reversing valve of the four-quadrant hydraulic pump 4 to be tested is also connected to one port of the first relief valve 12, and the other port of the first relief valve 12 is connected to the oil tank 20;

The oil inlet port of the proportional reversing valve of the four-quadrant hydraulic pump 4 to be tested is also communicated with the oil inlet port of the middle sequence valve of the pressure cut-off device 13 through a pipeline, and the oil return port of the middle sequence valve of the pressure cut-off device 13 is connected with the oil tank 20 ;

The two working oil ports of the pressure cut-off device 13 are respectively connected to the two suction/outlet ports of the four-quadrant hydraulic pump 4 to be tested;

The proportional reversing valve oil outlet of the four-quadrant hydraulic pump 4 to be tested is connected to the oil tank 20;

The oil inlet port of the proportional reversing valve of the four-quadrant hydraulic pump 4 to be tested is also connected to the oil tank 20 through the first hydraulic pump 19;

One suction/oil outlet of the four-quadrant hydraulic pump 4 to be tested is connected to the actuator oil outlet B of the electromagnetic reversing valve 30 through the first cut-off valve 26;

The other suction/outlet port of the four-quadrant hydraulic pump 4 to be tested is connected to the actuator oil inlet A of the electromagnetic reversing valve 30 through the third cut-off valve 28;

The oil outlet P of the actuator of the electromagnetic reversing valve 30 is connected to the oil tank through the second overflow valve 41;

The oil outlet P of the actuator of the electromagnetic reversing valve 30 is also connected to the oil tank through the second hydraulic pump 38;

The oil return port T of the electromagnetic reversing valve 30 is connected to the oil tank;

One suction/oil outlet of the four-quadrant hydraulic pump 4 to be tested is connected to the oil inlet of the proportional loading valve 46 through the first cut-off valve 26, and the oil outlet of the proportional loading valve 46 is connected to another suction port of the four-quadrant hydraulic pump 4 to be tested. / oil outlet is connected; the oil inlet of proportional loading valve 46 is also communicated with another suction/oil outlet of the four-quadrant hydraulic pump 4 to be measured;

Another suction/oil outlet of the four-quadrant hydraulic pump 4 to be tested is connected to the oil outlet of the proportional loading valve 46 through the fourth cut-off valve 29;

Another suction/oil outlet port of the proportional loading valve 46 is connected to the oil tank.

The output shaft of the first motor described in the present invention is connected with the input shaft of the four-quadrant hydraulic pump, the first balance valve 10 is connected with the oil circuit of the second balance valve 11, and is respectively connected with the inlet and outlet oil ports of the four-quadrant hydraulic pump The oil inlet circuit of the first relief valve 12 is respectively connected with the oil circuit between the two balance valves and the oil inlet circuit of the four-quadrant hydraulic pump to form a closed loop for the four-quadrant hydraulic pump to work. The simulated load circuit connected with the four-quadrant pump closed circuit is constructed as the fourth filter 41, the fifth filter 44, the first one-way valve 42, the second one-way valve 43, the first proportional loading valve 45, the second Cooler 46. The circuit can adjust the load size by changing the electric signal of the proportional loading valve, and simulate the load under different working conditions by changing the electric signal.

The output end of the third motor 37 is connected to the input end of the second hydraulic pump 38, and the output flow of the second hydraulic pump 38 passes through the third check valve 50, the second muffler 48, the first electromagnetic reversing valve 33, and the second accumulator 36 1. The second overflow valve 40 forms an oil supply circuit when testing the motor working condition. The circuit can change the oil supply pressure and flow to measure the variable characteristics of the four-quadrant pump motor under different oil supply pressures.

The detection system for the working performance of the variable mechanism of the four-quadrant hydraulic pump can detect the variable characteristics of the four-quadrant hydraulic pump in the pump working condition and the motor working condition of clockwise operation and counterclockwise operation.

Further, in the present invention, the first pressure sensor 7, the second pressure sensor 8, the third pressure sensor 14, the fourth pressure sensor 21, the sixth pressure sensor 25 and the seventh pressure sensor 34;

The first pressure sensor 7 and the second pressure sensor 8 are arranged at both ends of the variable piston of the four-quadrant hydraulic pump 4 to be measured, and are used to collect the pressure at both ends of the variable piston of the four-quadrant hydraulic pump 4 to be measured;

The third pressure sensor 14 is used to collect the oil outlet pressure of the first hydraulic pump 19;

The fourth pressure sensor 21 is used to collect the pressure of another suction/outlet port of the four-quadrant hydraulic pump 4 to be tested;

The sixth pressure sensor 25 is used to collect the pressure of a suction/outlet port of the four-quadrant hydraulic pump 4 to be tested;

The seventh pressure sensor 34 is used to collect the oil supply pressure of the second hydraulic pump 38 .

Further, in the present invention, a displacement sensor 6 and an angle sensor 5 are also included;

The displacement sensor 6 is used to collect the displacement signal of the variable piston of the four-quadrant hydraulic pump 4 to be tested, and the angle sensor 5 is used to collect the swash plate angle signal of the four-quadrant hydraulic pump to be tested.

Further, in the present invention, the first flow sensor 9, the second flow sensor 15, the third flow sensor 31, the fourth flow sensor 32 and the fifth flow sensor 48 are also included;

The first flow sensor 9 is used to collect the leakage flow of the drain port of the four-quadrant hydraulic pump 4 to be tested;

The second flow sensor 15 is used to collect the flow rate supplied by the first hydraulic pump 19 to the proportional valve of the four-quadrant pump to be measured;

The third flow sensor 31 is used to collect the flow of the oil supply port P of the electromagnetic reversing valve 30;

The fourth flow sensor 32 is used to collect the flow of the oil return port T of the electromagnetic reversing valve 30;

The fifth flow sensor 48 is used to collect the flow of the oil outlet of the proportional loading valve 46 .

The second flow sensor 15 also realizes collecting the flow of the closed oil charge circuit.

Further, in this embodiment, the first filter 16, the second filter 23, the third filter 40, the fourth filter 42 and the fifth filter 45 are also included;

The first filter 16 is used to filter the oil that enters the oil inlet port of the four-quadrant hydraulic pump 4 to be tested through the first hydraulic pump 19;

The second filter 23 is used to filter the oil entering the oil inlet of the first hydraulic pump 19;

The third filter 40 is used to filter the oil entering the oil inlet of the second hydraulic pump 38;

The fourth filter 42 is used to filter the oil in and out of a suction/outlet port of the four-quadrant hydraulic pump 4 to be tested;

The fifth filter 45 is used for filtering the oil in the oil inlet of the proportional loading valve 46 .

Further, in this embodiment, a heat exchanger 22, a first cooler 33 and a second cooler 47 are also included;

The heat exchanger 22 is used to exchange heat for the oil at the oil outlet of the first hydraulic pump 19;

The first cooler 33 is used to cool the oil in the oil return port T of the electromagnetic reversing valve 30;

The second cooler 47 is used for cooling the oil at the oil outlet of the proportional loading valve 46 .

Further, in this embodiment, a first muffler 17 and a second muffler 36 are also included;

The first muffler 17 is used to stabilize the pressure at the oil outlet of the first hydraulic pump 19;

The second muffler 36 is used to stabilize the pressure at the oil outlet of the second hydraulic pump 38 .

Further, in this embodiment, a first temperature sensor 24 and a second temperature sensor 49 are also included,

The second temperature sensor 49 is used to collect the temperature signal in the fuel tank;

The first temperature sensor 24 is used to collect the oil temperature of the oil inlet of the first hydraulic pump 19 .

Further, in this embodiment, a first one-way valve 37, a second one-way valve 43 and a third one-way valve 44 are also included;

The oil inlet of the first one-way valve 37 is connected to the oil outlet of the second hydraulic pump 38, and the oil outlet of the first one-way valve 37 is connected to the oil inlet T of the electromagnetic reversing valve 30; The oil inlet of the valve 43 is connected to the oil outlet of the fourth filter 42, and the oil outlet of the second check valve 43 is connected to the oil inlet of the proportional loading valve 46;

The oil inlet of the third one-way valve 44 is connected to the oil outlet of the fifth filter 45 , and the oil outlet of the third one-way valve 44 is connected to the oil inlet of the proportional loading valve 46 .

Further, in this embodiment, the first cut-off valve 26, the second cut-off valve 27, the third cut-off valve 28 and the fourth cut-off valve 29;

The first cut-off valve 26 is arranged between the four-quadrant hydraulic pump 4 to be tested and the proportional loading valve 46;

The second cut-off valve 27 is arranged between the four-quadrant hydraulic pump 4 to be tested and the actuator oil outlet B of the electromagnetic reversing valve 30;

The third cut-off valve 28 is arranged between the oil inlet A of the actuator of the electromagnetic reversing valve 30 and the oil tank 20;

The fourth cut-off valve 29 is arranged on the pipeline between another suction/outlet port of the four-quadrant hydraulic pump 4 to be tested and the proportional loading valve 46 .

Further, in this embodiment, when detecting the pump working condition of the four-quadrant hydraulic pump, the second cut-off valve 27 and the third cut-off valve 28 are closed, and the first cut-off valve 26 and the fourth cut-off valve 29 are opened.

When detecting the pump working condition of the four-quadrant hydraulic pump, the four-quadrant pump 4 to be tested absorbs oil through the oil discharge port, and the oil liquid passes through the first cut-off valve 26 and the fourth filter 42 sequentially through an oil inlet and outlet of the four-quadrant pump to be tested 4 and the second one-way valve 43 into the oil inlet of the proportional loading valve 46; simultaneously, the oil passes through the fourth cut-off valve 29, the fifth filter 45, and the third one-way valve through another oil inlet and outlet of the four-quadrant pump 4 to be measured. 44 enters the oil inlet port of the proportional loading valve 46, and the oil at the oil outlet port of the proportional loading valve 46 passes through the first cut-off valve 26 and the fourth check valve 51 or returns to the oil through the fourth cut-off valve 29 and the fifth check valve 50. The liquid passes through the four-quadrant pump to be tested.

When the pump rotates clockwise, the oil suction port of the four-quadrant pump is the lower port, and the oil discharge port is the upper port, and the oil flows through the closed circuit through the four-quadrant pump 4 oil discharge port, and passes through the first stop valve 26 and the fourth filter 42. The second one-way valve 43 flows into the proportional loading valve 46, and the second cooler 47 returns to the oil suction port of the four-quadrant pump through the fifth one-way valve 50. The oil lost during the oil flow will be pumped by the first hydraulic pump 19 Carry out oil replenishment.

Further, in this embodiment, when detecting the working condition of the four-quadrant hydraulic pump motor, the second shut-off valve 27 and the third shut-off valve 28 are opened, the first shut-off valve 26 and the fourth shut-off valve 29 are closed, and the second hydraulic pump 38 is opened. .

When detecting the working condition of the four-quadrant hydraulic pump motor, the oil enters the first check valve 37 through the second hydraulic pump 38 and then passes through the second muffler 36, the seventh pressure sensor 34, the electromagnetic reversing valve 30, and the second stop valve 27 . The sixth pressure sensor 25 enters the closed circuit of the four-quadrant pump to be tested and flows back to the third shut-off valve 28, the electromagnetic reversing valve 30, the fourth flow sensor 32 and the first cooler 33 to return to the oil tank through the oil discharge port 20, (the second relief valve 41 reaches a certain pressure and is opened to keep the pressure stable).

When detecting the pump working condition of the four-quadrant hydraulic pump, the load circuit can be simulated to realize the dynamic characteristics of the four-quadrant hydraulic pump clockwise and counterclockwise variable mechanism. When detecting the working condition of the four-quadrant hydraulic pump motor, the measurement of the dynamic characteristics of the variable mechanism in the opposite direction can be realized. The measurement of the dynamic characteristics of the four-quadrant hydraulic pump under the four-quadrant working condition is highly comprehensive, and can complete various optimization experiments on the structure and control of the four-quadrant hydraulic pump, such as variable mechanism structure optimization experiments, variable mechanism control algorithm optimization experiments, two sub-regulation energy-saving optimization experiments, etc.

Further, in this embodiment, the fourth one-way valve 51 and the fifth one-way valve 50;

The oil inlet of the fourth one-way valve 51 is connected to the oil outlet of the proportional loading valve, and the oil outlet of the fourth one-way valve 51 is connected to the suction and discharge port of the four-quadrant pump to be measured;

The oil inlet of the fifth one-way valve 50 is connected to the oil outlet of the proportional loading valve, and the oil outlet of the fifth one-way valve 50 is connected to the suction and discharge ports of the four-quadrant pump.

Further, in this embodiment, the first accumulator 18 and the second accumulator 35;

The oil inlet port of the first accumulator 18 is connected with the oil discharge port of the first hydraulic pump 19;

The oil inlet port of the second accumulator 35 is connected with the oil outlet port of the second hydraulic pump 38 .

Further, in the present invention, a controller is also included, and the controller is used to control the displacement of the four-quadrant hydraulic pump 4 to be tested.

The controller is a variable mechanism that controls the four-quadrant pump. The displacement of the four-quadrant pump 4 is changed by providing a current signal to the variable mechanism. When the four-quadrant pump 4 needs to change the displacement, the controller transmits the current signal to the proportional solenoid. A force of iron makes the proportional valve spool of the four-quadrant pump 4 move, and at the same time, the variable piston enters the oil, and drives the swash plate to move at the same time. When the system stops, the signal is 0.

Using the system of the present invention to carry out dynamic characteristic experiments on the four-quadrant hydraulic pump, the pressure characteristics of the variable mechanism, the variable characteristics in the variable displacement process and the sensitivity to the load can be detected, and the variable mechanism of the four-quadrant hydraulic pump can be realized. High and low temperature experiments, testing the variable characteristics of the variable mechanism of the four-quadrant hydraulic pump under different temperature conditions. The load of the test system can be adjusted by electrical signals. The temperature of the oil in the variable mechanism is constant. The muffler is used to eliminate the influence of the pressure and flow pulsation of the hydraulic pump on the performance detection of the hydraulic valve. It can also adjust the opening size of the proportional loading valve to adjust the hydraulic pump load of the four-quadrant pump, so as to realize the experiment of the variable characteristics of the variable mechanism under different working conditions. At the same time, the present invention can simulate the load under different working conditions by controlling different electromagnetic signals of the proportional loading valve, so as to realize the research on the characteristics of the variable mechanism under various working conditions. When conducting high and low temperature experiments, the variable characteristics of the measured variable mechanism under different working conditions are controlled by heating or cooling the oil in the oil tank. It can realize the experiment of different control algorithms of the comprehensive test system, and realize the research of the stability of the control algorithm on the variable mechanism. The present invention realizes precise feedback control of the swash plate angle by collecting parameters such as the rotational speed, torque, flow rate, variable piston displacement of the variable mechanism, and swash plate angle during the working process of the four-quadrant pump, and the system has a high degree of automatic control and can Realize the computer automatic control of the comprehensive test system.

Although the invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the invention. It is therefore to be understood that numerous modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the invention as defined by the appended claims. It shall be understood that different dependent claims and features described herein may be combined in a different way than that described in the original claims. It will also be appreciated that features described in connection with individual embodiments can be used in other described embodiments.

Claims (10)

1. A four-quadrant hydraulic pump variable characteristic comprehensive test system, characterized in that the system comprises: a rotation speed sensor (1), a first motor (2), a torque sensor (3), a first balance valve (10), a second balance valve (11), a first overflow valve (12), a pressure cut-off (13), a first hydraulic pump (19), an oil tank (20), a first stop valve (26), a second stop valve (27), a third stop valve (28), a fourth stop valve (29), an electromagnetic directional valve (30), a second hydraulic pump (38), a second overflow valve (41) and a proportional loading valve (46);

the driving end of the four-quadrant hydraulic pump (4) to be tested is in transmission connection with the output shaft of the first motor (2), the rotating speed sensor (1) is used for collecting the rotating speed of the output shaft of the first motor (2), and the torque sensor (3) is used for collecting the torque between the first motor (2) and the driving end of the four-quadrant hydraulic pump (4) to be tested; the oil inlet of the proportional reversing valve of the four-quadrant hydraulic pump (4) to be tested is simultaneously communicated with one port of the first balance valve (10) and one port of the second balance valve (11), the other port of the first balance valve (10) is communicated with one oil suction/outlet of the four-quadrant hydraulic pump (4) to be tested, and the other port of the second balance valve (11) is communicated with the other oil suction/outlet of the four-quadrant hydraulic pump (4) to be tested;

the oil inlet of the proportional reversing valve of the four-quadrant hydraulic pump (4) to be tested is also connected with one port of the first overflow valve (12), and the other port of the first overflow valve (12) is connected with an oil tank (20);

the oil inlet of the proportional reversing valve of the four-quadrant hydraulic pump (4) to be tested is also communicated with the oil inlet of the middle sequence valve of the pressure cutter (13) through a pipeline, and the oil return port of the middle sequence valve of the pressure cutter (13) is communicated with the oil tank (20);

two working oil ports of the pressure cutter (13) are respectively connected with two oil suction/discharge ports of the four-quadrant hydraulic pump (4) to be tested;

an oil outlet of a proportional reversing valve of the four-quadrant hydraulic pump (4) to be tested is connected with an oil tank (20);

the oil inlet of the proportional reversing valve of the four-quadrant hydraulic pump (4) to be tested is also connected with an oil tank (20) through a first hydraulic pump (19);

one oil suction/outlet of the four-quadrant hydraulic pump (4) to be tested is connected with an execution element oil outlet B of an electromagnetic directional valve (30) through a first stop valve (26);

the other oil suction/discharge port of the four-quadrant hydraulic pump (4) to be tested is connected with an actuating element oil inlet A of an electromagnetic directional valve (30) through a third stop valve (28);

an oil outlet P of an actuating element of the electromagnetic directional valve (30) is connected with an oil tank through a second overflow valve (41);

the oil outlet P of the executive component of the electromagnetic directional valve (30) is also connected with an oil tank through a second hydraulic pump (38);

the system oil return port T of the electromagnetic directional valve (30) is connected with an oil tank;

one oil suction/outlet of the four-quadrant hydraulic pump (4) to be tested is connected with an oil inlet of a proportional loading valve (46) through a first stop valve (26), and the oil outlet of the proportional loading valve (46) is communicated with the other oil suction/outlet of the four-quadrant hydraulic pump (4) to be tested;

the other oil suction/outlet of the four-quadrant hydraulic pump (4) to be tested is connected with the oil outlet of the proportional loading valve (46) through a fourth stop valve (29);

the other oil suction/discharge port of the proportional loading valve (46) is connected with an oil tank;

the system is used for carrying out dynamic characteristic experiments on the four-quadrant hydraulic pump, detecting the pressure characteristic of the variable mechanism, the variable characteristic in the variable displacement process and the sensitivity characteristic to load, realizing high-low temperature experiments on the variable mechanism of the four-quadrant hydraulic pump, detecting the variable characteristic of the variable mechanism of the four-quadrant hydraulic pump under different temperature conditions, regulating the load of the test system through an electric signal, and simultaneously regulating the pressure and flow parameters of an oil inlet of the variable mechanism, and keeping the temperature of oil entering the variable mechanism constant.

2. A four-quadrant hydraulic pump variable characteristic comprehensive test system according to claim 1, characterized in that the first pressure sensor (7), the second pressure sensor (8), the third pressure sensor (14), the fourth pressure sensor (21), the sixth pressure sensor (25) and the seventh pressure sensor (34);

the first pressure sensor (7) and the second pressure sensor (8) are arranged at two ends of the pump body variable piston of the four-quadrant hydraulic pump (4) to be detected and are used for collecting the pressure at two ends of the pump body variable piston of the four-quadrant hydraulic pump (4) to be detected;

the third pressure sensor (14) is used for collecting the oil outlet pressure of the first hydraulic pump (19);

the fourth pressure sensor (21) is used for collecting the pressure of the other oil suction/outlet of the four-quadrant hydraulic pump (4) to be tested;

the sixth pressure sensor (25) is used for collecting the pressure of one oil suction/outlet of the four-quadrant hydraulic pump (4) to be tested;

the seventh pressure sensor (34) is used for acquiring the oil supply pressure of the second hydraulic pump (38).

3. A four-quadrant hydraulic pump variable characteristic comprehensive test system according to claim 1 or 2, further comprising a displacement sensor (6) and an angle sensor (5);

the displacement sensor (6) is used for collecting displacement signals of variable pistons of the four-quadrant hydraulic pump (4) to be measured, and the angle sensor (5) is used for collecting angle signals of a swash plate of the four-quadrant pump to be measured.

4. A four-quadrant hydraulic pump variable characteristic comprehensive test system according to claim 1 or 2, further comprising a first flow sensor (9), a second flow sensor (15), a third flow sensor (31), a fourth flow sensor (32) and a fifth flow sensor (48);

the first flow sensor (9) is used for collecting leakage flow of an oil drain port of the four-quadrant hydraulic pump (4) to be tested;

the second flow sensor (15) is used for collecting the flow of the first hydraulic pump (19) supplied to the proportional valve of the four-quadrant pump to be tested;

the third flow sensor (31) is used for collecting the flow of an oil inlet P of the electromagnetic directional valve (30);

the fourth flow sensor (32) is used for collecting the flow of an oil return port T of the electromagnetic directional valve (30);

the fifth flow sensor (48) is used for collecting the flow of the oil outlet of the proportional loading valve (46).

5. The four-quadrant hydraulic pump variable characteristic comprehensive test system according to claim 4, further comprising a first filter (16), a second filter (23), a third filter (40), a fourth filter (42) and a fifth filter (45);

the first filter (16) is used for filtering oil entering an oil inlet of a proportional reversing valve of the four-quadrant hydraulic pump (4) to be tested through the first hydraulic pump (19);

the second filter (23) is used for filtering oil entering an oil inlet of the first hydraulic pump (19);

the third filter (40) is used for filtering oil entering an oil inlet of the second hydraulic pump (38);

the fourth filter (42) is used for filtering oil entering and exiting from one oil suction/outlet of the four-quadrant hydraulic pump (4) to be tested;

the fifth filter (45) is used for filtering oil in an oil inlet of the proportional loading valve (46).

6. A four-quadrant hydraulic pump variable characteristic comprehensive test system according to claim 1 or 5, further comprising a heat exchanger (22), a first cooler (33) and a second cooler (47);

the heat exchanger (22) is used for exchanging heat of oil at an oil inlet port of the first hydraulic pump (19);

the first cooler (33) is used for cooling oil in an oil return port T of the electromagnetic directional valve (30) system;

the second cooler (47) is used for cooling oil in an oil outlet of the proportional loading valve (46).

7. A four-quadrant hydraulic pump variable characteristic comprehensive test system according to claim 1, further comprising a first muffler (17) and a second muffler (36);

the first muffler (17) is used for stabilizing the oil drain pressure of the first hydraulic pump (19);

the second muffler (36) is used for stabilizing the oil outlet pressure of the second hydraulic pump (38).

8. A four-quadrant hydraulic pump variable characteristic integrated test system according to claim 1, characterized by a first accumulator (18) and a second accumulator (35);

an oil inlet of the first energy accumulator (18) is connected with an oil outlet of the first hydraulic pump (19);

the oil inlet of the second energy accumulator (35) is connected with the oil outlet of the second hydraulic pump (38).

9. The four-quadrant hydraulic pump variable characteristic comprehensive test system according to claim 1, further comprising a first check valve (37), a second check valve (43) and a third check valve (44);

an oil inlet of the first one-way valve (37) is connected with an oil outlet of the second hydraulic pump (38), and an oil outlet of the first one-way valve (37) is connected with an oil inlet T of the electromagnetic directional valve (30); an oil inlet of the second one-way valve (43) is connected with an oil outlet of the fourth filter (42), and an oil outlet of the second one-way valve (43) is connected with an oil inlet of the proportional loading valve (46);

an oil inlet of the third one-way valve (44) is connected with an oil outlet of the fifth filter (45), and an oil outlet of the third one-way valve (44) is connected with an oil inlet of the proportional loading valve (46).

10. The four-quadrant hydraulic pump variable characteristic comprehensive test system according to claim 1, wherein a first stop valve (26), a second stop valve (27), a third stop valve (28) and a fourth stop valve (29);

the first stop valve (26) is arranged between the four-quadrant hydraulic pump (4) to be tested and the proportional loading valve (46);

the second stop valve (27) is arranged between the four-quadrant hydraulic pump (4) to be tested and the executive component oil outlet B of the electromagnetic directional valve (30);

the third stop valve (28) is arranged between an actuating element oil inlet A of the electromagnetic directional valve (30) and the oil tank (20);

the fourth stop valve (29) is arranged on a pipeline between the other suction/discharge port of the four-quadrant hydraulic pump (4) to be tested and the proportional loading valve (46).

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