CN115199523A - Four-quadrant hydraulic pump variable characteristic comprehensive test system - Google Patents
Four-quadrant hydraulic pump variable characteristic comprehensive test system Download PDFInfo
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- CN115199523A CN115199523A CN202210871435.8A CN202210871435A CN115199523A CN 115199523 A CN115199523 A CN 115199523A CN 202210871435 A CN202210871435 A CN 202210871435A CN 115199523 A CN115199523 A CN 115199523A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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Abstract
A four-quadrant hydraulic pump variable characteristic comprehensive test system belongs to the field of hydraulic pressure. The system solves the problems of single performance and small load adjusting range of the existing hydraulic pump performance testing system. The dynamic characteristic test system for the four-quadrant hydraulic pump can be used for carrying out a dynamic characteristic test on the four-quadrant hydraulic pump, detecting the pressure characteristic of a variable mechanism and the variable characteristic in a variable displacement process and the sensitive characteristic to a load, realizing a high-low temperature test 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, and adjusting the load of the test system through an electric signal. The method is suitable for testing the variable characteristic of the four-quadrant hydraulic pump.
Description
Technical Field
The invention belongs to the field of hydraulic pressure.
Background
The hydraulic transmission has the advantages of high power density, compact structure, flexible arrangement, high control precision and the like, and is widely applied to various electromechanical systems, the four-quadrant hydraulic pump is an important element of the hydraulic system, the performance of the four-quadrant hydraulic pump directly influences the service performance of the hydraulic system and is an indispensable element of the hydraulic system, and the variable mechanism of the four-quadrant hydraulic pump particularly influences the dynamic characteristics of the four-quadrant hydraulic pump, so that the detection of the performance of the variable mechanism of the four-quadrant hydraulic pump is an indelible link in design and production. Design and production can be guided by detecting the performance of the variable mechanism of the four-quadrant hydraulic pump. However, most of the existing hydraulic pump performance test systems have the problems of single performance and small load adjustment range.
Disclosure of Invention
The invention aims to solve the problems of single performance and small load regulation range of the conventional hydraulic pump performance test system, and provides a four-quadrant hydraulic pump variable characteristic comprehensive test system.
The invention relates to a four-quadrant hydraulic pump variable characteristic comprehensive test system, which comprises: the device comprises a rotating speed sensor, a first motor, a torque sensor, a first balance valve, a second balance valve, a first overflow valve, a pressure cut-off device, a first hydraulic pump, an oil tank, a first stop valve, a second stop valve, a third stop valve, a fourth stop valve, an electromagnetic directional valve, a second hydraulic pump, a second overflow valve and a proportional loading valve;
the driving end of the four-quadrant hydraulic pump to be tested is in transmission connection with the output shaft of the first motor, the rotating speed sensor is used for acquiring the rotating speed of the output shaft of the first motor, and the torque sensor is used for acquiring the torque between the first motor and the driving end of the four-quadrant hydraulic pump to be tested; an oil inlet of a proportional reversing valve of the to-be-tested four-quadrant hydraulic pump is simultaneously communicated with one port of a first balance valve and one port of a second balance valve, the other port of the first balance valve is communicated with one oil suction/discharge port of the to-be-tested four-quadrant hydraulic pump, and the other port of the second balance valve is communicated with the other oil suction/discharge port of the to-be-tested four-quadrant hydraulic pump;
an oil inlet of a proportional reversing valve of the four-quadrant hydraulic pump to be tested is also connected with one port of a first overflow valve, and the other port of the first overflow valve is connected with an oil tank;
an oil inlet of a proportional reversing valve of the four-quadrant hydraulic pump to be tested is also communicated with an oil inlet of a middle sequence valve of the pressure disconnector through a pipeline, and an oil return port of the middle sequence valve of the pressure disconnector is communicated with an oil tank;
two working oil ports of the pressure cutter are respectively connected with two oil suction/discharge ports of the four-quadrant hydraulic pump to be tested;
the oil outlet of a proportional reversing valve of the four-quadrant hydraulic pump to be tested is connected with an oil tank;
an oil inlet of a proportional reversing valve of the four-quadrant hydraulic pump to be tested is also connected with an oil tank through a first hydraulic pump;
one oil suction/outlet of the four-quadrant hydraulic pump to be tested is connected with an oil outlet B of an actuating element of an electromagnetic reversing valve through a first stop valve
The other oil suction/discharge port of the four-quadrant hydraulic pump to be tested is connected with an oil inlet A of an actuating element of the electromagnetic directional valve through a third stop valve;
an oil outlet P of an actuating element of the electromagnetic directional valve is connected with an oil tank through a second overflow valve;
an oil outlet P of an actuating element of the electromagnetic directional valve is also connected with an oil tank through a second hydraulic pump;
a system oil return port T of the electromagnetic directional valve is connected with an oil tank;
one oil suction/outlet of the to-be-tested four-quadrant hydraulic pump is connected with an oil inlet of a proportional loading valve through a first stop valve, and an oil outlet of the proportional loading valve is communicated with the other oil suction/outlet of the to-be-tested four-quadrant hydraulic pump;
the other oil suction/outlet of the to-be-tested four-quadrant hydraulic pump is connected with the oil outlet of the proportional loading valve through a fourth stop valve;
the other oil suction/outlet port of the proportional loading valve is connected with an oil tank.
Further, in the present invention, a first pressure sensor, a second pressure sensor, a third pressure sensor, a fourth pressure sensor, a sixth pressure sensor, and a seventh pressure sensor;
the first pressure sensor and the second pressure sensor are arranged at two ends of a variable piston of a pump body of the four-quadrant hydraulic pump to be measured and are used for acquiring the pressure at the two ends of the variable piston of the pump body of the four-quadrant hydraulic pump to be measured;
the third pressure sensor is used for acquiring the pressure of an oil outlet of the first hydraulic pump;
the fourth pressure sensor is used for acquiring the pressure of the other oil suction/outlet of the four-quadrant hydraulic pump to be detected;
the sixth pressure sensor is used for acquiring the pressure of one oil suction/outlet of the four-quadrant hydraulic pump to be detected;
the seventh pressure sensor is used for collecting the oil supply pressure of the second hydraulic pump.
Furthermore, the invention also comprises a displacement sensor and an angle sensor;
the displacement sensor is used for acquiring displacement signals of variable pistons of the four-quadrant hydraulic pump to be measured, and the angle sensor is used for acquiring angle signals of a swash plate of the four-quadrant hydraulic pump to be measured.
Further, the invention also comprises a first flow sensor, a second flow sensor, a third flow sensor, a fourth flow sensor and a fifth flow sensor;
the first flow sensor is used for acquiring the leakage flow of the oil drainage port of the four-quadrant hydraulic pump to be detected;
the second flow sensor is used for acquiring the flow supplied by the first hydraulic pump to the four-quadrant pump proportional valve to be detected;
the third flow sensor is used for collecting the flow of an oil supply port of the electromagnetic directional valve;
the fourth flow sensor is used for collecting the flow of a system oil return port T of the electromagnetic directional valve;
and the fifth flow sensor is used for acquiring the flow of the oil outlet of the proportional loading valve.
Further, the invention also comprises a first filter, a second filter, a third filter, a fourth filter and a fifth filter;
the first filter is used for filtering oil entering an oil inlet of a proportional reversing valve of the four-quadrant hydraulic pump to be tested through the first hydraulic pump;
the second filter is used for filtering oil entering the oil inlet of the first hydraulic pump;
the third filter is used for filtering oil entering the oil inlet of the second hydraulic pump;
the fourth filter is used for filtering oil entering and exiting from one oil suction/outlet of the four-quadrant hydraulic pump to be tested;
and the fifth filter is used for filtering oil at the oil inlet of the proportional loading valve.
Further, the invention also comprises a heat exchanger, a first cooler and a second cooler;
the heat exchanger is used for exchanging heat for oil at the oil outlet of the first hydraulic pump;
the first cooler is used for cooling oil at a system oil return port T of the electromagnetic reversing valve;
and the second cooler is used for cooling the oil at the oil outlet of the proportional loading valve.
Further, the invention also comprises a first silencer and a second silencer;
the first silencer is used for stabilizing the pressure of the oil outlet of the first hydraulic pump;
the second muffler is used for stabilizing the pressure of the oil outlet of the second hydraulic pump.
Furthermore, the invention also comprises a first temperature sensor and a second temperature sensor,
the second temperature sensor is used for acquiring a temperature signal in the oil tank;
the first temperature sensor is used for collecting the oil temperature of an oil inlet of the first hydraulic pump.
Furthermore, the invention also comprises a first one-way valve, a second one-way valve and a third one-way valve;
an oil inlet of the first one-way valve is connected with an oil outlet of the second hydraulic pump, and an oil outlet of the first one-way valve is connected with an oil inlet T of the electromagnetic directional valve; an oil inlet of the second one-way valve is connected with an oil outlet of the fourth filter, and an oil outlet of the second one-way valve is connected with an oil inlet of the proportional loading valve;
an oil inlet of the third one-way valve is connected with an oil outlet of the fifth filter, and an oil outlet of the third one-way valve is connected with an oil inlet of the proportional loading valve.
Further, in the present invention, a first stop valve, a second stop valve, a third stop valve and a fourth stop valve;
the first stop valve is arranged between the four-quadrant hydraulic pump to be tested and the proportional loading valve;
the second stop valve is arranged between the four-quadrant hydraulic pump to be tested and an oil outlet B of an actuating element of the electromagnetic directional valve;
the third stop valve is arranged between an oil inlet A of an actuating element of the electromagnetic directional valve and the oil tank;
the fourth stop valve is arranged on a pipeline between the other oil suction/outlet of the four-quadrant hydraulic pump to be tested and the proportional loading valve.
Further, in the present invention, a fourth check valve and a fifth check valve;
an oil inlet of the fourth one-way valve is connected with an oil outlet of the proportional loading valve, and an oil outlet of the fourth one-way valve is connected with an oil suction and discharge port of the four-quadrant pump to be tested;
an oil inlet of the fifth one-way valve is connected with an oil outlet of the proportional loading valve, and an oil outlet of the fifth one-way valve is connected with an oil suction and discharge port of the four-quadrant pump.
Further, in the present invention, the first accumulator and the second accumulator;
an oil inlet of the first energy accumulator is connected with an oil discharge port of the first hydraulic pump;
an oil inlet of the second energy accumulator is connected with an oil outlet of the second hydraulic pump.
The system provided by the invention is used for carrying out a dynamic characteristic experiment on the four-quadrant hydraulic pump, can detect the pressure characteristic of the variable mechanism and the variable characteristic and the sensitive characteristic to the load in the variable displacement process, can realize high and low temperature experiments on the variable mechanism of the four-quadrant hydraulic pump, can detect the variable characteristic of the variable mechanism of the four-quadrant hydraulic pump under different temperature conditions, and can regulate the load of the test system through electric signals. The pressure and the flow parameter of the oil inlet of the variable mechanism can be adjusted, and the temperature of oil entering the variable mechanism can be kept constant. The silencer is used for eliminating the influence of 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 be the load of the hydraulic pump of the four-quadrant pump, and the experiment of variable mechanism variable characteristics under different working conditions is realized. The load can be adjusted, and different electromagnetic signals can be controlled through the proportional loading valve to simulate the load under different working conditions, so that the research on the variable mechanism characteristics under various working conditions can be realized. And the variable characteristic of the measured variable mechanism under different working conditions can be controlled by heating or cooling the oil liquid in the oil tank. The experiment of different control algorithms of the comprehensive test system is realized, and the research of the control algorithms on the stability of the variable mechanism is realized. The automatic control degree is high, and the computer automatic control of the comprehensive test system can be realized.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The first embodiment is as follows: the present embodiment will be described with reference to fig. 1, and the system for comprehensively testing the variable characteristics of the four-quadrant hydraulic pump according to the present embodiment includes: a rotation speed sensor 1, a first electric 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 device 13, a first hydraulic pump 19, an oil tank 20, a first cut-off valve 26, a second cut-off valve 27, a third cut-off valve 28, a fourth cut-off 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 acquiring the rotating speed of the output shaft of the first motor 2, and the torque sensor 3 is used for acquiring the torque between the first motor 2 and the driving end of the four-quadrant hydraulic pump 4 to be tested; an oil inlet of a proportional reversing valve of the to-be-tested four-quadrant hydraulic pump 4 is simultaneously communicated with one port of a first balance valve 10 and one port of a second balance valve 11, the other port of the first balance valve 10 is communicated with one oil suction/discharge port of the to-be-tested four-quadrant hydraulic pump 4, and the other port of the second balance valve 11 is communicated with the other oil suction/discharge port of the to-be-tested four-quadrant hydraulic pump 4;
an oil inlet of a proportional reversing valve of the four-quadrant hydraulic pump 4 to be tested is also connected with one port of a first overflow valve 12, and the other port of the first overflow valve 12 is connected with an oil tank 20;
an oil inlet of a proportional reversing valve of the four-quadrant hydraulic pump 4 to be tested is also communicated with an oil inlet of a middle sequence valve of the pressure disconnector 13 through a pipeline, and an oil return port of the middle sequence valve of the pressure disconnector 13 is communicated with an 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;
the oil outlet of the proportional reversing valve of the four-quadrant hydraulic pump 4 to be tested is connected with the oil tank 20;
an oil inlet of a 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 oil outlet B of an actuating element 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 oil inlet A of an actuating element of an electromagnetic directional valve 30 through a third stop valve 28;
an actuating element oil outlet P of the electromagnetic directional valve 30 is connected with an oil tank through a second overflow valve 41;
the oil outlet P of the actuating element of the electromagnetic directional valve 30 is also connected with an oil tank through a second hydraulic pump 38;
an oil return port T of the electromagnetic directional valve 30 is connected with an oil tank;
one oil suction/outlet of the to-be-tested four-quadrant hydraulic pump 4 is connected with an oil inlet of a proportional loading valve 46 through a first stop valve 26, and an oil outlet of the proportional loading valve 46 is communicated with the other oil suction/outlet of the to-be-tested four-quadrant hydraulic pump 4; the oil inlet of the proportional loading valve 46 is also communicated with the other oil suction/discharge port 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 suction/discharge port of the proportional loading valve 46 is connected to the oil tank.
The output shaft of a first motor is connected with the input shaft of a four-quadrant hydraulic pump, a first balance valve 10 is connected with an oil path of a second balance valve 11 and is respectively connected with an oil inlet and an oil outlet of the four-quadrant hydraulic pump, and an oil inlet path of a first overflow valve 12 is respectively connected with an oil path between two balance valves and an oil inlet path of the four-quadrant hydraulic pump to form a closed loop for the working of the four-quadrant hydraulic pump. The analog load circuit connected with the four-quadrant pump closed circuit is constructed by a fourth filter 41, a fifth filter 44, a first check valve 42, a second check valve 43, a first proportional loading valve 45 and a second cooler 46. The loop can adjust the load size by changing the size of 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 electric motor 37 is connected with the input end of the second hydraulic pump 38, and the output flow of the second hydraulic pump 38 passes through the third one-way valve 50, the second muffler 48, the first electromagnetic directional valve 33, the second energy accumulator 36 and the second overflow valve 40 to form an oil supply loop when the working condition of the motor is tested. The circuit can change the oil supply pressure and flow to measure the variable characteristic of the four-quadrant pump motor under different oil supply pressures under the working condition.
The detection system for the working performance of the variable mechanism of the four-quadrant hydraulic pump can detect the variable characteristics of clockwise working and anticlockwise working under two working conditions of the pump working condition and the motor working condition of the four-quadrant hydraulic pump.
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 two ends of a variable piston of a pump body of the four-quadrant hydraulic pump 4 to be tested and are used for acquiring the pressure at two ends of the variable piston of the pump body of the four-quadrant hydraulic pump 4 to be tested;
the third pressure sensor 14 is used for collecting the outlet pressure of the first hydraulic pump 19;
the fourth pressure sensor 21 is used for acquiring the pressure of the other oil suction/discharge port of the four-quadrant hydraulic pump 4 to be detected;
the sixth pressure sensor 25 is used for acquiring the pressure of one oil suction/discharge port of the four-quadrant hydraulic pump 4 to be detected;
the seventh pressure sensor 34 is used to detect the supply pressure of the second hydraulic pump 38.
Further, the invention also comprises 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 hydraulic pump to be measured.
Further, in the present invention, 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 are further included;
the first flow sensor 9 is used for collecting the leakage flow of the oil drainage port of the four-quadrant hydraulic pump 4 to be detected;
the second flow sensor 15 is used for acquiring the flow 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 for collecting the flow of the oil supply port P of the electromagnetic directional valve 30;
the fourth flow sensor 32 is used for acquiring the flow of the oil return port T of the electromagnetic directional valve 30;
a fifth flow sensor 48 is used to collect flow from the outlet of the proportional loading valve 46.
The second flow sensor 15 also realizes the collection of the flow of the closed oil replenishing loop.
Further, in the present embodiment, the filter further includes 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 directional 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 the oil inlet of the second hydraulic pump 38;
the fourth filter 42 is used for filtering oil entering from and exiting from a suction/discharge port of the four-quadrant hydraulic pump 4 to be measured;
a fifth filter 45 is used to filter the oil at the inlet of the proportional charging valve 46.
Further, in the present embodiment, the heat exchanger 22, the first cooler 33, and the second cooler 47 are further included;
the heat exchanger 22 is used for exchanging heat for oil at the oil outlet of the first hydraulic pump 19;
the first cooler 33 is used for cooling oil at the oil return port T of the electromagnetic directional valve 30;
the second cooler 47 is used for cooling the oil at the oil outlet of the proportional charging valve 46.
Further, in the present embodiment, the muffler further includes a first muffler 17 and a second muffler 36;
the first muffler 17 is used for stabilizing the pressure at the outlet of the first hydraulic pump 19;
the second muffler 36 serves to stabilize the outlet pressure of the second hydraulic pump 38.
Further, in the present embodiment, a first temperature sensor 24 and a second temperature sensor 49 are further included,
the second temperature sensor 49 is used for acquiring a temperature signal in the oil tank;
the first temperature sensor 24 is used for acquiring the oil temperature of the oil inlet of the first hydraulic pump 19.
Further, in the present embodiment, a first check valve 37, a second check valve 43, and a third check valve 44 are further included;
an oil inlet of the first one-way valve 37 is connected with an oil outlet of a 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 check valve 43 is connected with an oil outlet of the fourth filter 42, and an oil outlet of the second check valve 43 is connected with an oil inlet of the proportional loading valve 46;
an oil inlet of the third check valve 44 is connected with an oil outlet of the fifth filter 45, and an oil outlet of the third check valve 44 is connected with an oil inlet of the proportional loading valve 46.
Further, in the present embodiment, the first, second, third, and fourth cutoff valves 26, 27, 28, and 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 an actuating element oil outlet B of the electromagnetic directional valve 30;
the third stop valve 28 is arranged between an actuator 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 oil suction/outlet port of the four-quadrant hydraulic pump 4 to be tested and the proportional loading valve 46.
Further, in the present embodiment, when the pump operation condition of the four-quadrant hydraulic pump is detected, the second and third cut-off valves 27 and 28 are closed, and the first and fourth cut-off valves 26 and 29 are opened.
When the pump working condition of the four-quadrant hydraulic pump is detected, the four-quadrant pump 4 to be detected absorbs oil through an oil drainage port, and oil enters an oil inlet of a proportional loading valve 46 through an oil inlet and an oil outlet of the four-quadrant pump 4 to be detected and sequentially passes through a first stop valve 26, a fourth filter 42 and a second one-way valve 43; meanwhile, oil enters the oil inlet of the proportional loading valve 46 through the other oil inlet and outlet of the four-quadrant pump 4 to be tested and sequentially passes through the fifth filter 45 of the fourth stop valve 29 and the third check valve 44, and the oil at the oil outlet of the proportional loading valve 46 returns to the oil through the four-quadrant pump to be tested through the first stop valve 26 and the fourth check valve 51 or through the fourth stop valve 29 and the fifth check valve 50.
When the pump is clockwise rotatory, the oil pick-up mouth of the four-quadrant pump is the lower port, and the oil drain port is the upper port, and fluid passes through the closed return circuit of 4 oil drain port flow directions of four-quadrant pump, and through first stop valve 26, fourth filter 42, second check valve 43 inflow proportion loading valve 46, second cooler 47 pump pick-up mouth of the four-quadrant through fifth check valve 50, and the fluid of fluid flow in-process loss can be mended oil by first hydraulic pump 19.
In the present embodiment, when the four-quadrant hydraulic pump motor operation condition is detected, the second and third cut-off valves 27 and 28 are opened, the first and fourth cut-off valves 26 and 29 are closed, and the second hydraulic pump 38 is opened.
When the working condition of the four-quadrant hydraulic pump motor is detected, oil enters the first check valve 37 through the second hydraulic pump 38, sequentially passes through the second muffler 36, the seventh pressure sensor 34, the electromagnetic directional valve 30, the second stop valve 27 and the sixth pressure sensor 25, enters the four-quadrant pump closed loop to be detected, flows back to the third stop valve 28, the electromagnetic directional valve 30, the fourth flow sensor 32 and the first cooler 33 through the oil outlet, and returns to the oil tank 20 again, (the second overflow valve 41 is opened to a certain pressure to maintain the pressure stable).
When the pump working condition of the four-quadrant hydraulic pump is detected, the dynamic characteristics of the clockwise and anticlockwise direction variable mechanisms of the four-quadrant hydraulic pump can be realized by simulating a load loop. When the working condition of the four-quadrant hydraulic pump motor is detected, the measurement of the dynamic characteristic of the reverse direction variable mechanism can be realized. The measurement of dynamic characteristics of the four-quadrant hydraulic pump under the four-quadrant working condition has high comprehensiveness, and can complete various optimization experiments of the structure and control of the four-quadrant hydraulic pump, such as a variable mechanism structure optimization experiment, a variable mechanism control algorithm optimization experiment, a secondary regulation energy-saving optimization experiment and the like.
Further, in the present embodiment, the fourth check valve 51 and the fifth check valve 50;
an oil inlet of the fourth one-way valve 51 is connected with an oil outlet of the proportional loading valve, and an oil outlet of the fourth one-way valve 51 is connected with an oil suction and discharge port of the four-quadrant pump to be tested;
an oil inlet of the fifth check valve 50 is connected with an oil outlet of the proportional loading valve, and an oil outlet of the fifth check valve 50 is connected with an oil suction and discharge port of the four-quadrant pump.
Further, in the present embodiment, the first accumulator 18 and the second accumulator 35;
the oil inlet of the first accumulator 18 is connected with the oil outlet of the first hydraulic pump 19;
the oil inlet of the second accumulator 35 is connected with the oil outlet of the second hydraulic pump 38.
Further, the invention also comprises a controller, wherein the controller is used for controlling the discharge capacity of the four-quadrant hydraulic pump 4 to be tested.
The controller is a variable mechanism for controlling the four-quadrant pump, the displacement of the four-quadrant pump 4 is changed by providing a current signal for the variable mechanism, when the displacement of the four-quadrant pump 4 needs to be changed, the controller transmits a force to the proportional electromagnet by giving the current signal, so that the valve core of the proportional valve of the four-quadrant pump 4 moves, oil enters the variable piston, the swash plate is driven to move, and when the system stops, the signal is 0.
The system is adopted to carry out a dynamic characteristic experiment on the four-quadrant hydraulic pump, can detect the pressure characteristic of the variable mechanism, the variable characteristic in the variable displacement process and the sensitive characteristic to the load, can realize high and low temperature experiments on the variable mechanism of the four-quadrant hydraulic pump, and can detect the variable characteristic of the variable mechanism of the four-quadrant hydraulic pump under different temperature conditions. The silencer is used for eliminating the influence of 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 form the load of the hydraulic pump of the four-quadrant pump, and the variable mechanism variable characteristic experiment under different working conditions is achieved. Meanwhile, the invention can simulate the load under different working conditions by controlling different electromagnetic signals through the proportional loading valve so as to realize the research on the variable mechanism characteristics under various working conditions. When high and low temperature experiments are carried out, the variable characteristics of the measured variable mechanism under different working conditions are controlled by heating or cooling the oil in the oil tank. The experiment of different control algorithms of the comprehensive test system can be realized, and the research of the control algorithm on the stability of the variable mechanism is realized. The invention realizes the accurate feedback control of the angle of the swash plate by acquiring the parameters of the rotating speed, the torque, the flow, the variable piston displacement of the variable mechanism, the angle of the swash plate and the like in the working process of the four-quadrant pump, has high automatic control degree and can realize the automatic control of a computer of a comprehensive test system.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that various dependent claims and the features described herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (10)
1. A four-quadrant hydraulic pump variable characteristic integrated test system, the system comprising: the hydraulic control system comprises a rotating 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 device (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 an output shaft of the first motor (2), the rotating speed sensor (1) acquires the rotating speed of the output shaft of the first motor (2), and the torque sensor (3) is used for acquiring the torque between the first motor (2) and the driving end of the four-quadrant hydraulic pump (4) to be tested; an oil inlet of a proportional reversing valve of the to-be-tested four-quadrant hydraulic pump (4) is simultaneously communicated with one port of a first balance valve (10) and one port of a second balance valve (11), the other port of the first balance valve (10) is communicated with an oil suction/discharge port of the to-be-tested four-quadrant hydraulic pump (4), and the other port of the second balance valve (11) is communicated with the other oil suction/discharge port of the to-be-tested four-quadrant hydraulic pump (4);
an oil inlet of a proportional reversing valve of the to-be-tested four-quadrant hydraulic pump (4) is also connected with one port of a first overflow valve (12), and the other port of the first overflow valve (12) is connected with an oil tank (20);
an oil inlet of a proportional reversing valve of the to-be-tested four-quadrant hydraulic pump (4) is also communicated with an oil inlet of a middle sequence valve of the pressure disconnector (13) through a pipeline, and an oil return port of the middle sequence valve of the pressure disconnector (13) is communicated with an oil tank (20);
two working oil ports of the pressure disconnector (13) are respectively connected with two oil suction/discharge ports of the four-quadrant hydraulic pump (4) to be tested;
the oil outlet of a proportional reversing valve of the four-quadrant hydraulic pump (4) to be tested is connected with an oil tank (20);
an oil inlet of a proportional reversing valve of the to-be-tested four-quadrant hydraulic pump (4) 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 oil outlet B of an actuating element of an electromagnetic directional valve (30) through a first stop valve (26);
the other oil suction/outlet of the four-quadrant hydraulic pump (4) to be tested is connected with an oil inlet A of an actuating element 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);
an actuating element oil outlet P of the electromagnetic directional valve (30) is also connected with an oil tank through a second hydraulic pump (38);
a system oil return port T of the electromagnetic directional valve (30) is connected with an oil tank;
one oil suction/outlet of the to-be-tested four-quadrant hydraulic pump (4) 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 to-be-tested four-quadrant hydraulic pump (4);
the other oil suction/outlet of the to-be-tested four-quadrant hydraulic pump (4) is connected with the oil outlet of the proportional loading valve (46) through a fourth stop valve (29);
the other oil suction/outlet port of the proportional loading valve (46) is connected with an oil tank.
2. The comprehensive test system for the variable characteristic of the four-quadrant hydraulic pump 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 a variable piston of a pump body of the four-quadrant hydraulic pump (4) to be tested and are used for acquiring the pressure at two ends of the variable piston of the pump body of the four-quadrant hydraulic pump (4) to be tested;
the third pressure sensor (14) is used for collecting the pressure of an oil outlet of the first hydraulic pump (19);
the fourth pressure sensor (21) is used for acquiring the pressure of the other oil suction/discharge port of the four-quadrant hydraulic pump (4) to be detected;
the sixth pressure sensor (25) is used for acquiring the pressure of a suction/discharge port of the four-quadrant hydraulic pump (4) to be detected;
the seventh pressure sensor (34) is used to detect the supply pressure of the second hydraulic pump (38).
3. The system for comprehensively testing the variable characteristic of the four-quadrant hydraulic pump according to claim 1 or 2, characterized by further comprising a displacement sensor (6) and an angle sensor (5);
the displacement sensor (6) is used for acquiring displacement signals of variable pistons of the four-quadrant hydraulic pump (4) to be tested, and the angle sensor (5) is used for acquiring angle signals of a swash plate of the four-quadrant hydraulic pump to be tested.
4. The four-quadrant hydraulic pump variable characteristic comprehensive test system according to claim 1 or 2, characterized by 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 the leakage flow of an oil drainage port of the four-quadrant hydraulic pump (4) to be detected;
the second flow sensor (15) is used for acquiring the flow supplied by the first hydraulic pump (19) to the proportional valve of the four-quadrant pump to be detected;
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);
and 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 liquid entering and exiting from a suction/oil outlet of the four-quadrant hydraulic pump (4) to be measured;
and the fifth filter (45) is used for filtering the oil at the oil inlet of the proportional loading valve (46).
6. The 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 for oil liquid at an oil inlet of the first hydraulic pump (19);
the first cooler (33) is used for cooling oil at an oil return port T of the system of the electromagnetic directional valve (30);
the second cooler (47) is used for cooling oil at an oil outlet of the proportional loading valve (46).
7. The system for comprehensively testing the variable characteristic of the four-quadrant hydraulic pump according to claim 1, further comprising a first muffler (17) and a second muffler (36);
the first muffler (17) is used for stabilizing the pressure of an oil discharge port of the first hydraulic pump (19);
the second muffler (36) is used for stabilizing the pressure of the oil outlet of the second hydraulic pump (38).
8. The system for comprehensive testing of the variable characteristics of a four-quadrant hydraulic pump according to claim 1, characterized in that the first accumulator (18) and the second accumulator (35);
an oil inlet of the first accumulator (18) is connected with an oil discharge port of the first hydraulic pump (19);
an oil inlet of the second accumulator (35) is connected with an oil outlet of the second hydraulic pump (38).
9. The system for comprehensively testing the variable characteristics of the four-quadrant hydraulic pump 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 a 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 a second one-way valve (43) is connected with an oil outlet of a fourth filter (42), and an oil outlet of the second one-way valve (43) is connected with an oil inlet of a 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 the first stop valve (26), the second stop valve (27), the third stop valve (28) and the 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 to-be-tested four-quadrant hydraulic pump (4) and an oil outlet B of an actuating element 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 oil suction/outlet of the four-quadrant hydraulic pump (4) to be tested and the proportional loading valve (46).
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| CN202210871435.8A CN115199523B (en) | 2022-07-22 | 2022-07-22 | Four-quadrant hydraulic pump variable characteristic comprehensive test system |
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| CN115199523B CN115199523B (en) | 2023-07-14 |
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| CN115199523B (en) | 2023-07-14 |
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