CN112762054B - A comprehensive testing system for hydraulic valve performance - Google Patents

Abstract

A hydraulic valve performance comprehensive testing system relates to the field of experimental equipment. The invention aims to solve the problems of single performance and small load adjustment range of the existing hydraulic valve testing system. The first proportional relief valve, the variable hydraulic pump, the second proportional relief valve, the throttle valve and the hydraulic motor are all in communication with the oil tank, the first proportional relief valve is in communication with the variable hydraulic pump and the first electromagnetic reversing valve at the same time, and the first proportional relief valve is in communication with the variable hydraulic pump and the first electromagnetic reversing valve. An electromagnetic reversing valve communicates with the second electromagnetic reversing valve, the second electromagnetic reversing valve communicates with the pressure reducing valve, the second electromagnetic reversing valve communicates with the speed regulating valve, the pressure reducing valve and the speed regulating valve are connected with the valve under test at the same time The valve under test is also in communication with the third electromagnetic reversing valve, the third electromagnetic reversing valve is in communication with the fourth electromagnetic reversing valve, the fourth electromagnetic reversing valve is in communication with the second proportional relief valve, and the third electromagnetic reversing valve is in communication with the second proportional relief valve. The valve is connected with the hydraulic motor, and the hydraulic motor and the flywheel group are connected or disconnected through the electromagnetic clutch; the two groups of detection groups are respectively used to detect the temperature, pressure and flow of the liquid at the two ports of the valve under test.

Description

A comprehensive testing system for hydraulic valve performance

technical field

The invention belongs to the field of experimental equipment, in particular to performance testing equipment of hydraulic valves.

Background technique

Hydraulic transmission has many advantages such as high power density, compact structure, flexible layout and high control accuracy, and is widely used in various electromechanical systems. The hydraulic valve is an important control component of the hydraulic system, its performance directly affects the performance of the hydraulic system, and is an indispensable component of the hydraulic system. Therefore, testing the performance of hydraulic valves is an indispensable link in the design and production of hydraulic valves. By testing the performance of hydraulic valves, the design of hydraulic valves can be guided and the production quality of hydraulic valves can be controlled. The general hydraulic valve performance test system has a single performance and a small load adjustment range. Therefore, a new experimental system with wide performance and large load adjustment range is urgently needed.

SUMMARY OF THE INVENTION

In order to solve the problems of single performance and small load adjustment range of the existing hydraulic valve performance testing system, the present invention provides a hydraulic valve performance comprehensive testing system.

A hydraulic valve performance comprehensive testing system, comprising: a first proportional relief valve 2, a variable hydraulic pump 4, a first electromagnetic reversing valve 7, a second electromagnetic reversing valve 8, a pressure reducing valve 9, a speed regulating valve 10, The third electromagnetic reversing valve 17, the fourth electromagnetic reversing valve 18, the second proportional relief valve 19, the throttle valve 20, the hydraulic motor 22, the electromagnetic clutch 24, the flywheel group and two sets of detection groups;

One end of the first proportional relief valve 2, the liquid inlet of the variable hydraulic pump 4, one end of the second proportional relief valve 19, one end of the throttle valve 20 and one end of the hydraulic motor 22 are all communicated with the oil tank 1,

The other end of the first proportional relief valve 2 is communicated with the liquid outlet of the variable hydraulic pump 4 and one end of the first electromagnetic reversing valve 7 at the same time,

The other end of the first electromagnetic reversing valve 7 is communicated with the first port of the second electromagnetic reversing valve 8,

The second port of the second electromagnetic reversing valve 8 communicates with one end of the pressure reducing valve 9,

The third port of the second electromagnetic reversing valve 8 is communicated with one end of the speed regulating valve 10,

The other end of the pressure reducing valve 9 and the other end of the speed regulating valve 10 communicate with one end of the valve under test at the same time,

The other end of the valve under test is in communication with the first port of the third electromagnetic reversing valve 17,

The second port of the third electromagnetic reversing valve 17 communicates with the first port of the fourth electromagnetic reversing valve 18,

The second port of the fourth electromagnetic reversing valve 18 communicates with the other end of the second proportional relief valve 19,

The third port of the third electromagnetic reversing valve 17 communicates with the other end of the hydraulic motor 22,

The hydraulic motor 22 and the flywheel set are connected or disconnected through the electromagnetic clutch 24;

Two sets of detection groups are located at both ends of the valve under test, and the two groups of detection groups are respectively used to detect the temperature, pressure and flow of the liquid at the two ports of the valve under test.

Further, the above-mentioned comprehensive testing system for hydraulic valve performance also includes: a cooler 25, a heater 26, a quantitative hydraulic pump 28 and a fifth electromagnetic reversing valve 27, the liquid inlet of the quantitative hydraulic pump 28 is communicated with the oil tank 1, and the quantitative hydraulic pump 28 is connected to the oil tank 1. The liquid outlet of the hydraulic pump 28 is communicated with the liquid inlet of the fifth electromagnetic reversing valve 27 , and the two liquid outlets of the fifth electromagnetic reversing valve 27 are respectively connected with the liquid inlet of the cooler 25 and the liquid inlet of the heater 26 . The liquid outlet of the cooler 25 and the liquid outlet of the heater 26 are both communicated with the oil tank 1 .

Further, the above-mentioned detection group includes: a flow sensor 11, a first temperature sensor 12 and a pressure sensor 13, the flow sensor 11 is used for collecting the liquid flow at the location, the first temperature sensor 12 is used for collecting the liquid temperature at the location, and the pressure sensor 13 is used to collect the fluid pressure at the location.

Further, a check valve 5 is provided on the passage from the variable hydraulic pump 4 to the first electromagnetic reversing valve 7 .

Further, a muffler 6 is provided on the passage between the variable hydraulic pump 4 and the first electromagnetic reversing valve 7 .

Further, the above-mentioned comprehensive testing system for hydraulic valve performance further includes a variable frequency motor for adjusting the flow adjustment range of the variable hydraulic pump 4 .

Further, the above-mentioned comprehensive testing system for hydraulic valve performance also includes: a photoelectric code disc 21 and a torque sensor 23 , the photoelectric code disc 21 is used to collect the rotational angle and rotational speed of the hydraulic motor 22 , and the torque sensor 23 is used to collect the output of the hydraulic motor 22 . torque.

Further, the above-mentioned passage between the quantitative hydraulic pump 28 and the oil tank 1 and the passage between the variable hydraulic pump 4 and the oil tank 1 are all provided with a filter 3 .

Further, the above-mentioned comprehensive testing system for hydraulic valve performance also includes: an exhaust valve 16, a liquid level gauge 15 and a second temperature sensor 14, the second temperature sensor 14 is used to collect the oil temperature in the oil tank 1, and the liquid level gauge 15 is used to calibrate the oil level in the oil tank 1, and the exhaust valve 16 is used to discharge the gas in the oil tank 1.

Further, the above-mentioned first electromagnetic reversing valve 7 is a two-position four-way electromagnetic reversing valve, the second electromagnetic reversing valve 8, the third electromagnetic reversing valve 17, the fourth electromagnetic reversing valve 18, and the fifth electromagnetic reversing valve. The valves 27 are all two-position three-way electromagnetic reversing valves, and the pressure reducing valve 9 is a fixed-value pressure reducing valve.

The hydraulic valve performance comprehensive testing system of the present invention can detect the hydraulic valve flow performance and internal leakage; can perform pressure characteristic experiments on the hydraulic valve; can detect the hydraulic valve pressure characteristics and sensitivity to load; High and low temperature experiments were carried out to detect the pressure-flow characteristics of hydraulic valves under different temperature conditions; multi-functional integration was realized. At the same time, the load can be adjusted to increase the adjustment range of the load.

Description of drawings

1 is a schematic diagram of the principle of a comprehensive testing system for hydraulic valve performance according to the present invention;

2 is a schematic structural diagram of a hydraulic valve performance comprehensive testing system according to the present invention;

FIG. 3 is a schematic diagram of the principle of the temperature regulation part.

Detailed ways

Embodiment 1: This embodiment will be described in detail with reference to FIGS. 1 to 3. A hydraulic valve performance comprehensive testing system described in this embodiment includes: a variable frequency motor, a first proportional relief valve 2, a variable hydraulic pump 4, a first An electromagnetic reversing valve 7, a second electromagnetic reversing valve 8, a pressure reducing valve 9, a speed regulating valve 10, a third electromagnetic reversing valve 17, a fourth electromagnetic reversing valve 18, a second proportional relief valve 19, a throttle Flow valve 20, photoelectric code disc 21, hydraulic motor 22, torque sensor 23, electromagnetic clutch 24, flywheel group, two groups of detection groups and temperature adjustment part.

One end of the first proportional relief valve 2 , the liquid inlet of the variable hydraulic pump 4 , one end of the second proportional relief valve 19 , one end of the throttle valve 20 and one end of the hydraulic motor 22 are all connected with the oil tank 1 storing hydraulic oil. Connected.

The other end of the first proportional relief valve 2 is connected with the liquid outlet of the variable hydraulic pump 4 and one end of the first electromagnetic reversing valve 7 at the same time, and the other end of the first electromagnetic reversing valve 7 is connected with the second electromagnetic reversing valve 8 The first port of the second electromagnetic reversing valve 8 is connected to one end of the pressure reducing valve 9, the third port of the second electromagnetic reversing valve 8 is connected to one end of the speed regulating valve 10, and the The other end and the other end of the speed regulating valve 10 communicate with one end of the valve under test at the same time, and the other end of the valve under test is in communication with the first port of the third electromagnetic reversing valve 17, and the second port of the third electromagnetic reversing valve 17 is connected. The port is in communication with the first port of the fourth electromagnetic reversing valve 18 , the second port of the fourth electromagnetic reversing valve 18 is in communication with the other end of the second proportional relief valve 19 , and the third port of the third electromagnetic reversing valve 17 Connected with the other end of the hydraulic motor 22 , the hydraulic motor 22 and the flywheel set are connected through the electromagnetic clutch 24 , so that the hydraulic motor 22 and the flywheel set can be connected or disconnected through the electrical control of the electromagnetic clutch 24 .

Two sets of detection groups are located at both ends of the valve under test, respectively. The detection groups include: a flow sensor 11 , a first temperature sensor 12 and a pressure sensor 13 , the flow sensor 11 is used to collect the liquid flow at the location, and the first temperature sensor 12 is used to collect The liquid temperature at the location, and the pressure sensor 13 is used to collect the liquid pressure at the location.

A check valve 5 is provided on the passage from the variable hydraulic pump 4 to the first electromagnetic reversing valve 7 , and the check valve 5 is used to prevent the hydraulic oil from flowing back to the variable hydraulic pump 4 .

A muffler 6 is provided on the passage between the variable hydraulic pump 4 and the first electromagnetic reversing valve 7, and the muffler 6 is used to reduce the pressure and flow pulsation of the hydraulic oil discharged from the variable hydraulic pump 4, thereby reducing the pressure and pulsation during detection. influences.

The variable hydraulic pump 4 is used to provide hydraulic oil, and the variable frequency motor is used to adjust the flow adjustment range of the variable hydraulic pump 4 .

The photoelectric code disc 21 is used to collect the rotation angle and rotational speed of the hydraulic motor 22 .

The torque sensor 23 is used to collect the output torque of the hydraulic motor 22 .

The working method of a hydraulic valve performance comprehensive testing system described in this embodiment is:

When the first electromagnetic reversing valve 7 is energized, the first electromagnetic reversing valve 7 communicates with the second electromagnetic reversing valve 8, and when the first electromagnetic reversing valve 7 is de-energized, the first electromagnetic reversing valve 7 and the second electromagnetic reversing valve When the passage of the electromagnetic reversing valve 8 is blocked, the hydraulic shock frequency can be simulated by controlling the on-off of the first electromagnetic reversing valve 7 .

The pressure reducing valve 9 is used to adjust the inlet pressure of the valve under test to a constant value, and the speed regulating valve 10 is used to adjust the inlet flow rate of the valve under test to a constant value. When the second electromagnetic reversing valve 8 is de-energized, the second electromagnetic reversing valve 8 is communicated with the speed regulating valve 10 , and the hydraulic oil enters the tested valve through the speed regulating valve 10 . At this time, the characteristics of the valve under test at a constant inlet flow can be detected. When the second electromagnetic reversing valve 8 is energized, the second electromagnetic reversing valve 8 communicates with the pressure reducing valve 9, and the inlet of the valve under test has a constant pressure. At this time, the characteristics of the valve under test under constant inlet pressure can be detected. The characteristics in the above two cases include leakage in the tested valve, inlet and outlet pressure and temperature. Specifically, the difference between the flow sensors 11 at both ends of the valve under test can be used to measure the leakage in the valve under test. The first temperature sensor 12 and the pressure sensor 13 can be used to measure the pressure and temperature of the hydraulic oil entering and leaving the valve under test.

When the third electromagnetic reversing valve 17 is de-energized and the electromagnetic reversing valve 18 is de-energized, the third electromagnetic reversing valve 17 , the fourth electromagnetic reversing valve 18 and the second proportional relief valve 19 are connected. The second proportional relief valve 19 is connected to the valve under test, and the second proportional relief valve 19 can adjust the back pressure of the valve under test. At this time, the flow characteristics of the tested valve under different back pressure conditions can be detected.

When the third electromagnetic reversing valve 17 is de-energized and the electromagnetic reversing valve 18 is energized, the third electromagnetic reversing valve 17 , the fourth electromagnetic reversing valve 18 and the throttle valve 20 are connected. The throttle valve 20 is connected to the valve under test, and the throttle valve 20 can adjust the flow at the outlet end of the valve under test. At this time, the flow characteristics of the valve under test under different outlet flow conditions can be detected.

When the third electromagnetic reversing valve 17 is energized, the outlet of the valve under test, the third electromagnetic reversing valve 17 and the hydraulic motor 22 communicate with each other. The photoelectric encoder 21 is used to measure the rotation angle and rotational speed of the hydraulic motor 22 , and the torque sensor 23 is used to measure the output torque of the hydraulic motor 22 . When the electromagnetic clutch 24 is powered off, the hydraulic motor 22 is in the no-load state, and the pressure-flow characteristic of the valve to be measured under the no-load state can be measured; when the electromagnetic clutch 24 is powered on, the hydraulic motor 22 is connected to the flywheel set, and by adjusting the flywheel set The load of the hydraulic motor 22 can be changed to detect the pressure-flow characteristic of the valve under test under the influence of the load.

The temperature regulation part includes: an exhaust valve 16 , a liquid level gauge 15 , a second temperature sensor 14 , a cooler 25 , a heater 26 , a quantitative hydraulic pump 28 and a fifth electromagnetic reversing valve 27 . The liquid inlet of the quantitative hydraulic pump 28 is communicated with the oil tank 1, the liquid outlet of the quantitative hydraulic pump 28 is communicated with the liquid inlet of the fifth electromagnetic reversing valve 27, and the two liquid outlets of the fifth electromagnetic reversing valve 27 are respectively connected to The liquid inlet of the cooler 25 is communicated with the liquid inlet of the heater 26 , and the liquid outlet of the cooler 25 and the liquid outlet of the heater 26 are both communicated with the oil tank 1 . The second temperature sensor 14 is used for collecting the oil temperature in the oil tank 1 , the liquid level gauge 15 is used for calibrating the oil liquid level in the oil tank 1 , and the exhaust valve 16 is used for discharging the gas in the oil tank 1 .

In this embodiment, high and low temperature experiments can be carried out respectively. The quantitative hydraulic pump 28 is used to circulate the hydraulic oil in the oil tank 1. When the fifth electromagnetic reversing valve 27 is powered off, the quantitative hydraulic pump 28 is communicated with the cooler 25, so that the hydraulic oil When the fifth electromagnetic reversing valve 27 is energized, the quantitative hydraulic pump 28 is communicated with the heater 26, so that the hydraulic oil is heated, that is, the oil entering the valve under test is controlled by heating or cooling the hydraulic oil in the oil tank. temperature, and finally realize the function of temperature regulation.

Further, a filter 3 is provided on the passage between the quantitative hydraulic pump 28 and the oil tank 1 and the passage between the variable hydraulic pump 4 and the oil tank 1 . The first electromagnetic reversing valve 7 is a two-position four-way electromagnetic reversing valve, and the second electromagnetic reversing valve 8, the third electromagnetic reversing valve 17, the fourth electromagnetic reversing valve 18, and the fifth electromagnetic reversing valve 27 are all Two-position three-way electromagnetic reversing valve, pressure reducing valve 9 is a fixed-value pressure reducing valve.

Claims (10)

1. A hydraulic valve performance comprehensive testing system, characterized in that it comprises: a first proportional relief valve (2), a variable hydraulic pump (4), a first electromagnetic reversing valve (7), a second electromagnetic reversing valve (8), pressure reducing valve (9), speed regulating valve (10), third electromagnetic reversing valve (17), fourth electromagnetic reversing valve (18), second proportional relief valve (19), throttle a valve (20), a hydraulic motor (22), an electromagnetic clutch (24), a flywheel group and two detection groups; One end of the first proportional relief valve (2), the liquid inlet of the variable hydraulic pump (4), one end of the second proportional relief valve (19), one end of the throttle valve (20), and one end of the hydraulic motor (22) One end is connected with the fuel tank (1), The other end of the first proportional relief valve (2) is communicated with the liquid outlet of the variable hydraulic pump (4) and one end of the first electromagnetic reversing valve (7) at the same time, The other end of the first electromagnetic reversing valve (7) is communicated with the first port of the second electromagnetic reversing valve (8), The second port of the second electromagnetic reversing valve (8) communicates with one end of the pressure reducing valve (9), The third port of the second electromagnetic reversing valve (8) is communicated with one end of the speed regulating valve (10), The other end of the pressure reducing valve (9) and the other end of the speed regulating valve (10) communicate with one end of the valve under test at the same time, The other end of the valve under test is in communication with the first port of the third electromagnetic reversing valve (17), The second port of the third electromagnetic reversing valve (17) communicates with the first port of the fourth electromagnetic reversing valve (18), The second port of the fourth electromagnetic reversing valve (18) communicates with the other end of the second proportional relief valve (19), The third port of the third electromagnetic reversing valve (17) communicates with the other end of the hydraulic motor (22), The hydraulic motor (22) and the flywheel set are connected or disconnected through the electromagnetic clutch (24); Two sets of detection groups are located at both ends of the valve under test, and the two groups of detection groups are respectively used to detect the temperature, pressure and flow of the liquid at the two ports of the valve under test. 2. A hydraulic valve performance comprehensive testing system according to claim 1, further comprising: a cooler (25), a heater (26), a quantitative hydraulic pump (28) and a fifth electromagnetic reversing valve (27), The liquid inlet of the quantitative hydraulic pump (28) is communicated with the oil tank (1), The liquid outlet of the quantitative hydraulic pump (28) is communicated with the liquid inlet of the fifth electromagnetic reversing valve (27), The two liquid outlets of the fifth electromagnetic reversing valve (27) are respectively communicated with the liquid inlet of the cooler (25) and the liquid inlet of the heater (26), The liquid outlet of the cooler (25) and the liquid outlet of the heater (26) are both communicated with the oil tank (1). 3. A hydraulic valve performance comprehensive testing system according to claim 1 or 2, wherein the detection group comprises: a flow sensor (11), a first temperature sensor (12) and a pressure sensor (13), The flow sensor (11) is used for collecting the liquid flow at the location, the first temperature sensor (12) is used for collecting the liquid temperature at the location, and the pressure sensor (13) is used for collecting the liquid pressure at the location. 4. A hydraulic valve performance comprehensive testing system according to claim 1 or 2, characterized in that, a one-way valve (5) is provided on the path from the variable hydraulic pump (4) to the first electromagnetic reversing valve (7). ). 5. A hydraulic valve performance comprehensive testing system according to claim 1 or 2, characterized in that, a muffler (6) is provided on the passage between the variable hydraulic pump (4) and the first electromagnetic reversing valve (7). ). 6. A hydraulic valve performance comprehensive testing system according to claim 1 or 2, characterized in that it further comprises a frequency conversion motor for adjusting the flow adjustment range of the variable hydraulic pump (4). 7. A hydraulic valve performance comprehensive testing system according to claim 1 or 2, characterized in that, further comprising: a photoelectric code disc (21) and a torque sensor (23), The photoelectric code disc (21) is used to collect the rotation angle and rotational speed of the hydraulic motor (22), The torque sensor (23) is used for collecting the output torque of the hydraulic motor (22). 8. A hydraulic valve performance comprehensive testing system according to claim 2, characterized in that the passage between the quantitative hydraulic pump (28) and the oil tank (1), the variable hydraulic pump (4) and the oil tank (1) Filters (3) are arranged on the passages between them. 9. A hydraulic valve performance comprehensive testing system according to claim 2 or 8, characterized in that, further comprising: an exhaust valve (16), a liquid level gauge (15) and a second temperature sensor (14), The second temperature sensor (14) is used to collect the oil temperature in the oil tank (1), The liquid level gauge (15) is used to calibrate the oil level in the oil tank (1), The exhaust valve (16) is used to exhaust the gas in the fuel tank (1). 10. A hydraulic valve performance comprehensive testing system according to claim 2 or 8, characterized in that the first electromagnetic reversing valve (7) is a two-position four-way electromagnetic reversing valve, The second electromagnetic reversing valve (8), the third electromagnetic reversing valve (17), the fourth electromagnetic reversing valve (18), and the fifth electromagnetic reversing valve (27) are all two-position three-way electromagnetic reversing valves, The pressure reducing valve (9) is a fixed value pressure reducing valve.

Images