Hydraulic system and equipment for testing hydraulic valve

Abstract

The invention discloses a hydraulic system and equipment for testing a hydraulic valve, and belongs to the technical field of hydraulic systems. An oil inlet of the hydraulic pump is connected with the oil tank; the tested valve comprises a plurality of inlets and outlets; one oil way of an oil outlet of the hydraulic pump is connected with the pressure regulating oil way, and the other oil way is connected with an oil inlet of the cartridge check valve; the pressure adjusting oil way adjusts the oil outlet pressure of the hydraulic pump; one oil way inserted into the oil outlet of the one-way valve is connected with a control oil way; the control oil way is used for adjusting the on-off and pressure of control oil of the tested valve; the other oil way is connected with an oil inlet of a proportional speed regulating valve, an oil outlet of the proportional speed regulating valve is connected with an oil inlet of a plug-in mounting type direction valve group, an oil outlet of the plug-in mounting type direction valve group is connected with an inlet of a tested valve, and a control cavity of the plug-in mounting type direction valve group is connected with an electromagnetic directional valve; an outlet of the tested valve is connected with the hydraulic cylinder and the throttling oil way. The hydraulic valve testing device can be suitable for testing high-pressure environments of various types of hydraulic valves.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic systems, and in particular to a hydraulic system and equipment for testing hydraulic valves. Background Art

[0002] With the development of modern industry, hydraulic technology plays an increasingly important role in various industries. Due to the increasing complexity of the composition and functions of hydraulic systems and the increasing requirements for equipment reliability, as well as the diversity, complexity, and concealment of hydraulic equipment failures, it is often necessary to perform performance tests on hydraulic valve components when diagnosing hydraulic system failures or predicting the quality and performance of components for the purpose of use.

[0003] As the control and adjustment components of the hydraulic system, hydraulic valves include various directional valves, pressure valves, and flow valves, which have different structures, principles, models, and types. When performing parameter performance tests, since different types and models of hydraulic valves have different pressure, flow, load, and performance requirements, if a test system and equipment are used for each type of valve, the equipment utilization rate will be low, the production cost will be greatly increased, and it is easy to cause repeated procurement and construction.

[0004] In view of the above situation, in the prior art, a Chinese patent document with publication number CN109827767A discloses a hydraulic valve automatic test bench, including: a first oil circuit node and a second oil circuit node; a third oil circuit node; a first pressure limiting valve; a second pressure limiting valve; an unloading passage; a loading passage; a two-way cartridge valve; a cover plate; a proportional pressure regulating valve; a first gas-controlled reversing valve; a second gas-controlled reversing valve; a base oil circuit block, a lower transition block is superimposed on the base oil circuit block; an upper pressure plate oil circuit block, an upper transition block is superimposed on the lower part of the upper pressure plate oil circuit block; a test valve, the test valve is respectively adapted to the internal channels of the upper transition block and the lower transition block; an upper oil circuit conversion block, the upper oil circuit conversion block is connected with the upper pressure plate oil circuit block; a clamping oil cylinder, the clamping oil cylinder is connected with the test valve. Another example is a Chinese patent document with publication number CN107387502A discloses a comprehensive test system and method for a valve body, in which a proportional test valve is used, which can also adjust the flow.

[0005] However, during operation, the hydraulic test system needs to have a fast response, large flow capacity, small leakage, the ability to meet various performance test requirements, and continuously adjustable parameters. The above-mentioned test bench, such as patent CN109827767A, is only a pneumatic clamping system device used to clamp the test valve and reduce labor intensity, and is not a hydraulic system device for testing the performance parameters of hydraulic valves; patent CN107387502A is used to test some performance parameters of solenoid valves, proportional valves, and cartridge valves, but the system uses non-cartridge valve technology, the overall system has large leakage, small flow capacity, and insufficient response speed to cope with high-pressure scenarios of rapid opening and closing, and the types of test valves are limited, the test flow and pressure cannot be adjusted proportionally and continuously, and it is difficult to adapt to the requirements of high-pressure testing of various types of hydraulic valves. Summary of the invention

[0006] The purpose of the present invention is to provide a hydraulic system and equipment for hydraulic valve testing, so as to solve the problems in the prior art that the response speed of the hydraulic system is not enough to cope with rapid opening and closing, leakage affects the test accuracy, the flow capacity limits the specifications of the test valve, the test flow and pressure cannot be proportionally and continuously adjusted, and it is difficult to adapt to high-pressure testing of various types of hydraulic valves.

[0007] In order to achieve the above-mentioned object, the present invention provides a hydraulic system for testing a hydraulic valve, comprising: an oil tank; a hydraulic pump, whose oil inlet is connected to the oil tank; a test valve, wherein the test valve comprises a plurality of inlets and outlets; the oil outlet of the hydraulic pump is divided into two oil circuits, wherein one oil circuit is connected to a pressure regulating oil circuit, and the other oil circuit is connected to an oil inlet of a plug-in check valve; the pressure regulating oil circuit adjusts the oil outlet pressure of the hydraulic pump;

[0008] The oil outlet of the cartridge check valve is divided into two oil circuits, one of which is connected to the control oil circuit, and the control oil circuit adjusts the control oil on / off and pressure of the tested valve; the other oil circuit is connected to the oil inlet of the proportional speed regulating valve, and the oil outlet of the proportional speed regulating valve is connected to the oil inlet of the cartridge directional valve group, and the oil outlet of the cartridge directional valve group is connected to the inlet and return oil circuit of the tested valve, and the control chamber of the cartridge directional valve group is connected to the electromagnetic reversing valve;

[0009] The outlet of the tested valve is connected to a hydraulic cylinder and a throttling oil circuit respectively, and the hydraulic cylinder and the throttling oil circuit are loaded when testing the performance parameters of the tested valve.

[0010] Furthermore, the cartridge directional valve group includes a first cartridge directional valve, a second cartridge directional valve, a third cartridge directional valve and a fourth cartridge directional valve, the proportional speed control valve divides into two branches which are respectively connected to the oil inlets of the second cartridge directional valve and the third cartridge directional valve, the oil outlets of the second cartridge directional valve and the third cartridge directional valve are respectively connected to the oil inlet and return ports of the test valve; the second cartridge directional valve is connected to the control chamber of the fourth cartridge directional valve and is connected to an oil outlet of the electromagnetic reversing valve, the third cartridge directional valve is connected to the control chamber of the first cartridge directional valve and is connected to another oil outlet of the electromagnetic reversing valve; the oil outlets of the first cartridge directional valve and the fourth cartridge directional valve merge into the return oil circuit and are connected to the oil tank.

[0011] Furthermore, a cooler and a filter are connected to the return oil circuit.

[0012] Furthermore, the pressure regulating oil circuit includes a cartridge pressure valve, a reversing valve and a proportional pressure regulating valve, the control chamber of the cartridge pressure valve is connected to the oil inlet of the reversing valve, and the oil return port of the reversing valve is connected to the oil tank; the working port of the reversing valve is connected to the oil inlet of the proportional pressure regulating valve, and the oil return port of the proportional pressure regulating valve is connected to the oil tank.

[0013] Furthermore, the control oil circuit includes a cartridge-type pressure reducing valve, a pressure regulating valve and a pressure collection device, the oil inlet of the cartridge-type pressure reducing valve is connected to the outlet of the cartridge-type check valve, the control chamber of the cartridge-type pressure reducing valve is connected to the pressure regulating valve, the oil outlet of the cartridge-type pressure reducing valve is connected to the control oil port of the test valve, and a pressure collection device is provided on the oil outlet circuit of the cartridge-type pressure reducing valve.

[0014] Furthermore, the throttling oil circuit includes a throttle valve and a two-position two-way valve, the oil inlet of the throttle valve is connected to the outlet of the test valve, the oil outlet of the throttle valve is connected to the oil inlet of the two-position two-way valve, and the oil return port of the two-position two-way valve is connected to the pressure collection device and the oil tank; the oil inlet of the throttle valve is provided with a flow meter and a stop valve.

[0015] Furthermore, the oil outlet of the hydraulic pump and each inlet and outlet of the tested valve are provided with a pressure collection device.

[0016] Furthermore, the oil inlet and return ports of the tested valve and the oil port of the rodless chamber of the hydraulic cylinder are all provided with flow meters and stop valves, and another oil return port of the tested valve is provided with a stop valve and connected to the oil tank.

[0017] The present invention also proposes a hydraulic device for testing hydraulic valves, including a machine platform and the above-mentioned hydraulic system, wherein the machine platform is equipped with a test oil circuit integrated module, a control oil circuit integrated module and a hydraulic cylinder, and the three are connected by an oil pressure pipeline; the test oil circuit integrated module controls the operation of the plug-in directional valve group, and the control oil circuit integrated module controls the operation of the control oil circuit.

[0018] Furthermore, the machine is equipped with a liquid level and liquid temperature gauge, an oil tank, a liquid level control relay and an air filter. The liquid level and liquid temperature gauge is installed on the outside of the oil tank, and the liquid level control relay and the air filter are connected to the oil tank.

[0019] Compared with the existing known technology, the technical solution provided by the present invention has the following beneficial effects:

[0020] The invention discloses a hydraulic system for testing a hydraulic valve. The inlet of the tested valve is connected to a cartridge directional valve group. The control chamber of the cartridge directional valve group is connected to an electromagnetic reversing valve. The electromagnetic reversing valve changes the flow direction of the oil circuit by controlling the opening and closing of the cartridge directional valve group, thereby changing the oil inlet and return direction of the tested valve. Similarly, the pressure regulating oil circuit can regulate the oil outlet pressure of the hydraulic pump, that is, the oil inlet pressure of the tested valve. The hydraulic cylinder and the throttling oil circuit independently regulate the corresponding outlet pressure of the tested valve, and play a loading role when testing the performance parameters of the tested valve. Through the electro-hydraulic proportional technology of the proportional valve, the parameters such as pressure and flow required for the test can be adjusted continuously, conveniently and accurately. The cartridge valve technology of the cartridge check valve and the cartridge directional valve group has small leakage, sensitive action, fast response, strong anti-pollution ability, and more accurate testing. It is suitable for fast opening and closing and high-pressure hydraulic systems, meets the performance test and accuracy requirements, and can test various types of hydraulic valves. The detection accuracy meets the national standard and is easy to operate.

[0021] It will be apparent that elements or features described above in the context of a single embodiment may be used alone or in combination in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the drawings, the sizes and proportions do not represent the sizes and proportions of actual products. The drawings are merely illustrative, and some non-essential elements or features are omitted for clarity.

[0023] Figure 1 is a schematic diagram of a hydraulic system in an embodiment of the present invention;

[0024] Figure 2 is a schematic diagram of the assembly structure of the hydraulic equipment in an embodiment of the present invention;

[0025] Figure 3 1 is a schematic diagram of the assembly structure of the test valve in the embodiment of the present invention (I);

[0026] Figure 4Schematic diagram of the assembly structure of the test valve in the embodiment of the present invention (II);

[0027] Figure 5 It is a pressure difference-flow characteristic curve diagram for each flow direction obtained by testing the two-position four-way reversing valve in an embodiment of the present invention.

[0028] Description of Reference Numerals

[0029] 100. Machine;

[0030] 1. Liquid level and temperature gauge; 2. Fuel tank; 3. Liquid level control relay; 4. Air filter; 5. Hydraulic pump; 6. Proportional pressure regulating valve; 7. Reversing valve; 8. Filter; 9. Cooler; 10. Cartridge pressure valve; 11. Cartridge check valve; 12. Proportional speed regulating valve; 13. Pressure collection device; 14. Cartridge pressure reducing valve; 15. Pressure regulating valve; 16. Flow meter; 17. Cartridge directional valve group; 171. First cartridge directional valve; 172. Second cartridge directional valve; 173. The third cartridge directional valve; 174, the fourth cartridge directional valve; 18, the solenoid reversing valve; 19, the stop valve; 20, the test valve; 21, the hydraulic cylinder; 22, the throttle valve; 23, the two-position two-way valve; 24, the return oil circuit; 25, the test oil circuit integrated module; 26, the base block; 261, the bolt; 262, the channel; 27, the installation base plate; 28, the base block inlet and return oil pipes; 29, the control oil inlet pipe; 30, the control oil outlet pipe; 31, the hydraulic cylinder oil pipe; 32, the control oil circuit integrated module. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below with reference to the accompanying drawings. What is described here is only a preferred embodiment of the present invention, and those skilled in the art can think of other ways to implement the present invention based on the preferred embodiment, and other ways also fall within the scope of the present invention.

[0032] Example

[0033] Reference Figure 1-Figure 4The present embodiment provides a hydraulic system for testing a hydraulic valve, comprising: an oil tank 2, in which hydraulic oil is contained; a hydraulic pump 5, whose oil inlet is connected to the oil tank 2, and the hydraulic pump 5 is a power mechanism for outputting hydraulic oil; a test valve 20, which comprises a plurality of inlets and outlets; the oil outlet of the hydraulic pump 5 is divided into two oil circuits, one of which is connected to a pressure regulating oil circuit, and the other is connected to an oil inlet of an inserted check valve 11; the pressure regulating oil circuit adjusts the oil outlet pressure of the hydraulic pump 5; the oil outlet of the inserted check valve 11 is divided into two oil circuits, one of which is connected to a pressure regulating oil circuit, and the other is connected to an oil inlet of an inserted check valve 11; the pressure regulating oil circuit adjusts the oil outlet pressure of the hydraulic pump 5; the oil outlet of the inserted check valve 11 is divided into two oil circuits, one of which is connected to a pressure regulating oil circuit. The control oil circuit is connected, and the control oil circuit adjusts the control oil on-off and pressure of the test valve 20; another oil circuit is connected to the oil inlet of the proportional speed control valve 12, and the oil outlet of the proportional speed control valve 12 is connected to the oil inlet of the plug-in directional valve group 17, and the oil outlet of the plug-in directional valve group 17 is connected to the inlet of the test valve 20 and the return oil circuit 24, and the control chamber of the plug-in directional valve group 17 is connected to the electromagnetic reversing valve 18; the outlet of the test valve 20 is respectively connected to the hydraulic cylinder 21 and the throttling oil circuit, and the hydraulic cylinder 21 and the throttling oil circuit play a loading role when testing the performance parameters of the test valve.

[0034] Among them, the inlet of the test valve 20 is connected to the plug-in directional valve group 17, and the control chamber of the plug-in directional valve group 17 is connected to the electromagnetic reversing valve 18. The electromagnetic reversing valve 18 changes the flow direction of the oil circuit by controlling the opening and closing of the plug-in directional valve group 17, thereby changing the oil inlet and return direction of the test valve 20. Similarly, the pressure regulating oil circuit can regulate the oil outlet pressure of the hydraulic pump 5, that is, the oil inlet pressure of the test valve 20. The hydraulic cylinder 21 and the throttling oil circuit independently adjust the corresponding outlet pressure of the test valve 20, and play a loading role when testing the performance parameters of the test valve 20. Through the electro-hydraulic proportional technology of the proportional pressure regulating valve 6 and the proportional speed regulating valve 12, the pressure, flow and other parameters required for the test can be adjusted proportionally, continuously, conveniently and accurately. The cartridge valve technology of the cartridge check valve 11 and the cartridge directional valve group 17 is adopted, which has small leakage, sensitive action, fast response, strong anti-pollution ability, and more accurate testing. It is suitable for fast opening and closing and high-pressure hydraulic systems, meets the performance test requirements, and can test various types of hydraulic valves. The detection accuracy meets the national standards and is easy to operate.

[0035] Specifically, Figure 1As shown, the cartridge directional valve group 17 includes a first cartridge directional valve 171, a second cartridge directional valve 172, a third cartridge directional valve 173 and a fourth cartridge directional valve 174, the proportional speed regulating valve 12 is divided into two branches respectively connected to the oil inlets of the second cartridge directional valve 172 and the third cartridge directional valve 173, the oil outlets of the second cartridge directional valve 172 and the third cartridge directional valve 173 are respectively connected to the oil inlet and return ports of the test valve 20; the second cartridge directional valve 17 2 is connected to the control chamber of the fourth cartridge directional valve 174 and is connected to an oil outlet of the electromagnetic reversing valve 18, the third cartridge directional valve 173 is connected to the control chamber of the first cartridge directional valve 171 and is connected to another oil outlet of the electromagnetic reversing valve 18; the oil outlets of the first cartridge directional valve 171 and the fourth cartridge directional valve 174 merge into the return oil circuit 24 and are connected to the oil tank 2, and the first cartridge directional valve 171 and the fourth cartridge directional valve 174 play the role of opening and closing the oil circuit to the oil tank 2.

[0036] It should be noted that the return oil circuit 24 is connected with a cooler 9 and a filter 8. The cooler 9 reduces the oil temperature of the hydraulic oil in the return oil circuit 24 to the working temperature to ensure that the main engine can continue to operate normally and work smoothly. The filter 8 can filter the impurities generated by the hydraulic oil during the flow process, intercept the pollutants in the oil, keep the oil clean, and ensure the normal operation of the oil system.

[0037] Furthermore, the pressure regulating oil circuit includes a cartridge pressure valve 10, a reversing valve 7 and a proportional pressure regulating valve 6. The control chamber of the cartridge pressure valve 10 is connected to the oil inlet of the reversing valve 7, and the oil return port of the reversing valve 7 is connected to the oil tank 2; the working port of the reversing valve 7 is connected to the oil inlet of the proportional pressure regulating valve 6, and the oil return port of the proportional pressure regulating valve 6 is connected to the oil tank 2. When the control chamber of the cartridge pressure valve 10 is switched by the reversing valve 7 and connected to the oil tank 2, the hydraulic pump 5 can be started without load; when connected to the proportional pressure regulating valve 6, the oil outlet pressure of the hydraulic pump 5 can be adjusted proportionally and continuously.

[0038] The control oil pressure of the test valve 20 is adjusted through the control oil circuit. Specifically, the control oil circuit includes a cartridge pressure reducing valve 14, a pressure regulating valve 15 and a pressure collection device 13. The oil inlet of the cartridge pressure reducing valve 14 is connected to the outlet of the cartridge check valve 11, the control chamber of the cartridge pressure reducing valve 14 is connected to the inlet of the pressure regulating valve 15, the oil outlet of the cartridge pressure reducing valve 14 is connected to the control oil port of the test valve 20, and a pressure collection device 13 is provided on the oil outlet of the cartridge pressure reducing valve 14. The outlet pressure of the cartridge pressure reducing valve 14 is adjusted by the pressure regulating valve 15. It should be noted that the pressure collection device 13 usually adopts a pressure gauge, and in transient testing, the pressure collection device 13 should adopt a high-frequency response pressure sensor.

[0039] The throttling oil circuit includes a throttle valve 22 and a two-position two-way valve 23. The oil inlet of the throttle valve 22 is connected to the outlet of the test valve 20, the oil outlet of the throttle valve 22 is connected to the oil inlet of the two-position two-way valve 23, and the oil return port of the two-position two-way valve 23 is connected to the pressure collection device 13 and the oil tank 2. The throttle valve 22 and the two-position two-way valve 23 form a circuit, which has the functions of throttling speed regulation and opening and closing the oil circuit. It can be understood that the oil outlet of the hydraulic pump 5 and each inlet and outlet of the test valve 20 are provided with a pressure collection device 13, and the pressure collection device 13 can timely measure the size of the pressure, clarify the test parameters, and improve the accuracy of the test results. In addition, the oil inlet and return ports of the test valve 20, the rodless chamber oil port of the hydraulic cylinder 21, and the oil inlet of the throttle valve 22 are all provided with a flow meter 16 and a stop valve 19, and another oil return port of the test valve 20 is provided with a stop valve 19 and connected to the oil tank 2. The stop valve 19 can cut off the oil circuit at any time, which is convenient for disassembly, assembly and replacement of different types of test valves 20. The flow meter 16 is convenient for measuring the flow rate of the test.

[0040] In some embodiments of the present application, Figure 1 , the specific operating steps for various hydraulic valve tests are as follows:

[0041] During the pressure test, a pressure test pressure of 1.5 times the maximum working pressure is applied to each pressure-bearing oil port. The pressure is adjusted by the proportional pressure regulating valve 6 and maintained for 5 minutes. It is observed that there is no external leakage. During the pressure test, each oil drain port is connected to the oil tank 2. When testing the "force" required for adjusting the control component, the adjustment setting value of the control component is changed under each group of inlet and outlet pressure or flow setting values, and the corresponding adjustment "force" is measured.

[0042] When the tested valve 20 is a flow control valve:

[0043] When testing the steady-state flow-pressure characteristics, for pressure-compensated valves, at the specified increments of inlet and outlet pressures, the inlet pressure is adjusted by the proportional pressure-regulating valve 6, the outlet pressure is generated by the test hydraulic cylinder 21, the flow is adjusted by the proportional speed-regulating valve 12 and read by the flowmeter 16, and the specified pressure and flow are tested from the minimum to the maximum value. For valves without pressure compensation, the pressure difference is read by the pressure gauges before and after the valve, and the flow is read by the flowmeter 16; when testing the external leakage, for flow valves with external leakage ports, the difference between the inlet flow and the outlet flow of the test valve 20 is read by two flowmeters 16, which is the external leakage; when testing the transient characteristics of a flow valve with pressure compensation, the outlet pressure step is caused by suddenly starting and stopping the test hydraulic cylinder 21 or the inlet pressure step is caused by the on-off plug-in directional valve group 17, and the flow-time related characteristics are tested.

[0044] When the tested valve 20 is a diverter valve:

[0045] The two diversion outlets of the tested diverter valve are connected to the test hydraulic cylinder 21 on one side and to the throttle valve 22 circuit on the other side. When testing the steady-state flow-pressure characteristics, the pressures of the two outlets of the diverter valve are respectively adjusted by the test hydraulic cylinder 21 and the valve 22. The inlet and outlet pressure difference of the tested diverter valve is read by the pressure gauge, and the diversion flow is obtained by the flow meter 16. The inlet pressure and outlet flow are tested at each inlet flow. When testing the transient characteristics, the outlet pressure step of each diversion port is caused by suddenly starting and stopping the test hydraulic cylinder 21 or the two-position two-way valve 23, and the time-related characteristics of each diversion flow are tested.

[0046] When the tested valve 20 is a relief valve:

[0047] When testing the steady-state pressure-flow characteristic, the test valve 20 is adjusted to the required flow and pressure value, and the pressure is read by the pressure gauge in front of the valve. At each test pressure value, the flow is changed back and forth from zero to the maximum value. The flow is adjusted by the proportional speed regulating valve 12 and read by the flow meter 16. The inlet pressure of the test valve 20 is tested. The outlet pressure of the test valve 20 can be atmospheric pressure or a certain required pressure value; when testing the flow step pressure response characteristic, the test valve 20 is adjusted to the required flow and pressure, and the proportional speed regulating valve 12 is operated to make the flow change from zero to the test flow, and the pressure response at the inlet of the test valve 20 is tested; when testing the pressure relief and pressure building characteristics, when the valve is a pilot control type, the test valve 20 is unloaded by the plug-in pressure reducing valve 14 and the pressure regulating valve 15 in the control oil circuit, and the minimum working pressure at each flow rate and the time required for pressure relief and the time to re-establish the control pressure are tested point by point through the pressure gauge.

[0048] When the tested valve 20 is a pressure reducing valve:

[0049] When testing the steady-state pressure-flow characteristic, the valves are set to the required flow and outlet pressure values ​​through the pressure gauges at the outlets of the proportional speed regulating valve 12 and the test valve 20, and then the flow is adjusted to change back and forth from zero to the maximum value to test the outlet pressure value of the test valve 20; when testing the inlet pressure step response characteristic, the proportional pressure regulating valve 6 is adjusted to make the inlet pressure of the test valve 20 the required value, and then the proportional speed regulating valve 12 and the test valve 20 are adjusted to make the flow and outlet pressure at the required values, and then the proportional pressure regulating valve 6 is operated to drop the system pressure to a starting pressure not greater than 20% of the final steady-state pressure value, and then the pressure is quickly increased to the original required pressure value to generate a pressure gradient in the oil inlet circuit to test the test valve. Test the pressure response at the inlet of the test valve 20; when testing the step pressure response characteristics of the outlet flow, adjust the proportional pressure regulating valve 6 so that the inlet pressure of the test valve is the required value, and then adjust the proportional speed regulating valve 12 and the test valve 20 so that the flow and outlet pressure are at the required values, then stop the test hydraulic cylinder 21 to make the flow zero, and then start the test hydraulic cylinder 21 to its original state to test the pressure response of the outlet of the test valve 20; when testing the pressure relief and pressure building characteristics, when the valve is a pilot control type, the test valve 20 is unloaded by controlling the plug-in pressure reducing valve 14 and the pressure regulating valve 15 in the oil circuit, and test the minimum working pressure at each flow rate, the time required for pressure relief and the time to re-establish the pressure value point by point.

[0050] When the tested valve 20 is a solenoid reversing valve:

[0051] When testing the steady-state differential pressure-flow characteristics, the differential pressure is read by the pressure gauges before and after the valve, and the flow rate is read by the flow meter 16; when testing the internal leakage, the test hydraulic cylinder 21 is stopped, and when the oil inlet and return ports of the test valve 20 are in a non-conducting state, the reading of the flow meter 16 on the oil return line is tested, that is, the leakage flow; when testing the transient response, after adjusting the test pressure and flow, the control voltage of the electromagnet of the test valve 20 is turned on or off, and the pressure change response of the output port of the test valve 20 is tested by the pressure gauge behind the valve.

[0052] When the test valve 20 is an electro-hydraulic reversing valve, a hydraulic reversing valve, a manual reversing valve, or a motorized reversing valve, the method for testing the steady-state differential pressure-flow characteristics and internal leakage is the same as that of the electromagnetic reversing valve. When testing the minimum control force during normal reversing, adjust the proportional pressure regulating valve 6 and the test hydraulic cylinder 21 so that the indicated pressure of the pressure gauge is the nominal pressure, adjust the proportional speed regulating valve 12, and test the minimum control pressure or minimum control force of the test valve 20 when passing different flow rates; when testing transient response, adjust the proportional pressure regulating valve 6, the pressure regulating valve 15, and the test hydraulic cylinder 21 so that the indicated pressure of the pressure gauge is the nominal pressure, the flow rate is the nominal flow, the test valve 20 is reversed, the valve core displacement or the response of the output pressure is recorded, and the lag time and response time are determined.

[0053] When the tested valve 20 is a one-way valve:

[0054] When testing the steady-state differential pressure-flow characteristic, the differential pressure is read by the pressure gauges before and after the valve, and the flow rate is read by the flowmeter 16; when testing the minimum opening pressure of the direct-acting one-way valve, when the outlet pressure of the test valve 20 is atmospheric pressure, the inlet pressure is gradually increased from zero until oil flows out of the outlet, and the pressure value at this time is recorded by the pressure gauge; when testing the minimum control pressure of the hydraulically controlled one-way valve for reverse opening, the pressure regulating valve 15 in the control oil circuit can be adjusted to gradually increase the control oil pressure from zero until the flow through the test valve 20 in the reverse direction reaches the required flow value, and then the pressure regulating valve 15 is adjusted to gradually reduce the control oil pressure to test the closing pressure; when testing the leakage, the test valve 20 is installed in reverse so that its A port is under atmospheric pressure and its B port is connected to oil of a specified pressure value, and the leakage is tested within a certain time interval.

[0055] Another aspect of the present application provides a hydraulic device for testing a hydraulic valve, such as Figure 2 As shown, it includes a machine 100 and the above-mentioned hydraulic system, and the hydraulic system is assembled on the hydraulic equipment. The machine 100 is equipped with a test oil circuit integrated module 25, a control oil circuit integrated module 32 and a hydraulic cylinder 21, and the three are connected by a hydraulic pipeline; the test oil circuit integrated module 25 controls the operation of the cartridge directional valve group 17, and the control oil circuit integrated module 32 controls the operation of the control oil circuit. The hydraulic equipment of the present application can accurately adjust the pressure, flow, load and other parameters required for the test, and the cartridge valve technology has the advantages of small leakage, sensitive action, fast response, etc., the test is more accurate, suitable for fast opening and closing and high-pressure hydraulic systems, meets the performance test requirements, and can test various types of hydraulic valves.

[0056] It can be understood that the machine 100 is equipped with a liquid level and temperature meter 1, an oil tank 2, a liquid level control relay 3 and an air filter 4, the liquid level and temperature meter 1 is installed on the outside of the oil tank 2, and the liquid level control relay 3 and the air filter 4 are installed on the upper cover of the oil tank 2. The liquid level and temperature meter 1 and the liquid level control relay 3 can control the liquid level and the oil temperature.

[0057] The overall design of the hydraulic system and its main technical parameters are shown in Table 1.

[0058] Table 1 Technical design parameters of the test system

[0059] name parameter Work Pressure 24Mpa Maximum test pressure 31.5MPa Test flow 120L / min Motor power 75KW Fuel tank capacity 1000L Working medium YB-N46 hydraulic oil Oil filter accuracy Not less than 15μm Instrument measurement accuracy level No less than B grade Medium operating temperature 15℃～45℃

[0060] Parameter calculation

[0061] (1) Design pressure of hydraulic system components

[0062] The working pressure of the test system is 24Mpa. Considering overload and pressure resistance tests, the maximum test pressure is 31.5MPa.

[0063] (2) Maximum flow of hydraulic system

[0064] Considering the flow range of the test valve 20, the test flow rate is 120L / min.

[0065] Overall circuit design

[0066] Figure 1 The schematic diagram of the hydraulic system of the embodiment of the present invention is shown in FIG. The system adopts cartridge valve technology and electro-hydraulic proportional technology. The cartridge valve has small leakage, sensitive action, fast response, and strong anti-pollution ability, so the test is more accurate and suitable for fast opening and closing and high-pressure hydraulic systems. The electro-hydraulic proportional technology can adjust the pressure, flow, load and other parameters required for the test in a continuous, convenient and accurate manner to meet the performance test requirements, and can test various types of hydraulic valves. The detection accuracy meets the national standard and is easy to operate.

[0067] Selection of main components

[0068] According to the above parameters, the main components are selected.

[0069] (1) Hydraulic pump

[0070] Due to the high system pressure, a swash plate axial piston pump is selected. The pump model is A4VSO125MA, with a displacement of 125ml / r, a nominal pressure of 35MPa, and a volumetric efficiency of η pv =0.95, at a speed of 1480r / min, the pump flow rate Q = 125×10 -3 ×1480×0.95=175.75L / min≥120L / min, meeting system requirements.

[0071] (2) Drive motor

[0072] The design working pressure of this test bench is 24MPa, the test flow rate is 120L / min, the leakage coefficient along the way is 1.1, and the pressure loss ΔP=0.6MPa, so the maximum output power of the pump is

[0073]

[0074] Take the pump efficiency η p =0.84, then the required motor power is

[0075]

[0076] Check the motor product sample and select the Y2-280S-4 motor with a rated power of 75KW and a speed of n=1480r / min.

[0077] (3) Proportional valve and cartridge valve

[0078] The selected proportional valves and cartridge valves are shown in Table 2.

[0079] Table 2 Proportional valve and cartridge valve models

[0080]

[0081] (4) Other hydraulic components

[0082] According to the system pressure and flow, other hydraulic components are selected as shown in Table 3.

[0083] Table 3 Other hydraulic components

[0084]

[0085]

[0086] Test bench structure design

[0087] Figure 2 The assembly diagram of the system is shown in Figure 1. Figure 3 and Figure 4 The figure is a schematic diagram of the assembly of the test valve 20. The hydraulic system adopts an open system and integrated configuration. The hydraulic components are installed on the integrated block and the cartridge valve technology is used. It is arranged on the test bench 100. The test valve 20 is installed and fastened on the mounting base plate 27 for testing. The oil pump motor unit is arranged at the bottom of the machine 100. The hydraulic cylinder 21, the pressure collection device 13, and the flow meter 16 are arranged on the machine 100. The electrical devices are arranged inside the machine 100. Figure 3 As shown, the test valve 20 is fastened to the mounting base plate 27. Different types of test valves 20 have matching mounting base plates 27, which are fixed to the base block 26 with bolts 261. The base block 26 has a hole 262 processed inside, which is connected to the outside through the oil pipe and the stop valve 19, so as to facilitate the disassembly, assembly and replacement of different types of test valves 20. Specifically, the oil pipe includes a base block inlet and return oil pipe 28, which is used to connect the plug-in directional valve group 17; a control oil inlet pipe 29 and a control oil outlet pipe 30; and a hydraulic cylinder oil pipe 31, which is used to connect the hydraulic cylinder 21.

[0088] Figure 5 It is a schematic diagram of test results of an embodiment of the present application, specifically, a pressure difference-flow characteristic curve for each flow direction obtained by testing a two-position four-way reversing valve.

[0089] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "front", "rear", "left", "right", "up", "down", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0090] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0091] The protection scope of the present invention is limited only by the claims. With the help of the teachings of the present invention, those skilled in the art will easily recognize that alternative structures of the structures disclosed in the present invention can be used as feasible alternative embodiments, and the embodiments disclosed in the present invention can be combined to generate new embodiments, which also fall within the scope of the appended claims.

Claims

1. A hydraulic system for testing a hydraulic valve, comprising: Fuel tank (2); A hydraulic pump (5), the oil inlet of which is connected to the oil tank (2); A test valve (20), wherein the test valve (20) comprises a plurality of inlets and outlets; The invention is characterized in that the oil outlet of the hydraulic pump (5) is divided into two oil circuits, one of which is connected to the pressure regulating oil circuit, and the other is connected to the oil inlet of the plug-in check valve (11); the pressure regulating oil circuit adjusts the oil outlet pressure of the hydraulic pump (5); The oil outlet of the cartridge check valve (11) is divided into two oil circuits, one of which is connected to a control oil circuit, and the control oil circuit adjusts the on-off and pressure of the control oil of the test valve (20); the other oil circuit is connected to the oil inlet of the proportional speed regulating valve (12), the oil outlet of the proportional speed regulating valve (12) is connected to the oil inlet of the cartridge directional valve group (17), the oil outlet of the cartridge directional valve group (17) is connected to the inlet of the test valve (20) and the return oil circuit (24), and the control chamber of the cartridge directional valve group (17) is connected to the electromagnetic reversing valve (18); The outlet of the test valve (20) is respectively connected to a hydraulic cylinder (21) and a throttling oil circuit, and the hydraulic cylinder (21) and the throttling oil circuit are loaded when testing the performance parameters of the test valve (20).

2. A hydraulic system for testing a hydraulic valve according to claim 1, characterized in that: The cartridge directional valve group (17) comprises a first cartridge directional valve (171), a second cartridge directional valve (172), a third cartridge directional valve (173) and a fourth cartridge directional valve (174); the proportional speed regulating valve (12) branches into two branches respectively connected to the oil inlets of the second cartridge directional valve (172) and the third cartridge directional valve (173); the oil outlets of the second cartridge directional valve (172) and the third cartridge directional valve (173) are respectively connected to the inlet and outlet ports of the test valve (20). The second cartridge directional valve (172) is connected to the control chamber of the fourth cartridge directional valve (174) and is connected to an oil outlet of the electromagnetic reversing valve (18); the third cartridge directional valve (173) is connected to the control chamber of the first cartridge directional valve (171) and is connected to another oil outlet of the electromagnetic reversing valve (18); the oil outlets of the first cartridge directional valve (171) and the fourth cartridge directional valve (174) merge into the return oil circuit (24) and are connected to the oil tank (2).

3. A hydraulic system for testing a hydraulic valve according to claim 2, characterized in that: The return oil circuit (24) is connected to a cooler (9) and a filter (8).

4. A hydraulic system for testing a hydraulic valve according to claim 1, characterized in that: The pressure regulating oil circuit comprises a cartridge pressure valve (10), a reversing valve (7) and a proportional pressure regulating valve (6); the control chamber of the cartridge pressure valve (10) is connected to the oil inlet of the reversing valve (7), and the oil return port of the reversing valve (7) is connected to the oil tank (2); the working port of the reversing valve (7) is connected to the oil inlet of the proportional pressure regulating valve (6), and the oil return port of the proportional pressure regulating valve (6) is connected to the oil tank (2).

5. A hydraulic system for testing a hydraulic valve according to claim 1, characterized in that: The control oil circuit comprises a cartridge-type pressure reducing valve (14), a pressure regulating valve (15) and a pressure collection device (13); the oil inlet of the cartridge-type pressure reducing valve (14) is connected to the outlet of the cartridge-type check valve (11); the control chamber of the cartridge-type pressure reducing valve (14) is connected to the inlet of the pressure regulating valve (15); the oil outlet of the cartridge-type pressure reducing valve (14) is connected to the control oil outlet of the test valve (20); and the pressure collection device (13) is provided on the oil outlet circuit of the cartridge-type pressure reducing valve (14).

6. A hydraulic system for testing a hydraulic valve according to claim 1, characterized in that: The throttling oil circuit comprises a throttling valve (22) and a two-position two-way valve (23); the oil inlet of the throttling valve (22) is connected to the outlet of the test valve (20); the oil outlet of the throttling valve (22) is connected to the oil inlet of the two-position two-way valve (23); the oil return port of the two-position two-way valve (23) is connected to the pressure collection device (13) and the oil tank (2); the oil inlet of the throttling valve (22) is provided with a flow meter (16) and a stop valve (19).

7. A hydraulic system for testing a hydraulic valve according to claim 1, characterized in that: The oil outlet of the hydraulic pump (5) and each inlet and outlet of the test valve (20) are provided with a pressure collection device (13).

8. A hydraulic system for testing a hydraulic valve according to claim 1, characterized in that: The oil inlet and return ports of the test valve (20) and the rodless chamber oil port of the hydraulic cylinder (21) are all provided with a flow meter (16) and a stop valve (19), and the other oil return port of the test valve (20) is provided with a stop valve (19) and connected to the oil tank (2).

9. A hydraulic device for testing a hydraulic valve, characterized in that: The invention comprises a machine (100) and a hydraulic system according to any one of claims 1 to 8, wherein the machine (100) is equipped with a test oil circuit integrated module (25), a control oil circuit integrated module (32) and a hydraulic cylinder (21), and the three are connected via a hydraulic pipeline; the test oil circuit integrated module (25) controls the operation of the plug-in directional valve group (17), and the control oil circuit integrated module (32) controls the operation of the control oil circuit.

10. A hydraulic device for testing a hydraulic valve according to claim 9, characterized in that: The machine (100) is equipped with a liquid level and liquid temperature meter (1), an oil tank (2), a liquid level control relay (3) and an air filter (4); the liquid level and liquid temperature meter (1) is installed on the outside of the oil tank (2), and the liquid level control relay (3) and the air filter (4) are installed on the upper cover plate of the oil tank (2).

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