A hydraulic component testing device

Abstract

The application discloses a hydraulic element testing device, which comprises an electric control assembly for controlling and acquiring data, a hydraulic power station comprising a power pump and an oil tank, and a hydraulic valve testing loop comprising a first stop valve, a first flowmeter, and a rear ball valve, a rear proportional loading valve and a second flowmeter connected in series; the oil inlet of the first stop valve is communicated with the oil outlet of the power pump, and the oil outlet is used for being communicated with the oil inlet A of a measured hydraulic valve; the oil inlet of the first flowmeter is used for being communicated with the internal leakage port Y of the measured hydraulic valve, and the oil outlet is communicated with the oil tank; the oil inlet of the rear ball valve is used for being communicated with the oil outlet B of the measured hydraulic valve, and the oil outlet of the second flowmeter is communicated with the oil tank; a front unloading valve is communicated with the oil outlet of the first stop valve at the oil inlet, and communicated with the oil tank at the oil outlet; the device can be widely applied to the testing of hydraulic elements such as hydraulic cylinders, overflow valves, pressure reducing valves and sequence valves, a hydraulic testing loop is designed according to the performance requirements of the hydraulic elements, and the testing result can accurately diagnose the performance of the hydraulic elements.

Description

Technical Field

[0001] This invention relates to the field of hydraulic component technology, and more specifically to a hydraulic component testing device. Background Technology

[0002] Hydraulic equipment is widely used in various industries such as metallurgy, aviation, aerospace, shipbuilding, and military due to its advantages including light weight per unit power, flexible layout, stable and rapid operation, ease of operation and control, easy overload protection, and integrated electromechanical-hydraulic control. Commonly used hydraulic components in hydraulic systems include hydraulic cylinders, relief valves, pressure reducing valves, sequence valves, pilot-operated check valves, speed control valves, proportional pressure valves, and proportional flow valves. Their performance directly affects the stability of equipment operation. To ensure the reliable performance of spare parts, a hydraulic component testing device is needed for performance testing of hydraulic cylinders, relief valves, pressure reducing valves, sequence valves, pilot-operated check valves, speed control valves, proportional pressure valves, and proportional flow valves. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a hydraulic component testing device, which can be widely used for testing the performance of hydraulic cylinders, relief valves, pressure reducing valves, sequence valves, pilot-operated check valves, speed regulating valves, proportional pressure valves, and proportional flow valves. By designing hydraulic test circuits and test items according to the performance requirements of hydraulic components, the test results can accurately diagnose the performance of hydraulic components.

[0004] The solution to achieve the technical objective of this invention is a hydraulic component testing device, comprising:

[0005] Electronic control components are used to control and acquire data;

[0006] A hydraulic power unit, including a power pump and an oil tank;

[0007] The hydraulic valve test circuit includes a first shut-off valve, a first flow meter, and a rear ball valve, a rear proportional loading valve, and a second flow meter connected in series. The inlet of the first shut-off valve is connected to the outlet of the power pump, and its outlet is used to connect to the inlet A of the hydraulic valve under test. The inlet of the first flow meter is used to connect to the internal vent Y of the hydraulic valve under test, and its outlet is connected to the oil tank. The inlet of the rear ball valve is used to connect to the outlet B of the hydraulic valve under test, and the outlet of the second flow meter is connected to the oil tank.

[0008] The front unloading valve has its inlet connected to the outlet of the first shut-off valve and its outlet connected to the oil tank.

[0009] The hydraulic component testing device as described in claim 1 is characterized in that the hydraulic valve testing circuit further includes a rear unloading valve and a speed regulating valve connected in series, wherein the oil inlet of the rear unloading valve is connected to the oil inlet of the rear proportional loading valve, and the oil outlet of the speed regulating valve is connected to the oil outlet of the rear proportional loading valve.

[0010] In some embodiments, the hydraulic valve test circuit further includes a first ball valve and a second ball valve, wherein the oil inlet of the first ball valve is connected in parallel with the oil inlet of the front unloading valve to the oil outlet of the first shut-off valve; the oil inlet of the second ball valve is connected to the oil outlet of the first ball valve, and the oil outlet of the second ball valve is connected to the oil inlet of the rear ball valve.

[0011] In some embodiments, the hydraulic valve test circuit further includes a bridge-type proportional loading valve and a third ball valve. The inlet of the bridge-type proportional loading valve is connected to the outlet of the first ball valve. The bridge-type proportional loading valve includes a bridge-connected two-position two-way solenoid valve and four check valves. The inlet of the third ball valve is connected to the outlet of the bridge-type proportional loading valve, and the outlet of the third ball valve is connected to the inlet of the rear ball valve.

[0012] In some embodiments, the hydraulic power unit further includes a control pump;

[0013] The hydraulic valve test circuit also includes an external control drain circuit, which includes a two-position four-way solenoid valve, a first relief valve, and a first check valve. The inlet of the two-position four-way solenoid valve is connected to the outlet of the control pump, and one of the outlets of the two-position four-way solenoid valve is used to connect to the external control port X of the hydraulic valve under test. The inlet of the first check valve is used to connect to the external drain port T of the hydraulic valve under test, and the outlet is connected to the oil tank. The inlet of the first relief valve is connected to the outlet of the control pump, and the outlet is connected to the outlet of the first check valve.

[0014] In some embodiments, the hydraulic power unit further includes an internal drain oil tank, and the outlet of the first flow meter is connected to the internal drain oil tank; the hydraulic power unit further includes a second check valve and an oil pump for pumping oil from the internal drain oil tank to the oil tank, the inlet of the second check valve is connected to the outlet of the oil pump, and the outlet of the second check valve is connected to the oil tank.

[0015] In some embodiments, the hydraulic component testing apparatus further includes,

[0016] The hydraulic cylinder test circuit includes a second shut-off valve, a first three-position four-way directional valve, a fourth check valve, and two hydraulic cylinder internal relief ball valves. The oil inlet of the second shut-off valve is connected to the oil outlet of the power pump, and the oil outlet is connected to the P port of the first three-position four-way solenoid valve. The fourth check valve is connected to the T port of the first three-position four-way solenoid valve and the oil tank. The two oil outlets of the first three-position four-way solenoid valve are respectively used to connect the rod chamber and the rodless chamber of the hydraulic cylinder under test. The oil inlets of the two hydraulic cylinder internal relief ball valves are each connected to one oil outlet of the first three-position four-way solenoid valve.

[0017] In some embodiments, the hydraulic component testing apparatus further includes,

[0018] The pressure regulating circuit includes two fifth check valves and one second three-position four-way solenoid valve. The two fifth check valves are connected in series, and the oil inlets of the two fifth check valves are respectively connected to the two oil outlets of the second three-position four-way solenoid valve. The oil outlets of the two fifth check valves are connected to the oil tank. The oil inlet of the second three-position four-way solenoid valve is connected to the oil outlet of the second shut-off valve for two-stage pressure regulation.

[0019] In some embodiments, the pressure regulating circuit further includes two fifth check valves and one second three-position four-way solenoid valve. The four fifth check valves are connected in series, and the oil inlets of the four fifth check valves are respectively connected to the four oil outlets of the two second three-position four-way solenoid valves. The oil outlets of the four fifth check valves are connected to the oil tank. The oil inlets of the two second three-position four-way solenoid valves are both connected to the oil outlet of the second shut-off valve for four-stage pressure regulation.

[0020] In some embodiments, the hydraulic component testing device further includes a water-cooling assembly and a third check valve, and the hydraulic power station further includes a circulating pump. The two ends of the third check valve are respectively connected to the oil outlet of the circulating pump and the oil tank. The water-cooling assembly is used to cool the oil at the outlet of the third check valve that is undergoing heat exchange.

[0021] As can be seen from the above technical solution, the hydraulic component testing device provided by the present invention includes a hydraulic power station, a hydraulic valve test circuit, a front unloading valve, and an electronic control component for controlling and acquiring data; wherein: the hydraulic power station includes a power pump and an oil tank, the power pump providing a power source for the test; the hydraulic valve test circuit includes a first shut-off valve, a first flow meter, and a rear ball valve, a rear proportional loading valve, and a second flow meter connected in series; the oil inlet of the first shut-off valve is connected to the oil outlet of the power pump, and the outlet is used to connect to the oil inlet A of the hydraulic valve under test, controlling the on / off of the hydraulic oil circuit of the test hydraulic valve; the oil inlet of the first flow meter is used to connect to the internal leakage port Y of the hydraulic valve under test, and the oil outlet is connected to the oil tank, used to test the internal leakage; the oil inlet of the rear ball valve is used to connect to the oil outlet B of the hydraulic valve under test; the oil outlet of the second flow meter is connected to the oil tank, used to test the flow rate through the test hydraulic valve; the oil inlet of the front unloading valve is connected to the oil outlet of the first shut-off valve, and the oil outlet is connected to the oil tank, used for system depressurization. The hydraulic component testing device provided by this invention can be widely used for testing the performance of hydraulic cylinders, relief valves, pressure reducing valves, sequence valves, pilot-operated check valves, speed regulating valves, proportional pressure valves, and proportional flow valves. The hydraulic test circuit and test items are designed according to the performance requirements of the hydraulic components, and the test results can accurately diagnose the performance of the hydraulic components. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the hydraulic component testing device provided by the present invention.

[0023] Explanation of reference numerals in the attached diagram: 10-Power pump, 11-Oil tank, 12-First shut-off valve, 13-First flow meter, 14-First check valve, 15-Rear ball valve, 16-Rear proportional loading valve, 17-Second flow meter, 18-Front unloading valve, 19-Rear unloading valve, 20-Speed ​​control valve; 21-First ball valve, 22-Second ball valve; 23-Bridge proportional loading valve, 24-Third ball valve; 25-Control pump, 26-Two-position four-way solenoid valve 27-First relief valve; 28-Proportional relief valve; 29-Internal leakage oil tank; 30-Second check valve; 31-Oil pump; 32-Second shut-off valve; 33-First three-position four-way directional valve; 34-Fourth check valve; 35-Hydraulic cylinder internal leakage ball valve; 36-Fifth check valve; 37-Second three-position four-way solenoid valve; 38-Water cooling assembly; 39-Third check valve; 40-Circulation pump; 41-Pressure sensor; 42-Filter. Detailed Implementation

[0024] This invention provides a hydraulic component testing device, which can be widely used for testing the performance of hydraulic cylinders, relief valves, pressure reducing valves, sequence valves, pilot-operated check valves, speed regulating valves, proportional pressure valves, and proportional flow valves. The hydraulic test circuit and test items are designed according to the performance requirements of the hydraulic components, and the test results can accurately diagnose the performance of the hydraulic components. A specific embodiment is described in detail below:

[0025] Example

[0026] like Figure 1As shown, this embodiment provides a hydraulic component testing device, including a hydraulic power station, a hydraulic valve test circuit, a front unloading valve 18, and an electronic control component for controlling and acquiring data; wherein: the hydraulic power station includes a power pump 10 and an oil tank 11, the power pump 10 providing a power source for the test; the hydraulic valve test circuit includes a first shut-off valve 12, a first flow meter 13, and a rear ball valve 15, a rear proportional loading valve 16, and a second flow meter 17 connected in series; the oil inlet of the first shut-off valve 12 is connected to the oil outlet of the power pump 10. The inlet and outlet of the first flow meter 13 are connected to the inlet A of the hydraulic valve under test, controlling the on / off state of the hydraulic oil circuit of the test hydraulic valve; the inlet of the first flow meter 13 is connected to the internal vent Y of the hydraulic valve under test, and the outlet is connected to the oil tank 11; the inlet of the rear ball valve 15 is connected to the outlet B of the hydraulic valve under test; the outlet of the second flow meter 17 is connected to the oil tank 11, used to test the flow rate through the test hydraulic valve; the inlet of the front unloading valve 18 is connected to the outlet of the first shut-off valve 12, and the outlet is connected to the oil tank 11, used for system depressurization. The hydraulic component testing device provided by this invention can be widely used for testing the performance of hydraulic cylinders, relief valves, pressure reducing valves, sequence valves, hydraulically controlled check valves, speed regulating valves 20, proportional pressure valves, and proportional flow valves. The hydraulic test circuit and test items are designed according to the performance requirements of the hydraulic components, and the test results can accurately diagnose the performance of the hydraulic components. To accommodate different testing requirements for the hydraulic valves under test, in this embodiment, the hydraulic valve test circuit also includes a rear unloading valve 19 and a speed control valve 20 connected in series. The inlet of the rear unloading valve 19 is connected to the inlet of the rear proportional loading valve 16, and the outlet of the speed control valve 20 is connected to the outlet of the rear proportional loading valve 16. The switching of the three valves—rear ball valve 15, rear proportional loading valve 16, and rear unloading valve 19—is selected according to the requirements of the test valve.

[0027] To meet the pressure resistance test requirements of hydraulic valves, in this embodiment, the hydraulic valve test circuit also includes a first ball valve 21 and a second ball valve 22. The oil inlet of the first ball valve 21 is connected in parallel with the oil inlet of the front unloading valve 18 to the oil outlet of the first shut-off valve 12; the oil inlet of the second ball valve 22 is connected to the oil outlet of the first ball valve 21, and the oil outlet of the second ball valve 22 is connected to the oil inlet of the rear ball valve 15.

[0028] To further adapt to the pressure resistance test requirements of hydraulic valves, in this embodiment, the hydraulic valve test circuit also includes a bridge-type proportional loading valve 23 and a third ball valve 24. The oil inlet of the bridge-type proportional loading valve 23 is connected to the oil outlet of the first ball valve 21. The bridge-type proportional loading valve 23 includes a bridge-connected two-position two-way solenoid valve and four check valves. The oil inlet of the third ball valve 24 is connected to the oil outlet of the bridge-type proportional loading valve 23, and the oil outlet of the third ball valve 24 is connected to the oil inlet of the rear ball valve 15.

[0029] For testing hydraulic valves, the hydraulic power unit also includes a control pump 25; the hydraulic valve test circuit also includes an external control drain circuit, which includes a two-position four-way solenoid valve 26, a first relief valve 27, and a first check valve 14. The inlet of the two-position four-way solenoid valve 26 is connected to the outlet of the control pump 25, and one of the outlets of the two-position four-way solenoid valve 26 is used to connect to the external control port X of the hydraulic valve under test; the inlet of the first check valve 14 is used to connect to the external drain port T of the hydraulic valve under test, and the outlet is connected to the oil tank 11; the inlet of the first relief valve 27 is connected to the outlet of the control pump 25, and the outlet is connected to the outlet of the first check valve 14; the control pump 25 provides control oil to the external control test valve, and the pressure can be adjusted through the first relief valve 27; the two-position four-way solenoid valve 26 is used for reversing and providing control oil cut-off and conduction control to the external control test valve.

[0030] In one embodiment, the hydraulic power unit also includes an internal drain oil tank 29, with the outlet of the first flow meter 13 connected to the internal drain oil tank 29; the hydraulic power unit also includes a second check valve 30 and a pump 31 for drawing oil from the internal drain oil tank 29 to the main oil tank 11, and for drawing the internal drain oil of the test valve from the internal drain oil tank 29 to the main oil tank 11. The inlet of the second check valve 30 is connected to the outlet of the pump 31, and the outlet of the second check valve 30 is connected to the oil tank 11.

[0031] In order to make this hydraulic component device applicable to the testing of hydraulic cylinders, as one embodiment, the hydraulic component testing apparatus further includes:

[0032] The hydraulic cylinder test circuit includes a second shut-off valve 32, a first three-position four-way directional valve 33, a fourth check valve 34, and two hydraulic cylinder internal leakage ball valves 35. The inlet of the second shut-off valve 32 is connected to the outlet of the power pump 10, and the outlet is connected to the P port of the first three-position four-way solenoid valve, used to control the on / off of the hydraulic oil circuit of the test cylinder. The fourth check valve 34 connects the T port of the first three-position four-way solenoid valve and the oil tank 11. The two outlets of the first three-position four-way solenoid valve are respectively used to connect the rod chamber and the rodless chamber of the hydraulic cylinder under test, used to control the extension or retraction of the test cylinder. The inlets of the two hydraulic cylinder internal leakage ball valves 35 are each connected to one outlet of the first three-position four-way solenoid valve, used to test the internal leakage of the test cylinder.

[0033] In order to test the starting pressure of the test cylinder, as one implementation method, the hydraulic component testing device also includes:

[0034] The pressure regulating circuit includes two fifth check valves 36 and a second three-position four-way solenoid valve 37. The two fifth check valves 36 are connected in series, and the oil inlets of the two fifth check valves 36 are respectively connected to the two oil outlets of the second three-position four-way solenoid valve 37. The oil outlets of the two fifth check valves 36 are connected to the oil tank 11. The oil inlet of the second three-position four-way solenoid valve 37 is connected to the oil outlet of the second shut-off valve 32 for two-stage pressure regulation.

[0035] To further expand the pressure regulation range, in this embodiment, the pressure regulation circuit also includes two fifth check valves 36 and one second three-position four-way solenoid valve 37. The four fifth check valves 36 are connected in series, and the oil inlets of the four fifth check valves 36 are respectively connected to the four oil outlets of the two second three-position four-way solenoid valves 37. The oil outlets of the four fifth check valves 36 are connected to the oil tank 11. The oil inlets of the two second three-position four-way solenoid valves 37 are all connected to the oil outlet of the second shut-off valve 32 for four-level pressure regulation, which can perform low-to-medium pressure switching and medium-to-high pressure switching to meet the testing requirements of different hydraulic cylinders.

[0036] In order to achieve the recycling of the test oil and ensure that the oil temperature is within the required temperature range for testing, in this embodiment, the hydraulic component testing device also includes a water cooling component 38 and a third check valve 39. The hydraulic power station also includes a circulation pump 40. The two ends of the third check valve 39 are respectively connected to the oil outlet of the circulation pump 40 and the oil tank 11. The water cooling component 38 is used to cool the oil at the outlet of the heat exchange third check valve 39.

[0037] To accommodate different pressure requirements, in this embodiment, the hydraulic power station includes three power pumps 10 connected in parallel (MA1, MA2, MA3 shown in the figure). To regulate system pressure, in this embodiment, the hydraulic component testing device also includes a proportional relief valve 28, whose inlet is connected to the outlet of the power pump 10 and whose outlet is connected to the oil tank 11.

[0038] In order to avoid oil clogging of hydraulic components and ensure the quality of hydraulic oil, the hydraulic component testing device in this embodiment also includes a filter 42. The number and design position of the filter 42 can be adjusted according to the requirements, and this embodiment does not limit it specifically.

[0039] In order to detect the system pressure and the pressure at the test point and ensure safe testing, the hydraulic component testing device in this embodiment also includes a pressure sensor 41.

[0040] The hydraulic component testing device provided in this embodiment consists of hardware components such as a hydraulic power station, a test bench (each test circuit, circuit components, etc.), a high-voltage control cabinet, a control console, a sensor testing system, and an air-cooling system, as well as testing software components. The software is designed based on the LabVIEW development platform.

[0041] The hydraulic power station consists of test power pump 10 (MA1, MA2, MA3), circulation pump 40 (MA4), control pump 25 (MA5), and oil pump 31 (MA6).

[0042] (1) The power pump 10 provides a power source for the test and adjusts the system pressure through the proportional relief valve 28;

[0043] (2) The circulating pump 40 is used to regulate the temperature of the hydraulic oil in the system;

[0044] (3) The control pump 25 provides control oil to the external control test valve. The pressure can be adjusted through the overflow valve, and the reversing valve cuts off the control oil to the external control test valve.

[0045] (4) The oil pump 31 pumps the internal leakage oil of the test valve from the collection tank 11 to the main tank 11.

[0046] II. The test bench consists of two parts: a hydraulic cylinder test bench and a hydraulic valve test bench.

[0047] (1) The hydraulic cylinder test bench consists of a second shut-off valve 32 (controlling the opening and closing of the hydraulic oil circuit of the test cylinder), a three-position four-way reversing valve (controlling the extension or retraction of the test cylinder), a hydraulic cylinder internal leakage ball valve 35 (testing the internal leakage of the test cylinder), and a pressure regulating circuit for switching between low and medium pressure and switching between medium and high pressure (testing the starting pressure of the test cylinder).

[0048] (2) The hydraulic valve test bench consists of a first shut-off valve 12 (controlling the opening and closing of the hydraulic oil circuit of the test hydraulic valve), a front unloading valve 18 (used for system pressure relief), a first ball valve 21, a bridge-type proportional loading valve 23, a second ball valve 22 (the above three ball valves are used for pressure resistance test), a rear ball valve 15, a rear proportional loading valve 16, and a rear unloading valve 19 (the above three valves are selected according to the test valve), a second flow meter 17 (testing the flow rate through the test valve), and a first flow meter 13 (testing the internal leakage of the test valve).

[0049] Application Examples

[0050] The test hydraulic component includes:

[0051] Step 1: Overflow valve

[0052] 1.1 Pressure regulation range and pressure stability test

[0053] (1) Test circuit:

[0054] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0055] (2) Test conditions:

[0056] Test pressure: Make the system pressure approximately 115% of the upper limit of the pressure regulation range of the relief valve under test.

[0057] Test flow rate: The flow rate through the test relief valve is the test flow rate.

[0058] (3) Test method:

[0059] Pressure adjustment range: Adjust the pressure regulating handwheel of the relief valve under test from fully loose to fully tight, and then from fully tight to fully loose, repeating this test at least 3 times. Observe the pressure change range at port A and record the upper limit pressure value.

[0060] Pressure oscillation: Adjust the overflow valve under test to the upper limit of the pressure regulation range, and measure the pressure oscillation value from port A.

[0061] Pressure deviation: Adjust the overflow valve under test to the upper limit of the pressure regulation range, and measure the pressure deviation value within 1 minute using the pressure at port A.

[0062] 1.2 Internal Leakage Test

[0063] (1) Test circuit:

[0064] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0065] (2) Test conditions:

[0066] Test pressure: Set the system pressure to the upper limit of the pressure regulation range of the relief valve under test.

[0067] Test flow rate: The flow rate through the overflow valve being tested is the test flow rate.

[0068] (3) Test method:

[0069] Set the system pressure to 75% of the upper limit of the pressure regulation range of the relief valve under test. After 30 seconds, measure the internal leakage at the overflow port of the relief valve under test.

[0070] 1.3 Unloading pressure test

[0071] (1) Test circuit:

[0072] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0073] (2) Test conditions:

[0074] Test pressure: Set the system pressure to the upper limit of the pressure regulation range of the relief valve under test.

[0075] Test flow rate: The flow rate through the overflow valve being tested is the test flow rate.

[0076] 1.4 Pressure Loss Test

[0077] (1) Test circuit:

[0078] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0079] (2) Test conditions:

[0080] Test pressure: Make the system pressure slightly higher than the pressure of the fully open position of the relief valve being tested.

[0081] Test flow rate: The flow rate through the overflow valve being tested is the test flow rate.

[0082] (3) Test method:

[0083] The pressure difference between port A and port B is the pressure loss.

[0084] 1.5 Steady-state pressure-flow characteristic test

[0085] (1) Test circuit:

[0086] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0087] (2) Test conditions:

[0088] Test pressure: Set the system pressure to approximately 115% of the upper limit of the pressure adjustment range of the relief valve under test, so that it functions only as a safety valve; adjust the pressure adjustment handwheel of the relief valve under test to the upper limit of the pressure adjustment range.

[0089] Test flow rate: The flow rate through the overflow valve being tested is the test flow rate.

[0090] (3) Test method:

[0091] The system gradually reduces the pressure, and when the pressure drops to the closing pressure of the tested relief valve at the closure rate, the flow rate through the tested relief valve is measured.

[0092] Starting from the point where the test relief valve does not overflow, the system is gradually pressurized. When the pressure rises to the opening pressure corresponding to the opening rate of the test relief valve, the flow rate through the test relief valve is measured.

[0093] 1.6 Operational reliability test

[0094] (1) Test circuit:

[0095] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0096] (2) Test conditions:

[0097] Test pressure: Set the system pressure to approximately 130% of the upper limit of the pressure adjustment range of the relief valve under test, so that it functions only as a safety valve; adjust the pressure adjustment handwheel of the relief valve under test to the upper limit of the pressure adjustment range.

[0098] Test flow rate: The flow rate through the overflow valve being tested is the test flow rate.

[0099] (3) Test method:

[0100] Turn off the electromagnet and record the unloading pressure; turn the electromagnet on and record the pressure build-up.

[0101] Step 2 Pressure reducing valve

[0102] 2.1 Pressure regulation range and pressure stability test

[0103] (1) Test circuit:

[0104] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0105] (2) Test conditions:

[0106] Test pressure: Adjust the system pressure and the "hydraulic valve proportional loading" knob to make the system pressure the rated pressure of the pressure reducing valve under test.

[0107] Test flow rate: The flow rate through the pressure reducing valve being tested is the test flow rate.

[0108] (3) Test method:

[0109] Pressure adjustment range: Adjust the pressure regulating handwheel of the pressure reducing valve under test from fully loose to fully tight, and then from fully tight to fully loose, repeating this test at least 3 times. Observe the pressure change range at port B and record the upper limit pressure value.

[0110] Pressure oscillation: Adjust the pressure reducing valve under test to the upper limit of the pressure adjustment range, and measure the pressure oscillation value through port B.

[0111] Pressure deviation: Adjust the pressure reducing valve under test to the lower limit of the pressure regulation range (if the lower limit of the pressure regulation range is lower than 1.5MPa, adjust it to 1.5MPa), and measure the pressure deviation value within 1 minute using the pressure at port B.

[0112] 2.2 External Leakage Test

[0113] (1) Test circuit:

[0114] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0115] (2) Test conditions:

[0116] Test pressure: Adjust the pressure regulating handwheel of the pressure reducing valve under test so that the pressure at port B is at least 1.5 MPa.

[0117] Test flow rate: The flow rate through the pressure reducing valve being tested is zero or the test flow rate.

[0118] (3) Test method:

[0119] Set the system pressure to the rated pressure of the pressure reducing valve under test, and after it stabilizes, check for oil leakage.

[0120] 2.3 Operational reliability test

[0121] (1) Test circuit:

[0122] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0123] (2) Test conditions:

[0124] Test pressure: Adjust the handwheel of the "post proportional loading valve" and the pressure regulating valve under test so that the outlet pressure of the pressure regulating valve under test is at the lower limit of the pressure regulating range, and the minimum is 1.5 MPa; adjust the system pressure and the "post proportional loading valve" knob so that the inlet pressure of the pressure regulating valve under test is the rated pressure.

[0125] Test flow rate: The flow rate through the pressure reducing valve being tested is the test flow rate.

[0126] (3) Test method:

[0127] Quickly turn the "rear proportional loading valve" knob to its loosest position and record the unloading pressure; quickly turn the "rear proportional loading valve" knob to its tightest position and record the pressure build-up pressure.

[0128] 2.4 Inlet and outlet pressure-decompression stability test

[0129] (1) Test circuit:

[0130] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0131] (2) Test conditions:

[0132] Test pressure: Adjust the pressure regulating handwheel of the "post proportional loading valve" and the test pressure reducing valve so that the outlet pressure of the pressure reducing valve under test is at the lower limit of the pressure regulating range, and the minimum is 1.5MPa.

[0133] Test flow rate: The flow rate through the pressure reducing valve being tested is the test flow rate.

[0134] (3) Test method:

[0135] Adjust the system pressure to vary the inlet pressure from 3.5MPa to the rated pressure. When the pressure changes, press the "Manual Save" button. After recording, press the "Plot Curve" button.

[0136] 2.5 Flow rate variation-reduced pressure stability test

[0137] (1) Test circuit:

[0138] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0139] (2) Test conditions:

[0140] Test pressure: Adjust the pressure regulating handwheel of the "post proportional loading valve" and the test pressure reducing valve to make the outlet pressure of the test pressure reducing valve the rated pressure.

[0141] Test flow rate: The flow rate through the pressure reducing valve under test is increased from zero to the test flow rate.

[0142] (3) Test method:

[0143] Adjust the system pressure and the "Post-Proportional Loading Valve" knob to bring the inlet pressure to the rated pressure; adjust the system flow rate and the "Post-Hydraulic Valve Proportional Loading" knob to vary the flow rate through the valve under test from zero to the test flow rate. When the flow rate changes, press the "Manual Save" button. After recording, press the "Plot Curve" button.

[0144] Step 3 Sequence Valve

[0145] 3.1 Pressure regulation range and pressure stability test

[0146] (1) Test circuit:

[0147] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0148] (2) Test conditions:

[0149] Test pressure: Adjust the system pressure to approximately 115% of the upper limit of the pressure adjustment range of the sequence valve under test, so that it only functions as a safety valve.

[0150] Test flow rate: The flow rate through the sequence valve being tested is the test flow rate.

[0151] (3) Test method:

[0152] Pressure adjustment range: Adjust the pressure regulating handwheel of the sequence valve under test from fully loose to fully tight, and then from fully tight to fully loose, repeating this test at least 3 times. Observe the pressure change range at port A and record the upper limit pressure.

[0153] Pressure oscillation: Adjust the sequence valve under test to the upper limit of the pressure regulation range, and measure the pressure oscillation value from port A.

[0154] Pressure deviation: Adjust the sequence valve under test to the upper limit of the pressure regulation range, and measure the pressure deviation value within 1 minute using the pressure at port A.

[0155] 3.2 Internal Leakage Test

[0156] (1) Test circuit:

[0157] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0158] (2) Test conditions:

[0159] Test pressure: Adjust the system pressure to approximately 50% of the upper limit of the pressure adjustment range of the sequence valve under test; adjust the pressure regulating handwheel of the sequence valve under test to 115% of the upper limit of the pressure adjustment range.

[0160] (3) Test method:

[0161] Adjust the system pressure to 50% of the upper limit of the pressure regulation range of the sequence valve under test, and measure the internal leakage at the overflow port of the sequence valve under test after 30 seconds.

[0162] 3.3 External Leakage Test

[0163] (1) Test circuit:

[0164] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0165] (2) Test conditions:

[0166] Test pressure: Set the system pressure to the upper limit of the pressure adjustment range of the sequence valve under test.

[0167] (3) Test method:

[0168] Adjust the system pressure to the upper limit of the pressure adjustment range of the sequence valve under test; check the oil leakage of the sequence valve under test after 30 seconds.

[0169] 3.4 Pressure Loss Test

[0170] (1) Test circuit:

[0171] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0172] (2) Test conditions:

[0173] Test pressure: Adjust the system pressure to be slightly higher than the pressure of the test sequence valve when it is fully open.

[0174] Test flow rate: The flow rate through the sequence valve being tested is the test flow rate.

[0175] (3) Test method:

[0176] The pressure difference between port A and port B is the pressure loss.

[0177] 3.5 Steady-state pressure-flow characteristic test

[0178] (1) Test circuit:

[0179] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0180] (2) Test conditions:

[0181] Test pressure: Adjust the system pressure to approximately 115% of the upper limit of the pressure adjustment range of the valve under test; adjust the pressure adjustment handwheel of the valve under test to the upper limit of the pressure adjustment range.

[0182] Test flow rate: The flow rate through the test sequence valve is the test flow rate.

[0183] (3) Test method:

[0184] Adjust the system pressure to gradually reduce the pressure. When the pressure drops to the pressure required for the test sequence valve to close, measure the flow rate through the test sequence valve. When the flow rate changes, press the "Manual Save" button until the flow rate is zero, then press the "Plot Curve" button.

[0185] Step 4: Hydraulic Control Check Valve

[0186] 4.1 Start the pressure test

[0187] (1) Test circuit:

[0188] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0189] (2) Test method:

[0190] Adjust the system pressure until the main flow rate is not zero, then stop. Press the "Start Pressure Test" button to record the results.

[0191] 4.2 Forward Pressure Loss Test

[0192] (1) Test circuit:

[0193] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0194] (2) Test method:

[0195] Adjust the system pressure to obtain the test flow rate through the hydraulically controlled check valve under test. Press the "Positive Pressure Loss" button to record the flow rate.

[0196] 4.3 Test for controlling piston internal leakage

[0197] (1) Test circuit:

[0198] The first shut-off valve and leakage reversing valve are open, while the remaining ball valves are closed.

[0199] (2) Test method:

[0200] Adjust the system pressure to reach the rated pressure, and press the "Record" button to record.

[0201] 4.4 Reverse pressure loss test

[0202] (1) Test circuit:

[0203] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0204] (2) Test method:

[0205] Adjust the system pressure to ensure the flow rate through the tested hydraulic check valve is the test flow rate. Press the "Reverse Pressure Loss" button to record the data.

[0206] 4.5 Internal Leakage Test

[0207] (1) Test circuit:

[0208] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0209] (2) Test method:

[0210] Adjust the system pressure to 1 MPa and the rated pressure respectively, and press the "Internal Leakage" button to record the results.

[0211] 4.6 Controlled Pressure Characteristic Test

[0212] (1) Test circuit:

[0213] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0214] (2) Test method:

[0215] Reverse opening minimum control pressure test:

[0216] ① Loosen the pressure regulating handwheel of the "control relief valve" to its loosest position.

[0217] ② Adjust the system pressure to 90% of the rated pressure and start the control pump.

[0218] ③ Gradually rotate the "control overflow valve" until the test liquid control check valve opens in reverse, then press the "record" button to record.

[0219] Reverse shutdown maximum control pressure test:

[0220] ① Turn the pressure regulating handwheel of the "control relief valve" to 10 MPa.

[0221] ② Adjust the system flow rate to the rated flow rate of the hydraulic control check valve under test, and start the control pump.

[0222] ③ Gradually rotate the "control overflow valve" until the test liquid control check valve closes in the reverse direction, then press the "record" button to record.

[0223] Step 5 Speed ​​control valve

[0224] 5.1 Flow rate adjustment range test

[0225] (1) Test circuit:

[0226] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0227] (2) Test conditions:

[0228] Test pressure: Adjust the system pressure to make the pressure difference between the inlet and outlet of the speed control valve under test the lowest possible pressure.

[0229] Test flow rate: The flow rate through the speed control valve under test when the speed control valve is fully released is the test flow rate.

[0230] (3) Test method:

[0231] Select the handwheel in sequence to adjust to 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, and 100% of the total scale, and press "Manual Save" to record the corresponding flow rate value.

[0232] 5.2 Internal Leakage Test

[0233] (1) Test circuit:

[0234] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0235] (2) Test conditions:

[0236] Test pressure: Adjust the adjusting handwheel of the speed control valve under test to the fully tightened position; adjust the system pressure so that the inlet pressure of the speed control valve under test is the rated pressure.

[0237] Test flow rate: 20 L / min is sufficient.

[0238] (3) Test method:

[0239] Adjust the handwheel of the speed control valve under test so that the valve is opened and then completely closed. After 30 seconds, press the "Record" button to record the result.

[0240] 5.3 Reverse pressure loss test

[0241] (1) Test circuit:

[0242] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0243] (2) Test conditions:

[0244] Test flow rate: Make the system flow rate the upper limit of the range of the speed control valve being tested.

[0245] (3) Test method:

[0246] Adjust the adjustment handwheel of the speed control valve under test to the fully loose position, and press the "Record" button to record.

[0247] 5.4 External Leakage Test

[0248] (1) Test circuit:

[0249] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0250] (2) Test conditions:

[0251] Test pressure: Adjust the system pressure and the "hydraulic valve post-proportional load" knob so that the outlet pressure of the speed control valve under test is 90% of the rated pressure.

[0252] Test flow rate: approximately 10 L / min is sufficient.

[0253] (3) Test method:

[0254] Press the "Record" button to record.

[0255] 5.5 Inlet pressure-flow characteristic test

[0256] (1) Test circuit:

[0257] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0258] (2) Test conditions:

[0259] Test pressure: The system pressure is adjusted to the minimum operating pressure of the speed control valve under test.

[0260] Test flow rate: Adjust the speed control valve under test so that the flow rate is the minimum control flow rate or 10L / min.

[0261] (3) Test method:

[0262] Adjust the system pressure to vary the inlet pressure of the speed control valve under test between the minimum and maximum working pressure.

[0263] 3.6 Outlet pressure-flow characteristic test

[0264] (1) Test circuit:

[0265] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0266] (2) Test conditions:

[0267] Test pressure: Adjust the system pressure to make the inlet pressure of the speed control valve under test the rated pressure.

[0268] Test flow rate: Adjust the speed control valve under test so that the flow rate is the minimum control flow rate or 10L / min.

[0269] (3) Test method:

[0270] Adjust the "hydraulic valve post-proportional loading" knob to vary the outlet pressure of the speed control valve under test from 5% to 90% of the rated pressure.

[0271] Step 6 Hydraulic Cylinder

[0272] 6.1 Pressure characteristic test

[0273] (1) Test circuit:

[0274] The second shut-off valve is open, the first three-position four-way directional valve is open, and the low pressure, medium pressure, medium-high pressure, and high pressure valves are selected according to the situation. All other valves are closed.

[0275] (2) Test conditions:

[0276] The hydraulic cylinder under test is started under no-load conditions and reciprocated several times in its full stroke to completely expel the air from the cylinder.

[0277] (3) Test method:

[0278] Adjust the system pressure to gradually increase the pressure in the rodless chamber until the hydraulic cylinder starts.

[0279] 6.2 Stroke Test

[0280] (1) Test circuit:

[0281] The second shut-off valve is open, the first three-position four-way directional valve is open, and all other valves are closed.

[0282] (2) Test method:

[0283] When the piston is at its limit position, the cylinder is reversed via the "first three-position four-way directional valve". One stroke is completed within 60 seconds after the "record" button is pressed.

[0284] 6.3 Pressure Resistance Test

[0285] (1) Test circuit:

[0286] The second shut-off valve is open, the first three-position four-way directional valve is open, and all other valves are closed.

[0287] (2) Test method:

[0288] By switching the left and right positions of the "first three-position four-way directional valve", the piston of the hydraulic cylinder under test is stopped at both ends of its stroke. The system pressure is adjusted so that the pressure in the working chamber is 1.5 times the rated pressure.

[0289] 6.4 Internal Leakage Test

[0290] (1) Test circuit:

[0291] The second shut-off valve is open, the first three-position four-way directional valve and the shut-off valve without pressurization chamber are open, and all other valves are closed.

[0292] (2) Test method:

[0293] Move the hydraulic cylinder piston to its left or right limit position, adjust the system pressure, pressurize the piston to the rated pressure, open the corresponding manual ball valve, use a measuring cup to measure the leakage within 30 seconds, and read and input the leakage amount.

[0294] 6.5 External Leakage Test

[0295] (1) Test method:

[0296] During the first four tests, check for leaks at the piston rod seal, the static seal of the cylinder, the mating surface, and the adjustable mechanism.

[0297] Step 7: Proportional relief valve

[0298] 7.1 Internal Leakage Characteristic Test

[0299] (1) Test circuit:

[0300] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0301] (2) Test conditions:

[0302] Ensure the test flow rate is at least 10% greater than the rated flow rate of the valve under test. The maximum system pressure should be less than the rated pressure of the valve under test. Set the input signal of the valve under test to 0.

[0303] (3) Test method:

[0304] Adjust the input signal of the tested relief valve to 25% of the rated pressure. Slowly decrease the system pressure until it reaches 80% of the set relief pressure of the tested valve. Record the total leakage at this point. Decrease the system pressure to the minimum, and then slowly increase the system pressure until the inlet pressure is 80% of the set pressure of the tested relief valve. Record the total leakage at this point.

[0305] 7.2 Pressure-flow characteristic test

[0306] (1) Test circuit:

[0307] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0308] (2) Test conditions:

[0309] The X-axis represents the overflow flow rate, the Y-axis represents the pressure signal, the signal generator's triangular wave frequency is less than or equal to 0.05 Hz, and the amplitude is sufficient to make the test overflow valve reach the rated flow rate.

[0310] (3) Test method:

[0311] The system is adjusted to 10% of the rated flow rate of the relief valve under test, and the input signal is 25% of the rated pressure of the relief valve under test. A control signal for one cycle is input, and the control pressure and flow rate within one cycle are recorded to obtain the pressure-flow characteristic curve.

[0312] Repeat the above steps when the pressure of the tested relief valve is 50% of its rated pressure to obtain the pressure-flow characteristic curve.

[0313] Repeat the above steps when the pressure of the tested relief valve is 75% of its rated pressure to obtain the pressure-flow characteristic curve.

[0314] Repeat the above steps when the pressure of the tested relief valve is 100% of its rated pressure to obtain the pressure-flow characteristic curve.

[0315] 7.3 Pressure-Input Signal Characteristic Test under Constant Flow Rate

[0316] (1) Test circuit:

[0317] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0318] (2) Test conditions:

[0319] The X-axis represents the input signal; the Y-axis represents the pressure signal, generated by a triangular wave generator at a frequency of 0.05 Hz or lower.

[0320] (3) Test method:

[0321] Allow the flow rate through the relief valve under test to be 10% ± 2% of the rated flow rate. Cycle the input signal several times within the maximum and minimum ranges, and check if it exceeds the range. Record the pressure-input signal curve for one cycle.

[0322] Repeat the above steps when the test flow rate is 50% of the rated flow rate of the relief valve under test.

[0323] Repeat the above steps when the test flow rate is 10% of the rated flow rate of the relief valve under test.

[0324] Step 8: Proportional pressure reducing valve

[0325] 8.1 Pressure-Input Signal Characteristic Test under Constant Flow Rate

[0326] (1) Test circuit:

[0327] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0328] (2) Test conditions:

[0329] The X-axis represents the input signal; the Y-axis represents the pressure signal, and the triangular wave signal generator operates at a frequency of 0.05Hz or lower.

[0330] (3) Test method:

[0331] Adjust the system flow rate to 50% of the rated flow rate of the pressure reducing valve under test. The signal generator outputs a control signal for one cycle and records the pressure-input signal curve of the pressure reducing valve under test within one cycle.

[0332] When the rated flow rate of the pressure reducing valve under test is 0, repeat the above steps to obtain the pressure-input signal curve.

[0333] When the rated flow rate of the pressure reducing valve under test is 100%, repeat the above steps to obtain the pressure-input signal curve.

[0334] 8.2 Pilot port and leakage test

[0335] (1) Test circuit:

[0336] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0337] (2) Test conditions:

[0338] Adjust the input signal of the pressure reducing valve under test to 0, and adjust the system pressure so that the input pressure of the pressure reducing valve under test is its rated inlet pressure.

[0339] (3) Test method:

[0340] Add an input signal of 25% of the rated pressure of the pressure reducing valve under test, and record the flow rate at the pilot drain port.

[0341] Adjust the input signal to 50% of the rated pressure of the pressure reducing valve under test, and record the flow rate at the pilot drain port.

[0342] Adjust the input signal to 75% of the rated pressure of the pressure reducing valve under test, and record the flow rate at the pilot drain port.

[0343] Adjust the input signal to 100% of the rated pressure of the pressure reducing valve under test, and record the flow rate at the pilot drain port.

[0344] 8.3 Constant Input Pressure-Flow Characteristic Test

[0345] (1) Test circuit:

[0346] The first shut-off valve and the subsequent ball valve are open, the subsequent proportional loading valve is fully open, and the remaining ball valves are closed.

[0347] (2) Test conditions:

[0348] The X-axis represents the flow rate signal, the Y-axis represents the pressure signal, the triangular wave signal generator frequency is less than or equal to 0.05 Hz, and the input range corresponds to the flow rate from 0 to 100%.

[0349] (3) Test method:

[0350] The test flow rate is 10% of the rated flow rate of the pressure reducing valve under test. The inlet pressure of the pressure reducing valve under test is adjusted to the rated pressure, and the outlet pressure is adjusted to 25% of the rated pressure. The signal generator generates a cycle change, and the flow rate is recorded starting from 0. The pressure-flow characteristic curve is recorded within one cycle.

[0351] Repeat the above test with an outlet pressure of 50% of the rated pressure.

[0352] Repeat the above test with the outlet pressure set to 100% of the rated pressure.

[0353] The above-described one or more technical solutions in the embodiments of the present invention have at least one or more of the following technical effects:

[0354] 1. A hydraulic component testing device, which can be used for performance testing of hydraulic cylinders, relief valves, pressure reducing valves, sequence valves, hydraulic control check valves, speed regulating valves, proportional first shut-off valves, and proportional flow valves.

[0355] 2. The testing device automatically collects pressure signals, flow signals, and input signals, and plots them as performance curves.

[0356] 3. The software system of this testing device can automatically calculate static indicators such as hysteresis, zero bias, linearity, and leakage of hydraulic components.

[0357] 4. Testers can select between manual and automatic control modes and design hydraulic test circuits and test items according to the performance requirements of hydraulic valves.

[0358] 5. This testing device can test the pressure regulation range and pressure stability of the relief valve, internal leakage test, unloading pressure test, pressure loss test, steady-state pressure-flow characteristic test, and operation reliability test.

[0359] 6. This testing device can test the pressure regulating range and pressure stability of pressure reducing valves, external leakage test, operation reliability test, inlet and outlet pressure-pressure reducing stability test, and flow change-pressure reducing stability test.

[0360] 7. This testing device can test the pressure regulation range and pressure stability of sequence valves, as well as internal leakage, external leakage, pressure loss, and steady-state pressure-flow characteristics.

[0361] 8. This testing device can test the opening pressure, forward pressure loss, control piston internal leakage, reverse pressure loss, internal leakage, and control pressure characteristics of a hydraulic check valve.

[0362] 9. This testing device can test the flow regulation range, internal leakage, reverse pressure loss, external leakage, inlet pressure-flow characteristics, and outlet pressure-flow characteristics of speed control valves.

[0363] 10. This testing device can test the starting pressure characteristics, stroke, pressure resistance, internal leakage, and external leakage of hydraulic cylinders.

[0364] 11. This testing device can test the internal leakage characteristics, pressure-flow characteristics, and pressure-input signal characteristics of proportional relief valves under constant flow conditions.

[0365] 12. This testing device can test the constant input pressure-flow characteristics, pilot port and leakage tests, and pressure-input signal characteristics under constant flow of a proportional pressure reducing valve.

[0366] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0367] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A hydraulic component testing device, characterized in that, include: Electronic control components are used to control and acquire data; A hydraulic power unit, including a power pump and an oil tank; The hydraulic valve test circuit includes a first shut-off valve, a first flow meter, and a rear ball valve, a rear proportional loading valve, and a second flow meter connected in series. The inlet of the first shut-off valve is connected to the outlet of the power pump, and its outlet is used to connect to the inlet A of the hydraulic valve under test. The inlet of the first flow meter is used to connect to the internal vent Y of the hydraulic valve under test, and its outlet is connected to the oil tank. The inlet of the rear ball valve is used to connect to the outlet B of the hydraulic valve under test, and the outlet of the second flow meter is connected to the oil tank. The front unloading valve has its inlet connected to the outlet of the first shut-off valve and its outlet connected to the oil tank. The hydraulic component testing device also includes: The hydraulic cylinder test circuit includes a second shut-off valve, a first three-position four-way directional valve, a fourth check valve, and two hydraulic cylinder internal relief ball valves. The oil inlet of the second shut-off valve is connected to the oil outlet of the power pump, and the oil outlet is connected to the P port of the first three-position four-way solenoid valve. The fourth check valve connects the T port of the first three-position four-way solenoid valve and the oil tank. The two oil outlets of the first three-position four-way solenoid valve are respectively used to connect the rod chamber and the rodless chamber of the hydraulic cylinder under test. The oil inlets of the two hydraulic cylinder internal relief ball valves are each connected to one oil outlet of the first three-position four-way solenoid valve. The hydraulic component testing device also includes: The pressure regulating circuit includes four fifth check valves and two second three-position four-way solenoid valves. The four fifth check valves are connected in series, and the oil inlets of the four fifth check valves are connected to the four oil outlets of the two second three-position four-way solenoid valves. The oil outlets of the four fifth check valves are connected to the oil tank. The oil inlets of the two second three-position four-way solenoid valves are both connected to the oil outlet of the second shut-off valve for four-stage pressure regulation.

2. The hydraulic component testing device as described in claim 1, characterized in that, The hydraulic valve test circuit also includes a rear unloading valve and a speed control valve connected in series. The oil inlet of the rear unloading valve is connected to the oil inlet of the rear proportional loading valve, and the oil outlet of the speed control valve is connected to the oil outlet of the rear proportional loading valve.

3. The hydraulic component testing device as described in claim 2, characterized in that, The hydraulic valve test circuit also includes a first ball valve and a second ball valve. The oil inlet of the first ball valve is connected in parallel with the oil inlet of the front unloading valve to the oil outlet of the first shut-off valve. The oil inlet of the second ball valve is connected to the oil outlet of the first ball valve, and the oil outlet of the second ball valve is connected to the oil inlet of the rear ball valve.

4. The hydraulic component testing device as described in claim 3, characterized in that, The hydraulic valve test circuit also includes a bridge-type proportional loading valve and a third ball valve. The inlet of the bridge-type proportional loading valve is connected to the outlet of the first ball valve. The bridge-type proportional loading valve includes a bridge-connected two-position two-way solenoid valve and four check valves. The inlet of the third ball valve is connected to the outlet of the bridge-type proportional loading valve, and the outlet of the third ball valve is connected to the inlet of the rear ball valve.

5. The hydraulic component testing device as described in claim 1, characterized in that, The hydraulic power station also includes a control pump; The hydraulic valve test circuit also includes an external control drain circuit, which includes a two-position four-way solenoid valve, a first relief valve, and a first check valve. The inlet of the two-position four-way solenoid valve is connected to the outlet of the control pump, and one of the outlets of the two-position four-way solenoid valve is used to connect to the external control port X of the hydraulic valve under test. The inlet of the first check valve is used to connect to the external drain port T of the hydraulic valve under test, and the outlet is connected to the oil tank. The inlet of the first relief valve is connected to the outlet of the control pump, and the outlet is connected to the outlet of the first check valve.

6. The hydraulic component testing device as described in claim 1, characterized in that, The hydraulic power station also includes an internal drain oil tank, and the outlet of the first flow meter is connected to the internal drain oil tank; the hydraulic power station also includes a second check valve and an oil pump for pumping oil from the internal drain oil tank to the oil tank, the inlet of the second check valve is connected to the outlet of the oil pump, and the outlet of the second check valve is connected to the oil tank.

7. The hydraulic component testing device according to any one of claims 1-6, characterized in that, The hydraulic component testing device also includes a water-cooling component and a third check valve. The hydraulic power station also includes a circulating pump. The two ends of the third check valve are respectively connected to the oil outlet of the circulating pump and the oil tank. The water-cooling component is used to cool the oil at the outlet of the third check valve that is undergoing heat exchange.

Images