A valve test bench

Abstract

The present application discloses a valve test bench, including a hydraulic valve test circuit, a gas-liquid pressure relief valve test circuit, and a control circuit. The hydraulic valve test circuit controls the on-off of the oil circuit through various ball valves, electromagnetic ball valves, etc., and can realize the construction of various test circuits to meet the testing of different hydraulic valves to be tested; the gas-liquid pressure relief valve test circuit is used for performance testing of gas-liquid pressure relief valves to be tested of different specifications under different working conditions; the output end of the control circuit is provided with a number of control oil ports for providing control hydraulic oil of different pressures. The present application can complete the testing of commonly used hydraulic valves and gas-liquid pressure relief valves of the main engine factory through the combination of electricity, liquid and gas. Various special working condition circuits can meet the testing requirements of hydraulic valves. The test circuit is simple and easy to operate. According to the testing requirements of different valves, the test conditions of the valve can be achieved through simple operations, and the required tests can be completed in one assembly; the collected data is rich, repeated testing is reduced, and the testing time is shortened.

Description

Technical Field

[0001] The present application relates to the field of testing technology, and in particular, to a valve testing bench. Background Art

[0002] Hydraulics is the core technology of construction machinery, and its performance directly affects product quality. With the continuous development of hydraulic technology, the performance requirements of hydraulic components are getting higher and higher. At the same time, driven by the national policy of localization of hydraulic components, various OEMs have increased performance testing and comparative testing of hydraulic valves, resulting in a sharp increase in the demand for performance testing of hydraulic valves.

[0003] Existing hydraulic valve tests all have corresponding test benches, but most test benches can only test valves of corresponding specifications, and the operation process is complicated and the applicable working conditions are single.

[0004] Therefore, a valve test bench with comprehensive functions, easy installation and simple operation is needed to meet the testing needs of the OEM's high-performance products and shorten the product development cycle. Summary of the Invention

[0005] The embodiment of the present application provides a valve testing bench to solve the technical problems that the existing test bench can only test valves of corresponding specifications, has a complicated operation process, and is only adaptable to a single working condition.

[0006] The technical solutions adopted in this application are as follows:

[0007] A valve test bench includes a hydraulic valve test circuit, a gas-liquid pressure relief valve test circuit, and a control circuit, wherein:

[0008] The hydraulic valve test circuit controls the oil circuit on and off through various ball valves, electromagnetic ball valves, reversing valves, throttle valves, and one-way valves, and can realize the construction of various test circuits to meet the testing of different hydraulic valves to be tested;

[0009] The gas-liquid pressure relief valve test circuit is used for performance testing of gas-liquid pressure relief valves of different specifications under different working conditions;

[0010] The output end of the control circuit is provided with a plurality of control oil ports for providing control hydraulic oil of different pressures to the tested hydraulic valve and the tested gas-liquid pressure relief valve under different working conditions.

[0011] Preferably, the hydraulic valve test circuit includes a variable pump, a safety valve A, a proportional relief valve A, an electromagnetic reversing valve A, a pressure sensor A, a pressure sensor G, a ball valve B, a ball valve A, a proportional speed regulating valve A, an electromagnetic ball valve A, a proportional relief valve C, an electromagnetic ball valve B, a proportional relief valve D, a temperature sensor A, a pressure sensor H, a throttle control device, a pressure sensor L, a throttle valve C, a flow meter B, a pressure sensor M, a pressure sensor N, a throttle valve D, a flow meter C, a pressure sensor O, a measuring cup with a TL port, and a pressure sensor I, temperature sensor B, flowmeter A, pressure sensor J; ball valve E, solenoid ball valve C, pressure sensor K, throttle valve B, ball valve F, proportional relief valve E, ball valve G, check valve A, check valve B, check valve C, check valve D, proportional speed control valve B. Among them, the oil suction port S of the variable pump is connected to the oil tank, the outlet P of the variable pump is connected to the inlet P2 of the safety valve A, the inlet P3 of the proportional relief valve A, and the inlet P4 of the solenoid reversing valve A; the outlet T of the safety valve A is connected to the oil tank, and the outlet T1 of the proportional relief valve A is connected to the oil tank. The outlet T2 of the electromagnetic reversing valve A is connected to the oil tank, the working port A of the electromagnetic reversing valve A is connected to the inlet P16 of the pressure sensor G, the inlet P18 of the ball valve A, and the inlet P17 of the ball valve B. The outlet T9 of the ball valve A is connected to the inlet P19 of the proportional speed control valve A, the outlet T10 of the proportional speed control valve A is connected to the outlet T8 of the ball valve B, the inlet P20 of the electromagnetic ball valve A, the inlet P22 of the electromagnetic ball valve B, the inlet P24 of the ball valve C, the inlet P27 of the temperature sensor A, the inlet P28 of the pressure sensor H, and the throttling control device. The inlet P29 is connected to the inlet P30 of the hydraulic valve to be tested, the outlet T11 of the electromagnetic ball valve A is connected to the inlet P21 of the proportional relief valve C, the outlet T12 of the proportional relief valve C is connected to the oil tank, the outlet T13 of the electromagnetic ball valve B is connected to the inlet P23 of the proportional relief valve D, the outlet T14 of the proportional relief valve D is connected to the oil tank, the outlet T15 of the ball valve C is connected to the oil inlet P25 of the accumulator and the inlet P26 of the ball valve D, the outlet T16 of the ball valve D is connected to the oil tank, and the outlet T17 of the throttling control device is connected to the oil tank;

[0012] The outlet T18 of the hydraulic valve to be tested is connected to the inlet P39 of the pressure sensor I41, the inlet P40 of the temperature sensor B, the inlet P42 of the ball valve E, and the inlet P41 of the flow meter A. The outlet T23 of the ball valve E is connected to the oil tank. The outlet T24 of the flow meter A is connected to the inlet P43 of the pressure sensor J, the inlet P44 of the electromagnetic ball valve C, the inlet P45 of the throttle valve B, and the inlet P46 of the ball valve F. The outlet T27 of the ball valve F is connected to the inlet P47 of the proportional relief valve E. The outlet T28 of the proportional relief valve E is connected to the outlet T2 of the electromagnetic ball valve C. 5. The outlet T26 of the throttle valve B, the inlet P48 of the pressure sensor K, the inlet P49 of the ball valve G, the inlet P50 of the check valve A, and the outlet T32 of the check valve C are connected. The outlet T39 of the ball valve G is connected to the fuel tank. The outlet T29 of the check valve A is connected to the inlet P52 of the proportional speed control valve B and the outlet T30 of the check valve B. The outlet T31 of the proportional speed control valve B is connected to the inlet P53 of the check valve C and the inlet P54 of the check valve D. The outlet T33 of the check valve D is connected to the inlet P51 of the check valve B and the working port B of the solenoid reversing valve A.

[0013] The reversing valve test port A2 is connected to the inlet P31 of the pressure sensor L and the inlet P32 of the throttle valve C, the outlet T19 of the throttle valve C is connected to the inlet P33 of the flowmeter B, and the outlet T20 of the flowmeter B is connected to the inlet P37 of the pressure sensor M and the reversing valve test port B2; the reversing valve test port A3 is connected to the inlet P34 of the pressure sensor N and the inlet P35 of the throttle valve D, the outlet T21 of the throttle valve D is connected to the inlet P36 of the flowmeter C, and the outlet T22 of the flowmeter C is connected to the inlet P38 of the pressure sensor O and the reversing valve test port B3.

[0014] Preferably, the throttling control device adopts a throttle valve A.

[0015] Preferably, the throttling control device adopts a servo proportional valve.

[0016] Preferably, the throttling control device adopts a servo valve.

[0017] Preferably, the gas-liquid pressure relief valve test circuit includes a high-pressure gas source 57, a pressure sensor P, a gas proportional pressure reducing valve, a pressure sensor Q, a ball valve I, a pressure sensor S, a high-pressure gas tank 65, a gas-liquid pressure relief valve, a pressure sensor T, a ball valve J, and a ball valve K. The outlet P55 of the high-pressure gas source is connected to the inlet P56 of the pressure sensor P, the inlet P57 of the gas proportional pressure reducing valve, and the air inlet P65 of the gas-liquid pressure relief valve to be tested. The outlet T34 of the gas proportional pressure reducing valve is connected to the inlet P58 of the pressure sensor Q and the inlet P60 of the ball valve I. The outlet of the ball valve I is connected to the inlet P58 of the pressure sensor Q and the inlet P60 of the ball valve I. The outlet T36 is connected to the inlet P63 of the pressure sensor S, the inlet P67 of the ball valve J, and the air inlet P64 of the high-pressure gas tank. The outlet T41 of the ball valve J is connected to the atmosphere. The air outlet T40 of the high-pressure gas tank is connected to the inlet P68 of the ball valve K. The outlet T42 of the ball valve K is connected to the pneumatic control port Px4 and the pneumatic control port of the gas-liquid pressure relief valve to be tested. The air outlet T37 of the gas-liquid pressure relief valve to be tested is connected to the atmosphere. The oil return port T38 of the gas-liquid pressure relief valve to be tested is connected to the oil tank. The internal control oil of the gas-liquid pressure relief valve to be tested is connected to the inlet P66 of the pressure sensor T.

[0018] Preferably, the control circuit includes a control pump, a safety valve B, an electromagnetic reversing valve B, a pressure sensor B, a pressure sensor C, a proportional pressure reducing valve A, a proportional pressure reducing valve B, a pressure sensor D, a pressure sensor E, and a pressure sensor F. The oil suction port S1 of the control pump is connected to the oil tank, and the outlet P1 of the control pump is connected to the inlet P6 of the safety valve B, the inlet P7 of the proportional relief valve B, the inlet P8 of the electromagnetic reversing valve B, the inlet P11 of the proportional pressure reducing valve A, the inlet P12 of the proportional pressure reducing valve B, the inlet P15 of the pressure sensor F, and the control oil port Px3 is connected, the outlet T3 of the safety valve B is connected to the oil tank, the outlet T4 of the proportional relief valve B is connected to the oil tank, the outlet T5 of the solenoid reversing valve B is connected to the oil tank, the working port A1 of the solenoid reversing valve B is connected to the inlet P9 of the pressure sensor B, the outlet T6 of the proportional reducing valve A is connected to the inlet P13 of the pressure sensor D and the control oil port Px1, the outlet T7 of the proportional reducing valve B is connected to the inlet P14 of the pressure sensor E and the control oil port Px2, and the working port B1 of the solenoid reversing valve B is connected to the inlet P10 of the pressure sensor C.

[0019] Preferably, it also includes a temperature control circuit, which includes a cooling pump, a safety valve C, and a temperature-regulating oil tank. The inlet S2 of the cooling pump is connected to the oil tank, the outlet P69 of the cooling pump is connected to the inlet P70 of the safety valve C and the inlet P71 of the temperature-regulating oil tank, the outlet T44 of the temperature-regulating oil tank is connected to the oil tank, and the high-pressure gas tank is inside the temperature-regulating oil tank.

[0020] Preferably, a constant pressure control circuit is further included, which includes a ball valve C, a ball valve D, an accumulator, a ball valve H, and a pressure sensor R. The inlet P59 of the ball valve H is connected to the outlet T34 of the pneumatic proportional pressure reducing valve, the outlet T35 of the ball valve H is connected to the inlet P61 of the pressure sensor R and the charging port P62 of the accumulator, the oil inlet P25 of the accumulator is connected to the outlet T15 of the ball valve C and the inlet P26 of the ball valve D, the inlet P24 of the ball valve C is connected to the outlet T10 of the proportional speed control valve A, the outlet T8 of the ball valve B, the inlet P20 of the electromagnetic ball valve A, the inlet P22 of the electromagnetic ball valve B, the inlet P27 of the temperature sensor A, the inlet P28 of the pressure sensor H, the inlet P29 of the throttling control device, and the inlet P30 of the hydraulic valve to be tested, and the outlet T16 of the ball valve D is connected to the oil tank.

[0021] Compared with the existing technology, this application has the following beneficial effects:

[0022] The present invention provides a valve test bench, including a hydraulic valve test circuit, a gas-liquid pressure relief valve test circuit, and a control circuit. The hydraulic valve test circuit controls the on-off of the oil circuit through various ball valves, electromagnetic ball valves, etc., and can realize the construction of various test circuits to meet the testing of different hydraulic valves to be tested; the gas-liquid pressure relief valve test circuit is used for performance testing of gas-liquid pressure relief valves to be tested of different specifications under different working conditions; the output end of the control circuit is provided with a number of control oil ports for providing control hydraulic oil of different pressures. The present application can complete the testing of commonly used hydraulic valves and gas-liquid pressure relief valves of the main engine factory through the combination of electricity, liquid and gas. Various special working condition circuits can meet the testing requirements of hydraulic valves. The test circuit is simple and easy to operate. According to the testing requirements of different valves, the test conditions of the valve can be achieved through simple operations, and the required tests can be completed in one assembly; the collected data is rich, repeated testing is reduced, and the testing time is shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of the principle of the valve test bench of the preferred embodiment of the present application.

[0025] In the figure: 1. Variable pump; 2. Safety valve A; 3. Proportional relief valve A; 4. Solenoid reversing valve A; 5. Pressure sensor A; 6. Control pump; 7. Safety valve B; 8. Proportional relief valve B; 9. Solenoid reversing valve B; 10. Pressure sensor B; 11. Pressure sensor C; 12. Proportional pressure reducing valve A; 13. Proportional pressure reducing valve B; 14. Pressure sensor D; 15. Pressure sensor E; 16. Pressure sensor F; 17. Pressure sensor G; 18 , ball valve B; 19, ball valve A; 20, proportional speed control valve A; 21, electromagnetic ball valve A; 22, proportional relief valve C; 23, electromagnetic ball valve B; 24, proportional relief valve D; 25, ball valve C; 26, ball valve D; 27, accumulator; 28, temperature sensor A; 29, pressure sensor H; 30, throttle valve A; 31, hydraulic valve to be tested; 32, pressure sensor L; 33, throttle valve C; 34, flow meter B; 35, pressure sensor M; 36, Pressure sensor N; 37. Throttle valve D; 38. Flow meter C; 39. Pressure sensor O; 40. Measuring cup; 41. Pressure sensor I; 42. Temperature sensor B; 43. Flow meter A; 44. Pressure sensor J; 45. Ball valve E; 46. Solenoid ball valve C; 47. Pressure sensor K; 48. Throttle valve B; 49. Ball valve F; 50. Proportional relief valve E; 51. Ball valve G; 52. Check valve A; 53. Check valve B; 54. Check valve C; 55. One-way valve D; 56. Proportional speed control valve B; 57. High-pressure gas source; 58. Pressure sensor P; 59. Proportional pressure reducing valve for gas; 60. Pressure sensor Q; 61. Ball valve H; 62. Ball valve I; 63. Pressure sensor R; 64. Pressure sensor S; 65. High-pressure gas tank; 66. Gas-liquid pressure relief valve; 67. Pressure sensor T; 68. Ball valve J; 69. Ball valve K; 70. Cooling pump; 71. Safety valve C; 72. Temperature-controlled oil tank. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] Reference Figure 1 The preferred embodiment of the present application provides a valve test bench, including a hydraulic valve test circuit, a gas-liquid pressure relief valve test circuit, and a control circuit, wherein:

[0028] The hydraulic valve test circuit controls the oil circuit on and off through various ball valves, electromagnetic ball valves, reversing valves, throttle valves, and one-way valves, and can realize the construction of various test circuits to meet the testing of different hydraulic valves to be tested;

[0029] The gas-liquid pressure relief valve test circuit is used for performance testing of gas-liquid pressure relief valves of different specifications under different working conditions;

[0030] The output end of the control circuit is provided with a plurality of control oil ports for providing control hydraulic oil of different pressures to the tested hydraulic valve and the tested gas-liquid pressure relief valve under different working conditions.

[0031] This embodiment provides a valve test bench, including a hydraulic valve test circuit, a gas-liquid pressure relief valve test circuit, and a control circuit. The hydraulic valve test circuit controls the on-off of the oil circuit through various ball valves, electromagnetic ball valves, etc., and can realize the construction of various test circuits to meet the testing of different hydraulic valves to be tested; the gas-liquid pressure relief valve test circuit is used for performance testing of gas-liquid pressure relief valves of different specifications to be tested under different working conditions; the output end of the control circuit is provided with a number of control oil ports for providing control hydraulic oil of different pressures. This embodiment can complete the testing of commonly used hydraulic valves and gas-liquid pressure relief valves of the main engine factory through the combination of electricity, liquid and gas. Various special working condition circuits can meet the testing requirements of hydraulic valves. The test circuit is simple and easy to operate. According to the testing requirements of different valves, the test conditions of the valve can be achieved through simple operations, and the required tests can be completed in one assembly; the collected data is rich, repeated testing is reduced, and the testing time is shortened.

[0032] Preferably, the hydraulic valve test circuit includes a variable pump 1, a safety valve A2, a proportional relief valve A3, an electromagnetic reversing valve A4, a pressure sensor A5, a pressure sensor G17, a ball valve B18, a ball valve A19, a proportional speed regulating valve A20, an electromagnetic ball valve A21, a proportional relief valve C22, an electromagnetic ball valve B23, a proportional relief valve D24, a temperature sensor A28, a pressure sensor H29, a throttle control device, a pressure sensor L32, a throttle valve C33, a flow meter B34, a pressure sensor M35, a pressure sensor N36, a throttle valve D37, a flow meter C38, a pressure sensor O39, and a TL port. Measuring cup 40, pressure sensor I41, temperature sensor B42, flowmeter A43, pressure sensor J44; ball valve E45, electromagnetic ball valve C46, ​​pressure sensor K47, throttle valve B48, ball valve F49, proportional relief valve E50, ball valve G51, check valve A52, check valve B53, check valve C54, check valve D55, proportional speed control valve B56, among which, the oil suction port S of the variable pump 1 is connected to the oil tank, the outlet P of the variable pump 1 is connected to the inlet P2 of the safety valve A2, the inlet P3 of the proportional relief valve A3, and the inlet P4 of the electromagnetic reversing valve A4, the outlet T of the safety valve A2 is connected to the oil tank, and the proportional For example, the outlet T1 of the relief valve A3 is connected to the oil tank, the outlet T2 of the electromagnetic reversing valve A4 is connected to the oil tank, the working port A of the electromagnetic reversing valve A4 is connected to the inlet P16 of the pressure sensor G17, the inlet P18 of the ball valve A19, and the inlet P17 of the ball valve B18, the outlet T9 of the ball valve A19 is connected to the inlet P19 of the proportional speed control valve A20, the outlet T10 of the proportional speed control valve A20 is connected to the outlet T8 of the ball valve B18, the inlet P20 of the electromagnetic ball valve A21, the inlet P22 of the electromagnetic ball valve B23, the inlet P24 of the ball valve C25, the inlet P27 of the temperature sensor A28, and the inlet of the pressure sensor H29. P28, the inlet P29 of the throttling control device, and the inlet P30 of the hydraulic valve 31 to be tested are connected, the outlet T11 of the electromagnetic ball valve A21 is connected to the inlet P21 of the proportional relief valve C22, the outlet T12 of the proportional relief valve C22 is connected to the oil tank, the outlet T13 of the electromagnetic ball valve B23 is connected to the inlet P23 of the proportional relief valve D24, the outlet T14 of the proportional relief valve D24 is connected to the oil tank, the outlet T15 of the ball valve C25 is connected to the oil inlet P25 of the accumulator 27 and the inlet P26 of the ball valve D26, the outlet T16 of the ball valve D26 is connected to the oil tank, and the outlet T17 of the throttling control device is connected to the oil tank.

[0033] The outlet T18 of the hydraulic valve 31 to be tested is connected to the inlet P39 of the pressure sensor I41, the inlet P40 of the temperature sensor B42, the inlet P42 of the ball valve E45, and the inlet P41 of the flow meter A43. The outlet T23 of the ball valve E45 is connected to the oil tank. The outlet T24 of the flow meter A43 is connected to the inlet P43 of the pressure sensor J44, the inlet P44 of the electromagnetic ball valve C46, ​​the inlet P45 of the throttle valve B48, and the inlet P46 of the ball valve F49. The outlet T27 of the ball valve F49 is connected to the inlet P47 of the proportional relief valve E50. The outlet T28 of the proportional relief valve E50 is connected to the outlet T25 of the electromagnetic ball valve C46. , the outlet T26 of the throttle valve B48, the inlet P48 of the pressure sensor K47, the inlet P49 of the ball valve G51, the inlet P50 of the check valve A52, and the outlet T32 of the check valve C54 are connected, the outlet T39 of the ball valve G51 is connected to the fuel tank, the outlet T29 of the check valve A52 is connected to the inlet P52 of the proportional speed control valve B56 and the outlet T30 of the check valve B53, the outlet T31 of the proportional speed control valve B56 is connected to the inlet P53 of the check valve C54 and the inlet P54 of the check valve D55, the outlet T33 of the check valve D55 is connected to the inlet P51 of the check valve B53 and the working port B of the solenoid reversing valve A4;

[0034] The reversing valve test port A2 is connected to the inlet P31 of the pressure sensor L32 and the inlet P32 of the throttle valve C33, the outlet T19 of the throttle valve C33 is connected to the inlet P33 of the flowmeter B34, and the outlet T20 of the flowmeter B34 is connected to the inlet P37 of the pressure sensor M35 and the reversing valve test port B2; the reversing valve test port A3 is connected to the inlet P34 of the pressure sensor N36 and the inlet P35 of the throttle valve D37, the outlet T21 of the throttle valve D37 is connected to the inlet P36 of the flowmeter C38, and the outlet T22 of the flowmeter C38 is connected to the inlet P38 of the pressure sensor O39 and the reversing valve test port B3.

[0035] In a preferred embodiment of the present application, the throttle control device adopts a throttle valve A30.

[0036] In a preferred embodiment of the present application, the throttling control device adopts a servo proportional valve.

[0037] In a preferred embodiment of the present application, the throttling control device adopts a servo valve.

[0038] In a preferred embodiment of the present application, the gas-liquid pressure relief valve test circuit includes a high-pressure gas source 57, a pressure sensor P58, a gas-use proportional pressure reducing valve 59, a pressure sensor Q60, a ball valve I 62, a pressure sensor S64, a high-pressure gas tank 65, a gas-liquid pressure relief valve 66, a pressure sensor T67, a ball valve J68, and a ball valve K69. The outlet P55 of the high-pressure gas source 57 is connected to the inlet P56 of the pressure sensor P58, the inlet P57 of the gas-use proportional pressure reducing valve 59, and the gas inlet P65 of the gas-liquid pressure relief valve to be tested. The outlet T34 of the gas-use proportional pressure reducing valve 59 is connected to the inlet P58 of the pressure sensor Q60 and the inlet P60 of the ball valve I62. The outlet T36 of the ball valve I62 is connected to the inlet P63 of the pressure sensor S64 and the ball valve The inlet P67 of J68 is connected to the air inlet P64 of the high-pressure gas tank 65, the outlet T41 of the ball valve J68 is connected to the atmosphere, the outlet T40 of the high-pressure gas tank 65 is connected to the inlet P68 of the ball valve K69, the outlet T42 of the ball valve K69 is connected to the pneumatic control port Px4 and the pneumatic control port of the gas-liquid pressure relief valve 66 to be tested, the outlet T37 of the gas-liquid pressure relief valve 66 to be tested is connected to the atmosphere, the oil return port T38 of the gas-liquid pressure relief valve 66 to be tested is connected to the oil tank, and the internal control oil of the gas-liquid pressure relief valve 66 to be tested is connected to the inlet P66 of the pressure sensor T67.

[0039] In a preferred embodiment of the present application, the control circuit includes a control pump 6, a safety valve B7, an electromagnetic reversing valve B9, a pressure sensor B10, a pressure sensor C11, a proportional pressure reducing valve A12, a proportional pressure reducing valve B13, a pressure sensor D14, a pressure sensor E15, and a pressure sensor F16. The oil suction port S1 of the control pump 6 is connected to the oil tank, and the outlet P1 of the control pump 6 is connected to the inlet P6 of the safety valve B7, the inlet P7 of the proportional relief valve B8, the inlet P8 of the electromagnetic reversing valve B9, the inlet P11 of the proportional pressure reducing valve A12, the inlet P12 of the proportional pressure reducing valve B13, and the inlet of the pressure sensor F16. The outlet T3 of the safety valve B7 is connected to the oil tank, the outlet T4 of the proportional relief valve B8 is connected to the oil tank, the outlet T5 of the solenoid reversing valve B9 is connected to the oil tank, the working port A1 of the solenoid reversing valve B9 is connected to the inlet P9 of the pressure sensor B10, the outlet T6 of the proportional reducing valve A12 is connected to the inlet P13 of the pressure sensor D14 and the control oil port Px1, the outlet T7 of the proportional reducing valve B13 is connected to the inlet P14 of the pressure sensor E15 and the control oil port Px2, and the working port B1 of the solenoid reversing valve B9 is connected to the inlet P10 of the pressure sensor C11.

[0040] In a preferred embodiment of the present application, the valve test bench also includes a temperature control circuit, which includes a cooling pump 70, a safety valve C71, and a temperature-regulating oil tank 72. The inlet S2 of the cooling pump 70 is connected to the oil tank, the outlet P69 of the cooling pump 70 is connected to the inlet P70 of the safety valve C71 and the inlet P71 of the temperature-regulating oil tank 72, the outlet T44 of the temperature-regulating oil tank 72 is connected to the oil tank, and the high-pressure gas tank 65 is inside the temperature-regulating oil tank 72.

[0041] In a preferred embodiment of the present application, the valve test bench further includes a constant pressure control circuit, which includes a ball valve C25, a ball valve D26, an accumulator 27, a ball valve H61, and a pressure sensor R63. The inlet P59 of the ball valve H61 is connected to the outlet T34 of the gas proportional pressure reducing valve 59, and the outlet T35 of the ball valve H61 is connected to the inlet P61 of the pressure sensor R63 and the charging port P62 of the accumulator 27. The oil inlet P25 of the accumulator 27 is connected to the ball valve. The outlet T15 of C25 is connected to the inlet P26 of the ball valve D26, the inlet P24 of the ball valve C25 is connected to the outlet T10 of the proportional speed control valve A20, the outlet T8 of the ball valve B18, the inlet P20 of the electromagnetic ball valve A21, the inlet P22 of the electromagnetic ball valve B23, the inlet P27 of the temperature sensor A28, the inlet P28 of the pressure sensor H29, the inlet P29 of the throttling control device, and the inlet P30 of the hydraulic valve 31 to be tested, and the outlet T16 of the ball valve D26 is connected to the oil tank.

[0042] The working principle of the above embodiment of the present application is as follows:

[0043] First, set the system pressure. Set the pressure of safety valve A2, safety valve B7, safety valve C71, proportional relief valve A3, and proportional relief valve B8 according to the experimental requirements. Due to the hysteresis loop of the pressure valve, all pressure valves should be adjusted from small to large pressures, and cannot be adjusted from large to small.

[0044] Relief valve test: inlet connected to P30, outlet connected to T18.

[0045] During the pressure difference-flow curve, steady-state pressure-flow, control component adjustment "force" experiment, step response, pressure resistance test, pressure-oil temperature characteristic experiment and other tests, the solenoid b1 of the solenoid reversing valve A4 is energized, the solenoid reversing valve A4 is in the right position, the ball valve B18 is closed, the ball valve A19 is open, the ball valve C25, the solenoid ball valve A21, the solenoid ball valve B23, the throttle valve A30, the ball valve E45, the ball valve F49, and the throttle valve B48 are closed, and the solenoid ball valve C46 and the ball valve G51 are opened.

[0046] The high-pressure oil circuit is: P-P4-A-P16-P18-T9-P19-T10-P27-P28-P30;

[0047] The low-pressure circuit is:

[0048] T18-P39-P40-P41-T24-P43-P44-T25-P48-P49-T39.

[0049] Adjust the A20 signal of the proportional speed control valve as required, and test with reference to the standards "GBT 8107-2012 Determination of pressure difference-flow characteristics of hydraulic valves", "JBT 10374-2013 Hydraulic relief valve", "GBT8105-87 Pressure control valve test method", and "GBT15623.3-2012 Hydraulic transmission electrically modulated hydraulic control valve Part 3: Pressure control valve test method".

[0050] During the internal leakage test, the electromagnet b1 is energized, the electromagnetic reversing valve A4 is in the right position, the ball valve A19 is closed, the ball valve B18 is open, the ball valve C25, the electromagnetic ball valve A21, the electromagnetic ball valve B23, the throttle valve A30, the ball valve E45, the ball valve F49, and the throttle valve B48 are closed.

[0051] The high-pressure oil circuit is: P-P4-A-P16-P17-T8-P27-P28-P30;

[0052] The low-pressure circuit is T18-TL-measuring cup;

[0053] Test the valve for internal leakage according to the standard "JBT 10374-2013 Hydraulic Overflow Valve".

[0054] During the flow step pressure response test, when solenoid B1 is energized, solenoid directional valve A4 is in the right position, ball valve B18 is closed, ball valve A19 is open, ball valve C25, solenoid ball valve A21, throttle valve A30, ball valve E45, ball valve F49, and throttle valve B48 are closed, and solenoid ball valve C46, ​​solenoid ball valve B23, and ball valve G51 are open. The high-pressure oil circuit is P-P4-A-P16-P18-T9-P19-T10-P27-P28-P30, the flow step branch oil circuit is P30-P22-T13-P23-T14, and the low-pressure circuit is T18-P39-P40-P41-T24-P43-P44-T25-P48-P49-T39. According to the standard "GB 8105-87 Pressure Control Valve Test Method", adjust the pressure of the proportional relief valve D24, control the opening and closing of the solenoid ball valve B23, and test the flow step pressure response characteristics.

[0055] Pressure reducing valve test: the inlet is connected to P30, the outlet is connected to T18, and the oil return port is t.

[0056] During tests such as the pressure difference-flow curve, steady-state pressure-flow, control component adjustment "force" experiment, step response, pressure resistance test, pressure-oil temperature characteristics, and flow change pressure reduction stability characteristics, solenoid b1 is energized, the solenoid reversing valve A4 is in the right position, the ball valve B18 is closed, the ball valve A19 is open, the ball valve C25, the solenoid ball valve A21, the solenoid ball valve B23, the throttle valve A30, the ball valve E45, the ball valve F49, and the solenoid ball valve C46 are closed, and the throttle valve B48 and the ball valve G51 are opened.

[0057] The high-pressure oil circuit is: P-P4-A-P16-P18-T9-P19-T10-P27-P28-P30;

[0058] The low-pressure circuit is: T18-P39-P40-P41-T24-P43-P45-T26-P48-P49-T39;

[0059] The test was carried out in accordance with the standards "GBT 8107-2012 Determination of pressure differential-flow characteristics of hydraulic valves", "JBT10367-2014 Hydraulic pressure reducing valve", "GBT 8105-87 Test method for pressure control valves", and "GBT15623.3-2012 Hydraulic transmission electrically modulated hydraulic control valves Part 3: Test method for pressure control valves".

[0060] To ensure the stability of pressure reduction when the inlet pressure changes, the solenoid b1 is energized, the solenoid reversing valve A4 is in the right position, the ball valve B18 is opened, the ball valve A19 is closed, the ball valve C25, the solenoid ball valve A21, the throttle valve A30, the ball valve E45, the ball valve F49, and the solenoid ball valve C46 are closed, and the throttle valve B48, the solenoid ball valve B23, and the ball valve G51 are opened.

[0061] The high-pressure oil circuit is: P-P4-A-P16-P17-T8-P22-P27-P28-P30, P22-T13-P23,

[0062] The low-pressure circuit is: T18-P39-P40-P41-T24-P43-P45-T26-P48-P49-T39.

[0063] Complete the test in accordance with JBT 10367-2014 Hydraulic Pressure Reducing Valve.

[0064] Reverse relief pressure reducing valve, reverse relief function pressure-input signal characteristic curve, solenoid a1 of solenoid reversing valve A4 is energized, solenoid reversing valve A4 is in the left position, ball valve B18 is open, ball valve A19 is closed, ball valve C25, solenoid ball valve A21, solenoid ball valve B23, throttle valve A30, ball valve E45, ball valve F49, throttle valve B48, ball valve G51 are closed, and solenoid ball valve C46 is open. The high-pressure oil circuit is:

[0065] P-P4-B-P5-P51-T30-P52-T31-P54-T32-P48-T25-P44-P43-T24-P41-P40-P39-T18; P30 is connected to the T port of the pressure reducing valve ( Figure 1 not shown in the table),

[0066] The low-pressure oil circuit is:

[0067] P30-P28-P27-T8-P17-P16-A-T2.

[0068] The test was completed in accordance with GBT 15623.3-2012 Hydraulic transmission electrically modulated hydraulic control valves Part 3: Test methods for pressure control valves.

[0069] Check valve test: inlet connected to P30, outlet connected to T18, control port is k.

[0070] Internal leakage test, solenoid a1 is energized, solenoid reversing valve A4 is in the left position, ball valve B18 is open, ball valve A19 is closed, ball valve C25, solenoid ball valve A21, solenoid ball valve B23, throttle valve A30, ball valve E45, ball valve F49, throttle valve B48, and ball valve G51 are closed, and solenoid ball valve C46 is open.

[0071] The high pressure oil circuit is:

[0072] P-P4-B-P5-P51-T30-P52-T31-P54-T32-P48-T25-P44-P43-T24-P41-P40-P39-T18;

[0073] The low-pressure circuit is: P30-TL-measuring cup.

[0074] Refer to "JBT 10364-2014 Hydraulic Check Valve" for testing.

[0075] During the reverse pressure drop and control pressure characteristic tests, solenoid a1 is energized, solenoid directional valve A4 is in the left position, ball valve B18 is open, ball valve A19 is closed, ball valve C25, solenoid ball valve A21, solenoid ball valve B23, throttle valve A30, ball valve E45, ball valve F49, throttle valve B48, and ball valve G51 are closed, and solenoid ball valve C46 is open. The control port of the hydraulically piloted check valve is k, which is connected to Px1 or Px2.

[0076] The high pressure oil circuit is:

[0077] P-P4-B-P5-P51-T30-P52-T31-P54-T32-P48-T25-P44-P43-T24-P41-P40-P39-T18;

[0078] Low-pressure oil return is: P30-P28-P27-T8-P17-P16-A-T2.

[0079] Refer to "JBT 10364-2014 Hydraulic Check Valve" for testing.

[0080] Pressure difference-flow curve, when electromagnet b1 is energized, electromagnetic reversing valve A4 is in the right position, ball valve B18 is closed, ball valve A19 is open, ball valve C25, electromagnetic ball valve A21, electromagnetic ball valve B23, throttle valve A30, ball valve E45, ball valve F49, and electromagnetic ball valve C46 are closed, and throttle valve B48 and ball valve G51 are open. The high-pressure oil circuit is:

[0081] P-P4-A-P16-P18-T9-P19-T10-P27-P28-P30;

[0082] The low-pressure circuit is: T18-P39-P40-P41-T24-P43-P45-T26-P48-P49-T39;

[0083] Refer to "JBT 10364-2014 Hydraulic Check Valve" for testing.

[0084] Start the pressure test, solenoid b1 is energized, solenoid reversing valve A4 is in the right position, ball valve B18 is closed, ball valve A19 is open, ball valve C25, solenoid ball valve A21, solenoid ball valve B23, ball valve F49, throttle valve B48, solenoid ball valve C46 are closed, throttle valve A30, ball valve E45 are open. The high-pressure oil circuit is:

[0085] P-P4-A-P16-P18-T9-P19-T10-P27-P28-P29-P30;

[0086] The bypass circuit is: P29-T17;

[0087] When the opening pressure is ≤1 bar, the outlet T17 of the throttle valve A30 and the outlet T18 of the one-way valve under test are directly open. The inlet pressure of the one-way valve under test is adjusted by adjusting the opening of the throttle valve A30. When the opening pressure is greater than 1 bar, the low-pressure circuit is: T18-P39-P40-P41-P42-T23, and the test is carried out in accordance with "JBT10364-2014 Hydraulic One-way Valve".

[0088] Directional valve test: the inlet is connected to P30, the return oil port is connected to T18, and the two working oil ports are connected to A2, B2 or A3, B3 respectively. If the reversing valve requires external oil control, the liquid control oil port is connected to Px1 or Px2.

[0089] When testing the pressure resistance, sliding valve function, pressure loss, valve core displacement-input signal characteristics, pressure difference-flow curve, valve core displacement-temperature characteristics, step response, and frequency response characteristics, solenoid b1 is energized, the solenoid reversing valve A4 is in the right position, the ball valve B18 is closed, the ball valve A19 is open, the ball valve C25, the solenoid ball valve A21, the solenoid ball valve B23, the throttle valve A30, the ball valve E45, the solenoid ball valve C46, ​​and the throttle valve B48 are closed, and the ball valve F49 and the ball valve G51 are open.

[0090] The oil inlet circuit of the reversing valve is:

[0091] P-P4-A-P16-P18-T9-P19-T10-P27-P28-P30;

[0092] The working oil circuit is:

[0093] A2-P31-P32-T19-P33-T20-P37-B2;

[0094] The oil return circuit is:

[0095] T18-P39-P40-P41-T24-P43-P46-T27-P47-T28-P48-P49-T39.

[0096] Adjust the A20 signal of the proportional speed control valve as required, and conduct tests in accordance with "JBT 10365-2014 Hydraulic Solenoid Directional Valve", "JBT10369-2014 Hydraulic Manual and Roller Directional Valve", "JBT 10373-2014 Hydraulic Electro-hydraulic Directional Valve and Hydraulic Directional Valve", and "GBT 15623.1-2018 Hydraulic Transmission Electrically Modulated Hydraulic Control Valve Part 1: Four-Way Directional Flow Control Valve Test Method".

[0097] During the internal leakage test, solenoid B1 is energized, solenoid directional valve A4 is in the right position, ball valve B18 is open, ball valve A19 is closed, and ball valves C25, A21, B23, and A30 are closed. The directional valve's oil inlet circuit is: P-P4-A-P16-P17-T8-P27-P28-P30. The leakage port to be tested is connected to TL. Tests are performed in accordance with JBT 10365-2014 Hydraulic Solenoid Directional Valves, JBT 10369-2014 Hydraulic Manual and Roller Directional Valves, JBT 10373-2014 Hydraulic Electro-Hydraulic Directional Valves and Hydraulic Directional Valves, and GBT 15623.1-2018 Hydraulic Transmission Electrically Modulated Hydraulic Control Valves - Part 1: Test Methods for Four-Way Directional Flow Control Valves.

[0098] Multi-way valve test: the inlet is connected to P30, the return oil port is connected to T18, and the two working oil ports are connected to A2, B2 or A3, B3 respectively. If the multi-way valve needs external oil control, the liquid control oil port is connected to Px1 or Px2.

[0099] During the pressure resistance test, switching performance, valve core function, pressure loss, safety valve performance, overload valve performance, back pressure test, and load sensor performance test, the solenoid b1 is energized, the solenoid reversing valve A4 is in the right position, the ball valve B18 is closed, the ball valve A19 is open, the ball valve C25, the solenoid ball valve A21, the solenoid ball valve B23, the throttle valve A30, the ball valve E45, the solenoid ball valve C46, ​​and the throttle valve B48 are closed, and the ball valve F49 and the ball valve G51 are open. The oil inlet circuit of the multi-way valve is:

[0100] P-P4-A-P16-P18-T9-P19-T10-P27-P28-P30;

[0101] The working oil circuit is:

[0102] A2-P31-P32-T19-P33-T20-P37-B2;

[0103] The oil return circuit is:

[0104] T18-P39-P40-P41-T24-P43-P46-T27-P47-T28-P48-P49-T39.

[0105] Refer to "JBT 8729-2013 Hydraulic Multi-way Reversing Valve" for testing.

[0106] During the internal leakage test, energize solenoid B1, position solenoid directional valve A4 to the right, open ball valve B18, close ball valve A19, and close ball valves C25, A21, B23, and A30. The directional valve's oil inlet circuit is: P-P4-A-P16-P17-T8-P27-P28-P30. Connect the leakage port to TL. Test according to JBT 8729-2013 Hydraulic Multi-way Directional Valves.

[0107] Throttle valve test: inlet connected to P30, oil return port connected to T18

[0108] During the pressure resistance performance, flow adjustment range, and forward pressure loss tests, solenoid b1 is energized, solenoid reversing valve A4 is in the right position, ball valve B18 is closed, ball valve A19 is open, ball valve C25, solenoid ball valve A21, solenoid ball valve B23, throttle valve A30, ball valve E45, solenoid ball valve C46, ​​and ball valve F49 are closed, and throttle valve B48 and ball valve G51 are opened.

[0109] The high pressure oil circuit is:

[0110] P-P4-A-P16-P18-T9-P19-T10-P27-P28-P30;

[0111] The low-pressure oil circuit is:

[0112] T18-P39-P40-P41-T24-P43-P45-T26-P48-P49-T39.

[0113] Refer to "JBT 10368-2014 Hydraulic Throttle Valve" for testing.

[0114] During the reverse pressure loss test, solenoid a1 is energized, the solenoid reversing valve A4 is in the left position, the ball valve B18 is open, the ball valve A19 is closed, the ball valve C25, the solenoid ball valve A21, the solenoid ball valve B23, the throttle valve A30, the ball valve E45, the ball valve F49, the throttle valve B48, and the ball valve G51 are closed, and the solenoid ball valve C46 is opened.

[0115] The high pressure oil circuit is:

[0116] P-P4-B-P5-P51-T30-P52-T31-P54-T32-P48-T25-P44-P43-T24-P41-P40-P39-T18;

[0117] The low-pressure oil circuit is:

[0118] P30-P28-P27-T8-P17-P16-A-T2.

[0119] Refer to "JBT 10368-2014 Hydraulic Throttle Valve" for testing.

[0120] During the internal leakage test, the solenoid b1 of the solenoid reversing valve A4 is energized, the solenoid reversing valve A4 is in the right position, the ball valve B18 is open, the ball valve A19 is closed, and the ball valve C25, the solenoid ball valve A21, the solenoid ball valve B23, the throttle valve A30, the ball valve E45, the solenoid ball valve C46, ​​the ball valve F49, the throttle valve B48, and the ball valve G51 are closed.

[0121] The high pressure oil circuit is:

[0122] P-P4-A-P16-P17-T8-P27-P28-P30; connect the outlet of the throttle valve under test, T18, to TL, and T18 to TL to measure cup. Refer to "JBT 10368-2014 Hydraulic Throttle Valves" for testing.

[0123] Speed ​​regulating valve test: inlet connected to P30, oil return port connected to T18

[0124] When testing the flow adjustment range and minimum control flow, the impact of inlet pressure changes on the control flow, the impact of outlet pressure changes on the control flow, and the control component adjustment "force" experiment, solenoid b1 is energized, the solenoid reversing valve A4 is in the right position, the ball valve B18 is open, the ball valve A19 is closed, the ball valve C25, the solenoid ball valve A21, the solenoid ball valve B23, the throttle valve A30, the ball valve E45, the solenoid ball valve C46, ​​and the ball valve F49 are closed, and the throttle valve B48 and the ball valve G51 are opened.

[0125] The high pressure oil circuit is:

[0126] P-P4-A-P16-P17-T8-P27-P28-P30;

[0127] The low-pressure oil circuit is:

[0128] T18-P39-P40-P41-T24-P43-P45-T26-P48-P49-T3;

[0129] Refer to "JBT 10366-2014 Hydraulic Speed ​​Control Valve" for testing.

[0130] When testing internal leakage, energize solenoid B1, position solenoid directional valve A4 to the right, open ball valve B18, close ball valve A19, close ball valve C25, solenoid ball valve A21, solenoid ball valve B23, throttle valve A30, ball valve E45, solenoid ball valve C46, ​​and ball valve F49. Open throttle valve B48 and ball valve G51. The high-pressure oil circuit is: P-P4-A-P16-P17-T8-P27-P28-P30. Connect outlet T18 of the test valve to TL, and T18 to TL to a measuring cup. Follow the test procedure in accordance with JBT 10366-2014 Hydraulic Speed ​​Control Valves.

[0131] Gas-liquid pressure relief valve test: main air inlet connected to P65, main air return port connected to T37, air control port connected to Px4, hydraulic control inlet connected to Px3, hydraulic control outlet connected to T38.

[0132] During the opening time test of the gas-liquid pressure relief valve, variable pump 1 is deactivated, ball valve H61 is closed, ball valve I62 is open, and solenoid a2 of solenoid reversing valve B9 is energized, placing solenoid reversing valve B9 in the left position. The proportional pressure reducing valve 59 is set to control the air pressure Px4 according to experimental requirements, and the proportional relief valve B8 is set to control the oil pressure Px3 according to experimental requirements. When the gas-liquid pressure relief valve is closed, Px3 is disconnected from T38, and the pressure applied by the oil pressure at Px3 is greater than the pressure applied by the air pressure at Px4, causing the valve core to close.

[0133] The high-pressure gas path is: P55-P56-P65;

[0134] The control gas path is: P55-P56-P57-T34-P58-P60-T36-P63-P64-T40-Px4;

[0135] The control oil path is: S1-P1-P8-B1-P9; P1-P15-Px3;

[0136] The outlet of the gas-liquid pressure relief valve is connected to the atmosphere. When the gas-liquid pressure relief valve is open, Px3 connects to T38, Px3 releases pressure, and the air pressure at Px4 pushes the valve core open, connecting P65 to T37. By detecting the control oil pressure inside the gas-liquid pressure relief valve, the opening time of the gas-liquid pressure relief valve can be determined.

[0137] Hydraulic oil temperature control:

[0138] When the initial hydraulic oil temperature is too low, the cooling pump starts, ball valves H61, J68, and K69 are closed, and ball valve I62 is opened.

[0139] The hydraulic oil circuit is: S2-P69-P71-T44-tank;

[0140] The gas path is: P55-P56-P57-T34-P58-P60-T36-P63-P64-T40.

[0141] At this time, high-pressure gas is charged into the high-pressure gas tank, causing the temperature of the high-pressure gas tank and the gas inside it to rise. The hydraulic oil exchanges heat with the gas in the high-pressure gas tank, causing the hydraulic oil temperature to rise, achieving the purpose of raising the oil temperature. When the oil temperature reaches the required value, ball valve I62 is closed.

[0142] When the hydraulic oil temperature is too high, ball valves K69 and I62 close, and ball valve J68 opens. The hydraulic oil circuit now follows: S2-P69-P71-T44-tank, and the gas circuit follows: P64-P67-T41-atmosphere. The high-pressure gas tank is depressurized and released to the atmosphere. This lowers the temperature inside the tank, creating heat exchange with the hydraulic oil, lowering the hydraulic oil temperature. When the oil temperature reaches the desired level, ball valve J68 closes. This process reduces the hydraulic oil temperature to below room temperature, enabling testing under low-temperature conditions.

[0143] Accumulator 27 constant pressure control:

[0144] When constant pressure control is required at the inlet of the test valve, accumulator 27 is integrated into the hydraulic system. The air pressure in accumulator 27 is adjusted to the required pressure via proportional pressure reducing valve 59. Ball valves D26 and I62 are closed, while ball valves C25 and H61 are opened. The air pressure path is: P55-P56-P57-T34-P59-T35-P61-P62. When the pressure at inlet P25 of accumulator 27 falls below the air pressure at accumulator 27, the bladder / piston of accumulator 27 moves downward. Simultaneously, since constant pressure gas is continuously entering the air inlet P62 of accumulator 27, the pressure in the accumulator chamber remains constant. The accumulator bladder compresses the line volume, causing the pressure at P25 to rise until the accumulator oil pressure equals the air pressure, thus maintaining constant pressure at the inlet of the test valve. When the pressure at the inlet P25 of accumulator 27 is higher than the air pressure of accumulator 27, the bladder / piston of accumulator 27 moves upward, the volume of the air cavity decreases, and the proportional pressure reducing valve ensures that the pressure in the accumulator air cavity remains unchanged. The accumulator air bladder expands the pipeline volume, causing the P25 pressure to drop until the accumulator oil pressure is equal to the air pressure, thereby ensuring constant pressure at the inlet of the test valve.

[0145] The test bench of the above embodiment, through the integration of electric, hydraulic, and pneumatic elements, effectively combines various hydraulic valve test circuits and gas-liquid pressure relief valve test circuits, and coordinates various special operating condition circuits, enables the test bench to complete the common hydraulic valve and gas-liquid pressure relief valve tests of the main engine manufacturer through simple operation. The test bench of the above embodiment uses various ball valves, solenoid ball valves, reversing valves, throttle valves, and one-way valves to control the oil circuit on and off, enabling the establishment of various test circuits, including circuits for instantaneous ultra-high flow, zero load, and valve inlet and outlet impact conditions, thereby reducing the majority of management disassembly and assembly. The rational arrangement of pressure sensors, temperature sensors, and flow meters allows various testing requirements to be met in various experiments without adding or subtracting sensors.

[0146] In summary, compared with the existing technology, the test bench provided by this application has the following advantages:

[0147] 1. Through the combination of electricity, liquid and gas, the test bench can complete the testing of hydraulic valves with mechanical drive, electric drive (proportional and switch), electro-hydraulic drive, gas-liquid drive and other drive modes.

[0148] 2. The test bench can complete three types of passive loading: throttle valve loading, overflow valve loading, and speed control valve loading.

[0149] 3. The hydraulic valve test circuit can achieve a higher pressure gradient and perform any basic pressure step through the form of double electromagnetic ball valve + overflow valve.

[0150] 4. The high-pressure gas from the high-pressure gas tank is used for intake and exhaust to complete the temperature control of the hydraulic oil. At the same time, the hydraulic oil temperature can be lower than the room temperature, which can meet the requirements of low-temperature working condition testing.

[0151] 5. The accumulator constant pressure control is adopted to meet the constant pressure control of the hydraulic circuit while reducing the heat of the hydraulic system.

[0152] 6. Ultra-low pressure regulation (<1bar) can be achieved.

[0153] 7. Simplify the test circuit, one main oil circuit can complete the test of all hydraulic valves.

[0154] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A valve test bench, characterized in that: It includes hydraulic valve test circuit, gas-liquid pressure relief valve test circuit and control circuit, among which: The hydraulic valve test circuit controls the oil circuit on and off through various ball valves, electromagnetic ball valves, reversing valves, throttle valves, and one-way valves, and can realize the construction of various test circuits to meet the testing of different hydraulic valves to be tested; The gas-liquid pressure relief valve test circuit is used for performance testing of gas-liquid pressure relief valves of different specifications under different working conditions; The output end of the control circuit is provided with a plurality of control oil ports for providing control hydraulic oil of different pressures to the tested hydraulic valve and the tested gas-liquid pressure relief valve under different working conditions; The hydraulic valve test circuit includes a variable pump (1), a safety valve A2, a proportional relief valve A3, an electromagnetic reversing valve A4, a pressure sensor A5, a pressure sensor G17, a ball valve B18, a ball valve A19, a proportional speed regulating valve A20, an electromagnetic ball valve A21, a proportional relief valve C22, an electromagnetic ball valve B23, a proportional relief valve D24, a temperature sensor A28, a pressure sensor H29, a throttle control device, a pressure sensor L32, a throttle valve C33, a flow meter B34, a pressure sensor M35, a pressure sensor N36, a throttle valve D37, a flow meter C38, a pressure sensor O39, a measuring cup with a TL port ( 40), pressure sensor I41, temperature sensor B42, flowmeter A43, pressure sensor J44; ball valve E45, electromagnetic ball valve C46, ​​pressure sensor K47, throttle valve B48, ball valve F49, proportional relief valve E50, ball valve G51, check valve A52, check valve B53, check valve C54, check valve D55, proportional speed regulating valve B56, wherein the oil suction port S of the variable pump (1) is connected to the oil tank, the outlet P of the variable pump (1) is connected to the inlet P2 of the safety valve A2, the inlet P3 of the proportional relief valve A3, and the inlet P4 of the electromagnetic reversing valve A4; the outlet T of the safety valve A2 is connected to the oil tank, the proportional relief valve A3 is connected to the inlet P3 of the electromagnetic reversing valve A4; the outlet T of the safety valve A2 is connected to the oil tank, For example, the outlet T1 of the relief valve A3 is connected to the oil tank, the outlet T2 of the solenoid reversing valve A4 is connected to the oil tank, the working port A of the solenoid reversing valve A4 is connected to the inlet P16 of the pressure sensor G17, the inlet P18 of the ball valve A19, and the inlet P17 of the ball valve B18, the outlet T9 of the ball valve A19 is connected to the inlet P19 of the proportional speed control valve A20, the outlet T10 of the proportional speed control valve A20 is connected to the outlet T8 of the ball valve B18, the inlet P20 of the solenoid ball valve A21, the inlet P22 of the solenoid ball valve B23, the inlet P24 of the ball valve C25, the inlet P27 of the temperature sensor A28, and the inlet P2 of the pressure sensor H29.

8. The inlet P29 of the throttle control device is connected to the inlet P30 of the hydraulic valve (31) to be tested, the outlet T11 of the electromagnetic ball valve A21 is connected to the inlet P21 of the proportional relief valve C22, the outlet T12 of the proportional relief valve C22 is connected to the oil tank, the outlet T13 of the electromagnetic ball valve B23 is connected to the inlet P23 of the proportional relief valve D24, the outlet T14 of the proportional relief valve D24 is connected to the oil tank, the outlet T15 of the ball valve C25 is connected to the oil inlet P25 of the accumulator (27) and the inlet P26 of the ball valve D26, the outlet T16 of the ball valve D26 is connected to the oil tank, and the outlet T17 of the throttle control device is connected to the oil tank; The outlet T18 of the hydraulic valve (31) to be tested is connected to the inlet P39 of the pressure sensor I41, the inlet P40 of the temperature sensor B42, the inlet P42 of the ball valve E45, and the inlet P41 of the flow meter A43. The outlet T23 of the ball valve E45 is connected to the oil tank. The outlet T24 of the flow meter A43 is connected to the inlet P43 of the pressure sensor J44, the inlet P44 of the electromagnetic ball valve C46, ​​the inlet P45 of the throttle valve B48, and the inlet P46 of the ball valve F49. The outlet T27 of the ball valve F49 is connected to the inlet P47 of the proportional relief valve E50. The outlet T28 of the proportional relief valve E50 is connected to the outlet T25 of the electromagnetic ball valve C46. , the outlet T26 of the throttle valve B48, the inlet P48 of the pressure sensor K47, the inlet P49 of the ball valve G51, the inlet P50 of the check valve A52, and the outlet T32 of the check valve C54 are connected, the outlet T39 of the ball valve G51 is connected to the oil tank, the outlet T29 of the check valve A52 is connected to the inlet P52 of the proportional speed control valve B56 and the outlet T30 of the check valve B53, the outlet T31 of the proportional speed control valve B56 is connected to the inlet P53 of the check valve C54 and the inlet P54 of the check valve D55, the outlet T33 of the check valve D55 is connected to the inlet P51 of the check valve B (53) and the working port B of the electromagnetic reversing valve A4; The reversing valve test port A2 is connected to the inlet P31 of the pressure sensor L32 and the inlet P32 of the throttle valve C33, the outlet T19 of the throttle valve C33 is connected to the inlet P33 of the flowmeter B34, and the outlet T20 of the flowmeter B34 is connected to the inlet P37 of the pressure sensor M35 and the reversing valve test port B2; the reversing valve test port A3 is connected to the inlet P34 of the pressure sensor N36 and the inlet P35 of the throttle valve D37, the outlet T21 of the throttle valve D37 is connected to the inlet P36 of the flowmeter C38, and the outlet T22 of the flowmeter C38 is connected to the inlet P38 of the pressure sensor O39 and the reversing valve test port B3.

2. The valve test bench according to claim 1, characterized in that: The throttle control device adopts a throttle valve A30.

3. The valve test bench according to claim 1, characterized in that: The throttling control device adopts a servo proportional valve.

4. The valve test bench according to claim 1, characterized in that: The throttling control device adopts a servo valve.

5. The valve test bench according to claim 1, characterized in that: The gas-liquid pressure relief valve test circuit comprises a high-pressure gas source (57), a pressure sensor P58, a gas-use proportional pressure reducing valve (59), a pressure sensor Q60, a ball valve I62, a pressure sensor S64, a high-pressure gas tank (65), a gas-liquid pressure relief valve (66), a pressure sensor T67, a ball valve J68, and a ball valve K69. The outlet P55 of the high-pressure gas source (57) is connected to the inlet P56 of the pressure sensor P58, the inlet P57 of the gas-use proportional pressure reducing valve (59), and the gas inlet P65 of the gas-liquid pressure relief valve (66) to be tested. The outlet T34 of the gas-use proportional pressure reducing valve (59) is connected to the inlet P58 of the pressure sensor Q60 and the inlet P60 of the ball valve I62. The outlet T36 of the ball valve I62 is connected to the inlet P63 of the pressure sensor S64 and the ball valve The inlet P67 of J68 is connected to the air inlet P64 of the high-pressure gas tank (65), the outlet T41 of the ball valve J68 is connected to the atmosphere, the outlet T40 of the high-pressure gas tank (65) is connected to the inlet P68 of the ball valve K69, the outlet T42 of the ball valve K69 is connected to the pneumatic control port Px4 and the pneumatic control port of the gas-liquid pressure relief valve (66) to be tested, the outlet T37 of the gas-liquid pressure relief valve (66) to be tested is connected to the atmosphere, the oil return port T38 of the gas-liquid pressure relief valve (66) to be tested is connected to the oil tank, and the internal control oil of the gas-liquid pressure relief valve (66) to be tested is connected to the inlet P66 of the pressure sensor T67.

6. The valve test bench according to claim 1, characterized in that: The control circuit includes a control pump (6), a safety valve B7, an electromagnetic reversing valve B9, a pressure sensor B10, a pressure sensor C11, a proportional pressure reducing valve A12, a proportional pressure reducing valve B13, a pressure sensor D14, a pressure sensor E15, and a pressure sensor F16. The oil suction port S1 of the control pump (6) is connected to the oil tank, and the outlet P1 of the control pump (6) is connected to the inlet P6 of the safety valve B7, the inlet P7 of the proportional relief valve B8, the inlet P8 of the electromagnetic reversing valve B9, the inlet P11 of the proportional pressure reducing valve A12, the inlet P12 of the proportional pressure reducing valve B13, and the inlet P16 of the pressure sensor F16.

15. The control oil port Px3 is connected, the outlet T3 of the safety valve B7 is connected to the oil tank, the outlet T4 of the proportional relief valve B8 is connected to the oil tank, the outlet T5 of the solenoid reversing valve B9 is connected to the oil tank, the working port A1 of the solenoid reversing valve B9 is connected to the inlet P9 of the pressure sensor B10, the outlet T6 of the proportional reducing valve A12 is connected to the inlet P13 of the pressure sensor D14 and the control oil port Px1, the outlet T7 of the proportional reducing valve B13 is connected to the inlet P14 of the pressure sensor E15 and the control oil port Px2, and the working port B1 of the solenoid reversing valve B9 is connected to the inlet P10 of the pressure sensor C11.

7. The valve test bench according to claim 6, characterized in that: The invention also includes a temperature control circuit, which includes a cooling pump (70), a safety valve C71, and a temperature-regulating oil tank (72). The inlet S2 of the cooling pump (70) is connected to the oil tank, the outlet P69 of the cooling pump (70) is connected to the inlet P70 of the safety valve C71 and the inlet P71 of the temperature-regulating oil tank (72), the outlet T44 of the temperature-regulating oil tank (72) is connected to the oil tank, and the high-pressure gas tank (65) is inside the temperature-regulating oil tank (72).

8. The valve test bench according to claim 2, characterized in that: The constant pressure control circuit includes a ball valve C25, a ball valve D26, an accumulator (27), a ball valve H61, and a pressure sensor R63. The inlet P59 of the ball valve H61 is connected to the outlet T34 of the gas proportional pressure reducing valve (59). The outlet T35 of the ball valve H61 is connected to the inlet P61 of the pressure sensor R63 and the charging port P62 of the accumulator (27). The oil inlet P25 of the accumulator (27) is connected to the outlet of the ball valve C25. T15 is connected to the inlet P26 of the ball valve D26, the inlet P24 of the ball valve C25 is connected to the outlet T10 of the proportional speed control valve A20, the outlet T8 of the ball valve B18, the inlet P20 of the electromagnetic ball valve A21, the inlet P22 of the electromagnetic ball valve B23, the inlet P27 of the temperature sensor A28, the inlet P28 of the pressure sensor H29, the inlet P29 of the throttling control device, and the inlet P30 of the hydraulic valve 31 to be tested, and the outlet T16 of the ball valve D26 is connected to the oil tank.

Images