A hydraulic pump and hydraulic valve integrated reliability test system

Abstract

The present application relates to a kind of hydraulic pump and hydraulic valve integration reliability test system.The present application includes hydraulic oil tank and at least one test station, each test station is equipped with the hydraulic pump to be measured, the oil inlet of the hydraulic pump to be measured is connected with the hydraulic oil tank, the hydraulic pump to be measured is connected to servo motor;Hydraulic pump loading test loop includes proportional overflow valve and electromagnetic overflow valve respectively connected with the oil outlet of the hydraulic pump to be measured, proportional overflow valve and the electromagnetic overflow valve are connected to the hydraulic oil tank;The oil inlet of the hydraulic valve to be measured is connected with the oil outlet of the hydraulic pump to be measured, and switch valve is arranged between the oil inlet of the hydraulic valve to be measured, and the oil return port of the hydraulic valve to be measured is connected with the hydraulic oil tank;Hydraulic valve loading test loop is connected with the working oil port of the hydraulic valve to be measured and loads pressure to the hydraulic valve to be measured.The present application solves the problem that hydraulic pump valve reliability test bench equipment is independent, test cost is high and sample piece is retested time-consuming and labor-consuming after reliability test is completed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic test, in particular to a hydraulic pump and hydraulic valve integrated reliability test system. BACKGROUND

[0002] The hydraulic pump and hydraulic valve reliability test is an important equipment for verifying the durability of hydraulic components, and is a necessary equipment for the development of hydraulic elements. Compared with the type test bench for performance test, the reliability test equipment focuses on durability, and the test items are less. The hydraulic pump and hydraulic valve reliability test equipment is mainly used for pressure test of the measured components, and strives to be simple and reliable, and low in cost.

[0003] The hydraulic pump and valve reliability test bench is mainly used for pressure durability reliability test of the hydraulic pump and valve. At present, the two devices are independent in most of the devices on the market, the hydraulic pump reliability test bench only tests the hydraulic pump, and the hydraulic valve reliability test bench only tests the hydraulic valve. If simultaneous test is required, two devices are required, and the same modules of the two devices are overlapped, the cost is high, which causes unnecessary waste, and the site occupies a large area, the power distribution cost is high, and the test equipment investment is high.

[0004] The reliability test lasts for a long time, for example, the hydraulic pump is generally 100 million times of impact and 1000h of alternating speed (the speed and pressure of the hydraulic pump can be adjusted), and the hydraulic valve is more than 100 million times, which lasts for a long time, occupies many resources, and needs to obtain more test stations at a lower cost.

[0005] Most of the existing reliability equipment only performs reliability durability test, and needs to be taken to the performance test bench for performance retest after the test or during the test, which needs to invest more manpower cost for disassembling and assembling the sample, and may need to wait for the test resources of the performance test bench. SUMMARY

[0006] Therefore, the technical problem to be solved by the present application is to overcome the problems of independent hydraulic pump and valve reliability test bench equipment, high test cost and long time and labor consumption for sample retest after the reliability test.

[0007] To solve the above technical problems, the present application provides a hydraulic pump and hydraulic valve integrated reliability test system, which comprises a hydraulic oil tank and at least one test station, each test station is provided with;

[0008] The measured hydraulic pump is connected to the servo motor.

[0009] The hydraulic pump loading test circuit comprises a proportional overflow valve and an electromagnetic overflow valve connected to the oil outlet of the hydraulic pump to be tested respectively, and the proportional overflow valve and the electromagnetic overflow valve are connected to the hydraulic oil tank.

[0010] The hydraulic valve to be tested is provided with a switch valve between the oil inlet of the hydraulic valve to be tested and the oil outlet of the hydraulic pump to be tested, and the oil return port of the hydraulic valve to be tested is connected to the hydraulic oil tank.

[0011] The hydraulic valve loading test circuit is connected to the working oil port of the hydraulic valve to be tested and loads the hydraulic valve to be tested.

[0012] The oil outlet of the hydraulic pump to be tested is pressurized and unloaded by the electromagnetic overflow valve.

[0013] The hydraulic pump to be tested is driven to rotate by the different rotating speeds of the adjusting servo motor, and the pressure of the oil outlet of the hydraulic pump to be tested is changed by the different analog voltage signals of the proportional overflow valve.

[0014] The flow into the hydraulic valve to be tested is changed by the rotating speed of the hydraulic pump to be tested, and the highest test safety pressure of the hydraulic valve to be tested is adjusted by the electromagnetic overflow valve.

[0015] In an embodiment of the present application, the reliability test system further comprises:

[0016] The circulating cooling circuit is used for extracting hydraulic oil from the hydraulic oil tank, cooling and filtering, and then flowing back to the hydraulic oil tank.

[0017] In an embodiment of the present application, the reliability test system further comprises:

[0018] The oil leakage recovery circuit is used for collecting and filtering the oil leaked by the hydraulic pump to be tested and the hydraulic valve to be tested during the test, and then flowing back to the hydraulic oil tank.

[0019] In an embodiment of the present application, the hydraulic oil tank and the oil inlet of the hydraulic pump to be tested are further connected with a first oil suction filter and an oil suction ball valve in sequence.

[0020] In an embodiment of the present application, the oil outlet of the hydraulic pump to be tested and the proportional overflow valve are connected with a first electric ball valve and a high-pressure filter in sequence, the oil outlet of the hydraulic pump to be tested and the electromagnetic overflow valve are connected with a second electric ball valve, the proportional overflow valve and the hydraulic oil tank are connected with a first oil return filter, and the switch valve comprises a high-pressure ball valve with a position switch.

[0021] In an embodiment of the present application, the circulating cooling circuit comprises, in sequence, a cooling oil outlet end of the hydraulic oil tank, a second oil suction filter, a manual butterfly valve, a cooling motor pump set, a water cooler, a second oil return filter, and a cooling oil return end of the hydraulic oil tank, the water cooler comprises a plate cooler, the cooling motor pump set comprises a cooling hydraulic pump and a cooling drive motor connected to the cooling hydraulic pump, an electric proportional butterfly valve is connected to a water inlet of the water cooler, and a water outlet of the water cooler is connected to a cooling water tower.

[0022] In an embodiment of the present application, the oil leakage recovery circuit comprises, in sequence, an oil leakage recovery tank, a third oil suction filter, an oil leakage recovery motor pump set, a pipeline filter, a third oil return filter, and the hydraulic oil tank, the oil leakage recovery tank is a hydraulic pump waste oil tank or a hydraulic valve oil leakage tank.

[0023] In an embodiment of the present application, the reliability test system further comprises an electric control system and a sensor acquisition system, the electric control system is connected to the sensor acquisition system, the hydraulic pump loading test circuit, and the hydraulic valve loading test circuit, the sensor acquisition system comprises a pressure sensor, a liquid temperature sensor, a liquid level sensor, a tuning fork liquid level switch, a smoke sensor, and a flow meter, the pressure sensor is connected to an oil outlet of the measured hydraulic pump, the flow meter is arranged between a high-pressure filter and the proportional overflow valve, the liquid temperature sensor, the liquid level sensor, and the tuning fork liquid level switch are respectively connected to the hydraulic oil tank, and the smoke sensor is connected to a side of the measured hydraulic pump and used for detecting smoke generated by the measured hydraulic pump due to high temperature.

[0024] In an embodiment of the present application, the sensor acquisition system further comprises a micro flow meter, and the micro flow meter is connected to a leakage interface of the measured hydraulic valve.

[0025] In an embodiment of the present application, the hydraulic valve loading test circuit comprises a bridge loading circuit or a throttling loading circuit.

[0026] The above technical solution of the present application has the following advantages compared with the prior art:

[0027] The hydraulic pump and hydraulic valve integrated reliability test system can meet the reliability test flow requirements of hydraulic valves with a wider flow range, because the upper limit of the required flow and the pressure of different hydraulic valves are different, the hydraulic pump can be replaced to meet the requirements of a wider flow range; the test system can be used for hydraulic pump testing, can be applied to pumps of various specifications, meets the requirement of quickly replacing the test system configuration, and reduces the cost.

[0028] The application has multiple perfect safety protection functions, since the reliability test working condition is harsh, the test time is long, basically 24h operation without stop, the requirement for the equipment reliability is high, and various abnormal conditions possibly existing in the test are comprehensively considered, the application can stop at the first time when the abnormality occurs through various sensor collection and monitoring, and the safety is improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to make the content of the application more easily and clearly understood, the application is further described in detail below according to the specific embodiments of the application and in combination with the drawings.

[0030] Figure 1 is a schematic diagram of the overall composition of the integrated reliability test system of the application.

[0031] Figure 2 is a schematic diagram of the partial structure of the integrated reliability test system of the application.

[0032] Figure 3 is a schematic diagram of the structure of the integrated reliability test system of the application.

[0033] Figure 4 is a schematic diagram of the structure of the circulating cooling circuit of the application.

[0034] Figure 5 is a schematic diagram of the structure of the oil leakage recovery circuit of the application.

[0035] Explanation of the reference signs in the drawings of the specification:

[0036] 100, hydraulic pump loading test circuit; 200, hydraulic valve loading test circuit; 300, circulating cooling circuit; 400, oil leakage recovery circuit; 500, sensor collection system;

[0037] 1, first oil suction filter; 2, oil suction ball valve; 3, measured hydraulic pump; 4, servo motor; 5a, first electric ball valve; 5b, second electric ball valve; 6, pressure sensor; 7, electromagnetic overflow valve; 8, high-pressure filter; 9, flowmeter;

[0038] 10, proportional overflow valve; 11, first oil return filter; 12, on-off valve; 13, bridge loading circuit; 13a, one-way valve; 13b, proportional electromagnetic overflow valve; 14, throttling loading circuit; 14a, first one-way throttling valve; 14b, second one-way throttling valve; 15, cooling hydraulic pump; 16, cooling driving motor; 17, manual butterfly valve; 18, second oil suction filter; 19, water cooler;

[0039] 20, electric proportional butterfly valve; 21, second oil return filter; 22, third oil suction filter; 23, hydraulic pump waste oil tank; 24, hydraulic valve oil leakage tank; 25, oil leakage recovery motor; 26, oil leakage recovery pump; 27, pipeline filter; 28, third oil return filter; 29, micro flow meter;

[0040] 30, hydraulic oil tank; 31, liquid level sensor; 32, liquid temperature sensor; 33, tuning fork liquid level switch; 34, electric control system; 35, measured hydraulic valve; 36, smoke sensor. DETAILED DESCRIPTION

[0041] The present application will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present application and implement it, but the embodiments are not as a limitation on the present application.

[0042] In the present application, if the direction (up, down, left, right, front and back) is described, it is only for the convenience of describing the technical solution of the present application, and is not indicative or suggestive of the technical features indicated must have a specific orientation, structure and operation in a specific orientation, therefore, cannot be understood as a limitation on the present application.

[0043] In the present application, the meaning of "several" is one or more, the meaning of "multiple" is two or more, "greater than" "less than" "more than" and the like are not included in the number; "above" "below" "within" and the like are understood to include the number. In the description of the present application, if the "first" "second" is described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicative or suggestive of relative importance or implicit indication of the number of indicated technical features or implicit indication of the order of indicated technical features.

[0044] In the present application, unless otherwise explicitly limited, the words "set", "install", "connect" and the like should be broadly understood, for example, can be directly connected, can be indirectly connected through an intermediate medium; can be fixedly connected, can be detachably connected, can be integrally formed; can be mechanically connected, can be electrically connected or can communicate with each other; can be the communication or interaction relationship between two elements. The skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0045] Reference Figures 1 to 5 As shown in the drawings, the hydraulic pump and hydraulic valve integrated reliability test system of the present application comprises a hydraulic oil tank 30 and at least one test station, each test station is provided with;

[0046] The measured hydraulic pump 3 is connected to the hydraulic oil tank 30 through the oil inlet, and the measured hydraulic pump 3 is connected to the servo motor 4.

[0047] The hydraulic pump loading test circuit 100 comprises a proportional overflow valve 10 and an electromagnetic overflow valve 7 connected to the oil outlet of the tested hydraulic pump 3 respectively, and the proportional overflow valve 10 and the electromagnetic overflow valve 7 are connected to the hydraulic oil tank 30;

[0048] The tested hydraulic valve 35 is provided with a switch valve 12 between the oil inlet P of the tested hydraulic valve 35 and the oil outlet of the tested hydraulic pump 3, and the oil return port T of the tested hydraulic valve 35 is connected to the hydraulic oil tank 30;

[0049] The hydraulic valve loading test circuit 200 is connected to the working oil port (A, B; A1, B1; A2, B2…) of the tested hydraulic valve 35 and loads pressure on the tested hydraulic valve 35;

[0050] The oil outlet of the tested hydraulic pump 3 is pressurized and unloaded by the electromagnetic overflow valve 7;

[0051] The tested hydraulic pump 3 is rotated by the different rotating speeds of the adjusting servo motor 4, and the pressure of the oil outlet of the tested hydraulic pump 3 is changed by the different analog voltage signals of the proportional overflow valve 10;

[0052] The flow into the tested hydraulic valve 35 is changed by the rotating speed of the tested hydraulic pump 3, and the highest test safety pressure of the tested hydraulic valve 35 is adjusted by the electromagnetic overflow valve 7.

[0053] According to specific requirements, a plurality of test stations can be arranged above the hydraulic oil tank 30 on the workbench, and the embodiment is a schematic view of two test stations.

[0054] Since the tested hydraulic pump 3 and the tested hydraulic valve 35 can be loaded by overflow during the reliability test process, the hydraulic energy can be converted into heat energy to heat the hydraulic oil, and a large amount of heat will be generated, therefore, the reliability test system is also provided with a circulating cooling circuit 300 for extracting hydraulic oil from the hydraulic oil tank 30 and cooling and filtering the hydraulic oil and then flowing back to the hydraulic oil tank 30.

[0055] Since excess leakage oil is inevitably generated during the reliability test process and the disassembly and assembly process of the tested hydraulic pump 3 and the tested hydraulic valve 35, the reliability test system is also provided with an oil leakage recovery circuit 400 for collecting and filtering the oil leaked by the tested hydraulic pump 3 and the tested hydraulic valve 35 during the test process and then flowing back to the hydraulic oil tank 30.

[0056] Specifically, the hydraulic oil tank 30 and the oil inlet of the tested hydraulic pump 3 are further connected with a first oil suction filter 1 and an oil suction ball valve 2 in sequence.

[0057] Specifically, the oil outlet of the measured hydraulic pump 3 is connected with the proportional overflow valve 10 in sequence through a first electric ball valve 5a and a high-pressure filter 8, the oil outlet of the measured hydraulic pump 3 is connected with the electromagnetic overflow valve 7 through a second electric ball valve 5b, the proportional overflow valve 10 is connected with the hydraulic oil tank 30 through a first return oil filter 11, and the switch valve 12 comprises a high-pressure ball valve with a position switch.

[0058] Specifically, the circulating cooling circuit 300 comprises, in sequence, a cooling oil outlet end of the hydraulic oil tank 30, a second oil suction filter 18, a manual butterfly valve 17, a cooling motor pump set, a water cooler 19, a second return oil filter 21 and a cooling oil return end of the hydraulic oil tank 30, the water cooler 19 comprises a plate cooler, the cooling motor pump set comprises a cooling hydraulic pump 15 and a cooling driving motor 16 connected with the cooling hydraulic pump 15, the water inlet of the water cooler 19 is connected with an electric proportional butterfly valve 20, and the water outlet of the water cooler 19 is connected to a cooling water tower. The high-temperature hydraulic oil is extracted from the hydraulic oil tank 30 by the cooling motor pump set, passes through the plate cooler, is cooled by indirect heat exchange between the hydraulic oil circuit and the water circuit, and achieves the purpose of heat dissipation.

[0059] Specifically, the oil leakage recovery circuit 400 comprises, in sequence, an oil leakage recovery tank, a third oil suction filter 22, an oil leakage recovery motor pump set (comprising an oil leakage recovery motor 25 and an oil leakage recovery pump 26), a pipeline filter 27, a third return oil filter 28 and the hydraulic oil tank 30, and the oil leakage recovery tank is a hydraulic pump waste oil tank 23 or a hydraulic valve oil leakage tank 24. The oil is collected in the hydraulic pump waste oil tank 23 or the hydraulic valve oil leakage tank 24 through the workbench, is then extracted by the oil leakage recovery motor pump set, and is recovered into the hydraulic oil tank 30 through the pipeline filter 27 and the return oil filter. In the embodiment, two hydraulic pump waste oil tanks 23 and one hydraulic valve oil leakage tank 24 are arranged on the same horizontal plane, the oil levels of the three oil tanks are consistent according to the principle of communicating vessels, and only one oil leakage recovery motor pump set is needed to extract and filter the oil in the three oil tanks at the same time, thereby saving the cost.

[0060] Specifically, the reliability test system further comprises an electric control system 34 and a sensor acquisition system 500, the electric control system 34 is connected with the sensor acquisition system 500, the hydraulic pump loading test loop 100 and the hydraulic valve loading test loop 200, the sensor acquisition system 500 comprises a pressure sensor 6, a liquid temperature sensor 32, a liquid level sensor 31, a tuning fork liquid level switch 33, a smoke sensor 36 and a flow meter 9, the pressure sensor 6 is connected to an oil outlet of the measured hydraulic pump 3, the flow meter 9 is arranged between the high-pressure filter 8 and the proportional overflow valve 10, the liquid temperature sensor 32, the liquid level sensor 31 and the tuning fork liquid level switch 33 are respectively connected to the hydraulic oil tank 30, and the smoke sensor 36 is connected to the side of the measured hydraulic pump 3 and is used for detecting smoke generated by the measured hydraulic pump 3 due to high temperature.

[0061] Since the reliability test condition is harsh, the test time is long, the equipment is required to be in operation for 24 hours without stop, the reliability of the equipment is high, and various abnormal conditions that may exist in the test are comprehensively considered, the above setting can be used for judging abnormal conditions in the test, when the electric control system 34 collects pressure or flow that deviates from the set value by more than four cycles, it is considered that the test piece or the equipment is damaged; when the oil temperature is too high, the test requirement is not met, the electric control system 34 can control shutdown; when abnormal oil leakage and oil injection occur in the test process, the liquid level sensor 31, the tuning fork liquid level sensor 31 and the smoke sensor 36 send signals to the electric control system 34 to stop and improve safety.

[0062] Specifically, the sensor acquisition system 500 further comprises a micro flow meter 29, and the micro flow meter 29 is connected to a leakage interface of the measured hydraulic valve 35.

[0063] Specifically, the hydraulic valve loading test loop 200 comprises a bridge loading loop 13 or a throttling loading loop 14. The bridge loading loop 13 comprises four one-way valves 13a and a proportional electromagnetic overflow valve 13b, the four one-way valves are connected in sequence and connected with the proportional electromagnetic overflow valve 7 and the first working port A and the second working port B of the measured hydraulic valve 35; the throttling loading loop 14 comprises two one-way throttling valves (a first one-way throttling valve 14a and a second one-way throttling valve 14b), the first working port A of the measured hydraulic valve 35 is connected in sequence with the first one-way throttling valve 14a, the second one-way throttling valve 14b and the first working port B.

[0064] When the reliability test of the hydraulic pump 3 under test is performed, the on-off valve 12 connected to the hydraulic pump 3 under test is closed, and the closing signal of the on-off valve 12 is fed back to the electric control system 34. Only when the on-off valve 12 is closed in place, the reliability test of the hydraulic pump 3 under test can be started. The hydraulic pump reliability test is divided into impact test and alternating speed test. The impact test is to pressurize and unload the oil outlet of the hydraulic pump 3 under test through the electromagnetic overflow valve 7. When the electromagnetic overflow valve 7 is not powered, the hydraulic pump 3 under test sucks oil from the hydraulic oil tank 30 through the first oil suction filter 1 and the oil suction ball valve 2, and the pressure is adjusted to the set pressure through the electromagnetic overflow valve 7. When the electromagnetic overflow valve 7 is powered, the pressure of the hydraulic pump 3 under test is unloaded, and the pressure is reduced to 0. The electric control system 34 controls the power-on and power-off time of the electromagnetic overflow valve 7, so as to realize the load square wave of the oil outlet of the hydraulic pump 3 under test. When the impact test is performed, the speed of the hydraulic pump 3 under test is controlled to be fixed by the electric control system 34. When the alternating speed test is performed, the hydraulic pump 3 under test needs to be tested in combination with different speeds and different outlet pressures. The electric control system 34 controls the servo motor 4 to adjust different hydraulic pump speeds and controls the proportional overflow valve 10 to adjust different pressures for testing. The flow rate during the hydraulic pump test is collected by the flowmeter 9, and the flow rate during the hydraulic pump test is monitored to find out whether the hydraulic pump 3 under test is abnormally worn to cause the flow rate to decrease during the reliability test. In addition, the wear of the hydraulic pump after impact can also be detected.

[0065] When the servo motor 4 drives the hydraulic pump 3 under test to suck oil from the hydraulic oil tank 30, the hydraulic pump 3 under test is loaded by the electromagnetic overflow valve 7 or the proportional overflow valve 10 at the oil outlet. According to different loading methods, it is divided into impact test and alternating speed test.

[0066] Impact test: the oil outlet of the hydraulic pump 3 under test is pressurized and unloaded by the electromagnetic overflow valve 7. When the electromagnetic overflow valve 7 is not powered, the hydraulic pump 3 under test sucks oil from the hydraulic oil tank 30 through the first oil suction filter 1 and the oil suction ball valve 2, and the pressure is adjusted to the set pressure through the electromagnetic overflow valve 7. When the electromagnetic overflow valve 7 is powered, the pressure of the hydraulic pump 3 under test is unloaded, and the pressure is reduced to 0. The electric control system 34 controls the power-on and power-off time of the electromagnetic overflow valve 7, so as to realize the load square wave of the oil outlet of the hydraulic pump 3 under test. When the impact test is performed, the speed of the hydraulic pump 3 under test is controlled to be fixed by the electric control system 34. When the alternating speed test is performed, the hydraulic pump 3 under test needs to be tested in combination with different speeds and different outlet pressures. The electric control system 34 controls the servo motor 4 to adjust different hydraulic pump speeds and controls the proportional overflow valve 10 to adjust different pressures for testing. The flow rate during the hydraulic pump test is collected by the flowmeter 9, and the flow rate during the hydraulic pump test is monitored to find out whether the hydraulic pump 3 under test is abnormally worn to cause the flow rate to decrease during the reliability test. In addition, the wear of the hydraulic pump after impact can also be detected.

[0067] Alternating speed test: This is to simulate the use of the hydraulic pump 3, the actual use of the speed, pressure is constantly changing according to the machine work requirements. The electric control system 34 by adjusting the different speed of the servo motor 4 to drive the measured hydraulic pump 3 rotation, while the electric control system 34 to give the proportional relief valve 10 different analog voltage signal to change the measured hydraulic pump 3 outlet pressure, to achieve the measured hydraulic pump 3 pressure speed is constantly changing, through the pressure closed loop function of the servo motor 4 can also be pressure maintaining condition adjustment. In the alternating speed test, the flow rate is measured by flow meter 9, high pressure filter 8 is used to filter the proportional relief valve 10 and flow meter 9 protection, to prevent the measured hydraulic pump 3 or the impurities in the hydraulic oil tank 30 into the flow meter 9 and proportional relief valve 10 caused by the element wear, jam.

[0068] The measured hydraulic valve 35 test reliability test, mainly set into the measured hydraulic valve 35 flow and set the measured hydraulic valve 35 safety pressure, the flow rate is adjusted by driving the electric control system 34 to change the speed of the measured hydraulic pump 3 to achieve (flow = speed * pump displacement), the switch valve 12 is opened, the measured hydraulic valve 35 inlet is connected, the second electric ball valve 5b is opened, the electromagnetic relief valve 7 is not powered, the electromagnetic relief valve 7 is used for safety pressure protection when the measured hydraulic valve 35 reliability test, the highest safety pressure in the test circuit of the measured hydraulic valve 35 can be adjusted by the adjustment knob of the electromagnetic relief valve 7, the electric control system 34 to the measured hydraulic valve 35 is on, off to realize the durability test of the measured hydraulic valve 35 (according to the different requirements of the measured hydraulic valve 35 test can design different test tooling), the loading pressure of the measured hydraulic valve 35 is adjusted by the bridge type loading circuit 13 or the throttle loading circuit 14. When the measured hydraulic valve 35 is tested, the switch valve 12 is opened, at this time, the impact test and alternating speed test of the measured hydraulic pump 3 can be closed, when the measured hydraulic valve 35 is tested, the size of the measured hydraulic pump 3 can be replaced according to the required flow range of the measured hydraulic valve 35, to meet the different and wider flow requirements of the measured hydraulic valve 35.

[0069] Since the reliability test of the hydraulic valve 35 or the hydraulic pump 3 needs to control the oil temperature, ensure the oil temperature in a certain temperature range, such as 50±4℃, initially, the proportional overflow valve 10 in the circuit of the hydraulic pump 3 can be used for overflow heating (the oil generates heat when the hydraulic pump is pressurized and overflowed), after heating to the required temperature range, the temperature of the hydraulic oil tank 30 is controlled through the circulating cooling circuit 300 (water cooling), when the actual oil temperature of the hydraulic oil tank 30 does not reach the set oil temperature, the electric proportional butterfly valve 20 is opened or closed with a small opening degree, so that the oil temperature is in the rising period, when the actual oil temperature reaches the set oil temperature, the electric proportional butterfly valve 20 starts to open or works with a larger opening degree, increases the water inlet of the water cooler 19, and speeds up the oil temperature cooling, through the control of the electric control system 34, the temperature of the hydraulic oil tank 30 is controlled in the specified test temperature range.

[0070] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the examples, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A hydraulic pump and hydraulic valve integrated reliability test system, characterized in that, It includes a hydraulic oil tank (30) and at least one test station, each of which is equipped with; The hydraulic pump under test (3) has its inlet connected to the hydraulic oil tank (30) and is connected to the servo motor (4). The hydraulic pump loading test circuit (100) includes a proportional relief valve (10) and an electromagnetic relief valve (7) respectively connected to the oil outlet of the hydraulic pump (3) under test. The proportional relief valve (10) and the electromagnetic relief valve (7) are connected to the hydraulic oil tank (30). The hydraulic valve under test (35) is provided with a switching valve (12) between the oil inlet of the hydraulic valve under test (35) and the oil outlet of the hydraulic pump under test (3), and the oil return port of the hydraulic valve under test (35) is connected to the hydraulic oil tank (30). The hydraulic valve loading test circuit (200) is connected to the working oil port of the hydraulic valve (35) under test and applies pressure to the hydraulic valve (35) under test. The electromagnetic overflow valve (7) is used to pressurize and unload the oil outlet of the hydraulic pump (3) under test. Among them, by adjusting the different speeds of the servo motor (4) to drive the hydraulic pump (3) under test to rotate, and by giving the proportional relief valve (10) different analog voltage signals to change the oil outlet pressure of the hydraulic pump (3) under test; The flow rate into the hydraulic valve (35) is changed by adjusting the rotation speed of the hydraulic pump (3) under test, and the maximum test safety pressure of the hydraulic valve (35) under test is adjusted by the electromagnetic relief valve (7). When the reliability test of the hydraulic pump (3) under test is carried out, the switch valve (12) connected to the hydraulic valve (35) under test is closed; the reliability test of the hydraulic pump is divided into impact test and alternating speed test. The impact test is to pressurize and unload the oil outlet of the hydraulic pump (3) under test through the electromagnetic relief valve (7). When conducting alternating speed tests, the hydraulic pump under test (3) needs to be tested in combination with different speeds and different outlet pressures. The electronic control system (34) simultaneously controls the servo motor (4) to adjust different hydraulic pump speeds and controls the proportional relief valve (10) to adjust different pressures for testing. When the servo motor (4) drives the hydraulic pump under test (3) to draw oil from the hydraulic oil tank (30), the hydraulic pump under test (3) is loaded at the outlet of the hydraulic pump under test (3) through the electromagnetic relief valve (7) or the proportional relief valve (10). According to the different loading methods, it is divided into impact test and alternating speed test. The test hydraulic pump (3) is pressurized and unloaded through the electromagnetic relief valve (7). When the electromagnetic relief valve (7) is not energized, the test hydraulic pump (3) draws oil from the hydraulic oil tank (30) and adjusts the pressure to the set pressure through the electromagnetic relief valve (7). When the electromagnetic relief valve (7) is energized, the test hydraulic pump (3) is unloaded and the pressure drops to 0. The electrical control system (34) controls the energization and de-energization time of the electromagnetic relief valve (7) to realize the square wave loading of the load at the outlet of the test hydraulic pump (3). Alternating speed test: the electric control system (34) drives the measured hydraulic pump (3) to rotate by adjusting the different rotating speeds of the servo motor (4), and the electric control system (34) gives different analog voltage signals to the proportional overflow valve (10) to change the outlet pressure of the measured hydraulic pump (3), so that the pressure and speed of the measured hydraulic pump (3) are constantly changing, and the pressure closed loop function of the servo motor (4) can also be used for pressure maintaining condition adjustment; When the reliability test of the measured hydraulic valve (35) is performed, the flow rate flowing into the measured hydraulic valve (35) is set, and the safety pressure of the measured hydraulic valve (35) is set, and the flow rate is adjusted by driving the electric control system (34) to change the rotating speed of the measured hydraulic pump (3); The electromagnetic overflow valve (7) is used for safety pressure protection during the reliability test of the measured hydraulic valve (35), the highest safety pressure in the test circuit of the measured hydraulic valve (35) can be adjusted by adjusting the knob of the electromagnetic overflow valve (7), the electric control system (34) is used for on-off control of the measured hydraulic valve (35) to realize the durability test of the measured hydraulic valve (35), and the loading pressure of the measured hydraulic valve (35) is adjusted through the bridge type loading circuit (13) or the throttling loading circuit (14).

2. The hydraulic pump and hydraulic valve integrated reliability test system according to claim 1, characterized in that, The reliability test system further comprises: A circulating cooling circuit (300) is arranged for extracting hydraulic oil from the hydraulic oil tank (30) and flowing back to the hydraulic oil tank (30) after cooling and filtering.

3. The hydraulic pump and hydraulic valve integrated reliability test system according to claim 1, characterized in that, The reliability test system further comprises: An oil leakage recovery circuit (400) is arranged for collecting and filtering the oil leaked by the measured hydraulic pump (3) and the measured hydraulic valve (35) during the test and flowing back to the hydraulic oil tank (30).

4. The hydraulic pump and hydraulic valve integrated reliability test system according to claim 1, characterized in that, The hydraulic oil tank (30) is connected with the oil inlet of the measured hydraulic pump (3) in sequence and further connected with a first oil suction filter (1) and an oil suction ball valve (2).

5. The hydraulic pump and hydraulic valve integrated reliability test system according to claim 1, wherein, The outlet of the measured hydraulic pump (3) is connected with the proportional overflow valve (10) in sequence and further connected with a first electric ball valve (5a) and a high-pressure filter (8), the outlet of the measured hydraulic pump (3) is connected with the electromagnetic overflow valve (7) and further connected with a second electric ball valve (5b), the proportional overflow valve (10) is connected with the hydraulic oil tank (30) and further connected with a first oil return filter (11), and the switch valve (12) comprises a high-pressure ball valve with a position switch.

6. The hydraulic pump and hydraulic valve integrated reliability test system according to claim 2, characterized in that, The circulating cooling circuit (300) comprises a cooling oil outlet end of the hydraulic oil tank (30), a second oil suction filter (18), a manual butterfly valve (17), a cooling motor pump set, a water cooler (19), a second oil return filter (21) and a cooling oil return end of the hydraulic oil tank (30) connected in sequence, the water cooler (19) comprises a plate cooler, the cooling motor pump set comprises a cooling hydraulic pump (15) and a cooling drive motor (16) connected with the cooling hydraulic pump (15), a water inlet of the water cooler (19) is connected with an electric proportional butterfly valve (20), and a water outlet of the water cooler (19) is connected to a cooling water tower.

7. The hydraulic pump and hydraulic valve integrated reliability test system according to claim 3, characterized in that, The oil leakage recovery circuit (400) comprises, in sequence, an oil leakage recovery tank, a third oil suction filter (22), an oil leakage recovery motor pump group, a pipeline filter (27), a third oil return filter (28) and the hydraulic oil tank (30), and the oil leakage recovery tank is a hydraulic pump waste oil tank (23) or a hydraulic valve oil leakage tank (24).

8. The hydraulic pump and hydraulic valve integrated reliability test system according to claim 1, characterized in that, The reliability test system further comprises an electric control system (34) and a sensor acquisition system (500), the electric control system (34) is connected with the sensor acquisition system (500), the hydraulic pump loading test circuit (100) and the hydraulic valve loading test circuit (200), and the sensor acquisition system (500) comprises a pressure sensor (6), a liquid temperature sensor (32), a liquid level sensor (31), a tuning fork liquid level switch (33), a smoke sensor (36) and a flowmeter (9), the pressure sensor (6) is connected to an oil outlet of the measured hydraulic pump (3), the flowmeter (9) is arranged between a high-pressure filter (8) and the proportional overflow valve (10), the liquid temperature sensor (32), the liquid level sensor (31) and the tuning fork liquid level switch (33) are connected to the hydraulic oil tank (30) respectively, and the smoke sensor (36) is connected to the side of the measured hydraulic pump (3) and is used for detecting smoke generated by the measured hydraulic pump (3) due to high temperature.

9. The hydraulic pump and hydraulic valve integrated reliability test system according to claim 8, characterized in that, The sensor acquisition system (500) further comprises a micro flowmeter (29), and the micro flowmeter (29) is connected to a leakage interface of the measured hydraulic valve (35).

10. The hydraulic pump and hydraulic valve integrated reliability test system according to claim 1, characterized in that, The hydraulic valve loading test circuit (200) comprises a bridge loading circuit (13) or a throttling loading circuit (14).

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