Hydraulic accessory comprehensive test platform

Abstract

The utility model discloses a comprehensive test platform for hydraulic accessories, and belongs to the technical field of hydraulic oil sources. Comprising a hydraulic pump station, the hydraulic pump station is connected with a control cabinet, and the hydraulic pump station comprises a shared oil tank, a first electric pump pressure supply system and a second electric pump pressure supply system; the shared oil tank is connected with the first electric pump pressure supply system and the second electric pump pressure supply system; the first electric pump pressure supply system and the second electric pump pressure supply system are different in displacement and pressure; a plunger pump is controlled through a motor, a pressure source is provided, then a proportional pressure regulating valve of a control cabinet is used for regulating the pressure to preset pressure, a connector on the control cabinet is connected with a tested hydraulic accessory through a hydraulic hose, and performance parameters of the tested hydraulic accessory are tested. The device can provide multiple groups of adjustable oil supply output, pressure supply monitoring, system flow detection, pressure reduction output, reversing output, oil leakage test, air tightness test and other functions for a tested hydraulic accessory, and can be used for common hydraulic accessory function test requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic oil sources, in particular to a comprehensive test platform for hydraulic accessories. Background Technique

[0002] In the daily maintenance and upkeep of hydraulic accessories, providing a stable oil supply pressure and flow rate for the hydraulic accessories, as well as real-time monitoring of the oil supply pressure and flow rate, is a very important step. However, the entire pressure supply system is generally very large in volume. Different functional hydraulic accessories have different requirements for oil supply pressure, oil supply flow rate, and other test requirements during daily maintenance and upkeep. It is very difficult for existing test platforms to meet these requirements simultaneously. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a comprehensive test platform for hydraulic accessories.

[0004] The purpose of the utility model is achieved through the following technical solutions: A comprehensive test platform for hydraulic accessories, including a hydraulic pump station, the hydraulic pump station is connected to a control cabinet. The hydraulic pump station includes a common oil tank, a system electrical interface, a system return oil filter, a system heat dissipation module, a system return oil interface, a first electric pump pressure supply system, and a second electric pump pressure supply system; the system return oil interface is connected to the system heat dissipation module, the system heat dissipation module is connected to the system return oil filter, the system return oil filter is connected to the common oil tank, the common oil tank is connected to the first electric pump pressure supply system and the second electric pump pressure supply system, and the first electric pump pressure supply system and the second electric pump pressure supply system are connected to the system electrical interface; the displacement and pressure of the first electric pump pressure supply system and the second electric pump pressure supply system are different;

[0005] The first electric pump pressure supply system includes a first suction oil filter, a first three-phase motor and a fixed-displacement piston pump, a first pressure gauge, a first outlet oil filter, a second outlet oil filter, a first accumulator, and a first oil supply interface; the first suction oil filter is connected to the first three-phase motor and the fixed-displacement piston pump; the first three-phase motor and the fixed-displacement piston pump are connected to the first pressure gauge, the first outlet oil filter, and the system electrical interface; the first outlet oil filter is connected to the second outlet oil filter; the second outlet oil filter is connected to the first accumulator; the first accumulator is connected to the first oil supply interface;

[0006] The second electric pump pressure supply system includes a second suction oil filter, a second three-phase motor, a variable piston pump, a second pressure gauge, a third outlet oil filter, a fourth outlet oil filter, a second accumulator, and a second oil supply interface; the second suction oil filter is connected to the second three-phase motor and the variable piston pump; the second three-phase motor and the fixed displacement piston pump are connected to the second pressure gauge, the third outlet oil filter, and the system electrical interface; the third outlet oil filter is connected to the fourth outlet oil filter; the fourth outlet oil filter is connected to the second accumulator; the second accumulator is connected to the second oil supply interface;

[0007] The fixed displacement piston pump is controlled by the first three-phase motor and / or the variable piston pump is controlled by the second three-phase motor to provide a pressure source, and then the proportional pressure regulating valve of the control cabinet is used to adjust it to the preset pressure, and the interface on the control cabinet is connected to the hydraulic accessory under test through a hydraulic hose to test the performance parameters of the hydraulic accessory under test.

[0008] Preferably, the filtration accuracy of the system return oil filter is different from that of the first suction oil filter, the first outlet oil filter, the second outlet oil filter, the second suction oil filter, the third outlet oil filter, and the fourth outlet oil filter; the filtration accuracies of the first suction oil filter, the first outlet oil filter, and the second outlet oil filter are different from each other; the filtration accuracies of the second suction oil filter, the third outlet oil filter, and the fourth outlet oil filter are different from each other.

[0009] Preferably, the system return oil filter, the first suction oil filter, the first outlet oil filter, the second outlet oil filter, the second suction oil filter, the third outlet oil filter, and the fourth outlet oil filter all have bypass valves.

[0010] Preferably, the performance parameters include pressure and flow rate.

[0011] Preferably, the control cabinet includes a hydraulic part and an electrical part; the hydraulic part includes a control panel, a pressure gauge, a flow sensor, a directional valve, a proportional pressure reducing valve, an overflow valve, a manual pump, a hydraulic switch, and a pressure measuring joint; the oil supply inlet of the first electric pump pressure supply system is connected to the third pressure gauge, the first pressure measuring interface, and the first pressure supply interface;

[0012] The oil supply inlet of the second electric pump pressure supply system is connected to the fourth pressure gauge, the second pressure measuring interface, the second pressure supply interface, the proportional pressure reducing valve, the directional solenoid valve, and the preset accuracy oil filter. The proportional pressure reducing valve is connected to the fifth pressure gauge, the pressure reducing pressure measuring interface, and the pressure reducing pressure supply interface. The directional solenoid valve is connected to the sixth pressure gauge, the directional A port pressure measuring interface, the directional A port pressure supply interface, the seventh pressure gauge, the directional B port pressure measuring interface, and the directional B port pressure supply interface. The preset accuracy oil filter is connected to the eighth pressure gauge, the manual pump pressure measuring interface, and the manual pump pressure supply interface;

[0013] The system return oil interface is connected to the first overflow valve, the ninth pressure gauge, the return oil pressure measurement interface of the first electric pump pressure supply system, the return oil interface of the first electric pump pressure supply system, the first flowmeter, the second flowmeter, the second overflow valve, the tenth pressure gauge, the return oil pressure measurement interface of the second electric pump pressure supply system, the return oil interface of the second electric pump pressure supply system, the third overflow valve, and the fourth overflow valve. The first flowmeter is connected to the oil leakage amount interface, and the second flowmeter is connected to the oil leakage amount interface, the second overflow valve, the tenth pressure gauge, the return oil pressure measurement interface of the second electric pump pressure supply system, and the return oil interface of the second electric pump pressure supply system. The third overflow valve is connected to the first precision pressure gauge and the pressure measurement loop 1 interface, and the fourth overflow valve is connected to the second precision pressure gauge and the pressure measurement loop 1 interface.

[0014] Preferably, the electrical part includes a power supply unit, a drive unit, and a signal acquisition and display unit. The power supply unit is used for power supply and power supply protection. The drive unit is used to drive the first three-phase motor and the second three-phase motor of the hydraulic pump station. The signal acquisition and display unit is used to collect and display flow rate, pressure, and temperature.

[0015] Preferably, it further includes a hand pump pressure supply system for performing a static pressure sealing test on the hydraulic accessory to be measured.

[0016] Preferably, the system heat dissipation module is a system heat dissipation fan.

[0017] The beneficial effects of the present utility model are as follows:

[0018] 1) It can provide functions such as multiple groups of adjustable oil supply output, pressure supply monitoring, system flow rate detection, pressure reduction output, commutation output, oil leakage amount test, and airtightness test for the hydraulic accessory to be measured, and can be used for the functional test requirements of common hydraulic accessories. Description of the Drawings

[0019] Figure 1 It is a schematic connection diagram of the hydraulic pump station and the control cabinet;

[0020] Figure 2 It is a block diagram of the hydraulic pump station principle;

[0021] Figure 3 It is a schematic diagram of the hydraulic pump station principle;

[0022] Figure 4 It is a block diagram of the hydraulic part principle of the control cabinet;

[0023] Figure 5 It is a schematic diagram of the hydraulic part principle of the control cabinet;

[0024] Figure 6 It is a block diagram of the power supply unit principle;

[0025] Figure 7 It is a schematic diagram of the power supply unit principle;

[0026] Figure 8 It is a physical diagram of a switching power supply;

[0027] Figure 9 It is a schematic diagram of the drive unit of a single set of system;

[0028] Figure 10 It is a schematic diagram of the signal acquisition and display unit;

[0029] Figure 11 It is a schematic diagram of the meter head;

[0030] Figure 12 It is an external structure diagram of the hydraulic pump station;

[0031] Figure 13 It is an external structure diagram of the control cabinet. Specific implementation manners

[0032] Next, in combination with the embodiments, the technical solutions of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0033] Refer to Figures 1-13 , the present invention provides a technical solution: a comprehensive test platform for hydraulic accessories, including a hydraulic pump station, the hydraulic pump station is connected to a control cabinet, the hydraulic pump station includes a common oil tank, a system electrical interface, a system return oil filter, a system heat dissipation module, a system return oil interface, a first electric pump pressure supply system and a second electric pump pressure supply system; the system return oil interface is connected to the system heat dissipation module, the system heat dissipation module is connected to the system return oil filter, the system return oil filter is connected to the common oil tank, the common oil tank is connected to the first electric pump pressure supply system and the second electric pump pressure supply system, the first electric pump pressure supply system and the second electric pump pressure supply system are connected to the system electrical interface; the displacement and pressure of the first electric pump pressure supply system and the second electric pump pressure supply system are different;

[0034] The first electric pump pressure supply system includes a first suction oil filter, a first three-phase motor and a fixed-displacement piston pump, a first pressure gauge, a first outlet oil filter, a second outlet oil filter, a first accumulator, a first oil supply interface; the first suction oil filter is connected to the first three-phase motor and the fixed-displacement piston pump; the first three-phase motor and the fixed-displacement piston pump are connected to the first pressure gauge, the first outlet oil filter, the system electrical interface; the first outlet oil filter is connected to the second outlet oil filter; the second outlet oil filter is connected to the first accumulator; the first accumulator is connected to the first oil supply interface;

[0035] The second electric pump pressure supply system includes a second suction oil filter, a second three-phase motor, a variable piston pump, a second pressure gauge, a third outlet oil filter, a fourth outlet oil filter, a second accumulator, and a second oil supply interface; the second suction oil filter is connected to the second three-phase motor and the variable piston pump; the second three-phase motor and the fixed displacement piston pump are connected to the second pressure gauge, the third outlet oil filter, and the system electrical interface; the third outlet oil filter is connected to the fourth outlet oil filter; the fourth outlet oil filter is connected to the second accumulator; the second accumulator is connected to the second oil supply interface;

[0036] The fixed displacement piston pump is controlled by the first three-phase motor and / or the variable piston pump is controlled by the second three-phase motor to provide a pressure source, and then the proportional pressure regulating valve of the control cabinet is used to adjust it to the preset pressure, and the interface on the control cabinet is connected to the hydraulic accessory under test through a hydraulic hose to test the performance parameters of the hydraulic accessory under test.

[0037] In this embodiment, the preset pressure and the filtration accuracy of each oil filter are preset according to the actual working environment and working requirements, and are not limited to a specific numerical value or numerical range. The hydraulic accessory comprehensive test platform mainly consists of two parts: a hydraulic pump station and a control cabinet. The hydraulic pump station mainly consists of a three-phase motor, a piston pump, an oil filter, a relief valve, an accumulator, a fuel tank, a liquid level gauge, an oil temperature gauge, an air filter, a radiator, and pipeline accessories, etc. The control cabinet includes a hydraulic part and an electrical part. The hydraulic part mainly consists of a control panel, a pressure gauge, a flow sensor, a directional control valve, a proportional pressure reducing valve, a relief valve, a hand pump, a hydraulic switch, a pressure measuring joint, etc.; the electrical part mainly includes a push button switch, a digital display meter, a buzzer alarm indicator light, a circuit breaker, a contactor, a soft starter, a switching power supply, etc. The control cabinet uses 380VAC, 50Hz alternating current as the power supply to supply power to its internal control part and display acquisition part; and the control cabinet supplies power to the motor, cooling fan, temperature sensor, etc. of the hydraulic pump station. The oil filter signal transmitter, proportional valve, temperature sensor signal, etc. on the hydraulic pump station are connected to the control cabinet through signal cables, and the control cabinet performs display and control; the hydraulic pump station is connected to the control cabinet through a hydraulic hose and serves as a hydraulic source to realize the pressure supply and oil return functions for the control cabinet and complete relevant test functions. The connection between the hydraulic pump station and the control cabinet is as Figure 1 shown.

[0038] To achieve the measurement and display of the full flow range of the equipment, two flow detection circuits are set in the return oil circuit, with ranges of (1 - 10) L / min and (10 - 100) L / min, and the flow detection circuits are easy to switch, featuring high measurement accuracy and convenient use, etc.

[0039] The pressure detection uses a shock-proof pointer pressure gauge, which has the characteristics of intuitive reading and high reliability. To improve the measurement accuracy and expand the measurement range, two digital pressure measurement circuits of 0.5 MPa and 5 MPa are provided. High-precision pressure sensors are used for measurement and are combined with digital meters for display, which can realize the expansion of the pressure detection range and the improvement of measurement accuracy; the pressure measurement hose and pressure measurement joint are used for connection, which can effectively reduce the pressure impact, extend the service life, and can conveniently realize the in-situ metering of the pressure gauge and the pressure sensor.

[0040] When high-pressure / low-pressure sealing tests are required, the high-pressure sealing test can be directly realized through the hand pump pressure port. When measuring low pressure, the manual pump system can be used in combination with the 0.5 MPa digital pressure measurement circuit to provide micro-pressure measurement. In this working mode, the micro-pressure range is 0.005 MPa to 0.5 MPa, which meets the micro-pressure detection requirements.

[0041] As Figure 2 shown, the hydraulic pump station integrates two pressure supply systems, which are composed of an oil filter, a three-phase motor, a piston pump, a pressure gauge, an accumulator, and a fuel tank assembly. The two pressure supply systems (the first electric pump pressure supply system and the second electric pump pressure supply system, that is, Figure 2 systems 1 and 2 in) share a fuel tank and can work independently and simultaneously. System 1 uses a constant-pressure fixed-displacement piston pump for pressure supply and is driven by a 5.5 kW three-phase motor. The pressure supply range is (0 - 31.5) MPa, and the flow rate is (0 - 7) L / min. An 80 μm signal-sending suction oil filter is used at the oil pump inlet, and signal-sending primary and secondary filters are used at the oil pump outlet. The filtration accuracies are 10 μm and 3 μm respectively, which can send alarm signals when the filter element is blocked, facilitating timely cleaning or replacement of the filter element. In addition, all oil filters have a bypass function and can open the bypass when the filter element is blocked or the pressure difference is large, which can be used as an emergency; a check valve, a pressure gauge, an accumulator, and an overflow valve are also installed at the oil pump outlet. It is convenient to observe the outlet pressure, reduce the pressure pulsation, and limit the maximum system pressure.

[0042] System 2 uses a proportional pressure-regulating variable-displacement piston pump for pressure supply and is driven by a 22 kW three-phase motor. The pressure supply range is (0 - 22) MPa, the rated flow rate is (0 - 45) L / min, and the maximum flow rate is 70 L / min. An 80 μm signal-sending suction oil filter is used at the oil pump inlet, and signal-sending primary and secondary filters are used at the oil pump outlet. The filtration accuracies are 10 μm and 3 μm respectively, which can send alarm signals when the filter element is blocked, facilitating timely cleaning or replacement of the filter element. In addition, all oil filters have a bypass function and can open the bypass when the filter element is blocked or the pressure difference is large, which can be used as an emergency; a check valve, a pressure gauge, an accumulator, and an overflow valve are also installed at the oil pump outlet. It is convenient to observe the outlet pressure, reduce the pressure pulsation, and limit the maximum system pressure.

[0043] The differences between System 1 and System 2 lie in the displacement and pressure settings of the oil pump. System 1 can provide an adjustable pressure source of (0 - 31.5) MPa, with a flow rate adjustment range of (0 - 7) L / min; System 2 can provide an adjustable pressure source of (0 - 22) MPa, with a flow rate adjustment range of (0 - 70) L / min. The set pressure of the outlet overflow valve of System 1 is 33 MPa, and the set pressure of the outlet overflow valve of System 2 is 23 MPa. A 40 MPa pressure gauge is installed at the outlet of both systems.

[0044] The return oil pipeline of the pump station is connected to the return oil port of the test bench control cabinet. An air-cooled radiator and a return oil filter with bypass and signaling functions are installed on the return oil pipeline. The filtration accuracy of the oil filter is 20 μm, which can cool down and filter the oil, ensuring the long-term operation of the system.

[0045] The shared fuel tank is made of stainless steel to avoid contaminating the oil. The designed volume of the fuel tank is 300 L, and it integrates devices such as an air filter, a temperature transmitter, a liquid level gauge, and an oil drain valve, facilitating operations such as refueling, temperature monitoring, liquid level display, and oil drainage.

[0046] The pressure supply outlets of Hydraulic Pumping Station System 1 and System 2 are connected to the System 1 and System 2 pressure input ports of the test bench control cabinet through hydraulic hoses. The functions of each oil port are controlled inside the test bench control cabinet. The return oil port of the test bench control cabinet is connected to the return oil pipeline of the hydraulic pumping station through a hydraulic hose (System 1 and System 2 share the same return oil pipeline), and flows back to the fuel tank after passing through the air-cooled radiator and the oil filter; the motor startup, radiator startup, proportional pressure regulating valve, oil temperature sensor, etc. of the hydraulic pumping station are all powered and controlled by the test bench control cabinet, and the signals of the oil temperature sensor, oil filter alarm signal, etc. are displayed on the instruments or indicators on the cabinet panel.

[0047] In some embodiments, the filtration accuracy of the system return oil filter is different from that of the first suction oil filter, the first outlet oil filter, the second outlet oil filter, the second suction oil filter, the third outlet oil filter, and the fourth outlet oil filter; the filtration accuracies of the first suction oil filter, the first outlet oil filter, and the second outlet oil filter are different from each other; the filtration accuracies of the second suction oil filter, the third outlet oil filter, and the fourth outlet oil filter are different from each other.

[0048] In some embodiments, the system return oil filter, the first suction oil filter, the first outlet oil filter, the second outlet oil filter, the second suction oil filter, the third outlet oil filter, and the fourth outlet oil filter all have bypass valves.

[0049] In some embodiments, the performance parameters include pressure and flow rate.

[0050] In this embodiment, the control cabinet monitors parameters such as pressure and flow rate in the oil circuit in real time, enabling relevant performance tests.

[0051] In some embodiments, the control cabinet includes a hydraulic part and an electrical part; the hydraulic part includes a control panel, a pressure gauge, a flow sensor, a directional valve, a proportional pressure reducing valve, a relief valve, a manual pump, a hydraulic switch, and a pressure measuring joint; the oil supply inlet of the first electric pump pressure supply system is connected to a third pressure gauge, a first pressure measuring interface, and a first pressure supply interface;

[0052] The oil supply inlet of the second electric pump pressure supply system is connected to a fourth pressure gauge, a second pressure measuring interface, a second pressure supply interface, a proportional pressure reducing valve, a directional solenoid valve, and a preset precision oil filter. The proportional pressure reducing valve is connected to a fifth pressure gauge, a pressure reducing pressure measuring interface, and a pressure reducing pressure supply interface. The directional solenoid valve is connected to a sixth pressure gauge, a directional A port pressure measuring interface, a directional A port pressure supply interface, a seventh pressure gauge, a directional B port pressure measuring interface, a directional B port pressure supply interface. The preset precision oil filter is connected to an eighth pressure gauge, a manual pump pressure measuring interface, and a manual pump pressure supply interface;

[0053] The system return oil interface is connected to a first relief valve, a ninth pressure gauge, the return oil pressure measuring interface of the first electric pump pressure supply system, the return oil interface of the first electric pump pressure supply system, a first flowmeter, a second flowmeter, a second relief valve, a tenth pressure gauge, the return oil pressure measuring interface of the second electric pump pressure supply system, the return oil interface of the second electric pump pressure supply system, a third relief valve, and a fourth relief valve. The first flowmeter is connected to a leakage oil volume interface. The second flowmeter is connected to a leakage oil volume interface, a second relief valve, a tenth pressure gauge, and the return oil pressure measuring interface and the return oil interface of the second electric pump pressure supply system. The third relief valve is connected to a first precision pressure gauge and a pressure measuring circuit 1 interface. The fourth relief valve is connected to a second precision pressure gauge and a pressure measuring circuit 1 interface.

[0054] In this embodiment, the hydraulic oil coming from the hydraulic pump station is controlled by the oil ports and switches on the control panel to realize the functional test of the measured part. The test bench control cabinet mainly provides a system 1 pressure circuit, a system 2 pressure circuit, a pressure reducing pressure circuit, a directional pressure circuit (A and B ports), a return oil circuit, a manual pump circuit, and a pressure measuring circuit.

[0055] The system 1 pressure port of the system 1 pressure circuit outputs a maximum pressure of 31.5 MPa and a flow rate of (0 - 7) L / min. The on-off of the oil port and the flow rate are controlled by the switch YK1-1. The pressure gauge YB1 displays the hydraulic pressure of the system 1 pressure port. The return oil unloading can be realized through the YK1-3 return oil switch. In addition, the system 1 pressure measuring port YJ1-2 is a pressure measuring port, which is controlled by the switch YK1-2. This pressure measuring port can measure the pressure by connecting pressure gauges with different ranges (such as measuring the flow resistance at low pressure).

[0056] The maximum pressure output at the System 2 pressure port of the System 2 pressure circuit is 22 MPa. The proportional relief valve on the pump is driven by the "System 2 Pressure Regulation" knob on the panel for pressure regulation. The flow rate is (0 - 70) L / min. The on-off of the oil port and the flow rate are controlled by the switch YK2-1. The pressure gauge YB2 displays the hydraulic pressure at the System 2 pressure port. The return oil unloading can be achieved through the YK2-3 return oil switch. In addition, the pressure measurement port YJ2-2 of System 2 is a pressure measurement port, which is controlled by the switch YK2-2. This pressure measurement port can measure the pressure by connecting pressure gauges with different ranges (such as measuring the flow resistance at low pressure).

[0057] The reduced pressure at the reduced pressure port is a pressure branch of System 2. The pressure of System 2 enters the reduced pressure circuit through the BLYL1 proportional reducing valve. The pressure is adjusted by the "Reduced Pressure Regulation" knob on the panel. The pressure gauge YB3 displays the hydraulic pressure at the reduced pressure port. The YJ3-2 reduced pressure measurement port is controlled by the switch YK3-2. This pressure measurement port can measure the pressure by connecting pressure gauges with different ranges (such as measuring at low pressure).

[0058] The reversing pressure port of the reversing pressure circuit (A and B ports) is a pressure branch of System 2. The pressure of System 2 enters the reversing pressure circuit after being controlled by the switch YK3 and is controlled by a three-position four-way solenoid reversing valve to achieve the pressure switching between port A and port B. It is controlled by the "Solenoid Valve Reversing SV1" knob switch on the panel. Pressure gauges YB4-1 and YB4-2 are installed at both port A and port B to detect the pressure of each oil port. This pressure branch is mainly used to detect accessories such as actuating cylinders that require pressure reversing work.

[0059] The return oil circuit of the return oil loop is divided into the System 1 return oil circuit and the System 2 return oil circuit: The System 1 return oil circuit is equipped with the pressure gauge YB5 and the pressure measurement port YJ5-2 for pressure display and return oil pressure measurement. The YK5 switch is used to adjust the return oil flow rate. In addition, the return oil circuit is equipped with the DB1 relief valve with a set opening pressure of 12 MPa, which can automatically relieve pressure when the pressure is too high to protect the system safety; The System 2 return oil circuit is equipped with the pressure gauge YB6 and the pressure measurement port YJ6-2 for pressure display and return oil pressure measurement. It is also equipped with a leakage oil volume interface, a return oil switch, a (1 - 10) L / min flow detection circuit and a (10 - 100) L / min flow detection circuit, which are controlled by the switches YK6-3, YK6, YK6-1 and YK6-2 respectively. The leakage oil volume can be collected, the return oil flow rate can be adjusted, and the flow rate from 1 L / min to 100 L / min can be detected. The circuit is equipped with the DB2 relief valve with an opening pressure set at 12 MPa, which can automatically relieve pressure when the pressure is too high to protect the system safety.

[0060] The pressure measurement circuit is divided into two paths of (0 - 0.5) MPa and (0 - 5) MPa. High-precision digital pressure sensors (YB9 and YB8) / digital display meters are used to collect and display the pressure values. It has an overload capacity of 2 times, and the measurement accuracy is 0.5 level. Relief valves (DB4 and DB3) are respectively set in the two pressure measurement circuits, and the set opening pressures are 0.5 MPa and 5 MPa. When the pressure reaches or exceeds the set value, the relief valve automatically relieves pressure and flows back to the oil tank to ensure the safety of the system and the instrument.

[0061] The manual pump circuit uses a high-pressure manual pump SB1 with a rated outlet pressure of (0 - 40) MPa (maximum 70 MPa), and the flow rate is not less than 30 mL / 10 cycles. The manual pump is equipped with a pressure relief switch to achieve pressure relief. The oil fluid pressurized by the manual pump passes through the YL4 filter and the YK7 switch, and then is output through the hand pump pressure port YJ7-1, and the real-time pressure is displayed by the pressure gauge YB7 (range 60 MPa). A pressure measurement port YJ7-2 is set in this branch for external pressure measurement (such as at low pressure).

[0062] In some embodiments, the electrical part includes a power supply unit, a drive unit, and a signal acquisition and display unit. The power supply unit is used for power supply and power supply protection. The drive unit is used to drive the first three-phase motor and the second three-phase motor of the hydraulic pump station. The signal acquisition and display unit is used to collect and display flow rate, pressure, and temperature.

[0063] In this embodiment, the main function of the electrical part is to provide electrical control for the hydraulic accessory comprehensive test platform, and to collect and display parameters such as pressure, flow rate, and temperature in the oil circuit in real time. The main components are: a power supply unit, a drive unit, and a signal acquisition and display unit. The power supply unit is mainly composed of a circuit breaker, a phase sequence protector, a toroidal transformer, and a switching power supply. The principle block diagram is as Figure 6 shown. The circuit breakers F1 and F2 are selected from two models of CHINT NM1-63S / 3300-63A and NM1-63S / 3300-16A, with a rated voltage of 380V three-phase and rated currents of 63A and 16A, which are used for the soft starter protection of the three-phase motors in the two pressure supply systems of the hydraulic pump station. The phase sequence protector is selected from CHINT XJ3-D, which is used for the phase sequence, overvoltage, and undervoltage detection and alarm of the input 380V three-phase. When the three-phase 380V phase sequence is incorrect, the internal buzzer alarms, and at the same time, the control cabinet cannot be powered on until the fault is eliminated. The toroidal transformer is used to transform the 380V voltage into 220V voltage output to provide working voltage for the switching power supply, flow meter, pressure gauge, and temperature gauge. The switching power supply is selected from two models of Mean Well RSP-150-24 and LRS-35-12, which can output 24VDC and 10VDC power supplies to supply power for relays, indicator lights, and proportional control boards.

[0064] The drive unit is mainly composed of soft starters and is used to drive the pump station motor. Two models of soft starters, CHINT NJR2-30D and NJR2-7.5D, are selected, with rated drive powers of 30KW and 7.5KW respectively, meeting the drive requirements of 22KW and 5.5KW motors.

[0065] The signal acquisition and display unit is mainly divided into the acquisition and display of three types of signals: flow rate, pressure, and temperature. For the flow rate acquisition and display part, the flowmeter (flow sensor) converts the hydraulic oil flow rate into a 4mA - 20mA current signal, which is then sent to the flow meter for real-time flow rate display. The flow meter model is Changhui SWP-LK901-01-A-HL-T, powered by 220VAC, with signal input selected as 4mA - 20mA, the range can be set, the maximum is (0 - 9999) L / min, the measurement accuracy is 0.5%FS. The flow sensors are Shanghai Fanyang LWGY6A05WSN and LWGY15A05SSN, corresponding to the ranges of 1L / min - 10L / min and 10L / min - 100L / min respectively, with a measurement accuracy of 0.5 level, which can meet the measurement requirements of (0 - 70) L / min.

[0066] For the pressure acquisition and display part, the pressure sensor converts the hydraulic oil pressure value into a 4mA - 20mA current signal, which is then sent to the pressure gauge for real-time pressure display. The pressure gauge model is Changhui SWP-C403-01-12-HH-P, powered by 220VAC, with signal input selected as 4mA - 20mA, the range can be set, the maximum is (-1999 - 9999) digits, the measurement accuracy is 0.5%FS. The pressure sensors are Kunlun Coast JYB-KO-HAG type, and the two pressure sensors correspond to 0MPa - 0.5MPa and 0MPa - 5MPa respectively, meeting the measurement requirements of (0 - 5) MPa.

[0067] For the temperature acquisition and display part, the intelligent temperature transmitter installed in the hydraulic pump station tank converts the oil temperature in the tank into a 4mA - 20mA current signal, which is then sent to the temperature gauge for real-time oil temperature display. The intelligent temperature transmitter installed in the hydraulic pump station tank is of model LQT202, with a temperature measurement range of 0℃ - 100℃ and an accuracy of ±0.5%. The temperature gauge model is Changhui SWP-G401-01-12-HH-P, powered by 220VAC, with signal input selected as 4mA - 20mA, the range can be set, the maximum is (-1999 - 9999) digits, the measurement accuracy is 0.5%FS, meeting the temperature monitoring requirements.

[0068] In some embodiments, it also includes a hand pump pressure supply system, which is used to conduct a static pressure seal test on the hydraulic accessory under test.

[0069] In this embodiment, the hydraulic accessory comprehensive test platform provides three pressure supply systems, two of which are electric pump pressure supply systems and one is a hand pump pressure supply system; the two electric pump pressure supply systems can be used to supply pressure to the hydraulic accessories under test, and the hand pump pressure supply system is generally used to perform static pressure sealing tests on hydraulic accessories.

[0070] In some embodiments, the system heat dissipation module is a system heat dissipation fan.

[0071] like Figure 12 As shown, the hydraulic pump station is designed as a cart-type structure, with a push-pull handrail and a bottom plate forming the overall frame. Two directional wheels and two universal wheels are installed on the bottom plate to facilitate the short-distance movement of the pump station as a whole. On the left side of the bottom plate of the cart structure is an oil tank with a volume of about 300L made of stainless steel material. Next to the oil tank is an air-cooled radiator for cooling the return oil. In addition, the oil tank is also integrated with air filters, temperature transmitters, liquid level gauges, oil drain valves and other devices to facilitate refueling, temperature monitoring, liquid level display, oil draining and other operations. On the right side of the bottom plate are two plunger pumps and three-phase motors, corresponding to the pump station pressure supply system 1 and pressure supply system 2 respectively. The oil tank and the plunger pump are connected with a one-way valve, accumulator, overflow valve, oil filter, pressure gauge and other components.

[0072] like Figure 13 As shown, the control cabinet adopts sheet metal structure, and the bottom adopts channel steel welded frame. Under the premise of ensuring structural strength, the total amount of equipment is reduced as a whole. The equipment size is ≤2000mm×1500mm×2000mm, and the weight is ≤500kg. The equipment is designed with heavy-duty casters and horizontal adjustment feet to facilitate the in-field movement and positioning storage of the equipment; the surface of the equipment is sprayed with plastic to improve the anti-corrosion performance. The control cabinet countertop is designed as an oil tray, made of stainless steel, which can collect excess hydraulic oil during the test. Two storage drawers are designed under the control cabinet countertop, and the bottom layer is set up with an oil pipe storage area. Inspection doors are set up on the side and rear for easy use. The installation partition of electrical components is designed inside, and the electrical area and hydraulic pipeline area are divided into zones to achieve liquid and electrical isolation and improve the safety of the equipment; the manual pump is designed on the right side to meet the operating habits. The bottom right of the cabinet is the oil pan drain port, and the bottom of the rear side of the cabinet is the cable interface and oil pipe interface.

[0073] The panel of the control cabinet is made of sheet metal bending, with plastic spraying on the surface, and has good three-proof performance. The panel font is screen-printed.

[0074] The control cabinet panel is self-designed and laid out according to the convenience of operation and functions for easy use. It is mainly composed of pressure gauges, switches, oil ports, display instruments, control buttons, indicator lights, etc.

[0075] The above are only the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the concept described herein through the above teachings or the technology or knowledge in the relevant field. As long as the changes and variations made by those skilled in the art do not depart from the spirit and scope of the present invention, they should all be within the protection scope of the appended claims of the present invention.

Claims

1. A comprehensive test platform for hydraulic accessories, characterized in that: It includes a hydraulic pump station which is connected to a control cabinet. The hydraulic pump station includes a common oil tank, a system electrical interface, a system return oil filter, a system heat dissipation module, a system return oil interface, a first electric pump pressure supply system, and a second electric pump pressure supply system. The system return oil interface is connected to the system heat dissipation module, the system heat dissipation module is connected to the system return oil filter, the system return oil filter is connected to the common oil tank, the common oil tank is connected to the first electric pump pressure supply system and the second electric pump pressure supply system, and the first electric pump pressure supply system and the second electric pump pressure supply system are connected to the system electrical interface. The displacement and pressure of the first electric pump pressure supply system and the second electric pump pressure supply system are different. The first electric pump pressure supply system includes a first suction oil filter, a first three-phase motor and a fixed-displacement piston pump, a first pressure gauge, a first outlet oil filter, a second outlet oil filter, a first accumulator, and a first oil supply interface. The first suction oil filter is connected to the first three-phase motor and the fixed-displacement piston pump. The first three-phase motor and the fixed-displacement piston pump are connected to the first pressure gauge, the first outlet oil filter, and the system electrical interface. The first outlet oil filter is connected to the second outlet oil filter. The second outlet oil filter is connected to the first accumulator. The first accumulator is connected to the first oil supply interface. The second electric pump pressure supply system includes a second suction oil filter, a second three-phase motor and a variable-displacement piston pump, a second pressure gauge, a third outlet oil filter, a fourth outlet oil filter, a second accumulator, and a second oil supply interface. The second suction oil filter is connected to the second three-phase motor and the variable-displacement piston pump. The second three-phase motor and the fixed-displacement piston pump are connected to the second pressure gauge, the third outlet oil filter, and the system electrical interface. The third outlet oil filter is connected to the fourth outlet oil filter. The fourth outlet oil filter is connected to the second accumulator. The second accumulator is connected to the second oil supply interface. By controlling the fixed-displacement piston pump with the first three-phase motor and / or controlling the variable-displacement piston pump with the second three-phase motor to provide a pressure source, then using the proportional pressure regulating valve of the control cabinet to adjust to the preset pressure, and connecting the interface on the control cabinet with the hydraulic accessory to be measured through a hydraulic hose to test the performance parameters of the hydraulic accessory to be measured.

2. The hydraulic accessory comprehensive test platform according to claim 1, wherein: The filtration accuracy of the system return oil filter is different from that of the first suction oil filter, the first outlet oil filter, the second outlet oil filter, the second suction oil filter, the third outlet oil filter, and the fourth outlet oil filter. The filtration accuracies of the first suction oil filter, the first outlet oil filter, and the second outlet oil filter are different from each other. The filtration accuracies of the second suction oil filter, the third outlet oil filter, and the fourth outlet oil filter are different from each other.

3. The hydraulic accessory comprehensive test platform according to claim 1, characterized in that: The system return oil filter, the first suction oil filter, the first outlet oil filter, the second outlet oil filter, the second suction oil filter, the third outlet oil filter, and the fourth outlet oil filter all have bypass valves.

4. The hydraulic accessory comprehensive test platform according to claim 1, wherein: The performance parameters include pressure and flow rate.

5. The hydraulic accessory comprehensive test platform according to claim 1, characterized in that: The control cabinet includes a hydraulic part and an electrical part. The hydraulic part includes a control panel, a pressure gauge, a flow sensor, a directional valve, a proportional pressure reducing valve, an overflow valve, a manual pump, a hydraulic switch, and a pressure measuring joint. The oil supply inlet of the first electric pump pressure supply system is connected to the third pressure gauge, the first pressure measuring interface, and the first pressure supply interface. The oil supply inlet of the second electric pump pressure supply system is connected to the fourth pressure gauge, the second pressure measurement interface, the second pressure supply interface, the proportional pressure reducing valve, the reversing solenoid valve, and the preset precision oil filter. The proportional pressure reducing valve is connected to the fifth pressure gauge, the pressure reducing measurement interface, and the pressure reducing supply interface. The reversing solenoid valve is connected to the sixth pressure gauge, the reversing port A pressure measurement interface, the reversing port A pressure supply interface, the seventh pressure gauge, the reversing port B pressure measurement interface, and the reversing port B pressure supply interface. The preset precision oil filter is connected to the eighth pressure gauge, the manual pump pressure measurement interface, and the manual pump pressure supply interface; The system return oil interface is connected to the first overflow valve, the ninth pressure gauge, the return oil pressure measurement interface of the first electric pump pressure supply system, the return oil interface of the first electric pump pressure supply system, the first flow meter, the second flow meter, the second overflow valve, the tenth pressure gauge, the return oil pressure measurement interface of the second electric pump pressure supply system, the return oil interface of the second electric pump pressure supply system, the third overflow valve, and the fourth overflow valve. The first flow meter is connected to the oil leakage amount interface. The second flow meter is connected to the oil leakage amount interface, the second overflow valve, the tenth pressure gauge, the return oil pressure measurement interface of the second electric pump pressure supply system, and the return oil interface of the second electric pump pressure supply system. The third overflow valve is connected to the first precision pressure gauge and the pressure measurement loop 1 interface. The fourth overflow valve is connected to the second precision pressure gauge and the pressure measurement loop 1 interface.

6. The hydraulic accessory comprehensive test platform according to claim 5, characterized in that: The electrical part includes a power supply unit, a drive unit, and a signal acquisition and display unit. The power supply unit is used for power supply and power supply protection. The drive unit is used to drive the first three-phase motor and the second three-phase motor of the hydraulic pump station. The signal acquisition and display unit is used to acquire and display the flow rate, pressure, and temperature.

7. The hydraulic accessory comprehensive test platform according to any one of claims 1-6, characterized in that: It also includes a hand pump pressure supply system, which is used to perform a static pressure sealing test on the hydraulic accessory to be measured.

8. The hydraulic accessory comprehensive test platform according to any one of claims 1-6, characterized in that: The system heat dissipation module is a system heat dissipation fan.

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