Portable multifunctional rapid switching hydraulic element testing device and method

Abstract

The invention belongs to the field of aviation hydraulic testing, and relates to a portable multifunctional rapid switching hydraulic element testing device and method. The device comprises a first oil outlet connector, a second oil outlet connector, a third oil outlet connector, a fourth oil outlet connector, a first pressure gauge connector, a second pressure gauge connector, a first electromagnetic valve, a second electromagnetic valve, a pressure storage gas cylinder, a flowmeter, a first pressure gauge, a second pressure gauge, a main oil inlet connector, a main oil return connector and an aluminum valve block.

Description

Technical Field

[0001] The invention belongs to the field of aviation hydraulic testing and relates to a portable multifunctional fast-switching hydraulic component testing device and method. Background Art

[0002] Various hydraulic valves, actuators and other parts and components of helicopters need to undergo various tests before installation. When conducting different tests, parts need to be frequently disassembled and assembled. Frequent disassembly and assembly affects work efficiency and is likely to cause damage to parts, and leakage is prone to occur at the joints. Summary of the invention

[0003] Purpose of the invention: In order to avoid frequent disassembly and assembly of parts during the test, a special device is set between the tester and the parts under test, and a portable hydraulic pipeline quick switching device is used to achieve one-time clamping, quick switching of the test path, and complete various tests of parts.

[0004] Technical solution:

[0005] In a first aspect, a portable multifunctional quick-switching hydraulic component testing device is provided, comprising: a first oil outlet joint, a second oil outlet joint, a third oil outlet joint, a fourth oil outlet joint, a first pressure gauge joint, a second pressure gauge joint, a first solenoid valve, a second solenoid valve, a pressure storage gas cylinder, a first pressure gauge of a flow meter, a second pressure gauge, a total oil inlet joint, a total oil return joint, and an aluminum valve block;

[0006] The aluminum valve block is a rectangular parallelepiped with arcs at the four corners, a hydraulic oil flow channel in the middle, and the surface is equipped with the first oil outlet joint, the second oil outlet joint, the third oil outlet joint, the fourth oil outlet joint, the total oil inlet joint, the total oil return joint, the first pressure gauge joint, and the second pressure gauge joint;

[0007] The main oil inlet joint is divided into two channels, which are respectively connected with the No. 1 interface of the first solenoid valve and the No. 1' interface of the second solenoid valve; the main oil return joint is divided into two channels, which are respectively connected with the No. 2 interface of the first solenoid valve and the No. 2' interface of the second solenoid valve; the first oil outlet joint is connected with the No. 3 interface of the first solenoid valve, the second oil outlet joint is connected with the No. 4 interface of the first solenoid valve, the third oil outlet joint is connected with the No. 3' interface of the second solenoid valve, and the fourth oil outlet joint is connected with the No. 4' interface of the second solenoid valve; the bifurcation point of the two channels of the main oil inlet joint is connected with the pressure storage gas cylinder, and the bifurcation point of the two channels of the main oil return joint is connected with the flow meter; the first pressure gauge joint and the second pressure gauge joint are connected with the corresponding pressure gauges according to the needs of the parts test, and are directly connected with the pressure measuring port of the tested part for measurement and reading.

[0008] The device also includes: stainless steel housing, electrical components, buttons, display instruments and signs;

[0009] A stainless steel outer cover is arranged on the aluminum valve block, various hydraulic components and electrical components are installed inside the cover, and buttons, display instruments and signs are arranged outside the cover; the first pressure gauge and the second pressure gauge are installed outside the top of the stainless steel outer cover.

[0010] The first oil outlet joint, the second oil outlet joint, the third oil outlet joint, the fourth oil outlet joint, the total oil inlet, and the total oil return port are all cylindrical, with a through hole in the middle of the cylinder, pipe threads at both ends of the outer surface of the cylinder, and a hexagonal convex block in the middle;

[0011] The first pressure gauge joint and the second pressure gauge joint are cylindrical, with a through hole in the middle of the cylinder, a pipe thread at one end of the outer surface of the cylinder, a tapered thread at one end of the outer surface of the cylinder, and a hexagonal convex block in the middle.

[0012] The buttons include a first solenoid valve switch, a first solenoid valve switch and a power button; the first solenoid valve switch and the first solenoid valve switch are used to control the switching and gating of the corresponding solenoid valves; the power button is used to control whether the entire device is powered on or not.

[0013] In a second aspect, a portable multifunctional fast-switching hydraulic component testing method is provided, comprising:

[0014] Step 1: Connect the total oil inlet and total oil return port of the portable multifunctional quick-switching hydraulic component testing device to the hydraulic oil inlet and return circuit of other external equipment;

[0015] Step 2: After plugging in the external power cord, turn the power button on the operation panel to "On".

[0016] position, when the green indicator light of the power button lights up, the device is powered on;

[0017] Step 3: According to different parts testing requirements, connect the parts oil port to the different oil flow paths of the first oil outlet joint, the second oil outlet joint, the third oil outlet joint, and the fourth oil outlet joint of the device, and operate the first solenoid valve and the second solenoid valve respectively according to the test requirements, which can be combined into the following four flow paths:

[0018] 1). The first path: oil enters from the first oil outlet connector, passes through the first solenoid valve, and exits from the second oil outlet connector;

[0019] 2). The second path: oil enters from the second oil outlet connector, passes through the first solenoid valve, and exits from the first oil outlet connector;

[0020] 3). The third path: oil enters from the third oil outlet connector, passes through the second solenoid valve, and exits from the fourth oil outlet connector;

[0021] 4). The fourth path: oil enters from the fourth oil outlet connector, passes through the second solenoid valve, and exits from the third oil outlet connector; the above flow paths all pass through the gear flow meter on the total oil return port to measure the part flow, and the process value is displayed through the secondary instrument;

[0022] Step 4: Connect the first pressure gauge connector and the second pressure gauge connector to the corresponding pressure gauges through the stainless steel conduit according to the part testing requirements, and directly connect them to the pressure measuring port of the tested part for measurement and reading.

[0023] If the product under test has 4 oil ports, and port 1 of the product is connected to the first oil outlet connector, port 2 of the product is connected to the second oil outlet connector, port 3 of the product is connected to the third oil outlet connector, and port 4 of the product is connected to the fourth oil outlet connector;

[0024] Correspondingly, the oil flow direction and action description:

[0025] When the electromagnet corresponding to the first oil outlet connector in the first solenoid valve is energized and the electromagnet corresponding to the second oil outlet connector is not energized, the oil flows from port 1 through the first path of the device into port 2;

[0026] When the electromagnet corresponding to the second oil outlet connector in the first solenoid valve is energized and the electromagnet corresponding to the first oil outlet connector is not energized, the oil flows from port 2 through the second path of the device into port 1;

[0027] When the electromagnet corresponding to the third oil outlet connector in the second solenoid valve is energized and the electromagnet corresponding to the fourth oil outlet connector is not energized, the oil flows from the 3rd port through the third path of the device into the 4th port;

[0028] When the electromagnet corresponding to the fourth oil outlet connector in the second solenoid valve is energized and the electromagnet corresponding to the third oil outlet connector is not energized, the oil flows from port 4 through the fourth path of the device into port 3; the flow resistance is measured.

[0029] If the product under test has three oil ports: port A, port B and port C; port A is connected to the first oil outlet connector, port C is connected to the fourth oil outlet connector, and port B is connected to the second oil outlet connector and the third oil outlet connector at the same time;

[0030] Correspondingly, the oil flow direction and action description:

[0031] When the electromagnet corresponding to the first oil outlet connector in the first solenoid valve is energized and the electromagnet corresponding to the second oil outlet connector is not energized, the oil flows from port A through the first path into port B;

[0032] When the electromagnet corresponding to the third oil outlet connector in the second solenoid valve is energized and the electromagnet corresponding to the fourth oil outlet connector is not energized, the oil flows from the B port to the C port via the third path;

[0033] When the electromagnet corresponding to the fourth oil outlet connector in the second solenoid valve is energized and the electromagnet corresponding to the third oil outlet connector is not energized, the oil flows from the C port to the B port via the third path;

[0034] A three-way connector needs to be connected to the outside of port B to measure the flow resistance.

[0035] If the product under test has three oil ports: port A, port U and port R; port A is connected to the first oil outlet connector, port R is connected to the fourth oil outlet connector, and port U is simultaneously connected to the second oil outlet connector, the third oil outlet connector and the first pressure gauge connector;

[0036] When the electromagnet corresponding to the first oil outlet connector in the first solenoid valve is energized and the electromagnet corresponding to the second oil outlet connector is not energized, the oil flows from the A port through the first path into the U port;

[0037] When the electromagnet corresponding to the third oil outlet connector in the second solenoid valve is energized and the electromagnet corresponding to the fourth oil outlet connector is not energized, the product oil port flow direction is: the oil flows from the U port through the third path into the R port;

[0038] When the electromagnet corresponding to the first oil outlet connector in the first solenoid valve is not energized and the electromagnet corresponding to the second oil outlet connector is energized, port A is the oil supply port and port U is connected to the pressure gauge;

[0039] A tee joint needs to be connected to the outside of the U port.

[0040] If the product under test has 4 oil ports: A port, R port, B port and C port;

[0041] Port A is connected to the first oil outlet connector, port R is connected to the second oil outlet connector, port B is connected to the first pressure gauge connector, and port C is connected to the second pressure gauge connector;

[0042] When the electromagnet corresponding to the first oil outlet connector in the first solenoid valve is energized and the electromagnet corresponding to the second oil outlet connector is not energized, the oil flows from the A port through the first path into the U port;

[0043] Product B port is connected to the first pressure gauge;

[0044] Product C port is connected to the second pressure gauge.

[0045] If the product under test has two oil ports: port A and port B; port A is connected to the first oil outlet connector, and port B is connected to the second oil outlet connector.

[0046] Oil flow direction and action description:

[0047] When the electromagnet corresponding to the first oil outlet connector in the first solenoid valve is energized and the electromagnet corresponding to the second oil outlet connector is not energized, oil is produced, and the oil flows from port A through the first path into port B; and the flow rate is measured;

[0048] When the electromagnet corresponding to the first oil outlet connector in the first solenoid valve is not energized and the electromagnet corresponding to the second oil outlet connector is energized, the oil flows from the B port into the A port via the second path.

[0049] Beneficial effects:

[0050] A portable multifunctional quick-switching hydraulic component testing device and method are provided, which are used for pre-installation testing of various hydraulic valves, actuators and other parts and components of helicopters. The device is developed to avoid disassembly of the pipeline connection between the tester and the tested part. Frequent disassembly and assembly of the pipeline is prone to damage and affects work efficiency. Leakage is prone to occur at the connection. At the same time, this device can realize testing of different parameters of multiple parts.

[0051] This device is used in conjunction with a hydraulic test bench for the following purposes: a. to fix the connection between the tested component and other hydraulic oil sources; b. to test the pressure, flow resistance and function of different hydraulic components under different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a schematic diagram of a portable multifunctional fast-switching hydraulic component testing device.

[0053] Figure 2 It is the internal installation diagram of a portable multifunctional quick-switching hydraulic component testing device.

[0054] Figure 3 This is the appearance diagram of a portable multifunctional quick-switching hydraulic component testing device.

[0055] Figure 4 It is a base aluminum valve block diagram of a portable multi-functional fast-switching hydraulic component testing device.

[0056] Figure 5 This is a schematic diagram of the oil flow of product one.

[0057] Figure 6 This is a schematic diagram of the oil flow of product two.

[0058] Figure 7 This is a schematic diagram of the oil flow of product three.

[0059] Figure 8 This is a schematic diagram of the oil flow of product four.

[0060] Fig. 9 This is a schematic diagram of the oil flow of product five.

[0061] Among them, the first oil outlet connector 1, the second oil outlet connector 2, the third oil outlet connector 3, the fourth oil outlet connector 4, the first pressure gauge connector 5, the second pressure gauge connector 6, the first solenoid valve 7, the second solenoid valve 8, the pressure storage gas cylinder 9, the gear flowmeter 10, the first pressure gauge 11, the second pressure gauge 12, the stainless steel conduit 13, the total oil inlet connector 14, the total oil return connector 15, the aluminum valve block 16, 4 manual adjustment studs 17, the stainless steel outer cover 18, the electrical components 19, the power button 20, the display instrument 21 and the nameplate 22, the handle 23, the first solenoid valve switch 24 and the first solenoid valve switch 25. DETAILED DESCRIPTION

[0062] The present invention provides a portable multifunctional fast-switching hydraulic component testing device, which includes an aluminum valve block as the main body, 4 manual adjustment studs at the bottom, a stainless steel cover on the valve block, various hydraulic components and electrical components installed inside the cover, and electrical operation buttons, display instruments and signs installed outside the cover. An exposed precision pressure gauge is installed on the top of the device. Figure 1-2 As shown, it specifically includes a first oil outlet connector 1, a second oil outlet connector 2, a third oil outlet connector 3, a fourth oil outlet connector 4, a first pressure gauge connector 5, a second pressure gauge connector 6, a first solenoid valve 7, a second solenoid valve 8, a pressure storage gas cylinder 9, a gear flow meter 10, a first pressure gauge 11, a second pressure gauge 12, a stainless steel conduit 13, a total oil inlet connector 14, a total oil return connector 15, an aluminum valve block 16, 4 manual adjustment studs 17, a stainless steel outer cover 18, an electrical component 19, a power button 20, a display instrument 21 and a label 22, a handle 23, a first solenoid valve switch 24 and a second solenoid valve switch 25.

[0063] The first oil outlet connector 1, the second oil outlet connector 2, the third oil outlet connector 3, the fourth oil outlet connector 4, the total oil inlet 14, and the total oil return port 15 are cylindrical, with a through hole in the middle of the cylinder, pipe threads at both ends of the outer surface of the cylinder, and a hexagonal convex block in the middle, which is assembled correspondingly with the aluminum valve block 16;

[0064] The first pressure gauge connector 5 and the second pressure gauge connector 6 are cylindrical, with a through hole in the middle of the cylinder, a pipe thread at one end of the outer surface of the cylinder, a tapered thread at one end of the outer surface of the cylinder, and a hexagonal convex block in the middle, which is assembled correspondingly with the aluminum valve block 16;

[0065] Further, the first solenoid valve 7 and the second solenoid valve 8 are assembled corresponding to the upper surface of the aluminum valve block 16;

[0066] Further, the pressure storage gas cylinder 9 is assembled correspondingly to the upper surface of the aluminum valve block 16;

[0067] Further, the gear flow meter 10 and the secondary instrument are assembled corresponding to the upper surface of the aluminum valve block 16;

[0068] Further, after the first pressure gauge 11 and the second pressure gauge 12 are connected to the conduit 13, the other end of the conduit 13 is connected to the first pressure gauge connector 5 and the second pressure gauge connector 6 and assembled correspondingly to the upper surface of the aluminum valve block 16;

[0069] Further, the aluminum valve block 16 is a rectangular parallelepiped, with arcs set at the four corners, a hydraulic oil circulation channel in the middle, and interfaces connected to the first oil outlet joint 1, the second oil outlet joint 2, the third oil outlet joint 3, the fourth oil outlet joint 4, the total oil inlet joint 14, the total oil return joint 15, the first pressure gauge joint 5, and the second pressure gauge joint 6 on the surface, and interfaces connected to 4 manual adjustment studs 17 at the bottom, and handle 23 mounting holes are measured on the two short sides. The first oil outlet joint 1, the second oil outlet joint 2, the third oil outlet joint 3, the fourth oil outlet joint 4, the first pressure gauge joint 5, the second pressure gauge joint 6, the first solenoid valve 7, the second solenoid valve 8, the pressure storage gas cylinder 9, and the gear flowmeter 10 are all assembled at the corresponding positions on its upper surface;

[0070] Four manual adjustment studs 17 are installed at the bottom of the aluminum valve block 16 and are manual adjustment knurled screws, which are tightened with the corresponding holes at the bottom of the aluminum valve block 16;

[0071] Furthermore, the electrical component 19 is installed inside the stainless steel cover 18 , the button 20 , the display instrument 21 and the sign 22 are installed outside the front of the stainless steel cover 18 , and the first pressure gauge 11 and the second pressure gauge 12 are installed outside the top of the stainless steel cover 18 .

[0072] The device has a simple structure and is easy to operate. It can meet the needs of rapid clamping and testing of various components of a helicopter, ensure the reliability of the positioning and installation process, improve work efficiency, and reduce test risks and quality hazards.

[0073] The valve control components, pressure detection components, voltage stabilizing components, flow detection components and electrical and electronic control systems of this device are all selected from well-known domestic and foreign brands, and are rationally selected and optimally configured. The entire device mainly includes the following components: solenoid valve; gear flowmeter; accumulator; precision pressure gauge. The joints, pipelines and outer covers are all made of high-quality stainless steel. The valve block is made of high-strength hard aluminum material. The total oil inlet and total oil return on the device are the connection ports between this device and other hydraulic oil sources.

[0074] When the oil enters the device, the oil flow direction is switched through the two solenoid valves inside the device, so as to achieve the purpose of not removing the external hydraulic pipeline when conducting various tests. The purpose of setting up the accumulator is to stabilize the system pressure and buffer. The pressure gauges are each left with an independent interface.

[0075] This device is used to test helicopter hydraulic components. The specific usage methods include:

[0076] Step 1: Connect the main oil inlet 14 and the main oil return port 15 of the device to the hydraulic oil inlet and return circuit of other external equipment;

[0077] Step 2: After plugging in the external power cord, turn the power button 20 on the operation panel to "on".

[0078] Position, when the green indicator light of the power button 20 lights up, the device is powered on;

[0079] Step three, according to different parts testing requirements, connect the parts oil port to the four different oil flow paths of the first oil outlet connector 1, the second oil outlet connector 2, the third oil outlet connector 3, and the fourth oil outlet connector 4 of the device, and operate the first solenoid valve 7 and the second solenoid valve 8 respectively according to the test needs, which can be combined into the following four liquid flow paths: 1).1→2; 2).2→1; 3).3→4; 4).4→3; the gear flow meter 10 on the total oil return port (15) can be used to measure the parts flow, and the process value can be displayed through the secondary instrument;

[0080] Step 4: The first pressure gauge connector 5 and the second pressure gauge connector 6 are connected to the corresponding pressure gauges through the stainless steel conduit 13 according to the part test requirements, and can be directly connected to the pressure measuring port of the tested part for measurement and reading;

[0081] The external pipe connection and usage methods for different test pieces are shown in the following figure:

[0082] Product 1:

[0083] like Figure 5 As shown, the oil flow direction and action description:

[0084] When the electromagnet at the left end of the first solenoid valve 7 is energized, the product oil port flow direction is: 1→2,

[0085] When the electromagnet at the right end of the first solenoid valve 7 is energized, the product oil port flow direction is: 2→1,

[0086] When the electromagnet at the left end of the second solenoid valve 8 is energized, the product oil port flow direction is: 3→4,

[0087] When the electromagnet at the right end of the second solenoid valve 8 is energized, the flow direction of the product oil port is: 4→3, and the flow resistance measurement product 2 is:

[0088] like Figure 6 As shown, the oil flow direction and action description:

[0089] When the electromagnet at the left end of the first solenoid valve 7 is energized, the product oil port flow direction is: A→B;

[0090] When the electromagnet at the left end of the second solenoid valve 8 is energized, the product oil port flow direction is: B→C;

[0091] When the electromagnet at the right end of the second solenoid valve 8 is energized, the product oil port flow direction is: C→B;

[0092] A three-way connector needs to be connected to the outside of port B to measure the flow resistance.

[0093] Product Three:

[0094] like Figure 7 As shown, the oil flow direction and action description:

[0095] When the electromagnet at the left end of the first solenoid valve 7 is energized, the product oil port flow direction is: A→U;

[0096] When the electromagnet at the left end of the second solenoid valve 8 is energized, the product oil port flow direction is: U→R;

[0097] When the electromagnet at the right end of the first solenoid valve 7 is energized, the product oil port flows in the following directions: A is the oil supply port, and U port is connected to the pressure gauge;

[0098] A tee joint needs to be connected to the outside of the U port.

[0099] Product 4:

[0100] like Figure 8 As shown, the oil flow direction and action description:

[0101] When the electromagnet at the left end of the first solenoid valve 7 is energized, the product oil port flow direction is: A→R;

[0102] Product B port is connected to the first pressure gauge 11;

[0103] Product C port is connected to the second pressure gauge 12;

[0104] Product 5:

[0105] like Fig. 9 As shown, the oil flow direction and action description:

[0106] When the electromagnet at the left end of the first solenoid valve 7 is energized, the product oil port flows in the direction of: A→B, and the flow rate is measured: 0.6~1.06L / min;

[0107] When the electromagnet at the right end of the first solenoid valve 7 is energized, the product oil port flow direction is: B→A.

Claims

1. A portable multifunctional fast-switching hydraulic component testing device, characterized in that: include: A first oil outlet connector (1), a second oil outlet connector (2), a third oil outlet connector (3), a fourth oil outlet connector (4), a first pressure gauge connector (5), a second pressure gauge connector (6), a first solenoid valve (7), a second solenoid valve (8), a pressure storage gas cylinder (9), a flow meter (10), a first pressure gauge (11), a second pressure gauge (12), a total oil inlet connector (14), a total oil return connector (15), and an aluminum valve block (16); The aluminum valve block (16) is a rectangular parallelepiped, with arcs at the four corners, a hydraulic oil flow channel in the middle, and a first oil outlet joint (1), a second oil outlet joint (2), a third oil outlet joint (3), a fourth oil outlet joint (4), a total oil inlet joint (14), a total oil return joint (15), a first pressure gauge joint (5), and a second pressure gauge joint (6) mounted on the surface; The main oil inlet connector (14) is divided into two channels which are respectively connected to the No. 1 interface of the first solenoid valve (7) and the No. 1' interface of the second solenoid valve (8); the main oil return connector (15) is divided into two channels which are respectively connected to the No. 2 interface of the first solenoid valve (7) and the No. 2' interface of the second solenoid valve (8); the first oil outlet connector (1) is connected to the No. 3 interface of the first solenoid valve (7), the second oil outlet connector (2) is connected to the No. 4 interface of the first solenoid valve (7), and the third oil outlet connector (3) is connected to the No. 5 interface of the first solenoid valve (7). The 3' interface of the second solenoid valve (8) is connected, and the fourth oil outlet connector (4) is connected to the 4' interface of the second solenoid valve (8); the bifurcation point of the two channels of the total oil inlet connector (14) is connected to the pressure storage gas cylinder (9), and the bifurcation point of the two channels of the total oil return connector (15) is connected to the flow meter (10); the first pressure gauge connector (5) and the second pressure gauge connector (6) are connected to the corresponding pressure gauges according to the needs of the part test, and are directly connected to the pressure measuring port of the tested part to measure and read the value.

2. The device according to claim 1, characterized in that Also includes: Stainless steel housing (18), electrical components (19), buttons (20), display instruments (21) and signboards (22); A stainless steel outer cover is arranged on the aluminum valve block, various hydraulic components and electrical components are installed inside the cover, and buttons, display instruments and signs are arranged outside the cover; a first pressure gauge (11) and a second pressure gauge (12) are installed on the top of the stainless steel outer cover (18).

3. The device according to claim 2, characterized in that The first oil outlet joint (1), the second oil outlet joint (2), the third oil outlet joint (3), the fourth oil outlet joint (4), the main oil inlet (14), and the main oil return port (15) are all cylindrical, with a through hole in the middle of the cylinder, pipe threads at both ends of the outer surface of the cylinder, and a hexagonal protrusion in the middle; The first pressure gauge joint (5) and the second pressure gauge joint (6) are cylindrical, with a through hole in the middle of the cylinder, a pipe thread at one end of the outer surface of the cylinder, a tapered thread at one end of the outer surface of the cylinder, and a hexagonal convex block in the middle.

4. The device according to claim 2, characterized in that The buttons include a first solenoid valve switch (24), a first solenoid valve switch (25) and a power button (20); the first solenoid valve switch (24) and the first solenoid valve switch (25) are used to control the switching and selection of the corresponding solenoid valves; the power button (20) is used to control whether the entire device is powered on or not.

5. A portable multifunctional fast-switching hydraulic component testing method, characterized in that: include: Step 1, connecting the total oil inlet (14) and the total oil return port (15) of the portable multifunctional fast-switching hydraulic component testing device described in any one of claims 1 to 4 to the hydraulic oil inlet and return circuit of other external equipment; Step 2: After plugging in the external power cord, turn the power button (20) on the operation panel to the "on" position. When the green indicator light of the power button (20) lights up, the device is powered on. Step 3: According to different parts testing requirements, the oil port of the parts is connected to the different oil flow paths of the first oil outlet connector (1), the second oil outlet connector (2), the third oil outlet connector (3), and the fourth oil outlet connector (4) of the device, and the first solenoid valve (7) and the second solenoid valve (8) are respectively operated according to the test requirements to form the following four liquid flow paths: 1). The first path: oil enters the first oil outlet connector (1), passes through the first solenoid valve (7), and exits the second oil outlet connector (2); 2) The second path: oil enters the second oil outlet connector (2), passes through the first solenoid valve (7), and then exits the first oil outlet connector (1); 3). The third path: oil enters the third oil outlet connector (3), passes through the second solenoid valve (8), and exits the fourth oil outlet connector (4); 4). The fourth path: oil enters the fourth oil outlet connector (4), passes through the second solenoid valve (8), and exits the third oil outlet connector (3); The above-mentioned liquid flow paths all pass through the gear flow meter (10) on the total oil return port (15) to measure the flow of parts, and the process value is displayed through the secondary instrument; Step 4: Connect the first pressure gauge connector (5) and the second pressure gauge connector (6) to the corresponding pressure gauges through the stainless steel conduit (13) according to the part testing requirements, and directly connect them to the pressure measuring port of the tested part to perform measurement and reading.

6. The method according to claim 5, characterized in that If the product under test has four oil ports, and port 1 of the product is connected to the first oil outlet connector (1), port 2 of the product is connected to the second oil outlet connector (2), port 3 of the product is connected to the third oil outlet connector (3), and port 4 of the product is connected to the fourth oil outlet connector (4); Correspondingly, the oil flow direction and action description: When the electromagnet corresponding to the first oil outlet connector in the first solenoid valve (7) is energized and the electromagnet corresponding to the second oil outlet connector is not energized, the oil flows from the first port through the first path of the device into the second port; When the electromagnet corresponding to the second oil outlet connector in the first solenoid valve (7) is energized and the electromagnet corresponding to the first oil outlet connector is not energized, the oil flows from the second port through the second path of the device into the first port; When the electromagnet corresponding to the third oil outlet connector in the second solenoid valve (8) is energized and the electromagnet corresponding to the fourth oil outlet connector is not energized, the oil flows from the third port through the third path of the device into the fourth port; When the electromagnet corresponding to the fourth oil outlet connector in the second solenoid valve (8) is energized and the electromagnet corresponding to the third oil outlet connector is not energized, the oil flows from the fourth port through the fourth path of the device into the third port; the flow resistance is measured.

7. The method according to claim 5, characterized in that If the product under test has three oil ports: port A, port B and port C; port A is connected to the first oil outlet connector (1), port C is connected to the fourth oil outlet connector (4), and port B is simultaneously connected to the second oil outlet connector (2) and the third oil outlet connector (3); Correspondingly, the oil flow direction and action description: When the electromagnet corresponding to the first oil outlet connector in the first solenoid valve (7) is energized and the electromagnet corresponding to the second oil outlet connector is not energized, the oil flows from the A port through the first path into the B port; When the electromagnet corresponding to the third oil outlet connector in the second solenoid valve (8) is energized and the electromagnet corresponding to the fourth oil outlet connector is not energized, the oil flows from the B port through the third path into the C port; When the electromagnet corresponding to the fourth oil outlet connector in the second solenoid valve (8) is energized and the electromagnet corresponding to the third oil outlet connector is not energized, the oil flows from the C port through the third path into the B port; A three-way connector needs to be connected to the outside of port B to measure the flow resistance.

8. The method according to claim 5, characterized in that If the product to be tested has three oil ports: port A, port U and port R; port A is connected to the first oil outlet connector (1), port R is connected to the fourth oil outlet connector (4), and port U is simultaneously connected to the second oil outlet connector (2), the third oil outlet connector (3) and the first pressure gauge connector (5); When the electromagnet corresponding to the first oil outlet connector in the first solenoid valve (7) is energized and the electromagnet corresponding to the second oil outlet connector is not energized, the oil flows from the A port through the first path into the U port; When the electromagnet corresponding to the third oil outlet connector in the second solenoid valve (8) is energized and the electromagnet corresponding to the fourth oil outlet connector is not energized, the product oil port flow direction is: the oil flows from the U port through the third path into the R port; When the electromagnet corresponding to the first oil outlet connector in the first solenoid valve (7) is not energized and the electromagnet corresponding to the second oil outlet connector is energized, port A is the oil supply port and port U is connected to a pressure gauge; A tee joint needs to be connected to the outside of the U port.

9. The method according to claim 5, characterized in that If the product under test has 4 oil ports: A port, R port, B port and C port; The A port is connected to the first oil outlet connector (1), the R port is connected to the second oil outlet connector (2), the B port is connected to the first pressure gauge connector (5), and the C port is connected to the second pressure gauge connector (6); When the electromagnet corresponding to the first oil outlet connector in the first solenoid valve (7) is energized and the electromagnet corresponding to the second oil outlet connector is not energized, the oil flows from the A port through the first path into the U port; Product B port is connected to a first pressure gauge (11); Product port C is connected to a second pressure gauge (12).

10. The method according to claim 5, characterized in that If the product to be tested has two oil ports: port A and port B; port A is connected to the first oil outlet connector (1), and port B is connected to the second oil outlet connector (2), Oil flow direction and action description: When the electromagnet corresponding to the first oil outlet connector in the first solenoid valve (7) is energized and the electromagnet corresponding to the second oil outlet connector is not energized, oil is produced and the oil flows from the A port through the first path into the B port; and the flow rate is measured; When the electromagnet corresponding to the first oil outlet connector in the first solenoid valve (7) is not energized and the electromagnet corresponding to the second oil outlet connector is energized, the oil flows from the B port into the A port via the second path.

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