Oil pump performance test board

Abstract

The invention discloses an oil pump performance test bench, which comprises a frame body, a pipeline assembly arranged on the frame body, a test bench frame, a test assembly arranged on the test bench frame and a control system, and is characterized in that the pipeline assembly is connected to an oil inlet and an oil outlet of an oil pump to be tested; the pipeline assembly is sequentially provided with a pneumatic three-way valve and a pneumatic two-way valve in the direction of an oil inlet of the oil pump to be tested, the rest valve port of the pneumatic three-way valve is connected with a second diaphragm pump, the other end of the second diaphragm pump is connected with a main oil tank, the testing assembly comprises a connecting assembly, the connecting assembly is provided with a transmission shaft, and the transmission shaft is connected with the pneumatic three-way valve. The transmission shaft can extend into the oil pump to be tested and drive the oil pump to be tested to rotate, and the control system displays and records test data of the oil pump to be tested. The device has the advantages of being simple in structure, convenient to operate and comprehensive in testing.

Description

Technical Field

[0001] The invention belongs to the field of automobile oil pump production testing, and in particular relates to an oil pump performance testing platform. Background Art

[0002] The oil pump is one of the most important components in the internal combustion engine. It is responsible for the key task of transporting oil from the oil pan to the various moving parts of the engine. Its main function is to provide the necessary lubrication and cooling to ensure that the engine can get enough lubricating oil under various operating conditions. This process is essential to reduce friction and wear, and can effectively prevent engine overheating and component damage, thereby extending the service life of the engine and improving its working efficiency. Therefore, the performance test of the oil pump is becoming more and more important in the mass production of oil pumps.

[0003] Chinese patent CN201420164999.9 discloses a performance testing device for an automobile transmission oil pump, including a frame, an industrial control computer, a torque tester, a torque test shaft, a flow monitor, an oil pump assembly and a support frame, wherein the frame is provided with a test platform, the support frame is provided on the test platform, the oil pump assembly is installed on the support frame, a test mounting seat is also provided on the frame, the torque test shaft is installed in the test mounting seat, a drive motor for driving the torque test shaft to rotate is provided above the test mounting seat, the torque tester is installed on the torque test shaft, the flow monitor is fixed on the test mounting seat, and is located at the gas outlet of the oil pump assembly during the test, and the industrial control computer data is connected to control the torque tester, the torque test shaft, the flow monitor, the oil pump assembly and the drive motor. This device can only simply test the torque and output flow of the oil pump.

[0004] Chinese patent CN201410836564.9 discloses an oil pump performance test device, including a workbench, an oil tank, a control module and a data display module. The oil tank is connected to the oil suction port of the oil pump to be tested, and the oil outlet of the oil pump to be tested is connected to an oil drain pipe, and the outlet end of the oil drain pipe is connected to the main oil pipe and the return oil pipe, and the outlets of the main oil pipe and the return oil pipe are both connected to the oil tank; the oil drain pipe is connected to a flow sensor, a first pressure sensor and a first pressure regulating valve in sequence along the oil discharge direction, the main oil pipe is connected to a second pressure sensor, and the return oil pipe is connected to a second pressure regulating valve. This device mainly simulates the relationship between the outlet pressure and flow of the oil pump at different temperatures, and cannot test the torque of the oil pump.

[0005] Therefore, an oil pump performance test bench is needed that can detect the output flow and torque of the oil pump at different oil temperatures, different outlet pressures, and different speeds. Summary of the invention

[0006] In view of this, the present invention aims at the above-mentioned problems existing in the prior art and provides an oil pump performance test bench to solve the problem that the detection results of the existing oil pump performance test bench are incomplete.

[0007] The technical solution of the present invention is to provide an oil pump performance test bench, including a frame, a pipeline assembly installed on the frame, a test bench, a test assembly installed on the test bench and a control system, the pipeline assembly is connected to the oil inlet and oil outlet of the oil pump to be tested, the pipeline assembly is sequentially provided with a pneumatic three-way valve and a pneumatic two-way valve along the oil inlet direction of the oil pump to be tested, the remaining valve port of the pneumatic three-way valve is connected to a second diaphragm pump, the other end of the second diaphragm pump is connected to a main oil tank, the test assembly includes a connecting assembly, a transmission shaft is provided on the connecting assembly, the transmission shaft can be extended into the oil pump to be tested and drive the oil pump to be tested to rotate, and the control system displays and records the test data of the oil pump to be tested.

[0008] Preferably, the pipeline assembly includes: a main oil tank, an electric regulating valve, a flow meter, an outlet pressure sensor, an inlet pressure sensor, a pneumatic three-way valve, a pneumatic two-way valve, a first diaphragm pump, a second diaphragm pump, a heater, a thermometer, an auxiliary oil tank, a first oil collecting tank and a second oil collecting tank, the first oil collecting tank and the second oil collecting tank are provided with connecting holes at the bottom, the first oil collecting tank is located below the pipeline assembly, the second oil collecting tank is located below the test assembly, the first oil collecting tank and the second oil collecting tank are connected to the oil inlet of the auxiliary oil tank through a plastic hose, the horizontal positions of the first oil collecting tank and the second oil collecting tank are higher than the auxiliary oil tank, and the oil in the auxiliary oil tank is recovered to the main oil tank through the first diaphragm pump.

[0009] Preferably, the test bench comprises: a lower bench, a platform mounted on the lower bench, an upper bench mounted on the platform, and a touch screen mounted on the upper bench. The lower bench is a welded frame, the upper bench is an aluminum profile, and the touch screen displays the test data of the oil pump to be tested.

[0010] Preferably, the test assembly includes: a test base plate arranged on the table top, a test tooling passing through the test base plate, a vertical moving assembly arranged on the test base plate, a connecting assembly fixedly mounted on the vertical moving assembly, and a transmission assembly fixedly mounted on the connecting assembly.

[0011] Preferably, the test fixture includes: a second column, a fixture base plate, a first quick-change plate, an armrest, a through-shooting sensor, a positioning column, an oil pump to be tested, a second limit block, a polyurethane pressure block, a clamping block, an oil port connecting block, a second cylinder, a third column, a second cylinder mounting plate, a lock nut joint and a flange bellows. The positioning column is a cylindrical pin and a diamond pin with a step, which are used to position and support the oil pump to be tested. The through-shooting sensor is arranged on both sides of the oil pump to be tested to detect whether the oil pump to be tested is placed in place. The polyurethane pressure block is processed with oil inlet and oil outlet of the oil pump to be tested. The polyurethane pressure block is fixedly connected to the oil port connecting block through the clamping block, the second limit block is internally processed with an inner hole with the same contour as the polyurethane pressure block, which is used for guiding the polyurethane pressure block, one end of the oil port connecting block is connected to the polyurethane pressure block, and the other end is connected to the flange bellows, the flange bellows connects the oil inlet and the oil outlet of the pipeline assembly, the lock nut joint is respectively connected to the inlet pressure sensor and the outlet pressure sensor, and the second cylinder can push the polyurethane pressure block to move in the vertical direction.

[0012] Preferably, the vertical moving assembly includes: a first mounting plate fixedly mounted on the test base plate, a pad and a vertical plate fixedly mounted on the first mounting plate, a first cylinder mounting plate fixedly mounted at one end of the pad, a linear slide fixedly mounted on the pad, a slider mounted on the linear slide, and a slide fixedly mounted on the slider, a connecting block fixedly mounted on the slide, one end of the connecting block is connected to a floating joint, the other end of the floating joint is fixedly connected to the output end of the first cylinder, an oil pressure buffer is arranged on the vertical plate, and the first cylinder pushes the slider to slide in the vertical direction.

[0013] Preferably, the connecting assembly includes: a fixed base plate fixedly connected to the skateboard, a first column fixedly connected to the fixed base plate, a torque sensor fixedly connected to the first column, a second coupling fixedly connected to the output end of the torque sensor and a connecting shaft fixedly connected to the other end of the second coupling, the connecting shaft extends into a sleeve and is fixedly connected to the sleeve through a hinge pin, a slot is processed at the other end of the sleeve, a transmission shaft is arranged in the slot, a wedge is installed at one end of the transmission shaft, the wedge matches the slot, a spring is arranged between the transmission shaft and the sleeve, a first limit block is arranged at one end of the sleeve, the transmission shaft can slide inside the sleeve, a gear-shaped protrusion is processed at the front end of the transmission shaft for meshing with the inner rotor of the oil pump to be tested, and the torque sensor is used to detect the input torque and speed of the oil pump to be tested.

[0014] Preferably, the connecting assembly also includes: a third bearing cover plate, on which an O-ring is arranged. When the transmission shaft extends into the oil pump to be tested, the third bearing cover plate is tightly attached to the upper surface of the oil pump to be tested, the O-ring is compressed, and the shaft hole portion of the oil pump to be tested forms a seal.

[0015] Preferably, the transmission assembly includes: a servo motor, a second mounting plate and a torque limiter passing through the second mounting plate, a synchronous belt drive is used between the servo motor and the torque limiter, the output end of the servo motor is connected to a first coupling, and the torque limiter provides overload protection for the servo motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shown is a schematic diagram of an oil pump test bench according to the present invention.

[0017] Figure 2 Shown is a schematic diagram of a pipeline assembly of the present invention.

[0018] Figure 3 Shown is a schematic diagram of a test assembly of the present invention.

[0019] Figure 4 and Figure 5 Shown is a schematic diagram of the test tooling of the present invention.

[0020] Figure 6 Shown is a schematic diagram of the vertical moving assembly of the present invention.

[0021] Figure 7 Shown is a schematic diagram of the connection components of the present invention.

[0022] Figure 8 Shown is a partial enlarged cross-sectional view of a connection assembly of the present invention.

[0023] Fig. 9 Shown is a partial schematic diagram of the transmission shaft of the present invention.

[0024] Fig.10 Shown is a schematic diagram of a transmission assembly of the present invention.

[0025] Component number description, 1, frame, 2, pipeline assembly, 3, test bench, 4, test assembly, 5, control system, 2-1, main oil tank, 2-2, electric regulating valve, 2-3, flow meter, 2-4, outlet pressure sensor, 2-5, inlet pressure sensor, 2-6, pneumatic three-way valve, 2-7, pneumatic two-way valve, 2-8, first diaphragm pump, 2-9, second diaphragm pump, 2-10, heater, 2-11, thermometer, 2-12, auxiliary oil tank, 2-13, first oil collecting pool, 2-14, second oil collecting pool, 3-1, lower bench, 3 -2, table, 3-3, upper stand, 3-4, touch screen, 4-1, test base plate, 4-2, test fixture, 4-3, connection assembly, 4-4, vertical movement assembly, 4-6, transmission assembly, 4-2-1, second column, 4-2-2, fixture base plate, 4-2-3, first quick-change plate, 4-2-4, handrail, 4-2-5, through-beam sensor, 4-2-6, positioning column, 4-2-7, oil pump to be tested, 4-2-8, second limit block, 4-2-9, polyurethane pressure block, 4-2-10, clamp block, 4-2-11, oil Connecting block, 4-2-12, second cylinder, 4-2-13, third column, 4-2-14, second cylinder mounting plate, 4-2-15, lock nut joint, 4-2-16, flange bellows, 4-3-1, fixed base plate, 4-3-2, first column, 4-3-3, torque sensor, 4-3-4, second coupling, 4-3-5, connecting shaft, 4-3-6, hinge pin, 4-3-7, sleeve, 4-3-8, first limit block, 4-3-9, transmission shaft, 4-3-10, wedge block, 4-3-12, spring, 4- 3-13, third bearing cover plate, 4-3-14, O-ring, 4-4-1, first mounting plate, 4-4-2, pad, 4-4-3, vertical plate, 4-4-4, first cylinder mounting plate, 4-4-5, linear guide rail, 4-4-6, slider, 4-4-7, slide plate, 4-4-8, connecting block, 4-4-9, floating joint, 4-4-10, first cylinder, 4-4-11, hydraulic buffer, 4-6-1, servo motor, 4-6-2, second mounting plate, 4-6-3, torque sensor, 4-6-4, first coupling. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details. In addition, the drawings of the present invention are not drawn completely and accurately according to the actual scale for the purpose of illustration, which is explained here.

[0028] like Figure 1 As shown, an oil pump performance test bench comprises a frame 1, a pipeline assembly 2 installed on the frame 1, a test bench 3, a test assembly 4 installed on the test bench 3 and a control system 5, wherein the pipeline assembly 2 is connected to the oil inlet and the oil outlet of the oil pump 4-2-7 to be tested, and the pipeline assembly 2 is provided with a pneumatic three-way valve 2-6 and a pneumatic two-way valve 2-7 in sequence along the oil inlet direction of the oil pump 4-2-7 to be tested, and the remaining valve port of the pneumatic three-way valve 2-6 is connected to a second diaphragm pump 2-9, and the other end of the second diaphragm pump 2-9 is connected to the main oil tank 2-1, and the test assembly 4 comprises a connecting assembly 4-3, and a transmission shaft 4-3-9 is provided on the connecting assembly 4-3, and the transmission shaft 4-3-9 can extend into the oil pump 4-2-7 to be tested and drive the oil pump 4-2-7 to be tested to rotate, and the control system 5 displays and records the test data of the oil pump 4-2-7 to be tested.

[0029] The test bench includes a lower bench 3-1, a table 3-2 installed on the lower bench 3-1, an upper bench 3-3 installed on the table 3-2, and a touch screen 3-4 installed on the upper bench 3-3. The lower bench 3-1 is a welding frame, the upper bench 3-3 is an aluminum profile, and the touch screen 3-4 displays the test data of the oil pump 4-2-7 to be tested.

[0030] like Figure 2 The specific structure of the pipeline assembly is shown in the figure. The pipeline assembly includes a main oil tank 2-1, an electric regulating valve 2-2, a flow meter 2-3, an outlet pressure sensor 2-4, an inlet pressure sensor 2-5, a pneumatic three-way valve 2-6, a pneumatic two-way valve 2-7, a first diaphragm pump 2-8, a second diaphragm pump 2-9, a heater 2-10, a thermometer 2-11, an auxiliary oil tank 2-12, a first oil collecting pool 2-13 and a second oil collecting pool 2-14. The first oil collecting pool 2-13 and the second oil collecting pool 2-14 are provided with connecting holes at the bottom. The first oil collecting tank 2-13 is located below the pipeline assembly 2, and the second oil collecting tank 2-14 is located below the test assembly 4. The first oil collecting tank 2-13 and the second oil collecting tank 2-14 are connected to the oil inlet of the auxiliary oil tank 2-12 through a plastic hose. The horizontal positions of the first oil collecting tank 2-13 and the second oil collecting tank 2-14 are higher than the auxiliary oil tank 2-12. The oil in the auxiliary oil tank 2-12 is recovered to the main oil tank 2-1 through the first diaphragm pump 2-8.

[0031] like Figure 3The figure shows the specific structure of the test assembly. The test assembly includes a test base plate 4-1 disposed on the table 3-2, a test fixture 4-2 passing through the test base plate 4-1, a vertical moving assembly 4-4 disposed on the test base plate 4-1, a connecting assembly 4-3 fixedly mounted on the vertical moving assembly 4-4, and a transmission assembly 4-6 fixedly mounted on the connecting assembly 4-3.

[0032] like Figure 4 and Figure 5 The test fixture includes a second column 4-2-1, a fixture base plate 4-2-2, a first quick-change plate 4-2-3, a handrail 4-2-4, a through-beam sensor 4-2-5, a positioning column 4-2-6, an oil pump to be tested 4-2-7, a second limit block 4-2-8, a polyurethane pressure block 4-2-9, a clamp block 4-2-10, an oil port connection block 4-2-11, a second cylinder 4-2-12, a third column 4-2-13, a second air cylinder 4-2-14, a second air cylinder 4-2-15, a second air cylinder 4-2-16, a third column 4-2-17, a second air cylinder 4-2-18, a second air cylinder 4-2-19, a third column 4-2-20, a second air cylinder 4-2-21, a second air cylinder 4-2-22, a third column 4-2-23, a second air cylinder 4-2-24, a second air cylinder 4-2-25, a second air cylinder 4-2-26, a second air cylinder 4-2-27, a second air cylinder 4-2-28, a second air cylinder 4-2-3, a second air cylinder 4-2-4, a second air cylinder 4-2-5, a second air cylinder 4-2-6, a second air cylinder 4-2-7, a second air cylinder 4-2-8, a second air cylinder 4-2-9, a second air cylinder 4-2-10, a second air cylinder 4-2-11, a second air cylinder 4-2-12, a third column 4-2-13, a second air cylinder 4-2-14, a second air cylinder 4-2-15, a second air cylinder 4-2-16, a second air cylinder 4-2-17, a second air cylinder 4-2 The cylinder mounting plate 4-2-14, the lock nut joint 4-2-15 and the flange bellows 4-2-16, the positioning column 4-2-6 is a cylindrical pin and a diamond pin with a step, which is used to position and support the oil pump 4-2-7 to be tested, and the shooting sensor 4-2-5 is arranged on both sides of the oil pump 4-2-7 to be tested, and is used to detect whether the oil pump 4-2-7 to be tested is placed in place, and the polyurethane block 4-2-9 is processed with The polyurethane pressure block 4-2-9 is fixedly connected to the oil port connection block 4-2-11 through the clamp block 4-2-10, and the second limit block 4-2-8 is internally processed with an inner hole with the same contour as the polyurethane pressure block 4-2-9, which is used for guiding the polyurethane pressure block 4-2-9. One end of the oil port connection block 4-2-11 is connected to the polyurethane pressure block 4-2-9, and the other end is connected to the flange bellows 4-2-16. The flange bellows 4-2-16 connects the oil inlet and outlet of the pipeline assembly 2. The lock nut 4-2-15 is respectively connected to the inlet pressure sensor 2-5 and the outlet pressure sensor 2-4. The second cylinder 4-2-12 can push the polyurethane pressure block 4-2-9 to move in the vertical direction.

[0033] like Figure 6The figure shows the specific structure of the vertical moving assembly. The vertical moving assembly includes a first mounting plate 4-4-1 fixedly arranged on the test base plate 4-1, a pad 4-4-2 and a vertical plate 4-4-3 fixedly arranged on the first mounting plate, a first cylinder mounting plate 4-4-4 fixedly arranged at one end of the pad 4-4-2, a linear slide 4-4-5 fixedly arranged on the pad 4-4-2, a slider 4-4-6 mounted on the linear slide 4-4-5, a slide plate 4-4-7 fixedly arranged on the slider 4-4-6, a connecting block 4-4-8 fixedly arranged on the slide plate 4-4-7, one end of the connecting block 4-4-8 is connected to a floating joint 4-4-9, the other end of the floating joint 4-4-9 is fixedly connected to the output end of the first cylinder 4-4-10, an oil pressure buffer 4-4-11 is arranged on the vertical plate 4-4-3, and the first cylinder 4-4-10 pushes the slider 4-4-7 to slide in the vertical direction.

[0034] like Figure 7 , Figure 8 and Fig. 9 The figure shows the specific structure of the connection assembly. The connection assembly includes a fixed base plate 4-3-1 fixedly connected to the slide plate 4-4-7, a first column 4-3-2 fixedly connected to the fixed base plate 4-3-1, a torque sensor 4-3-3 fixedly connected to the first column 4-3-2, a second coupling 4-3-4 fixedly connected to the output end of the torque sensor 4-3-3, and a connecting shaft 4-3-5 fixedly connected to the other end of the second coupling 4-3-4. The connecting shaft 4-3-5 extends into the sleeve 4-3-7 and is fixedly connected to the sleeve 4-3-7 through a hinge pin 4-3-6. The other end of the sleeve 4-3-7 is processed with a slot. A transmission shaft 4-3-9 is arranged in the slot, a wedge block 4-3-10 is installed at one end of the transmission shaft 4-3-9, and the wedge block 4-3-10 matches the slot, a spring 4-3-12 is arranged between the transmission shaft 4-3-9 and the sleeve 4-3-7, a first limit block 4-3-8 is arranged at one end of the sleeve 4-3-7, the transmission shaft 4-3-9 can slide inside the sleeve 4-3-7, a gear-shaped protrusion is processed at the front end of the transmission shaft 4-3-9, which is used to mesh with the inner rotor of the oil pump 4-2-7 to be tested, and the torque sensor 4-3-3 is used to detect the input torque and rotation speed of the oil pump 4-2-7 to be tested.

[0035] The connecting assembly also includes a third bearing cover plate 4-3-13, on which an O-ring 4-3-14 is provided. When the transmission shaft 4-3-9 extends into the oil pump to be tested 4-2-7, the third bearing cover plate 4-3-13 is tightly attached to the upper surface of the oil pump to be tested 4-2-7, the O-ring 4-3-14 is compressed, and the shaft hole portion of the oil pump to be tested 4-2-7 forms a seal.

[0036] like Fig.10 The figure shows the specific structure of the transmission assembly. The transmission assembly includes a servo motor 4-6-1, a second mounting plate 4-6-2 and a torque limiter 4-6-3 passing through the second mounting plate 4-6-2. A synchronous belt drive is used between the servo motor 4-6-1 and the torque limiter 4-6-3. The output end of the servo motor 4-6-1 is connected to the first coupling 4-6-4. The torque limiter 4-6-3 provides overload protection for the servo motor 4-6-1.

[0037] The specific working principle is as follows: manually place the oil pump 4-2-7 to be tested on the test fixture 4-2, and use the positioning column 4-2-6 to accurately position and support it. After the operator presses the start button with both hands, the first cylinder 4-4-10 pushes the transmission shaft 4-3-9 and the third bearing cover plate 4-3-13 to move downward, so that the transmission shaft 4-3-9 is inserted into the oil pump 4-2-7 to be tested, and the third bearing cover plate 4-3-13 is tightly attached to the upper surface of the oil pump 4-2-7 to be tested, and the O-ring 4-3-14 seals the shaft hole part of the oil pump 4-2-7 to be tested. Subsequently, the second cylinder 4-2-12 pushes the polyurethane pressure block 4-2-9 to move upward to seal the oil inlet and outlet of the oil pump 4-2-7 to be tested. At this time, the pneumatic two-way valve 2-7 is closed, and the pneumatic three-way valve 2-6 opens the branch connected to the second diaphragm pump 2-9, and the second diaphragm pump 2-9 is started to transport the oil in the main oil tank 2-1 to the oil pump 4-2-7 to be tested, so that it is filled with oil. Then, the second diaphragm pump 2-9 is closed and the pneumatic two-way valve 2-7 is opened, and the pneumatic three-way valve 2-6 is switched to another branch, and the servo motor 4-6-1 is started to drive the transmission shaft 4-3-9 and the oil pump 4-2-7 to be tested to rotate. The rotation of the oil pump 4-2-7 to be tested causes the oil to enter the oil pump 4-2-7 to be tested from the main oil tank 2-1 through the pneumatic two-way valve 2-7, the pneumatic three-way valve 2-6, and the inlet pressure sensor 2-5 in turn. After being pressurized by the oil pump 4-2-7 to be tested, it passes through the outlet pressure sensor 2-4, the flow meter 2-3, and the electric regulating valve 2-2 in turn, and finally returns to the main oil tank 2-1. The test results will be displayed on the touch screen 3-4. By adjusting the electric control valve 2-2, the heater 2-10 and the servo motor 4-6-1, the flow rate and data of the oil pump 4-2-7 to be tested under different outlet pressures, temperatures and speeds can be measured.

[0038] The above only describes the preferred embodiments of the present invention, but it should not be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. In short, all changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

Claims

1. An oil pump performance test bench, comprising a frame (1), a pipeline assembly (2) mounted on the frame (1), a test bench (3), a test assembly (4) mounted on the test bench (3), and a control system (5), characterized in that: The pipeline assembly (2) is connected to the oil inlet and the oil outlet of the oil pump (4-2-7) to be tested. The pipeline assembly (2) is provided with a pneumatic three-way valve (2-6) and a pneumatic two-way valve (2-7) in sequence along the oil inlet direction of the oil pump (4-2-7) to be tested. The remaining valve port of the pneumatic three-way valve (2-6) is connected to a second diaphragm pump (2-9). The other end of the second diaphragm pump (2-9) is connected to the main oil tank (2-1). The test assembly (4) includes a connecting assembly (4-3). A transmission shaft (4-3-9) is provided on the connecting assembly (4-3). The transmission shaft (4-3-9) can extend into the oil pump (4-2-7) to be tested and drive the oil pump (4-2-7) to be tested to rotate. The control system (5) displays and records the test data of the oil pump (4-2-7) to be tested.

2. The oil pump performance test bench according to claim 1, characterized in that: The pipeline assembly (2) comprises a main oil tank (2-1), an electric regulating valve (2-2), a flow meter (2-3), an outlet pressure sensor (2-4), an inlet pressure sensor (2-5), a pneumatic three-way valve (2-6), a pneumatic two-way valve (2-7), a first diaphragm pump (2-8), a second diaphragm pump (2-9), a heater (2-10), a thermometer (2-11), an auxiliary oil tank (2-12), a first oil collecting tank (2-13) and a second oil collecting tank (2-14), wherein the first oil collecting tank (2-13) and the second oil collecting tank (2-14) are provided with The first oil collecting tank (2-13) is located below the pipeline assembly (2), the second oil collecting tank (2-14) is located below the test assembly (4), the first oil collecting tank (2-13) and the second oil collecting tank (2-14) are connected to the oil inlet of the auxiliary oil tank (2-12) through a plastic hose, the horizontal positions of the first oil collecting tank (2-13) and the second oil collecting tank (2-14) are higher than the auxiliary oil tank (2-12), and the oil in the auxiliary oil tank (2-12) is recovered to the main oil tank (2-1) through the first diaphragm pump (2-8).

3. The oil pump performance test bench according to claim 1, characterized in that: The test bench (3) comprises a lower bench (3-1), a table plate (3-2) mounted on the lower bench (3-1), an upper bench (3-3) mounted on the table plate (3-2), and a touch screen (3-4) mounted on the upper bench (3-3).

4. The oil pump performance test bench according to claim 1, characterized in that: The test assembly (4) comprises a test base plate (4-1) arranged on the table plate (3-2), a test fixture (4-2) passing through the test base plate (4-1), a vertical moving assembly (4-4) arranged on the test base plate (4-1), a connecting assembly (4-3) fixedly mounted on the vertical moving assembly (4-4), and a transmission assembly (4-6) fixedly mounted on the connecting assembly (4-3).

5. The oil pump performance test bench according to claims 2 and 4, characterized in that: The test fixture (4-2) comprises a second column (4-2-1), a fixture base plate (4-2-2), a first quick-change plate (4-2-3), an armrest (4-2-4), a beam sensor (4-2-5), a positioning column (4-2-6), an oil pump to be tested (4-2-7), a second limit block (4-2-8), a polyurethane pressure block (4-2-9), a clamping block (4-2-10), an oil port connection block (4-2-11), a second cylinder (4-2-12), a third column ( 4-2-13), a second cylinder mounting plate (4-2-14), a lock nut joint (4-2-15) and a flange bellows (4-2-16), the positioning column (4-2-6) is a cylindrical pin and a diamond pin with a step, which are used to position and support the oil pump to be tested (4-2-7), the corresponding sensor (4-2-5) is arranged on both sides of the oil pump to be tested (4-2-7), and is used to detect whether the oil pump to be tested (4-2-7) is placed in place, and the polyurethane pressing block (4 -2-9) is processed with a through hole with the same diameter as the oil inlet and oil outlet of the oil pump (4-2-7) to be tested, the polyurethane pressure block (4-2-9) is fixedly connected to the oil port connection block (4-2-11) through the clamp block (4-2-10), and the second limit block (4-2-8) is processed with an inner hole with the same contour as the polyurethane pressure block (4-2-9) for guiding the polyurethane pressure block (4-2-9). The oil port connection block (4-2-11 ) one end is butt-jointed with the polyurethane pressing block (4-2-9), and the other end is connected with the flange bellows (4-2-16); the flange bellows (4-2-16) is connected with the oil inlet and the oil outlet of the pipeline assembly (2); the lock nut joint (4-2-15) is respectively connected with the inlet pressure sensor (2-5) and the outlet pressure sensor (2-4); the second cylinder (4-2-12) can push the polyurethane pressing block (4-2-9) to move in the vertical direction.

6. The oil pump performance test bench according to claim 4, characterized in that: The vertical moving assembly (4-4) comprises a first mounting plate (4-4-1) fixedly arranged on the test base plate (4-1), a backing plate (4-4-2) and a vertical plate (4-4-3) fixedly arranged on the first mounting plate (4-4-1), a first cylinder mounting plate (4-4-4) fixedly arranged at one end of the backing plate (4-4-2), a linear slide rail (4-4-5) fixedly arranged on the backing plate (4-4-2), a slider (4-4-6) mounted on the linear slide rail (4-4-5), and a first cylinder mounting plate (4-4-4) fixedly arranged at one end of the backing plate (4-4-2). A slide plate (4-4-7) on the slider (4-4-6) is fixedly mounted with a connecting block (4-4-8), one end of the connecting block (4-4-8) is connected with a floating joint (4-4-9), the other end of the floating joint (4-4-9) is fixedly connected to the output end of the first cylinder (4-4-10), an oil pressure buffer (4-4-11) is arranged on the vertical plate (4-4-3), and the first cylinder (4-4-10) pushes the slide plate (4-4-7) to slide in the vertical direction.

7. An oil pump performance test bench according to claims 4 and 6, characterized in that: The connecting assembly (4-3) comprises a fixed base plate (4-3-1) fixedly connected to the slide plate (4-4-7), a first column (4-3-2) fixedly connected to the fixed base plate (4-3-1), a torque sensor (4-3-3) fixedly connected to the first column (4-3-2), a second coupling (4-3-4) fixedly connected to the output end of the torque sensor (4-3-3), and a connecting shaft (4-3-5) fixedly connected to the other end of the second coupling (4-3-4), wherein the connecting shaft (4-3-5) extends into The sleeve (4-3-7) is inside the sleeve (4-3-7) and is fixedly connected to the sleeve (4-3-7) through a hinge pin (4-3-6); a slot is processed at the other end of the sleeve (4-3-7); a transmission shaft (4-3-9) is arranged in the slot; a wedge (4-3-10) is installed at one end of the transmission shaft (4-3-9); the wedge (4-3-10) matches the slot; a spring (4-3-12) is arranged between the transmission shaft (4-3-9) and the sleeve (4-3-7); and a first limit block (4-3-8) is arranged at one end of the sleeve (4-3-7).

8. The oil pump performance test bench according to claim 7, characterized in that: The connecting assembly (4-3) further comprises a third bearing cover plate (4-3-13), on which an O-ring (4-3-14) is arranged. When the transmission shaft (4-3-9) extends into the oil pump to be tested (4-2-7), the third bearing cover plate (4-3-13) is tightly attached to the upper surface of the oil pump to be tested (4-2-7), the O-ring (4-3-14) is compressed, and the shaft hole portion of the oil pump to be tested (4-2-7) is sealed.

9. The oil pump performance test bench according to claim 4, characterized in that: The transmission assembly (4-6) comprises a servo motor (4-6-1), a second mounting plate (4-6-2) and a torque limiter (4-6-3) passing through the second mounting plate (4-6-2); a synchronous belt transmission is used between the servo motor (4-6-1) and the torque limiter (4-6-3); an output end of the servo motor (4-6-1) is connected to a first coupling (4-6-4); and the torque limiter (4-6-3) provides overload protection for the servo motor (4-6-1).

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