Oil pump motor performance test tool

Abstract

The invention discloses an oil pump motor performance test tool, and particularly relates to the technical field of oil pump motor test.The oil pump motor performance test tool comprises a test cabinet, a hydraulic oil tank is arranged in the test cabinet, a first positioning seat and a second positioning seat are erected on the inner side of the test cabinet, and an oil pump motor is arranged between the first positioning seat and the second positioning seat; an oil outlet and an oil inlet are respectively formed in the top and the bottom of the oil pump motor oil pump end; a hydraulic system is arranged between the test cabinet and the hydraulic oil tank, and a plurality of hydraulic lifting mechanisms are arranged on the hydraulic system; each hydraulic lifting mechanism is provided with a lower clamping seat, an upper clamping seat is arranged above the lower clamping seat, a first transmission assembly is arranged between the lower clamping seat and the upper clamping seat, and an oil pumping testing mechanism is arranged on the outer side of the oil pump motor oil pump end and comprises a second sliding plate. The technical problems that a current oil pump motor testing device is single in testing type, the steps are time-consuming and labor-consuming, and various testing working condition requirements cannot be met are solved.

Description

Technical Field

[0001] This invention relates to the field of oil pump motor testing technology, and more specifically, to an oil pump motor performance testing fixture. Background Technology

[0002] An oil pump motor is an improved type of motor specifically designed to drive an oil pump. The oil pump motor includes a motor body, a front cover, and an output drive shaft. A stepped hole is formed in the front cover, and the output drive shaft, which is retracted into the front cover, is a hollow shaft. The diameter of the shaft hole matches the outer diameter of the input drive shaft of the oil pump. A keyway is located at the end of the output drive shaft. Oil pumps are classified as high-pressure and low-pressure: high-pressure plunger oil pumps rely on a camshaft within the pump to drive the plunger in a plunger sleeve, generating high-pressure oil to supply the injectors. Currently, during the production and preparation of oil pump motors, pressure and flow rate tests are required to assess their pumping performance.

[0003] The current device for testing the pumping performance of oil pump motors involves installing the oil pump motor in a designated fixed position, then connecting the oil inlet and outlet of the oil pump motor to the oil pipeline. By starting the oil pump motor, the pressure and flow rate of the oil in the pipeline are tested using a pressure sensor. However, the existing testing device can only measure one oil pump motor at a time. Furthermore, when installing and testing oil pump motors of different specifications (same type, different sizes), independent and multiple adjustments and fixations are required, which is inconvenient. In addition, the connection of the oil pipeline for testing needs to be manually achieved through a union, which is time-consuming. Summary of the Invention

[0004] In order to overcome the above-mentioned defects of the prior art, the embodiments of the present invention provide an oil pump motor performance testing fixture. The technical problem to be solved by the present invention is that the current oil pump motor testing device has a single testing type and the steps are time-consuming and laborious, which cannot meet the needs of various testing conditions.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a performance testing fixture for an oil pump motor, comprising a test cabinet, wherein a hydraulic oil tank is provided inside the test cabinet, and a positioning seat one and a positioning seat two are mounted on the inner side of the test cabinet, and an oil pump motor is arranged between the positioning seat one and the positioning seat two, wherein an oil outlet and an oil inlet are respectively provided at the top and bottom of the oil pump end of the oil pump motor. A hydraulic system is provided between the test cabinet and the hydraulic oil tank. The hydraulic system is equipped with multiple hydraulic lifting mechanisms. Each hydraulic lifting mechanism is equipped with a lower clamping seat. An upper clamping seat is provided above the lower clamping seat. A transmission assembly is provided between the lower clamping seat and the upper clamping seat. An oil pumping test mechanism is provided on the outside of the oil pump end of the oil pump motor. The oil pumping test mechanism includes a slide plate two, which is fixedly connected to the test cabinet. A pair of lifting plates are slidably connected to the slide plate two, and a test sealing tube is fixedly connected to one end of each lifting plate. A fixed linkage component is installed between the lifting plate and the sliding plate at the bottom, and a transmission component is installed between the pair of lifting plates.

[0006] In a preferred embodiment, the hydraulic system includes a feed pump fixedly connected to the hydraulic oil tank. The output end of the feed pump is fixedly connected to an oil delivery pipe. One end of the oil delivery pipe is fixedly connected to a main delivery pipe. Multiple delivery branch pipes are fixedly connected to the main delivery pipe. A pressure sensor is installed on the oil delivery pipe, and a one-way valve is installed on each delivery branch pipe.

[0007] In a preferred embodiment, the hydraulic lifting mechanism includes a cylinder barrel, which is fixedly connected to the conveying branch pipe. A piston is slidably connected inside the cylinder barrel, and a push rod is fixedly connected to the piston. A return pipe is provided between the cylinder barrel and the hydraulic oil tank, and a pressure relief valve is provided on the return pipe.

[0008] In a preferred embodiment, one end of the top rod is fixedly connected to a support plate one, the lower clamp is fixedly connected to the top of the support plate one, the inner side of the test cabinet is fixedly connected to a slide plate one, the support plate one is slidably connected to the slide plate one, the upper clamp is fixedly connected to a support plate two, the transmission assembly one includes a gear one, the gear one is rotatably connected to the slide plate one via a bracket, the gear one is meshed with a rack one and a rack two respectively, the rack one is fixedly connected to the support plate one, and the rack two is fixedly connected to the support plate two.

[0009] In a preferred embodiment, a guide rod is fixedly connected to one end of the rack 2, a guide plate is fixedly connected to the slide plate 1, the guide rod is inserted into the guide plate, and a return spring is sleeved on the guide rod.

[0010] In a preferred embodiment, a pair of test sealing tubes are respectively inserted into the oil outlet and the oil inlet. Test oil pipes are fixedly connected to the test sealing tubes. Each test oil pipe is connected to the hydraulic oil tank, and each test oil pipe is equipped with a pressure sensor.

[0011] In a preferred embodiment, the fixed linkage assembly includes a rack three, which is slidably connected to the slide plate two. A rack four is slidably connected to the lifting plate. A gear two is meshed between the rack three and the rack four. A shaft is rotatably connected to the gear two, and one end of the shaft is connected to the lower clamp.

[0012] In a preferred embodiment, a counterweight is fixedly connected to the bottom of the rack four.

[0013] In a preferred embodiment, the transmission assembly two includes a gear three, which is rotatably connected to the slide plate two via a bracket. A rack five and a rack six are respectively meshed on the gear three. The rack five is fixedly connected to the lifting plate at the bottom, and the rack six is ​​fixedly connected to the lifting plate at the top.

[0014] The technical effects and advantages of this invention are as follows: This hydraulic pump motor performance testing fixture utilizes a hydraulic system in conjunction with multiple hydraulic lifting mechanisms. The pumping oil diverted by the hydraulic system can adaptively enter multiple hydraulic lifting mechanisms to provide lifting pressure. When fixing hydraulic pump motors of different specifications, after positioning seats one and two at a certain station have clamped the hydraulic pump motor, the pumping oil can automatically move towards the position of the hydraulic pump motor that has not been clamped to provide lifting pressure to the hydraulic lifting mechanism. In this way, multiple and relatively opposite positioning seats one and two can adaptively complete the clamping of multiple sets of hydraulic pump motors of different specifications, improving the testing efficiency of hydraulic pump motors and eliminating the testing and installation process.

[0015] When the lifting pressure is obtained by the first positioning seat, the first transmission component can make the first positioning seat and the second positioning seat move relatively close or far away from each other. In this way, the first positioning seat and the second positioning seat can quickly clamp and release the oil pump motor.

[0016] This oil pump motor performance testing fixture, by setting a test sealing tube with a conical structure, allows the fixed linkage component to obtain the lifting power of the positioning seat one during the relative clamping movement of positioning seat one and positioning seat two, thereby driving one of the test sealing tubes to extend into the oil outlet or oil inlet. The moving gear two drives the corresponding rack three and rack four to lift and rotate, which can compensate for the gap of the test sealing tube extending into the oil outlet, so as to achieve the effect of synchronous testing and sealing of multiple oil pump motors during testing. This can shorten the testing time and reduce the difficulty of self-connection of pipelines. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the oil pump motor, positioning seat one, and positioning seat two of the present invention; Figure 3 This is a schematic diagram of the hydraulic system and hydraulic lifting mechanism of the present invention.

[0018] Figure 4 This is a schematic diagram of the hydraulic lifting mechanism, lower clamp, upper clamp, and transmission assembly of the present invention.

[0019] Figure 5 This is a schematic diagram of the transmission component 1 and the slide plate 1 of the present invention.

[0020] Figure 6 This is a schematic diagram of the test sealing tube, transmission assembly two, and fixed linkage assembly of the present invention; Figure 7 This is a schematic diagram of the fixed linkage component, support plate one, and slide plate two of the present invention.

[0021] The attached diagram is labeled as follows: 1. Test cabinet; 2. Positioning seat one; 3. Positioning seat two; 4. Oil pump motor; 5. Oil outlet; 6. Oil inlet; 7. Feed pump; 8. Oil delivery pipe; 9. Main delivery pipe; 10. Branch delivery pipe; 11. Cylinder barrel; 12. Piston; 13. Push rod; 14. Return pipe; 15. Slide plate one; 16. Support plate one; 17. Lower clamp; 18. Upper clamp; 19. Support plate two; 20. Gear one; 21. Rack one; 22. Rack 23. Slide plate II; 24. Lifting plate; 25. Test sealing pipe; 26. Test oil pipe; 27. Rack III; 28. Rack IV; 29. ​​Gear II; 30. Shaft; 31. Gear III; 32. Rack V; 33. Rack VI; 34. Hydraulic oil tank; 35. Check valve; 36. Pressure relief valve; 37. Pressure sensor I; 38. Pressure sensor II; 39. Guide rod; 40. Guide plate; 41. Return spring; 42. Counterweight. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] See also Figures 1-7 The present invention provides a performance testing fixture for an oil pump motor, including a test cabinet 1, wherein a hydraulic oil tank 34 is provided inside the test cabinet 1.

[0024] The hydraulic oil tank 34 stores hydraulic oil, which can be used for pumping tests of the oil pump motor, and can also provide hydraulic pressure for stationary tests of the oil pump motor.

[0025] In this embodiment: a positioning seat 1 2 and a positioning seat 2 3 are mounted on the inner side of the test cabinet 1. An oil pump motor 4 is arranged between the positioning seat 1 2 and the positioning seat 2 3. An oil outlet 5 and an oil inlet 6 are respectively provided at the top and bottom of the oil pump end of the oil pump motor 4.

[0026] Both positioning seats 2 and 3 are provided with V-shaped grooves. The oil pump motor 4 is cylindrical and can be movably supported in the V-shaped grooves on the positioning seats. This allows for the central support of motors of various sizes. The oil outlet 5 and oil inlet 6 at the oil pump end can be connected to the hydraulic oil pipeline. By starting the oil pump motor 4 and detecting the pressure and flow rate of the hydraulic oil in the oil outlet pipeline, the performance of the oil pump motor can be tested.

[0027] In this embodiment: a hydraulic system is provided between the test cabinet 1 and the hydraulic oil tank 34. The hydraulic system is equipped with multiple hydraulic lifting mechanisms. The hydraulic system includes a feed pump 7, which is fixedly connected to the hydraulic oil tank 34. The output end of the feed pump 7 is fixedly connected to an oil delivery pipe 8. One end of the oil delivery pipe 8 is fixedly connected to a main delivery pipe 9. Multiple delivery branch pipes 10 are fixedly connected to the main delivery pipe 9. The hydraulic lifting mechanism includes a cylinder 11, which is fixedly connected to the delivery branch pipes 10. A piston 12 is slidably connected inside the cylinder 11. A push rod 13 is fixedly connected to the piston 12. A return pipe 14 is provided between the cylinder 11 and the hydraulic oil tank 34. A pressure relief valve 36 is provided on the return pipe 14.

[0028] Start the feed pump 7, which can draw hydraulic oil from the hydraulic oil tank 34. The hydraulic oil can enter multiple delivery branch pipes 10 through the oil delivery pipe 8 and the delivery main pipe 9 in sequence. Then, the hydraulic oil can be diverted through the delivery branch pipes 10 into multiple cylinders 11. The hydraulic oil can start the piston 12. The piston 12 can drive the push rod 13 to provide lifting power. The pressure relief valve 36 has a pressure relief function, which can make the hydraulic oil in the cylinders 11 flow back to the hydraulic oil tank 34 through the return pipe 14.

[0029] In this application, a cylinder cover is fixedly connected to the top of the cylinder 11. An opening is provided in the center of the cylinder cover. The size of the opening is smaller than that of the piston 12. The push rod 13 passes through the opening. The cylinder cover can restrict the piston 12 from being pushed out.

[0030] In this embodiment: a pressure sensor 38 is installed on the oil delivery pipe 8, and a one-way valve 35 is installed on each delivery branch pipe 10.

[0031] The pressure sensor 2 38 is model XCL-072. The pressure sensor described below is the same model. Pressure sensor 2 38 can detect the pressure and flow rate of hydraulic oil in oil delivery pipe 8. Check valve 35 can make the hydraulic oil in oil delivery pipe 8 have unidirectional flow.

[0032] In this embodiment: each hydraulic lifting mechanism is provided with a lower clamping seat 17, and an upper clamping seat 18 is provided above the lower clamping seat 17. One end of the top rod 13 is fixedly connected to a support plate 16, the lower clamping seat 17 is fixedly connected to the top of the support plate 16, and a sliding plate 15 is fixedly connected to the inner side of the test cabinet 1. The support plate 16 is slidably connected to the sliding plate 15.

[0033] When the push rod 13 provides an upward lifting force, the support plate 16 is slidably connected to the slide plate 15. The support plate 16 can drive the lower clamp 17 to move upward until the lower clamp 17 abuts against the motor surface of the oil pump motor. When multiple sets of oil pump motors with different diameters are fixed, and one of the lower clamps 17 abuts against the oil pump motor, the hydraulic oil stops entering the cylinder 11 corresponding to the lower clamp 17. Since multiple cylinders 11 are connected through the main delivery pipe 9 and the branch delivery pipe 10, the hydraulic oil can automatically compensate to other cylinders 11. In this way, multiple push rods 13 can obtain different lifting heights so that the lower clamp 17 can effectively abut against the motor of the oil pump motor.

[0034] In this embodiment: an upper clamping seat 18 is provided above the lower clamping seat 17, and a second support plate 19 is fixedly connected to the upper clamping seat 18. A transmission assembly is provided between the lower clamping seat 17 and the upper clamping seat 18. The transmission assembly includes a gear 20, which is rotatably connected to the slide plate 15 via a bracket. A rack 21 and a rack 22 are respectively meshed on the gear 20. The rack 21 is fixedly connected to the support plate 16, and the rack 22 is fixedly connected to the support plate 19.

[0035] Because the lower clamp 17 can clamp the surface of the oil pump motor, the rise of the lower clamp 17 can drive the rack 21 to rise through the support plate 16. The rack 21 can drive the gear 20 to rotate clockwise. The gear 20 drives the rack 22 to move in the opposite direction of the rack 21. In this way, the support plate 29 can drive the upper clamp 18 to fall. The movement of the upper clamp 17 and the lower clamp 18 towards each other can clamp and fix the oil pump motor. Because the hydraulic oil can be automatically compensated to other cylinders 11 after the oil inlet of the cylinder 11 is limited, multiple push rods 13 can obtain different lifting heights. This allows the clamping mechanism of multiple upper clamps 17 and lower clamps 18 to fix oil pump motors of various diameters simultaneously, with high fixing efficiency.

[0036] In this embodiment: one end of rack 22 is fixedly connected to guide rod 39, slide plate 15 is fixedly connected to guide plate 40, guide rod 39 is inserted into guide plate 40, and return spring 41 is sleeved on guide rod 39.

[0037] When rack 22 descends, guide rod 39 can slide onto guide plate 40 to guide the movement of support plate 2 19. At the same time, return spring 41 is compressed, and hydraulic oil in cylinder 11 is discharged through return pipe 14. The rebound of return spring 41 causes rack 22 to move upward, so that upper clamp 18 and lower clamp 17 can open automatically for subsequent testing and installation of oil pump motor.

[0038] In this embodiment: an oil pumping test mechanism is provided on the outside of the oil pump end of the oil pump motor 4. The oil pumping test mechanism includes a slide plate 23, which is fixedly connected to the test cabinet 1. A pair of lifting plates 24 are slidably connected to the slide plate 23. A test sealing tube 25 is fixedly connected to one end of each lifting plate 24. A test oil pipe 26 is fixedly connected to the test sealing tube 25. The pair of test sealing tubes 25 are respectively inserted into the oil outlet 5 and the oil inlet 6.

[0039] The test sealing tube 25 has a tapered structure and can be composed of a tapered tube and a tapered sealing rubber sleeve fixed on the surface of the tapered tube. In this way, the test sealing tube 25 can be inserted into the corresponding oil port to adapt to the test seal of oil ports with multiple diameter specifications.

[0040] When in use, when the oil pump motor is placed on positioning seat 1 2 and positioning seat 2 3, in order to make the test sealing tube 25 correspond to the axis of the oil outlet 5 or oil inlet 6, the sliding plate 23 can be moved longitudinally by the lifting plate 24, so that the test sealing tube 25 can be inserted longitudinally into the corresponding oil outlet 5 and oil inlet 6; the existing laser instrument can be installed on the test cabinet 1 in this application. The laser instrument should be horizontally mounted on the test cabinet 1, and the laser instrument provides a laser beam to mark the axis position of the oil outlet 5 or oil inlet 6 laterally, which can facilitate the alignment of the subsequent quick insertion of the test sealing tube 25.

[0041] In this embodiment: a fixed linkage assembly is provided between the lifting plate 24 and the sliding plate 23 at the bottom. The fixed linkage assembly includes a rack 3 27, which is slidably connected to the sliding plate 23. A rack 4 28 is slidably connected to the lifting plate 24. A gear 29 is meshed between the rack 3 27 and the rack 4 28. A shaft 30 is rotatably connected to the gear 29. One end of the shaft 30 is connected to the lower clamp 17.

[0042] In this application, slide rails are fixedly connected to both slide plate 23 and lifting plate 24, and slide grooves are provided on rack 3 27 and rack 4 28. Rack 3 27 and rack 4 28 can slide on the slide rails through the corresponding slide grooves.

[0043] When the support plate 16 rises, the shaft 30 can drive the gear 31 to move upward. The upward movement of the gear 31 can simultaneously push the rack 3 27 and rack 4 28 upward. The rack 3 27 can drive the test sealing tube 25 on it to be inserted into the oil inlet 6 through the lifting plate 24 located at the bottom. After it is fully inserted, the rack 3 27 stops moving. Then the gear 29 can rotate counterclockwise along the tooth groove on the rack 3 27. The counterclockwise rotating gear 29 can continue to push the rack 4 28 to move upward.

[0044] When the oil pump motor is clamped by the lower clamp 17, the base height of the test sealing tube 25 located at the bottom will contact the oil pump end of the oil pump motor before the lower clamp 17. Therefore, when the test sealing tube 25 is inserted into oil pump motors of different specifications, the oil pump motor is connected to the pipeline first and then fixed. In this way, when the oil pump ends of multiple oil pump motors are of different sizes and cause different sealing strokes to the test sealing tube 25, the rack three 27 stops moving and the rack four 28 continues to rise to avoid the fixed stroke of the oil pump motor, so that the test sealing tube 25 at different positions can meet the test requirements of different oil port sealing distances.

[0045] In this embodiment, a counterweight block 42 is fixedly connected to the bottom of rack 4 28.

[0046] The counterweight block 42 is required to compensate for the difference in the weight borne by rack 4 28 and rack 3 27. By achieving consistency in the weight borne by rack 4 28 and rack 3 27, rack 4 28 and rack 3 27 will not move in opposite directions during the initial stage of gear 2 29's ascent.

[0047] In this embodiment: a pair of test oil pipes 26 are both connected to the hydraulic oil tank 34, and a pressure sensor 37 is installed on each test oil pipe 26.

[0048] After connecting the oil outlet 5 and oil inlet 6 at the oil pump end of the oil pump motor to the corresponding test sealing pipes 25, the oil pump motor can be started. The hydraulic oil in the hydraulic oil tank 34 can circulate through the test oil pipe 26, the test sealing pipe 25 and the oil pump end of the oil pump motor. A pressure gauge can be set on the pressure sensor 37, and the pressure and flow rate of the flowing hydraulic oil can be detected by the pressure sensor 37.

[0049] In this embodiment: a transmission assembly 2 is provided between a pair of lifting plates 24. The transmission assembly 2 includes a gear 31. The gear 31 is rotatably connected to the slide plate 23 via a bracket. A rack 5 32 and a rack 6 33 are respectively meshed on the gear 31. The rack 5 32 is fixedly connected to the lifting plate 24 located at the bottom, and the rack 6 33 is fixedly connected to the lifting plate 24 located at the top.

[0050] During the process of sealing the oil inlet 6 with the test sealing tube 25 located at the bottom, the lifting plate 24 located below can drive the rack 32 to rise. The rise of the rack 32 can drive the gear 31 to rotate clockwise. The rotation of the gear 31 can push the rack 33 to move downward. In this way, the test sealing tube 25 located at the top can move relative to the test sealing tube 25 located at the bottom, so that the test sealing tube 25 located at the top can be inserted into the oil outlet 5 at the end of the oil cylinder. In this way, the oil pump motor 4 can perform hydraulic oil pumping test.

[0051] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A performance testing fixture for an oil pump motor, comprising a testing cabinet (1), characterized in that: The test cabinet (1) is equipped with a hydraulic oil tank (34). The test cabinet (1) is equipped with a positioning seat one (2) and a positioning seat two (3) on its inner side. An oil pump motor (4) is arranged between the positioning seat one (2) and the positioning seat two (3). The top and bottom of the oil pump end of the oil pump motor (4) are respectively equipped with an oil outlet (5) and an oil inlet (6). A hydraulic system is provided between the test cabinet (1) and the hydraulic oil tank (34). Multiple hydraulic lifting mechanisms are provided on the hydraulic system. Each hydraulic lifting mechanism is provided with a lower clamp (17). An upper clamp (18) is provided above the lower clamp (17). A transmission assembly is provided between the lower clamp (17) and the upper clamp (18). An oil pumping test mechanism is provided on the outside of the oil pump end of the oil pump motor (4). The oil pumping test mechanism includes a slide plate two (23). The slide plate two (23) is fixedly connected to the test cabinet (1). A pair of lifting plates (24) are slidably connected on the slide plate two (23). A test sealing tube (25) is fixedly connected to one end of each lifting plate (24). A fixed linkage assembly is provided between the bottom lifting plate (24) and the slide plate (23), and a transmission assembly is provided between a pair of lifting plates (24).

2. The oil pump motor performance testing fixture according to claim 1, characterized in that: The hydraulic system includes a feed pump (7), which is fixedly connected to the hydraulic oil tank (34). The output end of the feed pump (7) is fixedly connected to an oil delivery pipe (8). One end of the oil delivery pipe (8) is fixedly connected to a main delivery pipe (9). Multiple delivery branch pipes (10) are fixedly connected to the main delivery pipe (9). A pressure sensor (38) is installed on the oil delivery pipe (8). A check valve (35) is installed on each delivery branch pipe (10).

3. The oil pump motor performance testing fixture according to claim 2, characterized in that: The hydraulic lifting mechanism includes a cylinder (11), which is fixedly connected to the conveying branch pipe (10). A piston (12) is slidably connected inside the cylinder (11), and a push rod (13) is fixedly connected to the piston (12). A return pipe (14) is provided between the cylinder (11) and the hydraulic oil tank (34), and a pressure relief valve (36) is provided on the return pipe (14).

4. The oil pump motor performance testing fixture according to claim 3, characterized in that: One end of the top rod (13) is fixedly connected to a support plate (16), the lower clamp (17) is fixedly connected to the top of the support plate (16), the inner side of the test cabinet (1) is fixedly connected to a slide plate (15), the support plate (16) is slidably connected to the slide plate (15), the upper clamp (18) is fixedly connected to a support plate (19), the transmission component includes a gear (20), the gear (20) is rotatably connected to the slide plate (15) through a bracket, the gear (20) is meshed with a rack (21) and a rack (22), the rack (21) is fixedly connected to the support plate (16), and the rack (22) is fixedly connected to the support plate (19).

5. The performance testing fixture for an oil pump motor according to claim 4, characterized in that: One end of the rack 2 (22) is fixedly connected to a guide rod (39), and a guide plate (40) is fixedly connected to the slide plate 1 (15). The guide rod (39) is inserted into the guide plate (40), and a return spring (41) is sleeved on the guide rod (39).

6. The performance testing fixture for an oil pump motor according to claim 1, characterized in that: A pair of test sealing tubes (25) are respectively inserted into the oil outlet (5) and the oil inlet (6). Test oil pipes (26) are fixedly connected to the test sealing tubes (25). Each test oil pipe (26) is connected to the hydraulic oil tank (34), and each test oil pipe (26) is equipped with a pressure sensor (37).

7. The performance testing fixture for an oil pump motor according to claim 1, characterized in that: The fixed linkage assembly includes rack three (27), rack three (27) is slidably connected to the slide plate two (23), rack four (28) is slidably connected to the lifting plate (24), gear two (29) is meshed between rack three (27) and rack four (28), shaft (30) is rotatably connected to gear two (29), and one end of shaft (30) is connected to the lower clamp (17).

8. The performance testing fixture for an oil pump motor according to claim 7, characterized in that: The bottom of the rack four (28) is fixedly connected to a counterweight (42).

9. The performance testing fixture for an oil pump motor according to claim 1, characterized in that: The transmission assembly two includes a gear three (31), which is rotatably connected to the slide plate two (23) via a bracket. The gear three (31) is respectively meshed with a rack five (32) and a rack six (33). The rack five (32) is fixedly connected to the lifting plate (24) at the bottom, and the rack six (33) is fixedly connected to the lifting plate (24) at the top.

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