A high bearing plunger pump friction pair friction and wear testing machine

Abstract

The application discloses a high-bearing-column-piston pump friction pair friction and wear testing machine, wherein the lower sample is installed on a lower sample clamp, the lower end of the lower sample clamp is provided with a lifting mechanism for driving the vertical movement of the lower sample to make the lower sample contact or separate from the upper sample, and the upper end of the upper sample is connected with a rotary driving device for driving the rotation of the upper sample through an upper sample clamp. The loading of the testing machine is matched with a lead screw through an optimized mechanical structure design, the loading precision is high, the accuracy of experimental results is improved, stepless loading can be realized, and the testing machine is suitable for the friction and wear characteristic research of friction pairs under various pressures; the testing machine is provided with an oil collecting mechanism, the oil at any moment during the experiment can be collected, the change of the physicochemical indexes of the oil during the whole experiment can be detected, and the influence of the change of the physicochemical indexes of the oil on the friction and wear of the friction pair can be accurately analyzed.

Description

Technical Field

[0001] This patent application relates to the technical field of testing equipment, and in particular to a high-load-bearing plunger pump friction pair friction and wear testing machine. Background Art

[0002] The plunger pump is a core component in a hydraulic system, and its lifespan and reliability are directly dependent on the three major friction pairs. The increased pressure of the plunger pump offers advantages such as reduced weight and integrated hydraulic systems, making it a future development trend. High pressure increases the forces acting between the friction pairs, leading to increasingly severe friction and wear problems within the pump, which in turn affects the pump's proper operation. Consequently, various friction and wear testing machines have been developed to study the friction and wear characteristics of the piston pump's friction pairs.

[0003] Currently, the high-pressure operating conditions of plunger pumps are generally around 50 MPa. For testing machines using a disc-ring contact friction pair, the required loading force must reach approximately 16,000 N, making the experiment somewhat dangerous and requiring a long loading time. For testing machines using a ball-on-disc contact friction pair, due to the small contact area, even a relatively small loading force (around 100 N) can cause the contact pressure of the friction pair to exceed 1 GPa, which is clearly not suitable for the actual operating conditions of plunger pumps. Furthermore, among existing testing machine loading methods, hydraulic loading lacks high loading accuracy, while lever loading cannot achieve stepless loading and cannot reach a high loading force. Furthermore, due to machining errors and other factors, the upper and lower specimens of many testing machines cannot ensure full contact, resulting in uneven wear marks on the specimen surfaces and uneven wear. This can cause the actual contact pressure to exceed the theoretical value, affecting the accuracy of the experimental results. Furthermore, since most existing friction and wear testing machines lack the function of collecting oil during the experiment, only the oil before and after the experiment can be studied. This is not conducive to exploring the real-time changes in the physical and chemical properties of the oil throughout the friction and wear process of the friction pair of a high-load plunger pump. Finally, with the development of the plunger pump industry, its working pressure under high-pressure conditions will reach about 70MPa, and the existing testing machines are difficult to reach this working pressure. Therefore, it is necessary to develop a high-load plunger pump friction pair friction and wear testing machine to solve the above problems. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of this patent application is to provide a high-load piston pump friction pair friction and wear testing machine to solve the above-mentioned problems of the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A high-load-bearing plunger pump friction pair friction and wear testing machine includes an upper sample, a lower sample matching the upper sample is provided below the upper sample, the lower sample is mounted on a lower sample fixture, the lower end of the lower sample fixture is equipped with a lifting mechanism that drives the lower sample to move vertically so that the lower sample contacts or separates from the upper sample, and the upper end of the upper sample is connected to a rotating drive device through the upper sample fixture to drive the upper sample to rotate.

[0007] Furthermore, the lifting mechanism is installed on the base, the rotation driving device is installed on the support plate, and the lower end of the support plate is connected to the base through a bracket.

[0008] Furthermore, the lifting mechanism includes a lifting platform installed at the lower end of the lower sample fixture, and also includes a lifting drive device for driving the lifting platform to move up and down.

[0009] Furthermore, the lifting drive device includes a vertical plate connected to the base, a U-shaped fixing seat is connected to the side wall of the vertical plate, and two vertical guide rails are symmetrically connected to the side wall of the U-shaped fixing seat away from the vertical plate. A first slider is slidably connected to each vertical guide rail, and a screw rod with two ends rotatably connected to the upper and lower end surfaces of the U-shaped fixing seat is provided between the two vertical guide rails, a nut is threadedly connected to the screw rod, and the lower end of the nut is connected to a nut seat sleeved on the screw rod, and the upper end of the screw rod passes through the top of the U-shaped fixing seat and is installed on the output shaft of the second servo motor, and the side walls of the lifting platform are fixedly connected to the nut seat and the first slider by screws.

[0010] Furthermore, the output shaft of the second servo motor is connected to a reducer via a diaphragm coupling, the output shaft of the reducer is connected to the upper end of the screw via an elastic coupling, and the second servo motor and the reducer are both mounted on a vertical plate.

[0011] Furthermore, the upper sample fixture includes an upper sample pressing head, a chuck and a chuck fixing seat. The lower end of the upper sample pressing head is provided with a mounting groove for inserting the chuck fixing seat. The upper end of the chuck fixing seat is connected to a spring whose upper end is fixed to the top wall of the mounting groove. The lower end of the chuck fixing seat is provided with a threaded groove connected to the chuck thread. The lower end of the chuck is provided with a deformation hole. The side wall of the deformation hole is provided with a rectangular notch extending outward. The upper sample is inserted into the deformation hole, and the chuck is screwed into the threaded groove of the chuck fixing seat. The deformation hole contracts to clamp and tighten the upper sample.

[0012] The top of the upper sample pressing head is also connected to a convex shaft, and a first through hole arranged horizontally is provided on the convex shaft.

[0013] Further, the rotating driving device comprises a first servo motor fixed on the support plate, an output end of the first servo motor penetrating through the support plate to reach a main shaft connected below the support plate, a lower end of the main shaft being provided with a positioning hole matched with the shape of the convex shaft for inserting the convex shaft, a side wall lower end of the main shaft being provided with a through groove in communication with the positioning hole and having a semi-circular structure at the upper part and a rectangular structure at the lower part, the upper part of the through groove being connected with the convex shaft through a cylindrical pin penetrating through a first through hole, and an outer wall of the main shaft being threadedly connected with a locking nut for preventing the cylindrical pin from being thrown out when the main shaft rotates.

[0014] The side wall of the main shaft is laterally provided with a second through hole in communication with the top of the positioning hole, and an eccentric shaft is inserted into the second through hole and can freely rotate to push the upper sample pressing head downward.

[0015] Further, the lower sample clamp is provided with a groove for fixing the lower sample, and a plurality of threaded holes are uniformly distributed around the groove, and screws for limiting the lower sample are inserted into the threaded holes.

[0016] The side wall of the lower sample clamp is symmetrically provided with an oil extraction port and an oil outlet port, the oil extraction port is connected with the oil collecting mechanism, and the oil outlet port is used to discharge the oil in the lower sample clamp after the experiment is completed.

[0017] Further, the oil collecting mechanism comprises a T-shaped column fixed on the base, the lower end surface of the transverse section of the T-shaped column is connected with a third servo motor, the output shaft of the third servo motor penetrates through the top of the T-shaped column to connect the middle part of the disc, the upper end edge of the disc is hingedly connected with a connecting rod, the other end of the connecting rod is hingedly connected to the upper end surface of the second sliding block, the lower end of the second sliding block is slidingly connected with a guide rail fixedly installed on the upper end surface of the T-shaped column, the end of the second sliding block away from the disc is connected to one end of a piston shaft, the other end of the piston shaft is connected with a piston inserted into an oil box, the side wall of the oil box away from the second sliding block is connected with a cylinder extending outward, the outwardly extending end of the cylinder is threadedly connected to the oil extraction port of the lower sample clamp, and the top of the oil box is provided with a recovery hole for extracting the collected oil during the experiment.

[0018] Further, a stepped hole is formed in the lower end of the lower sample clamp, a screw thermocouple for collecting the temperature in the upper and lower sample clamps is threadedly connected in the stepped hole, a torque sensor for measuring the friction torque is connected to the lower end of the lower sample clamp, a force sensor for measuring the loading force is connected to the lower end of the torque sensor through a first bolt, and the force sensor is fixed on the lifting platform through a second bolt.

[0019] A spherical pit is formed in the middle of the lower end of the lower sample clamp, a spherical protrusion matched with the spherical pit is arranged in the middle of the upper end of the torque sensor, positioning columns are arranged on both sides of the spherical protrusion of the torque sensor, and a positioning groove is formed in the lower end of the lower sample clamp for inserting the positioning columns.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The loading of the testing machine of the present invention is coordinated with the lead screw through an optimized mechanical structure design. This loading method has high loading precision, improves the accuracy of the experimental results, and can achieve stepless loading. It is suitable for the study of friction and wear characteristics of friction pairs under various pressures;

[0022] 2. The present invention can achieve adaptive positioning of the upper and lower specimens through the spring above the chuck fixing seat and the spherical protrusion on the top of the torque sensor. During the experiment, the upper specimen can move slightly in the axial direction, and the lower specimen fixture can rotate slightly on the spherical protrusion, so that the lower specimen is always in a horizontal position, ensuring that the plane determined by the three pins of the upper specimen is absolutely parallel to the lower specimen, thereby ensuring that the upper and lower specimens are in full contact and the accuracy of the experimental results.

[0023] 3. The testing machine of the present invention has an oil collection mechanism that can collect oil at any time during the experiment, thereby detecting changes in the physical and chemical indicators of the oil during the entire experiment and accurately analyzing the impact of changes in the physical and chemical indicators of the oil on the friction and wear of the friction pair;

[0024] 4. The friction pair of the testing machine of the present invention adopts pin-disc contact and has an adaptive positioning function. When the loading force provided by the second servo motor driving the lead screw is 6000N, the contact pressure between the friction pairs can stably reach 70MPa, overcoming the problem of unstable contact pressure values ​​between friction pairs in traditional testing machines, meeting the pressure required by the plunger pump under actual high-pressure working conditions, and compared with existing testing machines, the reduction in required loading force shortens the loading time, thereby improving the efficiency and safety of the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0026] Figure 2 For the present invention Figure 1 Schematic diagram of the three-dimensional structure from another perspective;

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the lifting drive device of the present invention;

[0028] Figure 4 This is a schematic diagram of the explosion structure of the sample fixture of the present invention;

[0029] Figure 5 This is a schematic diagram of the three-dimensional structure of the first servo motor of the present invention;

[0030] Figure 6 This is a schematic diagram of the three-dimensional structure of the eccentric shaft of the present invention;

[0031] Figure 7It is an explosion structure schematic diagram of the oil collecting mechanism of the application;

[0032] Figure 8 It is a three-dimensional structure schematic diagram of the lower sample and the lower sample clamp assembly of the application;

[0033] Figure 9 It is an inverted three-dimensional structure schematic diagram of the lower sample clamp of the application;

[0034] Figure 10 It is a three-dimensional structure schematic diagram of the torque sensor of the application.

[0035] Explanation of reference numerals: base 1, support 2, support plate 3, upper sample clamp 4, upper sample pressure head 41, clamp head 42, clamp head fixing seat 43, spring 44, upper sample 5, rotary driving device 6, first servo motor 61, main shaft 62, cylindrical pin 63, locking nut 64, eccentric shaft 65, lower sample 7, lower sample clamp 8, lifting mechanism 9, lifting table 91, lifting driving device 92, vertical plate 921, U-shaped fixing seat 922, vertical guide rail 923, first sliding block 924, lead screw 925, nut 926, nut seat 927, second servo motor 928, diaphragm coupling 929, speed reducer 9210, elastic coupling 9211, oil collecting mechanism 10, T-shaped stand column 101, third servo motor 102, disc 103, connecting rod 104, second sliding block 105, guide rail 106, piston shaft 107, piston 108, oil box 109, cylinder 1010, screw thermocouple 11, torque sensor 12, force sensor 13. DETAILED DESCRIPTION

[0036] The implementation manners of the present patent application are described below through specific specific examples, and other advantages and effects of the present patent application can be easily understood by those skilled in the art from the disclosure of the present specification. The present patent application can also be implemented or applied through other different specific implementation manners, and various modifications or changes can be made to the details in the present specification based on different views and applications without departing from the spirit of the present patent application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0037] Please refer to Figure 1-10 , the present application provides a technical solution:

[0038] A high-bearing-capacity plunger pump friction pair friction and wear testing machine, such as Figure 1 、 Figure 2 and Figure 7As shown, it includes an upper sample 5, which is a pin structure and there are three of them. A matching lower sample 7 is provided below the upper sample 5. The lower sample 7 is a disc structure and is mounted on a lower sample fixture 8. The lower end of the lower sample fixture 8 is equipped with a lifting mechanism 9 for driving the lower sample 7 to move vertically so that the lower sample 7 contacts or separates from the upper sample 5. The upper end of the upper sample 5 is connected to a rotation drive device 6 for driving the upper sample 5 to rotate through the upper sample fixture 4.

[0039] The lifting mechanism 9 is mounted on the base 1, the rotary drive device 6 is mounted on the support plate 3, the lower end of the support plate 3 is connected to the base 1 through the bracket 2, and the lifting mechanism 9 includes a lifting platform 91 mounted on the lower end of the lower sample fixture 8, and also includes a lifting drive device 92 for driving the lifting platform 91 up and down. Figure 3 As shown, the lifting drive device 92 includes a vertical plate 921 connected to the base 1, and a U-shaped fixing seat 922 is connected to the side wall of the vertical plate 921. The side wall of the U-shaped fixing seat 922 is symmetrically connected to two vertical guide rails 923 away from the vertical plate 921. A first slider 924 is slidably connected to each vertical guide rail 923. A screw rod 925 with both ends rotatably connected to the upper and lower end surfaces of the U-shaped fixing seat 922 is provided between the two vertical guide rails 923. A nut 926 is threadedly connected to the screw rod 925, and the lower end of the nut 926 is connected to a screw rod sleeved on the upper surface of the U-shaped fixing seat 922. The nut seat 927 on the screw rod 925, the upper end of the screw rod 925 passes through the top of the U-shaped fixed seat 922 and is installed on the output shaft of the second servo motor 928, and the side wall of the lifting platform 91 is fixedly connected to the nut seat 927 and the first slider 924 by screws; the output shaft of the second servo motor 928 is connected to the reducer 9210 through the diaphragm coupling 929, and the output shaft of the reducer 9210 is connected to the upper end of the screw rod 925 through the elastic coupling 9211. The second servo motor 928 and the reducer 9210 are both installed on the vertical plate 921.

[0040] In addition, if Figure 4 As shown, the upper sample fixture 4 includes an upper sample press head 41, a chuck 42 and a chuck fixing seat 43. The lower end of the upper sample press head 41 is provided with a mounting groove for the chuck fixing seat 43 to be inserted. The upper end of the chuck fixing seat 43 is connected to a spring 44 whose upper end is fixed to the top wall of the mounting groove. The lower end of the chuck fixing seat 43 is provided with a threaded groove threadedly connected to the chuck 42. The lower end of the chuck 42 is provided with a deformation hole. The side wall of the deformation hole is provided with a rectangular notch extending outward. The upper sample 5 is inserted into the deformation hole, and the chuck 42 is screwed into the threaded groove of the chuck fixing seat 43. The deformation hole contracts to clamp and tighten the upper sample 5. The top of the upper sample press head 41 is also connected to a convex shaft, which has a first through hole arranged horizontally.

[0041] Among them, such as Figure 1 and Figure 5As shown, the rotation drive device 6 includes a first servo motor 61 fixed on the support plate 3, and the output end of the first servo motor 61 passes through the support plate 3 to reach the bottom of the support plate 3 and is connected to the main shaft 62. The lower end of the main shaft 62 is provided with a positioning hole that matches the shape of the cam for the cam to be inserted. The lower end of the side wall of the main shaft 62 is provided with a through groove that is connected to the positioning hole and has a semicircular structure at the upper part and a rectangular structure at the lower part. The upper part of the through groove is connected to the cam through the first through hole through a cylindrical pin 63. The outer wall of the main shaft 62 is threadedly connected with a locking nut 64 that prevents the cylindrical pin 63 from being thrown out when the main shaft 62 rotates; the side wall of the main shaft 62 is laterally provided with a second through hole that is connected to the top of the positioning hole at the lower end, and an eccentric shaft 65 that can rotate freely to push the upper sample press head 41 downward is inserted in the second through hole. The structure of the eccentric shaft 65 is as shown in FIG. Figure 6 shown.

[0042] like Figure 1 and Figure 8 As shown, a groove for fixing the lower sample 7 is provided in the lower sample fixture 8. Specifically, the groove is a rectangular structure, and a plurality of threaded holes are evenly distributed around the circumference of the groove. Screws for limiting the lower sample 7 are inserted into the threaded holes. An oil extraction port and an oil outlet are symmetrically provided on the side wall of the lower sample fixture 8. The oil extraction port is connected to the oil collection mechanism 10, and the oil outlet is used to discharge the oil in the lower sample fixture 8 after the experiment.

[0043] like Figure 1 and Figure 7 As shown, the oil collection mechanism 10 includes a T-shaped column 101 fixed on the base 1, and the lower end surface of the transverse section of the T-shaped column 101 is connected to a third servo motor 102. The output shaft of the third servo motor 102 passes through the middle of the top connection disk 103 of the T-shaped column 101. The upper edge of the disk 103 is hinged to a connecting rod 104. The other end of the connecting rod 104 is hinged to the upper end surface of the second slider 105 through a pin. The lower end of the second slider 105 is slidably connected to a fixedly mounted on the T-shaped column. 101 has a guide rail 106 on the upper end surface, and the end of the second slider 105 away from the disc 103 is connected to one end of the piston shaft 107. The other end of the piston shaft 107 is connected to a piston 108 inserted into an oil box 109. The side wall of the oil box 109 away from the second slider 105 is connected to an outwardly extending cylinder 1010. The outwardly extending end of the cylinder 1010 is threadedly connected to the oil extraction port of the lower sample fixture 8. A recovery hole is provided on the top of the oil box 109 for collecting oil during the experiment.

[0044] like Figure 1 、 Figure 9 and Figure 10As shown, the lower end of the lower sample fixture 8 has a stepped hole, into which a screw thermocouple 11 for collecting the temperature within the upper and lower sample fixtures 8 is threaded. A torque sensor 12 for measuring friction torque is connected to the lower end of the lower sample fixture 8. The lower end of the torque sensor 12 is connected to a force sensor 13 for measuring the loading force via a first bolt. The force sensor 13 is secured to the lifting platform 91 via a second bolt. A spherical recess is defined in the middle of the lower end of the lower sample fixture 8. A spherical protrusion mates with the recess in the middle of the upper end of the torque sensor 12. Positioning posts are connected to the torque sensor 12 on either side of the protrusion. The lower end of the lower sample fixture 8 has a positioning slot for the positioning posts. During the experiment, the upper sample 5 can move slightly axially, and the lower sample fixture 8 can rotate slightly on the protrusion, keeping the lower sample 7 in a horizontal position. This ensures that the plane defined by the upper sample 5 is absolutely parallel to the lower sample 7, thereby ensuring full contact between the upper and lower samples and the accuracy of the experimental results.

[0045] Before the experiment begins, press the cylindrical pin of the upper sample 5 into the chuck 42. Then, tighten the chuck 42 onto the threads on the inner wall of the chuck fixing seat 43. Then, insert the upper sample fixture 4 into the positioning hole at the bottom of the main shaft 62 on the first servo motor 61. At this time, the raised portion of the eccentric shaft 65 is directly above, and the upper sample fixture 4 rests on the non-raised portion of the eccentric shaft 65. Then, use the cylindrical pin 63 to pass through the first through hole above the upper sample pressing head 41 and the through groove at the bottom side of the main shaft 62, and use the lock nut 64 to screw from bottom to top onto the threads on the outer wall of the main shaft 62, thereby installing the upper sample fixture 4 on the main shaft 62. Place the lower sample 7 into the square groove of the lower sample fixture 8, and then screw the screws into the threaded holes around the square groove to tighten the lower sample 7. Then, align the two positioning grooves at the bottom of the lower sample fixture 8 with the two positioning columns above the torque sensor 12, and the lower sample fixture 8 can be installed.

[0046] After the upper and lower specimen fixtures are installed, the computer controls the testing machine, causing the lead screw 925 to begin forward rotation, driven by the second servo motor 928, and to move the lifting platform 91 upward until the lower specimen 7 is in full contact with the upper specimen 5. The force sensor 13 then detects the actual loading force between the upper and lower specimens. When the actual loading force is less than the set loading force, the lead screw 925 continues to rotate forward, causing the lifting platform 91 to move upward. When the actual loading force is greater than the set loading force, the lead screw 925 rotates in the opposite direction, causing the lifting platform 91 to move downward.

[0047] When the loading force reaches the set value, the lower sample holder 8 is connected to the oil collection mechanism 10. At this point, the piston shaft 107 should be located at the right end of the cylinder 1010. Oil is then added to the lower sample holder 8. This completes the preparations for the experiment. Next, the computer controls the testing machine, causing the first servo motor 61 to drive the upper sample holder 4 to begin rotating at the set speed, thereby forming a friction pair between the upper and lower samples.

[0048] During the experiment, the torque sensor 12 receives the friction torque between the friction pairs and converts the friction coefficient between the upper and lower samples through a computer. The screw thermocouple 11 receives the temperature between the friction pairs. In addition, at the set time, the oil collection mechanism 10 starts to work, and the disc 103 starts to rotate under the drive of the third servo motor 102, and drives the second slider 105 to move horizontally through the connecting rod 104. The second slider 105 drives the piston shaft 107 to move to the left. After the piston shaft 107 leaves the cylinder 1010, due to the height difference and the piston shaft 107 no longer blocking the cylinder 1010, the oil in the lower sample holder 8 flows into the oil box 109 along the cylinder 1010. After the disc 103 passes the left limit position, the second slider 105 drives the piston shaft 107 to move to the right. After the piston shaft 107 enters the cylinder 1010, the oil in the lower sample holder 8 stops flowing into the oil box 109, and the piston shaft 107 finally returns to the right end of the cylinder 1010. The oil can then be taken out through the recovery hole on the top of the oil box 109. The oil collection process during the experiment repeats the above process.

[0049] When the experiment reaches the pre-set end condition, the first servo motor 61 stops rotating, and the oil in the lower sample fixture 8 is then drained from the oil outlet. The test machine is then controlled by the computer, causing the lifting platform 91 to move downward to its initial position. To remove the upper sample 5, first loosen the locking nut 64, then rotate the eccentric shaft 65 to push out the upper sample fixture 4, then loosen the chuck 42 and eject the upper sample 5 from the chuck 42. To remove the lower sample 7, first remove the lower sample fixture 8 from the torque sensor 12, then loosen the screws securing the lower sample 7 around the perimeter to remove the lower sample 7.

[0050] The aforementioned values ​​of loading force, friction torque, friction coefficient, and temperature are collected in real time by a data acquisition card and transmitted as voltage signals to the test machine control. The test machine control recognizes and processes the voltage signals, presenting a graph showing the changing trends of these values ​​over the test time. The data file is also saved for subsequent analysis. Furthermore, after the experiment, the physical and chemical properties of the oil collected during the experiment are also tested to more comprehensively analyze its impact on the friction and wear process of the friction pair.

[0051] The above embodiments are merely illustrative of the principles and effects of this patent application and are not intended to limit this patent application. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this patent application. Therefore, all equivalent modifications or alterations made by persons of ordinary skill in the art without departing from the spirit and technical concepts disclosed in this patent application shall be covered by the claims of this patent application.

Claims

1. A high-load piston pump friction pair friction and wear testing machine, comprising an upper sample (5), a lower sample (7) matching the upper sample (5) is provided below the upper sample (5), and is characterized in that: The lower sample (7) is mounted on the lower sample fixture (8), and a lifting mechanism (9) is mounted on the lower end of the lower sample fixture (8) for driving the lower sample (7) to move vertically so that the lower sample (7) contacts or separates from the upper sample (5). The upper end of the upper sample (5) is connected to a rotation drive device (6) for driving the upper sample (5) to rotate through the upper sample fixture (4). The lifting mechanism (9) is mounted on the base (1), and the rotation drive device (6) is mounted on the support plate (3). The lower end of the support plate (3) is connected to the base (1) through the bracket (2). The lifting mechanism (9) includes a lifting platform (91) installed at the lower end of the lower sample fixture (8), and also includes a lifting drive device (92) for driving the lifting platform (91) to move up and down; the lower end of the lower sample fixture (8) is provided with a stepped hole, and a screw thermocouple (11) for collecting the temperature in the upper and lower sample fixtures (8) is connected to the stepped hole through a thread; the lower end of the lower sample fixture (8) is connected to a torque sensor (12) for measuring the friction torque, and the lower end of the torque sensor (12) is connected to a force sensor for measuring the loading force through a first bolt. (13), the force sensor (13) is fixed to the lifting platform (91) by a second bolt; a spherical pit is provided in the middle of the lower end of the lower sample fixture (8), a spherical protrusion matching the spherical pit is provided in the middle of the upper end of the torque sensor (12), the torque sensor (12) is connected to positioning columns on both sides of the spherical protrusion, and a positioning groove for inserting the positioning column is provided at the lower end of the lower sample fixture (8); the upper sample fixture (4) includes an upper sample pressure head (41), a chuck (42) and a chuck fixing seat (43), and the upper sample pressure head (41) The lower end of the chuck fixing seat (43) is provided with a mounting groove for inserting the chuck fixing seat (43), the upper end of the chuck fixing seat (43) is connected to a spring (44) whose upper end is fixed to the top wall of the mounting groove, the lower end of the chuck fixing seat (43) is provided with a thread groove threadedly connected to the chuck (42), the lower end of the chuck (42) is provided with a deformation hole, the side wall of the deformation hole is provided with a rectangular notch extending outward, the upper sample (5) is inserted into the deformation hole, the chuck (42) is screwed into the thread groove of the chuck fixing seat (43), and the deformation hole contracts to clamp and tighten the upper sample (5); The top of the upper sample pressing head (41) is also connected to a convex shaft, and a first through hole arranged transversely is provided on the convex shaft; The rotary drive device (6) includes a first servo motor (61) fixed on the support plate (3), an output end of the first servo motor (61) passes through the support plate (3) to reach the bottom of the support plate (3) and is connected to a main shaft (62), a positioning hole matching the shape of the convex shaft for the convex shaft to be inserted is provided at the lower end of the side wall of the main shaft (62), a through groove communicating with the positioning hole and having a semicircular structure at the upper part and a rectangular structure at the lower part is provided at the lower end of the side wall of the main shaft (62), the upper part of the through groove is connected to the convex shaft through the first through hole via a cylindrical pin (63), and a locking nut (64) is threadedly connected to the outer wall of the main shaft (62) to prevent the cylindrical pin (63) from being thrown out when the main shaft (62) rotates; A second through hole is transversely opened on the side wall of the main shaft (62), the lower end of which is connected to the top of the positioning hole, and an eccentric shaft (65) is inserted into the second through hole and can be freely rotated to push the upper sample pressing head (41) downward. The spring (44) in the upper sample fixture (4) and the spherical protrusion on the top of the torque sensor (12) jointly realize the adaptive positioning function of the upper sample (5) and the lower sample (7), so that the upper sample (5) can move slightly in the axial direction and the lower sample fixture (8) can rotate slightly on the spherical protrusion to ensure that the upper sample (5) and the lower sample (7) are in full contact.

2. A high-load piston pump friction pair friction and wear testing machine according to claim 1, characterized in that: The lifting drive device (92) includes a vertical plate (921) connected to the base (1), a U-shaped fixing seat (922) is connected to the side wall of the vertical plate (921), and the side wall of the U-shaped fixing seat (922) away from the vertical plate (921) is symmetrically connected to two vertical guide rails (923), each vertical guide rail (923) is slidably connected to a first slider (924), and a slider is provided between the two vertical guide rails (923) at both ends of which are rotatably connected to the U-shaped fixing seat. The screw rod (925) is connected to the upper and lower end surfaces of the seat (922), and a nut (926) is threadedly connected to the screw rod (925). The lower end of the nut (926) is connected to a nut seat (927) sleeved on the screw rod (925). The upper end of the screw rod (925) passes through the top of the U-shaped fixed seat (922) and is installed on the output shaft of the second servo motor (928). The side wall of the lifting platform (91) is fixedly connected to the nut seat (927) and the first slider (924) by screws.

3. A high-load piston pump friction pair friction and wear testing machine according to claim 2, characterized in that: The output shaft of the second servo motor (928) is connected to the reducer (9210) via a diaphragm coupling (929), and the output shaft of the reducer (9210) is connected to the upper end of the screw rod (925) via an elastic coupling (9211). The second servo motor (928) and the reducer (9210) are both mounted on the vertical plate (921).

4. The high-load piston pump friction pair friction and wear testing machine according to claim 1, characterized in that: The lower sample fixture (8) is provided with a groove for fixing the lower sample (7), and a plurality of threaded holes are evenly distributed around the circumference of the groove, and screws for limiting the position of the lower sample (7) are inserted into the threaded holes; An oil extraction port and an oil outlet are symmetrically provided on the side wall of the lower sample fixture (8). The oil extraction port is connected to the oil collection mechanism (10). The oil outlet is used to discharge the oil in the lower sample fixture (8) after the experiment is completed.

5. The high-load piston pump friction pair friction and wear testing machine according to claim 4, characterized in that: The oil collecting mechanism (10) comprises a T-shaped column (101) fixed on the base (1), the lower end surface of the transverse section of the T-shaped column (101) is connected to a third servo motor (102), the output shaft of the third servo motor (102) passes through the middle of the top connection disc (103) of the T-shaped column (101), the upper end edge of the disc (103) is hinged to a connecting rod (104), the other end of the connecting rod (104) is hinged to the upper end surface of the second slider (105) through a pin, and the lower end of the second slider (105) is slidably connected to a connecting rod (104) fixedly mounted on the T-shaped column ( 101), one end of the second slider (105) away from the disc (103) is connected to one end of the piston shaft (107), the other end of the piston shaft (107) is connected to a piston (108) inserted into the oil box (109), and the side wall of the oil box (109) away from the second slider (105) is connected to a cylinder (1010) extending outward, and the end of the cylinder (1010) extending outward is threadedly connected to the oil extraction port of the lower sample fixture (8), and a recovery hole is opened on the top of the oil box (109) for collecting oil during the extraction experiment.

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