CN114486594A

CN114486594A - High-bearing-capacity friction pair friction wear testing machine for plunger pump

Info

Publication number: CN114486594A
Application number: CN202111678696.XA
Authority: CN
Inventors: 高文娟; 何鸿斌; 侯绿林
Original assignee: Hefei Bolin Advanced Materials Co ltd
Current assignee: Hefei Bolin Advanced Materials Co ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-05-13

Abstract

The invention discloses a friction wear testing machine for a friction pair of a high-bearing plunger pump, wherein a lower sample is arranged on a lower sample clamp, the lower end of the lower sample clamp is provided with a lifting mechanism for driving the lower sample to vertically move so as to enable the lower sample to be in contact with or separated from an upper sample, and the upper end of the upper sample is connected with a rotary driving device for driving the upper sample to rotate through the upper sample clamp. The loading of the testing machine is matched with the lead screw through the optimized mechanical structure design, the loading mode has high loading precision, the accuracy of the experimental result 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 provided by the invention is provided with the oil collecting mechanism, and can collect oil at any time in the experiment process, so that the physicochemical index change condition of the oil in the whole experiment process can be detected, and the influence of the physicochemical index change of the oil on the friction and wear condition of the friction pair can be accurately analyzed.

Description

High-bearing-capacity friction pair friction wear testing machine for plunger pump

Technical Field

The application relates to the technical field of testing equipment, in particular to a friction pair friction wear testing machine for a high-bearing plunger pump.

Background

The plunger pump is a core element in a hydraulic system, and the service life and the reliability of the plunger pump are directly determined by three large friction pairs. The high pressure of the plunger pump has advantages of reducing the weight of the plunger pump, realizing integration of a hydraulic system, and the like, and therefore the high pressure of the plunger pump is a future development trend. The acting force between the friction pairs can be increased under the high-pressure working condition, so that the friction and wear problems of the friction pairs in the pump are increasingly serious, and the normal use of the plunger pump is further influenced. Therefore, various friction and wear testing machines have been developed to study the friction and wear characteristics of the plunger pump friction pair.

At present, the high-pressure working condition of the plunger pump is generally about 50MPa, and for a testing machine adopting disc ring contact in a friction pair contact mode, the required loading force is about 16000N, and the test has certain danger and longer loading time. For a testing machine adopting a ball-disk contact mode as a contact mode of a friction pair, the contact area is too small, and even a small loading force (about 100N) can enable the contact pressure of the friction pair to reach more than 1GPa, which obviously does not accord with the actual working condition of a plunger pump. Secondly, in the loading mode of the existing testing machine, the loading precision of hydraulic loading is not high, lever loading cannot be carried out in a stepless mode, and the loading force cannot reach a large value. And because there are reasons such as machining error, the upper and lower sample of many testing machines can not guarantee the complete contact, and the sample surface grinds the trace inhomogeneous, appears the eccentric wear phenomenon to cause actual contact pressure to be greater than theoretical value, influence the accuracy of experimental result. In addition, most of the existing friction wear testing machines do not have the function of collecting oil in the experimental process, so that only the oil before and after the experiment can be researched at present, which is not favorable for researching the oil real-time physicochemical index change condition in the whole friction wear process of the high-bearing plunger pump friction pair. Finally, with the development of the plunger pump industry, the working pressure under the high-pressure working condition reaches about 70MPa, which is difficult to be reached by the existing testing machine, so that it is necessary to develop a high-bearing plunger pump friction pair friction wear testing machine to solve the above problems.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present patent application aims to provide a friction wear testing machine for a friction pair of a high-load plunger pump, which solves the above-mentioned problems of the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a high load-bearing plunger pump friction pair friction wear testing machine, includes one and goes up the sample, goes up the below of sample and is equipped with the lower sample that matches with it, the sample is installed under on sample anchor clamps down, and the lower extreme of sample anchor clamps is installed the drive and is gone down the elevating system that sample vertical movement made sample and last sample contact or separation down, and the upper end of going up the sample is connected with through last sample anchor clamps and orders about the rotatory rotary driving device of sample.

Furthermore, elevating system installs on the base, and rotary driving device installs in the backup pad, and the lower extreme of backup pad passes through the leg joint on the base.

Furthermore, the lifting mechanism comprises a lifting platform arranged at the lower end of the lower sample clamp and a lifting driving device driving the lifting platform to lift.

Further, the lifting driving device comprises a vertical plate connected to the base, a U-shaped fixing seat is connected to the side wall of the vertical plate, two vertical guide rails are symmetrically connected to one end side wall, away from the vertical plate, of the U-shaped fixing seat, a first sliding block is connected to each vertical guide rail in a sliding mode, a screw rod is arranged between the two vertical guide rails, the two ends of the screw rod are connected to the upper end face and the lower end face of the U-shaped fixing seat in a rotating mode, a nut is connected to the screw rod in a threaded mode, the lower end of the nut is connected with a nut seat sleeved on the screw rod, the top of the upper end of the screw rod, penetrating through the U-shaped fixing seat, is installed on an output shaft of the second servo motor, and the side wall of the lifting platform is fixedly connected with the nut seat and the first sliding block through screws.

Furthermore, an output shaft of the second servo motor is connected with a speed reducer through a diaphragm coupler, an output shaft of the speed reducer is connected with the upper end of the screw rod through an elastic coupler, and the second servo motor and the speed reducer are both installed on the vertical plate.

Furthermore, the upper sample clamp comprises an upper sample pressure head, a chuck and a chuck fixing seat, wherein the lower end of the upper sample pressure head is provided with a mounting groove for the chuck fixing seat to insert into, the upper end of the chuck fixing seat is connected with a spring of which the upper end is fixed on the top wall of the mounting groove, the lower end of the chuck fixing seat is provided with a thread groove in threaded connection with the chuck, 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 outwards, the upper sample is inserted into the deformation hole, the chuck is screwed into the thread groove of the chuck fixing seat, and the deformation hole contracts to clamp and fasten the upper sample;

the top of the upper sample pressure head is also connected with a convex shaft, and the convex shaft is provided with a first through hole which is transversely arranged.

Furthermore, the rotary driving device comprises a first servo motor fixed on the supporting plate, the output end of the first servo motor penetrates through the supporting plate to reach the lower part of the supporting plate and is connected with a main shaft, the lower end of the main shaft is provided with a positioning hole matched with the shape of the convex shaft and used for the convex shaft to be inserted into, the lower end of the side wall of the main shaft is provided with a through groove communicated with the positioning hole, the upper part of the through groove is of a semicircular structure, the lower part of the through groove is of a rectangular structure, the upper part of the through groove penetrates through the first through hole through a cylindrical pin and is connected with the convex shaft, and the outer wall of the main shaft is in threaded connection with a locking nut for preventing the cylindrical pin from being thrown out when the main shaft rotates;

and a second through hole with the lower end communicated with the top of the positioning hole is transversely formed in the side wall of the main shaft, and an eccentric shaft which can freely rotate to push the upper sample pressure head out downwards is inserted into the second through hole.

Furthermore, a groove for fixing the lower sample is formed in the lower sample clamp, a plurality of threaded holes are uniformly distributed in the circumferential direction of the groove, and screws for limiting the lower sample are inserted into the threaded holes;

an oil pumping port and an oil outlet are symmetrically formed in the side wall of the lower sample clamp, the oil pumping port is connected with the oil liquid collecting mechanism, and the oil outlet is used for discharging oil liquid in the lower sample clamp after the experiment is finished.

Further, fluid collection mechanism includes a T shape stand of fixing on the base, the lower terminal surface of the horizontal section of T shape stand is connected with third servo motor, the middle part of disc is connected at the top that T shape stand was passed to third servo motor's output shaft, the upper end edge of disc articulates there is the connecting rod, the other end of connecting rod articulates the up end at the second slider through the round pin axle, the lower extreme sliding connection of second slider has the guide rail of fixed mounting at T shape stand up end, the one end of disc is kept away from to the second slider is connected the one end of piston shaft, the other end of piston shaft is connected with the piston that inserts in the oil box, the one end lateral wall that the second slider was kept away from to the oil box is connected with outside extending's drum, the outside tip threaded connection of drum outside extension is in the oil jack of sample anchor clamps down, the recovery hole that is used for collecting fluid in the extraction experimentation is seted up at the top of oil box.

Furthermore, a stepped hole is formed in the lower end of the lower sample clamp, a screw thermocouple for collecting the temperature in the upper sample clamp and the lower sample clamp is connected in the stepped hole in a threaded manner, a torque sensor for measuring friction torque is connected to the lower end of the lower sample clamp, a force sensor for measuring 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 table through a second bolt;

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 connected to two sides, located on the spherical protrusion, of the torque sensor, and positioning grooves for inserting the positioning columns are formed in the lower end of the lower sample clamp.

Compared with the prior art, the invention has the beneficial effects that:

1. the loading of the testing machine is matched with the lead screw through the optimized mechanical structure design, the loading mode is high in loading precision, the accuracy of an experimental result is improved, stepless loading can be realized, and the testing machine is suitable for researching the friction and wear characteristics of friction pairs under various pressures;

2. according to the invention, the self-adaptive positioning function of the upper sample and the lower sample can be realized through the spring above the chuck fixing seat and the spherical bulge at the top of the torque sensor respectively, the upper sample can slightly move in the axial direction in the experimental process, and the lower sample clamp can slightly rotate on the spherical bulge, so that the lower sample is always in a horizontal position, the plane determined by three pins of the upper sample is ensured to be absolutely parallel to the lower sample, the upper sample is ensured to be completely contacted with the lower sample, and the accuracy of the experimental result is ensured;

3. the testing machine is provided with the oil collecting mechanism, and can collect oil at any time in the experiment process, so that the physicochemical index change condition of the oil in the whole experiment process can be detected, and the influence of the physicochemical index change of the oil on the friction and wear condition of the friction pair can be accurately analyzed;

4. the friction pair of the testing machine is in pin-disk contact and has a self-adaptive positioning function, when the loading force provided by the screw driven by the second servo motor is 6000N, the contact pressure between the friction pair can stably reach 70MPa, the problem of unstable contact pressure value between the friction pair of the traditional testing machine is solved, the pressure required by the plunger pump under the actual high-pressure working condition is met, the required loading force is reduced compared with the existing testing machine, the loading time is shortened, and the efficiency and the safety of the experiment are improved.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic perspective view of FIG. 1 from another perspective according to the present invention;

FIG. 3 is a schematic perspective view of the lift driving device of the present invention;

FIG. 4 is a schematic diagram of an exploded view of an upper sample holder according to the present invention;

FIG. 5 is a schematic perspective view of a first servo motor according to the present invention;

FIG. 6 is a schematic perspective view of an eccentric shaft according to the present invention;

FIG. 7 is a schematic view of an exploded structure of the oil collecting mechanism of the present invention;

FIG. 8 is a schematic view of the assembled structure of the lower sample and the lower sample clamp according to the present invention;

FIG. 9 is a schematic view of an inverted three-dimensional configuration of a lower sample holder of the present invention;

fig. 10 is a schematic perspective view of a torque sensor according to the present invention.

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

Detailed Description

The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. The present application is capable of other and different embodiments and its several details are capable of modifications and various changes in detail without departing from the spirit of the present application. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

Referring to fig. 1-10, the present invention provides a technical solution:

a friction and wear testing machine for a friction pair of a high-bearing plunger pump is shown in figures 1, 2 and 7 and comprises an upper sample 5, the upper sample 5 is of a pin structure and is three in number, a lower sample 7 matched with the upper sample 5 is arranged below the upper sample 5, the lower sample 7 is of a disc structure, the lower sample 7 is mounted on a lower sample clamp 8, a lifting mechanism 9 for driving the lower sample 7 to vertically move to enable the lower sample 7 to be in contact with or separate from the upper sample 5 is mounted at the lower end of the lower sample clamp 8, and the upper end of the upper sample 5 is connected with a rotary driving device 6 for driving the upper sample 5 to rotate through an upper sample clamp 4.

Wherein, the lifting mechanism 9 is installed on the base 1, the rotary driving device 6 is installed on the supporting plate 3, the lower end of the supporting plate 3 is connected on the base 1 through the bracket 2, the lifting mechanism 9 comprises a lifting platform 91 installed at the lower end of the lower sample clamp 8, and further comprises a lifting driving device 92 for driving the lifting platform 91 to lift, as shown in fig. 3, the lifting driving device 92 comprises a vertical plate 921 connected on the base 1, a U-shaped fixing seat 922 is connected on the side wall of the vertical plate 921, two vertical guide rails 923 are symmetrically connected on the side wall of the U-shaped fixing seat 922 far away from the vertical plate 921, a first slider 924 is slidably connected on each vertical guide rail 923, a screw 925 with two ends rotatably connected on the upper and lower end faces of the U-shaped fixing seat 922 is arranged between the two vertical guide rails 923, a nut 926 is connected on the screw 925 by screw thread, the lower end of the nut 926 is connected with a nut seat 927 sleeved on the screw, the upper end of the screw 925 penetrates through the top of the U-shaped fixed seat 922 to be installed on an output shaft of the second servo motor 928, and the side wall of the lifting platform 91 is fixedly connected with the nut seat 927 and the first sliding block 924 through screws; the output shaft of second servo motor 928 is connected with speed reducer 9210 through diaphragm shaft coupling 929, and the output shaft of speed reducer 9210 passes through elastic coupling 9211 to be connected with the upper end of lead screw 925, and second servo motor 928 and speed reducer 9210 all install on vertical board 921.

In addition, as shown in fig. 4, the upper sample fixture 4 includes an upper sample pressure head 41, a collet 42 and a collet holder 43, the lower end of the upper sample pressure head 41 is provided with an installation groove into which the collet holder 43 is inserted, the upper end of the collet holder 43 is connected with a spring 44 whose upper end is fixed on the top wall of the installation groove, the lower end of the collet holder 43 is provided with a thread groove in threaded connection with the collet 42, the lower end of the collet 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 collet 42 is screwed into the thread groove of the collet holder 43, and the deformation hole contracts to clamp and fasten the upper sample 5; the top of the upper sample pressure head 41 is further connected with a protruding shaft, and a first through hole which is transversely distributed is formed in the protruding shaft.

As shown in fig. 1 and 5, the rotation driving 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 and reaches a position below the support plate 3 to be connected with a spindle 62, a lower end of the spindle 62 is provided with a positioning hole matched with the shape of the protruding shaft for the protruding shaft to be inserted into, a through groove communicated with the positioning hole and having a semicircular upper part and a rectangular lower part is formed at a lower end of a side wall of the spindle 62, an upper part of the through groove passes through the first through hole through a cylindrical pin 63 to be connected with the protruding shaft, and a locking nut 64 for preventing the cylindrical pin 63 from being thrown out when the spindle 62 rotates is connected to an outer wall thread of the spindle 62; a second through hole with a lower end communicated with the top of the positioning hole is transversely formed in the side wall of the main shaft 62, an eccentric shaft 65 which can freely rotate to push the upper sample pressure head 41 out downwards is inserted into the second through hole, and the structure of the eccentric shaft 65 is shown in fig. 6.

As shown in fig. 1 and 8, a groove for fixing the lower sample 7 is formed in the lower sample clamp 8, specifically, the groove is of a rectangular structure, a plurality of threaded holes are uniformly distributed in the circumferential direction of the groove, and screws for limiting the lower sample 7 are inserted into the threaded holes; an oil pumping port and an oil outlet are symmetrically formed in the side wall of the lower sample clamp 8, the oil pumping port is connected with the oil liquid collecting mechanism 10, and the oil outlet is used for discharging oil liquid in the lower sample clamp 8 after the experiment is finished.

As shown in fig. 1 and 7, the oil collecting mechanism 10 includes a T-shaped upright 101 fixed on the base 1, a lower end surface of a transverse section of the T-shaped upright 101 is connected with a third servo motor 102, an output shaft of the third servo motor 102 passes through a top portion of the T-shaped upright 101 to be connected with a middle portion of a disc 103, an upper end edge of the disc 103 is hinged with a connecting rod 104, the other end of the connecting rod 104 is hinged with an upper end surface of a second slider 105 through a pin shaft, a lower end of the second slider 105 is slidably connected with a guide rail 106 fixedly installed on the upper end surface of the T-shaped upright 101, one end of the second slider 105 far away from the disc 103 is connected with one end of a piston shaft 107, the other end of the piston shaft 107 is connected with a piston 108 inserted into an oil box 109, a side wall of one end of the oil box 109 far away from the second slider 105 is connected with an outwardly extending cylinder 1010, an outwardly extending end portion of the cylinder 1010 is screwed with an oil pumping port of the lower sample clamp 8, and a recovery hole for collecting oil in an extraction experiment process is opened at the top portion of the oil box 109.

As shown in fig. 1, 9 and 10, a stepped hole is formed at the lower end of the lower sample clamp 8, a screw thermocouple 11 for collecting the temperature in the upper and lower sample clamps 8 is connected to the stepped hole through a thread, a torque sensor 12 for measuring friction torque is connected to the lower end of the lower sample clamp 8, a force sensor 13 for measuring loading force is connected to the lower end of the torque sensor 12 through a first bolt, and the force sensor 13 is fixed on the lifting table 91 through a second bolt; a spherical pit has been seted up in the lower extreme middle part of lower sample anchor clamps 8, and the upper end middle part of torque sensor 12 is equipped with the spherical arch that matches with spherical pit, and torque sensor 12 is located spherical protruding both sides and is connected with the reference column, and the lower extreme of lower sample anchor clamps 8 is seted up and is supplied reference column male constant head tank. In the experimental process, the upper sample 5 can slightly move in the axial direction, and the lower sample clamp 8 can slightly rotate on the spherical bulge, so that the lower sample 7 is always in the horizontal position, the plane determined by the upper sample 5 is absolutely parallel to the lower sample 7, the upper sample and the lower sample are completely contacted, and the accuracy of the experimental result is ensured.

Before the experiment is started, a cylindrical pin of an upper sample 5 is pressed into the chuck 42, the chuck 42 is screwed on a thread on the inner wall of the chuck fixing seat 43, then the upper sample clamp 4 is inserted into a positioning hole at the bottom of the main shaft 62 on the first servo motor 61, the convex part of the eccentric shaft 65 is positioned right above, the upper sample clamp 4 is abutted against the non-convex part of the eccentric shaft 65, and then the cylindrical pin 63 is used for penetrating through a first through hole above the upper sample pressure head 41 and a through groove at the bottom of the side surface of the main shaft 62 and screwing the cylindrical pin on the thread on the outer wall of the main shaft 62 from bottom to top by using a locking nut 64, so that the upper sample clamp 4 is installed on the main shaft 62. Put into sample anchor clamps 8's square groove down with sample 7 down, screw in the screw hole all around with the screw next to sample 7 under the fastening, then with two reference columns above two constant head tanks alignment torque sensor 12 of sample anchor clamps 8 bottom down, sample anchor clamps 8 down just can be installed.

After the upper and lower sample clamps are installed, the screw 925 is driven by the second servo motor 928 to rotate in the forward direction and drive the lifting platform 91 to move upward by the control of the tester on the computer until the lower sample 7 is completely contacted with the upper sample 5. Then, the force sensor 13 receives the actual loading force between the upper and lower samples, and when the actual loading force is smaller than the set loading force, the screw 925 continuously rotates in the forward direction to move the elevating platform 91 upward, and when the actual loading force is larger than the set loading force, the screw 925 rotates in the reverse direction to move the elevating platform 91 downward.

When the loading force reaches a set value, the lower sample clamp 8 is connected with the oil collecting mechanism 10, at this time, the piston shaft 107 should be positioned at the right end of the cylinder 1010, and then oil is added into the lower sample clamp 8. The preparation before the start of the experiment is completed, and then the first servo motor 61 drives the upper sample clamp 4 to start rotating according to the set rotating speed through the control of the tester on the computer, so that a friction pair is formed between the upper sample and the lower sample.

In the experiment process, the torque sensor 12 receives the friction torque between the friction pairs, the friction coefficient between the upper and lower samples is obtained through computer conversion, and the screw thermocouple 11 receives the temperature between the friction pairs. In addition, at a set time, the oil collecting mechanism 10 starts to operate, the disc 103 starts to rotate under the driving 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 leftwards, after the piston shaft 107 leaves the cylinder 1010, due to the height difference, the piston shaft 107 does not block the cylinder 1010 any more, the oil in the lower sample clamp 8 flows into the oil box 109 along the cylinder 1010, after the disc 103 passes through the left limit position, the second slider 105 drives the piston shaft 107 to move rightwards, after the piston shaft 107 enters the cylinder 1010, the oil in the lower sample clamp 8 stops flowing into the oil box 109, the piston shaft 107 finally returns to the right end of the cylinder 1010, then the oil can be taken out through a recovery hole at the top of the oil box 109, and then the oil collecting process in the experiment is repeated.

When the experiment reaches the preset end condition, the first servo motor 61 stops rotating, then the oil in the lower sample clamp 8 is discharged from the oil outlet, and then the lifting platform 91 moves downwards to the initial position under the control of a tester on the computer. To remove the upper sample 5, the lock nut 64 is unscrewed, the eccentric shaft 65 is rotated to push out the upper sample holder 4, the chuck 42 is unscrewed, and the upper sample 5 is ejected from the chuck 42. When the sample 7 is removed, the lower sample holder 8 is first removed from the torque sensor 12, and then the screw whose periphery is fastened to the lower sample 7 is unscrewed to remove the lower sample 7.

The numerical values of the loading force, the friction torque, the friction coefficient and the temperature are acquired in real time by a data acquisition card and transmitted to a testing machine for control by a voltage signal, the testing machine controls the identification and processing of the voltage signal, the change trend of the numerical values along with the experimental time is given in a curve diagram form, and meanwhile, a data file is stored for subsequent analysis. In addition, after the experiment, also need detect the physical and chemical index of the fluid that collects in the experimentation to more comprehensive analysis its influence to the vice friction and wear process of friction.

The above-described embodiments are merely illustrative of the principles and utilities of the present patent application and are not intended to limit the present patent application. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of this patent application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed in the present application shall be covered by the claims of the present application.

Claims

1. The utility model provides a high vice frictional wear testing machine of plunger pump friction that bears, includes one and goes up sample (5), goes up the below of sample (5) and is equipped with lower sample (7) that matches with it, its characterized in that: the lower sample (7) is arranged on a lower sample clamp (8), the lower end of the lower sample clamp (8) is provided with a lifting mechanism (9) which drives the lower sample (7) to vertically move so as to enable the lower sample (7) to be in contact with or separated from the upper sample (5), and the upper end of the upper sample (5) is connected with a rotary driving device (6) which drives the upper sample (5) to rotate through an upper sample clamp (4).

2. The high-bearing plunger pump friction pair friction wear testing machine as claimed in claim 1, characterized in that: the lifting mechanism (9) is installed on the base (1), the rotary driving device (6) is installed on the supporting plate (3), and the lower end of the supporting plate (3) is connected to the base (1) through the support (2).

3. The high-bearing plunger pump friction pair friction wear testing machine as claimed in claim 2, characterized in that: the lifting mechanism (9) comprises a lifting platform (91) arranged at the lower end of the lower sample clamp (8) and a lifting driving device (92) driving the lifting platform (91) to lift.

4. The high-bearing plunger pump friction pair friction wear testing machine as claimed in claim 3, characterized in that: lifting drive device (92) is including connecting vertical board (921) on base (1), be connected with U-shaped fixing base (922) on the lateral wall of vertical board (921), the one end lateral wall symmetric connection that vertical board (921) was kept away from in U-shaped fixing base (922) has two vertical guide rail (923), equal sliding connection has a first slider (924) on every vertical guide rail (923), be equipped with both ends between two vertical guide rail (923) and rotate lead screw (925) of connecting terminal surface about U-shaped fixing base (922), threaded connection has nut (926) on lead screw (925), the lower extreme of nut (926) is connected with nut seat (927) of establishing on lead screw (925), the upper end of lead screw (925) is passed the top of U-shaped fixing base (922) and is installed on the output shaft of second servo motor (928), the lateral wall of elevating platform (91) passes through screw and nut seat (927) and first slider (924) fixed connection.

5. The high-bearing plunger pump friction pair friction wear testing machine as claimed in claim 4, wherein: the output shaft of second servo motor (928) passes through diaphragm shaft coupling (929) and is connected with speed reducer (9210), and the output shaft of speed reducer (9210) passes through elastic coupling (9211) and is connected with the upper end of lead screw (925), and second servo motor (928) and speed reducer (9210) all install on vertical board (921).

6. The high-bearing plunger pump friction pair friction wear testing machine as claimed in claim 1, characterized in that: the upper sample clamp (4) comprises an upper sample pressure head (41), a chuck (42) and a chuck fixing seat (43), wherein the lower end of the upper sample pressure head (41) is provided with a mounting groove for the chuck fixing seat (43) to be inserted into, the upper end of the chuck fixing seat (43) is connected with a spring (44) with the upper end fixed on the top wall of the mounting groove, the lower end of the chuck fixing seat (43) is provided with a thread groove in threaded connection with 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 outwards, 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 shrinks to clamp and fasten the upper sample (5);

the top of the upper sample pressure head (41) is also connected with a convex shaft, and the convex shaft is provided with a first through hole which is transversely distributed.

7. The high-bearing plunger pump friction pair friction wear testing machine as claimed in claim 2, characterized in that: the rotary driving device (6) comprises a first servo motor (61) fixed on the supporting plate (3), the output end of the first servo motor (61) penetrates through the supporting plate (3) to reach the lower part of the supporting plate (3) to be connected with a main shaft (62), the lower end of the main shaft (62) is provided with a positioning hole matched with the shape of the convex shaft and used for inserting the convex shaft, the lower end of the side wall of the main shaft (62) is provided with a through groove communicated with the positioning hole, the upper part of the through groove is of a semicircular structure, the lower part of the through groove is of a rectangular structure, the upper part of the through groove penetrates through a first through hole through a cylindrical pin (63) to be connected with the convex shaft, and the outer wall of the main shaft (62) is in threaded connection with a locking nut (64) for preventing the cylindrical pin (63) from being thrown out when the main shaft (62) rotates;

and a second through hole with the lower end communicated with the top of the positioning hole is transversely formed in the side wall of the main shaft (62), and an eccentric shaft (65) which can freely rotate to push the upper sample pressure head (41) out downwards is inserted into the second through hole.

8. The high-bearing plunger pump friction pair friction wear testing machine as claimed in claim 2, characterized in that: a groove for fixing the lower sample (7) is formed in the lower sample clamp (8), a plurality of threaded holes are uniformly distributed in the circumferential direction of the groove, and screws for limiting the lower sample (7) are inserted into the threaded holes;

an oil pumping port and an oil outlet are symmetrically formed in the side wall of the lower sample clamp (8), the oil pumping port is connected with the oil liquid collecting mechanism (10), and the oil outlet is used for discharging oil liquid in the lower sample clamp (8) after the experiment is finished.

9. The high-bearing plunger pump friction pair friction wear testing machine of claim 8, characterized in that: the oil collecting mechanism (10) comprises a T-shaped upright post (101) fixed on the base (1), the lower end face of the transverse section of the T-shaped upright post (101) is connected with a third servo motor (102), the output shaft of the third servo motor (102) penetrates through the top of the T-shaped upright post (101) to be connected with the middle of a disc (103), the upper end edge of the disc (103) is hinged with a connecting rod (104), the other end of the connecting rod (104) is hinged with the upper end face of a second sliding block (105) through a pin shaft, the lower end of the second sliding block (105) is connected with a guide rail (106) fixedly arranged on the upper end face of the T-shaped upright post (101) in a sliding manner, one end, far away from the disc (103), of the second sliding block (105) is connected with one end of a piston shaft (107), the other end of the piston shaft (107) is connected with a piston (108) inserted into an oil box (109), one end, far away from the second sliding block (105), of the oil box (109) is connected with a cylinder (1010) extending outwards, the end part of the cylinder (1010) extending outwards is in threaded connection with an oil pumping port of the lower sample clamp (8), and a recovery hole used for collecting oil in the extraction experiment process is formed in the top of the oil box (109).

10. The high-bearing plunger pump friction pair friction wear testing machine as claimed in claim 3, characterized in that: the lower end of the lower sample clamp (8) is provided with a stepped hole, a screw thermocouple (11) for collecting the temperature in the upper sample clamp and the lower sample clamp (8) is connected in the stepped hole in a threaded manner, the lower end of the lower sample clamp (8) is connected with a torque sensor (12) for measuring friction torque, the lower end of the torque sensor (12) is connected with a force sensor (13) for measuring loading force through a first bolt, and the force sensor (13) is fixed on the lifting table (91) through a second bolt;

a spherical pit is formed in the middle of the lower end of the lower sample clamp (8), a spherical bulge matched with the spherical pit is formed in the middle of the upper end of the torque sensor (12), positioning columns are connected to two sides, located on the spherical bulge, of the torque sensor (12), and positioning grooves for inserting the positioning columns are formed in the lower end of the lower sample clamp (8).