CN110632280A

CN110632280A - 360-degree oil film appearance testing device for plunger pair

Info

Publication number: CN110632280A
Application number: CN201810702645.8A
Authority: CN
Inventors: 王冬云; 陈彦峰; 孙翔
Original assignee: Zhejiang Normal University CJNU
Current assignee: Zhejiang Normal University CJNU
Priority date: 2018-06-22
Filing date: 2018-06-22
Publication date: 2019-12-31

Abstract

The invention discloses a 360-degree oil film shape testing device for a plunger pair, and relates to the field of hydraulic element testing. The device comprises a hydraulic drive motor, a torque meter and an inclined disc shaft assembly; the device also comprises an experiment box body, wherein an opening at the left end of the box body is provided with an inclined disc shaft; the bottom of the box body is provided with a plunger support, and a cylinder body supporting seat is arranged above the plunger support; a sealing cover is arranged at the right end opening of the box body, and a bearing seat is arranged at the left end of the sealing cover; the cylinder body supporting seat and the bearing seat are respectively provided with a bearing for supporting the cylinder body; the cylinder body is provided with a worm wheel, and the cylinder body can be driven to rotate for 360 degrees by driving the worm; the outside of the right side of the box body is provided with an oil supply pipeline. The invention reduces the installation number of cylinder sensors, reduces the cost and realizes the circumferential arbitrary angle measurement of the oil film characteristic of the plunger.

Description

360-degree oil film appearance testing device for plunger pair

Technical Field

The invention relates to a 360-degree oil film shape testing device for a plunger pair, and belongs to the field of hydraulic element testing.

Background

Hydraulic systems are commonly used in the industrial field. The method makes great contribution to automation, intellectualization and performance improvement of equipment in the fields of engineering machinery, equipment manufacturing and the like. The hydraulic pump plays a crucial role as an energy source for the hydraulic system. At present, the axial plunger pump is widely applied to various engineering practices due to the characteristics of high pressure, high volumetric efficiency, easy realization of flow regulation and the like. Therefore, the plunger pair oil film characteristic test experiment under the working state has important significance.

In a traditional plunger pair oil film testing system, a fixed-point acquisition is mostly carried out on oil film characteristic parameters in a fixed-sensor mode. The test system requires the installation of multiple sensors. The design cost is high, the oil film testing range is limited, and the number of the sensors is large, so that the test system is inconvenient to mount and dismount. Therefore, aiming at the defects of the testing system, the plunger pair 360-degree oil film appearance testing device is provided. The oil film characteristic parameters of the plunger pair are obtained through experiments, the correctness of theoretical research results is verified, and support is provided for the optimization design of the plunger pair of the plunger pump.

Disclosure of Invention

In order to overcome the defects of high design cost, limited test range, inconvenience in installation and disassembly and the like of a traditional plunger pair oil film test system, the invention provides a 360-degree plunger pair oil film appearance test device which can enable a cylinder body to rotate around the axis of the cylinder body under the conditions of reducing the installation number of circumferential sensors of the cylinder body of a plunger pump and reducing the cost, so that the circumferential arbitrary angle test of the oil film characteristic of a plunger pair in the cylinder body is realized, and the problem of limited oil film test range is solved.

The technical scheme adopted by the invention for solving the technical problems is as follows: a360-degree oil film appearance testing device for a plunger pair comprises a hydraulic drive motor, a torque meter and an inclined disc shaft assembly, wherein the hydraulic drive motor is connected with the torque meter through a hydraulic oil pump; the device also comprises an experiment box body, wherein an opening at the left end of the box body is provided with an inclined disc shaft; the bottom of the box body is provided with a plunger support, and a cylinder body supporting seat is arranged above the plunger support; a sealing cover is arranged at the right end opening of the box body, and a bearing seat is arranged at the left end of the sealing cover; the cylinder body supporting seat and the bearing seat are respectively provided with a bearing for supporting the cylinder body; an oil supply pipeline is arranged outside the right side of the box body;

according to the 360-degree oil film morphology testing device for the plunger pair, the experimental box body is of a two-cavity shell structure, the larger cavity on the right side is an experimental oil cavity, and the smaller cavity on the left side is used for mounting the swash plate shaft assembly; the swash plate and the main shaft form an integrated structure, and the swash plate and the main shaft form a swash plate shaft assembly together with a double-row angular contact ball bearing, a single-row angular contact ball bearing, two large and small bearing sleeves and a bearing end cover and are connected with the box body in a sealing way through bolts; a circular nut mounting groove is formed in one section of the swash plate shaft in a stepped mode, and the circular nut and the stop washer are used for achieving pre-tightening of the single-row angular contact ball bearing; the left end of the swash plate shaft is provided with a key groove and is connected with a torque meter through a coupler; the torque meter is connected with the hydraulic motor through another coupler.

In the 360-degree oil film morphology testing device for the plunger pair, in the experimental oil cavity, the plunger support is mounted at the bottom through a bolt, and the cylinder body support seat is connected with the plunger support through a bolt; the middle part of the cylinder body is provided with a positioning shaft shoulder, and the left side of the shaft shoulder is connected with a cylinder body supporting seat through a first supporting bearing; the surface of the cylinder body is provided with mounting holes for an eddy current displacement sensor, an armored thermocouple and a piezoelectric pressure sensor; a step hole is formed in the cylinder body, the left end part of the cylinder body is provided with a positioning hole for installing a lining, and the right end part of the cylinder body is provided with an oil drainage pipe hole; the left end in the cylinder body is provided with a test lining, and the surface of the lining is provided with positioning holes of an eddy current displacement sensor, an armored thermocouple and a piezoelectric pressure sensor; the cylinder body is provided with three sensors, and the right end of the cylinder body is rotatably connected with the bearing seat through a second support bearing; the left side of the plunger bracket is provided with an auxiliary plunger which is parallel to the upper test plunger; and an oil guide channel is formed in the plunger support and is connected with an oil supply pipeline branch below the box body.

According to the 360-degree oil film appearance testing device for the plunger pair, the right side of the experimental oil cavity is provided with an opening, and the opening is hermetically connected with the box body sealing cover; the center of the left end of the sealing cover is provided with a concave hole, an oil leading pipe sleeve is arranged in the middle of the sealing cover, the oil leading pipe on the left side is fixed on the oil leading pipe sleeve through two semicircular oil leading pipe pressing plates, and the pressing plates and the oil leading pipe sleeve are fixed in the hole of the sealing cover through bolts; the left end of the oil guide pipe penetrates through the through hole of the bearing seat to enter the oil guide pipe hole of the cylinder body and is in clearance fit with the right end of the cylinder body; the right end of the sealing cover is provided with a shunting block through a bolt, the right end of the shunting block is connected with an oil inlet pipe, and the lower part of the shunting block is connected with an oil supply branch pipe to form an oil supply pipeline; and a pressure sensor is arranged at the rear side of the shunting block.

Further optimizing the design scheme, the right side of a shaft shoulder in the middle of a cylinder body of the plunger pair 360-degree oil film appearance testing device is provided with a worm wheel through a thin flat key, and the worm wheel is matched with a worm above the worm wheel; the worm is arranged on the worm support through a pair of bearings, a blank cap and a transparent cap; the worm support is connected with the bottom of the experimental oil cavity through a bolt; a through hole is formed in the rear part of the oil cavity, and a shaft at one end of the worm penetrates through the transparent cover and then extends out of the box body and is connected with the stepping motor through a coupler; the stepping motor is fixed on the motor support through a bolt, and the motor support is fixed on the outer wall of the box body through a bolt.

The invention has the advantages that the swash plate shaft is driven to rotate by the hydraulic motor to drive the plunger to reciprocate, the test plunger and the auxiliary plunger are supplied with pressure oil by the same hydraulic oil source through an oil supply pipeline during testing, the bottom of the slipper and the swash plate form oil hydrostatic support, stress can be balanced, the working condition of a real pump can be simulated, and the cylinder body is fixed by two angular contact ball bearings, so that the cylinder body can be prevented from being driven by the plunger to generate axial motion and can also rotate circumferentially around the axis. The self-locking of the worm gear and the worm and the self-locking of the stepping motor are utilized to prevent the cylinder body from rotating in the circumferential direction in the primary test process; the worm is driven by the stepping motor to drive the worm gear and the cylinder body to rotate 360 degrees around the axis of the worm gear and the cylinder body, so that testing at any angle is performed, oil film characteristics at any angle in a plunger cavity are obtained when the plunger moves, 360-degree oil film characteristics of the surface of the plunger are measured by a small number of sensors, and the problems of high design cost, inconvenience in installation and disassembly and limited oil film testing range of a traditional plunger pair oil film testing system are effectively solved.

Drawings

FIG. 1 is a cross-sectional view of the experimental box of the present invention without a top cover;

FIG. 2 is a top view of the boxless top cover of the test system of the present invention;

FIG. 3 is an isometric view of the cylinder body of the present invention;

figure 4 is an isometric view of a bushing of the present invention.

In the figure, 1, a swash plate shaft, 2, a lip seal ring, 3, a round nut, 4, a stop washer, 5, a bearing end cover, 6, a large bearing sleeve, 7, a single-row angular contact ball bearing, 8, a bearing sleeve seal ring, 9, a small bearing sleeve, 10, a double-row angular contact ball bearing, 11, an experimental oil cavity, 12, a test plunger sliding shoe, 13, a test plunger, 14, a bush, 15, a cylinder body, 16, a cylinder body support seat, 17, a first cylinder body support bearing, 18, a worm wheel, 19, a worm, 20, a first worm support bearing, 21, a stepping motor, 22, a stepping motor coupler, 23, a stepping motor support, 24, a bearing through cover, 25, a sleeve, 26, a second bearing side seal ring, 27, a second bearing outer ring seal ring, 28, a second cylinder body support bearing, 29, a bearing seat, 30, a bearing seat seal ring, 31, a seal cover, 32, an oil guide pressure plate, 33, an, 34. the hydraulic control system comprises an oil guide pipe, 35 parts of a flow dividing block, 36 parts of a pressure sensor, 37 parts of an oil inlet pipe, 38 parts of an oil guide pipe sleeve sealing ring, 39 parts of an oil supply branch pipe, 40 parts of an experimental box body, 41 parts of a bearing blank cap, 42 parts of an oil outlet, 43 parts of a second worm support bearing, 44 parts of an eddy current displacement sensor, 45 parts of an armored thermocouple, 46 parts of a piezoelectric pressure sensor, 47 parts of a worm support, 48 parts of a threaded joint, 49 parts of an auxiliary plunger, 50 parts of a plunger support, 51 parts of an auxiliary plunger sliding shoe, 52 parts of a cavity oil temperature sensor mounting hole, 53 parts of a box body bottom frame, 54 parts of a first coupler, 55 parts of a torque meter, 56 parts of a torque meter mounting seat, 57 parts of a second coupler, 58 parts of a motor mounting seat, 59 parts of a hydraulic motor, 60 parts of an eddy current displacement sensor mounting hole, 61 parts of an armored thermocouple mounting hole, 62 parts, 64. the thermocouple positioning hole is armored, 65 is a piezoelectric pressure sensor positioning hole, and 66 is a pressure sensor oil guiding hole.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, a plunger pair 360-degree oil film appearance testing device, a swash plate shaft 1 is a main input shaft, and a swash plate and the input shaft are of an integrated structure to form the swash plate shaft 1; the swash plate shaft 1 is supported by a single-row angular contact ball bearing 7 and a double-row angular contact ball bearing 10, an inner ring is positioned between the two bearings through a small bearing sleeve 9, two small oil through holes are formed in the upper part and the lower part of the small bearing sleeve 9, the two outer bearing rings are positioned through a step hole in a large bearing sleeve 6, the right end of the inner ring of the double-row angular contact ball bearing 10 is positioned by a shaft shoulder of the swash plate shaft 1, and the left end of the single-row angular contact ball bearing 7 is axially fixed and pre-tightened through a stop washer 4 and a round nut; the large bearing sleeve 6 and the bearing end cover 5 are fixed at the left end of the experiment box body 40 through bolts, the swash plate shaft 1 and the bearing end cover 5 are sealed through a lip-shaped sealing ring 2, and the outer edge of the large bearing sleeve 6 is sealed through a sealing ring 8; the above components constitute a swash plate shaft assembly except for the experimental box body 40;

in the experimental oil cavity 11, a plunger bracket 50 is connected with the bottom of the experimental oil cavity 11 through a bolt, an oil guide channel is formed in the plunger bracket 50, one end of a threaded joint 48 is connected with the oil guide channel through a through hole in the bottom of a box body 40, and the other end of the threaded joint is connected with an oil supply branch pipe 39; the upper part of the plunger bracket 50 is connected with a cylinder body supporting seat 16 through a bolt; a first cylinder body supporting bearing 17 for supporting the cylinder body is arranged at the right side of the cylinder body supporting seat 16; the left end of the cylinder body 15 passes through a first cylinder body supporting bearing 17 and is rotatably connected with a cylinder body supporting seat 16; the inner ring of the first cylinder body supporting bearing 17 is fixed by the shaft shoulder of the cylinder body 15, and the outer ring thereof is fixed by the step hole of the rigid body supporting seat 16; the right end of the cylinder body 15 is rotatably connected with a bearing seat 29 through a second cylinder body supporting bearing 28; the inner ring of a second cylinder body supporting bearing 28 is fixed by the step surface at the right end of the cylinder body 15, the outer ring is fixed by the step hole of a bearing seat 29, and the left side and the outer edge of the second cylinder body supporting bearing are respectively sealed by a second bearing side surface sealing ring 26 and a second bearing outer ring sealing ring 27; the right shaft section of the shaft shoulder of the cylinder body 15 is connected with the worm gear 18 through a thin flat key, and the axial positioning of the worm gear 18 and the positioning of the inner ring of the second cylinder body supporting bearing 28 are realized through a sleeve 25;

the worm wheel 18 is matched with a worm 19 above the worm wheel to form a worm-gear pair; as shown in fig. 2, the worm 19 is mounted on the worm support 47 through a first worm support bearing 20 and a second worm support bearing 43, the inner rings of the two bearings are fixed through the shaft shoulder of the worm 19, the outer ring of the first worm support bearing 20 is fixed through the bearing through cover 24, and the outer ring of the second worm support bearing 43 is fixed through the bearing blank cover 41; the bearing transparent cover 24 and the bearing blank cover 41 are connected with a worm support 47 through bolts; one end of the worm 19 extends out of the experiment box body 40 through a through hole on the experiment box body 40 and is connected with the stepping motor 21 through a stepping motor coupler 22; the stepping motor 21 is fixed on the stepping motor support 23 through four small bolts, and the stepping motor support 23 is connected with the outer wall of the experiment box body 40 through bolts;

as shown in fig. 1, a stepped hole is formed in the cylinder 15 for installing a bushing 14, and the bushing 14 is in clearance fit with the test plunger 13; a plunger cavity is formed in the plunger bracket 50, and an auxiliary plunger 49 is arranged on the left side and is parallel to the testing plunger 13; the right side in the cylinder body 15 is provided with an oil drainage pipe hole which is in clearance fit with the left end of the oil drainage pipe 34; the middle section of the oil guide pipe 34 is hermetically connected with the right side of the bearing seat 29 through a bearing seat sealing ring 30; the right end of the oil guide pipe 34 is pressed on the oil guide pipe sleeve 33 through two semicircular oil guide pipe pressing plates 32, and the two semicircular oil guide pipe pressing plates 32 and the oil guide pipe sleeve 33 are fixed in a left concave hole of the sealing cover 31 through bolts; the oil guide pipe sleeve 33 is hermetically connected with the sealing sleeve 31 through a sealing ring 38; the bearing seat 29 is fixed at the left end of the sealing cover 31 through a bolt; the sealing cover 31 is connected with the outer wall of the right side of the experiment box body 40 through bolts; the right end of the sealing cover 31 is provided with a shunting block 35 through four bolts, and the through hole of the shunting block 35 and the central hole of the sealing cover 31 are coaxial; the lower part of the shunting block 35 is connected with an oil supply branch pipe 39 through a thread;

as shown in fig. 2, the right end of the through hole of the shunting block 35 is connected with an oil inlet pipe 37 of an oil supply pipeline through a thread, and the rear part of the through hole is provided with a pressure sensor 36 for monitoring the pressure of an oil supply line; an oil inlet pipe 37, a flow dividing block 35, a central hole of a sealing cover 31, an oil guide pipe 34, an oil guide pipe sleeve 33, an oil guide pipe pressing plate 32, an oil supply branch pipe 39 and a threaded joint 48 form an oil supply pipeline; the front end of the experimental oil cavity 11 is provided with an oil discharge port 42 through threads; the hydraulic drive motor 59 is fixed on the motor mounting base 58 through bolts, and the motor mounting base 58 is connected with the experiment box body 40 through bolts; an output shaft of the hydraulic motor 59 is connected with the torque meter 55 through a second coupling 57, and the torque meter 55 is connected with the swash plate shaft 1 through a first coupling 54; the torque meter 55 is fixed on the torque meter mounting seat 56, and the torque meter mounting seat 56 is connected with the experiment box body 40 through bolts; the whole experimental box body 40 is fixed on a box body underframe 53 through bolts;

as shown in fig. 1, a cavity oil temperature sensor mounting hole 52 is formed at the rear end of the experimental oil cavity 11;

as shown in fig. 3, three rows of sensor mounting holes are processed in parallel on the left surface of the cylinder 15, namely two eddy current displacement sensor mounting holes 60, three armored thermocouple mounting holes 61 and three piezoelectric pressure sensor mounting holes 62, the same sensor mounting holes are distributed along the axial direction of the cylinder, the center distances are 15mm, and the different sensors are distributed at intervals of 45 degrees in the circumferential direction;

as shown in fig. 4, three rows of sensor positioning holes are processed in parallel on the surface of the bush 14, namely two eddy current displacement sensor positioning holes 63, three armored thermocouple positioning holes 64 and three piezoelectric type pressure sensor positioning holes 65, and a pressure sensor oil guiding hole 66 is processed in the center of each pressure sensor positioning hole 65 and communicated with the inside of the bush 14; the positioning holes of the same type of sensors are distributed along the axial direction of the cylinder body, the center distance is 15mm, and the different types of sensors are distributed at intervals of 45 degrees in the circumferential direction.

The helix angle of the worm 19 is 3.22 degrees, self-locking can be realized, the worm 19 can only drive the worm wheel 18 to rotate, so that the cylinder body 15 is driven to rotate through the thin flat key, and the cylinder body 15 cannot drive the worm 19 to rotate through the worm wheel 18 in reverse; the worm 19 is connected with the stepping motor 21 through the stepping motor coupler 22, and the self-locking of the stepping motor 21 and the self-locking of the worm wheel 18 and the worm 19 can ensure that the cylinder body 15 does not rotate around the axis in one test process, so that the test result is prevented from being influenced.

The thickness of an oil film layer between the bushing 14 and the testing plunger 13 changes rapidly, the pressure of the oil film is high, and the working environment is severe, so that the oil film thickness is measured by adopting an eddy current method; eddy current displacement sensor 44 is mounted flush with the inner wall of liner 14; the testing plunger 13 is cylindrical, and a circle can be determined according to two points and the radius, so that if the cylinder body 15 cannot rotate, at least four displacement sensors are needed to measure the offset of the plunger in two planes in the axial direction, the inclination of the plunger is calculated, and the distribution of the oil film thickness is obtained; in the technical scheme, the rotatable cylinder body 15 is adopted, two eddy current displacement sensors 44 are arranged in one axial direction, and two sets of data measured when the cylinder body 15 is at different angles are synthesized through two times of measurement, so that the effect same as that of the four sensors is obtained; under the condition that the cylinder body cannot rotate, the data of four positions with two fixed circumferential angles can be measured, the cylinder body 15 is rotated through the worm wheel 18 and the worm 19 in the technical scheme, the data are measured for multiple times and synthesized, so that the eddy current displacement sensor 44 can measure the thickness of an oil film at any circumferential angle, the use of mathematical means is reduced, the measuring result of the appearance of the circumferential oil film is more visual, and the measuring result is more in line with the actual situation; the axial direction of the oil film still needs to be calculated through a mathematical means, so that the appearance of the whole oil film is obtained; the number of the eddy current displacement sensors can be increased in the axial direction, and nonlinear data can be measured, so that the obtained oil film thickness data is more accurate.

The oil film temperature is measured by taking an armored thermocouple into consideration, and a non-contact measurement method is adopted, so that the armored thermocouple positioning hole 64 on the lining 14 is not punched through; during testing, the inner surface of the lining 14 is directly contacted with an oil film, when the temperature of the oil film reaches a balance, the temperature distribution of the oil film layer is the same as that of the inner wall of the lining 14, and the temperature distribution of the oil film layer can be reversely pushed according to the temperature of a measuring point measured in the lining 14, the thermophysical characteristics of the material and the temperature transfer mode because the temperature transfer in the metal part only needs to consider heat conduction and is relatively easy to analyze.

Since the oil film pressure between the test plunger 13 and the bushing 14 is changed at all times, and when the rotation speed of the swash plate shaft 1 is high, the pressure change frequency is also high, a piezoelectric pressure sensor is selected for measurement; according to the pressure measuring principle of the sensor, the required data can be measured only when the oil pressure of the oil film is applied to the pressure sensor, so that a pressure sensor oil introduction hole 66 is formed at each pressure measuring point, i.e., the center of the piezoelectric pressure sensor positioning hole 65 of the bush 14, so that the pressure oil can be applied to the sensor.

During testing, the stepping motor 21 is self-locked, and the self-locking of the worm wheel 18 and the worm 19 and the fixation of the first cylinder body supporting bearing 17 and the second cylinder body supporting bearing 28 are added, so that the cylinder body 15 cannot move in the circumferential direction and the axial direction; an external oil supply pipeline supplies pressure oil to the plunger cavities of the test plunger 13 and the auxiliary plunger 49, presses the test plunger piston shoes 12 and the auxiliary plunger piston shoes 51 on the inclined disc surface, and forms static pressure support; the hydraulic motor 59 drives the swash plate shaft 1 to rotate, the rotation of the swash plate surface enables the test plunger 13 and the auxiliary plunger 49 to reciprocate, oil absorption and oil discharge of a real pump are simulated, and after balance is achieved, data such as temperature, pressure, displacement and the like are recorded; stopping the hydraulic motor 59, starting the stepping motor 21 after the whole system stops running, enabling the cylinder body 15 to rotate for a certain angle, stopping the stepping motor 21 and performing self-locking, starting the hydraulic motor 59 again, and performing the test again; and repeating the above steps, recording the oil film characteristics of the plurality of groups of cylinder bodies 15 at different angles, and synthesizing to finally obtain the oil film characteristics of the whole plunger cavity.

Claims

1. A plunger pair 360-degree oil film morphology testing device comprises a hydraulic drive motor (59), a torque meter (55) and an inclined disc shaft assembly; the device also comprises an experiment box body (40), wherein the left end opening of the box body (40) is provided with an inclined disc shaft (1); a plunger bracket (50) is arranged at the bottom of the box body (40), and a cylinder body supporting seat (16) is arranged above the plunger bracket; a sealing cover (31) is arranged at the right end opening of the box body (40), and a bearing seat (29) is arranged at the left end of the sealing cover (31); the cylinder body supporting seat (16) and the bearing seat (29) are respectively provided with a bearing for supporting the cylinder body (15); an oil supply pipeline is arranged outside the right side of the box body (40);

the experimental box body (40) is of a two-cavity shell structure, the larger cavity on the right side is an experimental oil cavity (11), and the smaller cavity on the left side is used for mounting a swash plate shaft assembly; the swash plate and the main shaft form an integrated structure, and the swash plate and the main shaft form a swash plate shaft assembly together with a double-row angular contact ball bearing (10), a single-row angular contact ball bearing (7), a large bearing sleeve (6), a small bearing sleeve (9) and a bearing end cover (5), and the swash plate shaft assembly is hermetically connected with an experiment box body (40) through bolts; a section of the swash plate shaft (1) is provided with a round nut mounting groove, and the round nut (3) and the stop washer (4) are utilized to realize the pre-tightening of the single-row angular contact ball bearing (7); the left end of the swash plate shaft is provided with a key slot which is connected with a torque meter (55) through a coupling (54); the torque meter (55) is connected with a hydraulic motor (59) through a coupling (57);

in the experimental oil cavity (11), a plunger support (50) is mounted at the bottom through a bolt, and a cylinder body support seat (16) is connected with the plunger support (50) through a bolt; a positioning shaft shoulder is arranged in the middle of the cylinder body (15), and the left side of the shaft shoulder is connected with a cylinder body supporting seat (16) through a supporting bearing A (17); mounting holes of an eddy current displacement sensor (44), an armored thermocouple (45) and a piezoelectric pressure sensor (46) are machined on the surface of the cylinder body (15); a step hole is formed in the cylinder body (15), the left end part of the cylinder body is provided with a positioning hole for installing the lining (14), and the right end part of the cylinder body is provided with an oil guide pipe hole; a test lining (14) is arranged at the left end inside the cylinder body (15), and an eddy current displacement sensor positioning hole (63), an armored thermocouple positioning hole (64) and a piezoelectric pressure sensor positioning hole (65) are machined in the surface of the lining (14); three sensors are mounted on the cylinder body (15), the right end of the cylinder body (15) is rotatably connected with a bearing seat (29) through a second supporting bearing (28), and a through hole is formed in the center of the bearing seat (29); an auxiliary plunger (49) is arranged on the left side of the plunger bracket (50) and is parallel to the upper testing plunger (13); an oil guide channel is formed in the plunger support (50) and is connected with an oil supply pipeline branch (39) below the box body (40).

An opening is formed in the right side of the experimental oil cavity (11), and the opening is connected with a box body sealing cover (31) in a sealing mode; the left end of the sealing cover (31) is hollow, an oil leading pipe sleeve (33) is arranged in the middle of the sealing cover, a left oil leading pipe (34) is fixed on the oil leading pipe sleeve (33) through two semicircular oil leading pipe pressing plates (32), and the pressing plates (32) and the oil leading pipe sleeve (33) are fixed in a hole of the sealing cover (31) through bolts; the left end of the oil guide pipe (34) penetrates through the through hole of the bearing seat (29) to enter the cylinder body (15), and the outer diameter of the left end of the oil guide pipe is in clearance fit with the inner diameter of the right end of the cylinder body (15); the right end of the sealing cover (31) is provided with a shunting block (35) through threads, and the right end of the shunting block (35) is connected with an oil inlet pipe (37) to form an oil supply pipeline; and a pressure sensor (36) is arranged on the rear side of the shunting block (35).

2. The device for testing the oil film appearance of the plunger pair in 360 degrees according to claim 1, wherein: a worm wheel (18) is arranged on the shaft section on the right side of a shaft shoulder in the middle of the cylinder body (15) through a thin flat key, the worm wheel (18) is matched with a worm (19) above, and the worm (19) is driven by a stepping motor (22) and can drive the cylinder body (15) to rotate for 360 degrees.