CN104458466A - Friction performance testing device for slipper pair of high-pressure axial plunger pump - Google Patents

Abstract

The invention discloses a high-pressure axial plunger pump sliding shoe pair friction performance testing device. The device is respectively provided with a high-pressure oil chamber and an experimental airtight chamber on the left and right sides of the box body. The left and right ends of the box body are respectively equipped with The left end cover of the box body and the right end cover of the box body; a thrust piston is installed in the high-pressure oil chamber, and the end of the piston rod of the thrust piston is set in the experimental airtight chamber. connection; the fixed shaft of the swash plate is installed on the right end cover of the box body, one end of the fixed shaft of the swash plate is set in the closed chamber of the experiment, and the swash plate used for testing is connected to this end by bolts, and the other end of the fixed shaft of the swash plate is connected by a joint. The shaft drive is connected with a variable frequency motor controlled by a frequency converter. The invention can not only test the dry friction performance of the sliding shoe pair of the high-pressure axial plunger pump, but also simulate different working states for testing. The invention has the advantages of simple structure, convenient use, accurate test, low production and use costs and the like.

Description

High-pressure axial piston pump sliding shoe pair friction performance test device

technical field

The invention relates to a high-pressure axial plunger pump sliding shoe pair friction performance testing device, which belongs to the technical field of friction performance testing of the axial plunger pump sliding shoe pair.

Background technique

At present, there are generally 7, 9 or 11 sliding shoe pairs installed in commonly used axial piston pumps, and each sliding shoe pair is composed of a sliding shoe and a swash plate. The detailed structure of each sliding shoe pair is as follows: As shown in Figure 2, in the actual working process, the sliding shoe slides along the surface of the swash plate at high speed, and an inner oil chamber and an auxiliary supporting oil groove are designed on the bottom surface of the sliding shoe. When the axial piston pump is working, there is high pressure in the pump The oil enters the inner oil chamber and the auxiliary support oil tank on the bottom surface of the slide shoe through the oil hole provided on the slide shoe, thereby forming a layer of oil film hydrostatic support between the slide shoe and the swash plate; that is, the actual pump is in the working process , There is a layer of lubricating oil film between the bottom surface of the shoe and the surface of the swash plate. The performance of the whole pump is closely related to the performance of this layer of oil film. If the performance of the oil film is good, the service life of the pump will be long; Over time, it will burn out the slide shoes, which will cause the whole pump to break down. Therefore, in order to improve the performance of the pump, many scholars concentrate their efforts on the oil film between the sliding shoe and the swash plate. Therefore, in the prior art, there are many technical solutions for testing the friction performance of the sliding shoe pair. The performance of the oil film of the shoe pair is tested from the perspective of oil film lubrication, and the entire high-pressure axial piston pump is directly simulated to test the actual working conditions of the oil film lubrication performance during the test. This test method It can reveal the oil film lubrication performance of the shoe pair, but it cannot reveal the dry friction performance of the shoe pair; and there are still problems such as high test cost, complex structure of the test device, troublesome test operation, and low test efficiency. Therefore, the existing test methods for the friction performance of the sliding shoe pair of the high-pressure axial piston pump cannot fully reveal the working performance of the sliding shoe pair, and further supplementary tests are needed.

Contents of the invention

The object of the present invention is to provide a high-pressure axial piston pump with simple structure, convenient use, accurate test, low production and use cost, and not only can perform dry friction performance test, but also simulate different working conditions. A sliding shoe pair friction performance testing device overcomes the deficiencies in the prior art.

Technical scheme of the present invention is realized like this:

A high-pressure axial plunger pump sliding shoe pair friction performance testing device of the present invention is as follows: the device includes a box body, and a high-pressure oil chamber and an experimental airtight chamber are respectively arranged on the left and right sides of the box body. The left end cover of the box body and the right end cover of the box body are respectively installed on the ends of the box body, and the oil inlet connection port and the oil return connection port used to connect with the hydraulic control device are arranged on the left end cover of the box body; a thrust piston is installed in the high pressure oil chamber, and the thrust The end of the piston rod of the piston is set in the experimental airtight chamber, and the end of the piston rod of the thrust piston is connected with the sliding shoe that constitutes the sliding shoe pair used for testing through connecting bolts; the fixed shaft of the swash plate is installed in the box through the large bearing and the small bearing On the right end cover, one end of the fixed shaft of the swash plate is set in the experimental airtight chamber, and the swash plate used for testing the sliding shoe pair is connected to this end by bolts, and the other end of the fixed shaft of the swash plate is connected with the frequency converter through the coupling. Inverter controlled inverter motor connection.

The above-mentioned hydraulic control device includes a hydraulic pump driven by an electric motor. The working pressure oil output by the hydraulic pump enters the high-pressure oil chamber through the oil pipe through the check valve and the oil inlet connection port of the left end cover of the box body. The working pressure oil in the high-pressure oil chamber It flows back to the oil tank through the oil return connection port of the left end cover of the tank and through the electro-hydraulic proportional overflow valve.

An embedded control system for controlling pressure oil pressure is connected to the control end of the above-mentioned electro-hydraulic proportional relief valve, and the pressure of pressure oil in the high-pressure oil chamber is measured in real time by a pressure sensor connected to the oil inlet connection port of the left end cover of the box body, The measured values are transferred to the embedded control system for processing and display.

An accumulator is also connected to the oil inlet connection port of the left end cover of the above-mentioned box body.

An unloading circuit is also connected to the output oil pipe of the above-mentioned hydraulic pump. The unloading circuit is composed of a pilot relief valve and a two-position two-way electromagnetic reversing valve. The output oil pipe of the pump is connected, the control port of the pilot relief valve is connected to a port of the normally open position of the two-position two-way electromagnetic reversing valve, and the oil outlet of the pilot relief valve is connected to the two-position two-way electromagnetic reversing valve. The other port of the normally open position of the valve is connected to the fuel tank through the oil pipe, and the solenoid control end of the two-position two-way electromagnetic reversing valve is connected to the embedded control system through wires.

The working pressure of the above-mentioned pilot relief valve is 20%-30% higher than the pressure of the working pressure oil output by the hydraulic pump.

A pressure gauge is also provided at the output port of the hydraulic pump, and the oil inlet port of the hydraulic pump communicates with the oil tank through a filter.

The connection port of the above-mentioned accumulator is connected with the oil inlet connection port of the left end cover of the box body through a shut-off valve.

The upper part of the casing is provided with an oil inlet plug, and the lower part of the casing is provided with an oil outlet plug.

A thrust sleeve for axial positioning is provided between the above-mentioned large bearing and the small bearing, and the thrust sleeve is sleeved on the fixed shaft of the swash plate; a thrust sealing cover for positioning and sealing is also sleeved on the fixed shaft of the swash plate , and the thrust sealing cover is connected to the right end cover of the box by bolts.

Due to the adoption of the above technical solution, the present invention can not only test the dry friction performance of the sliding shoe pair of the high-pressure axial piston pump, but also simulate different working conditions for testing. The high-pressure axial piston pump sliding shoe pair friction performance test device designed by the inventors of the present invention from the perspective of friction is based on the following considerations: As we all know, the axial piston pump is a high-performance high-pressure pump, and its working The situation is ever-changing, no matter how well the pump's slipper pair is designed, the phenomenon of oil film failure is inevitable. Just because of this, the inventor of the present invention is just researching on the phenomenon after the failure of the oil film, and finds ways to improve the "endurance" of the sliding shoe pair after the oil film fails, that is, to improve the resistance of metal to metal high-speed friction. Because, after all, under normal circumstances, the failure of the oil film is occasional and short-lived. Once the working conditions change, the oil film can repair itself. Failure is not a very serious problem. Therefore, the inventors of the present invention have designed this set of experimental devices for the phenomenon of metal-to-metal sliding shoe pair dry friction, adopting the device of the present invention can directly investigate the friction and wear performance of sliding shoe pair dry friction, of course, the friction and wear performance of the It is determined to use the special and standard friction and wear instruments and equipment in the existing technology for detection, and then use the knowledge of tribology to improve the material and structure of the slipper pair according to the detection results, and try to improve the dryness of the slipper and the swash plate. Friction properties. In order to achieve this purpose, the present invention specially designed this set of experimental equipment to create conditions for the generation of high-pressure axial piston pump slipper pair dry friction.

Compared with the prior art, the present invention has the following advantages:

(1) The present invention changes the structure of the swash plate in the slipper pair of the actual high-pressure axial plunger pump into an upright structure, which greatly simplifies the experimental device, and at the same time, does not affect the detection of its friction performance.

(2) In the present invention, both the sliding shoe and the swash plate in the sliding shoe pair of the high-pressure axial plunger pump are designed to be detachable, which provides a powerful tool for testing the friction and wear performance of the sliding shoe pair under different working conditions. hardware support;

(3) The pressure and speed of the slipper pair of the high-pressure axial piston pump of the present invention are adjustable and controllable, and can simulate various working conditions of the actual pump;

(4) The present invention can perform a special dry friction performance test on the high-pressure axial piston pump slipper pair.

In addition, the invention also has the advantages of simple structure, convenient use, accurate test, low production and use costs, and the like.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a structural schematic diagram of a high-pressure axial piston pump slipper pair in the prior art.

The marks in the figure are: 1-filter, 2-hydraulic pump, 3-electric motor, 4-pilot relief valve, 5-two-position two-way electromagnetic reversing valve, 6-pressure gauge, 7-one-way valve, 8-accumulator, 9-stop valve, 10-pressure sensor, 11-embedded control system, 12-electro-hydraulic proportional overflow valve, 13-left end cover of the box, 14-box, 15-oil inlet plug , 16-thrust piston, 17-slider shoe, 18-swash plate, 19-right end cover of box body, 20-thrust sealing cover, 21-connecting bolt, 22-high pressure oil chamber, 23-oil outlet plugging, 24-experiment Airtight cavity, 25-swash plate fixed shaft, 26-big bearing, 27-thrust sleeve, 28-small bearing, 29-coupling, 30-variable frequency motor, 31-frequency converter.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but not as any limitation to the present invention.

Embodiments of the present invention: a structural schematic diagram of a high-pressure axial piston pump sliding shoe pair friction performance testing device of the present invention is shown in Figure 1. The device includes a box body 14. The high-pressure oil chamber 22 and the experimental airtight chamber 24 are made respectively on the side, and then the left and right end caps 13 and the right end caps 19 of the casing are respectively installed on the left and right ends of the casing 14, and the left end cap 13 of the casing is used to connect with The oil inlet connection port and the oil return connection port connected by the hydraulic control device; the thrust piston 16 is housed in the high pressure oil chamber 22, so that the piston rod end of the thrust piston 16 is arranged in the experimental airtight chamber 24, and the piston rod of the thrust piston 16 The end part is connected with the sliding shoe 17 that constitutes the sliding shoe pair used for testing through the connecting bolt 21; the swash plate fixed shaft 25 is installed on the right end cover 19 of the box body through the large bearing 26 and the small bearing 28, so that the swash plate fixed shaft 25 One end is arranged in the experimental airtight chamber 24, and the swash plate 18 that makes up the sliding shoe pair used for testing can be connected on this end by bolts, and the other end of the swash plate fixed shaft 25 is connected with the frequency converter 31 through the coupling 29. The controlled frequency conversion motor 30 is connected; its hydraulic control device includes a hydraulic pump 2 driven by the motor 3, and the working pressure oil output by the hydraulic pump 2 enters through the oil pipe through the oil inlet connection port of the check valve 7 and the left end cover 13 of the box body. The high-pressure oil chamber 22 makes the working pressure oil in the high-pressure oil chamber 22 flow back to the oil tank through the oil return connection port of the left end cover 13 of the box body and the electro-hydraulic proportional overflow valve 12; The control end of the flow valve 12 is connected with an embedded control system 11 for controlling the pressure of the working pressure oil. The embedded control system 11 is relatively simple and can be directly installed with existing finished products, and the pressure of the pressure oil in the high pressure oil chamber 22 is passed The pressure sensor 10 connected to the oil inlet connection port of the left end cover 13 of the box body performs real-time measurement, and transmits the measured value to the embedded control system 11 for processing and display; in order to reduce the fluctuation of the oil pressure in the high-pressure oil chamber 22, the An accumulator 8 is connected to the oil inlet connection port of the left end cover 13 of the box body; an unloading circuit is also connected to the output oil pipe of the hydraulic pump 2, and the unloading circuit is composed of a pilot relief valve 4 and a two-position two-way The electromagnetic reversing valve 5 is formed, the oil inlet port of the pilot relief valve 4 communicates with the output oil pipe of the hydraulic pump 2 through the oil pipe, the control port of the pilot relief valve 4 is connected with the two-position two-way electromagnetic reversing valve 5 One port of the normally open position is connected, the oil outlet of the pilot relief valve 4 and the other port of the normally open position of the two-position two-way electromagnetic reversing valve 5 are connected to the fuel tank through the oil pipe, and the two-position two-way electromagnetic reversing The electromagnet control end of the valve 5 is connected with the embedded control system 11 through wires; when in use, the working pressure of the pilot relief valve 4 is set to be 20%-30% higher than the pressure of the working pressure oil output by the hydraulic pump 2; The output port of the hydraulic pump 2 is also provided with a pressure gauge 6, and the oil inlet port of the hydraulic pump 2 is connected with the oil tank through the filter 1; The shut-off valve 9 is connected with the oil inlet connection port of the left end cover 13 of the box body, and a The oil inlet is plugged 15, and an oil outlet plug 23 is installed at the bottom of the box body 14; in order to make the working performance more stable, a thrust sleeve 27 for axial positioning can be arranged between the large bearing 26 and the small bearing 28, And the thrust sleeve 27 is sleeved on the fixed shaft 25 of the swash plate; the fixed shaft 25 of the swash plate is also covered with a thrust sealing cover 20 for positioning and sealing, and the thrust sealing cover 20 is connected to the right end cover of the box by bolts Serve on 19.

Claims (10)

1. A high-pressure axial piston pump sliding shoe pair friction performance test device, including a box (14), characterized in that: the left and right sides of the box (14) are respectively equipped with high-pressure oil chambers (22) and experimental The airtight cavity (24) is equipped with the left end cover (13) and the right end cover (19) of the box body (19) respectively at the left and right ends of the box body (14). The oil inlet connection port and the oil return connection port connected to the device; a thrust piston (16) is installed in the high pressure oil chamber (22), and the end of the piston rod of the thrust piston (16) is set in the experimental airtight chamber (24). The end of the piston rod of the piston (16) is connected to the sliding shoe (17) that constitutes the sliding shoe pair for testing through the connecting bolt (21); the fixed shaft of the swash plate (25) passes through the large bearing (26) and the small bearing (28) Installed on the right end cover (19) of the box body, one end of the swash plate fixed shaft (25) is set in the experimental airtight chamber (24), and the test swash plate (18) forming the sliding shoe pair is connected to this end by bolts , the other end of the swash plate fixed shaft (25) is connected with the variable frequency motor (30) controlled by the frequency converter (31) through a coupling (29). 2. The high-pressure axial piston pump sliding shoe pair friction performance test device according to claim 1, characterized in that: the hydraulic control device includes a hydraulic pump (2) driven by an electric motor (3), a hydraulic pump ( 2) The output working pressure oil enters the high-pressure oil chamber (22) through the oil pipe through the check valve (7) and the oil inlet connection port of the left end cover (13) of the box body, and the working pressure oil in the high-pressure oil chamber (22) passes through The oil return connection port of the left end cover (13) of the tank body flows back to the oil tank through the electro-hydraulic proportional overflow valve (12). 3. The high-pressure axial piston pump sliding shoe pair friction performance testing device according to claim 2, characterized in that: the control end of the electro-hydraulic proportional relief valve (12) is connected with an embedded device for controlling the working pressure oil pressure type control system (11), and the pressure of the pressure oil in the high-pressure oil chamber (22) is measured in real time by the pressure sensor (10) connected to the oil inlet connection port of the left end cover (13) of the box body, and the measured value is transmitted to the embedded control system System (11) for processing and display. 4. The high-pressure axial piston pump sliding shoe pair friction performance test device according to claim 3, characterized in that an accumulator (8 ). 5. The high-pressure axial piston pump sliding shoe pair friction performance testing device according to claim 3, characterized in that: an unloading circuit is connected to the output oil pipe of the hydraulic pump (2), and the unloading circuit is controlled by a pilot Type relief valve (4) and two-position two-way electromagnetic reversing valve (5), the oil inlet port of pilot relief valve (4) is connected with the output oil pipe of hydraulic pump (2) The control port of the flow valve (4) is connected to a port of the normally open position of the two-position two-way electromagnetic reversing valve (5), and the oil outlet of the pilot relief valve (4) is connected to the two-position two-way electromagnetic reversing valve. The other port of the normally open position of the valve (5) is connected to the fuel tank through the oil pipe, and the electromagnet control end of the two-position two-way electromagnetic reversing valve (5) is connected to the embedded control system (11) through wires. 6. The high-pressure axial piston pump sliding shoe pair friction performance test device according to claim 5, characterized in that the working pressure of the pilot relief valve (4) is higher than the working pressure oil output by the hydraulic pump (2) The pressure is 20%-30%. 7. The high-pressure axial piston pump sliding shoe pair friction performance testing device according to claim 2, characterized in that: a pressure gauge (6) is also provided at the output port of the hydraulic pump (2), and the hydraulic pump ( 2) The oil inlet end communicates with the oil tank through the filter (1). 8. The high-pressure axial piston pump sliding shoe pair friction performance test device according to claim 4, characterized in that: the connection port of the accumulator (8) passes through the stop valve (9) and the left end cover of the box (13 ) to the oil inlet connection. 9. The high-pressure axial piston pump sliding shoe pair friction performance testing device according to claim 1, characterized in that: an oil inlet plug (15) is provided on the upper part of the box body (14), and an oil inlet plug (15) is installed on the box body (14 ) is provided with an oil outlet plug (23) at the bottom. 10. The high-pressure axial piston pump sliding shoe pair friction performance test device according to claim 1, characterized in that: a thrust sleeve for axial positioning is provided between the large bearing (26) and the small bearing (28) cylinder (27), and the thrust sleeve (27) is sleeved on the swash plate fixed shaft (25); the thrust sealing cover (20) for positioning and sealing is also set on the swash plate fixed shaft (25), and the thrust The sealing cover (20) is connected to the right end cover (19) of the box body by bolts.