阅读说明：本技术 一种复合型多传感器柱塞泵滑靴副承载特性模拟测试试验机构 (Compound multi-sensor plunger pump piston shoe pair bearing characteristic simulation test mechanism ) 是由 张斌 赵春晓 洪昊岑 龚国芳 杨华勇 程国赞 贾连辉 许顺海 孙志洪 任中永 王 于 2021-10-09 设计创作，主要内容包括：本发明公开了一种复合型多传感器柱塞泵滑靴副承载特性模拟测试试验机构,涉及液压传动轴向柱塞泵测试技术领域。所述试验机构主要包括实验装置及嵌入式承载特性采集模块两部分。实验装置主要包括压力容腔、传动轴、斜盘、缸体、柱塞、斜盘止推杆和回位弹簧。嵌入式承载特性采集模块包括柱塞、嵌入式压力传感器和嵌入式位移传感器：其中嵌入式压力传感器均布于柱塞与斜盘的接触面表面,呈十字分布；嵌入式位移传感器均布于柱塞与斜盘的接触面表面,与嵌入式压力传感器间隔安装；通过嵌入式压力传感器和嵌入式位移传感器可以实现对柱塞与斜盘间间隙支撑油膜的压力特性和油膜尺度特征进行实时监测,实现对油膜承载特性的工况模拟测试和分析。(The invention discloses a composite type multi-sensor plunger pump sliding shoe pair bearing characteristic simulation test mechanism, and relates to the technical field of hydraulic transmission axial plunger pump tests. The testing mechanism mainly comprises an experimental device and an embedded bearing characteristic acquisition module. The experimental device mainly comprises a pressure cavity, a transmission shaft, a swash plate, a cylinder body, a plunger, a swash plate thrust rod and a return spring. The embedded bearing characteristic acquisition module comprises a plunger, an embedded pressure sensor and an embedded displacement sensor: the embedded pressure sensors are uniformly distributed on the surface of the contact surface of the plunger and the swash plate and are distributed in a cross shape; the embedded displacement sensors are uniformly distributed on the surface of the contact surface of the plunger and the swash plate and are installed at intervals with the embedded pressure sensors; the pressure characteristic and the oil film dimension characteristic of a gap supporting oil film between the plunger and the swash plate can be monitored in real time through the embedded pressure sensor and the embedded displacement sensor, and the working condition simulation test and analysis of the oil film bearing characteristic are realized.)

1. A composite multi-sensor plunger pump piston shoe pair bearing characteristic simulation test mechanism is characterized by comprising an experimental device and an embedded bearing characteristic acquisition module; the experimental device comprises a pressure containing cavity (5), a transmission shaft (1), a swash plate (6), a cylinder body (3), a plunger (7), a swash plate thrust rod (2) and a return spring (4); wherein the tail end of the transmission shaft (1) is connected with the power output device through a coupler, and the ball end is connected with the swash plate (6) through a universal coupling mechanism; one end of the return spring (4) is fixed on the inner wall of the pressure containing cavity (5), and the other end of the return spring is abutted against the swash plate (6); the adjusting end of the swash plate thrust rod (2) penetrates out of the pressure cavity (5), and the other end of the swash plate thrust rod is abutted to the swash plate (6); the angle of the swash plate can be adjusted by adjusting the swash plate thrust rod (2) and the return spring (4) so as to simulate the variable process of the swash plate variable pump; the pressure chamber (5) provides a pressure environment through a pressure maintaining pressure oil source (12) and is used for simulating the oil pressure state in the pump shell of the plunger pump; the cylinder body (3) is fixed in the pressure containing cavity (5), and the plungers (7) are distributed in the cylinder body (3); the pressure between the chambers of the plunger (7) and the cylinder body (3) is switched by the pulsation simulator (10) to simulate the real working condition of the plunger pump;

the embedded bearing characteristic acquisition module comprises embedded pressure sensors (14) and embedded displacement sensors (13), wherein the embedded pressure sensors (14) are uniformly distributed on the surface of a contact surface of the plunger piston and the swash plate and are distributed in a cross shape; the embedded displacement sensors (13) are uniformly distributed on the contact surface of the plunger (7) and the swash plate (6) and are installed at intervals with the embedded pressure sensor (14); the pressure characteristic and the oil film scale characteristic of a gap supporting oil film between the plunger (7) and the swash plate (6) can be monitored in real time through the embedded pressure sensor (14) and the embedded displacement sensor (13), and the working condition simulation test and analysis of the oil film bearing characteristic are realized.

2. The composite type multi-sensor plunger pump sliding shoe pair bearing characteristic simulation test mechanism according to claim 1, characterized in that the return spring (4) is a thrust spring, and the return spring (4) is arranged in parallel with the transmission shaft (1).

3. The composite type multi-sensor plunger pump slipper pair bearing characteristic simulation test mechanism of claim 1, wherein the swash plate thrust rod (2) and the transmission shaft (1) are arranged in parallel, and the horizontal position of the swash plate thrust rod can be adjusted through an adjusting end outside the pressure cavity.

4. The composite type multi-sensor plunger pump slipper pair bearing characteristic simulation test mechanism of claim 1, wherein a set of pressure pulse simulator is configured at an inlet of each plunger, the pressure pulse simulator is composed of an electro-proportional valve (8) and a pulsation simulator (10), wherein a pulsation signal sent by the pulsation simulator (10) acts on an electromagnet (9) used for driving a valve core in the electro-proportional valve (8), and the control of oil pressure in the plunger is realized through the control of the valve core of the electro-proportional valve (8); the pressure pulse simulation device is used for simulating the high-low pressure switching working condition of an actual axial plunger pump plunger cavity, and the pressure of an oil source (11) of an oil inlet connected with the electro-proportional valve (8) is the same as the actual load working condition of the axial plunger pump.

5. The composite type multi-sensor plunger pump sliding shoe pair bearing characteristic simulation test mechanism according to claim 1, characterized in that the pressure containing cavity (5) is a pressure-resistant containing cavity, and the pressure of the containing cavity is controlled by a pressure-maintaining pressure oil source (12).

6. The composite type multi-sensor plunger pump sliding shoe pair bearing characteristic simulation test mechanism according to claim 4, characterized in that the pulsation simulator (10) controls the opening and closing of the electro-proportional valve (8) by loading a control waveform conforming to a pressure pulsation rule, so as to realize simulation of high-low pressure switching states of the inlet and the outlet of the plunger pump.

7. The composite type multi-sensor plunger pump slipper pair bearing characteristic simulation test mechanism of claim 1, wherein the embedded pressure sensor (14) and the embedded displacement sensor (13) are wireless communication sensors or wired communication sensors.

Technical Field

The invention relates to the technical field of hydraulic transmission axial plunger pump testing, in particular to a composite type multi-sensor plunger pump sliding shoe pair bearing characteristic simulation test mechanism.

Background

The axial plunger pump is a power source in a hydraulic system, is one of core power elements in the hydraulic field, and has the working principle that the volume of a sealed working cavity is changed through the reciprocating motion of a plunger in a cylinder body, so that the oil suction and discharge processes are realized. The valve has the advantages of small volume, convenient flow control, long service life and the like, so the valve is widely applied to the fields of machining, transportation, aerospace and the like. The sliding shoe pair oil film of the axial plunger pump is a key structure influencing the service life of the axial plunger pump, the sliding shoe pair structure has gap oil film support, and the quality of the bearing characteristic directly determines the reliability of the sliding shoe structure of the plunger pump, so that the method has important research significance for measuring the bearing characteristic of the sliding shoe pair structure of the plunger pump.

At present, the research aiming at the piston pump sliding shoe pair mainly takes simulation analysis as a main part, and the experimental research mainly takes plane pair leakage as an application scene, researches and analyzes the mechanism of the plane pair leakage, and can not effectively simulate the actual working condition of the piston pump. In the running process of the plunger pump, the plunger rotates around the main shaft and reciprocates in the cylinder body, the motion state of the plunger is relatively complex, so that a supporting oil film between the sliding shoe pairs is in a dynamic pressure supporting balance state, and the test process of the traditional plane pair supporting structure test method is inaccurate. Therefore, a sliding shoe pair bearing characteristic measuring device capable of effectively simulating the actual working condition of the plunger pump needs to be designed.

Disclosure of Invention

In order to solve the practical problem that the bearing characteristic of a piston shoe pair of a high-pressure plunger pump is difficult to detect, the invention provides a composite multi-sensor plunger pump piston shoe pair bearing characteristic simulation test mechanism.

The invention aims to realize the working condition simulation and the bearing characteristic measurement of a high-pressure plunger pump sliding shoe pair, and is realized by the following technical scheme:

the invention provides a composite multi-sensor plunger pump sliding shoe pair bearing characteristic simulation test mechanism which comprises an experimental device and an embedded bearing characteristic acquisition module, wherein the experimental device comprises a base and a sliding shoe pair bearing characteristic simulation platform; the experimental device comprises a pressure cavity, a transmission shaft, a swash plate, a cylinder body, a plunger, a swash plate thrust rod and a return spring; wherein the tail end of the transmission shaft is connected with the power output device through a coupler, and the ball end is connected with the swash plate through a universal coupling mechanism; one end of the return spring is fixed on the inner wall of the pressure containing cavity, and the other end of the return spring is abutted against the swash plate; the adjusting end of the swash plate thrust rod penetrates out of the pressure cavity, and the other end of the swash plate thrust rod is abutted to the swash plate; the angle of the swash plate can be adjusted by adjusting the thrust rod of the swash plate and the return spring so as to simulate the variable process of the swash plate variable pump; the pressure cavity provides a pressure environment through a pressure maintaining pressure oil source and is used for simulating the oil pressure state in the pump shell of the plunger pump; the cylinder body is fixed in the pressure containing cavity, and the plungers are distributed and placed in the cylinder body; the pressure between the plunger and the cavity of the cylinder body is switched between high pressure and low pressure through a pulsation simulator, so that the real working condition of the plunger pump is simulated;

the embedded bearing characteristic acquisition module comprises embedded pressure sensors and embedded displacement sensors, wherein the embedded pressure sensors are uniformly distributed on the surface of the contact surface of the plunger and the swash plate and are distributed in a cross shape; the embedded displacement sensors are uniformly distributed on the surface of the contact surface of the plunger and the swash plate and are installed at intervals with the embedded pressure sensors; the pressure characteristic and the oil film dimension characteristic of a gap supporting oil film between the plunger and the swash plate can be monitored in real time through the embedded pressure sensor and the embedded displacement sensor, and the working condition simulation test and analysis of the oil film bearing characteristic are realized.

Furthermore, the return spring is a thrust spring and is arranged in parallel with the transmission shaft.

Furthermore, the swash plate thrust rod is arranged in parallel with the transmission shaft, and the horizontal position of the swash plate thrust rod can be adjusted through an adjusting end outside the pressure containing cavity.

Furthermore, the inlet of each plunger is provided with a set of pressure pulse simulator, each pressure pulse simulator comprises an electro-proportional valve and a pulse simulator, pulse signals sent by the pulse simulators act on an electromagnet used for driving a valve core in the electro-proportional valve, and the control of the oil pressure in the plunger is realized by controlling the valve core of the electro-proportional valve. (ii) a The pressure pulse simulation device is used for simulating the high-low pressure switching working condition of the actual axial plunger pump plunger cavity, and the pressure of an oil source of an oil inlet connected with the electro-proportional valve is the same as the actual load working condition of the axial plunger pump.

Furthermore, the pressure containing cavity is a pressure-resistant containing cavity, and the pressure of the containing cavity is controlled by a pressure-maintaining pressure oil source.

Furthermore, the pulsation simulator controls the opening and closing of the electro proportional valve by loading a control waveform according with a pressure pulsation rule, so that the simulation of the high-low pressure switching state of the inlet and the outlet of the plunger pump is realized.

Furthermore, the embedded pressure sensor and the embedded displacement sensor are wireless communication sensors or wired communication sensors.

The invention has the beneficial effects that:

1. the slipper pair bearing characteristic simulation test mechanism can simulate the pressure environment of the slipper pair working in the plunger pump shell, and the bearing characteristic detection is more accurate.

2. The simulation of the switching state of the pressure in the plunger cavity along with the rotation of the main shaft can be realized through the electro-proportional valve.

3. The embedded bearing characteristic acquisition module can measure the pressure and the oil film thickness in a plane and can detect the dynamic change characteristic of the oil film.

Drawings

The invention is further described with reference to the following figures and examples.

FIG. 1 is a cross-sectional view of the apparatus;

FIG. 2 is a view of the construction of the slipper;

in the figure, a transmission shaft 1, a swash plate thrust rod 2, a cylinder block 3, a return spring 4, a pressure cavity 5, a swash plate 6, a plunger 7, an electro-proportional valve 8, a driving electromagnet 9, a pulsation simulator 10, an oil inlet oil source 11, a pressure maintaining pressure oil source 12, an embedded displacement sensor 13 and an embedded pressure sensor 14.

Detailed Description

The invention, which is further described below with reference to the accompanying drawings and specific examples, may be embodied in many different forms of embodiments and should not be construed as limited to the embodiments set forth herein.

As shown in fig. 1-2, the multi-compound multi-sensor plunger pump slipper pair bearing characteristic simulation test mechanism comprises an experimental device and an embedded bearing characteristic acquisition module.

As shown in fig. 1, the experimental device includes a pressure chamber 5, a transmission shaft 1, a swash plate 6, a cylinder block 3, a plunger 7, a swash plate thrust rod 2, and a return spring 4. As shown in fig. 1. The transmission shaft is connected with the swash plate in a spherical hinge structure, and the testing swing angle of the swash plate can be controlled by adjusting the feeding depth of the thrust rod of the swash plate; the return spring is a thrust spring; the pressure of the containing cavity is controlled by a pressure maintaining pressure oil source; the cylinder body is fixed in the pressure containing cavity; the number of the plungers arranged in the cylinder body can be odd or even; the pressure of the pressure maintaining pressure oil source and the pressure of the oil inlet oil source can be different; the pressure of the cavity of each plunger and the cylinder body is controlled by an electric proportional valve; the electro proportional valve is controlled by driving the electromagnet; the driving force of the driving electromagnet is in a linear relation with the pulse simulator; the drive curve of the pulse simulator is the same as the pressure switching curve of the plunger pump.

As shown in fig. 2, the embedded load-bearing characteristic acquisition module includes an embedded pressure sensor 14 and an embedded displacement sensor 13. The embedded pressure sensors are uniformly distributed on the surface of the contact surface of the plunger and the swash plate and are distributed in a cross shape; the embedded displacement sensors are uniformly distributed on the surface of the contact surface of the plunger and the swash plate and are installed at intervals with the embedded pressure sensors; the pressure characteristic and the oil film dimension characteristic of a gap supporting oil film between the plunger and the swash plate can be monitored in real time through the embedded pressure sensor and the embedded displacement sensor, and the working condition simulation test of the oil film bearing characteristic is realized.

In a specific embodiment of the invention, one end of the transmission shaft 1 is connected with the motor through a coupler, the other end is a coupling structure, and a ball head structure of the coupling can realize slight swing of the swash plate so as to simulate a variable process of the axial plunger pump.

The swing of the swash plate is adjusted by adjusting the feeding amount of the swash plate thrust rod 2, and the return spring 4 is a thrust spring; the pressure within the housing is determined by a dwell pressure oil source 12 for simulating the pressure conditions of the pump housing.

The return spring 4 is arranged in parallel with the transmission shaft 1, one end of the return spring is fixed on the inner wall of the pressure cavity 5, and the other end of the return spring is abutted against the swash plate 6. The swash plate thrust rod 2 is arranged in parallel with the transmission shaft 1, the adjusting end of the swash plate thrust rod penetrates out of the pressure cavity 5, and the other end of the swash plate thrust rod is abutted to the swash plate 6.

And a set of pressure pulse simulation device is arranged at the inlet of each plunger, each pressure pulse simulation device consists of an electro-proportional valve 8 and a pulse simulator 10, wherein a pulse signal sent by the pulse simulator 10 acts on an electromagnet 9 used for driving a valve core in the electro-proportional valve 8, and the control of the oil pressure in the plunger is realized by controlling the valve core. The pressure pulse simulation device is used for simulating the high-low pressure switching working condition of the actual axial plunger pump plunger cavity, and the pressure of an oil source 11 of an oil inlet of the electro-proportional valve 8 is the same as the actual load working condition of the axial plunger pump.

The sliding shoe pair does not have rotary motion, so that a sensor array for detecting the state of the friction pair is processed on the surface of the sliding shoe pair; the pressure sensor is a flexible resistance film pressure sensor, the displacement sensor adopts a Hall displacement sensor, and both miniaturization and embedded installation can be realized.

The testing steps of the testing mechanism are as follows: the electro proportional valve is controlled through the pulsation simulator, so that high-low pressure switching of oil in the plunger cavity is realized; adjusting a thrust rod of the swash plate to change the swing angle of the swash plate; acquiring static and static pressure support dynamic and static characteristics of the slipper pairs through embedded pressure sensors and embedded displacement sensors, and constructing a pressure field and a thickness field of each slipper pair to obtain key parameter test data of the slipper pairs; and finally, transmitting the data acquired by the sensor into an upper computer.

Therefore, use this application embodiment on the one hand can realize under the high pressure operating mode, and the detection of piston shoe pair load-carrying characteristic improves the authenticity and the accuracy that detect, and on the other hand can reduce the destruction to the main pump entity, and the mode through the operating mode simulation is with the piston pump's piston shoe pair independently play structure itself, practices thrift the experiment cost.