Rotary friction tester for simulating aviation high-temperature lubrication working condition and test method

Abstract

The invention discloses a rotary friction tester for simulating an aviation high-temperature lubrication working condition and a test method, and relates to the technical field of tribology experiments. The rotary friction tester comprises a driving assembly, a rotary friction assembly and a detection assembly which are sequentially arranged on a support frame from top to bottom, the driving assembly comprises a motor and a rotating shaft. The motor drives the rotating shaft to rotate around the axis. The rotary friction assembly comprises an upper clamp and a lubricating medium storage pool, the upper clamp is used for fixing the upper half part of the friction part, and the lubricating medium storage pool is used for fixing the lower half part of the friction part; the detection assembly comprises a force sensor, a torque sensor and a guide column jacking air cylinder, the guide column jacking air cylinder is used for adjusting positive pressure applied to the friction part, the force sensor is used for detecting the value of the positive pressure in real time, and the torque sensor is used for detecting the value of the torque in real time. According to the invention, circulation of the lubricating medium is realized, and dynamic monitoring and performance analysis of the lubricating working condition of the rotating member under different working parameter conditions are realized.

Description

Technical Field

[0001] The invention belongs to the technical field of tribology experiments, and in particular relates to a rotary friction tester and a test method for simulating aviation high-temperature lubrication working conditions. Background Art

[0002] Friction itself is a complex process of thermal coupling. An important feature of friction heat generation is that it increases the temperature of the material in the friction system. The increase in temperature and the temperature gradient will affect the material properties of friction, because the mechanical properties of the material have a great influence on the friction performance, and the mechanical properties of the material are affected by temperature changes. By deriving the relationship between the mechanical properties of the material and temperature, and then based on the relationship between the friction force and the friction coefficient and the mechanical properties of the material, the law of friction force changing with temperature can be obtained. Therefore, it is extremely important to study the influence of temperature on tribology. In actual work, the working temperature is often different, which leads to changes in friction performance. Taking the aviation combined transmission generator shaft system as an example, the high-speed seal at the shaft end is composed of a graphite static ring and a metal dynamic ring. The graphite ring and the metal ring rotate and rub tightly together, and the heat generated by friction will cause the temperature rise of the contact interface to rise rapidly. When the medium temperature is 100℃, the local temperature of the friction surface of the graphite ring can reach 200-310℃, which brings about a complex friction-heat coupling effect. Therefore, a tribology tester that can simulate the high-temperature lubrication conditions of aviation is urgently needed to support related research. Among them, bearings, seals and other components in aviation high-speed shaft systems usually work in a high-temperature lubricating medium environment, so the study of tribological characteristics under the coupling of environmental heat and frictional heat has good engineering significance.

[0003] In addition, about 1 / 3 of primary energy is consumed in friction and wear, and about 70% of equipment damage is caused by various forms of wear. Therefore, reducing friction and wear is of great significance to improving the effective utilization of energy and the service life of equipment. The wear of the friction pair surface is related to many factors, among which the lubricating medium is one of the important factors. Different lubricating media mainly affect the oil film formation, lubrication state and wear form on the friction pair surface. In actual work, the lubricating medium-related experiments conducted often cause changes in the lubricating medium concentration due to the advancement of the experiment, which causes slight changes in the friction experiment. Therefore, ensuring the stability of the lubricating medium during the experiment is of great significance for experimental research. Under high temperature conditions in aviation, lubricating oil is easily affected by oxidation and degradation, resulting in oil aging, reducing its lubrication performance and life. At the same time, lubricating oil is easily contaminated, such as oxidation, metal dust, etc., which affects the lubrication effect and the accuracy of the test results. It is necessary to update the lubricating oil of the friction test parts in time to ensure its lubricating oil quality.

[0004] The present invention proposes a rotary friction tester and a testing method for simulating aviation high-temperature lubrication conditions, which can simulate the replacement of lubricating media during aviation lubrication conditions, so that the lubricating media remains stable during the experiment and is not affected by temperature, oxidation, abrasive particles, etc., thereby ensuring the accuracy and repeatability of the lubrication effect and experimental results. Summary of the invention

[0005] The purpose of the present invention is to provide a rotary friction tester and a testing method for simulating high-temperature lubrication conditions in aviation, so as to solve the problems such as the instability of the lubricating medium in the friction test process in the prior art mentioned in the above background technology.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] The first aspect of the present invention provides a rotary friction tester for simulating aviation high-temperature lubrication conditions, comprising a driving assembly, a rotary friction assembly and a detection assembly arranged in sequence from top to bottom on a support frame; the support frame is mounted on a bottom plate;

[0008] The driving assembly includes a motor and a rotating shaft, which are respectively installed on both sides of the top of the support frame, and the motor drives the rotating shaft to rotate around the axis;

[0009] The rotary friction assembly includes an upper clamp and a lubricating medium storage tank;

[0010] The upper clamp is connected to the bottom of the rotary shaft through the upper clamp and the shaft connecting member, and is used to fix the upper half of the friction member;

[0011] The lubricating medium storage tank is located below the upper fixture, and the lubricating medium storage tank stores lubricating circulating medium inside, and the inner bottom surface is connected to the thrust spherical bearing; a heating component is provided above the thrust spherical bearing; the lubricating medium storage tank is used to fix the lower half of the friction part, and the lower half of the friction part is calibrated by the thrust spherical bearing to always keep it level, ensuring that the friction interface is sufficient;

[0012] The detection assembly includes a force sensor, a torque sensor and a guide column lifting cylinder; the force sensor, the torque sensor and the guide column lifting cylinder are arranged axially along the rotary shaft and are sequentially connected from top to bottom, the force sensor is connected below the lubricating medium storage tank, and the guide column lifting cylinder is placed on the bottom plate;

[0013] The guide column lifting cylinder is used to drive the lubricating medium storage pool to move axially and adjust the positive pressure applied to the friction member;

[0014] The force sensor is used to detect the positive pressure value applied to the friction member in real time, and the detection data is fed back to the signal processing system;

[0015] The torque sensor is used to detect the torque value generated by the friction member when the rotary shaft rotates in real time, and the detection data is fed back to the signal processing system;

[0016] The motor of the driving component is used to provide the power for rotation, so that the friction parts of the rotating friction component can rotate. The lubricating medium circulation system is used to continuously provide sufficient lubricating medium for the friction pair; the heating component is used to create a high temperature environment for the friction pair; the guide column lifting cylinder is used to apply positive pressure to the friction parts, and the force sensor of the detection component is used to measure the magnitude of the applied positive pressure in real time. The torque sensor of the detection component is used to detect the friction torque between the upper and lower friction parts, and finally the friction coefficient data is obtained. High temperature conditions will accelerate the oxidation and deterioration of lubricating oil. Frequent replacement of lubricating oil is cumbersome and time-consuming, which is inconsistent with aviation lubrication conditions. At the same time, the cooling effect of lubricating oil is limited, resulting in overheating of friction test components, affecting the experimental results and equipment life. The present invention realizes the circulation of lubricating medium and dynamic monitoring and performance analysis of the lubrication conditions of rotating parts under different working parameters.

[0017] Preferably, the signal processing system includes an information collector and a computer; the positive pressure detected in real time by the force sensor and the torque value detected in real time by the torque sensor are collected by the information collector and transmitted to the computer, where they are recorded and displayed.

[0018] Preferably, it also includes a lubricating medium circulation system, and the lubricating medium circulation system is arranged on the bottom plate;

[0019] The lubricating medium circulation system comprises an oil inlet pipe, an oil outlet pipe, a cycloid pump, an oil pump motor unit and a tank body; one end of the oil inlet pipe and the oil outlet pipe are connected to the lubricating medium storage tank through a high-pressure ferrule joint, and the other end is connected to the cycloid pump through a pagoda joint; two cycloid pumps are respectively connected to the two sides of the tank body through connecting pipes, and are connected to the oil pump motor unit, and the oil pump motor unit and the tank body are connected to the bottom plate through bolts;

[0020] The lubricating medium storage tank, the oil inlet pipe, the oil outlet pipe, the cycloid pump and the tank body form a circulation loop, and a speed regulating valve is arranged on the circulation loop.

[0021] Preferably, the heating assembly includes a heating plate and a heat insulation plate; the heat insulation plate is placed above the thrust spherical bearing, and the heating plate is placed above the heat insulation plate; the heating plate adopts a cast aluminum temperature-controlled electric heating plate, and the temperature of the heating plate is adjusted by a temperature controller; the heating plate and the heat insulation plate are fixed and maintained in contact with the lower half of the friction part by applying positive pressure through a force sensor.

[0022] Preferably, the support frame includes an upper top plate and two side plates connected to both sides below the upper top plate;

[0023] The motor is connected to one side of the upper top plate by bolts, the rotary shaft is connected to the bearing sleeve by two angular contact ball bearings through interference fit, and the bearing sleeve is connected to the other side of the upper top plate by bolts; the rotary shaft is connected to the motor through a synchronous wheel and a belt.

[0024] Furthermore, the rotary shaft uses an anti-drop nut to limit the axial displacement of the rotary shaft.

[0025] Preferably, the force sensor is connected to the torque sensor via a sensor connector, and the torque sensor is connected to the guide column lifting cylinder via a cylinder and a torque sensor connector;

[0026] The top of the guide column lifting cylinder is connected to the side plate through a platform connecting piece, and support pieces are connected to both sides of the bottom of the platform connecting piece. The bottom of the support piece is connected to the bottom plate to ensure the stability of the guide column lifting cylinder when it is lifted up and down.

[0027] Preferably, the force sensor is a spoke-type weighing sensor, and the torque sensor is a double-flange torque sensor.

[0028] The second aspect of the present invention provides a rotary friction test method for simulating aviation high-temperature lubrication conditions using the rotary friction tester as described above, comprising the following steps:

[0029] S1. The upper and lower parts of the friction parts are respectively mounted on the upper fixture and the thrust spherical bearing of the lubricating medium storage tank for fixing; the lubricating medium is injected into the lubricating medium storage tank through a circulation loop to keep the circulation of the lubricating medium stable;

[0030] S2. Keep the applied positive pressure and the preheating temperature of the friction parts unchanged, adjust the motor speed to different set speed values ​​one by one, and record the corresponding measurement values ​​of the torque sensor one by one; test the influence of different driving speeds on the friction performance;

[0031] S3, keeping the motor speed and the preheating temperature of the friction member unchanged, adjusting the positive pressure applied to the friction member to different set values ​​one by one, and recording the corresponding measured values ​​of the torque sensor one by one; testing the influence of different positive pressures on the friction performance;

[0032] S4. Keep the applied positive pressure and motor speed unchanged, adjust the preheating temperature of the friction parts to different set values ​​one by one, and record the corresponding measured values ​​of the torque sensor one by one; test the influence of different working temperatures on the friction performance;

[0033] S5. Keep the applied positive pressure, motor speed and preheating temperature of the friction parts unchanged, replace the lubricating medium with different set lubricating media one by one, and record the corresponding measurement values ​​of the torque sensor one by one; test the influence of different lubricating media on the friction performance.

[0034] Preferably, S2 is specifically as follows:

[0035] S201, adjusting the height of the cylinder by means of a guide column and detecting by means of a force sensor, determining that the applied positive pressure is a set value and that the circulation of the lubricating medium is stable;

[0036] S202, adjusting the temperature of the heating plate to preheat the friction piece to a set temperature;

[0037] S203, controlling the motor to increase speed to an initially set speed value, and recording the measured value of the torque sensor;

[0038] S204, adjusting the motor speed to other set speed values ​​one by one, and recording the corresponding measurement values ​​of the torque sensor one by one;

[0039] S205, completing the performance impact test on friction at different driving speeds, and shutting down the motor and the oil pump motor unit.

[0040] Preferably, S3 is specifically as follows:

[0041] S301, adjusting the height of the cylinder by means of a guide column and detecting by means of a force sensor, determining that the positive pressure applied is an initial set value, and determining that the circulation of the lubricating medium is stable;

[0042] S302, adjusting the temperature of the heating plate to preheat the friction piece to a set temperature;

[0043] S303, controlling the motor to increase speed to a set speed value, and recording the measured value of the torque sensor;

[0044] S304, shut down the motor and the oil pump motor group;

[0045] S305. The height is adjusted by lifting the cylinder through the guide column and the force sensor is used for detection to determine that the positive pressure applied is other set values. S301-S304 are cycled to record the corresponding measurement values ​​of the torque sensor one by one to complete the performance impact test on friction under different positive pressures.

[0046] Preferably, the S4 is specifically as follows:

[0047] S401, adjusting the height of the cylinder by means of a guide column and detecting by means of a force sensor, determining that the applied positive pressure is a set value and that the circulation of the lubricating medium is stable;

[0048] S402, adjusting the temperature of the heating plate to preheat the friction piece to an initial set temperature;

[0049] S403, controlling the motor to increase speed to a set speed value, and recording the measured value of the torque sensor;

[0050] S404, shut down the motor and the oil pump motor group;

[0051] S405, adjusting the temperature of the heating plate to preheat the friction parts to other set temperatures, determining the preheating temperature to be other set values, looping S401-S404, recording the corresponding measurement values ​​of the torque sensor one by one, and completing the performance impact test on friction under different working temperatures.

[0052] Preferably, the S5 is specifically as follows:

[0053] S501, adjusting the height by lifting the cylinder with a guide column and detecting with a force sensor to determine that the positive pressure applied is the set value, the lubricating medium in the pool body is the initial lubricating medium and the lubricating medium circulation is stable;

[0054] S502, adjusting the temperature of the heating plate to preheat the friction piece to a set temperature;

[0055] S503, controlling the motor to increase speed to a set speed value, and recording the measurement value of the torque sensor;

[0056] S504, shut down the motor and the oil pump motor group;

[0057] S505, replace the lubricating medium in the tank body with other lubricating media, cycle S501-S504, record the corresponding measured values ​​of the torque sensor one by one, and complete the performance impact test on friction under different lubricating media.

[0058] Compared with the prior art, the present invention has the following beneficial effects:

[0059] The present invention proposes a new rotary friction tester for simulating aviation high-temperature lubrication working conditions, and also proposes a corresponding test method, using a motor to provide rotary power to generate relative friction between the friction parts, using a lubricating medium circulation system to provide sufficient lubricating medium with stable concentration for the friction parts, using a guide column to lift the cylinder to apply positive pressure to the friction parts, using a force sensor to measure the magnitude of the applied positive pressure in real time, and using a torque sensor to dynamically monitor the generated torque. The present invention fills the gap in the dynamic monitoring and performance analysis of the impact of friction working conditions on performance under different working temperatures, different lubricating media, and different working parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 It is a structural schematic diagram of a rotary friction tester for simulating aviation high-temperature lubrication conditions in the present invention;

[0061] Figure 2 It is a rear view of the rotary friction tester for simulating aviation high-temperature lubrication working conditions in the present invention;

[0062] Figure 3It is a structural schematic diagram of the lubricating medium storage pool in the present invention;

[0063] Figure 4 It is a structural schematic diagram of the lubricating medium circulation system in the present invention;

[0064] Figure 5 This is a control principle diagram of the detection component and signal processing system in the present invention.

[0065] In the figure: 1. belt; 2. anti-slip nut; 3. bearing sleeve; 4. upper top plate; 5. synchronous wheel; 6. motor; 7. rotary shaft; 8. upper fixture and shaft connecting piece; 9. upper fixture; 10. lubricating medium storage tank; 11. high-pressure ferrule joint; 12. heating plate; 13. heat insulation plate; 14. thrust spherical bearing; 15. force sensor; 16. sensor connecting piece; 17. torque sensor; 18. cylinder and torque sensor connecting piece; 19. guide column lifting cylinder; 20. oil outlet pipe; 21. platform connecting piece; 22. support piece; 23. rib plate; 24. bottom plate; 25. oil pump motor unit; 26. tank body; 27. cycloid pump; 28. oil inlet pipe. DETAILED DESCRIPTION

[0066] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0067] Embodiment 1:

[0068] See also Figure 1-5 The rotary friction tester for simulating aviation high-temperature lubrication conditions includes a driving component, a rotary friction component, a heating component, and a detection component arranged from top to bottom on a support frame, and also includes a lubricating medium circulation system and a signal processing system. The support frame and the lubricating medium circulation system are installed on a bottom plate 24, and the support frame is composed of an upper top plate 4 and side plates connected on both sides below the upper top plate 4.

[0069] In this embodiment, the driving assembly includes a motor 6 and a rotating shaft 7; the motor 6 is a servo motor, which is fixed to the upper top plate 4 by bolts; the rotating shaft 7 is fixed to the bearing sleeve 3 by two angular contact ball bearings through interference fit, and the bearing sleeve 3 is fixed to the upper top plate 4 by bolts, and the rotating shaft 7 uses anti-slip nuts 2 at the top and bottom to limit axial displacement; the rotating shaft 7 is connected to the motor 6 through the synchronous wheel 5 and the belt 1, and the motor 6 drives the rotating shaft 7 to rotate around the axis through the synchronous wheel 5 and the belt 1.

[0070] In this embodiment, the rotary friction assembly includes an upper clamp 9, a lubricating medium storage tank 10 and a thrust spherical bearing 14; the upper clamp 9 is fixed to the rotary shaft 7 through the upper clamp and the shaft connecting member 8, and is arranged along the axial direction of the rotary shaft 7, and is used to fix the upper half of the material of the friction part; the lubricating medium storage tank 10 is located below the upper clamp 9, and is used to store the lubricating circulating medium and fix the lower half of the friction part; the thrust spherical bearing 14 is connected to the inner bottom surface of the lubricating medium storage tank 10, and is clamped and fixed by bolts, and is used to calibrate the lower half of the friction part to always be in a horizontal position to ensure sufficient friction interface.

[0071] In this embodiment, the heating assembly includes a heating plate 12 and a heat insulation plate 13; the heat insulation plate 13 is placed above the thrust spherical bearing 14, and the heating plate 12 is a cast aluminum temperature-controlled heating plate. The heating plate 12 is placed above the heat insulation plate 13 and is fixed and maintained in contact with the friction part by applying positive pressure through a force sensor 15.

[0072] In this embodiment, the detection assembly includes a torque sensor 17, a force sensor 15, and a guide column lifting cylinder 19;

[0073] Specifically, the guide column lifting cylinder 19 is fixed to the platform connecting member 21 by bolts, and the platform connecting member 21 is connected to the support member 22 by bolts at the bottom. The bottom of the support member 22 is fixed to the bottom plate 24 by a rib plate 23 to ensure the stability of the guide column lifting cylinder 19 during operation.

[0074] Specifically, the torque sensor 17 is connected to the torque sensor connector 18 through bolts and a cylinder, and the cylinder and the torque sensor connector 18 are fixed to the guide column lifting cylinder 19 through bolts, and are arranged along the axial direction of the rotary shaft 7, and are used to detect the torque value generated by the friction member;

[0075] The torque sensor 17 is a double-flange torque sensor fixed on the cylinder and the torque sensor connector 18 .

[0076] Specifically, the force sensor 15 is connected to the lower part of the lubricating medium storage tank 10. The force sensor 15 connects the torque sensor 17 to the force sensor 15 through the sensor connector 16. The torque sensor 17 is arranged axially in the same manner as the torque sensor 17, and is used to detect the positive pressure applied to the friction member in real time. The guide column lifting cylinder 19 can drive the force sensor 15 to move axially to adjust the size of the positive pressure.

[0077] The force sensor 15 is a spoke-type weighing sensor, which is fixed on the sensor connecting member 16 , and the sensor connecting member 16 and the torque sensor 17 are fixed by bolts.

[0078] The positive pressure detected in real time by the force sensor 15 and the torque value detected in real time by the torque sensor 17 are then collected by the information collector of the signal processing system and transmitted to the computer, where they are recorded and displayed.

[0079] In this embodiment, the lubricating medium circulation system includes an oil inlet pipe 28, an oil outlet pipe 20, a cycloid pump 27, an oil pump motor unit 25, and a tank body 26; one end of the oil inlet pipe 28 and the oil outlet pipe 20 is connected to the lubricating medium storage tank 10 through a high-pressure ferrule joint 11, and the other end is connected to the cycloid pump 27 through a pagoda joint to form a closed loop; the oil pump motor unit 25 and the tank body 26 are arranged on the bottom plate 24 and connected by bolts. The lubricating medium storage tank 14 and the oil inlet pipe 28, the oil outlet pipe 20, the cycloid pump 27, the oil pump motor unit 25, and the tank body 26 form a circulation loop.

[0080] Based on the above-mentioned rotary friction tester simulating aviation high-temperature lubrication conditions, this embodiment proposes a rotary friction test method simulating aviation high-temperature lubrication conditions, including testing the influence of friction performance under different driving speed conditions, different positive pressure conditions, different temperature conditions or different lubrication medium conditions. The details are as follows:

[0081] The first group of tests on the influence of different driving speeds on friction performance were conducted as follows:

[0082] Step a1, install the upper half of the friction parts on the upper fixture 9, and install the lower half of the friction parts on the thrust spherical bearing 14 of the lubricating medium storage tank 10, check the integrity of the equipment, adjust the height through the guide column lifting cylinder 19, and use the force sensor 15 to detect at the same time, set the positive pressure to the set value, keep the guide column lifting cylinder 19 stable, adjust the speed regulating valve on the circulation loop, open the oil pump motor unit 25, and inject lubricating medium into the lubricating medium storage tank 10 through the circulation loop to keep the lubricating medium circulation stable;

[0083] Step a2, start the heating plate 12, adjust the temperature of the heating plate through the thermostat, and preheat the friction piece;

[0084] Step a3, start the motor 6, control the motor 6 to increase its speed to an initially set speed value through the motor driver, and record the measured value of the torque sensor 17 at this time;

[0085] Step a4, adjusting the speed of the motor 6 to other set speed values ​​one by one through the motor driver, and recording the corresponding measurement values ​​of the torque sensor 17 one by one;

[0086] Step a5, after completing the first set of tests, shut down the motor 6 and the oil pump motor group 25.

[0087] The second group of tests on the effects of different positive pressure conditions on friction performance were conducted as follows:

[0088] Step b1, after completing the first set of tests, the positive pressure between the friction parts is reset by adjusting the guide column lifting cylinder 19 and detecting it by the force sensor 15, and then the oil pump motor unit 25 is powered on to inject lubricating medium into the lubricating medium storage tank 10 through the circulation loop until the lubricating medium storage tank 10 remains stable;

[0089] Step b2, start the heating plate 12, adjust the temperature of the heating plate 12 by the thermostat, and preheat the friction piece;

[0090] Step b3, start the motor 6, control the motor 6 to increase its speed to a set speed value through the motor driver, and record the measured value of the torque sensor 17 at this time;

[0091] Step b4, shut down the motor 6 and the oil pump motor unit 25;

[0092] Step b5, by adjusting the guide column lifting cylinder 19 and detecting with the force sensor 15, the positive pressure on the friction member is set to other set values ​​one by one, and the test is carried out one by one with reference to steps b1 to b4 under different positive pressures, and the corresponding torque sensor 17 measurement values ​​are recorded;

[0093] Step b6, completing the second set of tests, shutting down the motor 6 and the oil pump motor group 25.

[0094] The third group, the test of the influence of different working temperature conditions on friction performance is carried out according to the following steps:

[0095] Step c1, after completing the second set of tests, the positive pressure between the friction parts is reset by adjusting the guide column lifting cylinder 19 and detecting it by the force sensor 15, and then the oil pump motor unit 25 is powered on to inject lubricating medium into the lubricating medium storage tank 10 through the circulation loop until the lubricating medium storage tank 10 remains stable;

[0096] Step c2, start the heating plate 12, adjust the temperature of the heating plate 12 by the thermostat, and reach the set temperature value to preheat the friction piece;

[0097] Step c3, starting the motor 6, controlling the motor 6 to increase its speed to a set speed through the motor driver, and recording the measured value of the torque sensor 17 at this time;

[0098] Step c4, shut down the motor 6 and the oil pump motor group 25;

[0099] Step c5, adjusting the temperature of the heating plate 12 by the thermostat, setting the temperature to other set values ​​one by one, and performing tests one by one at different temperatures referring to steps c1 to c4 respectively and recording the corresponding torque sensor 17 measurement values;

[0100] Step c6, completing the third set of tests, shutting down the motor 6 and the oil pump motor group 25.

[0101] The fourth group, the test of the influence of different lubricating media on friction performance was carried out according to the following steps:

[0102] Step d1, after completing the third set of tests, the positive pressure between the friction parts is reset by adjusting the guide column lifting cylinder 19 and detecting by the force sensor 15, and then the oil pump motor unit 25 is powered on to inject lubricating medium into the lubricating medium storage tank 10 through the circulation loop until the lubricating medium storage tank 10 remains stable;

[0103] Step d2, start the heating plate 12, adjust the temperature of the heating plate 12 by the thermostat to a set temperature value, and preheat the friction piece;

[0104] Step d3, starting the motor 6, controlling the motor 6 to increase its speed to a set speed through the motor driver, and recording the measured value of the torque sensor 17 at this time;

[0105] Step d4, shut down the motor 6 and the oil pump motor unit 25;

[0106] Step d5, replacing the lubricating medium in the tank body (26), injecting different lubricating medium into the lubricating medium storage tank 10 through the circulation loop one by one, and performing tests one by one under different lubricating mediums respectively with reference to steps d1 to d4 and recording the corresponding torque sensor 17 measurement values;

[0107] Step d6, completing the fourth set of tests, shutting down the motor 6 and the oil pump motor group 25.

[0108] The above description is only used to help understand the method of the present invention and its core essence, but the protection scope of the present invention is not limited thereto. For those skilled in the art in the art, equivalent replacement or change according to the technical solution and inventive concept of the present invention within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. Rotary friction tester simulating aviation high temperature lubrication conditions, It is characterized in that It comprises a driving assembly, a rotary friction assembly and a detection assembly which are arranged in sequence from top to bottom on a support frame; the support frame is mounted on a bottom plate (24); The driving assembly comprises a motor (6) and a rotating shaft (7), wherein the motor (6) and the rotating shaft (7) are respectively mounted on two sides of the top of the support frame, and the motor (6) drives the rotating shaft (7) to rotate around an axis; The rotary friction assembly comprises an upper clamp (9) and a lubricating medium storage tank (10); The upper clamp (9) is connected to the bottom of the rotary shaft (7) and is used to fix the upper part of the friction piece; The lubricating medium storage tank (10) is located below the upper clamp (9), and lubricating circulating medium is stored inside the lubricating medium storage tank (10), and a thrust spherical bearing (14) is connected to the inner bottom surface; a heating component is provided above the thrust spherical bearing (14); the lubricating medium storage tank (10) is used to fix the lower half of the friction piece, and the lower half of the friction piece is calibrated by the thrust spherical bearing (14) to always keep it horizontal; The detection assembly comprises a force sensor (15), a torque sensor (17) and a guide column lifting cylinder (19); the force sensor (15), the torque sensor (17) and the guide column lifting cylinder (19) are arranged axially along the rotary shaft (7) and are connected in sequence from top to bottom, the force sensor (15) is connected below the lubricating medium storage tank (10), and the guide column lifting cylinder (19) is placed on a bottom plate (24); The guide column lifting cylinder (19) is used to drive the lubricating medium storage pool (10) to move axially to adjust the positive pressure applied to the friction member; The force sensor (15) is used to detect the positive pressure value applied to the friction member in real time, and the detection data is fed back to the signal processing system; The torque sensor (17) is used to detect in real time the torque value generated by the friction member when the rotary shaft (7) rotates, and the detection data is fed back to the signal processing system.

2. The rotary friction tester for simulating aviation high temperature lubrication conditions according to claim 1, It is characterized in that It also includes a lubricating medium circulation system, and the lubricating medium circulation system is arranged on the bottom plate (24); The lubricating medium circulation system comprises an oil inlet pipe (28), an oil outlet pipe (20), a cycloid pump (27), an oil pump motor unit (25), and a tank body (26); one end of each of the oil inlet pipe (28) and the oil outlet pipe (20) is connected to the lubricating medium storage tank (10) through a high-pressure sleeve joint (11), and the other end is connected to the cycloid pump (27) through a pagoda joint; two cycloid pumps (27) are respectively connected to the two sides of the tank body (26) through connecting pipes, and are connected to the oil pump motor unit (25); the oil pump motor unit (25) and the tank body (26) are connected to the bottom plate (24) through bolts; The lubricating medium storage tank (10), the oil inlet pipe (28), the oil outlet pipe (20), the cycloid pump (27) and the tank body (26) form a circulation loop.

3. The rotary friction tester for simulating aviation high temperature lubrication conditions according to claim 1, It is characterized in that The heating assembly comprises a heating plate (12) and a heat insulation plate (13); the heat insulation plate (13) is placed above the thrust spherical bearing (14), and the heating plate (12) is placed above the heat insulation plate (13).

4. The rotary friction tester for simulating aviation high temperature lubrication conditions according to claim 1, It is characterized in that The support frame comprises an upper top plate (4) and two side plates connected to both sides below the upper top plate (4); The motor (6) is connected to one side of the upper top plate (4) by bolts, the rotary shaft (7) is connected to the bearing sleeve (3) by two angular contact ball bearings through interference fit, and the bearing sleeve (3) is connected to the other side of the upper top plate (4) by bolts; the rotary shaft (7) is connected to the motor (6) by a synchronous wheel (5) and a belt (1).

5. The rotary friction tester for simulating aviation high temperature lubrication conditions according to claim 4, It is characterized in that The force sensor (15) is connected to the torque sensor (17) via a sensor connector (16), and the torque sensor (17) is connected to the guide column lifting cylinder (19) via a cylinder and a torque sensor connector (18); The guide column lifting cylinder (19) is connected to the side plate through a platform connecting member (21) at the top, and support members (22) are connected to both sides of the platform connecting member (21) at the bottom, and the bottom of the support member (22) is connected to the bottom plate (14).

6. The rotary friction tester for simulating aviation high temperature lubrication conditions according to claim 1, It is characterized in that The force sensor (15) is a spoke-type weighing sensor, and the torque sensor (17) is a double-flange torque sensor.

7. A rotary friction test method for simulating aviation high-temperature lubrication conditions using a rotary friction tester as claimed in any one of claims 1 to 6, It is characterized in that The steps include: S1, respectively mounting the upper half and the lower half of the friction member on the upper fixture (9) and the lubricating medium storage tank (10) for fixing; injecting lubricating medium into the lubricating medium storage tank (10) through a circulation loop to keep the circulation of the lubricating medium stable; S2, keeping the applied positive pressure and the preheating temperature of the friction member unchanged, adjusting the speed of the motor (6) to different set speed values ​​one by one, and recording the corresponding measured values ​​of the torque sensor (17) one by one; testing the influence of different driving speeds on the friction performance; S3, keeping the rotation speed of the motor (6) and the preheating temperature of the friction member unchanged, adjusting the positive pressure applied to the friction member to different set values ​​one by one, and recording the corresponding measured values ​​of the torque sensor (17) one by one; testing the influence of different positive pressures on the friction performance; S4, keeping the applied positive pressure and the speed of the motor (6) unchanged, adjusting the preheating temperature of the friction member to different set values ​​one by one, and recording the corresponding measured values ​​of the torque sensor (17) one by one; testing the influence of different working temperatures on the friction performance; S5. Keeping the applied positive pressure, the rotation speed of the motor (6) and the preheating temperature of the friction member unchanged, the lubricating medium is replaced with different set lubricating media one by one, and the corresponding measured values ​​of the torque sensor (17) are recorded one by one; and the influence of different lubricating media on the friction performance is tested.

8. The rotary friction test method for simulating aviation high temperature lubrication conditions according to claim 7, It is characterized in that The S2 is specifically as follows: S201, adjusting the height by means of a guide column lifting cylinder (19) and detecting by means of a force sensor (15), determining that the applied positive pressure is a set value and that the circulation of the lubricating medium is stable; S202, adjusting the temperature of the heating plate (12) to preheat the friction piece to a set temperature; S203, controlling the motor (6) to increase its speed to an initially set speed value, and recording the measurement value of the torque sensor (17); S204, successively adjusting the rotation speed of the motor (6) to other set rotation speed values, and successively recording the corresponding measurement values ​​of the torque sensor (17); S205, completing the performance impact test on friction under different driving speeds, and shutting down the motor (6) and the oil pump motor group (25).

9. The rotary friction test method for simulating aviation high temperature lubrication conditions according to claim 7, It is characterized in that The S3 is as follows: S301, adjusting the height by means of a guide column lifting cylinder (19) and detecting by means of a force sensor (15), determining that the applied positive pressure is an initial set value and that the circulation of the lubricating medium is stable; S302, adjusting the temperature of the heating plate (12) to preheat the friction piece to a set temperature; S303, controlling the motor (6) to increase its speed to a set speed value, and recording the measurement value of the torque sensor (17); S304, shut down the motor (6) and the oil pump motor unit (25); S305, adjusting the applied positive pressure to other set values, looping S301-S304, recording the corresponding measured values ​​of the torque sensor (17) one by one, and completing the performance influence test on friction under different positive pressures.

10. The rotary friction test method for simulating aviation high temperature lubrication conditions according to claim 7, It is characterized in that The S4 is specifically as follows: S401, adjusting the height by means of a guide column lifting cylinder (19) and detecting by means of a force sensor (15), determining that the applied positive pressure is a set value and that the circulation of the lubricating medium is stable; S402, adjusting the temperature of the heating plate (12) to preheat the friction piece to an initial set temperature; S403, controlling the motor (6) to increase its speed to a set speed value, and recording the measured value of the torque sensor (17); S404, shut down the motor (6) and the oil pump motor unit (25); S405, adjusting the preheating temperature to other set values, looping S401-S404, recording the corresponding measured values ​​of the torque sensor (17) one by one, and completing the performance influence test on friction under different working temperatures.

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