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

Abstract

This invention discloses a rotary friction tester and method for simulating high-temperature lubrication conditions in aviation, belonging to the field of tribological experimental technology. The rotary friction tester includes a drive assembly, a rotary friction assembly, and a detection assembly arranged sequentially from top to bottom on a support frame. The drive assembly includes a motor and a rotary shaft, with the motor driving the rotary shaft to rotate around an axis. The rotary friction assembly includes an upper clamp and a lubricating medium storage tank; the upper clamp is used to fix the upper half of the friction component, and the lubricating medium storage tank is used to fix the lower half of the friction component. The detection assembly includes a force sensor, a torque sensor, and a guide column lifting cylinder. The guide column lifting cylinder is used to adjust the normal pressure applied to the friction component, the force sensor is used to detect the normal pressure value in real time, and the torque sensor is used to detect the torque value in real time. This invention realizes the circulation of the lubricating medium and the dynamic monitoring and performance analysis of the lubrication conditions of the rotary component under different operating parameter conditions.

Description

Technical Field

[0001] This invention belongs to the field of tribological experimental technology, and in particular relates to a rotary friction tester and test method for simulating high-temperature lubrication conditions in aviation. Background Technology

[0002] Friction itself is a complex process of thermo-mechanical coupling, and a key characteristic of frictional heat generation is the increased temperature of materials in the friction system. Temperature increases and temperature gradients affect the material properties of friction components, as the mechanical properties of materials significantly influence frictional performance, and these mechanical properties are themselves affected by temperature changes. By deriving the relationship between material mechanical properties and temperature, and then based on the relationship between frictional force and the coefficient of friction and material mechanical properties, the law governing the change of frictional force with temperature can be obtained. Therefore, studying the influence of temperature on tribology is extremely important. In practical applications, operating temperatures often vary, leading to changes in frictional performance. Taking the shaft system of an aerospace combined drive generator as an example, its high-speed seal at the shaft end consists of a graphite stationary ring and a metal rotating ring. The graphite ring and the metal ring rotate and rub against each other in close contact, and the heat generated by this friction causes a rapid rise in the temperature of the contact interface. When the medium temperature is 100℃, the local temperature of the graphite ring friction surface can reach 200-310℃, resulting in a complex form of frictional-thermal coupling. Therefore, a tribological testing instrument capable of simulating high-temperature lubrication conditions in aerospace is urgently needed to support related research. Among them, bearings, seals and other components in high-speed aerospace shaft systems usually operate in high-temperature lubrication media environments. Therefore, the study of tribological properties under the coupling effect of environmental heat and frictional heat has good engineering significance.

[0003] Furthermore, approximately one-third of primary energy consumption is due to friction and wear, and about 70% of equipment damage is caused by various forms of wear. Therefore, reducing friction and wear is crucial for improving energy efficiency and extending equipment lifespan. Wear on friction pair surfaces is related to multiple factors, with lubricating media being a significant one. Different lubricating media primarily affect oil film formation, lubrication status, and wear patterns on the friction pair surface. In practical work, experiments involving lubricating media often experience changes in concentration and other parameters as the experiment progresses, leading to subtle variations in the friction test results. Therefore, ensuring the stability of the lubricating media during the experiment is of paramount importance for research. Under high-temperature conditions in aviation, lubricating oil is susceptible to oxidation and degradation, leading to oil aging and reduced lubrication performance and lifespan. Simultaneously, lubricating oil is easily contaminated, such as by oxidation and metal dust, affecting lubrication effectiveness and the accuracy of test results. Timely replacement of the lubricating oil in friction test components is necessary to ensure its quality.

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

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

[0006] To achieve the above objectives, the present invention employs the following technical solution:

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

[0008] The drive assembly includes a motor and a rotary shaft, which are respectively mounted on the top two sides of the support frame. The motor drives the rotary 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 rotating shaft via the upper clamp and the shaft connector, and is used to fix the upper half of the friction component;

[0011] The lubricating medium storage pool is located below the upper clamp. The lubricating medium storage pool stores the lubricating circulating medium, and a thrust joint bearing is connected to the bottom surface of the pool. A heating component is provided above the thrust joint bearing. The lubricating medium storage pool is used to fix the lower half of the friction component, and the lower half of the friction component is always kept horizontal by calibrating the thrust joint bearing to ensure sufficient friction interface.

[0012] The detection assembly includes a force sensor, a torque sensor, and a guide column lifting cylinder; the force sensor, torque sensor, and guide column lifting cylinder are arranged axially along the rotation axis and connected sequentially 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 base 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 parts.

[0014] The force sensor is used to detect the normal force applied to the friction component 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 on the friction components when the rotary shaft rotates in real time, and the detection data is fed back to the signal processing system.

[0016] The invention utilizes a motor in the drive assembly to provide rotational power, causing the friction components of the rotary friction assembly to rotate. A lubricating medium circulation system continuously provides sufficient lubricating medium to the friction pair. A heating assembly creates a high-temperature environment for the friction pair. A guide column lifting cylinder applies positive pressure to the friction components. A force sensor in the detection assembly measures the magnitude of the applied positive pressure in real time, and a torque sensor in the detection assembly detects the friction torque between the upper and lower friction components, ultimately obtaining the friction coefficient data. High-temperature conditions accelerate the oxidation and deterioration of lubricating oil. Frequent lubricating oil changes are cumbersome and time-consuming, inconsistent with aviation lubrication conditions. Furthermore, the cooling effect of the lubricating oil is limited, leading to overheating of the friction test components, affecting experimental results and equipment lifespan. This invention achieves the circulation of lubricating medium and dynamic monitoring and performance analysis of the lubrication conditions of the rotating components under different operating parameters.

[0017] Preferably, the signal processing system includes an information acquisition unit 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 acquired by the information acquisition unit and transmitted to the computer, where they are recorded and displayed.

[0018] Preferably, it also includes a lubricating medium circulation system, which is disposed on the base plate;

[0019] The lubricating medium circulation system includes an oil inlet pipe, an oil outlet pipe, a cycloidal pump, an oil pump motor unit, and a tank. One end of the oil inlet pipe and the oil outlet pipe are connected to the lubricating medium storage tank via a high-pressure compression fitting, and the other end is connected to the cycloidal pump via a pagoda fitting. The two cycloidal pumps are respectively connected to both sides of the tank via connecting pipes and to the oil pump motor unit. The oil pump motor unit is bolted to the tank and attached to the base plate.

[0020] The lubricating medium storage tank, together with the oil inlet pipe, oil outlet pipe, cycloidal pump, and tank body, forms a circulation loop, and a speed regulating valve is provided 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 joint bearing, and the heating plate is placed above the heat insulation plate; the heating plate is a cast aluminum heating plate with temperature control, and the temperature of the heating plate is adjusted by a temperature controller; the heating plate and the heat insulation plate are fixed and kept in contact with the lower half of the friction component by applying positive pressure through a force sensor.

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

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

[0024] Furthermore, the rotary shaft is fitted with an anti-loosening nut to restrict 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 the torque sensor connector.

[0026] The guide column lifting cylinder is connected to the side plate via a platform connector. Support members are connected to both sides below the platform connector. The bottom of the support members is connected to the base plate to ensure the stability of the guide column lifting cylinder when it moves up and down.

[0027] Preferably, the force sensor is a spoke-type load cell, and the torque sensor is a dual-flange torque sensor.

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

[0029] S1. Fix the upper and lower halves of the friction component onto the upper clamp and the thrust spherical bearing of the lubricating medium storage tank, respectively; inject lubricating medium into the lubricating medium storage tank through the circulation loop to maintain stable circulation of the lubricating medium.

[0030] S2. Keep the applied positive pressure and the preheating temperature of the friction parts constant, 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 effect of different drive speeds on friction performance.

[0031] S3. Keep the motor speed and the preheating temperature of the friction parts constant, and adjust the normal pressure applied to the friction parts to different set values ​​one by one, and record the corresponding measurement values ​​of the torque sensor one by one; test the effect of different normal pressures on the friction performance.

[0032] S4. Keeping the applied positive pressure and motor speed constant, the preheating temperature of the friction parts is adjusted to different set values ​​one by one, and the corresponding measurement values ​​of the torque sensor are recorded one by one; test the effect of different working temperatures on the friction performance.

[0033] S5. Keep the applied positive pressure, motor speed and preheating temperature of the friction parts constant, and change the lubricating medium to different set lubricating media one by one, and record the corresponding measurement value of the torque sensor one by one; test the effect of different lubricating media on friction performance.

[0034] Preferably, step S2 is as follows:

[0035] S201. The height is adjusted by the guide column lifting cylinder and detected by the force sensor to determine that the applied positive pressure is the set value and to ensure that the lubricating medium circulation is stable.

[0036] S202. Adjust the temperature of the heating plate to preheat the friction parts to the set temperature;

[0037] S203. Control the motor to speed up to the initial set speed value and record the measurement value of the torque sensor;

[0038] S204. Adjust the motor speed to each of the other set speed values ​​one by one, and record the corresponding measured values ​​of the torque sensor one by one;

[0039] S205. Complete the performance test of friction under different drive speeds, and shut down the motor and oil pump motor unit.

[0040] Preferably, step S3 is as follows:

[0041] S301. The height is adjusted by the guide column lifting cylinder and the force sensor is used to detect and determine that the applied positive pressure is the initial set value, and the circulation of the lubricating medium is stable.

[0042] S302. Adjust the temperature of the heating plate to preheat the friction parts to the set temperature;

[0043] S303, Control the motor to speed up to the set speed value, and record the measurement value of the torque sensor;

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

[0045] S305. Adjust the height using the guide column lifting cylinder and use the force sensor to detect and determine the applied positive pressure as other set values. Cycle through S301-S304, and record the corresponding measurement values ​​of the torque sensor each time to complete the performance test of friction under different positive pressures.

[0046] Preferably, step S4 is as follows:

[0047] S401. The height is adjusted by the guide column lifting cylinder and detected by the force sensor to determine that the applied positive pressure is the set value and to ensure that the lubricating medium circulation is stable.

[0048] S402. Adjust the temperature of the heating plate to preheat the friction parts to the initial set temperature;

[0049] S403, Control the motor to speed up to the set speed value, and record the measurement value of the torque sensor;

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

[0051] S405. Adjust the temperature of the heating plate to preheat the friction parts to other set temperatures, and determine the preheating temperature as other set values. Cycle through S401-S404, and record the corresponding measurement values ​​of the torque sensor each time to complete the performance test of friction under different working temperatures.

[0052] Preferably, step S5 is as follows:

[0053] S501. The height is adjusted by the guide column lifting cylinder and the force sensor is used to detect and determine that the applied positive pressure is the set value. The lubricating medium in the pool is the initial lubricating medium and the circulation of the lubricating medium is stable.

[0054] S502. Adjust the temperature of the heating plate to preheat the friction parts to the set temperature;

[0055] S503: Control the motor to speed up to the set speed value and record the measurement value of the torque sensor;

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

[0057] S505. Replace the lubricating medium in the pool with other lubricating media, cycle through S501-S504, and record the corresponding measurement values ​​of the torque sensor each time to complete the performance test of friction under different lubricating media.

[0058] Compared with the prior art, the beneficial effects of the present invention are:

[0059] This invention proposes a novel rotary friction tester for simulating high-temperature lubrication conditions in aviation applications, along with a corresponding testing method. A motor provides rotational power to generate relative friction between the friction components. A lubricating medium circulation system provides the components with a sufficient and stable concentration of lubricating medium. A guide column lifting cylinder applies normal pressure to the friction components. A force sensor measures the applied normal pressure in real time, and a torque sensor dynamically monitors the generated torque. This invention fills the gap in the dynamic monitoring and performance analysis of the impact of different operating temperatures, lubricating media, and operating parameters on friction performance. Attached Figure Description

[0060] Figure 1 This is a schematic diagram of the rotary friction tester for simulating high-temperature lubrication conditions in aviation according to the present invention.

[0061] Figure 2 This is a rear view of the rotary friction tester for simulating high-temperature lubrication conditions in aviation, as described in this invention.

[0062] Figure 3This is a schematic diagram of the structure of the lubricating medium storage tank in this invention;

[0063] Figure 4 This is a schematic diagram of the lubricating medium circulation system in this invention;

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

[0065] In the diagram: 1. Belt; 2. Anti-loosening nut; 3. Bearing sleeve; 4. Top plate; 5. Synchronous pulley; 6. Motor; 7. Rotary shaft; 8. Upper clamp and shaft connector; 9. Upper clamp; 10. Lubricating medium storage tank; 11. High-pressure ferrule connector; 12. Heating plate; 13. Heat insulation plate; 14. Thrust spherical bearing; 15. Force sensor; 16. Sensor connector; 17. Torque sensor; 18. Cylinder and torque sensor connector; 19. Guide column lifting cylinder; 20. Oil outlet pipe; 21. Platform connector; 22. Support component; 23. Rib plate; 24. Base plate; 25. Oil pump motor unit; 26. Tank body; 27. Cycloidal pump; 28. Oil inlet pipe. Detailed Implementation

[0066] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0067] Example 1:

[0068] See Figure 1-5 The rotary friction tester, simulating high-temperature lubrication conditions in aviation, includes a drive assembly, a rotary friction assembly, a heating assembly, and a detection assembly arranged sequentially from top to bottom on a support frame. It also includes a lubrication medium circulation system and a signal processing system. The support frame and lubrication medium circulation system are mounted on a base plate 24. The support frame consists of an upper top plate 4 and side plates connected to both sides below the upper top plate 4.

[0069] In this embodiment, the drive assembly includes a motor 6 and a rotary shaft 7. The motor 6 is a servo motor, which is fixed to the upper top plate 4 by bolts. The rotary shaft 7 is fixed to the bearing sleeve 3 by two angular contact ball bearings through interference fit. The bearing sleeve 3 is fixed to the upper top plate 4 by bolts. The rotary shaft 7 is equipped with anti-loosening nuts 2 at the top and bottom to limit axial displacement. The rotary shaft 7 is connected to the motor 6 through a synchronous pulley 5 and a belt 1. The motor 6 drives the rotary shaft 7 to rotate around the axis through the synchronous pulley 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 via the upper clamp and shaft connector 8, and is arranged along the axial direction of the rotary shaft 7 to fix the upper half of the friction component. 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 component. The thrust spherical bearing 14 is connected to the bottom surface of the lubricating medium storage tank 10 and is fixed by bolts to ensure that the lower half of the friction component is always in a horizontal position, thus ensuring 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 joint bearing 14. The heating plate 12 is a cast aluminum heating plate with temperature control. The heating plate 12 is placed above the heat insulation plate 13 and is fixed and kept in contact with the friction component by applying positive pressure through the force sensor 15.

[0072] In this embodiment, the detection components include 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 connector 21 by bolts. The platform connector 21 is connected to the support 22 by bolts. The bottom of the support 22 is fixed to the base plate 24 by stiffening 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 by bolts and a cylinder. The cylinder and the torque sensor connector 18 are fixed to the guide column lifting cylinder 19 by bolts and are arranged along the axial direction of the rotating shaft 7 to detect the magnitude of the torque value generated by the friction component.

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

[0076] Specifically, the force sensor 15 is connected to the lubricating medium storage pool 10 below. The torque sensor 17 is connected to the force sensor 15 through the sensor connector 16. The torque sensor 17 is also axially arranged and is used to detect the normal pressure applied to the friction parts in real time. The guide column lifting cylinder 19 can drive the force sensor 15 to move axially and adjust the magnitude of the normal pressure.

[0077] Force sensor 15 is a spoke-type load cell, fixed on sensor connector 16, and sensor connector 16 is fixed to torque sensor 17 by bolts.

[0078] The positive pressure detected in real time by force sensor 15 and the torque value detected in real time by torque sensor 17 are then collected by the information acquisition unit 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 cycloidal pump 27, an oil pump motor unit 25, and a tank 26. One end of the oil inlet pipe 28 and the oil outlet pipe 20 are connected to the lubricating medium storage tank 10 via a high-pressure compression fitting 11, and the other end is connected to the cycloidal pump 27 via a pagoda fitting, forming a closed loop. The oil pump motor unit 25 and the tank 26 are arranged on the base plate 24 and connected by bolts. The lubricating medium storage tank 14, together with the oil inlet pipe 28, the oil outlet pipe 20, the cycloidal pump 27, the oil pump motor unit 25, and the tank 26, form a circulation loop.

[0080] Based on the aforementioned rotary friction tester simulating high-temperature lubrication conditions in aviation, this embodiment proposes a rotary friction test method simulating high-temperature lubrication conditions in aviation, including testing the effects of different driving speeds, different normal pressures, different temperatures, or different lubricating media on friction performance. Details are as follows:

[0081] The first group of tests, examining the impact of different driving speeds on frictional performance, was conducted according to the following steps:

[0082] Step a1: Install the upper half of the friction component on the upper clamp 9, and install the lower half of the friction component on the thrust joint bearing 14 of the lubricating medium storage tank 10. Check the integrity of the equipment. Adjust the height by using the guide column lifting cylinder 19 and detect it by using the force sensor 15. After setting the positive pressure to the set value, keep the guide column lifting cylinder 19 stable. Adjust the speed control valve on the circulation loop, turn on the oil pump motor unit 25, and inject the 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 and adjust the temperature of the heating plate using the temperature controller to preheat the friction parts;

[0084] Step a3: Start motor 6 and control motor 6 to speed up to the initial set speed value through motor driver, and record the measurement value of torque sensor 17 at this time;

[0085] Step a4: Adjust the speed of motor 6 to each of the other set speed values ​​one by one using the motor driver, and record the corresponding measurement values ​​of torque sensor 17 one by one;

[0086] Step a5: Complete the first set of tests, and shut down motor 6 and oil pump motor unit 25.

[0087] The second group of tests, examining the effects of different normal pressure conditions on frictional performance, was conducted according to the following steps:

[0088] Step b1: After completing the first set of tests, adjust the guide column lifting cylinder 19 and detect it using the force sensor 15 to reset the positive pressure between the friction parts. Then, power the oil pump motor 25 and inject the 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 and adjust the temperature of the heating plate 12 through the temperature controller to preheat the friction parts;

[0090] Step b3: Start motor 6, control motor 6 to speed up to the set speed value through motor driver, and record the measurement value of torque sensor 17 at this time;

[0091] Step b4: Shut down motor 6 and oil pump motor unit 25;

[0092] Step b5: Adjust the guide column lifting cylinder 19 and detect the force sensor 15 at the same time. Set the normal pressure of the friction part to other set values ​​one by one. Under different normal pressures, refer to steps b1 to b4 to test and record the corresponding torque sensor 17 measurement values.

[0093] Step b6: Complete the second set of tests, and shut down motor 6 and oil pump motor unit 25.

[0094] The third group of tests, examining the impact of different operating temperatures on frictional performance, was conducted according to the following steps:

[0095] Step c1: After completing the second set of tests, adjust the guide column lifting cylinder 19 and detect it using the force sensor 15 to reset the positive pressure between the friction parts. Then, power the oil pump motor 25 and inject the 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 through the temperature controller to the set temperature value, and preheat the friction parts.

[0097] Step c3: Start motor 6, control motor 6 to speed up to the set speed through motor driver, and record the measurement value of torque sensor 17 at this time;

[0098] Step c4: Shut down motor 6 and oil pump motor unit 25;

[0099] Step c5: Adjust the temperature of the heating plate 12 using the temperature controller, and set the temperature to other set values ​​one by one. At different temperatures, test and record the corresponding torque sensor 17 measurement values ​​one by one, referring to steps c1 to c4.

[0100] Step c6: Complete the third set of tests and shut down motor 6 and oil pump motor unit 25.

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

[0102] Step d1: After completing the third set of tests, adjust the guide column lifting cylinder 19 and detect it using the force sensor 15 to reset the positive pressure between the friction parts. Then, power the oil pump motor 25 and inject the 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 through the temperature controller to the set temperature value, and preheat the friction parts.

[0104] Step d3: Start motor 6, control motor 6 to speed up to the set speed through motor driver, and record the measurement value of torque sensor 17 at this time;

[0105] Step d4: Shut down motor 6 and oil pump motor unit 25;

[0106] Step d5: Replace the lubricating medium in the pool (26). Inject different lubricating media into the lubricating medium storage pool 10 through the circulation loop one by one. Under different lubricating media, refer to steps d1 to d4 to test and record the corresponding torque sensor 17 measurement values.

[0107] Step d6: Complete the fourth set of tests and shut down motor 6 and oil pump motor unit 25.

[0108] The above description is only for the purpose of helping to understand the method and core essence of the present invention, but the scope of protection of the present invention is not limited thereto. For those skilled in the art, any equivalent substitutions or modifications made to the technical solution and inventive concept disclosed in the present invention within the scope of the technology disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A rotary friction tester simulating the high temperature lubrication conditions of aviation, characterized in that, The support frame is installed on the bottom plate (24); The driving assembly comprises a motor (6) and a rotating shaft (7), the motor (6) and the rotating shaft (7) are respectively installed on the top of the two sides of the support frame, and the motor (6) drives the rotating shaft (7) to rotate around the axis; The rotating friction assembly comprises an upper clamp (9) and a lubricating medium storage pool (10); The upper clamp (9) is connected to the bottom of the rotating shaft (7) and is used for fixing the upper half of the friction pair; The lubricating medium storage pool (10) is located below the upper clamp (9), the lubricating medium storage pool (10) stores the lubricating circulating medium inside, and the inner bottom surface is connected with a thrust joint bearing (14); a heating assembly is arranged above the thrust joint bearing (14); the lubricating medium storage pool (10) is used for fixing the lower half of the friction pair, and the lower half of the friction pair is always kept horizontal through the thrust joint bearing (14); The detection assembly comprises a force sensor (15), a torque sensor (17) and a guide column jacking cylinder (19); the force sensor (15), the torque sensor (17) and the guide column jacking cylinder (19) are arranged along the axis of the rotating shaft (7) and are sequentially connected from top to bottom, the force sensor (15) is connected below the lubricating medium storage pool (10), and the guide column jacking cylinder (19) is arranged on the bottom plate (24); The guide column jacking cylinder (19) is used for driving the lubricating medium storage pool (10) to displace along the axis, so as to adjust the normal pressure applied to the friction pair; The force sensor (15) is used for detecting the normal pressure value applied to the friction pair in real time, and the detection data is fed back to the signal processing system; The torque sensor (17) is used for detecting the torque value generated by the friction pair when the rotating shaft (7) rotates in real time, and the detection data is fed back to the signal processing system.

2. The rotary friction tester simulating the aeronautical high temperature lubricated conditions according to claim 1, characterized in that, The lubricating medium circulating system is arranged on the bottom plate (24); The lubricating medium circulating system comprises an oil inlet pipe (28), an oil outlet pipe (20), a cycloidal pump (27), an oil pump motor set (25) and a pool body (26); the oil inlet pipe (28) and the oil outlet pipe (20) are connected with the lubricating medium storage pool (10) through high-pressure sleeve joints (11) at one end and are connected with the cycloidal pump (27) through pagoda joints at the other end; the two cycloidal pumps (27) are connected with the two sides of the pool body (26) through connecting pipes and are connected with the oil pump motor set (25); and the oil pump motor set (25) and the pool body (26) are connected on the bottom plate (24) through bolts. The lubricating medium storage pool (10), the oil inlet pipe (28), the oil outlet pipe (20), the cycloidal pump (27) and the pool body (26) form a circulating loop.

3. The rotary friction tester simulating the aeronautical high temperature lubricated conditions according to claim 1, characterized in that, The heating assembly comprises a heating plate (12) and a heat insulation plate (13); the heat insulation plate (13) is arranged above the thrust joint bearing (14), and the heating plate (12) is arranged above the heat insulation plate (13).

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

5. The rotary friction tester simulating the aeronautical high temperature lubricated conditions according to claim 4, characterized in that, The force sensor (15) is connected on the torque sensor (17) through the sensor connecting piece (16), the torque sensor (17) is connected on the guide column jacking cylinder (19) through the cylinder and the torque sensor connecting piece (18); The guide column jacking cylinder (19) is connected with the side plate through the platform connecting piece (21) above, the platform connecting piece (21) is connected with the support (22) on both sides below, and the support (22) is connected with the bottom plate (24) at the bottom.

6. The rotary friction tester simulating the aeronautical high temperature lubricated conditions according to claim 1, 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 method for simulating the high temperature lubricated conditions of aviation by using the rotary friction tester according to any one of claims 1 to 6, characterized in that, The method comprises the following steps: S1, the upper half and the lower half of the friction pair are respectively fixed on the upper clamp (9) and the lubricating medium storage pool (10); the lubricating medium is injected into the lubricating medium storage pool (10) through a circulating loop, and the circulation of the lubricating medium is kept stable; S2, the applied normal pressure and the preheating temperature of the friction pair are kept unchanged, the rotating speed of the motor (6) is adjusted to different rotating speed values in sequence, and the corresponding measurement values of the torque sensor (17) are recorded in sequence; the performance influence of the friction under different driving rotating speeds is tested; S3, the rotating speed of the motor (6) and the preheating temperature of the friction pair are kept unchanged, the applied normal pressure to the friction pair is adjusted to different set values in sequence, and the corresponding measurement values of the torque sensor (17) are recorded in sequence; the performance influence of the friction under different normal pressures is tested; S4, the applied normal pressure and the rotating speed of the motor (6) are kept unchanged, the preheating temperature of the friction pair is adjusted to different set values in sequence, and the corresponding measurement values of the torque sensor (17) are recorded in sequence; the performance influence of the friction under different working temperatures is tested; S5, the applied normal pressure, the rotating speed of the motor (6) and the preheating temperature of the friction pair are kept unchanged, the lubricating medium is replaced to different lubricating media in sequence, and the corresponding measurement values of the torque sensor (17) are recorded in sequence; the performance influence of the friction under different lubricating media is tested.

8. The rotary friction test method simulating an aviation high-temperature lubricated operating condition according to claim 7, characterized in that, The S2 is specifically as follows: S201, the height is adjusted through the guide column jacking cylinder (19) and detected by the force sensor (15), the applied normal pressure is determined as a set value, and the circulation of the lubricating medium is determined to be stable; S202, the temperature of the heating plate (12) is adjusted, and the friction pair is preheated to a set temperature; S203, the rotating speed of the motor (6) is controlled to an initial set rotating speed value, and the measurement value of the torque sensor (17) is recorded; S204, the rotating speed of the motor (6) is adjusted to each set rotating speed value in sequence, and the corresponding measurement value of the torque sensor (17) is recorded in sequence; S205, the performance influence test of the friction under different driving rotating speeds is completed, and the motor (6) and the oil pump motor set (25) are turned off.

9. The rotary friction test method simulating an aviation high temperature lubricated operating condition according to claim 7, characterized in that, The S3 is specifically as follows: S301, adjust the height by the guide column jacking cylinder (19) and detect by the force sensor (15), determine the applied positive pressure as the initial set value, and determine that the lubricating medium circulation is stable; S302, adjust the temperature of the heating plate (12), and preheat the friction pair to the set temperature; S303, control the motor (6) to increase the speed to the set speed value, and record the measured value of the torque sensor (17); S304, stop the motor (6) and the oil pump motor group (25); S305, adjust the applied positive pressure to other set values, cycle S301-S304, and record the corresponding measured values of the torque sensor (17) in sequence, to complete the performance influence test of friction under different positive pressures.

10. The rotary friction test method simulating an aviation high temperature lubricated operating condition according to claim 7, characterized in that, The S4 is specifically as follows: S401, adjust the height by the guide column jacking cylinder (19) and detect by the force sensor (15), determine the applied positive pressure as the set value, and determine that the lubricating medium circulation is stable; S402, adjust the temperature of the heating plate (12), and preheat the friction pair to the initial set temperature; S403, control the motor (6) to increase the speed to the set speed value, and record the measured value of the torque sensor (17); S404, stop the motor (6) and the oil pump motor group (25); S405, adjust the preheating temperature to other set values, cycle S401-S404, and record the corresponding measured values of the torque sensor (17) in sequence, to complete the performance influence test of friction under different working temperatures.

Images