Aging simulation test device of lubricating grease under coupling of thermal field and force field and application thereof

Abstract

The application discloses a kind of grease aging simulation test devices under the coupling of thermal field-force field and application thereof, the device includes: driving motor box, driving shaft, lifting platform and simulation bearing mechanical shearing part, grease filling cylinder is equipped in simulation bearing mechanical shearing part, retainer, steel ball rolling body and loading piston are equipped in grease filling cylinder;Torque sensor is connected with simulation bearing mechanical shearing part, measures real-time torque, characterizes the aging state of lubricating material after mechanical shearing.This application solves the problems that the prior art test method and test condition are single, the specificity is poor, and the grease filling assembly process is complicated, and the lubricating grease participating in friction on bearing after test is difficult to extract.This application is used to simulate the working form of bearing operation process, forms the temperature control system of bearing mechanical shearing part, simulates the working condition environment of bearing actual service, and reflects the continuous evolution process of lubricating grease in the dynamic coupling state of force field and temperature field through torque data change.

Description

TECHNICAL FIELD

[0001] The present application relates to a lubricating grease test device, in particular to a lubricating grease aging simulation test device under the coupling action of thermal field and force field and application thereof. BACKGROUND

[0002] Lubricating grease is a complex semi-solid non-Newtonian fluid composed of thickening agent, base oil and additives. Due to its good lubrication durability and sealing characteristics, it is widely used in various rolling bearings and mechanical equipment. The mechanical shear of lubricating grease during the operation of rolling bearings will cause the mechanical degradation and rheological property change of lubricating grease. Friction heat and radiation heat will cause the change of lubricating grease molecular structure and the change of chemical properties. Under the combined action of mechanical shear force, friction heat and environmental temperature, the base oil of lubricating grease changes, the fiber structure of thickening agent changes, aging occurs, the product thins out and loses, and finally the surface lubrication of friction pair fails.

[0003] In the research and development stage of lubricating grease in the bearing field, how to simulate the coupling conditions of force field and temperature field under specific working conditions in the laboratory, study the shear resistance performance and aging process of lubricating grease, and how to define the service life of lubricating grease have become an urgent problem to be solved. Mechanical stability, also known as shear stability, is used to measure the ability of lubricating grease to resist viscosity change under certain mechanical shear. There are mature methods and equipment on the market to test, and corresponding industry standards or national standards are derived. The existing high-temperature roller tester: according to the Chinese Petroleum Chemical Industry Standard SH / T0122-1992, 50g of unused lubricating grease is evenly filled into a steel cylinder at room temperature, then placed on a rolling frame, and rotated at a speed of 165r / min for 2h, and finally the working cone penetration of the lubricating grease is measured. When performing non-standard test, the steel cylinder can be heated to achieve the purpose of accelerating the aging of lubricating grease; the working principle of the whole device is to use the pressure and friction force generated by the rolling cylinder with a free motion mass of 5kg in the steel cylinder and the steel wall to produce mechanical shear on the lubricating grease. The existing lubricating grease ten-thousand times shear tester: the working principle is that the piston with a thickness of 4.8mm and multiple through holes with a diameter of 6.5mm is moved up and down, extruding the lubricating grease in the lubricating grease working cup, so that the lubricating grease constantly flows through the piston through hole, and the lubricating grease is subjected to mechanical shear; according to the provisions of the national standard GB / T269-2023, an appropriate amount of lubricating grease is filled into the lubricating grease working cup, and under room temperature conditions, the working cone penetration requires the piston to shear 60 times back and forth, and the working cone penetration requires the piston to shear ten thousand times back and forth.

[0004] The prior art has universality and standardization as a testing means for greases, but the test methods and test conditions of the above-mentioned high-temperature roller testing machine and the million times shearing testing machine are single and poor in pertinence as a device for laboratory research on mechanical shearing of greases. In the field of bearings, there is no device that can simulate the service working condition environment of bearings. If the grease is directly tested on a bearing testing machine, firstly, the grease filling and assembly process is complicated, and secondly, the amount of grease added to part of the small and medium-sized bearings is small, and it is difficult to extract the grease involved in friction on the bearing after the test is completed. SUMMARY

[0005] The purpose of the present application is to provide a grease aging simulation test device under the action of thermal field-force field coupling and its application, which solves the problems of single test method and test condition, poor pertinence, complicated grease filling and assembly process, and difficulty in extracting the grease involved in friction on part of the small and medium-sized bearings after the test is completed.

[0006] In order to achieve the above-mentioned purpose, the present application provides a grease aging simulation test device under the action of thermal field-force field coupling, which comprises: a lifting platform arranged at the center of a working platform; a simulated bearing mechanical shearing component movably arranged on the upper end surface of the lifting platform, which is internally provided with a grease filling cylinder, a retainer, a steel ball rolling body and a loading piston are arranged in the interior of the grease filling cylinder; the retainer comprises an upper disc and a lower disc, wherein the upper disc and the lower disc are both symmetrically provided with holes, and the hole diameter is smaller than the diameter of the steel ball rolling body, and the positions and sizes of the holes of the upper disc and the lower disc correspond respectively; the steel ball rolling body is movably limited in the grease filling cylinder through the upper disc and the lower disc of the retainer, and the steel ball rolling body and the retainer movably contact, the form of the contact is linear contact; the loading piston is movably contacted above the steel ball rolling body, the form of the contact is point contact, and the grease filling cylinder is assembled in a clearance fit with the loading piston, so that the loading piston can rotate in the grease filling cylinder; a drive motor box is fixed above the simulated bearing mechanical shearing component through support columns fixed vertically and symmetrically at the edge of the platform; a drive shaft is fixedly connected with the output end of the lower end of the drive motor box at the upper end, and the bottom surface of the lower end is provided with a buckle part matched with the upper end surface of the loading piston, the rotation of the drive shaft is driven by the output end of the lower end of the drive motor box to drive the rotation of the loading piston; a torque sensor is connected with the simulated bearing mechanical shearing component, which is used for measuring real-time torque to characterize the aging state of the lubricating material after mechanical shearing.

[0007] Preferably, the simulated bearing mechanical shearing component further comprises a water bath shell and a bottom support, the cross section of the water bath shell is C-shaped structure, the bottom is fixedly connected with the bottom support, the interior is installed with the grease filling cylinder through interference fit, and the gap between the water bath shell and the grease filling cylinder is sealed to form an annular closed cavity.

[0008] Preferably, the simulated bearing mechanical shearing component further comprises an upper end cover, an electric heating tube, a temperature sensor socket and a cooling water quick plug interface; the electric heating tube is uniformly fixed on the lower end surface of the grease filling cylinder; the temperature sensor socket is provided through the upper end cover and is used for external connection of a temperature sensor.

[0009] Preferably, the cooling water quick plug interface is symmetrically arranged on the side wall of the water bath shell and is used for connecting a cooling device, so that cooling water in the cooling device enters the annular closed cavity through the cooling water quick plug interface to achieve a cooling effect and forms a temperature control system of the simulated bearing mechanical shearing component together with the electric heating tube, and the temperature of the simulated bearing mechanical shearing component is regulated through the temperature sensor inserted in the temperature sensor socket, so as to simulate the actual service working condition environment of the bearing.

[0010] Preferably, a heat preservation layer for heat insulation is arranged between the grease filling cylinder and the bottom support.

[0011] Preferably, the simulated bearing mechanical shearing component further comprises a handle and a hook, and the bottom support is integrally formed with the handle and the hook and is arranged at the bottom of the simulated bearing mechanical shearing component; the hook is connected with a pull ring of the torque sensor and is used for measuring a real-time torque.

[0012] Preferably, the simulated bearing mechanical shearing component further comprises a thrust ball bearing, and a movable upper gasket of the thrust ball bearing is fixed in a circular groove on the lower bottom surface of the bottom support through interference fit, and a movable lower gasket of the thrust ball bearing is fixed on the upper end surface of the shaft neck of the lifting platform through interference fit.

[0013] Preferably, the clamping part of the buckle part is arranged on the lower end surface of the driving shaft, the fastening part of the buckle part is arranged on the upper end surface of the loading piston, and when the clamping part and the fastening part are connected, the output end of the lower end of the driving motor box drives the loading piston to rotate through the driving driving shaft.

[0014] Preferably, the fastening part is a double square key groove, and the clamping part is a key matched with the double square key groove.

[0015] The lubricating grease aging simulation test device under the coupling action of a thermal field and a force field and the application thereof solve the problems of single test method and test condition, poor pertinence, complicated grease filling and assembly process and difficulty in extracting the lubricating grease participating in friction on the bearing after the test is completed, and have the following advantages:

[0016] 1. The simulated bearing mechanical shearing component is internally provided with a grease filling cylinder, a retainer, a steel ball rolling body and a loading piston are arranged in the grease filling cylinder, and when the motor drives the driving shaft to drive the loading piston to rotate, the steel ball rolling body and the retainer rotate in the grease filling cylinder under the action of friction, so that rolling friction and sliding friction exist, and the working form of the bearing during operation is simulated.

[0017] 2、The annular closed cavity and the electric heating tube of the present application constitute a temperature control system of the simulated bearing mechanical shearing component, and the temperature of the simulated bearing mechanical shearing component is regulated by the temperature sensor inserted into the temperature sensor insertion hole, so that the actual service working condition environment of the simulated bearing is simulated.

[0018] 3、The torque sensor of the present application reflects the continuous evolution process of the grease in the dynamic coupling state of the force field and the temperature field through the change of the torque data, and the movable upper end cover, the loading piston, the steel ball rolling body and the retainer not only solve the problem of small grease filling amount of part of the bearing, but also solve the problem of difficult extraction of the grease participating in friction on the bearing after the test is completed. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of the grease aging simulation test device of the present application.

[0020] Figure 2 It is a cross-sectional view of the simulated bearing mechanical shearing component of the present application.

[0021] Figure 3 It is a three-dimensional schematic diagram of the simulated bearing mechanical shearing component (1) of the present application.

[0022] Figure 4 It is a schematic diagram of the steel ball rolling body and the retainer of the present application.

[0023] Figure 5 It is a three-dimensional schematic diagram of the simulated bearing mechanical shearing component (2) of the present application.

[0024] Figure 6 It is a state diagram of the sheared grease in the device of the present application.

[0025] Figure 7 It is a trend diagram of the change of the penetration of the sheared grease in the device of the present application.

[0026] Figure 8 It is a SEM diagram of the change of the microstructure of the sheared grease in the device of the present application.

[0027] Note: 1, drive motor box; 2, drive shaft; 3, simulated bearing mechanical shearing component; 4, lifting platform; 5, torque sensor; 6, water bath shell; 7, upper end cover; 8, loading piston; 9, steel ball rolling body; 10, retainer; 11, bottom support; 12, grease filling cylinder; 13, electric heating tube; 14, thrust ball bearing; 15, temperature sensor insertion hole; 16, handle; 17, cooling water quick plug interface; 18, hook and 19, thermal insulation layer. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0029] The manufacturers, models and specifications of the parts involved in the following embodiments are as follows:

[0030] The universal friction testing machine comprises a driving motor box 1, a driving shaft 2, a lifting platform 4 with an embedded pressure sensor, and a temperature sensor purchased from Jinan Shunma Testing Instrument Co., Ltd. and having a model of MMW-10.

[0031] The torque sensor is purchased from Beijing Shitong Keji Technology Co., Ltd. and has a model of TQ-664.

[0032] Embodiment 1

[0033] A lubricating grease aging simulation test device under the coupling action of a thermal field and a force field, as shown in Figures 1-3 FIG. 1 is a schematic diagram of the lubricating grease aging simulation test device of the present application. The device comprises a driving motor box 1, a driving shaft 2, a simulated bearing mechanical shearing component 3, a lifting platform 4 and a torque sensor 5.

[0034] The lifting platform 4 is located at the central part of the working platform of the device, and vertical fixed support columns are symmetrically distributed at the edges of the platform for supporting the driving motor box 1. The simulated bearing mechanical shearing component 3 is mounted on the upper end face journal of the lifting platform 4 through a thrust ball bearing 14. The upper end of the driving shaft 2 is connected with a motor in the driving motor box 1 to provide driving force, and the lower end of the driving shaft 2 is provided with a key matched with the key groove at the upper end of the loading piston 8 of the simulated bearing mechanical shearing component 3. When the key at the lower end of the driving shaft 2 is inserted into the key groove at the upper end of the loading piston 8, the motor can drive the loading piston 8 to rotate through the driving shaft 2. The pull ring of the torque sensor 5 is connected with the hook 18 of the simulated bearing mechanical shearing component 3 for measuring the real-time torque to represent the aging state of the lubricating material after mechanical shearing. The height of the torque sensor 5 is fixed and does not change with the lifting of the lifting platform 4. A pressure sensor is arranged in the lifting platform 4 for detecting and controlling the pressure of the loading piston 8 acting on the steel ball rolling body 9. The lifting distance of the lifting platform 4 is equal to the difference between the height of the device and the height of the driving shaft 2 and the height of the simulated bearing mechanical shearing component 3.

[0035] The simulation bearing mechanical shearing component 3 comprises a water bath shell 6, an upper end cover 7, a loading piston 8, steel ball rolling bodies 9, a retainer 10, a bottom support 11, a grease filling cylinder 12, an electric heating tube 13, a thrust ball bearing 14, a temperature sensor insertion hole 15, a handle 16, a cooling water quick plug interface 17, a hook 18 and a thermal insulation layer 19. The bottom support 11 is integrally formed with the handle 16 and the hook 18 and is arranged at the bottom of the simulation bearing mechanical shearing component 3. The movable upper gasket of the thrust ball bearing 14 is fixed in the lower bottom surface circular groove of the bottom support 11 by interference fit, the movable lower gasket of the thrust ball bearing 14 is fixed on the upper end surface journal of the lifting platform 4 by interference fit, and the simulation bearing mechanical shearing component 3 is installed on the lifting platform 4 through the thrust ball bearing 14. The electric heating tube 13 is uniformly fixed in the lower end surface circular groove of the grease filling cylinder 12 and is provided with the thermal insulation layer 19 for heat insulation between the bottom support 11. The circular water bath shell 6 has a C-shaped structure in cross section, the bottom thereof is fixedly connected to the bottom support 11 through four bolts, the grease filling cylinder 12 is installed in the circular water bath shell 6 in a manner of interference fit, and the gap between the circular water bath shell 6 and the grease filling cylinder 12 is sealed by welding to form an annular closed cavity. The retainer 10 comprises an upper disc and a lower disc, a plurality of holes are symmetrically arranged on the upper disc and the lower disc, the hole diameter is smaller than the diameter of the steel ball rolling bodies 9, and the position and size of each hole of the upper disc and the lower disc are corresponding respectively. The steel ball rolling bodies 9 are symmetrically and uniformly movably limited in the grease filling cylinder 12 through the upper disc and the lower disc of the retainer 10, and the steel ball rolling bodies 9 and the retainer 10 are movably connected therebetween, the contact forms are similar to those of a bearing, and are point contact and line contact. The loading piston 8 is arranged in the grease filling cylinder 12 and is located above the steel ball rolling bodies 9, the loading piston 8 and the grease filling cylinder 12 are assembled in a manner of clearance fit to ensure that the loading piston 8 can rotate in the grease filling cylinder 12. The upper end cover 7 is movably arranged on the grease filling cylinder 12 in a threaded manner and has a gap between the loading piston 8 to ensure that the loading piston 8 is not affected when rotating. The temperature sensor insertion hole 15 is arranged through the upper end cover 7 and is used for connecting an external temperature sensor, and the cooling water quick plug interface 17 is symmetrically arranged on the side wall of the water bath shell 6 and is used for connecting an external cooling device, so that the cooling water in the cooling device enters the annular closed cavity through the cooling water quick plug interface 17 to achieve a cooling effect, and forms a temperature control system of the simulation bearing mechanical shearing component 3 together with the electric heating tube 13, the temperature of the simulation bearing mechanical shearing component 3 is controlled as a whole through the temperature sensor inserted in the temperature sensor insertion hole 15, and the actual service working condition environment of the bearing is simulated. The driving motor box 1, the lifting platform 4, the electric heating tube 13 and the external cooling device are used for setting the working program. The assembled simulation bearing mechanical shearing component 3 is installed on the lifting platform 4 as a whole, the handle 16 faces outward, and the hook 18 is connected to the pull ring of the torque sensor 5.

[0036] The grease aging simulation test device, based on a universal tribometer and coupled thermal and force fields, simulates the aging process of grease in actual bearing service, where mechanical shear occurs between the rolling elements and the inner and outer raceways, and between the friction pairs of the steel ball rolling element 9 and the retainer 10. This device is primarily used in laboratories during the development of lubricating products to study the mechanical stability of grease and estimate its service life. The following further explains the grease aging simulation test device, coupled with its operating principle:

[0037] When filling grease, unscrew the upper end cover 7, take out the loading piston 8, steel ball rolling element 9 and retainer 10, evenly apply about 5mL of grease to the bottom of the grease filling cylinder 12, insert the lower plate of the retainer 10 and the steel ball rolling element 9, then evenly fill about 25mL of grease into the gap between the grease filling cylinder 12 and the steel ball rolling element 9, then insert the upper plate of the retainer 10, and finally insert the loading piston 8, and tighten the upper end cover 7.

[0038] During operation, the lifting platform 4 raises the simulated bearing mechanical shearing component 3 until the key at the lower end of the drive shaft 2 is inserted into the keyway at the upper end of the loading piston 8. At this time, the pressure sensor built into the lifting platform 4 can control the magnitude of the positive pressure applied to the steel ball rolling element 9 during operation. When the motor drives the drive shaft 2 to rotate the loading piston 8, the steel ball rolling element 9 and the retaining frame 10 rotate within the grease filling cylinder 12 under the action of friction. Because they are not fixed to each other, the steel ball rolling element 9 experiences both rolling friction and sliding friction relative to the loading piston 8 and retaining frame 10. Therefore, the stirring and shearing effects on the grease during this process are the same as those during the operation of the bearing. The entire simulated bearing mechanical shearing component 3 is mounted on the lifting platform 4 via a thrust ball bearing 14. The driving torque of the thrust ball bearing 14 is very small and can be ignored. The torque of the grease during the stirring process can be measured by the torque sensor 5. By monitoring the real-time changes in torque, dynamic perception of the grease aging evolution process is achieved.

[0039] Example 2 Experiments were conducted to verify the feasibility of the device of the present invention.

[0040] 25 g of 2# lithium-based grease was added to the device of Example 1 of the present invention, and the device was run under the test conditions of room temperature, 500 N and 400 r / min for 0 h, 2 h, 5 h, 10 h, 15 h and 20 h respectively. After the test, the change in the cone penetration of the grease was tested.

[0041] like Figure 6 As shown, this is a diagram of the shear grease state in the device of the present invention.

[0042] like Figure 7 As shown in FIG. 1 , the trend diagram of the change of the shear grease cone penetration in the device of the present invention. Figure 7It can be seen that the longer the shearing time, the larger the cone penetration value, which means that the hardness decreases more obviously.

[0043] like Figure 8 As shown in FIG, the SEM image of the microstructure change of the shear grease in the device of the present invention. Figure 8 It can be seen that the longer the shearing time, the more obvious the breakage of the grease soap fibers and the shorter the fiber length. This shows that the essential reason for the softening of the grease is that as the shearing time increases, the soap fibers formed by the thickener are broken by the shear force, and the binding capacity of the base oil decreases. Therefore, the device of Example 1 of the present invention is obvious in simulating the shearing process of grease.

[0044] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description is not intended to limit the present invention. After reading the above description, various modifications and substitutions of the present invention will become apparent to those skilled in the art. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A grease aging simulation test device under thermal field-force coupling, characterized by, The device comprises: a lifting platform (4) arranged at the center of the working platform; a simulated bearing mechanical shearing component (3) movably arranged on the upper end surface of the lifting platform (4), and internally provided with a grease filling cylinder (12), a retainer (10), a steel ball rolling body (9) and a loading piston (8) arranged in the grease filling cylinder (12); the retainer (10) comprises an upper disc and a lower disc, wherein the upper disc and the lower disc are symmetrically provided with holes, and the diameters of the holes are smaller than the diameter of the steel ball rolling body (9), and the positions and sizes of the holes of the upper disc and the lower disc correspond to each other respectively; the steel ball rolling body (9) is movably limited in the grease filling cylinder (12) by the upper disc and the lower disc of the retainer (10), and the steel ball rolling body (9) and the retainer (10) movably contact each other, and the contact is in the form of line contact; the loading piston (8) movably contacts the upper part of the steel ball rolling body (9), and the contact is in the form of point contact, and the grease filling cylinder (12) is assembled in a clearance fit mode with the loading piston (8) for enabling the loading piston (8) to rotate in the grease filling cylinder (12); a driving motor box (1) is fixed above the simulated bearing mechanical shearing component (3) through support columns fixedly arranged on the platform periphery in vertical symmetry; a driving shaft (2) has its upper end fixedly connected with the output end of the lower end of the driving motor box (1), and has its lower end bottom surface provided with a buckle member matched with the upper end surface of the loading piston (8), and the rotation of the driving shaft (2) is driven by the output end of the lower end of the driving motor box (1) to drive the rotation of the loading piston (8); a torque sensor (5) is connected with the simulated bearing mechanical shearing component (3) for measuring real-time torque to represent the aging state of the lubricating material after mechanical shearing.

2. The grease aging test apparatus under the coupling of thermal field and force field according to claim 1, characterized in that, The simulated bearing mechanical shearing component (3) further comprises a water bath shell (6) and a bottom support (11), the cross section of the water bath shell (6) is in the form of C-shaped structure, the bottom thereof is fixedly connected with the bottom support (11), the grease filling cylinder (12) is installed in the water bath shell (6) through interference fit, and the gap between the water bath shell (6) and the grease filling cylinder (12) is sealed to form an annular closed cavity.

3. The grease aging test apparatus under the coupling of thermal field and force field according to claim 2, characterized in that, The simulated bearing mechanical shearing component (3) further comprises an upper end cover (7), an electric heating tube (13), a temperature sensor insertion hole (15) and a cooling water quick insertion interface (17), the electric heating tube (13) is uniformly fixed on the lower end surface of the grease filling cylinder (12), and the temperature sensor insertion hole (15) is arranged through the upper end cover (7) for externally connecting a temperature sensor.

4. The grease aging test apparatus under the coupling of thermal field and force field according to claim 3, characterized by, The cooling water quick insertion interface (17) is symmetrically arranged on the side wall of the water bath shell (6) for connecting a cooling device, so that the cooling water in the cooling device enters the annular closed cavity through the cooling water quick insertion interface (17) to achieve a cooling effect, and forms a temperature control system of the simulated bearing mechanical shearing component (3) together with the electric heating tube (13), the temperature of the simulated bearing mechanical shearing component (3) is adjusted by the temperature sensor inserted in the temperature sensor insertion hole (15), and the simulated bearing mechanical shearing component (3) is used to simulate the actual service working condition environment of the bearing.

5. The grease aging test apparatus under the coupling of thermal field and force field according to claim 3, characterized in that, A heat preservation layer (19) for heat insulation is arranged between the grease filling cylinder (12) and the bottom support (11).

6. The grease aging test apparatus under the coupling of thermal field and force field according to claim 3, characterized in that, The analog bearing mechanical shearing component (3) further comprises a handle (16) and a hook (18), the bottom support (11) is integrally formed with the handle (16) and the hook (18) and is arranged at the bottom of the analog bearing mechanical shearing component (3); the hook (18) is connected with the pull ring of the torque sensor (5) and is used for measuring real-time torque.

7. The grease aging test apparatus under the coupling of thermal field and force field according to claim 3, characterized by, The analog bearing mechanical shearing component (3) further comprises a thrust ball bearing (14), a movable upper gasket of the thrust ball bearing (14) is fixed in a lower bottom surface circular groove of the bottom support (11) through interference fit, and the movable lower gasket of the thrust ball bearing (14) is fixed on the upper end surface journal of the lifting platform (4) through interference fit.

8. The grease aging test apparatus under thermal field-force coupling according to claim 1, characterized by, The clamping part of the buckle part is arranged on the lower end surface of the driving shaft (2), the buckle part of the buckle part is arranged on the upper end surface of the loading piston (8), when the clamping part and the buckle part are connected, the output end of the lower end of the driving motor box (1) drives the loading piston (8) to rotate through the driving driving shaft (2).

9. The grease aging test apparatus under the coupling of thermal field and force field according to claim 8, characterized in that, The buckle part is a double-headed key groove, and the clamping part is a key matched with the double-headed key groove.

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