Sliding bearing extreme condition simulation test device

Abstract

The invention discloses a sliding bearing extreme condition simulation test device, and relates to the field of sliding bearing performance testing. Comprising a test shaft sleeve assembly, a magnetic field excitation assembly, a thermal test bearing bush assembly, a test cavity assembly and a static force loading assembly. The outer circular surface and the inner circular surface of the magnetic field excitation assembly are respectively matched with the test cavity assembly and the thermal test bearing bush assembly to form a combined body, the static force loading assembly applies load and displacement to the combined body to change a gap between a test bearing bush and a test shaft sleeve so as to achieve the purpose of applying an extreme load to a test bearing, and meanwhile, the static force loading assembly is used for loading the test bearing bush and the test shaft sleeve. The test shaft sleeve assembly can effectively inhibit bending deformation of the cantilever rotating shaft under heavy load. Through cooperation with an external device, active simulation of coupling working conditions such as rotating speed, load, electromagnetic field, local high temperature and the like can be carried out, and a special simulation test of the sliding bearing under various abnormal extreme working conditions is realized.

Description

Technical Field

[0001] The present invention relates to the field of sliding bearing performance testing, and in particular to a sliding bearing extreme working condition simulation test device. Background Art

[0002] In the power generation sector, the gearbox of a doubly-fed and semi-direct-drive wind turbine is directly connected to the generator. Under new technology development paths, the gearbox shafting will be partially supported by sliding bearings. Due to the characteristics of low-speed, heavy-load, and variable-speed and load conditions, sliding bearings are highly susceptible to wear. This can lead to the presence of small, electromagnetically sensitive metal particles in the lubricant. The electromagnetic field surrounding the generator affects the distribution of these metal particles and other lubricant additives on the bearing working surface, significantly impacting the bearing's lubrication performance. Furthermore, the coupled effects of speed, load, and wear can easily lead to extremely high temperatures on the bearing working surface, causing creep deformation, adhesion, and even melting of the bearing metal surface. These extreme operating conditions can accelerate bearing failure. Existing technical research on sliding bearings primarily focuses on the effects of load, speed, and lubricant on bearing lubrication performance under design parameters. Limited research has been conducted on extreme operating conditions that accelerate bearing life loss during service, such as electromagnetic fields, localized high temperatures, and extreme loads. These studies have only addressed single factors within the bearing material framework, but have not examined the multi-factor coupling of extreme operating conditions from the perspective of sliding bearings. This is primarily due to limitations in research equipment and a lack of urgency. In recent years, China has placed high demands on the reliability and lifespan prediction of high-end equipment, necessitating attention to factors affecting bearing life loss due to extreme operating conditions beyond standard operating conditions. High-power, large wind turbines require gearboxes to be designed for a 20-year service life onshore and 25-year service life at sea, necessitating research into the impact of these extreme operating conditions on the performance of gearbox bearings.

[0003] Therefore, it is urgent to develop a sliding bearing test device that simulates extreme working conditions such as electromagnetic, high temperature and load coupling, and study the impact of extreme working conditions such as thermal-mechanical-magnetic coupling on the service reliability and life of sliding bearings. Summary of the Invention

[0004] In view of the above situation, in order to overcome the defects of the existing technology, the present invention provides a sliding bearing extreme working condition simulation test device realized by thermal-mechanical-magnetic active control, which can realize the bearing interface simulation test of the sliding bearing under one or more extreme working conditions such as electromagnetic field environment, local overheating of the bearing shell and extreme overload, and realize the performance evolution characteristics and life study of the bearing service interface under abnormal extreme working conditions.

[0005] To achieve the above-mentioned purpose, the present invention provides a sliding bearing extreme working condition simulation test device, including: a test sleeve assembly, a magnetic field excitation assembly, a thermal test bearing assembly, a test cavity assembly and a static force loading assembly; the test cavity assembly serves as a bearing seat for the test bearing and directly bears the external static load generated by the static force loading assembly, the test sleeve assembly serves as a moving part of the bearing test to suppress the bending deformation of the cantilever shaft under heavy load, the thermal test bearing assembly serves as a static part of the bearing test to provide a temperature-controllable local high-temperature environment for the bearing test, the magnetic field excitation assembly is used to provide a magnetic field environment with controllable magnetic field strength for the bearing test, and the static force loading assembly is used to provide an extreme load environment with controllable load for the bearing test.

[0006] Furthermore, the test sleeve assembly includes a cantilever shaft, a load-bearing ring, a test sleeve, a positioning pin, an elastic retaining ring and a locking nut; the load-bearing ring is mounted on the cantilever shaft and is axially positioned by a shoulder on the cantilever shaft; the test sleeve is mounted on the cantilever shaft and is axially positioned by a shoulder on the cantilever shaft; a gap is left between the outer cylindrical surface and the inner cylindrical surface of the load-bearing ring and the inner cylindrical surface of the test sleeve and the outer cylindrical surface of the cantilever shaft respectively; the positioning pin passes through the radial pin holes on the test sleeve and the cantilever shaft to prevent the test sleeve from generating circumferential rotational motion relative to the cantilever shaft, and the elastic retaining ring is mounted in the groove of the test sleeve to prevent the positioning pin from falling; the locking nut is mounted on the shaft end thread of the cantilever shaft to limit the axial displacement of the test sleeve relative to the cantilever shaft.

[0007] Furthermore, the magnetic field excitation assembly includes a magnetic inner ring, thermal insulation cotton, an electromagnetic coil, an upper magnetic outer ring, a lower magnetic outer ring, connecting bolts and an external control power supply; the magnetic inner ring is integral, the thermal insulation cotton is attached to the outer circular groove of the magnetic inner ring, and the electromagnetic coil is tightly wound on the thermal insulation cotton in multiple layers; the upper magnetic outer ring and the lower magnetic outer ring respectively cooperate with the stepped grooves on the outer circular edge of the magnetic inner ring through the stepped grooves on the inner circular edges and are connected through the connecting bolts, so that the electromagnetic coil is sealed in the cavity formed by the upper magnetic outer ring and the lower magnetic outer ring and the magnetic inner ring; the input and output wires of the electromagnetic coil are simultaneously passed through the small holes machined on the upper magnetic outer ring and connected to the external control power supply; the inner surface of the magnetic inner ring is machined with a circular boss for installing and positioning the test bearing; the outer circular surfaces of the upper magnetic outer ring and the lower magnetic outer ring are machined with grooves, which will cooperate with the inner circular bosses of the upper cavity and the lower cavity of the test cavity assembly to achieve positioning and assembly.

[0008] Furthermore, the thermal test bearing assembly includes a test bearing, an end face locating pin, a first connecting screw, an oil supply pipe and a heating rod for realizing local high-temperature thermal control; the test bearing is an integral circular bearing, the outer circle of the test bearing is processed with a shoulder boss, and the end face is processed with a pin hole, a threaded hole, an oil inlet hole and a heating hole; the outer circle shoulder boss of the test bearing cooperates with the circular boss on the inner surface of the magnetic inner ring, and the circumferential positioning of the test bearing and the magnetic inner ring is realized by the end face locating pin, and the test bearing is fixed to the magnetic inner ring by the first connecting screw; the oil inlet hole on the end face of the test bearing is connected to the oil supply pipe to realize oil supply and lubrication of the test bearing; the heating rod is installed in the heating hole on the end face of the test bearing.

[0009] Furthermore, the test cavity assembly is an upper and lower split cavity structure, including an upper cavity, a lower cavity, a fastening bolt connecting the upper cavity and the lower cavity, an end cover for sealing the end surface of the upper cavity and the lower cavity after combination, a sealing gasket and a second connecting screw, as well as a return oil pipe and a circumferential positioning pin; the inner circular surfaces of the upper cavity and the lower cavity are processed with bosses, which respectively cooperate with the outer circular grooves of the upper magnetic outer ring and the lower magnetic outer ring, and the circumferential positioning and constraint of the magnetic field excitation assembly are achieved by the circumferential positioning pin passing through the inner hole of the upper cavity; two pin holes are opened at both ends of the upper cavity, which will be connected to the static force loading assembly through two connecting pins to realize the simulation of load force; an oil hole is opened on the bottom side of the lower cavity, and the return oil pipe is installed to realize the circulation of lubricating oil inside the test cavity assembly.

[0010] Furthermore, the static force loading assembly is a four-bar linkage, which is connected to the upper cavity of the test cavity assembly through two connecting pins. The external force-applying device applies tension or pressure to the test cavity assembly through the static force loading assembly and generates an upward or downward displacement, thereby changing the oil film gap between the test bearing and the test sleeve installed inside the test cavity assembly, thereby realizing loading force simulation of the test bearing.

[0011] Furthermore, during operation, the cantilever shaft is driven to rotate by an external motor system, so that relative movement is generated between the test sleeve and the test bearing, thereby achieving the purpose of simulating the rotational speed; the external load applying device changes the oil film gap between the test bearing and the test sleeve through the static force loading component, thereby achieving the purpose of applying a simulated load to the test bearing; the external AC or DC power supply changes the magnetic field type and size of the electromagnetic coil, thereby achieving the purpose of applying an electromagnetic field to the test bearing; the external power supply controls the temperature of the heating rod, thereby achieving the purpose of applying a high temperature to the test bearing.

[0012] Compared with the prior art, the present invention has the following beneficial technical effects:

[0013] In power generation equipment, the electromagnetic field in the generator can affect the lubrication properties of the surrounding supporting sliding bearings to varying degrees. This is primarily due to metallic abrasive particles and lubricant additives. Contact wear particles caused by poor lubrication can exacerbate the electromagnetic field's impact on the bearing's lubrication properties. Furthermore, high speeds, heavy loads, and contact wear can easily lead to extremely high temperatures locally on the bearing's working surface, causing creep deformation, adhesion, or even melting of the bearing's metal surface, disrupting the bearing's continuous wedge clearance and lubrication properties. These extreme operating conditions can accelerate bearing failure. Existing technologies for sliding bearings have limited research on extreme operating conditions that accelerate bearing life loss during service, such as electromagnetic fields and localized high temperatures. While it is generally assumed that properly shielded electromagnetic coils will not significantly affect bearings, electromagnetic fields are a common and unavoidable cause of bearing damage. Studies of the impact of bearing temperature typically use speed and load as the control. However, these temperatures, generated by fluid lubrication, are relatively low and difficult to reach, as they are often at the higher temperatures caused by various factors during long-term bearing service. This makes it difficult to effectively study the impact of localized high temperatures on bearing performance degradation.

[0014] With the significant increase in service reliability and service life requirements for equipment, such as high-power large-scale wind turbine and steam turbine generator bearings, the service life of sliding bearings needs to be predicted. This requires focusing on studying extreme working conditions outside of general working conditions and the factors that accelerate bearing life loss. The present invention proposes a sliding bearing extreme working condition simulation test device implemented by thermal-mechanical-magnetic active control. The static force loading component is used to simulate the application of extreme load forces to the sliding bearing to support the study of the impact of wide load changes on the bearing lubrication performance; the magnetic field excitation component is used to control the electromagnetic field intensity on the bearing working surface to support the study of the impact of electromagnetic field intensity and direction on the bearing interface lubrication performance; and the heating rod is used to apply local high temperature to the sliding bearing to support the study of the impact of local high temperature on the metal properties of the bearing interface and the bearing lubrication performance. By simulating multiple coupled extreme working conditions such as electromagnetic, high temperature and load, the typical characteristics and evolution laws of wear, lubrication, load and other aspects of the sliding bearing during the accelerated failure process are studied, providing experimental data and models for the service reliability and life prediction of the sliding bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is an assembly diagram of a sliding bearing extreme working condition simulation test device according to the present invention;

[0017] Figure 2 This is an exploded view of parts of a sliding bearing extreme working condition simulation test device of the present invention;

[0018] Figure 3A longitudinal sectional view of a sliding bearing extreme working condition simulation test device according to the present invention;

[0019] Figure 4 An exploded view of the magnetic field excitation component of the present invention;

[0020] Figure 5 It is a schematic diagram of the end face structure assembly of the thermal test bearing assembly of the present invention.

[0021] Among them, in the figure:

[0022] 1. Test sleeve assembly; 2. Magnetic field excitation assembly; 3. Thermal test bearing assembly; 4. Test chamber assembly; 5. Static force loading assembly; 101. Cantilever shaft; 102. Loading ring; 103. Test sleeve; 104. Positioning pin; 105. Circlip; 106. Lock nut; 201. Magnetic inner ring; 202. Insulation cotton; 203. Electromagnetic coil; 204. Upper magnetic outer ring; 205. Lower magnetic outer ring ; 206, connecting bolt; 207, control power supply; 301, test bearing; 302, end face locating pin; 303, first connecting screw; 304, oil supply pipe; 305, heating rod; 401, upper cavity; 402, lower cavity; 403, fastening bolt; 404, sealing gasket; 405, end cover; 406, second connecting screw; 407, oil return pipe; 408, circumferential locating pin; 501, connecting pin. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] like Figures 1-4 As shown, the present invention provides a sliding bearing extreme working condition simulation test device, which mainly includes: a test sleeve assembly 1, a magnetic field excitation assembly 2, a thermal test bearing assembly 3, a test cavity assembly 4, and a static force loading assembly 5. The test cavity assembly 4 directly bears the external static load. The test sleeve assembly 1 serves as the moving part of the bearing test and can effectively suppress the bending deformation of the cantilever shaft 101 under heavy load. The thermal test bearing assembly 3 serves as the static part of the bearing test and can provide a temperature-controlled local high-temperature environment for the bearing test. The magnetic field excitation assembly 2 can provide a magnetic field environment with controllable magnetic field strength for the bearing test. The static force loading assembly 5 can provide an extreme load environment with controllable load for the bearing test.

[0025] The test sleeve assembly 1 includes a cantilever shaft 101, a load ring 102, a test sleeve 103, a positioning pin 104, a circlip 105 and a locking nut 106; the load ring 102 is mounted on the cantilever shaft 101 and is axially positioned by the shaft shoulder on the cantilever shaft 101, and the test sleeve 103 is also mounted on the cantilever shaft 101 and is axially positioned by the shaft shoulder on the cantilever shaft 101, and there is a gap between the outer and inner surfaces of the load ring 102 and the inner surface of the test sleeve 103 and the outer surface of the cantilever shaft 101, respectively. When the test sleeve 103 is greatly bent and deformed due to heavy load and exceeds the gap amount, the test sleeve 103 is axially positioned. When in contact with the outer cylindrical surface of the load-bearing ring 102, the load-bearing ring 102 performs secondary load-bearing, and the bending deformation of the cantilever shaft 101 is reduced through the stepped load-bearing of the test sleeve 103 and the load-bearing ring 102; the positioning shaft pin 104 passes through the radial pin holes on the test sleeve 103 and the cantilever shaft 101 to prevent the test sleeve 103 from generating circumferential rotational motion relative to the cantilever shaft 101, and the elastic retaining ring 105 is installed in the groove of the cantilever shaft 101 to prevent the positioning shaft pin 104 from falling; the locking nut 106 is installed on the shaft end thread of the cantilever shaft 101 to limit the axial displacement of the test sleeve 103 relative to the cantilever shaft 101.

[0026] The magnetic field excitation component 2 includes a magnetic inner ring 201, thermal insulation cotton 202, an electromagnetic coil 203, an upper magnetic outer ring 204, a lower magnetic outer ring 205, a connecting bolt 206 and an external control power supply 207; the magnetic inner ring 201 is an integral type, and the thermal insulation cotton 202 is attached to the outer circular groove of the magnetic inner ring 201, and the electromagnetic coil 203 is tightly wound on the thermal insulation cotton 202 in multiple layers; the upper magnetic outer ring 204 and the lower magnetic outer ring 205 are respectively matched with the stepped groove of the outer circular edge of the magnetic inner ring 201 through the stepped groove of the inner circular edge, and are connected by the connecting bolt 206, so that the electromagnetic The coil 203 is sealed in a cavity formed by the upper magnetic outer ring 204, the lower magnetic outer ring 205 and the magnetic inner ring 201; the input and output wires of the electromagnetic coil 203 pass through the small holes machined in the upper magnetic outer ring 204 and are connected to the external control power supply 207; the inner surface of the magnetic inner ring 201 is machined with a circular boss for installing and positioning the test bearing 301; the outer cylindrical surfaces of the upper magnetic outer ring 204 and the lower magnetic outer ring 205 are machined with grooves, which will cooperate with the inner cylindrical bosses of the upper cavity 401 and the lower cavity 402 of the test cavity assembly 4 to achieve positioning and assembly.

[0027] The thermal test bearing assembly 3 includes a test bearing 301, an end face positioning pin 302, a first connecting screw 303, an oil supply pipe 304 and a heating rod 305 for realizing local high temperature thermal control; the test bearing 301 is an integral circular bearing, the outer diameter of the test bearing 301 is processed with a shaft shoulder boss, and the end face is processed with a pin hole, a threaded hole, an oil inlet hole and a heating hole. Figure 3As shown, the outer cylindrical shoulder boss of the test bearing 301 cooperates with the circular boss on the inner surface of the magnetic inner ring 201, as shown in FIG. Figure 5 As shown, the circumferential positioning of the test bearing 301 and the magnetic inner ring 201 is achieved by the end face positioning pin 302, and the test bearing 301 and the magnetic inner ring 201 are fixed by the first connecting screw 303; the oil inlet hole on the end face of the test bearing 301 is connected to the oil supply pipe 304 to realize the oil supply and lubrication of the test bearing 301, and the heating rod 305 is installed in the heating hole on the end face of the test bearing 301. The position of the heating hole is determined according to the test needs. By controlling the position and temperature of the heating rod 305, the local high temperature during the operation of the sliding bearing is simulated.

[0028] The test chamber assembly 4 is a chamber structure split into upper and lower parts, including an upper chamber 401, a lower chamber 402, a fastening bolt 403 connecting the upper chamber 401 and the lower chamber 402, an end cover 405 for sealing the end surface of the upper chamber 401 and the lower chamber 402 after combination, a sealing gasket 404 and a second connecting screw 406, as well as an oil return pipe 407 and a circumferential positioning pin 408. The inner surfaces of the upper cavity 401 and the lower cavity 402 are processed with bosses, which respectively cooperate with the outer surface grooves of the upper magnetic outer ring 204 and the lower magnetic outer ring 205, and the circumferential positioning pin 408 passing through the inner hole of the upper cavity 401 is used to realize circumferential positioning and constraint of the magnetic field excitation component 2; two pin holes are opened at both ends of the upper cavity 401, which will be connected to the static force loading component 5 through two connecting pins 501 to realize load force simulation; an oil hole is opened on the bottom side of the lower cavity 402, and a return oil pipe 407 is installed to realize the circulation of lubricating oil inside the test cavity component 4.

[0029] The static force loading assembly 5 is a four-bar linkage, which is connected to the upper cavity 401 of the test cavity assembly 4 through two connecting pins 501. The external force-applying device applies tension or pressure to the test cavity assembly 4 through the static force loading assembly 5 and generates an upward or downward displacement, thereby changing the oil film gap between the test bearing 301 and the test sleeve 103 installed inside the test cavity assembly 4, thereby realizing the loading force simulation of the test bearing 301.

[0030] When the extreme working condition simulation test device for sliding bearings is working, the external motor system drives the cantilever shaft 101 to rotate, so that relative movement is generated between the test sleeve 103 and the test bearing 301, thereby achieving the purpose of simulating the rotational speed; the external load application device changes the oil film gap between the test bearing 301 and the test sleeve 103 through the static force loading component 5, thereby achieving the purpose of applying a simulated load to the test bearing 301; the external AC or DC power supply changes the magnetic field type and size of the electromagnetic coil, thereby achieving the purpose of applying an electromagnetic field to the test bearing 301; the external power supply controls the temperature of the heating rod 305, thereby achieving the purpose of applying high temperature to the test bearing 301.

[0031] The working principle and process of the present invention are:

[0032] The cantilever shaft 101 will be supported by other devices and connected to the drive motor, and a sliding bearing extreme working condition simulation test device implemented by thermal-mechanical-magnetic active control will be installed on the cantilever section of the cantilever shaft 101.

[0033] When the cantilever shaft 101 is stationary, the cantilever shaft 101 is used as the base, and the inner circular surface of the load-bearing ring 102 is put on the cantilever shaft 101, and moved from the end of the cantilever shaft 101 to the large diameter direction, and the load-bearing ring 102 is axially positioned by the shoulder on the cantilever shaft 101; further, the inner circular surface of the test sleeve 103 is put on the cantilever shaft 101, and moved from the end of the cantilever shaft 101 to the large diameter direction, and the test sleeve 103 is axially positioned by another matching shoulder on the cantilever shaft 101, and at the same time, the test sleeve 103 is rotated to align its pin hole with the pin hole on the cantilever shaft 101, and the positioning shaft pin 104 is inserted; at this point, the first assembly is formed. There is a gap between the outer cylindrical surface of the load-bearing ring 102 and the inner cylindrical surface of the test sleeve 103 within a certain distance range, and there is also a gap between the inner cylindrical surface of the load-bearing ring 102 and the outer cylindrical surface of the cantilever shaft 101 within a certain distance range. These two gaps provide space for the test sleeve 103 and the load-bearing ring 102 to deform due to excessive external load, thereby reducing the bending deformation of the cantilever shaft 101.

[0034] Furthermore, the main components of the magnetic field excitation assembly 2, the thermal test bearing assembly 3 and the test cavity assembly 4 are installed to form a second assembly.

[0035] Using the integral magnetic inner ring 201 as the base, a layer of thermal insulation cotton 202 is installed within the groove on the outer circumference of the inner ring 201. Electromagnetic coils 203 with varying numbers of turns are then wound circumferentially around the surface of the thermal insulation cotton 202. The input and output wires of the electromagnetic coils 203 are simultaneously routed through small holes machined into the upper magnetic outer ring 204 and then led out. The upper and lower magnetic outer rings 204 and 205 are assembled integrally with the stepped grooves on the inner circumference of the inner ring 201, sealing the electromagnetic coils 203 within the cavity formed by the upper and lower magnetic outer rings 204 and 205, respectively, and the inner ring 201. Connecting bolts 206 are then used to position and secure the upper and lower magnetic outer rings 204 and 205 to the inner ring 201. This completes the assembly of the magnetic field excitation assembly 2.

[0036] Furthermore, the outer groove of the lower magnetic outer ring 205 of the magnetic field excitation assembly 2 is pressed and mounted on the inner boss of the lower cavity 402 of the test cavity assembly 4. The input and output wires of the electromagnetic coil 203 are simultaneously passed through the holes in the upper portion of the upper cavity 401 of the test cavity assembly 4 and led out. At the same time, the inner boss of the upper cavity 401 is pressed and mounted in the outer groove of the upper magnetic outer ring 204 of the magnetic field excitation assembly 2. The circumferential position of the magnetic field excitation assembly 2 is fine-tuned so that the pin hole of the upper cavity 401 is aligned with the countersunk hole in the outer groove of the upper magnetic outer ring 204, and the circumferential positioning pin 408 is inserted to achieve circumferential positioning of the magnetic field excitation assembly 2 relative to the upper cavity 401. The upper cavity 401 and the lower cavity 402 are then connected and tightened using eight fastening bolts 403, so that the magnetic field excitation assembly 2, the upper cavity 401, and the lower cavity 402 form an assembly.

[0037] Furthermore, if Figure 3 and Figure 5 As shown, the outer surface of the test bearing 301 is mated with the inner boss surface of the magnetic inner ring 201. The left end face of the inner boss of the magnetic inner ring 201 is mated with the left lug of the test bearing 301 to achieve axial positioning of the test bearing 301. The pin hole on the left end face of the inner boss of the magnetic inner ring 201 is aligned with the pin hole on the left lug of the test bearing 301. The end face locating pin 302 is inserted to achieve circumferential positioning of the test bearing 301. The test bearing 301 is then fixed to the inner boss of the magnetic inner ring 201 using the first connecting screw 303. At this point, the second assembly is formed.

[0038] Next, the second assembly is mounted on the test bushing 103 of the first assembly, and the connecting pin 501 is inserted through the pin holes at both ends of the upper cavity 401 in the test cavity assembly 4. At this point, the static force loading assembly 5 is connected to the second assembly, and the static force loading assembly 5 is connected to the other fixed structures and external loading device of the test bench. The static force loading assembly 5 is used to lift the second assembly, so that there is a gap between the test bearing 301 and the test bushing 103 around the circumference.

[0039] Furthermore, the oil supply pipe 304 and the heating rod 305 are sequentially passed through the reserved holes on the end cover 405 and installed into the oil hole and the heating hole in the test bearing 301. At this point, the installation of the components of the thermal test bearing assembly 3 is completed.

[0040] Furthermore, a circlip 105 is installed in the groove of the cantilever shaft 101 where the positioning pin 104 is located to prevent the positioning pin 104 from falling during high-speed rotation. A locking nut 106 is also installed on the threaded end of the cantilever shaft 101 to limit axial displacement of the test sleeve 103 relative to the cantilever shaft 101. At this point, the components of the test sleeve assembly 1 are fully assembled.

[0041] Furthermore, the sealing gasket 404 and end cap 405 are secured to the threaded holes on the left sides of the upper and lower chambers 401 and 402 using second connecting screws 406, creating a closed test chamber. Simultaneously, the oil return pipe 407 is threadedly connected to the lower right side of the lower chamber 402. At this point, the components of the test chamber assembly 4 are completely installed. The described extreme operating condition simulation test device for sliding bearings is now complete.

[0042] During the test, the oil supply pipe 304 is connected to the external lubrication and cooling system to supply oil to the test bearing 301; the cantilever shaft 101 is connected to the external motor system to drive the cantilever shaft 101 to rotate, so that relative movement is generated between the test sleeve 103 and the test bearing 301, thereby achieving the purpose of simulating the rotational speed; the static force loading component 5 is connected to the external load application device, and a load is applied to the second combination consisting of the test cavity component 4, the magnetic field excitation component 2 and the thermal test bearing component 3 to generate displacement, thereby changing the oil film gap between the test bearing 301 and the test sleeve 103, thereby achieving the purpose of applying a simulated load to the test bearing 301; the electromagnetic coil 203 is connected to the external control power supply 207, and by regulating the magnetic field type and size of the electromagnetic coil, the purpose of applying a controllable electromagnetic field to the test bearing 301 is achieved; the heating rod 305 is connected to the external heating power supply, and high temperature is applied to different positions of the test bearing 301, thereby achieving the purpose of simulating the influence of extreme high temperature on lubrication during bearing operation.

[0043] The present invention proposes a sliding bearing extreme working condition simulation test device, which can simulate abnormal extreme working conditions such as external loads, electromagnetic fields and local high temperatures, and thus realize the testing of the bearing lubrication performance and wear characteristics under non-extreme working condition parameters.

[0044] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0045] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A sliding bearing extreme working condition simulation test device, characterized in that: include: A test sleeve assembly (1), a magnetic field excitation assembly (2), a thermal test bearing assembly (3), a test cavity assembly (4) and a static force loading assembly (5); the test cavity assembly (4) serves as a bearing seat of the test bearing (301) and directly bears the external static load generated by the static force loading assembly (5); the test sleeve assembly (1) serves as a moving part of the bearing test to suppress the bending deformation of the cantilever shaft (101) under heavy load; the thermal test bearing assembly (3) serves as a static part of the bearing test to provide a temperature-controllable local high-temperature environment for the bearing test; the magnetic field excitation assembly (2) serves as a magnetic field environment with controllable magnetic field strength for the bearing test; and the static force loading assembly (5) serves as a load-controllable extreme load environment for the bearing test.

2. A sliding bearing extreme working condition simulation test device according to claim 1, characterized in that: The test shaft sleeve assembly (1) comprises a cantilever shaft (101), a load-bearing ring (102), a test shaft sleeve (103), a positioning shaft pin (104), an elastic retaining ring (105) and a locking nut (106); the load-bearing ring (102) is mounted on the cantilever shaft (101) and is axially positioned by a shaft shoulder on the cantilever shaft (101); the test shaft sleeve (103) is mounted on the cantilever shaft (101) and is axially positioned by a shaft shoulder on the cantilever shaft (101); the outer circumferential surface and the inner circumferential surface of the load-bearing ring (102) are aligned with the inner circumferential surface of the test shaft sleeve (103) and the cantilever shaft (101). A gap is left between the outer cylindrical surfaces of the arm shaft (101); the positioning pin (104) passes through the radial pin holes on the test sleeve (103) and the cantilever shaft (101) to prevent the test sleeve (103) from generating circumferential rotational motion relative to the cantilever shaft (101); the elastic retaining ring (105) is installed in the groove of the test sleeve (103) to prevent the positioning pin (104) from falling; the locking nut (106) is installed on the shaft end thread of the cantilever shaft (101) to limit the axial displacement of the test sleeve (103) relative to the cantilever shaft (101).

3. A sliding bearing extreme working condition simulation test device according to claim 2, characterized in that: The magnetic field excitation component (2) comprises a magnetic inner ring (201), thermal insulation cotton (202), an electromagnetic coil (203), an upper magnetic outer ring (204), a lower magnetic outer ring (205), a connecting bolt (206) and an external control power supply (207); the magnetic inner ring (201) is integral, the thermal insulation cotton (202) is attached to the outer circular groove of the magnetic inner ring (201), and the electromagnetic coil (203) is tightly wound on the thermal insulation cotton (202) in multiple layers; the upper magnetic outer ring (204) and the lower magnetic outer ring (205) are respectively matched with the stepped groove of the outer circular edge of the magnetic inner ring (201) through the stepped groove of the inner circular edge and connected through the connecting bolt (206), so that the electromagnetic coil (203) is connected to the outer circular edge of the magnetic inner ring (201) through the stepped groove of the inner circular edge. The magnetic coil (203) is sealed in a cavity formed by the upper magnetic outer ring (204), the lower magnetic outer ring (205) and the magnetic inner ring (201); the input and output wires of the electromagnetic coil (203) are simultaneously passed through the small holes machined in the upper magnetic outer ring (204) and connected to the external control power supply (207); the inner surface of the magnetic inner ring (201) is machined with a circular boss for installing and positioning the test bearing (301); the outer cylindrical surfaces of the upper magnetic outer ring (204) and the lower magnetic outer ring (205) are machined with grooves, which will cooperate with the inner cylindrical bosses of the upper cavity (401) and the lower cavity (402) of the test cavity assembly (4) to achieve positioning and assembly.

4. A sliding bearing extreme working condition simulation test device according to claim 3, characterized in that: The thermal test bearing bush assembly (3) comprises a test bearing bush (301), an end face positioning pin (302), a first connecting screw (303), an oil supply pipe (304) and a heating rod (305) for realizing local high temperature thermal control; the test bearing bush (301) is an integral circular bearing bush, the outer circle of the test bearing bush (301) is processed with a shaft shoulder boss, and the end face is processed with a pin hole, a threaded hole, an oil inlet hole and a heating hole; the outer circle shaft shoulder boss of the test bearing bush (301) and the circular boss on the inner surface of the magnetic inner ring (201) are connected The test bearing (301) and the magnetic inner ring (201) are matched to achieve circumferential positioning of the test bearing (301) and the magnetic inner ring (201) through the end face positioning pin (302), and the test bearing (301) and the magnetic inner ring (201) are fixed through the first connecting screw (303); the oil inlet hole on the end face of the test bearing (301) is connected to the oil supply pipe (304) to achieve oil supply and lubrication of the test bearing (301); the heating rod (305) is installed in the heating hole on the end face of the test bearing (301).

5. The extreme working condition simulation test device for sliding bearings according to claim 4, characterized in that: The test chamber assembly (4) is a chamber structure that is split up and down, comprising an upper chamber (401), a lower chamber (402), a fastening bolt (403) connecting the upper chamber (401) and the lower chamber (402), an end cover (405) for sealing the end surface of the upper chamber (401) and the lower chamber (402), a sealing gasket (404) and a second connecting screw (406), an oil return pipe (407) and a circumferential positioning pin (408); the inner surfaces of the upper chamber (401) and the lower chamber (402) are machined with bosses, which are respectively connected to the The outer circumferential grooves of the upper magnetic outer ring (204) and the lower magnetic outer ring (205) are matched, and the circumferential positioning pin (408) passing through the inner hole of the upper cavity (401) is used to realize circumferential positioning and constraint of the magnetic field excitation component (2); two pin holes are opened at both ends of the upper cavity (401), which are connected to the static force loading component (5) through two connecting pins (501) to realize load force simulation; an oil hole is opened on the bottom side of the lower cavity (402), and the return oil pipe (407) is installed to realize the circulation of lubricating oil inside the test cavity component (4).

6. A sliding bearing extreme working condition simulation test device according to claim 5, characterized in that: The static force loading assembly (5) is a four-bar linkage, which is connected to the upper cavity (401) of the test cavity assembly (4) through two connecting pins (501). The external force application device applies tension or pressure to the test cavity assembly (4) through the static force loading assembly (5) and generates an upward or downward displacement, thereby changing the oil film gap between the test bearing (301) and the test sleeve (103) installed inside the test cavity assembly (4), thereby realizing loading force simulation of the test bearing (301).

7. A sliding bearing extreme working condition simulation test device according to claim 6, characterized in that: During operation, the cantilever shaft (101) is driven to rotate by an external motor system, so that relative motion is generated between the test sleeve (103) and the test bearing (301), thereby achieving the purpose of simulating the rotation speed; the external load applying device changes the oil film gap between the test bearing (301) and the test sleeve (103) through the static force loading component (5), thereby achieving the purpose of applying a simulated load to the test bearing (301); the magnetic field type and size of the electromagnetic coil are changed by an external AC or DC power supply, thereby achieving the purpose of applying an electromagnetic field to the test bearing (301); the temperature of the heating rod (305) is controlled by an external power supply, thereby achieving the purpose of applying a high temperature to the test bearing (301).

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