Fluorescence labeling method and device for grease oil distribution in composite lubrication bearing

Abstract

The invention relates to a fluorescence labeling method and device for grease oil distribution in a composite lubrication bearing, and the method comprises the following steps: replacing a bearing outer ring and a sealing ring of the composite lubrication bearing with a light-transmitting material, and forming a light-transmitting region through which lubricating oil and lubricating grease in the bearing outer ring can be seen on the excircle surface of the bearing outer ring; a first fluorescent agent is fused in lubricating oil of the composite lubricating bearing, a second fluorescent agent is fused in lubricating grease of the composite lubricating bearing, and excitation wave bands of the first fluorescent agent and the second fluorescent agent do not coincide; the moving freedom degree in the axis direction of the composite lubricating bearing is limited; a first excitation light source used for exciting the first fluorescent agent and a second excitation light source used for exciting the second fluorescent agent are arranged on the outer side of the composite lubrication bearing to irradiate lubricating oil and lubricating grease in the composite lubrication bearing. And the lubricating oil and the lubricating grease are labeled through differentiated fluorescence, so that dynamic distribution real-time observation of the lubricating oil and the lubricating grease can be realized, and the efficiency of bearing design optimization and lubricating material screening is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing lubrication detection, and specifically to a fluorescence marking method and device for the grease-oil distribution in a composite lubrication bearing. Background Art

[0002] As the "mother machine of industry", machine tools are the foundation of high-end equipment manufacturing, and their accuracy and reliability directly determine the processing level in fields such as aerospace, automotive, and precision molds. The lubrication state of machine tool bearings will directly affect the machining accuracy. Currently, more than 90% of rolling bearings use grease lubrication. Grease lubrication has a low use cost and has certain sealing and anti-corrosion effects. However, due to the fact that the main shaft bearings of high-grade CNC machine tools work in a harsh environment of high speed, alternating loads, temperature fluctuations, and micron-level positioning accuracy requirements for a long time. The lubricating grease in the bearing will accelerate the exudation of the base oil in the lubricant under the action of shear stress and centrifugal force, resulting in the softening or hardening effect of the lubricating grease, greatly shortening the service life of the grease-bearing.

[0003] The bearing grease-oil composite lubrication technology is a composite lubrication technology to avoid the premature entry of the main shaft bearings of high-end machine tools into the state of poor oil lubrication or dry friction. Usually, sealed bearings are used, which are internally filled with a certain content of lubricating grease and are equipped with porous oil-containing cages. As the bearing speed increases, the lubricating oil stored inside the porous composite cage will continuously exude under the action of centrifugal force, thermal expansion, and the mutual extrusion between the rolling elements and the cage, and transfer to the raceway through the steel balls to form a lubricating oil film; when the bearing speed decreases, the lubricating oil on the surface of the cage is sucked into the cage by the microporous channels under the action of capillary force to complete the storage and release of the lubricating oil. The lubrication method combining the porous self-lubricating cage and grease lubrication can not only greatly delay the failure time of the lubricating grease but also achieve the long-life and high-precision operation of the bearing.

[0004] Although the grease-oil composite lubrication method has significant advantages, the actual distribution of lubricating oil and lubricating grease in the composite lubrication system has become the key bottleneck affecting the optimization of bearing performance and the selection of lubricating materials. From the dimension of bearing optimization design, the distribution uniformity of lubricating oil and lubricating grease in key parts such as the bearing raceway, rolling elements, and cage directly determines the integrity and stability of the interface lubricating oil film. From the analysis of the lubricating grease selection link, the compatibility differences between lubricating greases of different thickener types and lubricating oils are significant, which may lead to the formation of a "plugging effect" or "leakage channel" inside the bearing. The core of such problems lies in the lack of real-time characterization technology for the spatial distribution of the composite lubrication system, making the process of oil and grease selection rely on a large number of trials and errors.

[0005] Therefore, it is necessary to propose a fluorescence marking method and device for the grease-oil distribution in a composite lubrication bearing. Summary of the Invention

[0006] The object of the present invention is to provide a fluorescence labeling method and device for the grease and oil distribution in a composite lubricating bearing. By differentially fluorescently labeling the lubricating oil and grease, it is possible to realize real-time observation of the dynamic distribution of the lubricating oil and grease, and improve the efficiency of bearing design optimization and lubricating material screening.

[0007] The technical solution adopted by the present invention is: a fluorescence labeling method for the grease and oil distribution in a composite lubricating bearing, comprising the following steps: Replace the bearing outer ring and the sealing ring of the composite lubricating bearing with a light-transmitting material, so as to form a light-transmitting area on the outer cylindrical surface of the bearing outer ring for visualizing the internal lubricating oil and grease therein; Integrate a first fluorescent agent into the lubricating oil of the composite lubricating bearing, and integrate a second fluorescent agent into the grease of the composite lubricating bearing, and the excitation bands of the first fluorescent agent and the second fluorescent agent do not overlap; Carry the composite lubricating bearing and restrict the freedom of movement in the axial direction thereof; Configure a first excitation light source for exciting the first fluorescent agent and a second excitation light source for exciting the second fluorescent agent outside the composite lubricating bearing to irradiate the lubricating oil and grease inside the composite lubricating bearing; Control the composite lubricating bearing to rotate along its axis, keep the first fluorescent agent and the second fluorescent agent in the lubricating oil and grease continuously excited, and configure a high-speed camera with a dual-band filter on the lens to capture the light-transmitting area along the radial direction of the composite lubricating bearing to obtain a local fluorescence image of the light-transmitting area; Configure a computer to receive the local fluorescence image, and generate a local two-dimensional distribution map of the lubricating oil and grease in the composite lubricating bearing according to the pixel coverage area and gray intensity of the local fluorescence image.

[0008] As a preferred solution, configure an angle sensor to detect the rotation angle of the composite lubricating bearing, and when the composite lubricating bearing rotates to a set angle, control the high-speed camera to take an immediate shot through a synchronous trigger. This synchronization mechanism can ensure that the bearing rotation angle at each image acquisition moment strictly corresponds to the preset position, so that multiple consecutive frames of images maintain a deterministic corresponding relationship in spatial position, which is convenient for subsequent superposition of the lubrication distribution state of the entire bearing.

[0009] As a preferred solution, after the computer receives the local fluorescence image, preprocess the local fluorescence image to obtain a fluorescence pseudocolor image; Overlay the transparent contour of the composite lubricating bearing on the fluorescence pseudocolor image to obtain the real-time distribution state of the first fluorescent agent and the second fluorescent agent; Distinguish the fluorescence signals of the first fluorescent agent and the second fluorescent agent, and calculate the pixel coverage area and gray intensity of the corresponding lubricating oil and grease on the composite lubricating bearing according to the distribution states of the two fluorescence signals.

[0010] As a preferred solution, the composite lubricating bearing is controlled to rotate a complete cycle along its axis, the rotation angle of the composite lubricating bearing within this cycle is recorded, as well as the corresponding local two-dimensional distribution map for this rotation angle, and all the local two-dimensional distribution maps are stacked in time sequence to form a complete two-dimensional distribution map of the lubricating oil and grease within the composite lubricating bearing.

[0011] As a preferred solution, the bearing inner ring and cage of the composite lubricating bearing are made of non-translucent materials to avoid the fluorescence on the other side of the bearing interfering with the fluorescence image obtained on the side of the high-speed camera.

[0012] As a preferred solution, the first excitation light source and the second excitation light source are symmetrical about the visual center line of the high-speed camera. This setting enables the two kinds of fluorescence to not interfere with each other and be controllable at the same time.

[0013] As a preferred solution, the first excitation light source and the second excitation light source respectively include a first LED array and a second LED array located on both end faces of the composite lubricating bearing. The first LED array faces the gap between the bearing outer ring and the bearing inner ring along the axis direction of the composite lubricating bearing, and the second LED array is inclined towards the gap between the bearing outer ring and the bearing inner ring; since the cage and the bearing inner ring are made of non-translucent materials, the lights of the two arrays form a complement on both sides, enabling the first excitation light source and the second excitation light source to enter the bearing cage as much as possible to fully characterize the distribution relationship of the lubricating oil and grease.

[0014] As a preferred solution, the included angle between the irradiation direction of the second LED array and the visual center line of the high-speed camera is 150°; the included angle between the irradiation direction of the second LED array and the end face of the composite lubricating bearing is 45°; the excitation effect of the first excitation light source and the second excitation light source is the best at this angle.

[0015] As a preferred solution, the dual-band filter is composed of a seamless splicing of a first filter and a second filter, which can simultaneously obtain the fluorescence images of the first fluorescent agent and the second fluorescent agent and ensure accuracy.

[0016] The band of the first filter at least partially overlaps with the emission band of the first fluorescent agent; the band of the second filter at least partially overlaps with the emission band of the second fluorescent agent.

[0017] A fluorescence marking device for the distribution of grease and oil in a composite lubricating bearing, comprising: Composite lubricating bearing: It includes an outer bearing ring, an inner bearing ring, a cage, a sealing ring, steel balls, as well as lubricating oil and grease located between the outer bearing ring and the inner bearing ring; among them, the outer bearing ring and the sealing ring are made of transparent materials, the lubricating oil is mixed with a first fluorescent agent, the grease is mixed with a second fluorescent agent, and the excitation bands of the first fluorescent agent and the second fluorescent agent do not overlap; a light-transmitting area for visualizing the internal lubricating oil and grease is formed on the outer cylindrical surface of the outer bearing ring; Load-carrying main shaft: Used to fix the inner bearing ring of the composite lubricating bearing; External drive device: Used to drive the outer bearing ring of the composite lubricating bearing to rotate; Excitation light source: It includes a first excitation light source for exciting the first fluorescent agent and a second excitation light source for exciting the second fluorescent agent; the first excitation light source and the second excitation light source are respectively directed towards the gap between the outer bearing ring and the inner bearing ring; High-speed camera: Fixed relative to the composite lubricating bearing, and a dual-band filter is provided on its lens for obtaining local fluorescence images of the lubricating oil and grease within the light-transmitting area; Computer: Used to receive the local fluorescence images and generate local two-dimensional distribution maps of the lubricating oil and grease within the composite lubricating bearing.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. The fluorescence marking method for the grease and oil distribution in this composite lubricating bearing can realize real-time observation of the dynamic distribution of lubricating oil and grease, providing strong support for the optimization of bearing design; 2. The fluorescence marking method for the grease and oil distribution in this composite lubricating bearing can characterize the "plugging effect" or "leakage channel" inside the bearing through the distribution of lubricating oil and grease, providing strong support for the screening of lubricating materials; 3. The multi-module collaborative technology adopted in the fluorescence marking method for the grease and oil distribution in this composite lubricating bearing has high precision and strong anti-interference ability, effectively overcoming the limitations of traditional detection means. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is the overall schematic diagram of the present invention; Figure 2 It is the layout schematic diagram of the excitation light source in the axial direction of the present invention; Figure 3Schematic diagram of the arrangement for exciting the light source in the radial direction of the present invention; Figure 4 Schematic diagram of the dual - band filter of the present invention.

[0021] Reference numerals: 1. External drive device; 2. Composite lubricating bearing, 201. Bearing outer ring, 202. Bearing inner ring, 203. Cage, 204. Steel ball; 3. First excitation light source; 4. Second excitation light source; 5. Angle sensor; 6. Synchronous trigger; 7. High - speed camera, 701. Dual - band filter, 7011. First filter, 7012. Second filter; 8. Computer. Detailed implementation manners

[0022] Hereinafter, the present invention will be specifically described through exemplary implementation manners. However, it should be understood that, without further description, the elements, structures, and features in one implementation manner can also be beneficially combined into other implementation manners.

[0023] It should be noted that: Unless otherwise defined, the technical terms or scientific terms used herein should have the ordinary meanings understood by those of ordinary skill in the field to which the present invention belongs. The words such as "a", "one", or "the" used in the specification and claims of the present invention for patent application do not express a limitation of quantity, but mean that there is at least one; the "first", "second", and "third" used herein should not be regarded as a limitation on the order of components, but are only used to distinguish different components; words such as "comprising" or "including" indicate that the elements or objects appearing before "comprising" or "including" cover the elements or objects listed after "comprising" or "including" and their equivalents, but do not exclude other elements or objects having the same functions.

[0024] In order to more clearly describe the fluorescence - labeling method and device for the grease - oil distribution in the composite lubricating bearing, with reference to the attached Figures 1-4 This embodiment will be described: As Figures 1-3 shown, a fluorescence - labeling method for the grease - oil distribution in a composite lubricating bearing includes the following steps: S1. Configure the bearing In this embodiment, a 7008C angular contact bearing is selected as the test object. The specific parameters are as follows: the thickness of the sealing rings on both sides is 1.5 mm, the outer diameter of the bearing outer ring is 68 mm, the wall thickness is designed to be 2.5 mm, and a 15° angular contact raceway is machined on the inner side to cooperate with 14 steel balls; the bearing cage is a porous bronze cage with a porosity of 35%, an average pore diameter of 50 μm, a cage beam width of 2.2 mm, and a window gap of 0.3 mm; Replace the bearing outer ring and the sealing ring of the composite lubricating bearing 2 with a light-transmitting material (specifically, fused silica glass, which is processed by means of cutting, grinding, and polishing. After processing, the light transmittance of the bearing outer ring to visible light with a wavelength of 500 - 800 nm can reach more than 92%, facilitating external high-speed camera shooting), so as to form a light-transmitting area on the outer cylindrical surface of the bearing outer ring where the internal lubricating oil and grease can be visualized (this light-transmitting area is a part of the outer cylindrical surface of the bearing outer ring); The bearing inner ring and the cage of the composite lubricating bearing 2 are made of non-light-transmitting materials.

[0025] S2. Configure the fluorescent part Mix a first fluorescent agent into the lubricating oil of the composite lubricating bearing 2, and mix a second fluorescent agent into the grease of the composite lubricating bearing 2. The excitation bands of the first fluorescent agent and the second fluorescent agent do not overlap; The spectral characteristics of the first fluorescent agent and the second fluorescent agent do not interfere with each other and are used to separately label the lubricating oil and the grease. Specifically, the first fluorescent agent is selected as Coumarin 6 green fluorescent agent, whose excitation wavelength is 450 - 490 nm and emission wavelength is 500 - 550 nm. The first fluorescent agent is added to the PAO6 base oil at a mass fraction of 0.3% and forms a stable solution through ultrasonic dispersion without affecting the lubricating performance of the lubricating oil. The second fluorescent agent is selected as RhB-PEG red fluorescent agent, whose excitation wavelength is 530 - 560 nm and emission wavelength is 580 - 630 nm. It is added to the polyurea-based grease at a mass fraction of 0.5%, and the fluorescent agent is uniformly embedded into the three-dimensional network of the thickener through high-speed shear dispersion; After being excited, the fluorescent agent can emit light waves outward. At the same time, this excited state can last for a certain period of time; Clean and dry the accessories of the composite lubricating bearing 2 to ensure no impurities. Inject PAO6 lubricating oil containing 0.3% Coumarin 6 (filling amount 0.5 g) into the pores of the porous bronze cage, and evenly apply polyurea-based grease containing 0.5% RhB-PEG on the raceway and the surface of the steel balls (filling volume accounts for 25% of the internal free space). After the entire bearing is assembled, conduct a static inspection once to confirm that the lubricant is evenly covered.

[0026] S3. Configure the working conditions of the bearing Carry the composite lubricating bearing 2 and restrict the freedom of movement of its axis direction; Configure a load-bearing main shaft, an external drive device 1, and an angle sensor 5. Fix the bearing inner ring of the composite lubricating bearing 2 on the load-bearing main shaft. The external drive device 1 is connected to drive the bearing outer ring to rotate, and the real-time rotation angle of the bearing outer ring is detected by the angle sensor 5; Specifically, the load-bearing spindle can be a machine tool spindle, and the inner ring of the bearing can be fixed to the machine tool spindle by a double-nut pre-tightening mechanism; one end of the outer ring of the bearing is welded to a stainless steel flange with an annular belt groove on the outside by vacuum brazing. The external driving device 1 is a motor, and the motor is connected to the stainless steel flange by a belt drive. The bearing speed is continuously adjustable within 10,000 r / min.

[0027] S4. Configure an external excitation light source On the outside of the composite lubricating bearing 2, configure a first excitation light source 3 for exciting the first fluorescent agent and a second excitation light source 4 for exciting the second fluorescent agent to irradiate the lubricating oil and grease inside the composite lubricating bearing 2. Specifically, the first excitation light source 3 (blue light, main peak 470 nm) and the second excitation light source 4 (green light, main peak 546 nm) respectively match the excitation spectra of Coumarin 6 and RhB-PEG. A 465 nm band-pass filter (half-peak width 5 nm) is loaded on the first excitation light source 3, the optical power density is calibrated to 80 mW / cm², and the stray light suppression ratio ≥ 95%; a 545 nm band-pass filter (half-peak width 5 nm) is loaded on the second excitation light source 4, and the optical power density is calibrated to 120 mW / cm².

[0028] S4. Dynamic detection and data acquisition Control the composite lubricating bearing 2 to rotate along its axis, keep the first fluorescent agent and the second fluorescent agent in the lubricating oil and grease continuously excited, and make the lubricating oil and grease inside the bearing fully mix and interact; configure a high-speed camera 7 with a dual-band filter 701 on the lens to capture the light-transmitting area radially along the composite lubricating bearing 2, and obtain a local fluorescence image of the light-transmitting area. Specifically, the frame rate of the high-speed camera 7 is 20,000 fps, the resolution is 1280×1024, equipped with a 105 mm macro lens and a dual-band filter. The high-speed camera is perpendicular to the rotation axis of the composite lubricating bearing 2. Adjust the high-speed camera 701 so that the light-transmitting area on the outer circle surface of the bearing is located in the center of the camera, and keep a fixed distance from the rotating bearing. At this time, set the magnification of the high-speed camera to 1:1, the depth of field is 0.1 - 0.5 mm, the exposure time is 5 μs, and the angle sensor trigger interval is 10°. At this time, the balls and the fluorescent area in each sampled image are clear without smear; after lighting, the ambient light source needs to be turned off to avoid interference from external light on image acquisition; the exposure time selected by the camera is dynamically adjusted according to the bearing speed and the luminescence characteristics of the fluorescent agent to ensure clear imaging of the light-transmitting area. Specifically, configure an angle sensor 5 to detect the rotation angle of the composite lubricating bearing 2. When the composite lubricating bearing 2 rotates to a set angle, control the high-speed camera 7 to take an immediate shot through a synchronous trigger 6. Connect the A / B phase pulse output terminals of the angle sensor 5 to the synchronous trigger 6 through a signal transmission cable. After signal conditioning and level conversion, a TTL trigger signal that meets the interface standard of the high-speed camera 7 is generated. When the accumulated pulse amount generated by the rotation of the bearing reaches the number of pulses corresponding to the set angle, the synchronous trigger 6 immediately sends a rising-edge trigger signal to the high-speed camera 7 through the cable to accurately control the camera exposure and collect fluorescence images.

[0029] S5, Image processing and analysis S5.1, Configure the computer 8 to receive local fluorescence images and perform preprocessing on the local fluorescence images. The preprocessing includes processing techniques such as denoising and smoothing, brightness equalization, and geometric calibration to enhance the clarity and consistency of the images and obtain fluorescence pseudocolor images; superimpose the transparent contour of the composite lubricating bearing 2 on the fluorescence pseudocolor images, and accurately position through a transparent template generated by the CAD model to obtain the real-time distribution status of the first fluorescent agent and the second fluorescent agent, and display the coverage status of the lubricating oil and grease on the cage beam width and the surface of the steel balls in the raceway contact area; S5.2, Distinguish the fluorescence signals of the first fluorescent agent and the second fluorescent agent through software, and calculate the pixel coverage area and gray intensity of the corresponding lubricating oil and grease on the composite lubricating bearing 2 according to the distribution status of the two fluorescence signals to generate a local two-dimensional distribution map of the lubricating oil and grease inside the composite lubricating bearing 2; S5.3, Control the composite lubricating bearing 2 to rotate a complete cycle along its axis (the bearing rotates 360°), record the rotation angle of the composite lubricating bearing 2 within this cycle and the corresponding local two-dimensional distribution map, and stack all the local two-dimensional distribution maps in sequence to form a complete two-dimensional distribution map of the lubricating oil and grease inside the composite lubricating bearing 2; S5.4, Analyze the migration law of the lubricating oil and grease in the bearing over time according to the complete two-dimensional distribution map to provide a basis for adjusting the bearing optimization and the formula of the composite lubricating grease; After the bearing runs at high speed, the lubricating oil and grease may be separated and have gaps microscopically. This gap is the non-fluorescent area between the lubricating oil and grease. By observing the distribution of the gaps, it can provide a basis for adjusting the adaptability of the composite lubricating grease to the rotational speed inside the bearing.

[0030] In the above embodiments, to ensure that light waves can enter the inside of the cage to the greatest extent and fully excite the fluorescent agents in the lubricating oil and grease, the first excitation light source 3 and the second excitation light source 4 are set as follows: Make the first excitation light source 3 and the second excitation light source 4 symmetric about the visual center line of the high-speed camera 7.

[0031] The first excitation light source 3 and the second excitation light source 4 respectively include a first LED array (301 / 401) and a second LED array (302 / 402) located on two end face sides of the composite lubricating bearing 2. The first LED array faces the gap between the bearing outer ring and the bearing inner ring along the axis direction of the composite lubricating bearing 2, and the second LED array (the second LED array is located on the side where the bearing has a flange) obliquely faces the gap between the bearing outer ring and the bearing inner ring.

[0032] Specifically, the optimal irradiation directions are as follows: the included angle between the irradiation direction of the second LED array and the visual center line of the high-speed camera 7 is 150°; the included angle between the irradiation direction of the second LED array and the end face of the composite lubricating bearing 2 is 45°.

[0033] Refer to Figure 4 , in the above-mentioned embodiment, the used dual-band filter 701 is composed of a seamless splicing of a first filter 7011 and a second filter 7012; the wavelength band of the first filter 7011 at least partially overlaps with the emission wavelength band of the first fluorescent agent; the wavelength band of the second filter 7012 at least partially overlaps with the emission wavelength band of the second fluorescent agent; Specifically, the wavelength band of the first filter 7011 is 500 - 550 nm, and the wavelength band of the second filter 7012 is 580 - 630 nm.

[0034] A fluorescence marking device for the grease and oil distribution in a composite lubricating bearing, comprising: Composite lubricating bearing 2: including a bearing outer ring 201, a bearing inner ring 202, a cage 203, a sealing ring, steel balls 204, as well as lubricating oil and grease located between the bearing outer ring and the bearing inner ring; wherein, the bearing outer ring and the sealing ring are made of transparent materials, the lubricating oil is mixed with a first fluorescent agent, the grease is mixed with a second fluorescent agent, and the excitation wavelength bands of the first fluorescent agent and the second fluorescent agent do not overlap; a light-transmitting area for visualizing the internal lubricating oil and grease is formed on the outer circumferential surface of the bearing outer ring; Carrying main shaft: used to fix the bearing inner ring of the composite lubricating bearing 2; External driving device 1: used to drive the rotation of the bearing outer ring of the composite lubricating bearing 2; Excitation light source: including a first excitation light source 3 for exciting the first fluorescent agent and a second excitation light source 4 for exciting the second fluorescent agent; the first excitation light source 3 and the second excitation light source 4 respectively face the gap between the bearing outer ring and the bearing inner ring; High-speed camera 7: fixed relative to the composite lubricating bearing 2, and a dual-band filter 701 is provided on its lens, used to obtain local fluorescence images of the lubricating oil and grease in the light-transmitting area; Computer 8: It is capable of performing real-time display, sequential recording, and subsequent image processing on local fluorescence images. The high-speed camera is connected to the computer through a data cable to transmit the locally acquired fluorescence images in real time. Subsequently, image processing techniques can be used to process the stored fluorescence distribution images inside the bearing to generate two-dimensional distribution maps of lubricating oil and grease and their migration patterns over time.

[0035] The parts not detailed in the above embodiments are prior art.

[0036] It should be noted that although the present invention has been described through the above embodiments, the present invention can also have many other embodiments. Without departing from the spirit and scope of the present invention, those skilled in the art can obviously make various corresponding changes and deformations to the present invention, but these changes and deformations should all fall within the scope protected by the appended claims of the present invention and their equivalents.

Claims

1. A fluorescence labeling method for grease and oil distribution in a composite lubricating bearing, characterized in that, Including the following steps: Replace the bearing outer ring and the sealing ring of the composite lubricating bearing (2) with a light-transmitting material, so as to form a light-transmitting area on the outer cylindrical surface of the bearing outer ring through which the internal lubricating oil and grease can be seen; Mix a first fluorescent agent into the lubricating oil of the composite lubricating bearing (2), and mix a second fluorescent agent into the grease of the composite lubricating bearing (2), and the excitation bands of the first fluorescent agent and the second fluorescent agent do not overlap; Carry the composite lubricating bearing (2) and restrict the freedom of movement in the axial direction thereof; Configure a first excitation light source (3) for exciting the first fluorescent agent and a second excitation light source (4) for exciting the second fluorescent agent outside the composite lubricating bearing (2) to irradiate the lubricating oil and grease inside the composite lubricating bearing (2); Control the composite lubricating bearing (2) to rotate along its axis, keep the first fluorescent agent and the second fluorescent agent in the lubricating oil and grease continuously excited, and configure a high-speed camera (7) with a dual-band filter (701) on the lens to capture the light-transmitting area along the radial direction of the composite lubricating bearing (2) to obtain a local fluorescence image of the light-transmitting area; Configure a computer (8) to receive the local fluorescence image, and generate a local two-dimensional distribution map of the lubricating oil and grease in the composite lubricating bearing (2) according to the pixel coverage area and gray intensity of the local fluorescence image; 2. The fluorescent labeling method for grease distribution in a composite lubricating bearing according to claim 1, wherein: Configure an angle sensor (5) to detect the rotation angle of the composite lubricating bearing (2), and when the composite lubricating bearing (2) rotates to a set angle, control the high-speed camera (7) to take an instant shot through a synchronous trigger (6); 3. A fluorescence labeling method for grease distribution in a composite lubricating bearing according to claim 1, characterized in that: After the computer (8) receives the local fluorescence image, preprocess the local fluorescence image to obtain a fluorescence false color map; Overlay the transparent contour of the composite lubricating bearing (2) on the fluorescence false color map to obtain the real-time distribution state of the first fluorescent agent and the second fluorescent agent; Distinguish the fluorescence signals of the first fluorescent agent and the second fluorescent agent, and calculate the pixel coverage area and gray intensity of the corresponding lubricating oil and grease on the composite lubricating bearing (2) according to the distribution states of the two fluorescence signals; 4. A fluorescence labeling method for grease and oil distribution in a composite lubricating bearing according to claim 1, characterized in that: Control the composite lubricating bearing (2) to rotate a complete cycle along its axis, record the rotation angle of the composite lubricating bearing (2) within this cycle and the corresponding local two-dimensional distribution map, and stack all the local two-dimensional distribution maps in time sequence to form a complete two-dimensional distribution map of the lubricating oil and grease in the composite lubricating bearing (2); 5. A fluorescence labeling method for grease distribution in a composite lubricating bearing according to claim 1, characterized in that: The bearing inner ring and the cage of the composite lubricating bearing (2) are made of non-light-transmitting materials; 6. A fluorescence labeling method for grease distribution in a composite lubricating bearing according to claim 1, characterized in that: Make the first excitation light source (3) and the second excitation light source (4) symmetric about the visual center line of the high-speed camera (7); 7. A fluorescence marking method for grease and oil distribution in a composite lubricating bearing according to claim 1, characterized in that: The first excitation light source (3) and the second excitation light source (4) respectively include a first LED array and a second LED array on both end face sides of the composite lubricating bearing (2), the first LED array faces the gap between the bearing outer ring and the bearing inner ring along the axial direction of the composite lubricating bearing (2), and the second LED array is inclined to face the gap between the bearing outer ring and the bearing inner ring.

8. A fluorescence labeling method for grease distribution in a composite lubricating bearing according to claim 6, characterized in that: The included angle between the irradiation direction of the second LED array and the visual center line of the high-speed camera (7) is 150°; the included angle between the irradiation direction of the second LED array and the end face of the composite lubricating bearing (2) is 45°.

9. A fluorescence marking method for grease distribution in a composite lubricating bearing according to claim 1, characterized in that: The dual-band filter (701) is composed of a first filter (7011) and a second filter (7012) spliced without a gap; The band of the first filter (7011) at least partially overlaps with the emission band of the first fluorescent agent; the band of the second filter (7012) at least partially overlaps with the emission band of the second fluorescent agent.

10. A fluorescence marking device for grease distribution in a composite lubricating bearing, characterized in that, Including: Composite lubricating bearing (2): including an outer bearing ring, an inner bearing ring, a cage, a sealing ring, steel balls, and lubricating oil and grease located between the outer bearing ring and the inner bearing ring; wherein, the outer bearing ring and the sealing ring are made of transparent materials, the lubricating oil is mixed with a first fluorescent agent, the grease is mixed with a second fluorescent agent, and the excitation bands of the first fluorescent agent and the second fluorescent agent do not overlap; a light-transmitting area for visualizing the internal lubricating oil and grease is formed on the outer cylindrical surface of the outer bearing ring; Carrying spindle: used to fix the inner bearing ring of the composite lubricating bearing (2); External drive device (1): used to drive the outer bearing ring of the composite lubricating bearing (2) to rotate; Excitation light source: including a first excitation light source (3) for exciting the first fluorescent agent and a second excitation light source (4) for exciting the second fluorescent agent; the first excitation light source (3) and the second excitation light source (4) are respectively directed towards the gap between the outer bearing ring and the inner bearing ring; High-speed camera (7): fixed relative to the composite lubricating bearing (2), and having a dual-band filter (701) on its lens, for obtaining local fluorescence images of the lubricating oil and grease in the light-transmitting area; Computer (8): used to receive the local fluorescence images and generate local two-dimensional distribution maps of the lubricating oil and grease within the composite lubricating bearing (2).

Images