A visual bearing lubrication device for mills

Abstract

This invention provides a visual bearing lubrication device for mills, belonging to the field of mill technology. The device includes a bearing housing, a bearing, and a bearing cover. The bearing cover has a main oil inlet, a spare oil inlet, and a double-sealed hydraulic quick-change connector. The side wall of the bearing housing has an observation window and a self-cleaning, pressure-resistant coated glass. The oil drain is connected to a filter assembly. This invention achieves continuous oil supply without stopping the mill through one-button switching between dual oil circuits. The pressure-resistant glass provides direct monitoring of the bearing lubrication status and oil level, and the filter assembly filters out impurities from the returned oil. This ensures continuous mill production, reduces bearing wear, improves the stability of the lubrication system, and lowers maintenance costs.

Description

Technical Field

[0001] This utility model belongs to the field of mill technology, specifically relating to a visual bearing lubrication device for mills. Background Technology

[0002] Mills are key grinding equipment in industries such as mining, metallurgy, building materials, and power. The large and small gear devices in their transmission system are connected to the main motor and slow-speed transmission device, driving the large gear to rotate the cylinder and undertaking the task of transmitting huge torque. They are the core components for the stable operation of the equipment.

[0003] The pinion gear unit operates under extreme conditions such as heavy load, low to medium speed, high dust, high vibration, and high temperature for extended periods, and its operating status directly affects the safety and production efficiency of the mill system. Existing pinion gear units suffer from the following problems: 1. Inconvenient lubrication system maintenance: The oil circuit is simple, and once a blockage or leak occurs, the machine must be shut down for maintenance, which will affect production; 2. Difficulty in monitoring bearing condition: It is impossible to visually observe the bearing lubrication status and oil level, which can easily lead to bearing wear due to insufficient oil or poor lubrication; 3. Frequent oil circuit failures: Impurities may be mixed into the return oil, which can exacerbate oil circuit blockage and equipment wear. Utility Model Content

[0004] The present invention aims to solve the problems mentioned in the background art by providing a visual bearing lubrication device for mills.

[0005] The specific technical solution is as follows: A visual bearing lubrication device for a mill includes a bearing housing, a bearing embedded in the bearing housing, and a bearing cover connected to the bearing housing. The bearing cover has an oil inlet at its top. The oil inlet includes a main oil inlet and a backup oil inlet. Both the main oil inlet and the backup oil inlet are connected to the bearing lubrication cavity through independent internal oil passages. The main oil inlet and the backup oil inlet are connected by a double-sealed hydraulic quick-change connector to achieve one-button switching between the two oil circuits. The bearing housing has an observation window with a flange seat on its side wall. The observation window is fixed with an oil-resistant nitrile rubber sealing ring and stainless steel internal hex bolts. The self-cleaning coated pressure-resistant glass is ≥1.6MPa and temperature-resistant from -20℃ to 150℃. The observation window can observe the main oil inlet outlet area, the bearing raceway oil film area, the oil outlet return area, and the raised oil level line on the inner wall of the bearing housing. The double-sealed hydraulic quick-change connector is connected to an external oil supply line, and the bearing housing is provided with an oil drain port that communicates with its internal lubrication chamber. The oil drain port is connected to an external oil return line.

[0006] As a preferred embodiment of this utility model, a filter assembly is connected to the oil drain port of the bearing housing. The filter assembly includes a transparent filter shell with one end screwed onto the oil drain port and a filter element installed inside the transparent filter shell. An end cap is screwed onto the end of the transparent filter shell away from the oil drain port. A connecting nozzle for connecting to an external oil return pipeline is integrally provided on the outer side of the end cap.

[0007] As a preferred embodiment of this utility model, the interior of the transparent filter shell is provided with an annular step, and the filter element is pressed against the annular step and the inner side of the end cap.

[0008] As a preferred embodiment of this utility model, the filter housing of the filter assembly is made of transparent polycarbonate material with a temperature resistance of ≥120℃, and the bottom of the filter housing has a manual ball valve drain port; the filter element is an 80-120 mesh 304 stainless steel filter element.

[0009] As a preferred embodiment of this utility model, one end of the filter housing is integrally provided with a first threaded opening that matches the oil drain port, and the other end of the filter housing is integrally provided with a second threaded opening that matches the end cap.

[0010] As a preferred embodiment of this utility model, the self-cleaning coated pressure-resistant glass is borosilicate glass with a thickness of 8-12mm, and the surface is coated with a silica hydrophobic and oleophobic film with a water contact angle ≥110° and an oil contact angle ≥90°.

[0011] As a preferred embodiment of this utility model, the shape of the observation window and the self-cleaning coated pressure-resistant glass is one of a circle, a rectangle or a regular hexagon, and the number of observation windows is two and they are symmetrically distributed along the bearing axis.

[0012] As a preferred embodiment of this utility model, the number of stainless steel hexagon socket head cap screws is 4-6, the strength grade is 8.8, and the tightening torque is 25-35 N·m.

[0013] As a preferred embodiment of this utility model, the internal oil passage has a diameter of 8-12mm, an inner wall roughness Ra≤1.6μm, and a distance of 10-15mm between the main oil inlet and the backup oil inlet.

[0014] This utility model has the following beneficial effects: 1. Solving oil circuit failure shutdown problems and ensuring continuous production: A dual-oil circuit structure is formed through the main oil inlet, the backup oil inlet, and the double-sealed hydraulic quick-change joint connecting the two, along with independent internal oil passages. When one oil circuit is blocked or leaking, the system can be switched to the other circuit with a single button press using the double-sealed hydraulic quick-change joint, maintaining oil supply to the bearing lubrication chamber without stopping the machine. This avoids production interruptions caused by oil circuit failures and meets the requirements for continuous mill operation. 2. Achieve visualized monitoring of bearing lubrication and reduce wear risk: The observation window on the side wall of the bearing housing is fixed with self-cleaning coated pressure-resistant glass through an oil-resistant nitrile rubber seal and stainless steel internal hex bolts. This glass allows for clear observation of the oil outlet area of ​​the main oil inlet inside the bearing housing, the oil film area of ​​the bearing raceway, the oil return area of ​​the oil outlet, and the raised oil level line. It enables real-time monitoring of the bearing lubrication status and oil quantity, timely detection of insufficient oil or poor lubrication, and reduction of bearing wear caused by lubrication problems from the source, thereby extending the bearing service life.

[0015] 3. Purify the return oil environment and reduce oil circuit blockage and equipment wear: The filter element in the filter assembly connected to the bearing housing drain port can filter impurities in the return oil, preventing impurities from clogging the oil circuit with the return oil circulation; the transparent filter shell makes it easy to observe the filter element's filtration status, the screw-on end cap facilitates filter element replacement, and the bottom manual ball valve drain port can promptly discharge deposited impurities, further reducing the corrosion of impurities on the oil circuit and equipment, and improving the stability of the lubrication system. 4. Improve device adaptability and durability, and reduce maintenance costs: The self-cleaning coated pressure-resistant glass is made of borosilicate glass with a hydrophobic and oleophobic coating, which is temperature and pressure resistant and does not easily adhere to oil stains, reducing the frequency of cleaning; the observation window and self-cleaning coated pressure-resistant glass are available in multiple shapes and symmetrically distributed to adapt to different installation spaces and observation needs; the filter shell is made of temperature-resistant transparent polycarbonate material, and the filter element is made of stainless steel. The stainless steel internal hexagonal bolts have high strength, all of which improve the device's weather resistance and durability, reduce the frequency of component replacement, and lower long-term maintenance costs. Attached Figure Description

[0016] Figure 1 Cross-sectional view of the mill visual bearing lubrication device provided in the embodiment of this utility model. Figure 1 ; Figure 2 Cross-sectional view of the mill visual bearing lubrication device provided in the embodiment of this utility model. Figure 2 ; Figure 3 This is a schematic diagram of the structure of the filter assembly provided in an embodiment of the present utility model; Figure 4 A schematic diagram of the filter assembly provided in an embodiment of this utility model from another perspective; Figure 5 This is a cross-sectional structural diagram of the filter assembly provided in an embodiment of the present utility model.

[0017] In the attached image: 1. Bearing housing; 2. Bearing; 3. Bearing cover; 4. Oil inlet; 5. Double-sealed hydraulic quick-change connector; 6. Observation window; 7. Self-cleaning coated pressure-resistant glass; 8. Flange seat; 9. Stainless steel hexagon socket bolts; 10. Oil drain port; 11. Filter assembly; 1101. Transparent filter housing; 1102. Filter element; 1103. End cap; 1104. Connecting nozzle; 1105. Manual ball valve drain port; 1106. First threaded port; 1107. Annular step. Detailed Implementation

[0018] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this application. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0020] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0021] In the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating the connection relationship between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Example The mill visual bearing lubrication device provided in this embodiment, such as Figures 1-5As shown, the bearing includes a bearing housing 1, a bearing 2 embedded in the bearing housing 1, and a bearing cover 3 connected to the bearing housing 1. The bearing cover 3 has an oil inlet 4 at its top, which includes a main oil inlet and a backup oil inlet. Both the main oil inlet and the backup oil inlet are connected to the lubrication chamber of the bearing 2 via independent internal oil passages. The main oil inlet and the backup oil inlet are connected by a double-sealed hydraulic quick-change connector 5 to achieve one-button switching between the two oil circuits. The side wall of the bearing housing 1 has an observation window 6 with a flange seat 8. The observation window 6 is constructed with oil-resistant nitrile rubber. A self-cleaning coated pressure-resistant glass 7 with pressure ≥1.6MPa and temperature resistance of -20℃ to 150℃ is fixedly installed by a rubber sealing ring and stainless steel internal hex bolts 9. The self-cleaning coated pressure-resistant glass 7 allows observation of the main oil inlet outlet area, bearing raceway oil film area, oil outlet return area, and raised oil level line on the inner wall of the bearing housing 1. The double-sealed hydraulic quick-change connector 5 is connected to the external oil supply pipeline. The bearing housing 1 is provided with an oil outlet 10 that communicates with its internal lubrication cavity. The oil outlet 10 is connected to the external oil return pipeline.

[0023] By setting a main oil inlet, a backup oil inlet, and a double-sealed hydraulic quick-change connector 5 connecting the two, along with independent internal oil passages connected to the main and backup oil inlets, a dual oil circuit structure is formed. When one oil circuit becomes blocked or leaks, the double-sealed hydraulic quick-change connector 5 can be used to switch to the other oil circuit with one key, without stopping the machine for maintenance, ensuring continuous oil supply to the lubrication chamber of bearing 2 and avoiding production disruptions due to oil circuit failures. An observation window 6 with a flange seat 8 is opened on the side wall of bearing housing 1, and the observation window 6 is fixed with an oil-resistant nitrile rubber seal ring and stainless steel internal hex bolts 9 to a self-cleaning coated nitrile rubber seal ring. The pressure glass 7 and observation window 6 allow for clear observation of the main oil inlet outlet area, bearing raceway oil film area, oil outlet return area, and raised oil level line inside the bearing housing 1. This solves the problem of not being able to visually observe the lubrication status and oil quantity of the bearing 2, and can promptly detect insufficient oil or poor lubrication, preventing wear of the bearing 2 due to lubrication issues. The double-sealed hydraulic quick-change connector 5 is connected to the external oil supply pipeline, and the oil outlet 10 is connected to the external oil return pipeline, forming a complete oil supply and return cycle. This ensures stable operation of the lubrication system and adapts to the extreme harsh conditions of heavy-load, medium-low speed, high dust, high vibration, and high temperature working conditions of the mill.

[0024] Specifically, in this embodiment, a filter assembly 11 is connected to the oil drain port 10 of the bearing housing 1. The filter assembly 11 includes a transparent filter shell 1101 with one end screwed onto the oil drain port 10 and a filter element 1102 installed inside the transparent filter shell 1101. An end cap 1103 is screwed onto the end of the transparent filter shell 1101 away from the oil drain port 10. A connecting nozzle 1104 for connecting to an external oil return pipeline is integrally provided on the outer side of the end cap 1103.

[0025] A filter assembly 11 is connected to the oil drain port 10 of the bearing housing 1. The filter element 1102 in the filter assembly 11 can filter the return oil flowing out of the oil drain port 10, remove impurities mixed in the return oil, reduce the blockage of the oil circuit caused by impurities circulating with the return oil, and at the same time avoid impurities from aggravating equipment wear. The transparent filter shell 1101 of the filter assembly 11 is made of transparent material, which allows for direct observation of the filtration status of the filter element 1102 inside the transparent filter shell 1101, making it easy to judge the filter element 1102. Whether replacement is needed; One end of the transparent filter housing 1101 is screwed onto the oil drain port 10, and the other end is screwed onto the end cap 1103. The outer side of the end cap 1103 is integrally provided with a connecting nozzle 1104. The screwed structure facilitates the disassembly and assembly of the transparent filter housing 1101 and the oil drain port 10, and the transparent filter housing 1101 and the end cap 1103, making it convenient to replace or clean the filter element 1102. The connecting nozzle 1104 facilitates the stable connection of the transparent filter housing 1101 to the external oil return pipeline, ensuring smooth oil return.

[0026] Specifically, in this embodiment, the transparent filter housing 1101 has an annular step 1107 inside, and the filter element 1102 is pressed between the annular step 1107 and the inner side of the end cap 1103.

[0027] An annular step 1107 is provided inside the transparent filter housing 1101. The filter element 1102 is pressed against the annular step 1107 and the inner side of the end cap 1103. The annular step 1107 and the end cap 1103 cooperate to effectively position and fix the filter element 1102, preventing the filter element 1102 from shifting or shaking during the return oil flow. This ensures that the filter element 1102 is always in a stable filtration position, guaranteeing the consistency and stability of the filtration effect. At the same time, it provides a clear positioning benchmark for the installation of the filter element 1102, facilitating the quick installation of the filter element 1102.

[0028] Specifically, in this embodiment, the transparent filter housing 1101 of the filter assembly 11 is made of transparent polycarbonate material with a temperature resistance of ≥120℃, and the bottom of the transparent filter housing 1101 has a manual ball valve drain port 1105; the filter element 1102 is an 80-120 mesh 304 stainless steel filter element.

[0029] The transparent filter housing 1101 of the filter assembly 11 is made of heat-resistant transparent polycarbonate material, which can adapt to the high-temperature environment during mill operation and prevent the transparent filter housing 1101 from being damaged by high temperature. At the same time, the transparency can still ensure intuitive observation of the internal filtration status. The bottom of the transparent filter housing 1101 is equipped with a manual ball valve drain port 1105. The drain port can be opened by manually operating the ball valve to promptly discharge the impurities deposited inside the transparent filter housing 1101. Impurity cleaning can be completed without disassembling the transparent filter housing 1101, reducing maintenance difficulty and improving maintenance efficiency. The filter element 1102 is made of stainless steel, which has high strength and corrosion resistance. It is not easily damaged by oil corrosion or impurity impact, extending the service life of the filter element 1102 and reducing the replacement frequency of the filter element 1102.

[0030] Specifically, in this embodiment, one end of the transparent filter housing 1101 is integrally provided with a first threaded opening 1106 that matches the oil drain port 10, and the other end of the transparent filter housing 1101 is integrally provided with a second threaded opening that matches the end cap 1103.

[0031] One end of the transparent filter housing 1101 is integrally provided with a first threaded port 1106 that matches the oil drain port 10, and the other end is integrally provided with a second threaded port that matches the end cap 1103. The integrally formed threaded port makes the connection between the transparent filter housing 1101 and the oil drain port 10, and between the transparent filter housing 1101 and the end cap 1103 tighter, reducing the risk of oil leakage. At the same time, the threaded connection method is easy to operate, making it convenient to install and disassemble the transparent filter housing 1101, and providing convenience for the subsequent replacement of the filter element 1102 and the cleaning of the transparent filter housing 1101.

[0032] Specifically, in this embodiment, the self-cleaning coated pressure-resistant glass 7 is borosilicate glass with a thickness of 8-12mm, and the surface is coated with a silica hydrophobic and oleophobic film with a water contact angle ≥110° and an oil contact angle ≥90°.

[0033] The self-cleaning coated pressure-resistant glass 7 is made of borosilicate glass, which has good pressure and temperature resistance. It can withstand the pressure and temperature changes during the operation of the mill, preventing the glass from breaking due to pressure or temperature problems and ensuring the stability of the observation window 6. The glass surface is coated with a silica hydrophobic and oleophobic film, which makes it difficult for oil and water to adhere to the glass surface, reducing oil and water stains on the glass surface, maintaining the transparency of the glass, and allowing for continuous and clear observation of the internal condition of the bearing housing 1 without frequent cleaning, reducing maintenance workload and ensuring the continuity of observation results.

[0034] Specifically, in this embodiment, the shape of the observation window 6 and the self-cleaning coated pressure-resistant glass 7 is one of a circle, a rectangle or a regular hexagon, and there are two observation windows 6 that are symmetrically distributed along the axis of the bearing 2.

[0035] The observation window 6 and the self-cleaning coated pressure-resistant glass 7 are available in various shapes, and the appropriate shape can be selected according to the installation space of the bearing housing 1 and the observation requirements, thereby improving the adaptability and flexibility of the device. The number of observation windows 6 is set to 2 and symmetrically distributed along the axis of the bearing 2, which can be used to observe the inside of the bearing housing 1 from different angles, expand the observation range, avoid blind spots, and more comprehensively grasp the lubrication status, oil quantity status and oil circuit operation of the bearing 2, and promptly detect potential problems.

[0036] Specifically, in this embodiment, there are 4-6 stainless steel socket head cap screws 9, with a strength grade of 8.8 and a tightening torque of 25-35 N·m.

[0037] The stainless steel hexagon socket head cap bolts 9 have a high strength grade and the tightening torque meets the specifications. They can firmly fix the self-cleaning coated pressure-resistant glass 7 to the observation window 6, resist the vibration during the operation of the mill, prevent the glass from loosening or falling off, ensure the sealing performance of the observation window 6, and prevent oil leakage from the observation window 6. At the same time, the high-strength bolts are not easily damaged, which extends the service life of the bolts and reduces maintenance caused by bolt problems.

[0038] Specifically, in this embodiment, the internal oil passage diameter is 8-12mm, the inner wall roughness Ra≤1.6μm, and the distance between the main oil inlet and the backup oil inlet is 10-15mm.

[0039] The internal oil passages have a low inner wall roughness, which reduces the resistance of oil flow within the passages and ensures that the oil can be smoothly delivered to the lubrication chamber of bearing 2, ensuring that bearing 2 receives sufficient lubrication. The main oil inlet and the backup oil inlet are kept at a suitable distance, which facilitates the installation and connection of the double-sealed hydraulic quick-change joint 5 and avoids mutual interference between the two oil circuits during installation and operation, ensuring the smoothness and stability of the dual oil circuit switching and further ensuring the reliable operation of the lubrication system.

[0040] In summary, the working principle of the mill visual bearing lubrication device provided in this embodiment is as follows: 1. Oil supply circulation: The external oil supply pipeline is connected to the main oil inlet (or the backup oil inlet) through the double-sealed hydraulic quick-change joint 5. The oil is delivered to the lubrication chamber of the bearing 2 through the corresponding independent internal oil passage to provide lubrication for the bearing 2. The low roughness of the inner wall of the internal oil passage can reduce the oil flow resistance and ensure that the oil reaches the lubrication chamber smoothly. 2. Oil return filtration: After lubrication, the oil flows from the lubrication chamber of bearing 2 into the drain port 10 and enters the transparent filter housing 1101 of the filter assembly 11. After impurities are filtered by the filter element 1102, the oil flows into the external oil return pipeline through the connecting nozzle 1104 on the end cover 1103, completing the oil return circulation. The annular step 1107 inside the transparent filter housing 1101 cooperates with the end cover 1103 to fix the filter element 1102 and prevent the filter element 1102 from shifting and affecting the filtration effect. 3. Visual monitoring: Through the observation window 6, key areas inside the bearing housing 1 can be observed, and the oil output from the main oil inlet can be monitored in real time to determine whether the oil film on the bearing raceway is normal, whether the oil return is smooth, and the amount of oil displayed by the raised oil level line, thus judging the operating status of the lubrication system; the self-cleaning coating can prevent oil and water stains from adhering, maintain the transparency of the glass, and ensure stable observation results. 4. Dual oil circuit switching: Under normal operating conditions, the main oil inlet supplies oil. When abnormal oil output is observed from the main oil inlet (such as no oil or poor oil flow), and it is determined that the main oil circuit is blocked or leaking, the double-sealed hydraulic quick-change connector 5 is operated to cut off the main oil circuit and connect the backup oil circuit. The backup oil inlet and the independent internal oil passage continue to supply oil to the lubrication chamber of bearing 2, achieving switching without downtime. How to use 1. Daily visual monitoring: Regularly observe the inside of bearing housing 1 through observation window 6: check whether the main oil inlet is discharging oil normally, whether the oil film on the bearing raceway is evenly covered, whether the oil return from the drain port is continuous, and whether the raised oil level line is within a reasonable range. If the oil film is found to be incomplete, the oil volume is lower than the oil level line, or the oil return is interrupted, troubleshoot the oil circuit problem in time. 2. Oil circuit switching operation: When a main oil circuit fault is observed (such as no oil in the main oil inlet), immediately operate the double-sealed hydraulic quick-change connector 5 to switch the oil supply path from the main oil inlet to the backup oil inlet. After switching, confirm through the self-cleaning coated pressure-resistant glass 7 that the backup oil inlet is supplying oil normally and the lubrication chamber of bearing 2 is supplying oil stably before arranging subsequent main oil circuit maintenance. No machine shutdown is required. 3. Filter assembly maintenance: Observe the filter element 1102 through the transparent filter housing 1101. If too many impurities are found on the surface of the filter element 1102 (affecting oil flow), first close the relevant valve of the drain port 10 (or stop the corresponding oil circuit), unscrew the end cap 1103 to remove the old filter element 1102, replace it with a new filter element 1102, and then tighten the end cap 1103 again. Open the valve to restore oil return. If impurities are deposited at the bottom of the transparent filter housing 1101, the manual ball valve drain port 1105 can be opened directly to drain the impurities. After draining, close the ball valve. 4. Regular inspection and tightening: Regularly check whether the stainless steel hex bolts 9 are loose. If they are loose, tighten them to the specified torque to prevent the self-cleaning coated pressure-resistant glass 7 from loosening or oil leakage. Check whether the screw connections between the transparent filter housing 1101 and the oil drain port 10 and the end cap 1103 are well sealed. If leakage occurs, retighten or replace the seals to ensure that the lubrication system is leak-free.

[0041] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mill visualized bearing lubrication device, comprising a bearing housing (1), a bearing (2) embedded in the bearing housing (1), and a bearing cover (3) connected with the bearing housing (1), characterized in that: The bearing cover (3) has an oil inlet (4) at the top. The oil inlet (4) includes a main oil inlet and a backup oil inlet. Both the main oil inlet and the backup oil inlet are connected to the lubrication chamber of the bearing (2) through independent internal oil passages. The main oil inlet and the backup oil inlet are connected by a double-sealed hydraulic quick-change connector (5) to achieve one-button switching of the dual oil circuits. The bearing housing (1) has an observation window (6) with a flange seat (8) on its side wall. The observation window (6) is fixedly installed with a self-cleaning coated pressure-resistant glass (7) by an oil-resistant nitrile rubber sealing ring and a stainless steel internal hex bolt (9). The observation window (6) can observe the main oil inlet oil outlet area, the bearing raceway oil film area, the oil outlet return area and the raised oil level line on the inner wall of the bearing housing (1) inside the bearing housing (1). The double-sealed hydraulic quick-change connector (5) is connected to the external oil supply line, and the bearing seat (1) is provided with an oil drain port (10) that communicates with its internal lubrication cavity. The oil drain port (10) is connected to the external oil return line.

2. The mill visual bearing lubrication apparatus of claim 1, wherein: A filter assembly (11) is connected to the oil drain port (10) of the bearing housing (1). The filter assembly (11) includes a transparent filter shell (1101) with one end screwed onto the oil drain port (10) and a filter element (1102) installed inside the transparent filter shell (1101). An end cap (1103) is screwed onto the end of the transparent filter shell (1101) away from the oil drain port (10). A connecting nozzle (1104) for connecting to an external oil return pipeline is integrally provided on the outer side of the end cap (1103).

3. The mill visual bearing lubrication apparatus of claim 2, wherein: The transparent filter housing (1101) has an annular step (1107) inside, and the filter element (1102) abuts against the annular step (1107) and the inner side of the end cap (1103).

4. The mill visual bearing lubrication apparatus of claim 2, wherein: The filter housing (1101) of the filter assembly (11) is made of transparent polycarbonate, and the bottom of the transparent filter housing (1101) has a manual ball valve drain port (1105); the filter element (1102) is an 80-120 mesh 304 stainless steel filter element.

5. The mill visual bearing lubrication apparatus of claim 2, wherein: One end of the transparent filter housing (1101) is integrally provided with a first threaded opening (1106) that matches the oil drain port (10), and the other end of the transparent filter housing (1101) is integrally provided with a second threaded opening that matches the end cap (1103).

6. The mill visual bearing lubrication apparatus of claim 1, wherein: The self-cleaning coated pressure-resistant glass (7) is borosilicate glass with a thickness of 8-12mm, coated with a silica hydrophobic and oleophobic film, with a water contact angle ≥110° and an oil contact angle ≥90°.

7. A mill visual bearing lubrication apparatus according to claim 6, characterized in that: The shape of the observation window (6) and the self-cleaning coated pressure-resistant glass (7) is one of a circle, a rectangle or a regular hexagon. There are two observation windows (6) and they are symmetrically distributed along the axis of the bearing (2).

8. The mill visual bearing lubrication apparatus of claim 1, wherein: The number of stainless steel internal hex bolts (9) is 4-6, with a strength grade of 8.8 and a tightening torque of 25-35 N·m.

9. A mill visual bearing lubrication arrangement according to any of claims 1-8, characterized in that: The internal oil passage has a diameter of 8-12 mm, an inner wall roughness Ra≤1.6 μm, and a distance of 10-15 mm between the main oil inlet and the backup oil inlet.

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