A lubrication structure for grinding rollers in a steel slag vertical mill

Abstract

This utility model relates to the field of rolling bearing technology, specifically a lubrication structure for a steel slag vertical mill grinding roller, including an outer roller sleeve, a main shaft, a first bearing, a second bearing, and a metal sleeve; the outer roller sleeve is provided with a sealing end cap; one end of the main shaft extends into the outer roller sleeve, and the other end is provided with an oil injection pipe and an oil return pipe; the outer roller sleeve seals the main shaft through the sealing end cap; a sealed cavity is formed between the main shaft, the outer roller sleeve, and the sealing end cap; when the entire vertical mill grinding roller lubrication system fails, the oil stored in the sleeve will flow out to lubricate and cool the bearing, compensating for the existing lubrication system and effectively improving the service life of the vertical mill grinding roller bearing.

Description

Technical Field

[0001] This utility model relates to the field of rolling bearing technology, specifically a lubrication structure for the grinding roller of a steel slag vertical mill. Background Technology

[0002] The basic lubrication solution for grinding rollers in the industry involves an oil injection pump pressurizing and injecting oil into multiple oil injection holes on the end face of the grinding roller spindle, while a return oil pump draws oil from multiple return oil holes on the end face of the grinding roller spindle. Through the return oil pump, the bearings in the grinding roller are lubricated, cooled, and flushed.

[0003] The operating conditions of steel slag vertical mills are harsh, and the bearings are subjected to very large impact and vibration loads, so the bearings often experience temperature rise. At the same time, steel slag vertical mills commonly suffer from poor oil return in the grinding roller lubrication system during field use. As the bearing operating temperature rises, the internal air pressure of the grinding roller increases, leading to oil leakage from the sealing end cap. Once the oil leaks, the oil circulation in the lubrication system stops, which will have a detrimental effect on the bearing life. Utility Model Content

[0004] In view of the deficiencies of the prior art, this utility model provides a lubrication structure for the grinding roller of a steel slag vertical mill. When the entire vertical mill grinding roller lubrication system fails, the oil stored in the sleeve will flow out to lubricate and cool the bearing, compensate for the existing lubrication system, and effectively improve the service life of the vertical mill grinding roller bearing.

[0005] To achieve the above objectives, the present invention provides a lubrication structure for a grinding roller of a steel slag vertical mill, comprising an outer roller sleeve, a main shaft, a first bearing, a second bearing, and a metal sleeve; the outer roller sleeve is provided with a sealing end cap; one end of the main shaft extends into the outer roller sleeve, and the other end is provided with an oil injection pipe and an oil return pipe; the outer roller sleeve seals the main shaft through the sealing end cap; a sealed cavity is formed between the main shaft, the outer roller sleeve, and the sealing end cap; the oil injection pipe connects from the end face of the main shaft to one side of the sealed cavity, and the oil return pipe connects from the end face of the main shaft to the other side of the sealed cavity, so that the lubricating oil in the pipes flows from the oil injection pipe to the sealed cavity and back from the sealed cavity to the oil return pipe, forming a lubrication circulation system; the first bearing is disposed between the outer roller sleeve and the main shaft; the second bearing is disposed between the outer roller sleeve and the main shaft; and the metal sleeve is disposed between the first bearing and the second bearing.

[0006] Furthermore, the metal sleeve is filled with 50L of lubricating oil, and the viscosity of the lubricating oil in the metal sleeve is higher than that of the lubricating oil in the oil injection pipe and the oil return pipe.

[0007] Furthermore, the metal sleeve is made of cold-rolled steel plate with a thickness of 15mm.

[0008] Furthermore, a pressure pump is installed near the oil injection pipe to prevent the lubricating oil inside the metal sleeve from participating in the circulation of the oil.

[0009] Furthermore, an inner spacer is provided between the inner ring of the first bearing and the inner ring of the second bearing.

[0010] Furthermore, an outer spacer is provided between the outer ring of the first bearing and the outer ring of the second bearing.

[0011] Furthermore, the metal sleeve is fitted over the inner spacer, and the metal sleeve is fixed to the inner spacer by spot welding.

[0012] Furthermore, the first bearing is a single-row cylindrical roller bearing.

[0013] Furthermore, the second bearing is a double-row tapered roller bearing.

[0014] The method of using the aforementioned lubrication structure for the grinding rollers of a steel slag vertical mill includes the following steps: S100. When the lubrication circulation system is working normally, the working temperature of the grinding roller is below 90℃, the single-sided gap of the metal sleeve is 0.025mm, the viscosity of the lubricating oil in the metal sleeve is 210mm^2 / s, the pressure pump provides a pressure of 1Mpa, keeping the lubricating oil in the metal sleeve from participating in the lubrication circulation system, the oil injection pipe supplies oil, which flows through the sealed cavity to the return oil pipe to lubricate the first and second bearings. S200 When the lubrication circulation system fails, the working temperature of the grinding roller is above 120℃, the single-sided gap of the metal sleeve is 1.5mm, the viscosity of the lubricating oil in the metal sleeve decreases to 35mm^2 / s, the pressure pump continuously pumps pressure into the sealed cavity, and the lubricating oil in the metal sleeve flows out through the gap to lubricate the first and second bearings.

[0015] The beneficial effects of this utility model are as follows: This application is used for the grinding roller of a cement steel slag vertical mill. In the prior art, double-row tapered roller bearings and cylindrical roller bearings are used in pairs, and multiple oil inlet holes are set on the end face of the main shaft of the grinding roller for lubrication, cooling and flushing of the grinding roller bearings. However, this application uses a metal sleeve filled with lubricating oil placed between the cylindrical roller bearings and the double-row tapered roller bearings. When the entire vertical mill grinding roller lubrication system fails, the oil stored in the sleeve will flow out to lubricate and cool the bearings, compensate for the existing lubrication system, and effectively improve the service life of the vertical mill grinding roller bearings. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; In the diagram: 100, outer roller sleeve; 110, sealing end cap. 200. Spindle; 210. Oil injection pipe; 220. Oil return pipe; 230. Sealed cavity. 300. First bearing, 400. Second bearing. 500. Metal sleeve. 600. Pressure pump 700, inner spacer ring, 800, outer spacer ring. Detailed Implementation

[0017] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0018] like Figure 1 As shown, in one embodiment of this utility model, a lubrication structure for a grinding roller of a steel slag vertical mill includes an outer roller sleeve 100, a main shaft 200, a first bearing 300, a second bearing 400, and a metal sleeve 500. The outer roller sleeve 100 is provided with a sealing end cap 110. One end of the main shaft 200 extends into the outer roller sleeve 100, and the other end is provided with an oil injection pipe 210 and an oil return pipe 220. The outer roller sleeve 100 seals the main shaft 200 through the sealing end cap 110. A sealed cavity 230 is formed between the main shaft 200, the outer roller sleeve 100, and the sealing end cap 110. The oil injection pipe... The oil return pipe 210 connects to one side of the sealed cavity 230 from the end face of the main shaft 200, and the oil return pipe 220 connects to the other side of the sealed cavity 230 from the end face of the main shaft 200, so that the lubricating oil in the pipes flows from the oil injection pipe 210 to the sealed cavity 230 and back from the sealed cavity 230 to the oil return pipe 220, forming a lubrication circulation system; the first bearing 300 is disposed between the outer roller sleeve 100 and the main shaft 200; the second bearing 400 is disposed between the outer roller sleeve 100 and the main shaft 200; and the metal sleeve 500 is disposed between the first bearing 300 and the second bearing 400.

[0019] In one embodiment, the metal sleeve 500 is filled with 50L of lubricating oil, and the viscosity of the lubricating oil in the metal sleeve 500 is higher than the viscosity of the lubricating oil in the oil injection pipe 210 and the oil return pipe 220.

[0020] It should be noted that the lubricating oil inside the metal sleeve 500 has a very high viscosity, above VG680, while the lubricating oil in the lubrication circulation system is around VG220, which is much higher than the viscosity of the lubricating oil used in normal circulating oil lubrication. In addition, the thin oil lubrication system has a pressure pump 600, which pressurizes the oil in the sleeve to prevent it from flowing out as much as possible.

[0021] In one embodiment, the metal sleeve 500 is made of cold-rolled steel plate with a thickness of 15mm.

[0022] In one embodiment, a pressure pump 600 is provided near the oil injection pipe 210 to keep the lubricating oil in the metal sleeve 500 from participating in the circulation of the circulating oil.

[0023] In one embodiment, an inner spacer 700 is provided between the inner ring of the first bearing 300 and the inner ring of the second bearing 400.

[0024] In one embodiment, an outer spacer 800 is provided between the outer ring of the first bearing 300 and the outer ring of the second bearing 400.

[0025] In one embodiment, a metal sleeve 500 is fitted over the inner spacer 700, and the metal sleeve 500 is fixed to the inner spacer 700 by spot welding.

[0026] In one embodiment, the first bearing 300 is a single-row cylindrical roller bearing.

[0027] In one embodiment, the second bearing 400 is a double-row tapered roller bearing.

[0028] A method for using a lubrication structure for the grinding rollers of a steel slag vertical mill includes the following steps: S100 When the lubrication circulation system is working normally, the temperature of the grinding roller is 60~80℃. The pressure pump 600 provides a pressure of 1Mpa to keep the lubricating oil in the metal sleeve 500 from participating in the lubrication circulation system. The oil injection pipe 210 supplies oil, which flows through the sealed cavity 230 to the return oil pipe 220 to lubricate the first bearing 300 and the second bearing 400. It should be noted that during normal operation, the thermal expansion of the metal sleeve 500 is 0.1 mm, and the thermal expansion of the inner spacer 700 is 0.075 mm; the single-sided clearance of the metal sleeve 500 is 0.25 mm; the lubricating oil used in the lubrication circulation system is VG220 with a viscosity of 60 mm^2 / s; the lubricating oil inside the metal sleeve 500 is VG680 with a viscosity of 210 mm^2 / s.

[0029] S200. When the lubrication circulation system fails, the temperature inside the grinding roller will continue to rise, reaching above 120°C. The pressure pump 600 continuously pumps pressure into the sealed cavity, causing the thermal expansion of the metal sleeve 500 to be greater than that of the inner spacer 700. This results in a single-sided gap of 1.5mm in the metal sleeve 500. At this time, the viscosity of the lubricating oil inside the metal sleeve 500 decreases to 35mm^2 / s. The lubricating oil inside the metal sleeve 500 flows out through the gap to lubricate the first bearing 300 and the second bearing 400. When the failure occurs, the internal pressure will be briefly higher than the normal pressure by 1MPa, and then gradually become the same as the external atmospheric pressure by 0.1MPa.

[0030] It should be noted that when failure occurs, the thermal expansion of the metal sleeve 500 is 1.6 mm, and the thermal expansion of the inner spacer 700 is 0.1 mm; the single-sided clearance of the metal sleeve 500 is 1.5 mm, and the viscosity of the lubricating oil inside the metal sleeve 500 is 35 mm^2 / s.

[0031] The aforementioned lubrication structure for the grinding rollers of a steel slag vertical mill involves filling a metal sleeve 500 with 50L of lubricating oil. The viscosity of the lubricating oil added to the metal sleeve 500 must be higher than that of the lubricating oil in the lubrication system. This metal sleeve 500 is made of cold-rolled steel plates, welded together, and is 15mm thick. It uses a transition fit with the inner spacer 700 and is fixed to the inner spacer 700 by spot welding in the circumferential direction. When the lubrication system is operating normally, the oil injection pump pressurizes the lubricating oil in the metal sleeve 500, keeping it within the sleeve and preventing it from circulating. If the lubrication system fails, the oil circulation stops, but the return pump continuously draws from the internal cavity of the grinding roller, reducing the pressure. At this point, the high-viscosity grease stored in the metal sleeve 500 flows out to lubricate the bearing. Due to its high viscosity, the lubricating oil stored in the metal sleeve 500 gradually flows out and participates in the bearing's operation. Calculations show that there is a safe time of more than 5 hours from the outflow of the grease until it is completely discharged from the grinding roller. This time provides significant time redundancy for on-site equipment maintenance, ensuring the bearing's operating condition, preventing bearing temperature rise, and forming a good lubricating oil film, effectively extending the bearing's service life and preventing bearing seizure and production stoppage.

[0032] Since the internal temperature of the grinding roller may reach above 100℃ during operation, the metal sleeve 500 and the inner spacer 700 will be displaced. Therefore, H7 and js6 transition fit are adopted. Several welding points are evenly distributed in the circumferential direction of the metal sleeve 500 to fix the metal sleeve 500 and the inner spacer 700.

[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "above," "below," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

Claims

1. A lubricating structure for a steel slag vertical mill roller, characterized in that: include The outer roller sleeve is equipped with a sealing end cap; The main shaft extends into the outer roller sleeve at one end, and is provided with an oil injection pipe and an oil return pipe at the other end; the outer roller sleeve seals the main shaft through a sealing end cap; a sealed cavity is formed between the main shaft, the outer roller sleeve, and the sealing end cap; the oil injection pipe connects from the end face of the main shaft to one side of the sealed cavity, and the oil return pipe connects from the end face of the main shaft to the other side of the sealed cavity, so that the lubricating oil in the pipes flows from the oil injection pipe to the sealed cavity and back from the sealed cavity to the oil return pipe, forming a lubrication circulation system; A first bearing is disposed between the outer roller sleeve and the main shaft; The second bearing is disposed between the outer roller sleeve and the main shaft; A metal sleeve is disposed between the first bearing and the second bearing.

2. The lubrication structure for the grinding roller of a steel slag vertical mill according to claim 1, characterized in that: The metal sleeve is filled with 50L of lubricating oil. The viscosity of the lubricating oil in the metal sleeve is higher than that of the lubricating oil in the oil injection pipe and the oil return pipe. The viscosity of the lubricating oil in the metal sleeve is 210mm^2 / s. The viscosity of the lubricating oil in the lubrication circulation system is 60mm^2 / s.

3. The lubrication structure for the grinding roller of a steel slag vertical mill according to claim 1, characterized in that: The metal sleeve is made of cold-rolled steel plate with a thickness of 15mm.

4. The lubrication structure for the grinding roller of a steel slag vertical mill according to claim 1, characterized in that: A pressurizing device is installed near the oil injection pipe to prevent the lubricating oil in the metal sleeve from participating in the circulation of the oil.

5. The lubrication structure for the grinding roller of a steel slag vertical mill according to claim 1, characterized in that: An inner spacer is provided between the inner ring of the first bearing and the inner ring of the second bearing.

6. The lubrication structure for the grinding roller of a vertical mill for steel slag according to claim 1, characterized in that: An outer spacer is provided between the outer ring of the first bearing and the outer ring of the second bearing.

7. The lubrication structure for the grinding roller of a steel slag vertical mill according to claim 3, characterized in that: The metal sleeve is fitted over the inner spacer and is fixed to the inner spacer by spot welding.

8. The lubrication structure for the grinding roller of a steel slag vertical mill according to claim 1, characterized in that: The first bearing is a single-row cylindrical roller bearing.

9. The lubrication structure for the grinding roller of a steel slag vertical mill according to claim 1, characterized in that: The second bearing is a double-row tapered roller bearing.

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