Oil film bearing bush for plate and strip rolling mill

Abstract

The invention relates to an oil film bearing bush for a plate and strip rolling mill, and relates to an oil film bearing for a rolling mill support roller. By the oil film bearing bush, the problem of how to improve the service life of the oil film bearing of the conventional plate and strip rolling mill is solved. The oil film bearing bush comprises a static pressure lubricating oil inlet channel formed along the axial direction of the bush, a static pressure lubricating oil inlet hole which is communicated with the oil inlet channel, static pressure oil cavities which are communicated with the oil inlet hole and are formed on the inner surface of the bush, a dynamic pressure oil cavity which is formed on the inner surface of the bush along the axial direction, a dynamic pressure lubricating oil inlet hole which is communicated with the dynamic pressure oil cavity and working surfaces which are partitioned by the dynamic pressure oil cavity, wherein the dynamic pressure oil cavity isa circumferential narrow oil cavity, and an opening angle of the oil cavity is less than or equal to 10 degrees; the static pressure oil cavities are three rows of narrow oil cavities which are symmetrical axially and are distributed uniformly in the circumferential direction; and the working surfaces are three, and wrap angles in a working area are 110 degrees. The oil film bearing bush is suitable for various large-scale modern rolling mills for middle plates, thick plates, ultra-thick plate, wide and thick plates, hot tandem rolling, cold tandem rolling and the like.

Description

technical field [0001] The invention relates to a basic part of a large rolling mill, in particular to an oil film bearing of a backup roll of a plate and strip mill. Background technique [0002] Oil film bearing is a kind of sliding bearing, but when working, it can form a complete bearing oil film between the shaft and the bearing, completely separate the shaft and the bearing surface, and cause pure liquid friction. [0003] In the early 1930s, dynamic pressure oil film bearings were used on rolling mills, and received very good results; in the 1950s, static pressure was added, which was even more powerful: the bearing capacity was improved, the rolling accuracy was improved, and the In addition, it has undergone many structural improvements... In the 1970s, whether the rolling mill was equipped with oil film bearings became a sign of the installed capacity. [0004] Although the rolling mill oil film bearing has been perfected for more than half a century, it fully mee...

AI Technical Summary

Problems solved by technology

Obviously, the problem existing in the current bushing design is the inversion of the main and auxiliary functions: one is: the actual working area of ​​the oil film bearing bushing of the plate and strip mill is the main function, and its wrap angle is 120°, while The dynamic pressure lubricating oil chamber is only an auxiliary function to supply the dynamic pressure lubricating oil to the bearing, and the sum of their wrapping angles is 120°; the second is: the supporting angle of the working area of ​​the oil film bearing bush of the plate and strip mill is not more than Baidu (theoretical wrapping angle α ≤100°), but the current 120° should be slightly surplus, and it is too extravagant to make the wrap angle of the two dynamic pressure lubricating oil chambers to 120° so far

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