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Abstract

During the coal grinding vertical roll mill operating the deterioration process of one’s working bodies such as grinding rolls and blends bowl running track is characterized both the working bodies movement and one’s interaction with coal during the coal fragment’s destruction, and the grinding rolls pressing force to the running track, which leads to different types of slippage. The running race and grinding rolls mutual motion analytical investigations have been presented in this article taking to account the elastic and geometric types of slippage. According to the results of the investigations the mill working bodies efficiency conditions have been established for the considered types of slippage, when the one’s uniform wear takes place, it increases the quality of the final product – the coal grinding fineness. Key words: grinding rolls, running track, mill, geometrical and elastic slippage, efficiency