BALL MILL Russian patent published in 1994 - IPC

FIELD: chemical, mining, construction and other industries; dispersing devices. SUBSTANCE: ball mill has vertical housing, separator fitted on shaft concentrically relative to housing and with clearance and made in form of disks installed on shaft and bushings placed between disks. Bushings have ribs on side surfaces. Mill has also freely fitted balls. Maximum clearance between bushing and housing is greater than diameter of ball, but is less than 1.7 diameter of ball. Bushings are installed relative to disks with clearance greater than diameter of ball, but less than 1.7 diameter of ball so that space of bushing communicates with clearance. Ribs of bushing are made at angle greater than zero but less than 30 degrees relative to its side surface generatrix. Flats of ribs pointed in direction of rotation include sections on which angle between normal and radius drawn through the point of section surface in cross-section of rib increases in direction towards its vertex. Section of rib flat can be made flat or concave, and each flat can include one or several sections. On adjacent sections, angle between normal and radius passing through middle of section decreases in direction to rib apex. Bushings can be provided with flexible bandages. EFFECT: increased efficiency of grinding and activation of materials, increased service life of mill. 6 cl, 7 dwg