BALL MILL Russian patent published in 1994 - IPC

FIELD: construction, mining and other branches of industry. SUBSTANCE: mill has drum 1 whose inner surface is protected by plates 2 with wavy profile of working surface. Plates secured on drum form working surface in form of spiral projections 3 and cavities 4. Projections and cavities are arranged on drum so that their longitudinal generating line is at angle of 15-23 degrees to generating line of drum cylindrical surface. Depth and width of projections and cavities are equal to 0.6-0.7 of medium diameter of milling ball. EFFECT: enlarged operating capabilities. 3 dwg