BALL MILL Russian patent published in 2001 - IPC

FIELD: fine disintegration of materials. SUBSTANCE: ball mill includes drum with charging and discharging portions; in both portions there are double-start screw devices made of rods and turned one relative to another by 180 degrees. Rods of double-start screw devices are mounted in openings of round stem placed one near another in special lining rings and forming screw lining with preferable leading angle equal to 10-20 degrees and with direction of helical surfaces coinciding with that of helical line of respective screwdevice. Trapezoidal plates are arranged between said rods at their working side; plates mounted on rods of screw device have openings. Level of arranging plates is limited by maximum gap between rods that is no more than weighted mean diameter of milling bodies. Air supply branch pipes are secured to rods of screw device arranged in charging portion of mill on its non-working surface. Air supply branch pipes have openings for feeding aspiration air to disintegration chamber of mill; said openings are matched with openings arranged on surface of plates along helix and oriented along rods to side of discharging portion of mill. EFFECT: intensified milling process, reduced overgrinding degree of milled material. 2 cl, 4 dwg