PRESS-ROLL GRINDER Russian patent published in 1998 - IPC

FIELD: treatment of small-sized and powder-like materials. SUBSTANCE: grinder has bunker with distributing device positioned above pair of rolls arranged close to each other. Rolls are provided with convex and concave parallel surfaces which have transverse and longitudinal projections. Distributing device is made as diamond-shaped packing appliance with walls hinged to each other and coupled kinematically to source of vibration oscillations. Packing device is secured to bunker walls with clearance between rolls and bunker lower walls decreasing downwards. Lower walls may be made curvilinear with transverse channeling. In this case, curvature radii are equal to sum of roll radii and clearances between roll and diamond-shaped packing device. Values of clearance in lower and upper parts of curvilinear surface of diamond-shaped packing device may have relation of (0.5-0.8):1. Arc-shaped deagglomerating device with deflecting wedge in upper part and device which returns ungrounded material to interroll space are mounted under rolls. Part of deagglomerating device located under wedge may be made of separate cylindrical elements. EFFECT: higher degree of material grinding, reduced wear of grinder operating members. 3 cl, 5 dwg