MILLING FITTINGS OF DISC MILL Russian patent published in 2009 - IPC B02C7/12 

FIELD: technological processes.

SUBSTANCE: invention concerns constructive elements of disc mills. Milling fittings include stator disc with inlet hole and rotor disc, both assembled of sectors and featuring central and peripheral ring zones with cutters and inter-cutter grooves and acceleration zone on their operational surface. Each disc sector is limited by radiuses forming central angle of 45°, cutters of each sector are positioned in three groups separated by through slots. Central group cutters on rotor disc are set parallel to a cutter positioned along guiding line turned against disc rotation direction at 17-23° angle in the cross-point of concentric circle of radius equal to 0.7 of external disc radius, with a straight line drawn from the disc centre at 9-14° angle to vertical rotor disc axis directed along rotation direction. Central sector line separates central cutter group into left and right parts, so that left cutter group is a copy of the right part of central cutter group turned by a half of the central sector angle. Right cutter group is a copy of the left part of central cutter group turned by a half of the central sector angle. Lengthwise axis of through slots of sector is parallel to the previous sector cutter group along the rotation direction. Central group cutters on stator disc are set parallel to a cutter positioned along guiding line turned against material flow direction at 2-5° angle in the cross-point of concentric circle of radius equal to 0.7 of external disc radius, with a straight line drawn from the disc centre at 9-14° angle to vertical rotor disc axis directed along material flow direction. Central sector line separates central cutter group into left and right parts. Left cutter group is a copy of the right part of central cutter group turned by a half of the central sector angle, and right cutter group is a copy of the left part of central cutter group turned by a half of the central sector angle. Lengthwise axis of through slots of sector is parallel to the previous sector cutter group along the material flow direction. Central ring zone of each sector has indents distributed at regular interval along concentric circle and connected to acceleration zone and inter-cutter grooves. Each indent has trapeze form with larger base directed to the disc centre. Side walls of each indent have cross-section in the form of a wedge with its top directed towards disc periphery.

EFFECT: enhanced efficiency of disc mill, reduced energy cost of milling.

2 cl, 9 dwg