Patent ID: 6296124
Filing Date: 2001-10-02
Classification: B07B

Abstract:
A screening device having a screening floor for collecting bulk materials comprising:a plurality of shafts disposed above the screening floor, aligned parallel with each other, and having a distance ""t"" between the axis of rotation of adjacent shafts, wherein said plurality of shafts rotate at the same speed in the same direction;screening stars (2, 2', 2"") mounted on said plurality of shafts, said screening shaft being spaced apart on said shafts and wherein said screening shaft of adjacently mounted parallel shafts interleave with each other to define a gap therebetween, each of said screening stars comprises:a plurality of equally spaced apart teeth, defined by a tooth trough (5) and a tooth tip, and formed on the periphery, said teeth projecting radially in relation to said plurality of shafts, each of said plurality of teeth comprising a leading tooth flank (7, 7') extending from said tooth trough (5) to the tip in a direction opposite to the direction of rotation; each leading tooth flank having a straight section (9, 9') adjacent the tip extending in a straight line, and wherein said screening stars have a diameter ""d"" determined by ##EQU5##so that an angle of 90 degrees is formed between straight sections of leading tooth flanks of adjacent screening stars to eject an oversized particle from the tooth trough of one of said screening stars.