FIELD: devices for sieving loose materials by fractions. SUBSTANCE: device includes intake unit, screw feeder, set of cylindrical sieves, set of units for discharge of sieved materials; the following units are mounted over entire length of outer generatrix of screw feeder: T-shaped scraper provided with flexible member made from rubber, for example, at stiffness varying in height with triangular section at acute apex angle; apex is directed towards sieves; sweeping brush located immediately after flexible member over entire length; in way of motion of material being sieved it has length of 10 to 20 mm and projecting above flexible member by to 3 mm. EFFECT: enhanced efficiency of sieving loose materials by fractions. 3 dwg
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