TOROIDAL SCREEN FOR FRACTIONATING OF LOOSE MATERIALS Russian patent published in 2012 - IPC B07B1/28 

FIELD: process engineering.

SUBSTANCE: invention relates to screening rocks and construction materials, crushing and sorting jobs, and screen sizing of construction materials. Proposed screen comprises sieving surface, drive, loading and unloading appliances. Said sieving surface is arranged elastically on bed, furnished with vibrator and made up of torus with curved perforated surface along inner edges consisting of curved pockets. Said case consists of sections, each being made up of round sector composed of band to make different-size quadrangles with two parallel crease edges spaced apart in parallel. Perforated band is coiled into ring curved pockets arranged along its edges while sections are interconnected by free sides of said quadrangles to screw lines and inner screw perforated surface on outer sieving surface directed in one direction at acute angle to sieving surface axis that are made up of different-size-and-shape pockets. Distances between crease edges are identical and equal to the sum of lengths of perimetres of inner perforated surface pocket geometrical figures.

EFFECT: expanded performances and higher efficiency.

9 dwg