DIRECT FEED SCREEN Russian patent published in 2013 - IPC B07B1/22 

FIELD: process engineering.

SUBSTANCE: invention relates to loose material classification and may be used in metallurgy, construction, chemical industry, etc. Direct feed screen comprises sieving surface, drive, loader and unloader. Said sieving surface represents multistart hollow surface composed of three and more rectangular strips coiled in vertical plate in lengthwise direction and curved in helical lines in transverse direction at cylindrical mandrel to form helical lines and helical curvilinear surfaces along perimetre in the form of helical channels of concave or convex shape relative to sieving surface mirror axis with centers of curvature located outside or onside sieving surface cross-section. Sieving surface can be composed of three and more helical perforated strips convexed or concaved relative to sieving surface rotational surface that feature different order and magnitude of curvature relative to said axis with centers located inside or outside cross-section of sieving surface. Helical spring with device to vary turn pitch by spring compression or expansion is arranged along container length.

EFFECT: higher intensity of mixing.

11 dwg