GRAIN COMBINE HARVESTER Russian patent published in 2017 - IPC A01D41/02 A01F7/06 

FIELD: agriculture.

SUBSTANCE: combine harvester includes a header, an inclined chamber, a threshing-separating unit equipped with a receiving screw device, and an air blower. The threshing-separating unit is arranged in the form of an external, middle and internal helical drums coaxially arranged with a clearance. The external drum is made with forming a multi-thread helical surface along the perimeter of three or more vertically folded and successively connected strips of variable width of the convex curved shape. The middle drum is mounted from sections made of an even number of equilateral perforated triangles connected to each other by lateral sides, with forming a multi-thread helical surface. The sections are connected to each other by free third sides of the triangles with forming a helical drum. Along the perimeter of the helical drum, there are broken right and left helical lines arranged opposite to each other. The internal helical drum is made tapered and is mounted from sections connected one-by-one along the length of the helical drum.

EFFECT: increased operation efficiency.

29 dwg