GRAIN COMBINE HARVESTER Russian patent published in 2014 - IPC A01D41/00 A01F7/06 

FIELD: agriculture.

SUBSTANCE: grain combine harvester comprises a header, a feed elevator, a blower and threshing and separation unit, which is made in the form of screw drums coaxially mounted with a gap, for example three, the outer, middle and inner. The inner drum is made to form on the inner perimeter of directed towards each other three or more polygonal right and left helical lines, as well as inner three or more helical grooves with the same pitch of the sections mounted of two subsections, which are made from three or more perforated isosceles trapezoids and perforated isosceles triangles serially interconnected with lateral sides. The bases of the triangles in the subsection are located in different directions. The sections are interconnected with large bases of the perforated trapezoids, and the subsections are connected to the section so that the bases of the isosceles perforated triangles of one subsection are attached to the upper base of the isosceles perforated trapezoids of the second subsection. The bases of the isosceles perforated triangles of the second subsection are attached to the upper base of the isosceles perforated trapezoids of the first subsection. Along the entire length of the inner drum the cylindrical spring is mounted with a flat section of coils and the direction of coils, which can coincide or be opposite the direction of rotation of the screw drum. The spring is equipped with a device for changing the pitch of the coils by its expansion or contraction.

EFFECT: use of the present invention enables to expand the technological capabilities of the combine at simplifying its structure.

25 dwg