GRAIN COMBINE CLEANER Russian patent published in 1994 - IPC

FIELD: agricultural engineering, in particular, combine construction. SUBSTANCE: grain combine cleaner has conveyance boards arranged in tiers and provided with finger combs. Lower conveyance board has screen with adjustable openings. One diffuser of fan is disposed at a location, where heap exits from upper conveyance board onto lower conveyance board. Screens are positioned behind other diffuser of fan. Fan is made of axial flow- type with independent drive. Diffusers of fan have common base and are made rectilinear. Lower wall of upper diffuser and upper wall of lower diffuser are connected through shield inclined downward in the direction opposite to combine travel direction. Lower conveyance board is made in the form of regulatable screen. EFFECT: increased efficiency of cleaner and reduced loss of grain by increased usable area of screens providing double-staged stirring of heap and sieving-out light contaminants. 2 cl, 1 dwg