GRAIN CLEANING MACHINE Russian patent published in 2002 - IPC

FIELD: agricultural engineering. SUBSTANCE: machine has charging device, grain mixture feeding device, screens arranged in three tiers, aspiration channel positioned forward of screens and equipped with air speed regulating mechanism, two aspiration channels positioned rearward of screens and equipped with air speed regulating mechanisms, grain fraction discharge device and waste discharge device, double-flow bucket elevator, wild-oat cylinder and cocoon cylinder. Both aspiration channels positioned rearward of screens are communicated through grain feeding devices with middle and lower screen tier discharge ends. Lower end of first flow of bucket elevator is communicated with large-size grain discharge device. Upper end of first flow of bucket elevator is communicated through grain guides and grain flow change-over device with inlet branch pipes of cocoon and wild-oat cylinders and with large-size clean grain discharge device. Lower end of second flow of bucket elevator is communicated with small-size grain fraction discharge device and its upper end is communicated through grain guides and grain flow change-over device with inlet and outlet branch pipes of cocoon cylinder. Outlet branch pipe of cocoon cylinder is communicated through grain flow change-over device with inlet branch pipe of wild-oat cylinder and with clean small-size grain discharge device. EFFECT: increased efficiency in removal of elongated and short contaminants from grain and simplified construction. 1 dwg