GRAIN-CLEANING MACHINE Russian patent published in 1998 - IPC

FIELD: cleaning and grading grain. SUBSTANCE: machine includes three tiers of screens, before-screen aspiration channel with air flow rate control mechanism, two after-screen aspiration channels with grain inlet devices and mechanisms for control of air flow rate in channels which are connected with settling chambers, grain mixture inlet device, waste outlet device and clean grain outlet device. Middle tier outlet is brought in communication with grain mixture inlet device of first channel of after-screen aspiration; lower tier outlet is brought in communication with grain inlet device of second channel of after-screen aspiration. EFFECT: enhanced efficiency of cleaning due to control of air flow rate in channels. 1 dwg