GRAIN THRESHING METHOD AND APPARATUS Russian patent published in 2002 - IPC

FIELD: agriculture. SUBSTANCE: method involves wetting grain with liquid and acting upon grain with compression force applied by first pair of rolls so as to change internal core structure; feeding grain onto second pair of rolls and providing threshing; providing further threshing by means of following pairs of rolls and/or sieving threshing products so that flour is substantially obtained as end product. Grain is wetted so that grain coat has higher moisture content than grain core. Along with compression force, shearing force is applied to grain by pair of rolls. Rolls of second pair of rolls have outer grooved surface. Apparatus has wetting device, first pair of rolls located rearward of wetting device, at least one pair of rolls arranged directly behind first pair of rolls and adapted for grain threshing, and at least one planar sieve arranged behind second pair of rolls. Rolls of first pair of rolls are designed for acting upon grain by compression and shearing forces. One roll has smooth or almost smooth outer surface. Other roll has grooved outer surface. Pair of rolls arranged directly behind first pair of rolls has rolls with grooved surface. At least one following pair of rolls and/or at least one cutting mill are positioned behind second pair of rolls. Method and apparatus provide flour yield of more than 75%. EFFECT: increased efficiency, improved quality of threshed grain by reduced damage to grain coat and increased yield of flour. 49 cl, 13 dwg