THE STUDY OF THE PROCESS OF GRAIN MATERIAL SELF-GRADING
During mechanized harvesting, in addition to the grain of the main crop, the heap contains various foreign particles (small and large) as well as unthreshed, crushed, injured and thin grain. The source material of such composition, as a rule, is loaded into the intake pits of grain cleaning and drying plants. Already at this stage, self-grading occurs during the movement of grain material along the slopes of the intake pit. The self-grading process is of the greatest interest at the separation of bulk grain materials on various working surfaces of grain cleaning machines. The analysis of the existing studies shows that the improvement of the technological process of centrifugal cleaning screens in the separation of fine impurities should be carried out in the direction of intensification of the two-stage model of bulk material separation.