Abstract
The article presents theoretical and experimental studies on the feasibility of using the fractionation process in post-harvest grain processing. The main signs of the separation of winter wheat heap are determined. It is established that these signs of separation have a correlation. For each thickness of the grains, a certain speed of soaring in the air channel can be set, which will allow to isolate the feed fraction not only by sieves, but also by an aspiration system. The theoretical yield fractions of the main and feed fractions were determined under various conditions. It was found that when the separation on the spike and sowing sieves is 0.8 and the air flow rate in the second suction channel is 7.0 m / s, as well as the width of the sorting sieve opening is increased from 2.0 to 2.6 mm, the yield of the main fraction decreases from 0.94 to 0.75. In general, theoretical studies have shown that to obtain high-quality seeds of winter wheat, it is necessary to install sorting sieve sheets with oblong apertures of 2.6 mm in the separators and adjust the air flow velocity in the second suction channel of 7 … 8 m / cm.
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