DETERMINATION OF THE BASIC DESIGN AND TECHNOLOGICAL PARAMETERS OF THE PNEUMATIC SEPARATING DEVICE OF A CLOVER THRESHER AND SCARIFIER

The most labor-intensive stages of the post-harvest processing of grass seeds are their extracting and cleaning from impurities. For extracting seeds from the hull of clover and other leguminous and cereal grasses, as well as scarification of solid seeds of leguminous grasses, the clover thresher and scarifier KS-0.2 has been developed. It lacks a device for cleaning the extracted seeds from impurities, which makes it difficult to further clean them at subsequent stages of the processing line. To eliminate this disadvantage, a pneumatic separating device was fitted for cleaning seeds from light impurities. The research aimed at experimental sub-stantiation of the basic constructive and technological parameters of the pneumatic separating device of the clover thresher and scarifier, ensuring cleaning from light impurities of more than 60%. The study was carried out according to conventional techniques using methods of planning a multi-factor experiment on a laboratory installation of a clover thresher when cleaning red clover seeds from light impurities. The study results have shown that the maximum effect of cleaning from light impurities reaches 96.7% with a minimum feed of source material of 200 kg/h, the angle of the grain board inclination of 42.85° and a maximum depth of the aspirating channel of 0.11 m. Based on design considerations and the maximum throughput of the clover thresher and scarifier, the following combination of factors was chosen as the optimal one: a feed of the source material of 300 kg/h, an inclination angle of the grain board of 45° and a depth of the aspirating channel of 0.09 m. With this combination of factors, the effect of cleaning from light impurities meets the technical requirements and equals 75.2%. Thus, the study has determined the basic design and technological parameters of the pneumatic separating device of the clover thresher and scarifier.

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