Defining rational parameters of a dividing head in a pneumatic grain seeding machine

The uniformity of distribution of sowing material on pipe-line is one of the most important indicators by which the quali-ty of carrying out crops sowing is defined. The uniformity of distribution in many respects depends on the design and technological parameters of dividing heads used on seeding machinery. The research objective is the improvement of the quality of distribution of seeds on the basis of the improve-ment of parameters of basic constructive elements of dividing heads of pneumatic grain seeder. On the basis of the analysis of literature the following main constructive elements of divid-ing head are allocated: a reflector and a collector. The re-search problems are theoretical justification of parameters of the reflector and collector of dividing head and experimental check of the results of theoretical researches. In the research classical methods of theoretical mechanics and computer modeling in the program Flow Vision complex were used, the experiment was processed according to the theory of plan-ning. During the research it was established that for the in-crease of uniformity of distribution of sowing material on pipe-line using reflectors of conic form in dividing heads of was effective. Theoretical studies have shown that cone-shaped reflectors with the angle of about 70 degrees between the plane of cone basis and the generatrix have the best charac-teristics. At these values of the angle the effect of "inertial distribution" of sowing material allowing reducing the influence on the uniformity of distribution of the difference of aerody-namic resistance of pipeline was provided. On the basis of computer modeling the parameters of dividing head collector were determined as first approximation. Two-factorial experi-ment made in vitro confirmed the results of theoretical re-searches. The unevenness of distribution when using an ex-perimental dividing head made about three per cent.