Mathematical modeling of grain movement dynamics in the processes of air-centrifugal separation of grain material

The article is devoted to increasing the efficiency of the process of cleaning the grain of cereal crops by intensifying the release of garbage impurities from the grain material. Using the proposed mathematical models, the trajectories of movement of the components of the grain mixture along the working surface of the spreading disc and in the space of the annular air flow are determined, depending on the physical and mechanical properties of the mixture components and separator parameters. The effect on the components of the grain mixture of the lateral lifting force, which occurs due to the air flow's unevenness with the air channel's width, is considered when developing computational models. The dependences of the grain mixture components separation on the frequency of rotation of the spreading disc, the average value of the air flow in the channel, and the supply of material to the separator are established. The design and parameters of the scatter disc of the vibrating sieve grain separator are substantiated. The rational regime characteristics of the aspiration chamber were experimentally established, at which the efficiency of pneumatic separation of grain materials is 76-78% with the output of the grain fraction to waste less than 2%.