Stepanenko S. Mechanical and technological substantiation of processes and equipment of lattice fractionation of grain materials

In the dissertation the scientific and technical problem is solved - increase of efficiency of clearing of grain materials by substantiation of processes and the equipment of lattice fractionation of grain materials. The analysis of the technological process on the existing technical means for grain and seed separation is carried out. It is substantiated to increase the efficiency of separation of grain mixtures into fractions without increasing the area of the sifting surface of grain cleaning machines, while technical means must meet the requirement of division into fractions by the largest specific weight, is relevant and timely. Analytical bases of intensification of dynamic processes of aerodynamic separation of grain and seeds on a complex of physical and mechanical properties are developed. Spatial mechanical-mathematical models of the dynamic state of grain mixtures in the process of their complex processing into seeds of higher reproductions and simulation models of stochastic separation processes have been developed. Theoretically substantiate the rational laws of motion of the working bodies of grain cleaning machines. Conduct comprehensive experimental studies of individual grain cleaning machines. Technological and structural schemes of grain cleaning machine with separation of grain impurities in sediment chamber from fraction of light waste and small impurities, pneumofraction machine for grain cleaning, pneumatic system with two connected pneumatic separating channels, small pneumatic separator separator, pneumatic separator separator, developed. Experimentally obtain regressive models of the process of functioning of these machines and optimize the basic design and technological parameters. The physical essence and model representations concerning interaction of KZM particles with air streams, their division on aerodynamic properties are opened and on this basis the mathematical models defining influence of the positive considered forces (like Magnus and Zhukovsky), concentration of material on a trajectory of movement of particles are developed. branching (difference) and, accordingly, the efficiency of fractionation