Theoretical determination of the probability of a particle passing through an oblong opening of a sieve of grain cleaning machines for cleaning agricultural crops

Abstract

The work of produced domestic grain cleaning machines is based on the reciprocating motion of the sieve mills. The increase in the productivity of such machines by traditional methods has exhausted itself. Therefore, agricultural enterprises of the country of various forms of ownership need high-performance innovative grain cleaning machines for post-harvest grain processing. The article studies the various methods and solutions that affect the intensity of the grain separation process and increase the qualitative and quantitative indicators of the operation of grain cleaning machines. According to the performed theoretical studies, the completeness of separation on the surface of the sieve depends on the probability of the passage of the grain through the oblong hole of the flat sieve, located at an angle, when interacting with the long edge, performing reciprocating oscillations. It is theoretically determined that in the range α’ from 0 to 20° the probability of the passage of a particle increases from 0.315 to 0.548 or by 1.7 times. At the same time, as shown by the production check of the operation of the sieves of the proposed design, the productivity of the grain cleaning machine increased by 23 %, and the quality of cleaning the grain mixture meets the agrotechnical requirements.