The use of cylindrical sieves to intensify the preliminary cleaning of grain material with a high contamination with plant residues

Abstract

Purpose. The goal is to increase the efficiency of the process of primary processing of grain with high contamination and moisture by intensifying the process of preliminary cleaning of grain material using cylindrical sieves. Methods. Experimental studies of the operation of a cylindrical sieve were carried out on the basis of the methods of a planned experiment. Processing of the obtained data was carried out using the methods of regression analysis and mathematical statistics using a PC and software packages MathCad, Statistika, Microsoft Office Excel. Results. The results of studies of the process of preliminary cleaning of grain material with high contamination and moisture are presented. The parameters and modes of operation of the cylindrical sieve are substantiated. The separation capacity of the sieve is determined depending on the coefficient of the kinematic regime. Conclusions. The use of a cylindrical sieve with an inclined axis of rotation will intensify the process of separating grain material with high contamination and moisture, which can significantly increase the efficiency of machines for pre-treatment of grain material. Based on the research results, rational values of the index of the kinematical mode of movement of the cylindrical sieve were determined, at which the maximum intensity of grain sifting is observed. When separating weed grain material, it is in the range of 0.55–0.65. It has been established that the separation of the main part of the grain (within 0.8–0.9) from the straw impurities occurs on one meter of the cylindrical surface of the sieve. For complete cleaning of grain from straw impurities, the length of the sieve is two meters. Keywords separation of contaminated grain mixture, rotary cleaning device, seed cleaning.