Influence of Eccentricity of Drive Mechanisms and Sieve Vibrations on the Quality of Seed Separation

In this paper, a theoretical and experimental study on the mechanical separation of seeds on the windrows is carried out. First, a study on the influence of vibrations on some quality indices of seed separation is carried out, and next to the kinematic of the drive mechanism (eccentric slider-crank) of the planar sieves, which is the active organ of the windrow, is analyzed. Next, the influence of the eccentricity of the crank mechanism was determined, on the seed quality indices of the first-quality and of the second-quality of the initial seed mass, for the wheat and barley seeds, respectively. It can be noticed that in the case of normal vibrations, as well as the reduced eccentricity of the sowing mechanism, the separation indices for the first and the second-quality seeds are higher than for the classical mechanisms. Correlation coefficients have very high values, which shows that the two curves, theoretical and measured, are very close.