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Evaluation of wheat seed separation performances for new design of rotating cylindrical sieve, equipped with customizable homogenization coil

Organic farming practices impose restrictions on the use of chemicals in the technological phases of cultivation and processing of cereals. The restrictions may bring several challenges regarding the appropriate separation of wheat from contaminants and the efficiency of sorting the seeds by quality classes. Seed cleaning and sorting equipment working with rotating sieves show several advantages, consisting in a significant reduction of noise, increased durability of the components and the possibility to exclude other more complex devices from the technological flow. The main objective of the study was to improve the processes efficiency of the rotary grain cylindrical separators that are using small sieves, by installing a novel customizable subassembly. The equipment is designed in the form of an inner coil and has the role of breaking the immobile core of seed found on the sieve, to increase the aggressiveness of seed mixing and to better spread the seeds on the sieve surface. Comparatively evaluating the equipment during operation with and without the newly created subassembly, we were able to assess the distribution of the weights along the length of the cylindrical sieve and determine the optimal processing parameters. The working regime that allowed obtaining both the maximum amount of processed material and also a superior quality of the seeds, showed to be strongly dependent on the inclination angle of the sieve, the sieve speed, and the impurities content from the raw material.