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Possible ways to develop the sieves of cleaning machines due to indicators improvements, increasing the quality of separation are presented. Sieve vibration modes in the horizontal plane applied to the sieve-cleaning machine are considered. Regularities of the grain separation process of the flat sieves vibrating in the horizontal plane are also presented. The dependences between grain material parameters and the uniform seed distribution over the sieve area with different directions of sieve vibrations are given. It is revealed that the complication of law results of sieves vibrations increases the probability of the sieve hole that particle are entering which allows one to increase the quality of grain heap separation, thereby significantly affecting the performance of the grain machine. Circular vibrations of punching sieves with the holes set at an angle to the direction of gathering to produce grain movement on the cycloid relative to the sieve surface and spin on its axis relative to the sieve hole. This movement of grain improves the quality of its separation from weeds.

Comparative analysis of operation indicators of flat sieve vibrating in horizontal plane