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PARAMETERS OF THE GRAIN TRAJECTORY AFTER TOUCHING THE SIEVE OF A SEMI-AUTOMATIC GRAIN CLEANING MACHINE

The main disadvantage of grain cleaning machines with rectangular sieves is limited throughput, which takes place due to a logical contradiction. It consists in the fact that as it passes through the sieve, the amount of material to be cleaned on the sieve decreases, and the width of the sieve remains unchanged. To overcome this contradiction, a grain cleaning machine with a sieve representing an inverted truncated cone that performs vertical vibrations is proposed. First, the parameters of the grain trajectory are determined after the first touch of the semiautomatic grain cleaning machine sieve when the sieve is in the lower position, and then when the sieve is in the upper position. Two variants of the grain trajectory are considered: when the grain trajectory after its collision with the sieve is in the vertical plane passing through the velocity vector, and when the grain trajectory after its collision with the sieve is in the vertical plane passing through the total force vector. The parameters of this interaction were determined by analyzing the grain path after the first sieving of a semi-automatic grain cleaning machine. Specific values of parameters are revealed, in particular, aggregate speed of the grain at the moment of its collision with the sieve, the angle between the grain velocity vector after reflection from the sieve and the horizontal, time of the grain's take-off over the sieve after falling on it, the range of the grain's flight over the sieve after falling. Based on the analysis, the conclusion is made: in order for the grain separation to be intensive, the sieve must move downwards with acceleration close to the acceleration of free fall.