EVALUATING GRAIN FEED AT SEPARATION BY PLANETARY CYLINDRICAL SIEVE WITH ROUND HOLES

Abstract

There has been developed a mathematical model of the motion of grain particles, when they are sifted into the holes of the cylindrical sieve, making planetary rotation. The differential equations for the motion of a grain particle into the hole of the sieve have been obtained that take into consideration the design and mode parameters of the sieve, the velocity of a particle moving on the separating surface. The conditions for a grain particle to pass into the sieve hole were determined taking into account its maximum position above the sieve surface. There were identified major dependencies of the passage of long particles into the round holes on design, kinematic and technological parameters of the separation process on the cylindrical planetary sieves. The maximum flow of grains when sifted through one hole is achieved at 450 rpm of the sieve. The pattern of change in the velocity of a particle moving above the hole was determined. As the total pressure of the grains on the sieve surface (including rotation) increases up to 8 kg/(m · c2), grain feed increases from 0.15 to 8.5 kg/h.