ENERGY DYNAMICS OF OCSILLATING FLAT SIEVES

Abstract

The paper suggests a new synergy method to describe grain medium behavior on flat oscillating sieves. Three equations are made up which allow to model the process of energy transmission from the sieve surface to the grain medium and to produce potential and free energy in the treated grain. It is proved that the system «flat sieve - treated grain» has the elements of self-arrangement and four replacing each other regimes of grain movement for a single half-period of oscillating. The first equation shows the balance of energy in the system, direction of its transition and transformation. The second equation determines regulations of energy intake from the working organ to the treated medium and reflects the process of the system self-arrangement. The third equation describes the equilibrium of actuating forces, inertia forces and resistance forces towards the shift of each elementary grain layer depending on its location in the loose body. The relationship of the oscillation half-period time and inertia force acceleration to the angular velocity of the flat sieve driving gear is identified. The directions are proposed to improve flat sieves at the expense of increased oscillation amplitude, reduced turns of the sieve driving gear crank, increased grain load on the sieve, increased coefficient of the sieve surface friction.