Analysis of the beats of separation sieve pans

Abstract

To ensure high productivity of grain production reliable operation of grain cleaning equipment is required. The process of cleaning seed material is connected to significant vibration loads some of which have an impact on the separation process and the operational reliability of the machine components. To combat harmful vibrations a theoretical analysis of the beats occurring during the sieve separation of grain was made. The law of motion of the mass center of the sieve pan is derived as a function from time over a period of oscillating. The analytical solution of the obtained equation allows determining the horizontal and vertical displacements of the mass center at every moment of time. Based on this motion, accelerations and related inertial forces are determined. These forces take on sufficiently large values, which lead to beats of the indicated separation devices. To determine the forces leading to these beats, using the d’Alembert’s principle, equilibrium equations are compiled, the solution of which allows determining the total horizontal force and reaction force in the suspension. The equations of equilibrium include the forces of tension on bending of the suspension rods. It has been established that a rational choice of the geometric characteristics of these suspensions can significantly reduce the forces acting on the drive of the sieve pan and, as a result, on the horizontal and vertical runouts.