Machinery & Energetics

The article discusses the interaction of the pressed material with the working bodies of the press granulator in the face of wedge-shaped limited space. As energy is transmitted, it is advisable to consider the stress state of the elemental volume of the product on these surfaces, which is the basis for determining the effect parameters characterizing the granulation process. With this in mind, the stress state of the pressed material in the wedge-shaped space between the working bodies of the press granulator is described and a mathematical model of the process of pressing granulation of plant materials in the closed wedge-shaped space between the matrix and each of the pressing rollers is presented. To solve the problem of determining the stresses in the extruded material, which are in a plane deformed state, an engineering method was applied, which involves determining the normal and tangential stresses not at each point of the volume of the deformed material, but only on the contact surfaces. The exact equilibrium equation was simplified on the assumption that normal stresses depend only on one of the coordinates. The approximate equilibrium equation is a single differential equation in ordinary derivatives. The scheme of interaction of the pressed material with the working bodies of the press granulator in the conditions of the end restriction of the wedge-shaped space is presented. The expressions for determining the area of the projection of the end contact surface of the elementary volume of the material on a plane perpendicular to the axes of rotation of the working bodies and the area of the end contact surface of the elementary volume of material are given. Eliminating normal stress from the obtained equilibrium equations, neglecting the infinitesimal of the second order of smallness, a differential equation was obtained for the lagging zone and the lead zone.

animal husbandry, granular feed, press granulator, die, pressing rollers, tension