Simulation of the stress state during blade wear and optimal design of the grain crusher wheel

Abstract

Currently, in the manufacture of agricultural products in the process of feed preparation, closed-type grain crushers are widely used, working on the principle of suction of the starting material and injection of the finished product. This type of crushers undergoes significant abrasive wear of working bodies (drums, hammers, sieves, etc.) due to their suboptimal geometric shape of the transition surface, where local stresses accumulate, as well as in the areas of contact of parts with particles of gas-dispersed material. It is possible to investigate the causes of the rapid destruction of the working bodies of the crusher by theoretical methods and modeling of physical processes, which will increase the speed, economic efficiency, reliability in the design of components and mechanisms, as well as optimize the design of the upgraded paddle wheel. The paper presents a theoretical model of the stress state on the working surface of the blade, the adequacy of which is confirmed by experimental data with a correlation coefficient of more than 0.95. Studies have allowed optimizing the position of the blade, at which it must be positioned at an angle of 10 ° to the axis of the wheel of the crusher drum, while the contact stresses on the wear surface are distributed almost evenly. This design change will lead to uniform wear of the blade and, as a result, to an increase in durability and reliability of the crusher.