MATHEMATICAL MODEL TO ESTIMATE THE ENERGY CONSUMPTION AT WHEAT GRINDING WITH ROLLER MILLS

In the grain grinding process, energy consuming is influenced by several parameters, among which may be mentioned, on the one hand, the constructive and functional characteristics of the machine and its working parts, and, on the other hand, the physic-mechanical properties of grains. Mathematical modeling of grinding process requires knowledge of the properties of material to be grinded, mainly seed breakage force required. In the milling with the roller mills, the torque of grinding roll shaft can be estimated by calculation if known the forces resultant acting on the roll, the direction of this force and its point of application on the roll surface. The paper presents a mathematical modeling for determining the torque of grinding roll shafts and some results of experimental researches on energy consumption of roller mills from technological flow of wheat flour plant with a capacity of 100 t / 24 h. Also, energy consumption for a laboratory mill with fluted rolls was determined, for wheat seeds grinding with different moisture content. Results are presented in the paper.