DETERMINING THE ENERGY CONSUMPTION OF THE PROCESS OF GRINDING BY CUTTING IN A FEED GRINDER

Abstract

The relevance of the study is due to the need to reduce energy intensity and loss of nutritional value of feed while simultaneously improving quality indicators during the grinding process. The work was carried out with the aim of theoretical studies of the design and technological parameters of the feed chopper and determining the energy consumption of the grinding process by cutting. The scientific novelty of the research lies in the mathematical models for determining the cutting work and the total drive power of the feed chopper. When carrying out the research, the general scientific principles of the theory of elasticity, the theory of shells, and fracture mechanics were used, and the physical, mechanical and technological properties of feed of plant origin were also taken into account. A device is proposed, the design of which has the following advantages: a uniform supply of material to the cutting zone (to the knives) is ensured due to the working chamber in the form of a truncated cone, which leads to a consistent reduction in the size of the feed to those established by zootechnical requirements and improves its quality; the ability to change the angle of inclination of the rotary counter-cutting knives, which provides adjustment of the intensity of the grinding process; reduction in the energy intensity of grinding due to the free movement of crushed feed into the unloading chamber and the original shape of the tosser blade. Analytical expressions were obtained to determine the cutting work on each row of knives for one knife in a row, the total work of all knives per revolution, as well as the required power for the rotor drive. As a result of the research, it was established that the energy intensity of the grinding process is determined as the sum of the costs of cutting, acceleration of the material and idling of the rotor. The total power required to drive the chopper depends on the number, geometric characteristics of the chopper and counter-cutting knives, the rotor speed, and the properties of the material being crushed.