РАЗРАБОТКА И ИССЛЕДОВАНИЕ РАБОЧЕГО ПРОЦЕССА ИЗМЕЛЬЧЕНИЯ ЗЕРНА ДРОБИЛКИ УДАРНО-ОТРАЖАТЕЛЬНОГО ДЕЙСТВИЯ

Abstract

Based on the analysis of existing studies of the process of grinding grain, the goal and objectives of the research were set, a crusher of a grain of impact-reflective action was developed. The results of theoretical studies of the working process of the grain crusher, including the study of grains’ movement along the beam and the determination of the trajectory of movement of particles in the grinding chamber, are given As a result of the study of various methods of supplying the material, the lowest energy consumption was obtained when the comminuted material was fed through the upper loading window. In order to determine the joint influence of the factors under study on the criterion of optimization and the exclusion of insignificant, the semi-replica of the full factorial experiment was implemented. Variable factors were the rotor speed, the angle of attack, the material feed, the diameter of the holes, and the angle of coverage of the end sieve. The optimization criterion was specific energy consumption. At the next stage, grain refinement was investigated using a peripheral sieve instead of an end sieve, as well as a peripheral sieve and an end sieve at the same time. It was found that with an increase in the angle of attack hit the percentage of the yield of the finished product through a peripheral sieve increases. Also, to compare theoretical and practical studies, paint was applied to the surface, and then the nature of paint wear was examined. From a photograph taken after grinding the grain, one can see that in the area characterized by a positive value of b, the paint has worn off (which indicates a sliding movement of the weevil), and in the area with a negative value of b, we can see blows of the weevils. That is, the presented theoretical dependences quite accurately describe the nature of the movement of the weevil in the grinding chamber of the crusher. In order to determine the optimal values of the studied factors, a second-order experiment plan was implemented. The method of superimposing two-dimensional sections of the response surfaces yielded optimal values of the factors under study. At the same time, energy consumption amounted to 1 ... 1.3 (kW ∙ h) / (t - measurement unit), and the amount of dust and whole grains does not exceed the norms stipulated by GOST.