Substantiation of the parameters of the auger of the feed preparation unit and placement of knives on it

Abstract

Annotation Purpose. Approbation of the method of determining the design parameters of the auger spiral of the feed preparation unit in the preparation of feed components for feeding, taking into account the interaction of elements: auger, knives, hopper walls. Methods. Theoretical determination of the regularities of reducing the radius of the auger, which is in the hopper of the feed preparation unit in the process of preparing the feed mixture, determines the analytical method of research based on compilation and analysis of equations in the interaction of elements: auger, knives, and hopper walls. Experimental researches are carried out with application of methods of the theory of probability, mathematical statistics, planning of full-factor experiment. The analysis of theoretical data and results of experimental researches is executed with application of applied computer programs and systems. Results. In the feed preparation unit the main working body is a vertical auger. In order to determine the optimal design parameters of the working body, expressions are given for the construction of the auger and the rational interaction of elements: auger, knives, and hopper walls. It is experimentally proved that depending on the design and technological parameters of the feed preparation unit there is an impact on the profitability of the livestock industry. In the process of studying the preparation of feed components for feeding, the influence of the screw speed and the number of knives on the specific energy consumption and quality indicators (grinding and mixing) of the feed mixture was considered. Conclusions 1. During the study of the process of preparation of feed mixture for feeding it was found that in the hopper of the feed preparation unit the lower part of the coil performs the function of collecting feed mixture and feeding it in the vertical direction for further mixing in the middle part of the auger through the unloading window of the hopper. The initial radius of the auger turn is equal to the radius of the hopper at the bottom, except for the technological gap. The upper coil with a knife mounted on it provides active destruction of rolls and packs. 2. With increasing speed of the auger n specific energy increases, and the greater the value of the speed, the more intense the impact on grinding and mixing has the number of knives on the auger, with a stepwise effect. It is experimentally proved that the rational values, of the specific energy, obtained by installing on the auger coil 8 knives and the rotor speed of 25 min-1, while the processing time of the feed components is 7 min. Keywords: auger, mixing, number of knives, lower turn, spiral pitch, efficiency.