Determination of rational parameters of auger loaders of «Ural-20R» heading-and-winning machines

Abstract

Abstract The analysis of factors affecting the intensity of the process of grinding potash ore when loading by the auger body is performed. The main criteria for selection of rational parameters of auger loaders of heading-and-winning machines are indicated. The mathematical formulas are presented, including the design scheme of determining the rational value of the duty ratio of the cross-section of the screw, wherein minimal ore circulation providing in a screw spiral of the auger is developed. It is proved that work of auger loaders at rated performance of «Ural-20P-11/12» machines is accompanied by an increased filling ratio of interlobe space and ore circulation, which causes increase in the number of non-washable powdered classes in the breakage products. The dependence of the change of the rational fill factor and the productivity of the auger body on loading is established and analyzed. The rational value of a hub diameter of the auger loader of the «Ural-20P-11/12» machine in which minimum ore circulation and overgrinding in the spiral channels of the auger are determined by calculation. The technical solutions to improve the design of the augers are proposed.