Substantiation of design and technological parameters of the rotary impact mill for the crushed shot production
Background. The process of splitting steel spherical shot is quite energy-intensive. Besides, the physical and technical characteristics of the finished product are subject to high requirements. This fact determines the importance of studying and improving these processes to reduce energy costs and the quality of steel shot. Materials and/or methods . The mathematical model is based on the application of the main parameters of the dynamics of the rotor-hammer system under constrained impact in the impact mill and the solution of the Hertz Contact Theory. The objective of this work is the substantiation of constructive-technological parameters of the impact rotary mill and increasing its efficiency in the production of steel crushed shot based on the proposed mathematical model of contact interaction of the impactor crushing machine with small shot, and the dynamics of the central working bodies in the working space of the crushing machine. Results . A mathematical model of the complex motion of the impact elements and the rotor is developed, which allows substantiating the highest efficiency of the process of crushing spherical steel shot in the impact mill with a combination of different materials of the working bodies. The dependences of the angular rotation velocity of the rotor and the linear speed of the hammer at impact with the shot, characterising the main parameters of the crushing the material process in the impact mill, are determined. The design and technical parameters of the impact rotary mill with the use of different combinations of materials of the main working bodies for their rational application in the crushing machine are proposed. Conclusion . The perspective direction of the increase of efficiency of the process of splitting of steel spherical shot, from the rise of operational characteristics of crushing machines, is the realisation of the direct central constrained blow at the superimposition of loadings on crushed material in a shock mill. The research results can be used to substantiate the basic design and technological parameters of the experimental crushing plant to confirm the adequacy of the mathematical model for the material crushing process during experimental studies, and in the future - as recommendations in determining the technical and operational characteristics of the impact rotary mill with movable hammers for introduction into the production of steel crushed shot.