Levchenko P. Substantiation of mode and constructive parameters of the vertical vibrating screen with the spatial oscillations of executive element

An object of the research is the classifying process of small and fine size minerals on a vertical vibrating screen in the field of spatial forces of vibration disturbances. The purpose of the study is to determine the effectiveness of the use of regulated transverse oscillations complementary to the longitudinal of executive element, separation effectiveness dependencies and productivity of vertical vibrating screen on its basic influencing factors and on its developed mathematical model during creating of the new technical level designs. The subject of the research is to determine the influence of mode and constructive parameters, as well as the characteristics of the material being processed on technological descriptors of the vertical vibrating screen. The research method includes the analysis and scientific synthesis of data on the screening process, the theory of planning and conducting experiments, methods of mathematical modeling and analysis using modern mathematical apparatus and PC. It has been established that the use of regulated transverse oscillations of executive element on the vibrating screen complementary to its longitudinal allows getting an 8-14 % increase of classification efficiency, hence it reasons a machine design change. It has been established that the productivity and efficiency of vertical vibrating screen classification linearly depend on the mesh size, squarely depend on the angle and length of the screening surface, specific load, rotation frequency of vibration exciter shaft, the percentage of undersize material in the initial material and the feedstock moisture. The efficiency of screening has a linear, and the screen productivity has a parabolic dependence on the oscillation amplitude, the inclination angle of the plane of the unbalanced mass rotation relatively to the horizon and the density of the material. The dissertation practical importance is described further. There two constructions of vertical vibrating screen and horizontal screen construction with spatial oscillations of executive element were developed at the invention level. "Methodology for substantiation of mode and constructive parameters of vertical vibrating screen" was developed and implemented at the technological cluster "Mechanical Engineering Technology - Polessye", which allowed achievement of the economic effect in 70 thousand hrivnas per year for one machine. "Methodology for determining the optimum parameters of vertical vibrating screen according to the technological requirements" was developed and implemented in the educational process of the National Mining University. "Recommendations for the use of vertical vibrating screen for the mined rock classification" was developed and implemented at JSC "Rafalovsky mining plant". "Engineering proposal for the use of vertical vibrating screen" developed and implemented at the LLC "Vibromach". The results of the research are appropriate for the educational process of the "Mining machines", design and research institutes use and at the mining enterprises.