Loginova A. Validation of Rational Parameters and Kinematic Scheme of Centrifugal Percussion Disintegrator

The dissertation objective is to increase the reliability of the centrifugal percussion disintegrators (CPD) on the basis of definition the wear-life of rubber elements in the support unit of the CPD with due consideration of aging effect in conditions of acid aggressive environment and to increase the efficiency of disintegration by validation of kinematic scheme for disintegrators of the centrifugal percussion type, which destruct materials mainly by percussive shearing loads, on the basis of established dependencies of productivity and power consumption on the change of regime of the CPD operation and its design parameters and parameters of the inputs. The object of the research is the process of disintegration of the rocks into the CPD, taking into account the features of the rubber elements of the support unit and the change of the CPD kinematic scheme. Methods of research. The experimental and theoretical research methods were used: system analysis of scientific and technical literature on the use of elastomers in mining engineering; theoretical and practical data on the disintegration of rocks and the design of mining machines; methods of the theory of oscillations, analytical methods for solving algebraic and differential equations; methods of mathematical statistics for the analysis of experimental results. The scientific significance of the dissertation is to define the wear-life parameter of the rubber elements of the CPD support unit on the influence of the aging process in conditions of acid aggressive environment, and proving the efficiency of the two-rotor centrifugal percussion disintegrator, which destruct materials mainly by percussive shearing loads due to result of the combined action of kinetic energy intervertebral flows (in comparison with single-rotor construction) and determining of CPD process parameters (productivity and power consumption) on the change of regime of the CPD operation and its design parameters and parameters of the inputs (size, strength). The practical significance of the work is as follows: 1) The proposals for the modernization of the vibration isolation system of the CPD support unit at the level of the invention have been developed. 2) Methodical recommendations for determining the wear-life of rubber elements of heavy mining machines under conditions of acid aggressive environment have been developed. 3) A new two-rotor CPD design on the level of invention and laboratory example has been developed. Implementation of the results of research: Methodical recommendations for determining wear-life of rubber elements in the heavy mining machines working in acid aggressive environments were developed and presented to State higher education establishment The "State Chemical Technology University of Ukrainian" (certificate 02.02.17) and to public joint-stock mining company The "Shahtostroimontazh" (certificate 23.02.17) and obtain net present value of UAH 138 400. A technical proposal was developed for introducing the two-rotor centrifugal percussion disintegrator into the ash processing line at the Kramatorsk heat electropower station; in this connection, the CPD technological parameters were determined and submitted to public joint-stock company The “Novokramatorsk Machine-Building Plant” (certificate 27.09.17) and obtain net present value of UAH 791 000.