ANALYSIS OF DYNAMIC DISINTEGRATION OF ROCKS IN GYROSCOPE GRINDING MILL

The scientific basis is presented for the operation of a one-axis gyroscope mill, and the gyroscopic effect on creation of the tangential forces to disintegrate rocks is described. The scientific basis of the processes includes four provisions: the energy efficiency of disintegration of solid geomaterials by shearing and friction is higher by an order of magnitude than by compression; shearing forces are created exclusively by one-axis gyroscope; the value of shearing forces is directly proportional to the angular velocity and inertia moment of the spinner as well as the angular velocity of the gyroscope around the axis of the power drive; stable operation is ensured by the automated control of the gyroscopic moment by the mechanism of negative feedback. The physico-mathematical model of nonstationary motion of gyro under time-variant friction force in suspension and time-variant driving moments of electric motors is constructed. The program is developed for calculating dynamic parameters of a gyroscope grinding mill with central feed, which allows design and testing of a pilot gyro mill with the overall performance more than 0.01 t/h/kW. It is experimentally proved that disintegration of rock particles in the gyroscope grinding mill is described by Rittinger’s Law, and the energy is mostly spent to deformation of particles by shear under friction stresses.

Keywords

Rocks, shear stress, disintegration, friction, gyroscope grinding mill, one-axis gyro, efficiency.

Issue number: 12
Year: 2018
ISBN:
UDK: 621.926.77
DOI: 10.25018/0236-1493-2018-12-0-168-176
Authors: Grabsky A. A., Pokamestov A. V., Bobin V. A.

About authors: Grabsky A.A. (1), Doctor of Technical Sciences, Professor, e-mail: a.a.grabsky@yandex.ru, Pokamestov A.V. (1), Graduate Student, e-mail: pokamest@bk.ru, Bobin V.A., Doctor of Technical Sciences, e-mail: bobin_va@mail.ru, Institute of Problems of Comprehensive Exploitation of Mineral Resources of Russian Academy of Sciences, 111020, Moscow, Russia, 1) Mining Institute, National University of Science and Technology «MISiS», 119049, Moscow, Russia.

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