Saint Petersburg Mining University, Saint Petersburg, Russia:

E. V. Shishkin, Associate Professor, Candidate of Engineering Sciences

Mekhanobr Tekhnika Research and Engineering Corporation, Saint Petersburg, Russia:

S. V. Kazakov, Leading Designing Engineer, Candidate of Engineering Sciences, atom2@inbox.ru

This research aims to reduce the power input of strong material disintegration and to improve the final product quality. The energy-efficient method of disintegration is proposed for extremely strong materials and industrial waste using vibropercussion crushers composed of two mobile crushing bodies free from stiff kinematic links and operating in strictly synchronous phase opposition. The crushers implement the phenomenon of self-synchronization of drive unbalance-mass vibration generators, which greatly simplifies the design and lowers the dynamic loads imposed on the machine components. The influence exerted by the material under treatment on the dynamics of vibropercussion crushers is studied. In particular, the procedure is developed for the while-in-operation calculation of the viscous resistance coefficient and, as a consequence, average vibration amplitudes of effectors of the machine with regard to the loading. The common method of taking the influence of the process material on the vibration machine dynamics in the form of a linear viscous damper is inapplicable in case of vibropercussion systems and needs amendment. The conditions of steady-state synchronous co-phase rotation of vibration generators are determined. Alternatively, performance of the crushers drops down to total failure of crushing. The recommendations on selecting science-based geometrical and inertia parameters for the vibropercussion crushers are given. The recommendations should be taken into account in the machine design and engineering to ensure efficient and reliable steady-state operation. The study is implemented using the approach of vibration engineering and theory of synchronization of mechanical vibration generators. The theoretical results are compared with the experimental data.

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