REC «Mekhanobr-Tekhnika» (Russia):

Kazakov S. V., Ph. D. in Engineering Sciences, Leading Design Engineer, atom2@inbox.ru

St. Petersburg Mining University (Russia):
Shishkin E. V., Ph. D. in Engineering Sciences, Associate Professor, Vice-Head of Chair, shishkin_ev@spmi.ru

A symmetrical flat dynamic design of vibratory cone crusher based on three-mass system is considered. It includes carrying body (vibrating platform) with two working organs (body and cone). Crusher’s body and cone are linked with each other through elastic system with coefficient of stiffness Сp, cone and vibrating platform — through elastic system with coefficient of stiffness Сn. Vibrating platform is supported by immovable foundation via resilient shock absorbers of negligible stiffness. Oscillations in the system under consideration are excited by a pair of self-synchronizing inertial vibration exciters, installed not on one of the working organs, as in conventional dynamic design of vibratory cone crusher, but on carrying body. The laws of pure forced oscillations of working organs and carrying body were revealed, and their amplitudefrequency characteristics were plotted, permitting to determine crusher’s optimum operating mode. This operating mode is provided with working organs’ exact antiphase oscillations at same oscillation frequency. Besides, it is shown, that at a certain disturbing frequency, carrying body becomes stationary (antiresonance), and only working organs vibrate. The latter together with elastic system Сn form so-termed dynamic absorber of carrying body. Owing to vibration absorbing effect, dynamical loads on vibration exciters’ bearings in the machine in question may be significantly decreased, also including impact loads. Moreover, application of this effect will permit to almost completely isolate foundation from unbalanced dynamic forces. A method of approximate estimate is proposed with respect to equivalent viscous resistance coefficient, permitting to take into consideration effect of crushed material upon crusher’s dynamics. The considered dynamic design of vibratory cone crusher seems to be promising for application in vibratory machines, designed for disintegration of various hard materials.

The authors are indebted to L. А. Vaisberg for helpful advice in performance of the work.
The work was performed with the financial aid from the Ministry of Education and Science of the Russian Federation for the Project No. 14.579.21.0048 UIPNI RFMEF157914X0048. R&D registration number 114093070077.

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