St. Petersburg Mining University (Russia):

Shishkin E. V., Ph. D. in Engineering Sciences, Associate Professor, Vice-Head of Chair, shishkin_ev@spmi.ru

REC «Mekhanobr-Tekhnika» (Russia):
Safronov A. N., Ph. D. in Engineering Sciences, Project Director, safronov_an@npk-mt.spb.ru

The work is dedicated to a theoretical research of crushed material influence on the dynamics and stability of vibratory jaw crusher with inclined breaking space working mode. The design of crusher in question permits to adjust inclination angle of breaking space with a view to recycle production waste of long-length reinforced concrete structures (columns, poles, supports, railway sleepers, etc.), producing secondary crushed stone and specification scrap. The design of crusher in question includes cushioned frame and two jaws, connected with frame through torsional springs. An additional point is that jaws vibrations are excited by only one unbalance vibration exciter, mounted on upper jaw, but along with this, the jaws’ equally-spaced location remains unchanged. Crushed material effect upon vibrating system motion is taken into consideration approximately – through introduction of linear viscodamper between crushing bodies. Inclined crusher with one unbalance vibration exciter is significantly simpler in technical servicing, and permits to essentially reduce unproductive energy consumption. As a result of the research, the crusher forced vibration laws were determined, taking into account viscous resistance to movement, also, the machine power balance equation in working mode and equation for determination of equivalent viscous friction coefficient β were obtained. The condition for existence of synchronous out-of-phase motion mode of jaws, required for crusher efficient and steady operation, was formulated. This condition imposes certain restrictions upon maximum power of electric motor in the machine working mode, which is consumed for material crushing.

The work was performed with the financial aid from the Ministry of Education and Science of the Russian Federation for the Project No. 14.585.21.0002 UIPNI RFMEF158514X0002. R&D registration number 114093070076.

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