Studying the possibility of controlling the dynamic state of an impact ripper

Abstract

Introduction. Vibratory and impact loads transferred to the operator workplace limit the efficiency enhancement of rock or firm ground preparatory destruction by impact ripping equipment. One way to reduce the dynamic load transfer to the base machine and the operator is to include additional links into the implement kinematic chain, which redistribute dynamic loads to the zone of rock mass destruction. Methods of research are based on an integrated and systematic approach to the object of study as a multi-mass system, the state of which depends on the physical and mechanical properties of the medium, technological and structural factors affecting the energy efficiency of the mining and earthworks process. The research focuses on analyses of the effect the additional links parameters have on dynamic loads redistribution to the zone of rock or firm ground destruction. The research focus is conditioned by the need to develop structural solutions for the work equipment that controls the dynamic state of technological systems. When the constructive modernization solutions are completely exhausted, the need to improve the existing equipment and develop the fleet for special mining and earthworks necessitate such studies. Results. Removing the impact tool beyond the limits of the attachment point on the base machine is considered as one of the possible ways to protect the base machine and the operator from vibration loads. For this reason, the work equipment design provides for a rod with a counterweight pivotally connected to a toolbar. Force balance equations, including inertia forces as well, were derived considering the dynamic load impact. A relationship has been established between the impact tool layout on the rod, the impact energy and the reactive force in the rod rotation support. Conclusions. Graphical dependencies analysis established the range of variable parameters, which ensure the energy-efficient operation of the ripping equipment with a minimum transfer of dynamic loads to the operator’s workplace.