DEFINITION OF COFFICIENTS RECOVERY SPEEDS AT IMPACT OF THE STRIKER ON THE TOOL AT THE NODES OF CONSTRUCTION AND MINING MACHINES

Abstract

The processes of value changing of the restitution coefficient in a direct сentral impact of deformable bodies are presented, because values of the restitution coefficient are necessary for calculation the striker dynamics and the tool in the construction mechanisms and mining machines. The of kinetic energy loss of the colliding bodies after each impact is interrelated with the module of the restitution coefficient , which can vary for the same material from 0 to 1 at a different geometry of the interacting bodies .The analysis of the coefficient changes because of the recovery factor from the geometry of the colliding bodies is shown. At low impact velocities, when the bodies have the same shape and weight or when they hit the rob or the globe on a massive and hard obstacle, the recovery factor is approximately equal 1. When short rod hits to long and with the same diameters and the materials of the bodies, the restitution coefficient is equal the ratio of the lengths of the rods and it is also equal zero at impact of the rod on a thin plate. It is more rational to determine the restitution coefficient experimentally for bodies of complex shape. Experimental setup for determination of the recovery coefficient is observed, when it is theoretically difficult to calculate, especially at small impact velocities on horizontal and vertical stands or at medium and high speeds, or in Koper, operating on the principle of accumulation of energy for the shot. It is possible to vary not only the different geometry and materials of the colliding bodies, but also their convergence rate before contact.

Keywords

• коэффициент восстановления
• скорость
• удар
• кинетическая энергия
• инструмент
• строительные и горные машины
• боек