Research and development of the structures of highly loaded bunton dampers to decrease dynamic effects in the "vehicle–reinforcement" system

Abstract

The authors study the horizontal loads arising from the movement of vehicles under the action of dissipative forces (torsion of ropes, aerodynamic forces, loading the vehicle with eccentricity in the frontal and lateral planes) which act on rope-profile guides (hereinafter referred to as RPGs or guides). The structures of damper buntons are developed that reduce vibrations by the interaction of guides with damper elements of buntons of various structures, which are located at the meeting point of vehicles and further along the shaft. The step of limiting buntons at the meeting point of vehicles in the middle part of the shaft has minimum value, and then the step increases stepwise and further remains constant. A kinematic connection of the RPG and the bunton in the form of a bunton leg and connecting inserts is developed, which allow the guide to move up and down and bend to a safe amount in the frontal and lateral directions; then the horizontal load is damped with the help of bunton dampers and the bunton structure. Console buntons, located along the shaft depth with a constant step, are equipped with dampers, which consist of rubber inserts with soft metal plates, assembled using bolted connections on a console bunton. At the meeting point of vehicles in the middle part of the shaft, the console bunton dampers have a more complex structure and consist of shock absorbe rs built into the box-shaped bunton which rod is built into the bunton leg, which moves in the guides and damps the load. Bunton dampers consist of a shock absorber and a built-in pneumatic cylinder and have a greater absorbing effect. The development of various structural solutions for buntons with dampers for different shaft sections and a kinematic connection for a bunton operation with rope-profile guides makes it possible to achieve: – high reliability during RPG operation; – increased service life due to a significant decrease in the level of dynamic effects; – reduced labor intensity of maintenance and operation, compared to rigid reinforcement; – reduced metal consumption compared to rigid reinforcement. Keywords: mine vertical shafts, rope-profile guides, console-damper buntons, pneumatic cylinder, shock absorbers, draft gears, frame buntons, horizontal forces in the frontal and lateral directions.