Degradation mechanisms of wire ropes operating on multi-layer crane and mine hoisting drums
The primary degradation mechanism of wire ropes operating on parallel grooved multi-layer crane and mine hoisting drums is normally external wear and plastic deformation at the half turn and layer cross-overs towards the drum end of the ropes. This paper discusses the influence that (i) nominal radial crushing pressure on the drum, (ii) cyclic changes in rope load and (iii) sheave and winder acceleration issues have on the rate of rope deterioration. Further factors such as actual rope contact areas and geometry are taken into account in the analysis and recommendations are made regarding the optimum rope designs and maintenance practices for multilayer drum applications. Specific examples of actual crane and mining rope operating experience are given to validate the theoretical analysis.