Investigation of damaged conditions on wire rope slings used for a long time

-Focused on 6×24 wire rope-

Abstract

Wire rope slings are heavily used in the manufacturing and construction industries as lifting implements for hoist-suspended loads with cranes. Wire rope slings are often dragged during movement because they are heavy due to being made of steel. As a result, wire rope slings are susceptible to damage. Wire ropes and wire rope slings must be disposed of or replaced depending on the degree of this damage. The disposal criteria for wire rope slings exhibiting various types of damage, such as the number of broken wires, kinks, and corrosion, are specified in JIS B 8836. In the present paper, it is shown that the degree of damage of wire rope slings used for a long time in the manufacturing industry is notable, as investigated based on JIS B 8836. In addition, as an evaluation of the residual strength of damaged wire rope slings, the breaking force of damaged wire rope slings is experimentally obtained and compared to the breaking force of new wire rope slings. For example, the breaking force of wire rope is demonstrated to decrease due to flattening, which is a type of damage.