Anti-rotating wire rope

Abstract

A wire rope for a heavy-load crane, such as a ladle crane is provided that is not only almost rotation-resistant but is also unlikely to be broken by wear and fatigue of wires. The rotation-resisting wire rope has a plurality of side strands. In side each strand, wires are laid in the same direction as the lay of core strand wires, around the periphery of a core strand. The side strands are laid in a direction opposite to the lay of the core strand wires so as to form the wire rope. The side strands preferably have a smaller pitch multiple than a pitch multiple of the wire rope. The ratio between a diameter of the side strands and a diameter of the core strand is preferably about 1.3 to about 1.8. The pitch multiple of strands is preferably about 5 to about 8 and the pitch multiple of the wire rope is preferably about 8 to about 10. Both the core strand and the side strands preferably have shaped wires, having a flattened surface, at an outermost ply.

Description

technical field [0001] This invention relates to rotation-resistant wire ropes, in particular to long anti-rotation wire ropes for overhead cranes or similar machinery. Background technique [0002] Steel wire ropes (hereinafter referred to as ropes) have various structural forms, and the ropes are used in accordance with standards such as Japanese Industrial Standards (JIS). Among them, the ropes of JIS No. 13 and JIS No. 18 are commonly used in cranes and are rotatable wire ropes. Rotation performance refers to the property of the wire rope to rotate itself when tension is applied to the wire rope. For ladle cranes in steelworks, where long wire ropes slide over multiple pulleys and carry heavy loads, rotatable wire ropes are used for such cranes, and the wire rope often rotates between the pulleys as the rope repeatedly slides on the pulleys. When sliding over multiple pulleys, the rope repeatedly bends in opposite directions to each other, shortening the life of the ro...

AI Technical Summary

Problems solved by technology

However, the anti-rotation performance of the above technology is not significant, and there are still some problems, including the breakage caused by the contact between the outer wire of the wire rope and the pulley, and the shortened life due to the breakage caused by the contact between the core strand and the side strand.

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