About actual wear of a rope at two-layer winding on a drum of a vertical hoisting installation

Abstract

Powerful modern hoisting machines perfectly serve mines up to 800 ts depth. Lifting machines for mines of greater depth (not counting lifting machines with friction pulleys, which have known disadvantages) should have either drums of larger sizes than currently manufactured, or the possibility of using a double-layer coiling rope on the drum. New machines, unlike the existing ones, should have less weight and better qualities.