skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Extending wire rope service life

Abstract

Selecting the proper wire rope is not a simple procedure. Wire rope is a precision mining machine with scores of moving parts. It is therefore important for mining equipment users to know wire rope and how it is designed and constructed. Good lubrication and regular inspection is important for a safe and long service life.

Publication Date:
OSTI Identifier:
6786559
Resource Type:
Journal Article
Resource Relation:
Journal Name: Coal Min. Process.; (United States); Journal Volume: 19:6
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; MINES; ROPES; MAINTENANCE; ABRASION; BENDING; CORROSION; CRUSHING; DESIGN; IMPACT SHOCK; INSPECTION; LUBRICATION; MINING EQUIPMENT; SERVICE LIFE; WIRES; CHEMICAL REACTIONS; COMMINUTION; EQUIPMENT; UNDERGROUND FACILITIES 012000* -- Coal, Lignite, & Peat-- Mining

Citation Formats

Not Available. Extending wire rope service life. United States: N. p., 1982. Web.
Not Available. Extending wire rope service life. United States.
Not Available. 1982. "Extending wire rope service life". United States. doi:.
@article{osti_6786559,
title = {Extending wire rope service life},
author = {Not Available},
abstractNote = {Selecting the proper wire rope is not a simple procedure. Wire rope is a precision mining machine with scores of moving parts. It is therefore important for mining equipment users to know wire rope and how it is designed and constructed. Good lubrication and regular inspection is important for a safe and long service life.},
doi = {},
journal = {Coal Min. Process.; (United States)},
number = ,
volume = 19:6,
place = {United States},
year = 1982,
month = 6
}
  • The pair-plunger cyclinder presently made using Textolite or Getinax in gas cryogenic machines (GCM) has a number of shortcomings such as high coefficients of friction and low wear resistance. The present authors devised a polymer compound from which to make a plunger with good strength characteristics. Investigation of the antifriction properties of the epoxy silicon resins T-111 and SK-2 is presented. The devised polymer compound has a better composition than the presently used substances Getinax and Textolite.
  • This paper describes methods and materials used to extend the useful life ot extruded polyethylene insulated cables rated 15KV that have developed electrochemical trees in the insulation of sufficient severity to cause service failures. Earlier rehabilitation methods treated extruded dielectric cable with both gases and insulating liquids. This new method fills the cable and impregnates the insulation with a silicone liquid. This liquid, which is reactive, significantly improves the voltage breakdown strength of the cables, which has been reduced by electrochemical trees, and extends the useful service life of the cable. A review of the criteria used to develop themore » silicone liquid for this application and the methodology used to inject it into the cable will be discussed. An assessment of the costs of this life extension indicates a significantly lower cost than conventional cable replacement with little disturbance to the service and property of the customer.« less
  • A wire rope is a flexible cable consisting of a plurality of strands laid together helically, and symmetrically arranged with a uniform pitch around a core of wires or fibrous material. This construction provides warning of the eventual approach of failure in service by the progressive development of broken wires which can easily be detected by inspection. Characteristics of wire rope are discussed, and illustrations of various modes of service failure of wire rope in industrial use and in aircraft control cables are shown.
  • The fatigue failure of a nonrotating wire rope used on a skip hoist in an underground mine has been studied as part of the ongoing research by the US Bureau of Mines into haulage and materials handling hazards in mines. Correlation of individual wire failures within two segments of the failed rope were used to gain an understanding of the progression of degradation leading to rope failure. Wire failures occurred predominantly at locations of wear between adjacent strands. These interstrand wear site are identifiable by a large reduction in diameter; however, reduction in area is not responsible for the locationmore » of failure. Fractography revealed crack initiation sites to be located opposite the characteristic wear site or at other less noticeable wear sites. The primary failure mechanism of individual wires within the rope is believed t be a function of contact stress at the interstrand wear sites. Axially loading and unloading the rope produces high compressive stresses at the contact sites, which in turn produce large alternating tensile stresses on the opposite side of the wire. This mechanism has been termed contact stress-accelerated fatigue. This mechanism and the affiliated wear pattern both are consequences of interstrand contact.« less
  • A nonrotating wire rope used in main hoist operations is being examined by the US Bureau of Mines to determine operative wear mechanisms. Typically, bending and loading the ropes during service cause small, localized movements at interwire contacts, leading to material loss through wear.The cumulative effect of both material loss by wear and wire breakage by fatigue failure accelerates rope retirement. If the macroscopic mechanics of wire rope failure are to be understood, microscopic deformation and degradation processes must be identified and quantified. As a first step in this study, interwire wear and deformation were studied using a combination ofmore » scanning electron microscopy and hardness measurements. Both fretting and abrasive wear were identified as wear mechanisms. Preferential sites for fretting and abrasive wear were identified and are discussed regarding rope construction and geometry and the tribo-system.« less