Abstract
Mine hoisting KOEPPE system or friction hoist winch work with traction pulley, the pulley rim grooves are lined. Lining has to provide a higher friction coefficient between the rope and the traction pulley. The constructors of mine hoisting machines require from the manufacturers a guaranteed appropriate and stabile value of a friction coefficient at different pressures between a rope and a friction lining under different external conditions (drought, moisture, icing, etc.). The paper presents processed measurements performed on the six samples of the friction lining (G1-G6) made of rubber and the sample of the standard used friction lining (K25). The samples (G1-G6) differ in the chemical composition of the rubber. Due to the confidentiality of the material composition of the friction linings the hardness of the lining material as a discriminator was chosen. The measured values of the friction coefficient of the rubber friction lining samples were compared with the values of the friction coefficient of the friction lining (K25) usually mounted on friction lining pulley
Highlights
A mine hoisting system connects underground excavating areas with surface technologies; it transports extracted material, mine workers, machinery and equipment for exploitation
These machines work with a rope passing through a friction pulley KOEPPE system or friction hoist winch, where the transport vessel travels between two horizons [5, 7]
The measured results of the friction coefficient show that all the rubber samples (G1 – G6) of the friction lining have a higher value of the friction coefficient than the friction lining K25
Summary
A mine hoisting system connects underground excavating areas with surface technologies; it transports extracted material, mine workers, machinery and equipment for exploitation. Shirong investigated the friction coefficients between the steel wire rope and Polyvinylchloride (PVC) lining [20] and the hoisting friction conditions in a mine. Ma and Lubrecht studied the local contact pressure between friction lining and steel wire rope. They developed first a 2-dimensional multigrid code based on the geometry of steel wire rope [17]. Rubber and plastic materials used for the manufacturing of the friction linings bring specific material properties [2] proper for specific operation condition of the mining hoisting system and especially for Eksploatacja i Niezawodnosc – Maintenance and Reliability Vol 23, No 2, 2021 the friction lining pulley. Reliability and safety operation of the mining hoisting system depends on the optimization of above mentioned material properties and good friction properties of the chosen material [16]
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