The Study On Friction Damage And Performance Evaluation Of Lining In Hoist

As one of the significant equipments used in mine’s hoisting, friction hoist depends on the friction between wire rope and friction lining to guarantee its safety and reliable operation, and the friction pair of friction lining and wire rope is the key to ensure its sufficient friction.Supported by Natural Science Foundation of China, the research of friction damage and performance evaluation on hoist’s lining was studied, aiming at mastering the tribological damage mechanism and laws during sliding between wire rope and friction lining, in order to provide theoretical basis and technical support to decrease slip accidents of friction hoist.Firstly, as for the slipping problem of wire rope in friction hoist, the tester was made to carry out the slidng friction experiment. The experiment results was analyzed to get the changing rules of tribological performance parameters(coefficient of friction, wear rate, temperature-rise and micro-morphology of lining’s wear surface) with the changing of sliding speed and pressure. Lining’s friction damage mechanism is studied by observing the micro-morphology of lining’s wear surface.Secondly, the changing rule of lining G’s storage modulus and loss modulus with the increase of temperature under different temperature-rise rate was obtained by thermal analysis. The friction heat flux in the process of sliding was analyzed in theory to set up the heat flux models of lining in the process of experiment. Combined with the wire rope and lining’s properties as well as friction contact characteristics, the contact model about finite element simulation was set up to analysis the changing rule of temperature-rise and equivalent stress on lining’s surface in the process of sliding. The simulation model was verified by comparison between simulation results and experimental results on test point.Next, based on acoustic emission technology the friction damage signal of lining was analyzed in the process of sliding. The changing rule of acoustic emission signal including signal energy and hit number with different sliding speed and pressure was analyzed, so was the changing rule of acoustic emission signal with test time. And the comparison of wear surface at the entrance and exit of lining is consistent with the acoustic emission test results.At last, based on the neural network theory, the prediction model of lining’s tribological properties was built to predict tribological parameters of lining under different pressure as well as sliding speed. The theory of grey correlation was used to analyze the relevance between sliding speed, pressure and lining’s coefficient of friction, wear rate, temperature-rise. The comparison experiment about tribological properties of two kinds of lining was carried out to analysis their difference under various pressure and sliding speed. The weight distribution of evaluation criterion about coefficient of friction, wear rate and temperature-rise was selected on the basis of AHP theory. With the fuzzy evaluation theory, the membership functions of lining’s tribological parameters were set up to analyze the experimental results. As a consequence, the influence of material, pressure and sliding speed on lining’s tribological properties, and the fuzzy evaluation of two kinds of lining were studied.