The aim of the paper is to analyze factors affecting tire life and to rank them using experimental data in order to determine how influential each of them is. The issue of tire wear is an important concern for many different companies because tires account for a major part of the operating costs of rubber-tired equipment.
The article analyzes the dynamics of tire heating depending on the operating time and the speed of a dump truck, as well as the effect of high temperature values during transportation on tire mileage. The dynamics of heating of hydraulic equipment, gearbox and hydraulic motors at different time intervals and in different working conditions is also analyzed. The task is to determine the dependence of changes in tire tread hardness on changes in tread temperature using experimental studies in laboratory conditions and to determine the direct relation to emerging loads in gearbox on the quality condition of tires. The analysis of the results of the influence of tire temperature on its properties and on early wear of hydraulic unit (gearbox) is carried out.
This article discusses a variety of diagnostic parameters and different control methods applied to trucks which are operated in open-pit mines. It contains the classification of truck parts and components based on their functions and the description of the main diagnostic parameters for each classification group. It analyzes equipment health monitoring practices and methods of predicting mean time between failures (MTBF) for the reduction drives of wheel motors produced by different companies. It describes one of the operational factors determining the choice of a nondestructive testing (NDT) method for the selected equipment. It analyzes the cost-effectiveness of using NDT methods and describes effective ways to reduce costs when using OTR tires taking into account the dependence of tire life on tire pressure and temperature.
The issue of the influence of the concentration of the solid phase on the reduction of energy costs and specific energy consumption during pulp transportation is considered. The procedure for preparing slurry from the current enrichment tailings is shown. A scheme is given and the operation of a hydroficated unit for thickening and hydraulic transport of backfill mixtures is described. A diagram of the movement of solid particles in one of the units of the complex – a lamellar thickener is shown. The summary table shows the main design parameters and characteristics of the lamellar thickener. A general view of the laboratory setup used for experimental studies with slurry at various concentrations is given. An example of calculating productivity, density and specific load is presented. The dependence of the shear stress on the velocity gradient was determined for various pulp concentrations. Experimental studies of the process of thickening the production of slurry from the current enrichment tailings have been carried out. It was found that the geometric dimensions of the thickener depend on the concentration of the solid phase in the transported mixture. It is concluded that the flow rate of the slurry and the head loss are functions of the rheological characteristics of the viscoplastic slurry and can be calculated from the derived calculated dependencies.
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