Analysis and modelling

AbstrAct Purpose: The main purposes of the paper are to discuss designing and exploitation problems of machines used in strip mines and investigation of its reasons based on steering frame breakdown of the dumping conveyor. Design/methodology/approach: Numerical (FEM) and experimental approach was used to investigate reasons of the breakdown. Fractographic and microscopic evaluation and chemical analysis, were used to perform material evaluations. The objectives are achieved by analysis of the numerical simulations results and data coming from material evaluations. Additionally the new design of the steering frame was discussed in order to prevent future similar problems in the half-shafts systems. Findings: The causes of break-down of the steering frame were found. Designing and manufacturing problems were the main reasons of the failure. The undercarriages half shafts systems of the open pit machines are prone to break-downs. They require detailed analysis to be successfully implemented into steering system. Recommendations for the single shaft system are given in the paper.

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