Failure risks of mine excavator associated with its maintenance and repair

High quality and timely maintenance and repair (M&R) of mine electric excavators is crucial to minimizing the risks of failures. The article analyzes the significance of factors the influence the failure rate, including such factors as ergatic, technical, climatic, organizational and technological. The analysis showed the greatest criticality of ergatic, technical and climatic factors, with ergatic being the most important of them. The failure rating of mine excavators by the following systems is presented: working attachments, lifting gear, pressure mechanism, traveling gear, hydraulic system, rotation gear and electrical equipment. The most critical are the working attachments, lifting gear and pressure mechanisms, which make up 72%. The principles to design the concept of conscientious maintenance and repair practice (CM&R) are shown. The Fine-Kinney principle is applied in numerical estimation of the failure risks of mine excavators. Digitalization of target operations for electric crawler-mounted power shovels is proposed and a list of coded types of operations is presented for efficient accounting of the maintenance and repair works. The proposed coding system allows systematization of the MRO processes, providing control and their analysis during the whole operation period.