SELECTION AND JUSTIFICATION OF A UNIFIED CRITERION FOR DIAGNOSTICS OF UNBALANCED ROTORS OF ENERGY AND MECHANICAL EQUIPMENT FOR ELECTRICAL MINING SHOVELS
This article discusses the criteria for the limiting state of the mechanical equipment of mining shovels containing defects such as rotor imbalance. The results of the statistical analysis of mining shovels failures have shown that the imbalance of the rotors is one of the prevailing causes of emergency failure of this type of technological equipment. Also, the article presents some research results in the development of an algorithm for creating a single diagnostic criterion for diagnosing the imbalance of the elements of the power-mechanical equipment of mining shovels. The substantiation and the formalization of diagnostic signs and rules in the field of vibration analysis suitable for the development of a single diagnostic criterion are given. Based on the monitoring results of the supports vibration activity, the vibration standards for rotors of electric machines of mining shovels were substantiated, taking into account their operating conditions. It is proved that the proposed methodology for creating a single criterion has a fundamental consistency, and can be used to perform a qualitative assessment and predict the processes of degradation of complex mechanical systems. Practical application of the results obtained will improve the safety of mining enterprises and minimize the number of unproductive downtime of complex and expensive mining equipment.