Analysis of reliability indicators of basic implements of hydraulic excavators

The studies into functional reliability of basic implements and assemblies of hydraulic excavators in Kolyvan open pit coal mine of Siberian Anthracite Company are presented. Based on the studies, ranking of the equipment groups of Bucyrus and Liebherr excavators by the reliability criterion is performed. Among the fleet of excavators under analysis, the longest and shortest times between failures belong to the equipment groups in lubrication system and electrics, respectively. The factor analysis of causes of breakdowns in basic equipment groups of excavators produced some remarks on the current operating procedure of delay description accepted in the test open pit mine. The revealed shortages make it impossible to provide unambiguous interpretation of reliability of some components within the basic systems of excavators. The time intervals between failures per basic equipment groups are analyzed. The results allow drawing a conclusion that the times between failures agree with the theoretical exponential distribution, and the flow of failures agrees with the simplest statistical laws. The analysis of the mechanical outfit group reveals no any regular patterns in failures of metal structures per the winter–summer period of operation. It is found that the cause of the most failures is violation of operation instructions by excavator operators. The conclusion on the current level of reliability per basic equipment groups of excavators is made, and the components which require improvement of functional reliability are identified.

Keywords: hydraulic excavators, Bucyrus RH120E, Liebherr ER9250, Liebherr R984С, reliability of excavators, time between failure, average restoration time, reliability rating.
For citation:

Moskvichev V. V., Kovalev M. A. Analysis of reliability indicators of basic implements of hydraulic excavators. MIAB. Mining Inf. Anal. Bull. 2021;(7):96-112. [In Russ]. DOI: 10.25018/0236_1493_2021_7_0_96.

Acknowledgements:
Issue number: 7
Year: 2021
Page number: 96-112
ISBN: 0236-1493
UDK: 621.879:622.2
DOI: 10.25018/0236_1493_2021_7_0_96
Article receipt date: 09.07.2020
Date of review receipt: 20.08.2020
Date of the editorial board′s decision on the article′s publishing: 10.06.2021
About authors:

V.V. Moskvichev, Dr. Sci. (Eng.), Professor, Krasnoyarsk Branch of Federal Research Center for Information and Computational Technologies, 660049, Krasnoyarsk, Russia,
M.A. Kovalev, Deputy Head of the Internal Audit Service, MC Sibanthracite, LLC, 121108, Moscow, Russia, e-mail: kovalevmalk@gmail.com.

 

For contacts:

M.A. Kovalev, e-mail: kovalevmalk@gmail.com.

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