Abstract
In this paper the reliability of the haulage system in Tabas coal mine has been discussed using the failure and failure interval data in past 2 years for Armored Face Conveyor (AFC), Beam Stage Loader (BSL) and conveyer belt. In respect to the data study and classification, conveyor belt with failure abundance of 50.5 % is the most critical, while AFC with the failure abundance of 22.3 % shows the best performance. The results of data analysis indicate that all three machines’ reliability distribution function obeys the power law process. The reliability of AFC, BSL and conveyer belt reaches zero after 220, 30 and 8 h of continuous operation, respectively. The conveyor belt is the first system, which its reliability reaches to zero and cause the entire hauling operation to stop. Regarding to the high potential of failure in conveyer belt, it has always been considered as the most significant part of the system’s failure hence should be monitored more precisely. So, the conveyer belt is the most critical subsystem of the haulage system. Approximately, the reliability of the haulage system after 4 h reaches nearly zero. In the first hour system’s performance, it almost looses 90 % of its reliability, which is a considerable amount.
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