Study On The Reliability Of Semi-Continuous System For Overburden Removal Based On Fault Tree Analysis In Buzhaoba Open Pit Mine

Based on the production practice data of Buzhaoba open pit coal mine and the system equipment failure reason and maintenance, this paper used fault tree analysis and constructed the semi- continuous stripping technology system fault tree model. Then, system reliability was been reasonable allocated on the basis of the fault tree model, and compared with the existing system reliability. Finally, specific measures were raised to improve the system reliability.Stripping semi-continuous process system consisted of five subsystem, including mining sub-systems, truck transport subsystems, crushing subsystems, belt transportation subsystems and dump subsystem. Each subsystem link in series to complete the stripping task. Any subsystem breakdown will cause system production reduction or halt production, because of the system rigid linked. According 2012--2015 production data, this paper calculated each factor failure rate, repair rate and other basic parameters through mathematical statistics. By fault tree analysis qualitative and quantitative methods based on constructed the semi-continuous process system fault tree, it revealed weaknesses in the system to provide data support for the subsequent improvement program.What’s more, according to the system fault tree analysis and reliability allocation method, the subsystems were optimal allocation reliability, and compared with the reliability of existing condition, which provided a pointcut of how to improve the system reliability.Eventually, system reliability would be improved by means of system structure optimization, the reasonable equipment use, operation optimization and maintenance strategy. Specific measures as follows: firstly, it can improve the conveying belt conveyor subsystem reliability that increasing the surge bunker before and after this subsystem and 503 parallel redundancy, secondly, appropriately increase equipment production capacity, derating design, thirdly, by using the subsystem capacity coordination, flexible scheduling mechanism, finally, setting up reasonable unloading a number and adopt reasonable equipment maintenance.