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系统地研究了南芬露天铁矿电铲、电动轮汽车和牙轮钻机的作业时间．得出了它们的固有可用度和实际可用度，提出了影响各设备实际可用度的因素，同时得出电铲的作业时间和故障时间服从威尔布分布。
Systematic study of Nanfen open-pit iron shovel, electric car and roller cone operation time. The inherent availability and practical availability of these devices are obtained. The factors that affect the actual availability of each device are proposed. At the same time, it is concluded that the operation time and failure time of the power shovel obey Wilbur distribution.