该系统为矿井提升机的安全运行和高效运行提供了可靠保障。
This device provides reliable guarantee for safety and high effect run of mine hoist safeguard device.
对地方煤矿目前的生产状况进行了分析，对地方煤矿建设高产高效矿井的方法进行了分析和探讨。
This paper not only analyses the present conditions of the mines but also analyses and discusses the means to increase the hi-productivity and efficiency in mines.
采煤机是综采工作面生产原煤和实现高产高效矿井的主要设备。
The homemade shearer is a main implement equipment of mine of high yield and efficiency in working face of production coal.
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