Based on the analysis of the main factors influencing on the ash index, provides that reasonable mining is the key to lift the economic benefit to coal enterprise.
通过对影响煤炭产品灰分指标主要因素的分析，提出实现合理配采，是提高煤炭企业经济效益的关键。
2
The application and good result of programmable logic controller using in the system of hoist lift signal and operation control in coal mine are introduced.
介绍了可编程序控制器在煤矿绞车提升信号系统和操车控制系统中的应用及收到的显著效果。
3
The paper introduces the main functional design of a kind of small cutting coal machine with hydraulic fork lift as feed power and chain-saw cutting knives driven by generator as working head.