Coal mining has always been a dangerous occupation .
采煤向来是一种危险职业。Under normal circumstances, at the end of pre-mining, coal mining operations prior to the start of contents of at least solid particles.
一般情况下，在采前准备结束，采煤作业开始之前，固体颗粒含量最少。The identification of the coal and rock interface would be one of the keys to have an unmanned coal mining.
煤岩界面识别是实现无人采煤的关键技术之一。The factors affecting the pick cutting, force condition and calculation formula of a single tooth shearer are discussed as well.
对于截齿切割时的影响因素进行了分析与研究。提出了采煤机单齿的受力状况及计算公式。Excavate coal subside seeper area is the special component of the surface water in Huainan.
采煤塌陷积水体已成为淮南市一种特殊的地表水体。Therefore both from technical and economic points of view, the powered support is a very important piece of equipment in a long wall face.
因此，从技术和经济两方面的观点看，液压支架是长壁采煤工作面设备中十分重要的一部分。When the running frequency is settled by the remote-controller, The tractive speed and direction of the miner can be obtained.
操作摇控器设定运行频率，即可获得需要的采煤机牵引速度和牵引方向。In other words, the more you can produce in a given period of time, the sooner you will be able to pay for the cutters.
换句话说，你们在一定时期内采的煤越多，你们偿付采煤机的货款也就越快。Scrapping farm-price support and protection for coal-mining offers a two-fold bonus: a cleaner environment and a more efficient economy.
废除农产品价格补贴和对采煤业的保护有双重的好处：可以获得更清洁的环境和更高效的经济。