Because the rate of lump coal influence the price directly, so coal enterprises hope to have a method to control the rate of lump coal and increase the economy profit.
原煤的大小块率直接影响原煤的价格，所以煤炭生产企业迫切希望能够有效控制采出煤的块率，以提高企业的经济效益。
Practice has proved that this kind of technology can obviously improve the lump coal rate, increase the security of constructing, have better economic and social benefits.
实践证明，这种技术可以明显提高块煤率，提高产量，增加施工的安全，具有较好的经济和社会效益。
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