The paper researchs the principle of protective seam mining, hydraulic slotting method and executing-digging technology to avoid risk of coal-gas outburst, and its practices in coal mine.
The paper gives an introduction about the hydraulic element's testing system of coal mining machinery, and analyzes experimental method and results.
介绍了采煤机主要液压元件的测试系统,并对测试方法、测试结果进行分析。
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The research result shows that longwall miningmethod with hydraulic pressure frame supporting capping rock is the optimal mining proposal for the gently inclined and extremely thin iron mine.