• The deep well coal road cable of small diameter hole and high pre-tension structure and craft were studied according to the condition of high stress and composite roof in Fengcheng coal field.

    结合丰城矿区地应力顶板等复杂地质条件研究深井条件下煤巷锚索采用孔径加高预应力结构形式施工工艺

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  • The article describes how DF concept is used in the design of pressure feeders in small-diameter deep-hole drilling process.

    介绍如何应用DF 系统原理设计直径加工中吸送水器问题。

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  • Based on analyzing the demands of small-diameter deep-hole drill for vibration drilling, a new inner-chip removal drill was designed.

    分析了小直径振动钻头要求;设计了一种新型内排屑深孔钻头;分析了该钻头的结构和刃磨特点,进行了振动钻削试验。

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  • Based on analyzing the demands of small-diameter deep-hole drill for vibration drilling, a new inner-chip removal drill was designed.

    分析了小直径振动钻头要求;设计了一种新型内排屑深孔钻头;分析了该钻头的结构和刃磨特点,进行了振动钻削试验。

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