用于中小规格冲击钻及旋转勘探钻具，凿进软岩层、中硬岩层。
For small rotary rock drill bits and rotary prospecting bits to cut soft, medium-hard rock.
现场试验结果表明，PDC锚杆钻头是钻进中硬岩层的理想钻头。
The results of field tests proved that PDC anchor bit is ideal in mid hard rock drilling.
由于金属矿层状顶板分布较少，故硬岩层状顶板的支护研究也相对较少且处于起步阶段。
Owing to the less common distribution of layered roof in metal mines, the research of the support of hard rock layered roof is relatively less and still at the initial stage.
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