For small rotaryrockdrill bits and rotary prospecting bits to cut soft, medium-hard rock.
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。
2
In rock drilling process with percussion-rotarydrill rotating drilling tool bears two toques: dynamic torque which drives drilling tool into rock mass, and resistance torque of rock mass.