The paper analyses each parts of rotary mechanism of rotarydrillrig.
本文针对钻机回转机构的各零部件进行一定分析。
2
It is a walking-frame rotarydrillrig, suitable for industrial and civil piling construction.
该机是适应于工业与民用建筑桩基础施工的步履式螺旋钻机。
3
GCF-20A reverse circulation percussive rotarydrillrig is a multi function drillrig with percussive drilling as the main means and rotary drilling as supplemented.