it is a walking-frame rotary drill rig , 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鉆机。
the rock stratum drilled by a rotary drill is random distributed and complicated, so it is difficult to define the drilling process.
牙轮鉆机鉆凿的巖层是随机分布、错综复杂的,因而鉆进过程难以定义。
learn by affecting the normal operation of the main reasons rotary drill are: ① vibration amplitude distribution of a wider system, vibration accelerate large change;
经了解,影响牙轮鉆机正常运行主要原因是:①系统振动幅值分布较广,振动加速变化大;
the paper analyses each parts of rotary mechanism of rotary drill rig.
本文针对鉆机回转机构的各零部件进行一定分析。
in china, a vast development space can be provided to rotary drill rigs with the drive of qinghai-tibetrailway, beijing olympic games and shanghai international fair.
gcf-20a reverse circulation percussive rotary drill rig is a multi function drill rig with percussive drilling as the main means and rotary drilling as supplemented.