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- Keywords rotary drill rod;torsion strength;weld;heat treatment; 旋挖钻杆;抗扭强度;焊接;热处理;
- Rotary drill rod used for coal mining roofbolter 煤矿锚杆钻机用回转钻杆
- Analysis on Rotary Drill Rod Failure and Producing Technology 旋挖钻机钻杆失效形式分析及制造工艺
- Keywords Rotary drill rig Rotary carcase Decelerator Hollow main shaft; 牙轮钻机;回转小车;减速器;中空主轴;
- rotary drill rod 旋挖钻杆
- Integral Short Drill Rod Type DZ. 型整体式短钻杆。
- Keywords rotary drilling;navigational drilling;drilling tool;stabilizer;statics;finite element method; 旋转钻井;导向钻井;钻井工具;稳定器;静力学;有限元法;
- Keywords rotary drilling + impacting drilling;impact tool;jet flow;WOB;ROP;field testing;Changqing Oilfield; 旋转钻井十冲击钻井;冲击器;射流;钻压;机械钻速;现场试验;长庆油田;
- The mast assem-bly supports the rotary drill head and its hoisting mechanism. 支架组件支持转动钻头及其提升机构。
- The floating Rotary Head avoids abnormally wearing of drill rods' threads. 滑动式动力头，避免钻杆丝扣的非正常磨损；
- The drill rig adopts hydraulic transmission way to realize the rotation,propulsion,getting up and pulling of drill,as well as adjustment and fixing of drill rod obliquity during working. 该机工作过程中钻具的旋转、推进、起拔以及钻杆倾角的调整和固定等动作全部采用液压传动方式实现;
- Is the earliest Chinese manufacturer of the aluminium alloy cooling rods for the drill rod welding in the PTC industry. 公司以扎实的科研力量为依托，雄厚的生产实力为基础。
- The floating trailing plates avoid abnormally wearing of drill rods' threads. 浮动式动力头拖板，避免钻杆丝扣的非正常磨损；
- The LB 28 large rotary drilling rig is an ideal complement to the LRB combined piling and drilling rigs. LB28大型旋转钻机是LRB组合打桩和钻孔机器的理想补充。
- Keywords drill rod joint;surface hardening;wearing resistance;boriding; 钻杆接头;表面硬化;耐磨性;渗硼;
- In order to avoid the pollution caused by slurry around bridge-building sites, they use dry-boring by rotary drills where possible. 桥梁施工中为减少泥浆对桥位处的环境污染，尽量采用旋转钻机干法成孔。
- Keywords rotary filter;nozzel;vacuum pressure; 圆笼滤尘器;吸嘴;真空压力;
- With expert chassis of Rotary drilling rig and strong box type mast, it has high working stability. 应用徐工成熟技术制造的旋挖钻机底盘，结实的箱型臂架，具有超强稳定性；
- Shape and dimension of shank for drill rod 凿岩机导杆形状及尺寸
- The forming mechanism of the bias force is the key to the study of the modulated steerable rotary drilling system. 导向力的形成机理是研制旋转导向工具的核心。
