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- 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。
- Currently,the DTH rigs use generally a percussion rotary penetration sys-tem to generate the rotaing torque that produces a shearing action for breaking rock. 目前，潜孔钻机普遍采用冲击回转凿入系统，用以产生回转力矩，对岩石产生剪切作用而成颗粒分离。
- Keywords percussive rotary drilling;air-driven impactor;current status;development trend; 冲击旋转钻井;气动冲击器;现状;发展趋势;
- Keywords DTH hammer;percussive rotary drilling;bit;self-propelled round;simulation analysis; 潜孔锤;冲击回转钻进;钻头;自回转;仿真分析;
- percussive rotary drilling 冲积钻钻探,冲积转式钻眼
- a rotary drill, clothes drier, switch, etc 旋转式钻机﹑ 乾衣机﹑ 开关等
- Rotary drill rod used for coal mining roofbolter 煤矿锚杆钻机用回转钻杆
- Brief Introduction for Application of Rotary Drill 旋挖钻施工简介
- Specification for Rotary Drill Stem Elements 旋转钻柱规范
- Research on the small-Bore Drill of Rotary Drill 关于粘土层使用小口径旋挖钻机的探讨
- 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。
- 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。
- 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；
- 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。
- A similar board used as a percussion instrument. 敲击板用作打击乐器的一种类似的板
- 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。
- In modern rotary drilling, especially formulated mud is used in the well to keep the reservoir fluids in place, among other functions. 在现代旋转钻探作业中,经特殊配制的泥浆的功用之一就是使油井中储集层流体保持在原位不动。
- However, the SEP in diamond rotary drilling was higher than the SEP in percussive drilling in lightly weathered hard as well as in extremely hard rock. 在微风化的坚硬与极坚硬岩石中，金刚石旋转钻进比功则明显高于冲击凿碎比功。
- At six we were fallen in for drill. 六点钟我们站好队准备操练。
- SR360 rotary drilling when drilling play in the construction of the largest pebbles are more than 50 cm, geological strength 1200 kPa. SR360旋挖钻在施工时打出的最大的卵石有50多公分，地质强度达到1200千帕。
