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- 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
- 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。
- Researches indicate that the new type of DTH hammer without drilling machine can make DTH hammer achieve percussive and rotary drilling using air compressor. 借鉴凿岩机的转钎机构,利用活塞的回程能量带动钻头旋转。
- 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 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。
- 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。
- 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。
- 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。
- The paper introduced the use of airlifting reverse circulation rotary drilling techniques in practice of major diameter socket pile operation at Xiangfan city s Hanjiang No. 介绍了使用泥浆护壁气举反循环回转钻进工艺进行襄樊汉江四桥大口径嵌岩桩的施工实践。
- Based on analysis of application prospects of rotary drilling in petroleum drilling, this paper presents the structure and working principle of the new hydraulic kicker. 在分析了冲击旋转钻井技术在石油钻井中的应用前景的基础上，介绍了新型液动冲击器结构及工作原理；
- 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;impactor;drilling rate;Model DGSC hydrodynamic impactor; 旋冲钻井;气动冲击器;DGSC型液动冲击器;
- 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 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。
- Bauma 2007: New range of pure rotary drilling rigs Bauma 2007:纯旋转钻机的新系列
- The drilling troops mustered on the hill. 演习部队在小山上集合起来了。
- rotary drilling cast-in-place pile 旋挖钻孔灌注桩
