chain breaker

The impact-rotary drilling technique and its tendency;

液动冲击旋转钻井技术及其发展趋势

The developing trend and inherent drive force for rotary drilling are pointed out.

对油气钻井的关键技术、理论基础及多学科的交叉特点进行了阐述 ,指明了旋转钻井的发展趋势与内在动力 ,并对 2 1世纪油气钻井技术进行了展望。

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；并根据往复泵的能量方程推导了液动冲击器的单次冲击功、能量利用率和冲击频率的计算公式，并利用实测数据进行了验证。

Drilled caisson pile construction technology by rotary drill;

旋转钻机钻孔灌注桩施工技术

Based on the principle of conversation of energy,the energy for rotary drilling has been analyzed.

旋转钻进是岩土工程钻探的主要钻进方式,从能量守恒原理出发,对旋转钻进的能量进行分析。

Method for industrial test of rotary blast hole drills

GB/T10598.2-1989旋转钻机工业试验方法

kelly for well-drilling machiens

旋转钻孔,钻井机用

engine ,drill, dental, with swivel arm

牙科钻机,带旋转杆

great lengths of drill pipe which are rotated by an engine at the top,

钻杆顶部安装的发动机带动钻杆旋转，

Application of Combination Construction Method with Rotary Drilling Rig and Rotary Table Rig

旋挖钻机与转盘钻机组合施工法的应用

a rotary drill, clothes drier, switch, etc

旋转式钻机、 乾衣机、 开关等

a drill consisting of a bit and a brace to hold and turn it.

有钻头和可以握住和旋转的手柄的钻机。

a rotating drill powered by an electric motor.

用电发动机驱动的旋转的钻子。

drilling machine, rotary, self-propelled, for oil or gas

旋转式钻机,自动推进式,油田或气田用

As the diamond tip of the drill revolves, it is lubricated by mud.

在钻机的金刚钻头旋转的时候，泥浆便进行了润滑。

DEVELOPMENT AND APPLICATION OF UNDER-REAMED BORE PILE DRILLIED BY MECHNICAL ROTATING CUTTER

钻孔机械旋转刀扩底灌注桩的开发与应用

Study on Nozzle Wear Mechanism and Drilling Test of Swirling Abrasive Water Jet;

旋转磨料射流喷嘴磨损机理与钻孔试验研究

rotary wash-boring equipment

旋转式水冲钻孔设备

fully stabilized rotary assembly

全稳定的旋转钻具组合

screw-feed diamond rig

螺旋给料式金刚石钻机

hydraulic gait-model all-auger drilling machine

液压步履式螺旋钻孔机

auger backfiller

万能螺旋钻式回填机

The Research on Optimal Design and Dynamic Simulation for Driving Head of Valvelless Impact-Rotary Hydraulic Roofbolter;

无阀冲击旋转型液压锚杆钻机动力头优化设计与动态仿真研究