The sales, maintenance and service of rotary drilling rig drill rod;
旋挖钻机钻杆的销售、维修、服务；
The paper analyses each parts of rotary mechanism of rotary drill rig.
本文针对钻机回转机构的各零部件进行一定分析。
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钻机。
The rotary drill stem will engender direction drift in rotary drilling of directional well and cluster well.
在定向井及丛式井的转盘钻进中，旋转钻柱会产生方位漂移。
The method of rotary drilling hole and protecting hole wall by static mud is an advanced technique to drill hole.
静态泥浆护壁旋挖成孔工艺是一项先进的成孔工艺。
The rock stratum drilled by a rotary drill is random distributed and complicated, so it is difficult to define the drilling process.
牙轮钻机钻凿的岩层是随机分布、错综复杂的，因而钻进过程难以定义。
This paper analyses the main factors that influence the speed of drilling hole, puts forward the methods to settle the main working parameters of the rotary drill.
分析了影响牙轮钻机钻孔速度的主要因素，提出了钻机主要工作参数的确定方法。
This paper describes how the rotary drilling stem lost its stability in detail, and presents the main factors influencing drill stem stability in rotary condition.
系统地进行了斜直井中旋转状态下钻柱稳定性的试验研究，描述了旋转钻柱失稳的过程，分析了旋转状态下影响钻柱稳定性的主要因素。
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.
GCF -2 0a型冲击-回转反循环工程钻机是以冲击钻进为主、回转钻进为辅的多功能钻机，可适应软、硬岩石等不同地层钻进的要求。
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.
0a型冲击-回转反循环工程钻机是以冲击钻进为主、回转钻进为辅的多功能钻机，可适应软、硬岩石等不同地层钻进的要求。
In rock drilling process with percussion-rotary drill rotating drilling tool bears two toques: dynamic torque which drives drilling tool into rock mass, and resistance torque of rock mass.
前言：在冲击—回转式凿岩机向岩石钻进过程中，旋转中的钻具承受着两种力矩的作用：一是驱动其旋转的动力矩；二是被钻岩石阻止其旋转的阻力矩。
There are few systematical formulas to calculate the roller number and the distances between rollers in crawler travel system of rotary pile drill.
旋挖钻机履带式行走装置支重轮之间的距离及其数量的多少，尚缺少系统的计算公式。
Complete finite element analysis is conducted on pile frame of SYR200 rotary pile drill with the model, which provides guiding reference for the design of pile frames.
使用这种模型对SYR200旋挖钻机桩架进行了整体有限元分析，分析对钻孔机桩架的结构设计有指导意义。
May operate air-track, rotary, down-the-hole or other drilling machines to drill blast holes or may direct drilling of blast holes.
操作空气运作轨道，旋转，向下钻孔机或其他钻探机钻爆破洞或直接钻爆破洞。
To reproduce or increase the size of a hole by use of a drill, auger or rotary cutting tool.
用钻头，螺钻或旋转切割机在加工或增大孔的大小。
The optimum design method and basic principles of main reducer of rotary blast hole drill are discussed, The main reducer is taken as a whole and is optimized by discrete Complex method.
论述了牙轮钻机主机构减速器的优化设计方法和基本原理，以主机构减速器作为整体进行优化，采用离散复合形算法。
Crawler hydraulic drill, and USES the new type of hydraulic technology, low gas consumption, rotary torque, move the hole deflection is convenient.
履带式液压钻机，采用新型液压技术，耗气量低，回转扭矩大，移孔变位方便。
The key in finite element analysis on complete pile frame of rotary pile drill-finite element model of pin connection, is researched in depth. A feasible and accurate finite element model is offered.
对旋挖钻机桩架整体有限元分析中的关键件——销轴连接的有限元模型进行了深入研究，并提出了实用而精确的有限元模型。
The rotary and carriage assembly is adapted to apply rotational, thrust and pull-back forces to the drill pipe.
旋转和机架组件用于向钻杆施加旋转、推进和回拉力。
The rotary carriage provides rotary and vertical motion to the drill string and bit.
转动滑架为钻柱和钻头提供转动和垂直移动。
Rig GFC-120 is a kind of self moving reverse circulation rotary rigs. It is mainly used to drill side foundation holes and small water wells.
GFC-120型钻机为自走式动力头回转反循环钻机，用于降水井和护坡桩基础孔以及小型水井的施工。
The newly developed drill, XPL-20, for rotary jetting and anchor is introduced. The main features, technical data, application and structure of drill and its caterpillar chassis are briefly mentioned.
介绍了新开发的XPL - 20型旋喷锚固两用钻机的主要特点、钻机及履带底盘结构、技术参数和实践应用情况。
The structural characteristic and operating principles of KD type hydraulic tap hill drill with folding rotary mechanism are introduced.
详细介绍了KD型转臂折叠式全液压开铁口机的机构组成、工作原理和结构特点。
The key in finite element analysis on complete pile frame of rotary pile drill-finite element model of pin connection, is researched in depth.
对旋挖钻机桩架整体有限元分析中的关键件——销轴连接的有限元模型进行了深入研究，并提出了实用而精确的有限元模型。
"A" Taper Drill Bits are designed for use in a rotary hammer equipped with an "a" Taper type chuck.
型锥形钻头适用于装配了“A”型圆锥型夹头的电锤。
One great-torque motor with proper power is made to match with the rotary churn unit in pneumatic drill to form the electric pneumatic drill as one kind of powerful electrically driven tool.
将适当功率的大扭矩特种电动机与气动风炮上的旋转式冲击装置相匹配而产生出的一种有着强冲击扭力的电动工具――电动风炮。
For small rotary rock drill bits and rotary prospecting bits to cut soft, medium-hard rock.
用于中小规格冲击钻及旋转勘探钻具，凿进软岩层、中硬岩层。
With the increase in rotary speed, the motion state of drill string will be successively transformed from regular swaying into irregular swaying and regular whirling.
随转速的增加，钻柱的横向运动逐渐由规则摆动向无规则摆动和规则反向涡动转化。
The weight on bit and rotary speed are the main factors affecting the motion behavior of drill string. The higher the rotary speed is, the more easily the regular whirling will be formed.
钻压和转速是影响钻柱运动状态的两个主要因素，转速越高，越容易形成规则涡动；
The weight on bit and rotary speed are the main factors affecting the motion behavior of drill string. The higher the rotary speed is, the more easily the regular whirling will be formed.
钻压和转速是影响钻柱运动状态的两个主要因素，转速越高，越容易形成规则涡动；
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