DTH

An important way to decrease in footage cost per DTH bit

降低潜孔钻头进尺成本的主要途径

Drilling with DTH can achieve high efficiency in rock and soil drilling engineering .

潜孔冲击器钻进是岩土钻掘工程中的一种高效钻进方法。

Pneumatic DTH ( Down-The-Hole ) hammer is one of main pneumatic percussive-rotary drilling equipments .

风动冲击器是气动冲击回转钻进的主要设备之一

This paper will report the effects of these three kinds of cells on DTH .

这三种细胞在DTH反应中均发挥一定作用。

Application of pneumatic DTH drilling in large & face anchor hole

风动潜孔锤钻进技术在大断面隧道锚杆钻孔中的应用

Simulation Experiment on Percussive Energy Transfer of Large Diameter DTH Hammer

大直径潜孔锤冲击能量传递模拟试验研究

On application of DTH drill in drilling pile construction in karst developing areas

潜孔钻在岩溶发育地区钻孔桩施工中的应用

Mathematical Model and Synthetic Analysis of Hydro-Efflux DTH Hammer inside Power Process

射流式液动锤内部动力过程的数学模型及仿真分析

Case analysis on failure mechanism of DTH button bits

潜孔柱齿钻头损坏机制的现场实例分析

Study on relationship between structural parameters of DTH bits and flow field at hole bottom

潜孔钻头结构参数与井底流场关系研究

The problem that the piston of DTH often becomes rupture ;

潜孔锤活塞断裂问题；

Application experiment of new technique with run-through DTH hammer in mine prospecting

贯通式潜孔锤新技术在矿山勘探中的应用试验

Preliminary Study on a New Energy-saving Pneumatic DTH Hammer

一种新型节能气动潜孔锤的初步研究

Design of PLC Electric-Hydraulic Control System for Model CS-165E DTH Drill

CS-165E型潜孔钻机PLC电液控制系统的设计

A way to increase in service life of high air-pressure DTH hammer piston

提高高风压潜孔冲击器活塞寿命的途径

Reverse Circulation DTH Hammer Drilling Technique and Its Application

潜孔锤反循环钻进技术及应用

The present situation of the Foam DTH Hammer Drilling at Home and Abroad

泡沫潜孔锤钻进技术的国内外研究现状

Applications of Secondary Development of ADAMS in Building Pneumatic DTH Hammer Virtual Prototype

ADAMS二次开发技术在气动潜孔锤虚拟样机建模中的应用

Determining the Maximum Depth Method for Complex Formation Pneumatic DTH Drilling with the Casing

复杂地层气动潜孔锤跟管钻进最大深度的确定方法

Development of FGC-15 Single Headed Large Diameter DTH Drilling System

FGC－15型大直径单头潜孔锤钻具系统研制

Results Positive DTH reactions were induced in the control animals only with splenectomy .

结果在单纯脾脏切除组动物均显示阳性DTH反应；

Analysis of shock wave in DTH bit

潜孔钻头中冲击波的分析

Researches on the Key Technologies of Hollow-Through DTH Used in Gas Drilling

气体钻井用贯通式潜孔锤关键技术研究

The results indicate that Se enhances DTH by promoting antigen presentation .

提示硒通过加强抗原递呈细胞的功能实现促进DTH反应。

Cluster DTH Hammer Used as Diaphragm Wall Trench Cutter in Hard Rock

用集束潜孔锤做硬岩连续墙开槽机

DTH reaction was positive in 6 patients , including the patient with PR.

包括PR患者在内的6例患者DTH反应呈现阳性。

Inner Hole Obstruction Mechanism Analysis of DTH hammer

潜孔锤内孔堵塞机理分析

Experimental and Drill Bit Flow Field Analyze of Run-through DTH Reverse Circulation Drilling Technique

贯通式潜孔锤反循环钻进技术试验及钻头流场分析

Improvement of DTH reverse circulation bit and its emulator on interior fluid field

潜孔锤反循环钻头体的改进与内部流场的仿真分析

This paper discusses the procedures of DTH hammer and core drilling with casing .

本文主要论述了空气潜孔锤跟管取心钻进规程。