Down-the | 電影影評網
![Down-the](https://i.imgur.com/FK6P5g9.jpg)
Adown-the-holedrill,usuallycalledDTHbymostprofessionals,isbasicallyajackhammerscrewedonthebottomofadrillstring.Thefasthammeraction ...
![Down-the](https://i.imgur.com/FK6P5g9.jpg)
Jackhammer-like tip for drilling deep into rock
DTH drill tool operated with drilling mud (Drillstar MUDHammer)A down-the-hole drill, usually called DTH by most professionals, is basically a jackhammer screwed on the bottom of a drill string. The fast hammer action breaks hard rock into small cuttings and dust that are evacuated by a fluid (air, water or drilling mud). The DTH hammer is one of the fastest ways to drill hard rock. The system is thought to have been invented independently by Stenuick Frères in Belgium and Ingersoll Rand in the USA in the mid-1950s.
Origin of the name[edit]DTH is short for “down-the-hole”. Since the DTH method was originally developed to drill large-diameter holes downwards in surface-drilling applications, its name originated from the fact that the percussion mechanism followed the bit down into the hole. Ap...
Down the hole drilling method | 電影影評網
down the hole hammer air flow | 電影影評網
Down the Hole Hammers (DTH) | 電影影評網
Down-the | 電影影評網
Down-the | 電影影評網
DTH Hammer Basics | 電影影評網
Sandvik Down-the | 電影影評網
Sandvik Down-the | 電影影評網
What is Down the Hole Hammer (DTH Hammer)? | 電影影評網
![](https://i.imgur.com/FK6P5g9.jpg)
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