A down the hole drilling(usually called DTH) is mainly a pneumatic powered rock or ground drill, in which the percussive hammer is located directly behind the drill bit, so the percussion mechanism follows the bit down into the drill hole. The drill pipes transmit the necessary feed force and rotation to the DTH hammer and bit, as well as compressed air for the DTH hammer. Air flushes cuttings up from the bottom of the hole. Drill pipes are added to the top of the drill string as the hole gets deeper. The piston directly strikes the impact surface of the bit, while the hammer casing gives guidance to the drill bit. The fast hammer impact breaks hard rock into small particles, which are blown up by the air exhaust from the DTH hammer.

BR hammer(a kind of low pressure hammer) is suitbale for 7 - 20 bar with hole range from 54mm to 105mm. BR shanks include BR1, BR2, BR3. TF DRILLS BR hammers are produced by premium material and advanced technology, which helps all our customers to minimize the drilling cost.

DTH Drill String