A down-the-hole drill, usually called DTH by most professionals, is basically a screwed on the bottom of a . The fast hammer action breaks hard rock into small cuttings and dust that are evacuated by a fluid (air, water or ). The DTH hammer is one of the fastest ways to drill hard rock. The system is thought to have been invented independently by Stenuic. DTH drilling rig, short for Down-The-Hole drilling rig, is a cornerstone of modern drilling technology. Renowned for its efficiency, precision, and versatility, this equipment has revolutionized industries ranging from mining and construction to geothermal energy exploration.
[pdf] In DTH drilling, the percussion mechanism – commonly called the hammer – is located directly above the drill bit. The drill pipes transmit the necessary feed force and rotation to the hammer and the bit, along with the fluid (air, water or drilling mud) used to actuate the hammer and flush the cuttings. The drill pipes are added to the drill string successively behind the hammer as the hole gets deeper.
[pdf] 
Ygz90 Coal Mine Rock Drill, Find Details and Price about Super Rock Drill Drifters from Ygz90 Coal Mine Rock Drill - Xi′an Long Teng Mining Equipment Co., Ltd.
Ygz90 Coal Mine Rock Drill, Find Details and Price about Super Rock Drill Drifters from Ygz90 Coal Mine Rock Drill - Xi′an Long Teng Mining Equipment Co., Ltd.
Roadway disc rock drill YGZ90 independent rotary rock drill tunnel horizontal downward upward drilling machine.
Introduction of YGZ90 guide rail type rotary rock drilling rig YGZ90 guide rail type rotary rock drilling rig is mainly used for the stone square project of up fan type or ring type medium and deep hole by connecting rod drilling in underground.
YGZ-90 guide rail rotary rock drilling rig has a large turning torque,therefore, it is not easy to jam when drilling mineral rocks with column gaps and karst caves,weak impact rotation method can be used to eliminate the failure even if the soldering failure sometimes occurs..
YGZ90 Rail-Independent Rotary Rock Drill, Find Details and Price about Rock Drill Rail-Independent Rotary from YGZ90 Rail-Independent Rotary Rock Drill - Xi′an Longteng Industrial and Mining Equipment Co., Ltd
[pdf] 
