what is the meaning of dth

...DTH drilling rig adopts an excellent motor, which has the characteristics of high efficiency, convenient operation, low investment and high economic benefit. Widely used in slope support, quarry, water conservancy projects, anchor bolts, highway and railway construction. The principal drilling methods used in mines today are mechanical ones in which a drill drives cutting tools into rock by means...

.... Compared with taper chisel bits, taper cross bits have a better drilling performance because carbide tips on cross bits doubled, which means carbides shape are

Tophammer drilling Together these elements make it possible to drill holes in the hard rock. The excess material (cuttings) is flushed up from the bottom of the hole by means of pressurized air or water. Top hammer drills are primarily used in mining, ...