Knowledge of down-the-hole drill rigs

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. Origin of the nameDTH 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 mechanis. . 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 flui. [pdf]

Screw air compressor knowledge encyclopedia

A rotary-screw compressor is a type of gas compressor, such as an air compressor, that uses a rotary-type positive-displacement mechanism. These compressors are common in industrial applications and replace more traditional piston compressors where larger volumes of compressed gas are needed, e.g. for large refrigeration cycles such as chillers, or for compressed air systems to. WorkingRotary-screw compressors use two very closely meshing spiral rotors to compress the gas. In a dry-running. . The capacities of rotary-screw compressors are typically rated in (HP), ()* and (PSIG.) For units in the 5 through 30 HP range the physical siz. . The screw compressor was first in 1878 by Heinrich Krigar in , however the patent expired without a working machine being built. The modern helical lobe screw compressor was develo. [pdf]

Jiaozuo excavation and conversion hydraulic rock drill rental

A pneumatic rock drill uses compressed air, a piledriver and a drill bit to pound into and pulverize hard surfaces. This powerful, efficient tool combines superior. . An air-powered rock drill can meet the productivity and performance requirements of companies in a wide range of industries. . As your full-service equipment rental partner, Herc Rentals can provide the best possible rental experience. All our rentals come from leading manufacturers with. . Cut through the most challenging materials with a powerful, efficient air-powered rock drill from Herc Rentals. The knowledgeable rental specialists at any of our. [pdf]