Drilling rig works for creating holes in the ground. Rock drill can be massive structures housing equipment used to drill water wells, oil wells, or natural gas extraction wells, or they can be small enough to be moved manually by one person and are called auger. China rock drilling machine wholesale offered rock drilling machine applied to use on sub-surface mineral deposits, test rock, soil and groundwater physical properties, and also can be used to install sub-surface fabrications, such as underground utilities, instrumentation, tunnels or wells. Rock drills for sale can be mobile equipment mounted on trucks, tracks or trailers, or more permanent land or marine-based structures (such as oil platforms, commonly called 'offshore oil rigs' even if they don't contain a drilling rig). The term "rig" therefore generally refers to the complex of equipment that is used to penetrate the surface of the Earth's crust.
Drilling rigs can be:
* Small and portable, such as those used in mineral exploration drilling, water wells and environmental investigations.
* Huge, capable of drilling through thousands of meters of the Earth's crust. Large "mud pumps" circulate drilling mud (slurry) through the drill bit and up the casing annulus, for cooling and removing the "cuttings" while a well is drilled. Hoists in the rig can lift hundreds of tons of pipe. Other equipment can force acid or sand into reservoirs to facilitate extraction of the oil or natural gas; and in remote locations there can be permanent living accommodation and catering for crews (which may be more than a hundred). Marine rigs may operate many hundreds of miles or kilometers distant from the supply base with infrequent crew rotation or cycle.
From the history of rock drilling tools development, we may witness the advancement of drilling technique in China. In 1844, the first pneumatic rock drilling rig was invented, and has been used in the tunnel constructions. The advantages of this kind of rock drilling tools are easy operation and simple producing technique. But in terms of energy and construction aspects, the working efficiency is lower and the energy consumption is higher than other drill rigs. So in fact, many western countries are using hydraulic rock drills instead of pneumatic rock drills. In china, hydraulic drilling rigs are also be used by more and more people in the area drilling industries. Another evidence that also show the improvement of drilling technique in china, that is, increasing number of china rock drilling machine wholesale produces the rock bits with high working efficiency, hardness material, low energy consumption and abrasive resistance in the market. As we known the quality of drilling bits play an important role for the drilling process, because it is a main part of the drilling rigs.
Air compressor is one of the most important parts for rock drills for sale. An air compressor is a device that converts power (usually from an electric motor, a diesel engine or a gasoline engine) into kinetic energy by compressing and pressurizing air, which on command can be released in quick bursts to rock drilling tools.
The type of air compressor can be divided into positive-displacement air compressors and negative-displacement air compressors. The different as follow:
Positive-displacement air compressors work by forcing air into a chamber whose volume is decreased to compress the air. Piston-type air compressors use this principle by pumping air into an air chamber through the use of the constant motion of pistons. They use one-way valves to guide air into a chamber, where the air is compressed. Rotary screw compressors also use positive-displacement compression by matching two helical screws that, when turned, guide air into a chamber, whose volume is increased as the screws turn. Vane compressors use a slotted rotor with varied blade placement to guide air into a chamber and compress the volume. A type of compressor delivers a fixed volume of air at high pressures. Common types of positive displacement compressors include piston compressors and rotary screw compressors.
Negative-displacement air compressors include centrifugal compressors. These use centrifugal force generated by a spinning impeller to accelerate and then decelerate captured air, which pressurizes it.
Construction & Mining machine is used in mining to explore and develop sites, to remove and stockpile overburden, to break and remove rocks of various hardness and toughness, to process the ore, and to carry out reclamation projects after the mine is closed. Bulldozers, rock drills, explosives and trucks are all necessary for excavating the land. In the case of placer mining, unconsolidated gravel, or alluvium, is fed into machinery consisting of a hopper and a shaking screen or trommel which frees the desired minerals from the waste gravel. The minerals are then concentrated using sluices or jig.
Large rock drills for sale are used to sink shafts, excavate stopes, and obtain samples for analysis. Trams are used to transport miners, minerals and waste. Lifts carry miners into and out of mines, and move rock and ore out, and machinery in and out, of underground mines. Huge trucks, shovels and cranes are employed in surface mining to move large quantities of overburden and ore. Processing plants utilize large crushers, mills, reactors, roasters and other equipment to consolidate the mineral-rich material and extract the desired compounds and metals from the ore.