The high-speed rotation of the impactor in the hole is achieved by a separate rotation mechanism by a drill pipe connected to the rear end of the impactor, that is, an electric motor or pneumatic rotation device outside the hole. The rock powder produced during rock drilling is washed out of the hole by the feng shui mixed gas, and the mixed gas is injected into the impactor through the center of the drill pipe by the powder discharge mechanism, and then enters the bottom of the hole through the air groove on the impactor cylinder block.
Why use DTH drilling rigs, and what exactly is DTH drilling used? The essence of downhole drilling is to submerge the impactor into the hole during the drilling process to reduce the energy loss caused by the impact work transmitted by the drill pipe, thereby reducing the influence of hole depth on drilling efficiency. The drilling equipment for downhole drilling is a downhole drilling rig, YQ-80, YQ-100 and QZ-165 are commonly used in underground mines in China.
A downhole drilling rig is a type of percussion rotary drilling rig. Its internal structure is different from that of ordinary rock drills. Its gas distribution and piston reciprocating mechanism are independent, that is, the impactor. The front end is connected directly to the drill bit and the rear end is connected to the drill pipe. When drilling, the impactor pierces into the hole, and the piston (hammer) in the impactor reciprocates, hits the drill tail through the gas distribution device (valve), so that the drill bit hits the rock at the bottom of the hole. The high-speed rotation of the impactor in the hole is achieved by a separate rotation mechanism by a drill pipe connected to the rear end of the impactor, that is, an electric motor or pneumatic rotation device outside the hole. The rock powder produced during rock drilling is washed out of the hole by the feng shui mixed gas, and the mixed gas is injected into the impactor through the center of the drill pipe by the powder discharge mechanism, and then enters the bottom of the hole through the air groove on the impactor cylinder block.
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It is divided into two categories: rock drills and drilling rigs, and drilling rigs are divided into open-pit drilling rigs and downhole drilling rigs.
Rock drill: used to drill holes in rocks above medium hardness, diameter 20 ~ 100 mm, depth less than 20 meters. According to their power, they can be divided into pneumatic, internal combustion engine, hydraulic and electric rock drills, of which pneumatic rock drills are the most widely used.
Open-pit drilling rig: according to the different working mechanisms of ore and rock crushing, it is divided into wire rope impact drilling rig, downhole drilling rig, conical drilling rig and rotary drilling rig. Wire rope impact drills are gradually being replaced by other drilling rigs due to their low efficiency. DTH drilling rig with drill pipe to drive the wind impactor and drill bit to rotate together, using the piston impact of the wind impactor to crush ore, usually used in small and medium-sized mines to drill 80~250 mm diameter gun holes. The Tooth Wheel Drill uses the rolling action of the Tooth Wheel Drill to crush ore. Suitable for drilling holes with a diameter of 150 ~ 440 mm in hard ore. It has the advantages of high efficiency and low labor intensity, and is widely used in large and medium-sized open-pit metal mines. An underground (or conical) drilling rig consists of an impactor (or drill bit), a rotating mechanism, a lifting mechanism, a pressurizing device, a traveling mechanism, a slag discharge system, a drill frame and a drill pipe. Rotary drilling rigs are only suitable for drilling soft rock and coal.
Downhole drilling rigs: When drilling holes with a diameter of less than 150 mm, small diameter downhole drilling rigs from 80 mm to 150 mm can be used in addition to rock drills. When drilling a blast hole with a diameter of less than 70 mm in coal or soft rock, an electric drill or wind drill is usually used, and the motor (or pneumatic motor) drives the drill pipe to drill the hole, and the drilled rock (coal) chips are discharged through the spiral groove on the drill pipe.
For more information about
DTH drilling rig, pay attention to our Hunan Ruisheng Electromechanical Equipment Co., Ltd., our official website is
www.hnzega.com.
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