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 the drilling efficiency. The drilling equipment for downhole drilling is a downhole drilling rig, and the downhole drilling rig is an impact 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.
What is a DTH drilling rig and what is it for? A few days ago I didn't want to talk about my own company's DTH drilling truck, my friend suddenly asked, and I didn't guess that he would ask such a question, I was speechless, I didn't know where to start talking to him, and then I slowly gave him popular science What is the DTH drilling rig, and what is its function, now I have sorted out the following for you, I hope you have a deeper understanding of DTH drilling rigs. Why use a DTH drilling rig and what role can it play? Let's take a look with the editor of Hunan Ruisheng Mechanical and Electrical Equipment.
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 the drilling efficiency. The drilling equipment for downhole drilling is a downhole drilling rig, and the downhole drilling rig is an impact 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 stone powder produced during the drilling process is washed out of the discharge hole by the gas-water mixture. The mixed gas is injected into the impactor through the center of the drill pipe by the powder extraction mechanism, and then enters the bottom of the hole through the gas groove on the impactor cylinder. They are divided into two types: rock drills and drilling rigs. Drilling rigs are divided into open pit drilling rigs and underground drilling rigs.
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Rock drill: used to drill gun holes with a diameter of 20~100 mm and a depth of less than 20 meters in rocks above medium hard. According to its different power, it can be divided into pneumatic, internal combustion, hydraulic and electric rock drills, of which wind rock drills are the most widely used.
Open-pit drilling rig: According to the different working mechanisms of crushed ore and rock, it can be divided into wire rope impact drilling, DTH drilling, tooth wheel drilling and rotary drilling. Wire rope impact drills are gradually being replaced by other drilling rigs due to their low efficiency. Downhole drilling rigs use drill pipes to drive pneumatic impactors and drill bits to rotate together. The piston of the pneumatic impactor is used to impact the drill bit to crush ore and rock. They are usually used in small and medium-sized mines to drill blast holes with a diameter of 80 ~ 250 mm, and the tooth wheel drilling rig uses the rolling action of the tooth wheel drill bit to crush ore. Suitable for drilling in hard ore, diameter 150 ~ 440mm. It has the advantages of high efficiency and low labor intensity. 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 rig: When drilling downhole holes with a hole diameter of less than 150 mm, in addition to the rock drill, a small diameter downhole drilling rig of 80-150 mm can also be used. When drilling a blasting hole with a diameter of less than 70 mm in coal or soft rock, an electric drill or wind drill is generally used, and the motor (or wind drill) drives the drill pipe to drill the hole, and the drilled rock (coal) chips are discharged through the spiral groove on the drill pipe.
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