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Shandong Yikuang Drilling and Mining Technology Co., Ltd.
Shandong Yikuang Drilling and Mining Technology Co., Ltd.
The essence of down the hole drilling is to make the impactor dive into the hole in the process of rock drilling, so as to reduce the energy loss caused by the transmission of impact energy by the drill rod, so as to reduce the influence of hole depth on the drilling efficiency.
Scope of application: down the hole drilling
Composition: rotary mechanism, lifting mechanism, pushing mechanism, supporting mechanism and impact mechanism
The down-the-hole drilling rig is an impact rotary drilling rig. Its internal structure is different from that of a general rock drill. Its gas distribution and piston reciprocating mechanism are independent, namely the impactor. The front end is directly connected to the drill bit, and the rear end is connected to the drill rod. When rock drilling, the impactor dives into the hole, and the piston (hammer) in the impactor reciprocates to hit the shank tail through the gas distribution device (valve), making the drill bit impact the rock at the bottom of the hole. The high-speed rotation of the impactor in the hole is realized by a separate rotating mechanism, that is, a motor or a pneumatic rotating device outside the hole, and a drill rod connected to the back end of the impactor. The rock dust produced during rock drilling is flushed out of the hole by the feng shui mixed gas. 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.
It is used to drill blastholes with a diameter of 20-100 mm and a depth of less than 20 meters in rocks above medium-hardness. According to their power, they can be divided into wind, internal combustion, hydraulic and electric rock drills. Among them, pneumatic rock drills are the most widely used.
In addition to rock drill, 80-150 mm small diameter down the hole drill can also be used when drilling borehole with diameter less than 150 mm. When drilling blasthole with diameter less than 70mm in coal or soft rock, electric drill or pneumatic drill is generally used. Drill pipe is driven by motor (or pneumatic motor), and rock (coal) cuttings are discharged through spiral groove on drill pipe.
