Description of down the hole drilling
The down-the-hole drilling rig is an impact rotary drilling rig. Its internal structure is different from that of a general rock drilling machine. Its gas distribution and piston reciprocating mechanism are independent, that is, the impactor, as shown in Figure 2. The front end is directly connected to the drill bit, and the rear end is connected to the drill pipe. When drilling, the impactor sneaked into the hole, and the piston (hammer) in the impactor reciprocates against the shank through the gas distribution device (valve), so that the drill bit impacts the rock at the bottom of the hole. The high speed rotation of the impactor within the bore is achieved by a separate swivel mechanism, i.e., by an electric motor or pneumatic rotating device outside the bore, through a drill rod attached to the rear end of the impactor. The rock powder generated during rock drilling is flushed 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 discharging mechanism, and then enters the bottom of the hole through the air groove on the impactor cylinder.
Parameters of down the hole drilling: