Rock drill:
Rock drill is used to drill blast holes with a diameter of 20-100 mm and a depth of less than 20 meters in rocks above medium hardness. According to their different powers, they can be divided into pneumatic, internal combustion, hydraulic and electric rock drills. Among them, pneumatic rock drills are widely used.
Open-pit drilling rig: According to different working mechanism of broken ore rock, it is divided into steel rope impact drilling rig, down-the-hole drilling rig, roller cone drilling rig and rotary drilling rig. Due to the low efficiency, the steel rope impact drilling rig has been gradually replaced by other drilling rigs. DTH drilling rigs use a drill rod to drive the pneumatic impactor and the drill bit to rotate together. The piston impact bit of the pneumatic impactor is used to break the ore rock. It is usually used in small and medium-sized mines to drill blast holes with a diameter of 80 to 250 mm.
Roller rig: Use the rolling action of roller cone bit to crush ore rock, suitable for drilling 150-440 mm diameter holes in hard ore rock. It has the advantages of stable efficiency and low labor intensity. In large and medium-sized open-pit metal mines It is widely used. Down-the-hole (or roller cone) rigs are composed of an impactor (or bit), a slewing mechanism, a lifting mechanism, a pressure device, a walking mechanism, a slag discharge system, a drill frame, and a drill rod.
Rotary drilling rig: only suitable for drilling soft ore and coal.
Downhole drilling rig: When drilling downhole blastholes with a hole diameter of less than 150 mm, in addition to rock drilling rigs, small-diameter downhole drilling of 80 to 150 mm can also be applied. When drilling blastholes with a diameter of less than 70 mm in coal or soft ore rock, electric drills or pneumatic drills are generally used. The electric motor (or pneumatic motor) drives the drill pipe to drill holes. The drilled rock (coal) debris passes through the drill pipe. The spiral groove is discharged.
