Comparison of Rock Drill and Other Drilling
used in the hard rock above the diameter of 20 to 100 mm, depth of 20 meters in the hole. According to their different power can be divided into pneumatic, internal combustion, hydraulic and electric rock drill, which wind Rock drill the most widely used.
Open-air drilling rigs:
According to the work mechanism of crushing rock and rock, it is divided into rope impact drilling rig, down-hole drilling rig, roller drilling rig and rotary drilling rig. Steel rope impact drill because of low efficiency, has been gradually replaced by other rigs. DTH Drill Drill Driven by pneumatic drill and drill bit with the rotation, the use of pneumatic impactor piston impact drill bit broken ore, usually used in small and medium-sized mines drill diameter of 80 to 250 mm hole.
drilling holes less than 150 mm downhole holes, in addition to the application of drilling machines can also be applied outside the 80 ~ 150 mm diameter of the small diameter drill. In the coal or soft rock drill diameter 70 mm below the hole, the general power drill or air drill, the motor (or air motor) driven drill pipe drilling, drilling out of the rock (coal) debris by the drill pipe Of the spiral groove.