A hydraulic rock drill or drifter is a machine that drills holes into a rock and consists of a percussive system and a rotative system. The percussive system strikes the drill steel, for example, at 2,000 to 5,000 strikes per minute. Similarly, the rotation can be from 100 to 400 rounds per minute. With these two movements combined, the drifter is able to drill holes into rock. The drifter then breaks the rock by hammering impacts transferred from the rock drill to the drill bit at the bottom of the hole. The excess material is then pushed up from the bottom of the hole by either pressurized air or water. Hydraulic drifters, thus, are very efficient at drilling hard rock, primarily being used for drilling holes from between 60 to 90 millimeters (2.5-3.5 feet) wide. They are characterized by low torque, high RPM, and high frequency.
Progressive Blow Energy
The unique design of our piston generates a perfect, long shock wave in a trapezoidal shape:
► better transmission of energy at the couplings
► minimum stress into the drilling rods
► better bit penetration
Hydraulic Dampening System
The action of the dampening piston, not only absorbs the lost part of reflected energy but ensure a constant, thrust onto the tools:
► optimum shockwave transmission
► drifter protection and reduced tool vibration
Energy Recovery Valve
This valve allows for the piston's rebound energy to be utilized for the next blow, giving a definite advantage over the HC series drifters:
► better efficiency
► no internal peak of pressure source of cavitation
► ideal drifter protection
Hydraulic Reverse Percussion
The optional hydraulic reverse percussion system insures a real back hammering:
►tool extraction in fractured ground
►no rods left in the hole
