Hydraulic rock drills and drifters
High performance hydraulic rock drill
Doofor DF550L-EXT is a high frequency rock drill equipped with a hydraulic back hammer. The back hammer enables removing stuck drill steels from the rock and opening the threads of lines of drill bars in extension bar drilling.
The DF550L-EXT has a very low overhead, only 84mm from the drill center line. The rotation motor of the DF550L-EXT can be installed on the right hand or the left hand side.
The rock drill has a separated flushing box. Flushing media can be water or air.
Optimal maximum hole diameter for the DF550L-EXT is 76mm [3”].
The rock drill can be equipped with male R32, R38 and T38 shank adapter (striker bar).
|Percussion power||17 kW|
|Percussion pressure||160 bar|
|(oil flow)||(95-120 litres/min)|
|Rotation motor*||125 cm3|
|Speed max.||250 rpm|
|Oil flow max.*||95–120 litres/min|
|Lubrication||Air-oil mist, min. 200 g/h|
|Flushing air pressure||5–7 bar|
|Flushing air flow||4000 litres/min|
|Flushing water flow||150 litres/min|
Feed force (pressure) must be adjustable during operation
*) Numbers given are for standard rotation motor (200cm3) at an intermittent pressure of 275bar [3989psi]. Motor options are 80cm³, 100cm³, 125cm³, 160cm³, 200cm³, 250cm³. For professional use only as a component of a hydraulic system.