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.
Flushing head can be turned upside down. Motor can be on the left or right. Motor fitting direction can be specified (up, down or side). Accumulator valve direction can be specified.
Optimal maximum hole diameter for the DF550L-EXT is 76mm.
The rock drill can be equipped with male R32, R38, T38 or T45 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.