General:
Series DHD Water Well DTH Hammer are designed as a hammer drill. They differ from other rock drills, however, through continuous operation down against the drill bit.
Compressed air is led to the rock drill thorough the dill tube string. Exhaust air is discharged through hole in the drill bit and used to flush clean the drill hole. Rotation is delivered from a rotation unit and feed force from the feed is transferred the DTH drill pipe the drill bits.
Operation and maintenance Of Water Well DTH Hammer
1. The drive chuck and top sub are threaded into the cylinder with right-hand threads. The drill must be always operated with right-hand rotation.
2. Start collaring with reduced throttle to the impact mechanism and feeding, let the bit work its way slightly into the rock.
3. It is important that the feed force is adapted to the weight of the drill string. The force from the feed motor needs to be corrected during drilling, depending on the variable weight of the drill string.
4. The normal rotation speed for DTH lies between 15—25rpm。The upper limit generally produces the best generation rate, however, in highly abrasive rock, rpm should be in order to avoid excessive wear of the drill bit.
5. Clogged or cave-in of the hole, can lead to a stuck drill. It is best therefore, to cleans the hole regular intervals, by carrying out air-blowing with the rock drill.
6. Jointing operation is the work sequence where a down-the-hole drill is most likely to experience contamination, through cutting and various kind of impurities falling down the hole. Make it a rule therefore, to always cover the open the thread end of a drill tube during joining. Make sure also that the drill tubes are free from cuttings and dirt.
7. The importance of correct lubrication of the rock drill cannot be over-emphasized. In adequate lubrication accelerates wear and can ever lead to breakdown.
