DTH hammer operates directly at the bottom of the borehole, where compressed air drives an internal piston to repeatedly strike the DTH drill bit.
Because of this operating principle, piston condition can have a major influence on drilling performance.
Compressed air enters the hammer through the drill string and is distributed through internal passages.
This air causes the piston to reciprocate at high frequency. Each impact transfers energy through the bit shank to the carbide buttons, which fracture the rock.
The cycle is repeated continuously while the drilling rig rotates the drill string.
Several factors can influence hammer performance:
Compressor pressure
Available airflow
Internal hammer wear
Piston condition
Air-distribution efficiency
Lubrication
Bit-shank compatibility
Rock formation
If the hammer receives insufficient air, the piston may not operate at its intended performance level.
After extended operation, internal components can gradually wear.
Possible symptoms include:
Reduced penetration rate
Unstable hammer operation
Increased air consumption
Weak impact
Difficulty starting the hammer
These symptoms should not automatically be blamed on the drill bit.
The compressor, drill pipe, hammer and bit should be inspected as a complete system.
Contractors should follow appropriate inspection and lubrication procedures and avoid allowing dirt or foreign material to enter the hammer during assembly.
YKDRILL supplies DTH hammers, DTH button bits and related rock-drilling tools for water well, mining, quarry, geothermal and construction applications.
A properly maintained hammer helps convert compressed air into effective rock-breaking energy, improving drilling productivity and controlling cost per meter.
