Atlas Copco Secoroc 7655 Panduan Operator - Halaman 7
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4. Air/water pressure and hose dimensions
Air pressure
Ensure that the compressor can deliver the required air pressure of 5 bar at the
machine.
h
High pressure (>6.3 bar) causes rough operation and damage.
h
Low pressure (<4 bar) results in a slow drilling speed.
Water pressure
Set the water preassure to around 3 bar. Maximum water pressure is 1 bar less
than the working pressure. For example if the air pressure is 5 bar, the water
pressure must be below 4 bar to prevent water entering the impact mechanism.
Air hose dimensions
The air hose diameter for model 7655 must be no less than 25 mm and no less than
19 mm for model 7655D. The inner diameter of connection nipples and hoses must
be no less than 19 mm. The ideal overall air hose length is less than 15m.
Water hose dimensions
The water hose inner diameter for model 7655 and 7655D must be no less than ½".
5. Prevent freezing
In low ambient temperatures, ice can form in the machine. This can be avoided if
the water in the compressed air is removed. This can be done by equipping the air
lines with water separators and drainage points for water condensate.
If the rock drill ices up, it must not be heated to melt the ice. Let the ice thaw at
room temperature.
Do not pour methylated spirits or similar substances into the rock drill, as they will
interfere with the lubrication and lead to increased wear.
Fitting and removing the drill steel
Before fitting the drill steel
h
Check that the drill steel shank is of the correct size and length for the chuck
used.
h
The shank must be clean and the drill steel must be in good condition.
h
The suitable quenching hardness of the shank is HRC48-53. A harder end face will
cause piston damage and breakage of the end face of the piston. If the shank face
is too soft it will be easily deformed by the piston which will result in difficulty in
removing the drill steel.
h
The shank end face shall be flat and perpendicular to the axis.
Remove sharp edges from the shank's end face. A rough shank surface will cause
h
premature piston failure.
h
Inspect the drill steel: A dull drill steel will slow down the drilling speed and
overstrain the drill mechanism. When changing drill steel make sure that the new
one is the correct size to follow your previous bore.
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