We find several components inside the dust collector whose function is vital to the
dust collecting system.
The automatic cleaning cycle
In the dust collector the heavy chips fall to the bottom, but the fine dust collects on the
filter surface. When adding on a new drill rod there is time to clean the filter elements.
In the dust collectors, compressed air is used for cleaning the filters. This method gives the
best cleaning results and does not destroy the filter elements with hard mechanical
The system works as follows:
As the operator stops the rock drill, the flushing air (or the hydraulic pressure) is also, shut
off. In the air line or the hydraulic line there is an electric pressure switch. As the pressure
drops, the switch is closed and an electric signal goes to a small control unit mounted inside
the dust collector. This signal starts the cleaning cycle.
The fan creates the suction that makes the dust collector work
1. Pressure switch sends signal to the timer card when the rock drill is stopped.
2. Timer card activates solenoid valve N2 2 and the fan inlet is closed, which means no air
passes through the filters
3. Timer card activates solenoid valve NQ 1 with a series of pulses. Altogether 10 pulses, 1
sec between them. As an option there is available Timer card with 3 sec. interval
between pulses. The air blasts from the inside of the filters clean the filter surface.
4. After the ten pulses, solenoid valve N 2 closes, the spring loaded air cylinder returns.
5. If drilling is started before the cleaning cycle is finished the built in pressure switch
terminates the cleaning cycle.