OPERATION & MAINTENANCE MANUAL SWDE120B-3
10.7 WET-TYPE DUST COLLECTION
Theory
Wet-type duct collection system mainly includes water inlet filter, water tank, water
outlet filter, high-pressure cleaner, water flow regulation valve, pipeline etc. In cold northern
region, there’s an electric heater installed on the water tank. Fill clean water into the high
pressure gas of air compressor of DTH drilling rig with a jetting machine, it atomizes into
water spray through the high-pressure air, which combining with rock dust while slagging,
then condense the rock dust into groups that lowering to the ground to reach the aim of dust
removing by reducing the swirling dust. The water volume can be adjusted by the outlet
control valve and backwater regulating valve according to the swirling dust. In cold days of
the northern area, the electric heater on the water tank can be powered on to heat up the water
and prevent freeze. The water tank capacity is 1000L, the water pump outlet pressure is
6MPa, water pump flow is 9~15 L/min.
Operation
（1）Fill up the water tank from the top water feeding zone or the air filter, observe the
water level from the level gauge on the side of the water tank.
（2）Adjust the opening of the backwater regulating valve before starting the impactor to
keep it at the suitable position, then run the jetting machine.
（ 3 ） Observe the swirling dust while drilling, if there’s too much, increase the water
amount appropriately by turning up the outlet control valve to reduce the swirling dust. The
water volume refer to that it’s suitable when the discharged dust griped by hand can gather
together and it can be shaken to disperse. The water filling volume is too small if dust can’t
be gathered; open up the outlet control valve to increase the water volume. It’s too large if
dust can’t be dispersed; close down the valve to save water.
(4) Keep water pump and outlet control valve open appropriately while drilling and
cleaning to ensure the effect of dust collecting.
(5) Close the water pump or the outlet control valve to save water while the assembly,
disassembly and machine moving.
(6) Close the water pump to save water if there’s no dust during drilling.
(7) The water pump should be closed, the air compressor switch should be on to exhaust
the air for 30 seconds, thus drying the water in the pipelines, kelly bar, impactor and drill bit
to prevent rust after drilling and before day-off.
（8）Observe the water level in the tank at any time, refill water immediately when water
level drop to the lower position. The water pump is forbidden to run when there’s no water or
low water level in the tank.
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