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PICK BACK FLUSHING (PBF) SPRAY
SYSTEM
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Higher production rates means higher
dust levels and because the point attack tooling system is a bursting
tool and the radial system is a cutting tool, research has shown that
the radial tooling system generates less dust.
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This can be seen more clearly on the following diagram. comparing the
cutting pattern of both tooling systems you can see that the slimmer
radial tool has less contact with the strata than the wider point
attack tool, allowing the carbide tip to cut clearance for the radial
tool rather than the bludgeoning effect of its point attack equivalent.
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Research has also shown that the most
effective way of suppressing dust is to capture it with a spray (not
a jet) at the point of dust make. It is therefore important to
position the spray in the toolholder/block at the back of the
pick/bit.
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The spray should be protected to avoid damage and should
spray water to envelop the pick/bit tip in the cutting zone.
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The spray on the radial system is
located in the toolholder/block and is shrouded by the heel of the
pick/bit for protection, as can be seen on this picture.
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The spray on the point attack system
is located outside the pick/bit. experience has shown that the point
attack spray housing is prone to washing or rapid wear when pick/bit
loss occurs. This leads to premature failure of the shearer drums due
to loss of water pressure integrity.
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