Grit recirculating system for rock cutting cable saw - has valved chamber into which grit gravitates for discharge in pulses by injected water

摘要

The grit is suspended in water gravitates into a collection sump (12), and a chamber (14) is sited in a wall (13) which terminates below the invert (24) of the sump. The well (13) includes an inlet (13a) through which grit gravitates, has an overflow pipe (23), and houses vertical feeds (15, 16) to and from the chamber. An opening in the chamber cover is controlled by an axially and vertically reciprocating conical plug (17). The plug may be moved by a rod (18) connected to an electromagnet (20). The recirculation cycle entails the lowering the plug for grit to enter the chamber. The plug is then raised and a charge of water injected through the inlet (15). A mixture of water and grit is then expelled towards the saw through the outlet.