| 摘要 |
MINING MACHINE A mining machine having a rotary cutting head 1 which carries picks, e.g. a road header has water jets directed onto or adjacent to the picks of said cutting head and a means to phase the supply of water to selected picks only namely those picks on the surface of the rotary cutting head which engages the face to be cut. The means to supply water to the jets includes a plurality of circumferentially disposed chambers 14 in the rotary cutting head each to direct at least one jet onto or adjacent to one or more picks and each having valve means 15 to control entry of water thereinto. The means to phase the water supply comprises a drive swash plate 17 which is in surface contact with the valve means 15 of the chambers 14 and is adapted in use to be stationary relative to the rotating head 1 for actuating the valve means 15 of those chambers moving into the face cutting area to allow entry of water to those chambers. The water is fed to the chambers 14 of the cutting head 1 by an axial rotatable tube or 'lance' 10 on which the drive swash plate 17 is fixedly mounted and a brake swash plate 18 is also mounted on the lance 10 for engagement with brake means 9 adapted to stop rotation of the lance 10 such that the drive swash plate 1? is in a stationary disposition to actuate the appropriate valve means 15 relative to the location of the cutting face of the cutting head. The drive swash plate 17 and brake swash plate 18 are synchronised such that braking of the brake swash plate 18 positions the drive swash plate 17 in the correct stationary phasing attitude relative to the valve means 15 of those chambers 14 moving into the selected face cutting area of the cutting head. The brake swash plate 18 is engageable by a brake plate 9 which is liftable by selective operation of four circumferential pistons 4 so that a selected portion of the brake plate 9 engages the brake swash plate. The pistons 4 are activated or deactivated by movement of the hydraulic joystick which controls the attitude and position of a cutting boom 2 in which the cutting head 1 is co-axially mounted. |
