Fluid supply systems for rotary cutter heads for mining machines and rotary cutter heads comprising fluid supply systems

A rotary cutter head drivably mounted on a rotary drive shaft of a mining machine, the shaft having an axially extending bore, the rotary cutter head comprising a hub assembly drivably mountable on the drive shaft, a barrel component secured around and co-axial with, the hub assembly, air flow inducing means comprising a plurality of passages angularly spaced around the axis of rotation of the rotary drive shaft within the barrel component, nozzle means for directing air flow inducing sprays along the plurality of passages, and a fluid supply system for feeding pressurized fluid from an inlet port mounted adjacent to the mining machine along a tube extending along the axially extending bore of the drive shaft to a distributor block mounted within said barrel for rotation therewith, said distributor block defining first and second passage means for low and high pressure fluids with a radially extending passage for said high pressure fluid in hydraulic connection with an annular passage extending around the distributor block, the nozzle means being provided on the distributor block in hydraulic connection with the annular passage defined by the distributor block.