FIELD: mining.
SUBSTANCE: cutting machine includes a frame, a boom, a cutting head, a valve and a actuating device. The boom defines an upper and a lower surface, an inner chamber, and includes a first end connected to the frame, the second end and a hole located on lower surface and in hydraulic connection with inner chamber. The cutter head includes a plurality of teeth and is supported at the second end of the boom. The valve is connected to the boom and is movable between a closed position in which the opening is closed, and an open position in which the opening is at least partially open. The actuating device is connected to the valve to selectively move the valve between a closed position and an open position.
EFFECT: improvement of air flow system.
27 cl, 7 dwg
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