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Unformatted text preview: different seam thickness and to prove the most effective pattern of
cut. The outer most arms can be hydraulically adjusted to vary diameter of cut. An
adjustable outer chain gives a desired shape of gallery.
Coal from the face drops to the bottom and is pushed on a scraper chain conveyor
by rotating arms, which are provided with ploughs. The scraper chain conveyor runs
centrally through the machine and carries the coal to the rear end. The rear end can be
swung on either side by 40° or can be raised or lowered hydraulically. The entire cutting unit is supported on hydraulic cylinders, which can tilt the cutting unit by 4 degree
in the horizontal or vertical plane. This allows borer to negotiate the irregularities of
the seam. This machine can drive the gallery of 1.8 to 2.3 m high and 3.2 to 3.8 m wide
while advancing at the rate of 0.3 to 0.75 m/minute. Likewise there are few other
designs that are available and used for mining the coal seams.
10.4 CLASSIFICATION BASED ON WEIGHT
The roadheaders based on machine weight, cutter head power could be classified5
as light to heavy duty units, which are capable of covering face size up to 45 m2; and
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- Spring '14