2.9.8
Belt Feeder
Totally enclosed, dusttight, approximately [_____] meters feet between
pulley centers, designed to operate at a speed not to exceed [_____] m/sec
fpm, and having a capacity of not less than [_____] Mg tons per hour of
[_____] size coal. Provide belt feeder complete with continuous belt,
shafts, pulleys, idlers, belt cleaner, frame, enclosure, reduction gear,
and drive motor.
2.9.8.1
Head and Foot Shafts
Cold rolled steel, not less than [_____ and _____] mm [_____ and _____]
inches in diameter respectively. Mount shafts in antifriction roller
bearings with forced lubricating type fittings. Mount head shaft in fixed
pillow blocks. Foot shaft shall have screw-type takeups with not less than
a [_____] mm inch adjustment. Shafts shall fit tight in pulley hubs.
2.9.8.2
Pulleys
Welded steel type with detachable compression grip-type hubs, steel plate
ends, and crown faces 50 mm 2 inches wider than the belt width. [Provide
an adjustable spring loaded or counter weighted type rubber bladed belt
wiper beneath the head pulleys.]
2.9.8.3
Belt
Mine Safety and Health Administration (MSHA) approved fire resistant
construction, belt not less than [_____] mm inches wide, [_____] ply,
[_____] kg per square meter ounces per square foot, with 3 mm 1/8 inch
thick oil and chemical resistant cover on carrying side, 0.79 mm 1/32 inch
thick oil and chemical resistant rubber cover on under side. Cover shall
be fire resistant. Belt shall have a cover tensile strength of not less
than [_____] kPa pounds per square inch (psi) and friction between plies of
not less than [_____] kPa pounds per inch. Belt shall have vulcanized
splice.
2.9.8.4
Electric Motor
Totally enclosed, fan cooled, high torque, [_____] volt, [_____] phase, 60
Hz, not less than [_____] kW hp as specified in paragraph entitled "Motors
and Drives." Motor shall be direct connected by means of flexible coupling
with guard to a reduction gear.
2.9.8.5
Reduction Gear
Alloy steel helical gear type enclosed in oiltight housing. Provide an
adjustable base for motor and reducer unit. Drive from the output shaft of
the speed reducer to the conveyor head shaft shall be by means of finished
steel roller chain conforming to ASME B16.39 running over cut tooth
sprockets conforming to ASME B29.1M and complete with steel plate chain
guard. Roller chain attachments shall also conform to ASME B29.1M.
Properly tension drive chain.
2.9.8.6
Backstop
Differential band brake type, cam type, or internal type to prevent
reversal of belt.
SECTION 15501N
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