helical or herringbone gears and antifriction bearings enclosed in oiltight
housing. Provide an adjustable base for motor and gear. Drive from output
speed shaft of the reduction gear to the conveyor head shaft shall be by
means of standard finished steel roller chain conforming to ASME B29.1M
running over cut tooth sprockets conforming to ASME B29.1M and complete
with steel plate chain guard. Roller chain attachments shall conform to
ASME B29.1M.
2.9.8.9
Electric Motor
Totally enclosed, fan cooled, high torque, [_____] volt, three phase, 60 Hz
not less than [_____] kW hp as specified under paragraph entitled "Motors
and Drives" in this section.
2.9.9
Bucket Elevator
Dusttight [centrifugal discharge] [continuous bucket] type having
approximately [_____] meter feet [_____] mm inches sprocket centers,
vertical chain and bucket, operating at a speed not to exceed [_____] m/s
fpm, and having a capacity of not less than [_____] Mg tons per hour of
[_____] size coal. Provide bucket elevator complete with continuous double
chains and attached buckets, upper and lower sprockets, gears, shafts,
bearings, casing, top hood, discharge spout, bottom boot, access doors,
electric motor drive, reduction gear, service platform, and accessories.
2.9.9.1
Head and Foot Shafts
Cold rolled steel not less than [_____] mm inches and [_____] mm 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 sprocket hubs.
2.9.9.2
Terminal Sprockets
Cast iron with chilled rims. Head sprockets shall be not less than [_____]
mm inches in diameter and foot sprockets not less than [_____] mm inches in
diameter.
2.9.9.3
Buckets and Chain
Construct buckets of [malleable iron] [not less than [_____] mm inch steel
plate] not less than [_____] mm inches long, [_____] mm inches wide, and
[_____] mm inches deep. Buckets shall be mounted by not less than four
bolt attachments to double strand of steel bushed chain each having an
ultimate strength of not less than [_____] kg pounds and pitch of [_____] mm
inches. Bucket spacing shall not be greater than [_____] mm inches.
2.9.9.4
Backstop
Differential band brake type, cam type or internal type to prevent reversal
of chain and buckets in case of power failure.
2.9.9.5
Elevator Casing
Not less than [_____] by [_____] mm inches inside of not less than
[_____][gage] [mminch thick] commercial hot rolled mild steel plate with 50
by 50 by 6 mm 2 by 2 by 1/4 inch corner angles for full height of elevator
casing. Construct casing in standard sections from 3 to 3.66 meters 10 to
SECTION 15502N
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