Head and Foot Shafts

size coal. Provide belt feeder complete with continuous belt, shafts,

pulleys, idlers, belt cleaner, frame, enclosure, reduction gear, and drive

motor.

2.9.7.1

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 pulley hubs.

2.9.7.2

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].

2.9.7.3

Belt

Mine Safety and Health Administration (MSHA) approved fire resistant

construction, belt not less than [_____] mm inches wide, [_____] ply,

[_____] kg ounces per square meter 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 psi and friction between plies of not less than [_____] kPa psi.

Belt shall have vulcanized splice.

2.9.7.4

Electric Motor

Totally enclosed, fan cooled, high torque, [_____] volt, [_____] phase, 60

Hz, not less than [_____] kW hp as specified under paragraph entitled

"Motors and Drives." Motor shall be direct connected by means of flexible

coupling with guard to a reduction gear.

2.9.7.5

Reduction Gear

Alloy steel helical gear type enclosed in oiltight housing. Provide an

adjustable base for motor and reducer unit. Drive from output shaft of the

speed reducer to the conveyor head shaft shall be by means of 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. Provide

means to properly tension drive chain.

2.9.7.6

Backstop

Differential band brake type, cam type, or internal type to prevent

reversal of belt.

2.9.7.7

Idlers

Flat type with 125 mm 5 inch diameter steel shells, malleable iron end

brackets, grease sealed roller-type antifriction bearings, and

self-cleaning angle bases. Idler spacing shall be not greater than 1372 mm

4 feet 6 inches. Return idler shall be of the flat single-pulley type

having 125 mm 5 inch diameter steel shells, grease sealed roller-type

SECTION 15502N

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