2.9.2.1
Shaker
Shaker shall operate with a nominal 4 mm 5/32 inch stroke at 1200 rpm.
Stroke shall be generated by large eccentric SAE 1045 steel shaft mounted
in high capacity, self-aligning, spherical roller bearings. Seal bearings
with a double piston ring labyrinth seal and dust and water slinger to
retain lubricant and prevent entry of contaminants. Shaker frame shall be
stress-relieved, all welded steel construction. Fabricate frame of heavy
steel plate, with bearing housing seats machined after stress relieving.
Provide four lifting eyebolts of heat-treated forged alloy steel for
connecting to hoist chains.
Shaker Electric Motor and Drive:
Motor shall be totally enclosed, fan cooled, 1800 rpm, [_____] volt, three
phase, 60 Hz, not less than 15 kW 20 hp, as specified in paragraph entitled
"Motors and Drives." Motor shall be mounted on heavy spring isolated
supporting frame with adjustable motor base. Shaker shall be belt driven
with special deep groove sheaves, taper locking type hubs, and constant
belt tensioning spring.
2.9.2.2
Shaker Hoist
Twin hook type having a rated capacity exceeding the weight of the shaker
unit. Hoist shall have a lift of not less than 7.50 meters 25 feet with a
hoist speed of not less than 0.08 m/sec 16 fpm. Hoist shall have not less
than 460 mm 18 inch long sling chains for connecting hoist to shaker
lifting eyes, and hooks shall have U-bolt safety latches. Hoist shall be
mounted on an electrified trolley as specified in Section 14637N CRANES
OVERHEAD ELECTRIC UNDERRUNNING UNDER 50,000 POUNDS.
Shaker Hoist Electric Motor:
Totally enclosed, [fan cooled], [non ventilated], 1800 rpm, [_____] volt,
three phase, 60 Hz, not less than 5 1/2 kW 7 1/2 hp as specified in
paragraph entitled "Motors and Drives." Motors shall be high slip type
with thermal overload protection embedded in the windings.
2.9.2.3
Controls
Provide [remote] [pendant] pushbutton station for both shaker and hoist
operation. Provide automatic controls with upper and lower screw type
limit switches to limit hook travel, slack cable limit switch to stop
lowering of hooks when car shaker has been lowered on top of car,
electrical interlock to prevent operation of car shaker motor until shaker
is lowered on car, and electrical interlock to prevent operation of hoist
motor while car shaker is running. Mount electrical equipment in NEMA 4
enclosures.
2.9.2.4
Frame [and Enclosure]
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NOTE: If noise is a major factor of concern, design
a shaker enclosure with acoustical treatment which
will be capable of reducing the noise to a tolerable
level.
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Provide frame [and enclosure] as indicated for support of hoist and shaker
SECTION 15501N
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