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SPECIFICATION FOR
OPEN DECK HOISTING MACHINERY FOR CLASS D & E WITH TROLLEY
GENERAL
All American Crane cranes are manufactured in accordance with
current mandatory requirements of the National Safety and
Health Act, OSHA Section 1910.179 and 1910.309 as applicable.
Additionally, all American Crane cranes are manufactured in
accordance with the appropriate standard of ANSI specifications,
the National Electric Code, and the Crane Manufacturers Association
of America (CMAA) specifications.
END
TRUCKS
End trucks are constructed of high strength ASTM A500 structural
tubing or welded structural shapes forming a rigid box section.
Trucks
are provided with rail sweeps and suitable bumpers designed
to meet or exceed safety standards.
TROLLEY
WHEELS
Double flanged wheels fabricated from C1045 rolled steel,
or forged steel, per AISI 1070, rim toughened to 320 Brinell
minimum per ASTM A 504. Wheels are mounted on high strength
alloy steel rotating axles and supported by spherical roller
bearings to provide a minimum L10 life as per Specification
#70.
HOIST
BRAKE
Fail safe, spring set, electrically released, totally enclosed
disc or shoe type thruster brake with self-adjusting mechanism
to automatically compensate for lining wear. Brakes are sized
for minimum 150% full motor torque.
HOIST
MOTOR
Variable speed vector motor with high temperature Class H
insulation to ensure reliability. Foot or flange mounted ribbed
frame construction with 100% copper conductors capable of
1000-to-1 speed range. Motor encoders are mill duty type with
state-of-the-art sensors that are unaffected by common contaminants.
The encoder enclosure is of ductile cast iron construction
for rugged reliability.
HOIST
GEARBOX
Ductile cast iron, fully enclosed gearbox with hardened alloy
steel planetary gearing rigidly supported by heavy duty tapered
roller bearings for high load capacity and long service life
for standard Class D hoists. Class E hoists have foot mounted
gear cases, parallel shaft type, cast iron enclosures with
helical gearing supported by roller bearings. Helical gears
are fabricated from alloy steel, carburized and finish ground.
TROLLEY
DRIVE
Keyless shaft mounted, parallel helical gearing with integral
motor and brake. Gears manufactured from certified steel,
heat treated to a case hardness of 58-62 Rockwell C and finished
ground or shaved to assure maximum mechanical efficiency.
The drive is totally enclosed with all gears oil splash lubricated.
LOWER
BLOCK
A fabricated steel housing supports ball bearing equipped
steel sheaves. The forged steel hook features a minimum 5-to-1
design and is supported via a swiveling crosshead and roller
type thrust bearing for 360-degree rotation. Safety latches
are provided based on customer preferences.
DRUM
Seamless tubing with machined left hand and right hand grooves,
with groove depth and pitch per CMAA 70 Specifications. The
drum is supported with a “barrel” type coupling
or splined connection to the hoist gearbox, thereby avoiding
a statically indeterminate loading condition. The opposite
drum end is supported by a spherical roller bearing.
LIMIT
SWITCH
Rotary geared type limit switch directly driven by the hoist
drum to accurately control upper and lower position of the
block. The switch features independently adjustable cams for
precise control. A paddle type control circuit limit switch
is also included.
TROLLEY
FRAME
Welded steel construction from rolled shapes and precision
bored. The hoist frame is designed to rigidly support all
machinery with minimal deflection for long service life. All
welding is performed in-house in accordance with AWS D1.1
by AWS Certified Welders. Lifting lugs are provided to allow
ease of installation.
ELECTRICAL
The electrical control panel is custom designed and engineered
in accordance with all applicable codes. Panel wiring is labeled
to match the wiring diagram, utilizing computer generated
“Brady” style markers. Branch circuit protection
is provided by fuses or breakers. A manual disconnect switch
and mainline contactor, mounted in the electrical enclosure,
allows maintenance personnel to shut off the power supply
to the crane.
Mainline
contactor and reversing starters, where applicable, are modular
plug-in style and designed for rugged reliability and a mechanical
life of up to 10 million operations.
The
electrical controls are housed in a heavy-duty 14-gauge gasketed
steel NEMA 12 enclosure designed to provide protection from
dust, dirt, oil and water. The door is mounted on a continuous
hinge and is easily removed by pulling the single hinge pin.
A hasp and staple are provided for padlocking.
Wiring
is in accordance with NFPA 70 Article 610. All wiring external
to an electrical enclosure is placed in rigid galvanized steel
conduits where the fittings and junctions are watertight.
Short lengths of flexible steel conduit with a watertight
covering are used to make connections to control devices,
such as limit switches or equipment subject to vibration.
PAINTING
All painted surfaces will receive proper metal preparation
and cleaning prior to application of the paint coating system
to insure good adhesion. A rust inhibiting prime coat shall
be applied followed by a finish coat of industrial enamel.
Finish
color will be safety yellow for crane bridge unit and blue
for trolley unit, thus providing good trolley positioning
contrast.
DOCUMENTATION
Three (3) maintenance and repair manuals will be provided.
Manuals will be provided in CR-ROM format at the request of
the customer.
A
recommended spare parts list shall be included in the Operating,
Parts & Maintenance Manual.
FINAL
FACTORY INSPECTION AND RUN TESTING
All motor, control and drive equipment will be operationally
no load, power run tested upon completion of manufacture.
Factory run test/check reports are completed to insure manufacturing
compliance.
Upon
completion of shop testing, parts that require disassembly
are clearly match-marked and tagged.
OPTIONS
• Custom designed hoisting machinery available up to
100 tons
• Auxiliary hoists
• Flame-hardened drums
• Centralized lubrication
• Power circuit limit switches
• Rotating lower blocks
• Weigh scale systems
• Positioning systems
• Mill duty AISE hoist brakes
• Deep hardened wheels up to 62 Rc
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1-877-877-6778
