INTERNATIONAL ANDSPECIALIZED TRANSPORT
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MARCH 2015
40
The215horsepower-rated electric
winchaccommodatesup to
580mof ropeon thedrumand,
whenworking in single fall, this
hoistingunit can lift loadsof
2.3 tonnes at up to256m
perminute.
FromGermany-basedmechanical
engineeringmanufacturerZollern
is an electricallydriven ropewinch.
Thewinchwasoriginallydesigned
for adrawworksona truckmounted
onshoredrillingdevice and isdesigned
withanasynchronousmotor anda
speciallydesigneddriveunit andgearbox.
Toaccommodateworkingon future
drilling rigs,whichwill offerdrillingdepths
of 5,000m, themotor andplanetarygear
havebeenhoused inside the ropedrum.
HolgerGraf, Zollernmarine technology
segmentmanager, says, “ThenewZollern
compact electricwinch canbeused in
each typeof crane, including shipboard
cranesorbulkmaterial handling cranes.
Inprinciple it is an electricallydriven
cranewinchwithan electricmotor that is
patented, is alsoon themodel. To
reducewearon themainwire rope,
twohydraulic cylinders allow for
the adjustment of the liftingheight
withoutmoving thedrumof the
hoistingwinch.
From cranemanufacturerPalfinger
is the rope tension control (RTC) and
the synchronised rope control (SRC)
system. TheRTC is anautomatic rope
tensioningdevice thatmakes it easier
to foldandunfold the cranewith the
rope reeved inand the fly jibmounted,
themanufacturer says. The system
automaticallyadjusts the rope length to
match themovementsof the crane.
Similar to theRTC, theSRC system
automaticallyadjusts the rope lengthand
maintains a constant distancebetween
thepulleyheadand thehookblock
duringoperationof the ropewinch. This
allows loads tobe traversedhorizontally
at a constant heightwithout theoperator
having toadjust the ropewinch. Sensors in
the rollerheadareused toavoid collisions
between thehookblockand thepulley
head. The system sends signalsdirectly to
thePaltronic150, a spokesperson explains.
“If theSRC is activated, it automatically
makes thenecessaryadjustments to ensure
that thedistancebetween thepulleyhead
and thehookblock remains constant
duringany cranemovements that lengthen
or shorten the rope length. If theknuckle
boomor fly-jib is lowered, theSRCagain
adjusts the ropewinch tokeepa constant
distancebetween the lowerblockand the
rollerhead,” a spokesperson fromPalfinger
adds. The systems are available for SH
cranemodels (SRC fromPK10002SHand
RTC fromPK27002SH).
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SamsonKZTM100 synthetic hoist rope
incorporated inside thedrum.”
The340kilowattmotor isoil-cooled
andhasbeenproduced in-house, ashas
the two-stageplanetarygear.Anadditional
hydraulic emergencydrivewith two spur
gear stageshasbeen installed toprevent
damage if themaindriveunitwere to fail.
Thewinchhas a cablepull on thedrum
of 160kNandamaximum speedof 600
metresperminute. It hasbeenapproved
byGerman technical inspectionauthority
TechnischerÜber-wachungsverein (TÜV).
Forwork in explosive environments, all
heat-generating componentshavebeen
enclosedandbraking temperaturesdonot
exceed200degreesCelsius.
The latestwinchdesign fromLiebherr
ison the300 tonne capacityLiebherrRL-K
7500 subseaknuckleboom crane. It can
handle loadsdown toawaterdepthof
3,600metres and it has a ropediameterof
82mm. To ensureoptimised ropeguidance,
the cranehas apatentedhorizontalwinch
shifting system,which, according to
Liebherr, guarantees the ideal fleet angleof
the ropeunder all load conditions inboth
hoistingand loweringoperations.Avertical
winch frame lifting system,which is also
TheZollernelectrically driven
ropewinch
ROPES&WINCHES
