CMAXwhichensure that thesuction
nozzlesand feetmovequicklyandflexibly
into their programmedpositions. Even
large loadsareacceleratedandbraked
dynamicallyandprecisely. 16
proportional valvesof typeVPWPcontrol
thesupplyandexhaust air in the
cylinders. TheCPXsystem is the
automationplatform, servingbothasan
electric terminal equippedwithcontrollers
CMAXandasavalve terminal equipped
withvalvesVTSA, for additional switching
functions in thesystem.
The laser scannersat eachendof the
tunnel cleaning trainaremovedbya
rodless cylinderDGCI-40with integrated
displacement encoder andaproportional
valveVPWP-8. The fast, precise interaction
between cylinder andvalvesupports
optimumpositioningof thescanners,
allowing them tosupplyaccuratedata
about theexpected tunnel profile to the
system controller.
Small space, safeoperation
Inaddition tomaking theswitch from
hydraulics topneumatics, Schörling
decided touse theeasy-to-install and
space savingdoublesub-baseVABP for
theveryfirst time. It replaces the
individual component solutions for
variousemergencystop functionsof
servopneumaticaxes thatwerepreviously
required. “Installedbetween thedrive
andpower valve, theVABPenables
different switchoff functions tobe
realisedusingonesub-base: stopping,
exhausting, reversing left or rightwith
reducedspeedandpressure
compensation,”explainsDaniel Eberhardt,
describing thesafetyadvantageofVABP.
Comparedwithsolutions that have tobe
assembledusing individual components,
thedoublesub-baseVABPand theproven
switchingvalves from the ISOseriesVSVA
havemade itmucheasier for thecustomer
toevaluate thesystemasper the
MachineryDirectiveEN ISO13849-1and
todetermine theperformance level that
canbeachieved.
Co-operation fromdayone
The latestmodel of the tunnel cleaning
train fromSchörling incorporating the
innovativeservopneumatic solution from
Festo isalreadybeingused inBeijing’s
underground rail system. Itsnetwork is
around460km long,making it thebiggest
in theworld. ProjectManagerDaniel
Eberhardt recalls thedesignprocessas
beingparticularlychallenging. Theprocess
from initial discussionswith the
underground rail operators inChina to
completionof the tunnel cleaning train
took just sevenmonths. “For us, itwas
hugely important thatwehadapartner
likeFesto, onwhomwe could rely
completely,”saysDaniel Eberhardt. “The
changeover fromhydraulics to
servopneumaticswasa totallynew
departure forusandwehad toplaceour
trust in the innovativesolutionand
expertiseprovidedby Festo.”
Onlya fewmonthsafter both companies
met atHannoverMesse2012, aprototype
for theservopneumaticswasdeveloped.
Thiswas thenused toproduce thefinal
product. Service technicians from Festo
deliveredand commissioned theentire
servopneumatic system formovingand
controlling thesuctionnozzles. In
addition to fast deliveryof the
technological hardware, theworldwide
serviceprovidedby Festowasamajor
sellingpoint for Schörling. For
maintenanceandservicework, Schörling
canquicklyaccess the Festoexpertise
availableworldwide. Thisensuresa clean
environment for peopleandmachines in
the tunnelsof underground rail networks
all over theworld.
SchörlingKommunal
GmbH
GöttingerHof 9
30453Hannover
Germany
Areaof business:
Development and construction
ofmetro tunnel cleaning trains
“Installedbetween thedriveand
power valve, thedoublesub-base
VABPallowsdifferent switchoff
functions tobe realised.”
Daniel Eberhardt, ProjectManager SchörlingKommunal GmbH
Issue26
trends inautomation
Synergies
32
–
33
is
infoservice
26-04
VTSAvalve terminal –PSI plus
