Rothe Erde Eddy Current Monitoring System. Applications ... · The system consists of: •...

Rothe Erde Eddy Current MonitoringSystem. Applications: Offshore Equipment, TunnellingMachines, Construction Equipment.

A ThyssenKruppTechnologies

companyRothe Erde

TK

Rothe Erde Eddy Current Monitoring System (ECMS).

OffshoreEquipment

ConstructionEquipment

TunnellingMachines

The Rothe Erde Eddy Current ConditionMonitoring System is a bearing-inte-grated measuring system to check theraceways and radii of all designs oflarge-diameter bearings, predominantlyroller bearings, for possible damagesuch as wear, pittings and cracks.

The system can be used for new bear-ings as well as for retrofit programs.Applications for the Rothe Erde EddyCurrent Monitoring System are tunnell-ing machines, construction- or offshoreequipments.

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5.301

3.274

4.761

Power Supply

230 V/50Hz

Storage and Visual Display

Disk withECMSData

Eddy CurrentData Evaluation andReporting System

ECMSGroundstation

Computing Storageand Visual Display

Printout

ECMS-equipped large-diameter anti-friction bearings are linked up with themeasuring instruments via an environ-mentally protected, isolated plugconnection.

The basic requirement for running themeasurements is an ECMS ground-station providing power supply anddata transfer.

The data can either be stored ondiskette by laptop or visually displayedon site. If data processing and evalu-ation are not possible at the equip-ment site, the diskette may be evalu-ated at a central point or at Rothe Erde,respectively.

The power generator integrated in thegroundstation supplies electricity to thestationary ring with the primary coil.From here, high-frequency power is in-ductively coupled to the secondary coiland then to the supply module which islocated in the cage inside the bearingand distributes the power to the individ-ual sensors. The signal measured overthe entire circumference of the bearing(720 ° rotation) is telemetrically trans-mitted from the supply module via theantenna system of the secondary coilback to the primary coil. From there,the data are fed to the groundstationreceiver for central data evaluation.

Inside Bearing

moving Cage

Interface

Hardware

Outside

Bearing

GroundstationReceiver and

Power Generator

DataStream

EnergyInput

Data Acquisition andData Processing Equipment

Primary Coil withAntenna System

Telemetry and Secondary CoilPower Supply

Eddy Current Sensors

System componentsand sensors

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Inspected Raceway

U [Volt]

RacewayS [mm]

U [Volt]

RacewayS [mm]

U [Volt]

RacewayS [mm]

U [Volt]

RacewayS [mm]

Transmitter

Data Acquisition Online Display

Data Processing

Receiver

Data Storing and Comparisonwith earlier Measurements

U [Volt]U [Volt] U [Volt] U [Volt]

simultaneousEvaluation of

opposite Raceways

simultaneousEvaluation of

opposite Raceway

Sensors

Telemetry

Computer

Inspection

Results

The diagram illustrates the flow of thedata and their evaluation. The sensordata are transmitted by telemetry andthen centrally processed with particularemphasis on the simultaneous evalua-tion of the opposite raceways, therebyeliminating any influences from tinycage movements. The data obtainedare then compared with the base meas-urement or earlier measurements.

In this connection it is important toknow that the measurements will not beaffected by nonmetallic substances.Any pittings present in the grease willchange their position with each rotationand are, therefore, identifiable.

Three-row roller bearing slewing ring

Single-row ball bearing slewing ring

Cross-roller bearing slewing ring

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… for Offshore Equipment.

The system consists of:• Groundstation

including Power Supply and Receiver

• Computer with WindowsOperating System with serial and parallel Interface

• Printer for Documentation• Contactless Eddy Current Sensors• Power Supply and Telemetry Modul

Roller bearing slewing ring

5.301

3.274

4.761

Power Supply

230 V/50Hz


Disk withECMSData


ECMSGroundstation


Printout


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Rothe Erde ball and roller bearings areglobally recognized for their outstandingperformance and reliability in offshore-cranes.

These bearings have to meet rigorousrequirements of international classifi-cation companies and of course of theusers. The Rothe Erde Eddy CurrentMonitoring System is a measurementsystem, which is fully integrated into thebearing. It monitors the condition of thebearing without requiring any time-con-suming and cost-intensive intervention.The system is widely used in the off-shore industry since 1982 not only foroffshore cranes but also for offshore oilmooring applications like FPSO’s andfor bearing diameters up to 8,000 mmdiameter.

Retrofitting existing bearings with themonitoring system is no problem, as itsinstallation leaves the installed dimen-sions and the dimensions of the bear-ing itself intact.

Kenz Cranes B.V., Zaandam, The Netherlands




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... for Tunnelling Machines.






5.301

3.274

4.761

Power Supply

230 V/50Hz


Disk withECMSData


ECMSGroundstation


Printout


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It is Rothe Erde’s objective to developdesign and produce optimum cutter-head bearings meeting all requirementsof specific applications such as hard-rock or soft-rock drilling.

The selection of the bearing designdepends on load circles, shock-factor,torque, speed, etc. Small tunnellingmachines are mostly fitted with four-point contact ball bearings, the enor-mous loads involved in larger machineswill in the majority of cases, requirethree-row roller bearings. Rothe Erdebearings have proven their reliability inmore than a 1,000 cases as for in-stance in the Channel-tunnel projectand the recently commissioned Trans-Tokyo Bay Highway. The Rothe ErdeEddy Current Monitoring System allowsto monitor the bearing condition at anytime during the drilling operation. Tun-nelling machines require a very highreliability, because any repair would beextremely cost-consuming.

With this system the condition of thebearing may be checked and if neces-sary, respective measures like reducingthe forces can be taken.

Lovat Tunnel Equipment Inc, Etobicoke, Ontario, Canada




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… for Construction Equipment.






5.301

3.274

4.761

Power Supply

230 V/50Hz


Disk withECMSData


ECMSGroundstation


Printout


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The breakneck speed of development inthe construction equipment industry inrecent years, in particular with regard tohydraulic excavators, has resulted inever larger and heavier machines. Thesemammoth earth moving machines havelittle in common with the small conven-tional hydraulic excavators that we arefamiliar with and are predominantly usedas overburden excavators in opencastmining in the extraction of iron ore, coal,oil sand, etc.

They must be extremely reliable andlong-lived, even under most extremeworking conditions. It is obvious thatsuch equipment needs custom-designedlarge-diameter antifriction bearings thatare capable of sustaining these extremeloads and of meeting such high servicelife requirements, in theory as well as inpractice.

This is another application where theRothe Erde ECMS system which allowsperiodical monitoring and control hasproven extremely useful. The measureddata can be stored and compared withearlier measurements again and again.It is also possible to transfer the data bysatellite to a central monitoring station.

O & K Mining GmbH, Dortmund, Germany




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Design engineering and development.

Offshore technology, tunnelling ma-chines and also construction equipmentdemand the utmost in performanceand structural safety from Rothe Erdebearings.

Finite element analysis has shown tobe a reliable method for determiningthe occurring stresses in new bearingdesigns as well as for analysing loaddistributions and load transfer into themating structures, that are otherwisedifficult to assess. Finite element ana-lysis is an equally valuable tool forbearing optimization.

5.301

3.274

4.761

Power Supply

230 V/50Hz


Disk withECMSData


ECMSGroundstation


Printout


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To ensure that Rothe Erde bearings willcontinue to enjoy their reputation for re-liability and economy in extreme situa-tions, our R&D Centre subjects all newbearing designs to relentless and vigor-ous testing.

We are known for our pioneering devel-opment work and search for advanced,practicable solutions. The latest find-ings, experience and innovation combinein the creation of new technologies.

Segmental bearings of various types,like compact or sandwich bearings.Corrosion-proof bearings withspecialsealing systems. Lubrication samplingand bearing condition monitoringsystems.

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Quality management.

Rothe Erde bearings meet the highesttechnical requirements. This applies inparticular to offshore technology, tun-nelling machines, construction equip-ment and many other applications.

The Rothe Erde quality system is ap-proved by all national and internationalclassification and acceptance companiesand complies with DIN EN ISO 9001.

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Our quality planning begins with ourfirst contact with the customer. Wedetermine whether the customer’srequirements or concepts can be safelytransformed into a viable product.Following clear definition of the require-ments, the quality features are definedin cooperation with the responsibledepartments and laid down in draw-ings, work plans, test specifications,etc., including packaging and customerservice.

Internal audits guarantee productionquality and the functional safety of ourquality system. The audit results com-bined with the quality data stored in theEDP systems permit effective qualitycontrol.

Regular staff training keeps us alert tothe ever increasing requirements andraises quality awareness throughout ourcompany.

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Rothe Erde

Rothe Erde GmbHTremoniastrasse 5-11D-44137 DortmundPhone: +49 (2 31) 186 -0Fax: +49 (2 31) 186 -25 00E-mail: [email protected]: www.rotheerde.com

BerlinRothe Erde GmbHGeschäftsstelle BerlinWittestrasse 30 JD-13509 BerlinPhone: +49 (30) 89 79 14-18Fax: +49 (30) 89 79 14-33E-mail: rotheerde.gsberlin@

tkt-re.thyssenkrupp.com

BrazilRobrasa Rolamentos EspeciaisRothe Erde Ltda.Rua Lidia Blank, No. 48BRA-CEP 09913-010, Diadema, São PauloPhone: +55 (11) 40 57 48 77Fax: +55 (11) 40 55 38 92E-mail: [email protected]: www.robrasa.ind.br

ChinaXuzhou Rothe Erde Slewing Bearing Co., Ltd.Wanzhai, Northern Suburb,VRC-Xuzhou 221007, JiangsuPhone: +86 (5 16) 7 76 71 70Fax: +86 (5 16) 7 76 90 00E-mail: xuzhou_rothe_erde@

xreb.comInternet: www.xreb.com

FranceRoballo France S.à r. l.30, Boulevard BelleriveF-92566 Rueil Malmaison CEDEXPhone: +33 (1) 41 39 00 90Fax: +33 (1) 41 39 00 99E-mail: [email protected]

NorthRothe Erde GmbHGeschäftsstelle NordAm Pferdemarkt 31D-30853 LangenhagenPhone: +49 (5 11) 7 25 35 69-0Fax: +49 (5 11) 7 25 35 69-9E-mail: rotheerde.gsnord@


SouthRothe Erde GmbHGeschäftsstelle SüdAm Ostkai 15D-70327 StuttgartPhone: +49 (7 11) 3 27 79 19-0Fax: +49 (7 11) 3 27 79 19-9E-mail: rotheerde.gssued@


Great BritainRoballo Engineering Co. Ltd.Mill HillNorth West Industrial EstateGB-Peterlee, Co. Durham SR8 2HRPhone: +44 (1 91) 5 18 56 00Fax: +44 (1 91) 5 86 90 96E-mail: [email protected]: www.roballo.co.uk

IndiaRothe Erde GmbHLiaison Office India6 E, „Gee Gee Emerald“No. 151, Village RoadNungambakkamIND-Chennai 600 034Phone: +91 (44) 8 23 63 14Fax: +91 (44) 8 23 56 55 E-mail: re_india@giasmd01.

vsnl.net.inInternet: www.rotheerdeindia.com

ItalyRothe Erde-Metallurgica RossiS.p.A.Viale Kennedy, 56I-25010 Visano (Brescia)Phone: +39 (0 30) 95 20-1Fax: +39 (0 30) 95 20- 3 00E-mail: [email protected]: www.rotheerde.it

JapanNippon Roballo Co., Ltd.Atagoyama-Bengoshi Bldg. 6-7Atago 1-ChomeJ-Minato-ku/TokyoPhone: +81 (3) 34 34 43 41Fax: +81 (3) 34 34 43 40E-mail: [email protected]: www.roballo.co.jp

SpainRoteisaRothe Erde Ibérica S.A.Carretera Castellón, km. 7Polígono Industrial „La Cartuja“E-50720 La Cartuja Baja (Zaragoza)Phone: +34 (9 76) 50 04 80Fax: +34 (9 76) 50 01 54E-mail: [email protected]: www.roteisa.es

USARotek Incorporated1400 South Chillicothe Rd.P.O. Box 312USA-Aurora, Ohio 44202Phone: +1 (3 30) 5 62 40 00Fax: +1 (3 30) 5 62 46 20E-mail: [email protected]: www.rotek-inc.com

Head Office

Offices in Germany

Subsidiaries

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Rothe Erde Eddy Current Monitoring System. Applications ... · The system consists of: •...

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