One-Way CEBMAG Backstops Drive Protection - SLT Co

One-Way CEBMAG®

BackstopsFor Kiln Emergency

Drive Protection

2 _____________________________________________________________ Marland Clutch (800-216-3515) www.marland.com

Operating Details

The Need For CEBMAGBackstopsFor some time, the trend in the cementand other pyro-processing industries hasbeen toward larger and more efficientkilns. Since these kilns operate 24 hoursper day, month after month, it has beenimportant to conserve power and avoiddown time as much as possible.

The high degree of efficiency in themechanical power transmission that hasevolved also means that the kiln can rollback due to the large off-center mass ofmaterial in the kiln when power failureoccurs or at any time the main drive isshut down. Uncontrolled rollback carriesthe danger of centrifugal explosion of themain drive components since they maybe oversped to many times the normalforward speed.

Another consideration to be made duringmain drive shutdown is the prevention ofkiln distortion due to the hightemperatures. An emergency drive can beutilized to provide forward rotation at areduced speed, both to prevent distortionand also to empty the contents of the kilnbefore it becomes impacted to the lining.

Marland CECON clutches and CEBMAGbackstops provide automatic, remoteemergency operation in case of mainelectric power failure. Their use providesfor controlled reversal of the kiln andautomatic changeover to emergencydrive for forward rotation at reducedspeed.

The first Marland clutches installed on acement kiln went into operation over 25years ago. Since that time, many of thelargest kilns in this country andthroughout the world have been providedwith CECON and CEBMAG units.

For more detailed information on CECONclutches refer to CECON catalog P-1471-MC.

GeneralThe Marland One-Way CEBMAGBackstop is primarily designed forapplication in kiln emergency drivesystems in conjunction with the MarlandCECON Clutch. The requirements of sucha system are:

A. Provide automatic means forcontrolling reversal of kiln, duringplanned or emergency shutdown.The unit must not onlyautomatically hold the kiln fromfree reversal, as any backstop cando, but also, it must provide forcontrolled kiln reversal when thebackstop is released. Duringcontrolled reversal, full-timeautomatic protection from over-speeding of the main andemergency drive systems isnecessary in order not to run therisks of personal injury or damageto equipment through centrifugalexplosions of motors, engine fly-wheels, or couplings. This over-speed is caused by the rollbackfrom almost free response togravity of the large off-center massof material in the kiln, and may bemany times the normal forwardload-carrying speed.

B. Must be able to operateautomatically under extremely wet,dusty abrasive or other adverseatmospheric conditions inunprotected outdoor installations.

To the best of our knowledge, theCEBMAG unit is unique in that it is theonly unit of its type to have in-built in onepackage, an automatic freewheeling one-way clutch on the main emergency driveshaft (cam shaft) and two brakes (oneelectromagnetic and one centrifugal)mounted on the secondary shaft (wormshaft) that are automatically engagedwhen the main (cam) shaft tries to reversedirection of rotation. If these brakes wereplaced elsewhere in the emergency drivesystem, rather than on the secondary(worm) shaft, one or both of the brakeswould be constantly engaged regardlessof direction of kiln rotation.

The electro-magnetic brake HOLDS thereverse load caused by the kiln, and is ofthe disc type, with spring set andelectrical release. This permits centralstation control. An external manualrelease is also furnished to allow for on-job-site release. The automatic actingcentrifugal brake retards the reverse loadcaused by the kiln when theelectromagnetic brake is released, andallows controlled reversal of the kiln inorder to protect from over-speeding ofthe main and emergency drive systems.

The Marland One-Way CEBMAG Backstop

Cover: Marland One-Way CECON clutch andCEBMAG Backstop on modern cement kilnprovide for emergency drive rotation in caseof main power shutdown. Drive arrangementas per Alternative D, page 5.

Marland Clutch (800-216-3515) www.marland.com _____________________________________________________________ 3

Design Features and Size Selection

Design FeaturesA. The freewheeling clutch is

contained in a completely dustand oil tight horizontally splithousing, with provisions forsupporting the freewheeling clutch,cam shaft, and secondary (worm)shaft. Liberal housing area isprovided to insure adequatecooling of the lubricant.

B. The freewheeling clutch elementsare of the fully phased roller andcam type, consisting of cylindricalrollers contained in a precisionmachined cage, and actuated toengage all rollers simultaneouslybetween the outer race and theinclined precision ground planes ofthe cam shaft.

C. A precision machined, reversiblehigh helix angle worm and gearset is used to transmit the loadduring kiln reversal through theengaged automatic one wayclutch to the brakes mounted onthe secondary (worm) shaft.

D. Shafting is provided with adequatesealing to guard against loss oflubricant or entry of foreign matterwhen shafts are not alwayshorizontal as on some kilninstallations.

E. An oil level indicator, which isclearly visible and can be observedwhether the unit is in operation oridle, is provided to show correctlevel to be maintained in thereservoir of the enclosed housing.The static oil level provides alarge volume of oil many times thecapacity of an ordinaryfreewheeling clutch.

F. The oil slingers on the cam shaftprovide continuous self-lubricationthrough centrifugal displacementof the oil in the reservoir duringfreewheeling or driving rotation toinsure abundant lubrication of allworking parts instantly uponstarting.

G. A drain valve is provided for easysampling of the lubricant to helpdetect the presence of any foreignmatter and to permit withdrawal ofany such impurities from thereservoir.

H. A breather-filter fastened into theoil fill cap on the top of thehousing is provided to prevententry of abrasive dust or moistureinto the unit during a change ofatmospheric temperature andduring a change in operatingtemperature of the atmosphere inthe unit.

I. The electromagnetic brake holdsthe reverse load caused by the kilnduring planned or emergencyshutdown. This brake is of the disctype with spring set and electricalrelease. This permits centralstation control. An external manualrelease is also furnished to allowfor on-job-site release.

J. The centrifugal brake automaticallyengages the brake drum at a pre-determined speed through thecentrifugal action of the individualbrake shoe segments and againsttheir retaining springs, caused bythe kiln reversal when theelectromagnetic brake is released.This action limits the main andemergency drive systems to a safecontrolled reversal speed.

K. A brake drum of liberal proportionsis provided so as to adequatelyserve as a heat sink when thecentrifugal brake engages.

Size Selection DataSelection of the CECON Clutch andCEBMAG Backstop is generally made byour factory since the auxiliary and maindrive arrangements of a typical installationcontain variable conditions and specialconsiderations. The informationnecessary to properly selection theseunits is as follows:

A. Main Motors:Number of motorsHP of each motorRPM of each motor

B. Auxiliary Drive:Number of drivesHP of each driveRPM of each driveType: Engine or Electric Motor

C. Auxiliary Reducer Ratio

D. Main Reducer Ratio

E. Girth Gear and Pinion Ratio

F. Amount and Direction of Kiln SlopeWith Respect To DriveArrangement

G. Voltage To Be Supplied ToCEBMAG Electric Brake

H. Micrometered Shaft Diameters, IfCouplings Are Supplied ByMarland:

1. Auxiliary drive shaft

2. Auxiliary reducer high-speedshaft

3. Auxiliary reducer low-speedshaft

4. Main reducer high-speed shaft

I. Direction Of Rotation Of CEBMAGBackstop And CECON ClutchViewed Facing Input Shafts OfThese Units.

Special RequirementsIn nearly 50 years as the recognizedleader in the design and manufacture offreewheeling clutches, the Marlandengineering staff has been given manyunusual and difficult requirements forclutches and backstops. This hasresulted in special designs to meet thoseexacting requirements. If your needscannot be filled by a standard item, giveus the engineering details. It may be thatwe already have a solution to yourproblems, and if not, we’ll go to work andfind one.


Kiln Emergency Drive Arrangements

CECON clutch and CEBMAG backstopon this modern cement kiln emergencystand-by drive is completely automatic inoperation for remote, central stationcontrol. CEBMAG backstop preventsuncontrolled reversed runback of kiln.Drive arrangement as per Alternative A.

43

5

7

2

1

6

8 9

WithHoodedShaft

Alternative A


Kiln Emergency DriveAlternative Arrangements

6 7

7

7

5

5

5

6

6

8

8

8

9

9

9

WithHoodedShaft

IntermediateShaft

6 75 8 9

Alternative B

Alternative C

Alternative D

Alternative E

Part Description

1 Kiln

2 Kiln Drive Pinion

3 Main Drive Speed Reducer

4 Main Drive Motor

5 Marland One Way CECON Clutch (A) permits emergency drive to remain stationary or to run while main drive is in operation (B) engages emergency driveautomatically to main drive to rotate kiln when drive is off (C) engages automatically to rotate emergency drive when kiln reverses.

6 Emergency Drive Speed Reducer

7 Marland One Way CEBMAG Backstop (A) holds kiln from reversing when either main drive or emergency drive is shutdown (B) controls reversal of kiln whenbrake is released (C) permits emergency drive to rotate kiln

8 Fluid or Centrifugal Clutch with Gear Type Coupling

9 Emergency Drive Engine or Electric Motor


Marland One-Way CEBMAG Backstops

Gear-Typedouble engagement

flexible coupling

Emergencydrive shaft

Shaft Gap** Shaft Gap**

D

Cam Shaft with Marland Clutchdirection of freewheeling rotation of cam shaftto be same as Emergency Drive Rotation, in orderto drive kiln at reduced speed thruemergency reducer.

Gear-Typedouble engagementflexible coupling

Emergencyreducer shaft

UsableShaft

Length

UsableShaft

Length

E* E*

F F

D

TT

A A

G GU U

Rated Torque Shipping CEBMAG Backstop Capacity Oil Capacity Pints Weight

Size lb.ft. lbs.

5C-W 500 7 410

1M-W 1,000 7 530

2M-W 2,000 10 690

4M-W 4,000 13 920

Consult applicable Local and National Safety Codes for proper guarding of rotating shafts andcouplings.

* Shaft Dia. + .0000/-.0010Coupling Bore -.0010/-.0015

** Shaft gap per coupling Manufacturer or customer specification.


Dimensions and Data

C

J

H

B

L

X dia.Centrifugal brake

speed limitingcontrol functions

only duringkiln reversal

P

N

O

Breatherfilter

Oil fill plug

K M

Electromagnetic disc brakespring-set and magnetically released,

with external manual release to beused in case of current failure.

6

V

W

Drain valve

Static oil level gageStatic level indicated on housing

1/2 NPTLead wire outletfor externalconnection tocontrol circuit

43/4Clearancerequired to

removehousing

N

P

O

CEBMAG Dimensions in Inches (For Reference Only)Backstop

Size A B C D E F G H J* K* L M* N O P T U V* W X

5C-W 93⁄4 53⁄4 191⁄2 1⁄2 x 1⁄4 2 35⁄16 41⁄8 5 113⁄8 101⁄4 11⁄2 143⁄8 43⁄4 53⁄4 2 53⁄8 43⁄8 93⁄8 53⁄8 13⁄16

1M-W 93⁄4 53⁄4 191⁄2 1⁄2 x 1⁄4 2 35⁄16 41⁄8 5 13 103⁄4 11⁄2 147⁄8 43⁄4 53⁄4 2 53⁄8 43⁄8 93⁄8 53⁄8 13⁄16

2M-W 103⁄4 63⁄4 21 5⁄8 x 5⁄16 21⁄2 37⁄8 45⁄8 6 15 111⁄2 13⁄4 191⁄2 51⁄4 63⁄4 3 61⁄8 43⁄4 153⁄4 53⁄8 15⁄16

4M-W 113⁄4 73⁄4 24 3⁄4 x 3⁄8 25⁄16 51⁄8 53⁄8 7 17 121⁄2 13⁄4 211⁄4 6 73⁄8 3 61⁄2 5 153⁄4 61⁄8 11⁄16

* These Dimensions Subject To Change Depending Upon Electrical and Other Variables.

MMaarrllaanndd CClluuttcchh485 S. Frontage Rd., Ste 330 • Burr Ridge, IL 60527630-455-1752 • Fax: [email protected]

For application assistance:1-800-216-3515

P-1470-MC 11/05 Printed in USA

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One-Way CEBMAG Backstops Drive Protection - SLT Co