rulmenti ecrane vibrato are skf

2008-03-21 ©SKF Slide 1SKF Mining, Mineral Processing & Cement


SKF solutions for vibrating screens

SKF 1 Industrial Team

2008

SKF Mining, Mineral Processing and Cement



• Bearings

• Seals

• Hydraulic assist

• Hydraulic pumps

• Alignment tools

• Lubrication

• Fault detection

• Reliability Systems

• Total Shaft Solutions


Typical vibrating screen problems

Heat from shaft

Expa

nsio

n

Expa

nsio

n

Expansion

The clearancefit is reduced

The clearancefit is reduced

Start up of a vibrating screen

This situation gives axial preloaded bearings


SKF Explorer performance class bearings

Offers longer service life through improved:

• Heat treatment

• Manufacturing

• Design


22324 – 22340 CCJA/W33VA405

22315 – 22322 EJA/VA40522308 – 22314 E/VA405

SKF Explorer bearing for vibrating screens (VA405)

• SKF Explorer performance class

• Three-piece hardened steel cage system

– guided in outer ring

• C4 internal radial clearance

• ISO P5 bore

• ISO P6 outer diameter tolerances

• Made only in Europe until 2003

- now also SKF Hanover


SKF Explorer bearing for vibrating screens (VA405)

Benefits

• Longer service life

• Lower internal friction and operating temperatures

• Opportunity for down-sizing

• Reduced maintenance and repair costs

• Reduced down time

• Interchangeable with 452 bearingsObservations

10 °C ( 18 °F ) cooler operating temperatures

Minimum 2 x longer service life

Successful downsizes from 233 (453) series


Analytical studies in friction

0.37

0.7

2

Slid

e/ro

l l f

ric t

ion

SKF ExplorerVA405 bearing

SKF has lowest f

riction/lowest

temperatures

High slide to roll friction results in higher bearing operating temperatures

SKF VA405/VA406 screen bearings operate at lower

temperatures than other designs.- 10°C (20°F)

Results show three piece cage system guided in outer ring has lowest friction


SKF Explorer with PTFE coated bore (VA406)

Features

• SKF Explorer performance class bearing

• Three-piece hardened steel cage system


• Higher bearing precision

• PTFE (Polytetrafluorethylene) coating in bore

Benefits

• Eliminate fretting corrosion on shaft

• Eliminate parasitic axial loading of both bearings (locating and non-locating )


• Increased reliability for both bearings

22322 EJA/VA40622324 to 22340 CCJA/W33VA406

Interchangeable with 452 and VA405 bearings


Kits include:(1) SKF Explorer 223 series VA405 or VA406 bearing(1) Inner ring spacer(1) Outer ring spacer

SKF Explorer 453 Series CCJA/W33VA405 kits

Old design New Kits Dimensionsd D B W d2 D1

453322 CACM2 453322 EJA/VA405 110 240 80 12.1 130 220453322 EJA/VA406

453324 CACM2 453324 CCJA/W33VA405 120 260 86 20 145 235453324 CCJA/W33VA406





DD1

d2d

B W


SKF CARB in vibrating screens

Features• Free axial internal movement

(eliminate axial loading)

• Hardened steel cage (VG114)


• Increase dimensional precision (reduced tolerances)

Benefits• Allows a press fit on shaft to eliminate fretting

corrosion


• Reduced maintenance and repair costs, reduced down time

7 sizes available for vibrating applications (also K bore)

CARB operated in screens for years in various locations (Sweden, Australia, Austria)

C 2314 C4/VG114C 2315 C4/VG114C 2316 C4/VG114C 2317 C4/VG114

C 2318 C4/VG114C 2319 C4/VG114C 2320 C4/VG114


Torodial bearing reduces internal loading

Fa = Fr x μ

F

F

a

r Fr

Fa = 0


Two Solutions for a traditional problem

SKF Explorer VA405 roller bearing and CARB bearing

SKF Explorer VA405 and VA406 spherical roller bearings


SKF Copperhead

SKF Copperhead for mining, mineral

processing & cement


Gear faults

Lubrication problems

Overloading

Bottoming out

Bearing faults

Loose screen mesh

Loose components

Screen not running / broken belt if connected to PLC

SKF Copperhead for vibrating screens


Available seals For d < 200 mm (8 inch) WaveSeals

CRW1 and and CRWA1 (includes exclusion lip)

Material options Temperature limitsNitrile (NBR) -50 °C to 100 °C (-58 °F to 212 °F)Duratemp (HNBR) 150 °C (300 °F)Longlife (VITON) 200 °C (392 °F)

Select seal material option based on operating temperature (seal temp limit > mill temperature )Seal performance is influenced by the environment, lubrication, shaft and housing condition, and seal type

CRW1 CRWA1 SPEEDI-SLEEVE

Seals for housings, gearboxes & motors

V-ring seal


SKF seals for vibrating screens

• V-ring type VR2 - Extra wide seating

Customer value• Reliable operation• Reduced maintenance and repair costs

• radial shaft type CRW1 - WaveSeals

• Design recommendations for the labyrinth


SKF Maintenance Products

Product Types

• Hydraulic pumps & injectors

• Hydraulic nuts

• Laser Shaft alignment

• Laser Belt alignment

Benefits

• Reduce maintenance & repair costs

• Reduce downtime

• Improve safety

Hydraulic nuts:HMVC .. E

Hydraulic nut rental:ex: HMVE 48E/rental

Hydraulic pumps:729124 (for nuts O HMVC 54E)729124 DA (with digital gauge)TMJL 50 DA (for nuts O HMVC 200E)

TMEB 2Laser Belt Alignment

TMEA 2 Laser Shaft Alignment


Lubrication of vibrating screens

Oil bath/ oil splash • Operating T < 75°C => oil ISO VG 150• Operating T > 75°C => oil ISO VG 220• EP, rust inhibitor, and anti-foam additives

Grease • LGHB2 for higher temperatures• LGEP2 for normal conditions


SKF resources

www.aptitudexchange.com

SKF @ptitude Exchange is SKF's knowledge source for asset maintenance and reliability expertise. White papers, interactive services, tutorials, etc., are now at your fingertips.Register for FREE, and learn about subscriptionoptions.

See www.skf.com for additional solutions

DSP is SKF’s tool to document the value

and Return on Investment (ROI) for its solution.

SKF Documented Solutions program (DSP)


SKF solution for vibrating screens

•SKF bearings for vibrating applications

•SKF Copperhead fault detection

•Lubrication

•SKF Explorer spherical roller bearing

•CARB toroidal roller bearing

•Seals

•Maintenance Products & Services


• Improve productivity and profitability

• Improve health and safety

• Improve the environment


® SKF, CARB, @ptitude, Speedi-Sleeve and SYSTEM 24 are registered trademarks of the SKF Group

The contents of this publication are the copyright of the publisher and may not be reproduced (even extracts) unless prior writtenpermission is granted.

Every care has been taken to ensure the accuracy of the information contained in this publication but no liability can be accepted for any loss or damage whether direct, indirect or consequential arising out of use of the information contained herein.

© 2008 SKFGroup Version 1/2/2008

For more information, contact your SKF Authorized Distributor,

your SKF Representative, or e-mail us at [email protected]

rulmenti ecrane vibrato are skf

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