2008-03-21 ©SKF Slide 1SKF Mining, Mineral Processing & Cement
2008-03-21 ©SKF Slide 2SKF Mining, Mineral Processing & Cement
SKF solutions for vibrating screens
SKF 1 Industrial Team
2008
SKF Mining, Mineral Processing and Cement
2008-03-21 ©SKF Slide 3SKF Mining, Mineral Processing & Cement
SKF solutions for vibrating screens
• Bearings
• Seals
• Hydraulic assist
• Hydraulic pumps
• Alignment tools
• Lubrication
• Fault detection
• Reliability Systems
• Total Shaft Solutions
2008-03-21 ©SKF Slide 4SKF Mining, Mineral Processing & Cement
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
2008-03-21 ©SKF Slide 5SKF Mining, Mineral Processing & Cement
SKF Explorer performance class bearings
Offers longer service life through improved:
• Heat treatment
• Manufacturing
• Design
2008-03-21 ©SKF Slide 6SKF Mining, Mineral Processing & Cement
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
2008-03-21 ©SKF Slide 7SKF Mining, Mineral Processing & Cement
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
2008-03-21 ©SKF Slide 8SKF Mining, Mineral Processing & Cement
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
2008-03-21 ©SKF Slide 9SKF Mining, Mineral Processing & Cement
SKF Explorer with PTFE coated bore (VA406)
Features
• SKF Explorer performance class bearing
• Three-piece hardened steel cage system
• C4 internal radial clearance
• 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 )
• Longer service life
• Increased reliability for both bearings
22322 EJA/VA40622324 to 22340 CCJA/W33VA406
Interchangeable with 452 and VA405 bearings
2008-03-21 ©SKF Slide 10SKF Mining, Mineral Processing & Cement
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
453326 CACM2 453326 CCJA/W33VA405 130 280 93 19 155 255453326 CCJA/W33VA406
453328 CACM2 453328 CCJA/W33VA405 140 300 102 16 165 270453328 CCJA/W33VA406
453330 CACM2 453330 CCJA/W33VA405 150 320 108 20 180 290453330 CCJA/W33VA406
453332 CACM2 453332 CCJA/W33VA405 160 340 114 22 190 310453332 CCJA/W33VA406
DD1
d2d
B W
2008-03-21 ©SKF Slide 11SKF Mining, Mineral Processing & Cement
SKF CARB in vibrating screens
Features• Free axial internal movement
(eliminate axial loading)
• Hardened steel cage (VG114)
• C4 internal radial clearance
• Increase dimensional precision (reduced tolerances)
Benefits• Allows a press fit on shaft to eliminate fretting
corrosion
• Longer service life
• 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
2008-03-21 ©SKF Slide 12SKF Mining, Mineral Processing & Cement
Torodial bearing reduces internal loading
Fa = Fr x μ
F
F
a
r Fr
Fa = 0
2008-03-21 ©SKF Slide 13SKF Mining, Mineral Processing & Cement
Two Solutions for a traditional problem
SKF Explorer VA405 roller bearing and CARB bearing
SKF Explorer VA405 and VA406 spherical roller bearings
2008-03-21 ©SKF Slide 14SKF Mining, Mineral Processing & Cement
SKF Copperhead
SKF Copperhead for mining, mineral
processing & cement
2008-03-21 ©SKF Slide 15SKF 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
2008-03-21 ©SKF Slide 16SKF Mining, Mineral Processing & Cement
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
2008-03-21 ©SKF Slide 17SKF Mining, Mineral Processing & Cement
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
2008-03-21 ©SKF Slide 18SKF Mining, Mineral Processing & Cement
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
2008-03-21 ©SKF Slide 19SKF Mining, Mineral Processing & Cement
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
2008-03-21 ©SKF Slide 20SKF Mining, Mineral Processing & Cement
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)
2008-03-21 ©SKF Slide 21SKF Mining, Mineral Processing & Cement
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
2008-03-21 ©SKF Slide 22SKF Mining, Mineral Processing & Cement
• Improve productivity and profitability
• Improve health and safety
• Improve the environment
SKF solutions for vibrating screens
® 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]
2008-03-21 ©SKF Slide 23SKF Mining, Mineral Processing & Cement