parts and functions of a conveyor system
TRANSCRIPT
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Parts and Functions of a ConveyorSystem
©2012 Dr. B. C. Paul
Note- These slides include figures and tables taken from the Cone!or "#ui$ment
%anufactures &ssociation. Credit is gien for these figures and tables. These slides
also include material from the authors o'n earlier 'ork.
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Major Components ofConveyor • Long Continuous belt
• Carried on rolls - rollers held by frame• Belt wrapped around pulleys at ends
• Pulleys coupled to gears and motors
• Peripheral Devices to drop on belt,
direct around corner, clean, discharge
etc.
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Conveyor Parts
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Conveyor Parts
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How Conveyors Function
• aterial !alls on moving belt that
carries it along• " continuous haulage system that is not
limited by cycles of batch movement
• #e$uires a continuous frame andstructure before can transport material
over route
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Significant Variations
• Belt may ride on a frame with air holes -
a compressor blows air under belt. Beltrides on a cushion of air.
• #ollers wrap belt entirely around
material - used to allow verticalconveying of material
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Conveyor Belting Parts
• Carcass - woven fabric or material for
tensile strength• %&ims - rubber layers between carcass plys
• Bra&er - fabric coat above carcass to brea&
impact of load
• 'op Cover - " rubber that resists cutting
abrasion and sometimes chemical action
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Conveyor Belting Types
• ulti-Ply - multi-ply carcass separated by s&ims -
traditional - trade-off between stiffness and
strength
• #educed Ply - comple( interwoven carcass notdependent on separate plys thinner less stiff for
same strength
• %teel - carcass lengthwise steel belts - high tensile
strength - heavy ores long runs
• %olid )oven - Carcass impregnated with
elastomer
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Conveyor Belting Elastomers
• ost *lastomer Covers in ining for
bump and abrasion resistance - goodnatural or synthetic rubber
• +iled %to&er Coals may need chemical
resistance - neoprene rubber
• ot process +res may need heat
resistance - chec& the carcass too -
usually limit to / of rated
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Elastomer Covers
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Conveyor Belting Splices• echanical
0 !ast
0 Done by and
0 *asily done and undone 1even when don2t
want it undone3 0 collects dirt looses strength
• 4ulcani5ed
0 6eeds big machine and time 0 +nce done hard to undo
0 Provides %uperior %trength
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Idlers
• %upports Belt and aterial Load
• Built with 0 %haft surrounded by bearings
0 'hen roll of steel or rubber
• 'wo main types 0 Carrying for material and belt
0 return supports belt on return trip
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Idler Size and Duty
• #ated by Diameter
0 ranges 7 to inches
0 smaller is less costly but higher wear and
frictional losses 0 inches common for mining
• #ated by )eight Carriage
0 ranges " to * for increasing duty 0 " and B light C and D heavy duty * e(tra
0 B and C common for mining
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Carrying Idlers
• 8sually troughed with 9 e$ual si5e rollerson a frame in mining applications
0 %ome suspended catenary systems have
rollers
• 'roughs usually :; , 9, 7 degrees
0 Deeper trough more volume
0 #e$uires thinner belt to lay in trough which
limits strength
0 9 common choice for mining
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Carrying Idlers
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eturn Idlers
• 8sually !lat and one piece
• %ometimes two piece 4 for belt training• %piral roll to self and belt clean
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Specialty Idlers
• <mpact <dlers for ta&ing material
dropping onto belt• Belt 'raining 1'raining means &eeping
in line in trough3
0 Can put idler off center to pull to side 0 Can put wheels on edge but wear belt
0 Can put v return to pull one way or other.
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Pulley
• Li&e #oller only belt wraps around
• ead Pulley - turns belt bac& around toreturn - may be coupled to drive
• 'ail Pulley - turns empty belt around for
loading - occasionally coupled to drive• Drive Pulley - Coupled to motor pulls
belt - usually special grip surface
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Pulleys
• %nub Pulley - usually used to change
direction of belt and increase thecontact angle with the drive pully 1more
surface area to transfer power3
• 'a&e 8p Pulley - 8sed to maintaintension on a belt left loose enough for
some fle(ibility
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Pulleys
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Drive Pulley Considerations
•Pulley should be large enough to avoid tohard bend at point of tension application
• Pulley should have grab - ris& of slippage
is function of grab and tension - more grab
- less tension - could mean a cheaper belt
• Place Drive in practical location to
minimi5e the highest tension in the belt - a
head pulley location often good on a beltup a slope
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!oading a Conveyor Belt • 6eed to get even load on belt and get
material traveling in same direction tominimi5e belt strain
• Chute - may use scalping bars so fines
fall on first and provide cushion
• 'ransfer Conveyor - wear on short
replaceable belt get things up to speed
• 4ibratory feeder
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Methods of Loading a Belt
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Methods of Loading a Belt
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!oading a Conveyor Belt • %&irt board along edge for about = to >;
feet to &eep material on belt and line it up• Loading points or transfer points are
common spill locations
0 Production rate is not really constant
0 %imulation programs can aid in determining
speed and belt si5e for networ&.
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"nloading a Belt
• +ver the end of belt
0 !latten to fast and stretch the belt 0 !latten to slow material will spread and
spill over sides
0 for 9 degree trough need about >. times
belt width to flatten
• +ften have brushes to belt after
material discharge
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Methods of Cleaning Belt After
ischarge
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"nloading a Belt • Plow - 4 on belt pushes off to sides.
0 Limited speed about :;; fpm 0 6eed flat belt
• 'ripper - moving plow to one side
0 can trip from one conveyor to another 0 good for loading multiple silos
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Plow for ischarging Material
from Belt
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!ri""er for Belt ischarge