oval stroke screen features and benefits 2009
TRANSCRIPT
![Page 1: Oval Stroke Screen Features and Benefits 2009](https://reader038.vdocuments.us/reader038/viewer/2022102802/577cc9eb1a28aba711a4f205/html5/thumbnails/1.jpg)
Cedarapids Triple Shaft Screen Features & Benefits2009
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Cedarapids/ElJay Triple Shaft Screen
“The Originator and The Innovator”
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General Screening Considerations
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Generally speaking, the crusher breaks the material, but the screen sorts the material to make the specification.
Gradation versus Specification
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Backbone of the Crushing Circuit:Backbone of the Crushing Circuit:
In the majority of crushing circuits, screening is usually the bottleneck not the crushing.
Proper screening is so important to the circuit, it is essential to cover the topic when discussing crushers.
Screening Theory
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Never Cut Corners on ScreeningNever Cut Corners on Screening
The vibrating screen is the “cash register” in any operation. This is not a unit machine in the circuit that can afford to be undersized. Determination of the critical deck must be accomplished with consideration given to future markets. Custom blending and tighter aggregate specifications may require detailed review of product chute design. This type of design may affect the types and heights of structures.
Screening Theory
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Don’t Limit your future:Don’t Limit your future:Make your crushers the bottleneck of your plant!!
Screening Theory
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PRIMARY FACTORS:PRIMARY FACTORS: STRATIFICATIONSTRATIFICATION
The process of large size particles rising The process of large size particles rising to the top of the vibrating material bed to the top of the vibrating material bed while the smaller size particles fall while the smaller size particles fall through the voids to find their way to through the voids to find their way to the screen surface openingthe screen surface opening
SEPARATIONSEPARATION The process of particles presenting themselves to The process of particles presenting themselves to
the screen surface openings passing through the the screen surface openings passing through the opening if smaller and being rejected if larger than opening if smaller and being rejected if larger than the opening.the opening.
Screening Theory
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Stratification must occur before Stratification must occur before Separation can occur!!Separation can occur!!
Screening Theory
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Stratification and Separation
Feed Material
Overs – (Product)
Material that passes over
screening surface
Throughs – (Product)
Material that passes though
screening surface
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Stratification and Separation
Typical Distribution of Typical Distribution of
Material Through Screen Material Through Screen
DeckDeck
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Vibrating Screens Used In The Aggregate Industry
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Two Styles of Screens in the Aggregate Industry
1. Inclined/Sloped Screens• Low stroke, low G-force• Gravity propels material down the screen
2. Horizontal Screens• Large stroke, high G-force• Screen movement propels material down the
screen
Screen Styles
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Horizontal Screen Advantage
EFFECTIVE LENGTH OF SCREEN
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Three Types of Screen Motion
1. Circle Throw
2. Straight Line (Reciprocating)
3. Oval Stroke (Elliptical)
Screen Motion
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Three Types of Screen Motion
1. Circle Throw• Usually associated with inclined• Low energy, needs gravity to move material
down screen• Resistant to Plugging and Pegging• Blinding is a problem with low stroke• Single or Dual shaft eccentric
2. Straight Line (Reciprocating)
3. Oval Stroke (Elliptical)
Screen Motion
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Typical Inclined Screen Circular Motion
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Typical Inclined Screen
Screen Wire
Screen WireOpening
20°
Effective Opening
Small Circular Stroke0.31” (8mm)
Low Energy 3-4 Gs
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Typical Inclined Screen
Typical Inclined Screen
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Three Types of Screen Motion
1. Circle Throw
2. Straight Line (Reciprocating)• Usually horizontal• More efficient and accurate• Plugging can be a problem• 30 to 45 degree “fixed” angle• Dual counter rotating shafts
1. Oval Stroke
Screen Motion
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Horizontal Screen Straight Motion
2 Shaft Thrust
2 Shaft Thrust Two Weighted Counter Rotating ShaftsNo Thrust
No Thrust
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Horizontal Screen Straight Motion
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Typical Horizontal Screen
Screen Wire
Opening
Horizontal Screen Straight Motion
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Typical Horizontal Screen
Horizontal Screen Straight Motion
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A Third Kind of Screen Action
Oval Stroke (Elliptical)• Combines the plug resistant exacting
screening of the circle throw with the efficiency and conveying action of straight line motion
Screen Motion
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Three Types of Screen Motion
1. Circle Throw
2. Straight Line (Reciprocating)
3. Oval Stroke (Elliptical)• Horizontal mounting• Highest efficiency & accuracy• High energy to loosen fines• High resistance to Pegging• High resistance to Blinding• Adjustable Three Shaft Vibrator
Screen Motion
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Cedarapids Triple Shaft Screen Elliptical Motion
3 Shaft Thrust
3 Shaft Thrust
1 Shaft Thrust
1 Shaft Thrust
Three Weighted Counter Rotating Shafts
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Cedarapids Triple Shaft Screen Elliptical Motion
3
13:1 Ellipse
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The lengthened part of the stroke propels the material
down the length of the screen.
The “Vertical Zone” part of the stroke has little fore/aft
movement to allow efficient passage of material
Cedarapids Elliptical Screen
Screen Opening
VerticalZone
Oval Motion Path
The high “g” action around the ends works the “arrow heads” out, minimizes blinding and provides very efficient sizing accuracy
Cedarapids Triple Shaft Screen Elliptical Motion
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Cedarapids Elliptical Screen
Cedarapids Triple Shaft Screen Elliptical Motion
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Two Myths in the Aggregate Industry
1. Horizontal Screens in Portable Applications, Inclined Screens in Stationary Applications
2. Inclined Screens for Capacity Horizontal Screens for Efficiency
Screening Theory
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Screen Media
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Screen Media
SCREENING PROBLEM
WIRE CLOTH HC, OT & SS
DUR-X- VIBRASPAN or HARP SCREEN
PERF. PLATE
PROFILE WIRE
DUR-X-ACCUSLOT
URETHANE RUBBER #240 SELF-CLEANING RUBBER
WET PLUGGING
FAIR OT
SLOTTED
EXCELLENT OT
(HIGH PROD.)
NR
FAIR
EXCELLENT OT
GOOD
FAIR
EXCELLENT
DRY PLUGGING
FAIR - GOOD OT
SLOTTED
EXCELLENT OT
(HIGH PROD.)
NR
FAIR
EXCELLENT SS
NR
FAIR
EXCELLENT
BLINDING OR STICKING
FAIR - GOOD SS
SLOTTED
EXCELLENT SS
(HIGH PROD.)
NR
NR
EXCELLENT SS
FAIR
NR
GOOD
SHORT WEAR LIFE
NR
NR
GOOD
GOOD
NR
EXCELLENT (WET)
EXCELLENT (DRY)
EXCELLENT
LIMITED CAPACITY
GOOD - EXCELLENT
EXCELLENT
NR
NR
EXCELLENT
NR
NR
FAIR
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Screen Media
0 10 20 30 40 50 60 70
WIRE CLOTH
PROFILE WIRE
PERF. PLATE
RUBBER
URETHANE
Typical Initial Cost Per Square Foot
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Screen Media
0 2 4 6 8 10 12 14 16
WIRE CLOTH
PERF. PLATE
PUNCHED RUBBER
MOLDED RUBBER
URETHANE
Typical Life Expectancy Compared to Wire Cloth
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Cedarapids/ElJay Triple Shaft Horizontal Screen Features
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Adjustable Stroke Angle
45°30°60°
Move material Faster For
Coarse Material
Move material Slower For Fine
Material
Multi Position Key Bolt Allows Changing
of Stroke Angle
Cedarapids Triple Shaft Screen
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Adjustable Stroke Length
Add Plug Weights To Increase Stroke for Coarse Material
Remove Plug Weights To Decrease Stroke for
Fine MaterialThree Removable
Plug Weights
Cedarapids Triple Shaft Screen
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Screen Speed Adjustment
Screen Speed Variation
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Adjustable Stroke And Speed
• Ability to optimize performance• Adjust to varying conditions• Adaptable to most screening
applications
Cedarapids Triple Shaft Screen
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The adjustment allows for exceptional accuracy for tough specifications (such as Superpave)
Angle adjustment along with Speed and Stroke “fine tune” the screening installation to match varying requirements and specifications
Cedarapids Triple Shaft Screen
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Horizontal Screens
Stroke and Speed Guidelines
Dry 100 lb/ft³ Material
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Stroke, Angle, Speed Relationship
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Exclusive Features Built Into The Cedarapids/Eljay Triple Shaft Horizontal Screen
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20 Major Improvements and Innovations
(patented)
Cedarapids/ElJay Screens 20 Reasons
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Cedarapids/ElJay Screen Features
Formed Key bolt Retainer Clip•Eliminates weld operation.•Easier to change timing in the field.
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Improved SpindleEasy inline bearing removal,
eliminates need to remove shaftSlip fit spindle for maximum clamp
forceNew groove geometry for easy
bearing removal
GearsHigh performance gears with
Optimized tooth geometry Reduced tooth contact
stress for maximum gear life
Cedarapids/ElJay Screen Features
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Hub Oil PortsEliminates trapped oil in
bearings which causes bearing hot spots
Strategically positioned to maintain constant lubrication to bearings for Long life
Hub oil ports
Controlled oil “cylinder”
Cedarapids/ElJay Screen Features
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Double O-Ring Sealed Huckbolt
DesignLeak freeSecure & consistentFatigue resistantHigh Strength joints Constructed for maximum
reliability and life
Cedarapids/ElJay Screen Features
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Gear Case BafflesEliminates lubrication breakdown due to high temperature
from agitation
Maintains lubricant viscosity to protect bearings
Results: Longer Bearing And Gear Life
Cedarapids/ElJay Screen Features
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Thicker Clamp Bars56% Stronger – from 1/4” to
5/16” for longer wire life and maintains uniform wire cloth tension
Increased Deck Clearance TSH 6’ x 20’ and 7’ x 20’, adds
2” between top and center deck for ease of cloth change-out and increased clearance for material and spray bars
Cedarapids/ElJay Screen Features
Optimized Deck Crown
6’, 7’, 8’ models, creates uniform wire support which reduces wire cloth fatigue
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High quality, high strength steel 40% Stronger than standard steel Greater resistance to wear, stress and fatigue.
Cedarapids/ElJay Screen Features
High Strength Side plates
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Clamp Bar Strips Additional side sheet
protection to prevent damage from clamp bar hardware.
Hand Access HolesProvides quick access for
screen cloth changesAllows visual inspection
of deck.
Cedarapids/ElJay Screen Features
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Ductile Spherical WashersSofter ductile material reduces
wear on sidesheetsControlled cast shape, seats
uniformly to maintain wire tension
Dual Snubbers Smooth start-up and shut-
down
Cedarapids/ElJay Screen Features
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HD Style Belts5 times life over
conventional belts
Cedarapids/ElJay Screen Features
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Gland Shaft Seal
Long life, non-contact rotary seal, outperforms, out-lasts lip contact seals due to no wear surfaces
Cedarapids/ElJay Screen Features
Shaft Seal Assembly
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End Tension Deck
Fully bolted braced design for maximum rigidity
Optimized profile provides uniform wire cloth support
Cedarapids/ElJay Screen Features
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Herringbone Bracing
Fully braced entire lengthEliminates residual weld
stress Increased strength to allow
heavier deck loadsAllows installation of heavier
modular media
Cedarapids/ElJay Screen Features
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Cedarapids/ElJay Screen Features
Stronger cross beams for 6’, 7’, and 8’• 100% welded instead of staggered skip welds eliminate
stress risers from weld terminations• 20% Stronger cross beam flanges on 7’ and 8’ screens• Thicker webs provide 56% stronger connection to bracing
Old Design Current Beam
20% wider
Thicker Web 100% Welded
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Cedarapids/ElJay Screen Features
Concentric Joint construction• Eliminates side wall flex
Full Length Bracing• stabilizes flexible screen media
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Cedarapids/ElJay Screen Features
Coil Spring Design•Higher rate spring now used on 6x20 and 5x16 screen (highest load per spring)• Improves productivity and handles heavier loads without hitting bottom•New dual tempering process dramatically increases toughness and resistance to fracture.
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Cedarapids/ElJay Screen Features
Medium Scalping Top DeckThick I-Beam Construction•82% stronger cross Beams•Thick flange extends wear life•Higher energy absorption1/2” crown bars replace 3/8”•68% more support strength•50% wider crown rubber support
Fits standard heavy duty screens•Low profile design allows 2nd deck access
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Cedarapids/ElJay Screen Features
Medium Scalping Side Liners/ExtensionsAbrasion Resistant Side liners
• Protects main side plates• Extends 6” above to contain larger
material• Extends around Feed Box
Fits Heavy Duty Triple Shaft Screens
• Easy top flange attachment• 1/4” Hi Strength side plates 11%
stronger than 5/16” mild steel.• Reduces machine weight for more
screen action• Minimal cost to upgrade new or
existing units.
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Modular Media
(THICK) MODULAR PANELS
UNIQUE GIRDERS
PIN/SLEEVE
NIPPLE/PIN
SNAP-IN
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Cedarapids Modular Media Solution
Required to Approve Application
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Hooded Breather
Prevent water ingestion in wet screen applications
Cedarapids/ElJay Screen Features
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Cedarapids/ElJay Screen Features
Why Choose Cedarapids/ElJay Screens?Why Choose Cedarapids/ElJay Screens?
• Higher AccuracyHigher Accuracy• Greater DurabilityGreater Durability• Increased VersatilityIncreased Versatility• Increased CapacityIncreased Capacity• Total Customer SupportTotal Customer Support
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Cedarapids/ElJay Screen Features
Why Choose Cedarapids/ElJay Screens?Why Choose Cedarapids/ElJay Screens?• Higher AccuracyHigher Accuracy•Oval stroke screen action provides very efficient sizing accuracy. The incremental 5° angle adjustment along with speed and stroke adjustments are able to “fine tune” the screening installation to match your requirements and specifications.
• Greater Durability• Increased Versatility• Increased Capacity• Total Customer Support
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Cedarapids/ElJay Screen Features
Why Choose Cedarapids/ElJay Screens?Why Choose Cedarapids/ElJay Screens?• Higher Accuracy• Greater DurabilityGreater Durability•Thicker clamp bars, high strength steel sideplates, non-leaking shaft seal, and patented gear case baffles and O-Ring Huckbolt construction are just a few of the innovations designed to reduce wear and increase equipment life.
• Increased Versatility• Increased Capacity• Total Customer Support
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Cedarapids/ElJay Screen Features
Why Choose Cedarapids/ElJay Screens?Why Choose Cedarapids/ElJay Screens?• Higher Accuracy• Greater Durability• Increased VersatilityIncreased Versatility•Screens crushed stone, sand and gravel, and moist feed efficiently and with maximum continuous flow rate.
• Increased Capacity• Total Customer Support
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Cedarapids/ElJay Screen Features
Why Choose Cedarapids/ElJay Screens?Why Choose Cedarapids/ElJay Screens?• Higher Accuracy• Greater Durability• Increased Versatility• Increased CapacityIncreased Capacity•High G force operation provides ability to stratify and separate large quantities of materials. In many cases the TSH 6 x 20 screen will outperform an 8 x 24 incline screen.
• Total Customer Support
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Cedarapids/ElJay Screen Features
Why Choose Cedarapids/ElJay Screens?Why Choose Cedarapids/ElJay Screens?• Higher Accuracy• Greater Durability• Increased Versatility• Increased Capacity• Total Customer SupportTotal Customer Support•The Terex team consisting of the superior Dealer Network along with the factory aftermarket team is available to help with your application, service, and spare parts needs.
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Horizontal Screen Stationary Installation
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Horizontal Screen Portable Installation
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THANK YOU