oval stroke screen features and benefits 2009

Cedarapids Triple Shaft Screen Features & Benefits2009

Cedarapids/ElJay Triple Shaft Screen

“The Originator and The Innovator”

General Screening Considerations

Generally speaking, the crusher breaks the material, but the screen sorts the material to make the specification.

Gradation versus Specification

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

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

Don’t Limit your future:Don’t Limit your future:Make your crushers the bottleneck of your plant!!

Screening Theory

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

Stratification must occur before Stratification must occur before Separation can occur!!Separation can occur!!

Screening Theory

Stratification and Separation

Feed Material

Overs – (Product)

Material that passes over

screening surface

Throughs – (Product)

Material that passes though

screening surface

Stratification and Separation

Typical Distribution of Typical Distribution of

Material Through Screen Material Through Screen

DeckDeck

Vibrating Screens Used In The Aggregate Industry

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

Horizontal Screen Advantage

EFFECTIVE LENGTH OF SCREEN

Three Types of Screen Motion

1. Circle Throw

2. Straight Line (Reciprocating)

3. Oval Stroke (Elliptical)

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


3. Oval Stroke (Elliptical)

Screen Motion

Typical Inclined Screen Circular Motion

Typical Inclined Screen

Screen Wire

Screen WireOpening

20°

Effective Opening

Small Circular Stroke0.31” (8mm)

Low Energy 3-4 Gs


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

Horizontal Screen Straight Motion

2 Shaft Thrust

2 Shaft Thrust Two Weighted Counter Rotating ShaftsNo Thrust

No Thrust

Typical Horizontal Screen

Screen Wire

Opening


Typical Horizontal Screen


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


1. Circle Throw


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

Cedarapids Triple Shaft Screen Elliptical Motion

3 Shaft Thrust

3 Shaft Thrust

1 Shaft Thrust

1 Shaft Thrust

Three Weighted Counter Rotating Shafts


3

13:1 Ellipse

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 Elliptical Screen


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

Screen Media

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

Screen Media

0 10 20 30 40 50 60 70

WIRE CLOTH

PROFILE WIRE

PERF. PLATE

RUBBER

URETHANE

Typical Initial Cost Per Square Foot

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

Cedarapids/ElJay Triple Shaft Horizontal Screen Features

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

Adjustable Stroke Length

Add Plug Weights To Increase Stroke for Coarse Material

Remove Plug Weights To Decrease Stroke for

Fine MaterialThree Removable

Plug Weights


Screen Speed Adjustment

Screen Speed Variation

Adjustable Stroke And Speed

• Ability to optimize performance• Adjust to varying conditions• Adaptable to most screening

applications


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


Horizontal Screens

Stroke and Speed Guidelines

Dry 100 lb/ft³ Material

Stroke, Angle, Speed Relationship

Exclusive Features Built Into The Cedarapids/Eljay Triple Shaft Horizontal Screen

20 Major Improvements and Innovations

(patented)

Cedarapids/ElJay Screens 20 Reasons

Cedarapids/ElJay Screen Features

Formed Key bolt Retainer Clip•Eliminates weld operation.•Easier to change timing in the field.

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


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”


Double O-Ring Sealed Huckbolt

DesignLeak freeSecure & consistentFatigue resistantHigh Strength joints Constructed for maximum

reliability and life


Gear Case BafflesEliminates lubrication breakdown due to high temperature

from agitation

Maintains lubricant viscosity to protect bearings

Results: Longer Bearing And Gear Life


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


Optimized Deck Crown

6’, 7’, 8’ models, creates uniform wire support which reduces wire cloth fatigue

High quality, high strength steel 40% Stronger than standard steel Greater resistance to wear, stress and fatigue.


High Strength Side plates

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.


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


HD Style Belts5 times life over

conventional belts


Gland Shaft Seal

Long life, non-contact rotary seal, outperforms, out-lasts lip contact seals due to no wear surfaces


Shaft Seal Assembly

End Tension Deck

Fully bolted braced design for maximum rigidity

Optimized profile provides uniform wire cloth support


Herringbone Bracing

Fully braced entire lengthEliminates residual weld

stress Increased strength to allow

heavier deck loadsAllows installation of heavier

modular media



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


Concentric Joint construction• Eliminates side wall flex

Full Length Bracing• stabilizes flexible screen media


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.


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


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.

Modular Media

(THICK) MODULAR PANELS

UNIQUE GIRDERS

PIN/SLEEVE

NIPPLE/PIN

SNAP-IN

Cedarapids Modular Media Solution

Required to Approve Application

Hooded Breather

Prevent water ingestion in wet screen applications



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


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


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


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


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


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.

Horizontal Screen Stationary Installation

Horizontal Screen Portable Installation

THANK YOU

oval stroke screen features and benefits 2009

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