Operating Green Can Make you Green By Screening Efficiently
•The screen must be installed correctly
•The screen must be fed and operated correctly
•The Screen must have the appropriate media for the application
•The Screen must be properly maintained
Vibrating Screen Types
The Vibrating Incline Screen
• The vibrating Incline screen is the most common unit used in stationary crushed stone plants.
• A single shaft two bearing mechanism is widely used to produce a circular motion with gravity being relied upon to effect the rate of travel (can have more shafts and bearings).
• Inclination can vary from 15° to 25° (20° typical).
• Typical shaft speed is in the range of 650 1100 RPM with 5/8″ 1/ 8″ stroke.
• GForce in the range of 3.5 to 4.5 G’s.
• High travel rate (100 to 125 FPM).
The Circular Motion
• Typical shaft speed is in the range of 650 1100 RPM with 5/8″ 1/ 8″ stroke.
• GForce in the range of 3.5 to 4.5 G’s.
• Inclination can vary from 15° to 25°.
• High travel rate (100 to 125 FPM).
• Moderate to good screening efficiency.
Factors Which Effect Screening
• Tons per hour per square foot
• Oversize factor
• Half size factor
• Bulk Density
• Aperture shape
• Particle shape
• Screen open area
• Surface moisture
• Screen feed arrangement
Stroke & Speed
The stroke size effects how the feed material starts to stratify. It also effects pegging, blinding and screen capacity. Screen speed and acceleration effects the screen performance. Acceleration of the screen box can be calculated with the stroke and speed. Acceleration effects screen body stress and screen capacity.
Standard Square Wire Cloth
• Inexpensive high open area helps to pass more undersize.
• Most accurate of any opening style.
• Used when a cubical product is required.
• Available in openings from 10 Mesh to 6″.
• Wire diameters up to 1″
• Wire cloth with square openings is the most common media inventoried.
• Economical for frequent product changes.
• Easy to install.
• Can be supplied in stainless steel to help reduce blinding, pegging and is also resistant to corrosive material
Bearing Life of screening equpment
• Decreases as speed increases
• Decreases as throw increases
• Speed changes affect bearing life more than throw changes
• Decreases as counterweight increases
• Theoretical bearing life is a method of comparing one bearing application to another by taking into account bearing design, loading and mounting characteristics.
The Vibrating Horizontal Screen
• The vibrating horizontal screen is commonly used on portable plants or where head room is an issue.
• The motion of the horizontal screen can be straight line (linear) or elliptical.
• Normally mounted horizontal but some models could be inclined as much as 10°.
• Typical shaft speed is in the range of 600 1100 RPM with 7/8″ 3/ 8″ stroke.
• GForce in the range of 4.5 to 5.5 G’s on two shaft mechanisms or 4.5 to 7.0 G’s on three shaft mechanisms.
• Low travel rate (40 to 60 FPM).
The Vibrating TS (High Performance)Screen
• The multislope vibrating screen is used in the same application as the incline screen but performs at a much higher capacity and efficiency.
• The multislope screen combines the high capacity of an incline screen and the high efficiency of a horizontal screen.
• The screen has various slope angles for the different screen sections resulting in High Performance.
• GForce in the range of 4.5 to 6 G’s.
• High travel rate at the feed end of the screen.
• Low travel rate at the discharge end of the screen.
• As high as a +40% increase in capacity vs. a similar sized incline screen.
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Operating Green and Efficient with Vibrating Screens
Operating Green Can Make you Green By Screening Efficiently
•The screen must be installed correctly
•The screen must be fed and operated correctly
•The Screen must have the appropriate media for the application
•The Screen must be properly maintained
Vibrating Screen Types
The Vibrating Incline Screen
• The vibrating Incline screen is the most common unit used in stationary crushed stone plants.
• A single shaft two bearing mechanism is widely used to produce a circular motion with gravity being relied upon to effect the rate of travel (can have more shafts and bearings).
• Inclination can vary from 15° to 25° (20° typical).
• Typical shaft speed is in the range of 650 1100 RPM with 5/8″ 1/ 8″ stroke.
• GForce in the range of 3.5 to 4.5 G’s.
• High travel rate (100 to 125 FPM).
The Circular Motion
• Typical shaft speed is in the range of 650 1100 RPM with 5/8″ 1/ 8″ stroke.
• GForce in the range of 3.5 to 4.5 G’s.
• Inclination can vary from 15° to 25°.
• High travel rate (100 to 125 FPM).
• Moderate to good screening efficiency.
Factors Which Effect Screening
• Tons per hour per square foot
• Oversize factor
• Half size factor
• Bulk Density
• Aperture shape
• Particle shape
• Screen open area
• Surface moisture
• Screen feed arrangement
Stroke & Speed
The stroke size effects how the feed material starts to stratify. It also effects pegging, blinding and screen capacity. Screen speed and acceleration effects the screen performance. Acceleration of the screen box can be calculated with the stroke and speed. Acceleration effects screen body stress and screen capacity.
Standard Square Wire Cloth
• Inexpensive high open area helps to pass more undersize.
• Most accurate of any opening style.
• Used when a cubical product is required.
• Available in openings from 10 Mesh to 6″.
• Wire diameters up to 1″
• Wire cloth with square openings is the most common media inventoried.
• Economical for frequent product changes.
• Easy to install.
• Can be supplied in stainless steel to help reduce blinding, pegging and is also resistant to corrosive material
Bearing Life of screening equpment
• Decreases as speed increases
• Decreases as throw increases
• Speed changes affect bearing life more than throw changes
• Decreases as counterweight increases
• Theoretical bearing life is a method of comparing one bearing application to another by taking into account bearing design, loading and mounting characteristics.
The Vibrating Horizontal Screen
• The vibrating horizontal screen is commonly used on portable plants or where head room is an issue.
• The motion of the horizontal screen can be straight line (linear) or elliptical.
• Normally mounted horizontal but some models could be inclined as much as 10°.
• Typical shaft speed is in the range of 600 1100 RPM with 7/8″ 3/ 8″ stroke.
• GForce in the range of 4.5 to 5.5 G’s on two shaft mechanisms or 4.5 to 7.0 G’s on three shaft mechanisms.
• Low travel rate (40 to 60 FPM).
The Vibrating TS (High Performance)Screen
• The multislope vibrating screen is used in the same application as the incline screen but performs at a much higher capacity and efficiency.
• The multislope screen combines the high capacity of an incline screen and the high efficiency of a horizontal screen.
• The screen has various slope angles for the different screen sections resulting in High Performance.
• GForce in the range of 4.5 to 6 G’s.
• High travel rate at the feed end of the screen.
• Low travel rate at the discharge end of the screen.
• As high as a +40% increase in capacity vs. a similar sized incline screen.