1. Topics in Processing Materials Handling Dr. C. L. Jones
Biosystems and Ag. Engineering

2. Materials Handling Assignment: Read Chapter 8 handout Dr. C. L. Jones
Biosystems and Ag. Engineering

3. Materials Handling
All manufacturing facilities, elevators, feed/food processing centers, retail stores, warehouses, …have handling devices
Classification
Belt conveyors
Chain conveyors
Screw conveyors
Bucket conveyors
Oscillating conveyors
Pneumatic conveyors
Gravity conveyors
Cranes
Lift and carrying trucks and carts
Dr. C. L. Jones
Biosystems and Ag. Engineering

4. Materials Handling Belt conveyors
Endless belt between two or more pulleys
High mechanical efficiency
Antifriction bearings
Little material damage
High capacity
Long service life
Low cost
Dr. C. L. Jones
Biosystems and Ag. Engineering

5. Materials Handling Belt conveyors Belt – carries the load Drive
At the discharge end
Usually a belt drive
Tension or take-up
Takes up the stretch in the belt due to contraction/expansion
Dr. C. L. Jones
Biosystems and Ag. Engineering

6. Materials Handling Belt conveyors Idlers Loading device
See Fig. 8.1
Loading device
Hand fed
Mechanically fed
Continuous or intermittent flow
Discharge device
Over the end of the belt
Diagonal scraper
Tilting
Tripper….Fig. 8.2
Dr. C. L. Jones
Biosystems and Ag. Engineering

7. Materials Handling Belt conveyors (Fig. 8.3 and Table 8.1)
Surcharge angle and belt selection (ex. pg 204)
HP to drive empty conveyor (eqtn. 8.1, 8.2, 8.3)(ex. pg 205)
Dr. C. L. Jones
Biosystems and Ag. Engineering

8. Materials Handling Chain conveyors Cheaper than belt conveyors Noisy
Slow
Not efficient
Versatile
Good for intermittent operation
Dr. C. L. Jones
Biosystems and Ag. Engineering

9. Materials Handling Chain conveyors Trolley Scraper Apron
Overhead track
Can make sharp turns, steep inclines
Scraper
Used for granular products
Can make steep inclines
Power requirements and wear are high
Fig. 8.6
Apron
Like scraper with flat slats, steel plates or boards.
Used for conveying sacked materials and large unit sizes
Dr. C. L. Jones
Biosystems and Ag. Engineering

10. Materials Handling Screw conveyors Horizontal Inclined
Used to handle fine materials…powders, granular materials, sticky viscous materials
Simple
Inexpensive
High power requirements
Limited in length
Inclines up to 20 degrees
Horizontal
Inclined
Less efficient mechanically and volumetrically
aka augers
Dr. C. L. Jones
Biosystems and Ag. Engineering

11. Materials Handling Bucket Conveyors
Classified as either belt or chain or both
Range from simple to large, expensive
Fig. 8.8
Centrifugal discharge: small grain
Perfect-discharge: slow speed, cheap, handles delicate material well
Continuous bucket: heavy duty use, ores, sand…discharges by sliding over bottom of preceding bucket
Two variations of buckets: Fig. 8.10
Equation 8.11 for HP
Dr. C. L. Jones
Biosystems and Ag. Engineering

12. Materials Handling Wednesday Meet in Ag Hall 3:30 to 4:20
More conveyors
Dr. C. L. Jones
Biosystems and Ag. Engineering