1. Lecture 19 – Materials Handling (Chpt 8 Henderson/Perry)
Types of conveyors:
Belt Conveyors
Chain Conveyors
Screw Conveyors
Bucket Elevators
Oscillating Conveyors
Gravity Conveyors
Cranes
Lift and Carrying Trucks and Carts
Dr. C. L. Jones
Biosystems and Ag. Engineering

2. Lecture 19 – Materials Handling (Chpt 8 Henderson/Perry)
Belt conveyors: Page 200
High mechanical efficiency
Low damage to product being handled
Long distances an option
Limited by angle of elevation
Long service life
High initial investment cost
Dr. C. L. Jones
Biosystems and Ag. Engineering

3. Lecture 19 – Materials Handling (Chpt 8 Henderson/Perry)
Belt conveyors:
Consist of endless belt operating between 2 pulleys
Dr. C. L. Jones
Biosystems and Ag. Engineering

4. Lecture 19 – Materials Handling (Chpt 8 Henderson/Perry)
Belt conveyors:
Consist of endless belt operating between 2 pulleys
Dr. C. L. Jones
Biosystems and Ag. Engineering

5. Lecture 19 – Materials Handling (Chpt 8 Henderson/Perry)
Belt conveyors: Design (preliminary and basic)
Width determined by amount of material conveyed, quantity, and type of service.
Cross section: Fig. 8.3
Surcharge = portion of load above the horizontal line
Surcharge angle large for lumped material. 20 degrees for most materials
Example pg 204 and 205
Dr. C. L. Jones
Biosystems and Ag. Engineering

6. Lecture 19 – Materials Handling (Chpt 8 Henderson/Perry)
Chain conveyors: Page 206
Not as expensive
Noisy
Slow
Inefficient
Design versatility
Suited for many different kinds of jobs
3 kinds: trolley, scraper, and apron
Dr. C. L. Jones
Biosystems and Ag. Engineering

7. Lecture 19 – Materials Handling (Chpt 8 Henderson/Perry)
Chain conveyors:
Trolley: Fig. 8.4
Can make sharp turns up to 180 degrees
Steep inclines
Good for immersing into baths (fryers, paint coating, cooking)
Dr. C. L. Jones
Biosystems and Ag. Engineering

8. Lecture 19 – Materials Handling (Chpt 8 Henderson/Perry)
Chain conveyors:
Scraper
Flight cross-sections Fig. 8.6 page 209
Good for granular, nonabrasive materials
Simple
Cheap
Steep inclines
Raw products
Portable
Chain driven
Dr. C. L. Jones
Biosystems and Ag. Engineering

9. Lecture 19 – Materials Handling (Chpt 8 Henderson/Perry)
Chain conveyors:
Apron
Flights are replaced by flat slats, plates or boards
Used for sacked materials and large units
Dr. C. L. Jones
Biosystems and Ag. Engineering

10. Lecture 19 – Materials Handling (Chpt 8 Henderson/Perry)
Chain conveyor design: Page 210
Theoretical Power Equation 8.4
Incline versus capacity Page 211
Friction Coefficients Page 211 Table 8.2
Example page 212
Dr. C. L. Jones
Biosystems and Ag. Engineering

11. Lecture 19 – Materials Handling (Chpt 8 Henderson/Perry)
Screw Conveyors: Page 213
Fine powders, heavy viscous materials, chemically active hot substances, granular materials
Simple
No cracks, crevices, sharp recesses
Can be dust tight
Good for food products: powdered milk, p-butter
Used as feeder for batch and continuous mixing
Inexpensive but high power requirements
Length of sections is limited
Dr. C. L. Jones
Biosystems and Ag. Engineering

12. Lecture 19 – Materials Handling (Chpt 8 Henderson/Perry)
Screw Conveyors:
Standard pitch = diameter
Inclines up to 20 degrees
Dr. C. L. Jones
Biosystems and Ag. Engineering

13. Lecture 19 – Materials Handling (Chpt 8 Henderson/Perry)
Screw Conveyors: Page 213
Capacity calculation: pg. 214 eqtn. 8.5
Table 8.3 and 8.4 capacity data and material classification
Equation 8.6 for HP
Dr. C. L. Jones
Biosystems and Ag. Engineering

14. Lecture 19 – Materials Handling (Chpt 8 Henderson/Perry)
Next Lecture will cover:
Bucket elevators
Oscillating conveyors
Pneumatic conveyors
Gravity conveyors
Cranes, trucks and carts
Work conveyor problems
Dr. C. L. Jones
Biosystems and Ag. Engineering