Dr. C. L. Jones Biosystems and Ag. Engineering

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