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

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

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

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

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

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

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

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

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

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

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

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

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

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