Slide 1Slide 2Slide 3Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12Slide 13Slide 14Dr. C. L. JonesBiosystems and Ag. Engineering•Types of conveyors:–Belt Conveyors–Chain Conveyors–Screw Conveyors–Bucket Elevators–Oscillating Conveyors–Gravity Conveyors–Cranes–Lift and Carrying Trucks and CartsLecture 19 – Materials Handling(Chpt 8 Henderson/Perry)Dr. C. L. JonesBiosystems and Ag. Engineering•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 costLecture 19 – Materials Handling(Chpt 8 Henderson/Perry)Dr. C. L. JonesBiosystems and Ag. Engineering•Belt conveyors:–Consist of endless belt operating between 2 pulleysLecture 19 – Materials Handling(Chpt 8 Henderson/Perry)Dr. C. L. JonesBiosystems and Ag. Engineering•Belt conveyors:–Consist of endless belt operating between 2 pulleysLecture 19 – Materials Handling(Chpt 8 Henderson/Perry)Dr. C. L. JonesBiosystems and Ag. Engineering•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 Lecture 19 – Materials Handling(Chpt 8 Henderson/Perry)Dr. C. L. JonesBiosystems and Ag. Engineering•Chain conveyors: Page 206–Not as expensive–Noisy–Slow–Inefficient–Design versatility–Suited for many different kinds of jobs–3 kinds: trolley, scraper, and apronLecture 19 – Materials Handling(Chpt 8 Henderson/Perry)Dr. C. L. JonesBiosystems and Ag. Engineering•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)Lecture 19 – Materials Handling(Chpt 8 Henderson/Perry)Dr. C. L. JonesBiosystems and Ag. Engineering•Chain conveyors:–Scraper–Flight cross-sections Fig. 8.6 page 209–Good for granular, nonabrasive materials–Simple–Cheap–Steep inclines–Raw products–Portable–Chain drivenLecture 19 – Materials Handling(Chpt 8 Henderson/Perry)Dr. C. L. JonesBiosystems and Ag. Engineering•Chain conveyors:–Apron–Flights are replaced by flat slats, plates or boards–Used for sacked materials and large unitsLecture 19 – Materials Handling(Chpt 8 Henderson/Perry)Dr. C. L. JonesBiosystems and Ag. Engineering•Chain conveyor design: Page 210•Theoretical Power Equation 8.4•Incline versus capacity Page 211•Friction Coefficients Page 211 Table 8.2•Example page 212Lecture 19 – Materials Handling(Chpt 8 Henderson/Perry)Dr. C. L. JonesBiosystems and Ag. Engineering•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 limitedLecture 19 – Materials Handling(Chpt 8 Henderson/Perry)Dr. C. L. JonesBiosystems and Ag. Engineering•Screw Conveyors: –Standard pitch = diameter–Inclines up to 20 degreesLecture 19 – Materials Handling(Chpt 8 Henderson/Perry)Dr. C. L. JonesBiosystems and Ag. Engineering•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 HPLecture 19 – Materials Handling(Chpt 8 Henderson/Perry)Dr. C. L. JonesBiosystems and Ag. Engineering•Next Lecture will cover:–Bucket elevators–Oscillating conveyors–Pneumatic conveyors–Gravity conveyors–Cranes, trucks and carts–Work conveyor problemsLecture 19 – Materials Handling(Chpt 8
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