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

Lecture 20 – 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 .

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

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  1. Lecture 20 – 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

  2. Lecture 20 – Materials Handling(Chpt 8 Henderson/Perry) • Bucket elevators • Figure 8.8 page 219 • Centrifugal discharge for small grain • Perfect discharge: low cost, slow moving, low damage required • Continuous-bucket type: heavy duty use such as ores, sand, rocks. Material slides over preceding bucket bottom • Read section in handout. Dr. C. L. Jones Biosystems and Ag. Engineering

  3. Lecture 20 – Materials Handling(Chpt 8 Henderson/Perry) • Bucket elevators A bucket elevator has 36 buckets similar to the configuration in Fig. 8.10(a) and a lift of 73 ft. Calculate the HP. Dr. C. L. Jones Biosystems and Ag. Engineering

  4. Lecture 20 – Materials Handling(Chpt 8 Henderson/Perry) • Oscillating conveyors (page 223) Dr. C. L. Jones Biosystems and Ag. Engineering

  5. Lecture 20 – Materials Handling(Chpt 8 Henderson/Perry) • Pneumatic conveyors (page 224) • Figure 8.14 • Uses fans, vacuums, and conduits • We will work a problem on Friday for this kind of conveyor Dr. C. L. Jones Biosystems and Ag. Engineering

  6. Lecture 20 – Materials Handling(Chpt 8 Henderson/Perry) • Gravity conveyors • Consist of rollers or wheels set on a level or a slight incline. • Material is moved by hand or by gravity. • Intermittent service • Used as a support aide with external power. Dr. C. L. Jones Biosystems and Ag. Engineering

  7. Lecture 20 – Materials Handling(Chpt 8 Henderson/Perry) • Cranes, trucks and carts • Cranes are not used extensively in ag services but are used largely for construction • Trucks, fork lifts and carts: • Used in warehouses and shipping units • Generally handle large bulky items • Can handle variable location items • Must consider labor efficiency and time/motion studies • Included would be bale spikes and some bale loaders Dr. C. L. Jones Biosystems and Ag. Engineering

  8. Lecture 20 – Materials Handling(Chpt 8 Henderson/Perry) Example: A bucket elevator has buckets similar to the configuration in Fig. 8.10(b). The belt speed is 35 ft/min and there are 52 buckets on the belt. The lift is 92 ft. Calculate the HP. Dr. C. L. Jones Biosystems and Ag. Engineering

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