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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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slide1

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

slide2

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

slide3

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

slide4

Lecture 20 – Materials Handling(Chpt 8 Henderson/Perry)

  • Oscillating conveyors (page 223)

Dr. C. L. Jones

Biosystems and Ag. Engineering

slide5

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

slide6

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

slide7

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

slide8

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