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)
Homework from Chapter 8 handout
Probem 2 Part 1
Problem 5 Part A – C
Problem 6
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