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

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

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

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

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

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

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

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