Dr. C. L. Jones

1
Lecture 19 Materials Handling(Chpt 8
Henderson/Perry)

• Types of conveyors
• Belt Conveyors
• Chain Conveyors
• Screw Conveyors
• Bucket Elevators
• Oscillating Conveyors
• Gravity Conveyors
• Cranes
• Lift and Carrying Trucks and Carts

Dr. C. L. Jones Biosystems and Ag. Engineering
2
Lecture 19 Materials Handling(Chpt 8
Henderson/Perry)

• 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 cost

Dr. C. L. Jones Biosystems and Ag. Engineering
3
Lecture 19 Materials Handling(Chpt 8
Henderson/Perry)

• Belt conveyors
• Consist of endless belt operating between 2
  pulleys

Dr. C. L. Jones Biosystems and Ag. Engineering
4
Lecture 19 Materials Handling(Chpt 8
Henderson/Perry)

• Belt conveyors
• Consist of endless belt operating between 2
  pulleys

Dr. C. L. Jones Biosystems and Ag. Engineering
5
Lecture 19 Materials Handling(Chpt 8
Henderson/Perry)

• 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

Dr. C. L. Jones Biosystems and Ag. Engineering
6
Lecture 19 Materials Handling(Chpt 8
Henderson/Perry)

• Chain conveyors Page 206
• Not as expensive
• Noisy
• Slow
• Inefficient
• Design versatility
• Suited for many different kinds of jobs
• 3 kinds trolley, scraper, and apron

Dr. C. L. Jones Biosystems and Ag. Engineering
7
Lecture 19 Materials Handling(Chpt 8
Henderson/Perry)

• 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)

Dr. C. L. Jones Biosystems and Ag. Engineering
8
Lecture 19 Materials Handling(Chpt 8
Henderson/Perry)

• Chain conveyors
• Scraper
• Flight cross-sections Fig. 8.6 page 209
• Good for granular, nonabrasive materials
• Simple
• Cheap
• Steep inclines
• Raw products
• Portable
• Chain driven

Dr. C. L. Jones Biosystems and Ag. Engineering
9
Lecture 19 Materials Handling(Chpt 8
Henderson/Perry)

• Chain conveyors
• Apron
• Flights are replaced by flat slats, plates or
  boards
• Used for sacked materials and large units

Dr. C. L. Jones Biosystems and Ag. Engineering
10
Lecture 19 Materials Handling(Chpt 8
Henderson/Perry)

• Chain conveyor design Page 210
• Theoretical Power Equation 8.4
• Incline versus capacity Page 211
• Friction Coefficients Page 211 Table 8.2
• Example page 212

Dr. C. L. Jones Biosystems and Ag. Engineering
11
Lecture 19 Materials Handling(Chpt 8
Henderson/Perry)

• 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 limited

Dr. C. L. Jones Biosystems and Ag. Engineering
12
Lecture 19 Materials Handling(Chpt 8
Henderson/Perry)

• Screw Conveyors
• Standard pitch diameter
• Inclines up to 20 degrees

Dr. C. L. Jones Biosystems and Ag. Engineering
13
Lecture 19 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
14
Lecture 19 Materials Handling(Chpt 8
Henderson/Perry)

• Next Lecture will cover
• Bucket elevators
• Oscillating conveyors
• Pneumatic conveyors
• Gravity conveyors
• Cranes, trucks and carts
• Work conveyor problems

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