30 Questions
What course is being taught in the fall of 2023?
Materials Handling ENGR 3307
Who is the instructor for the course Mechanical Handling - Belt Conveyors I?
Dr. Ahlam Maremi
In which school is Dr. Ahlam Maremi teaching?
Bharti School of Engineering
What is the greatest use of belt conveyors according to the text?
Mining and quarrying industry
What caused problems when carrying heavier materials on belt conveyors?
Wearing of the idlers and splitting of the conveyor belt
What is the basic configuration of a belt conveyor?
An endless strap of flexible material stretched between two drums and supported at intervals on idlers
What is a remarkable example of a belt conveyor mentioned in the text?
Large-scale belt conveyor in the USA carrying 10,000 tonne/day of coal
What are impact idlers used for?
To reduce wear on the belt at the loading point
What is the function of self-adjusting troughing idlers?
Automatically increase the troughing angle with the load on the belt
What are steel idlers usually used for?
Severe working conditions (handling corrosive materials)
What is the purpose of return idlers?
To support the return side of the belt and protect against build-up of fine materials
Why is matching the belt to idlers important?
To minimize wear of the belt
What are the consequences of incorrect matching of belt to idlers?
Permanent damage to the belt with consequent problems of wear and spillage
What is the significance of the transition from troughed to flat belt?
It affects the belt's transition at the discharge point
What is the recommended transition from troughed belt to flat belt for a 10° troughing angle?
One belt width
What percentage of fuel energy is used in moving the payload in truck haulage?
40%
What is a traditional disadvantage of conveyors?
Relative inability to handle curved routes
What is an advantage of conveyors over trucks in terms of manpower requirements?
Low manpower requirements
What is a potential disadvantage of conveyors in underground environments?
Inflexibility and difficulty of installation
What are the main components of belt conveyors?
Belt, idlers, drive arrangements, power unit, loading and discharge arrangements, and belt cleaners
What influences the choice of cover materials for a conveyor belt?
Nature of conveyed material, quantity to be conveyed, method of material feed, belt speed, and environment
What is the function of additional layers of fabric (breakers) in a conveyor belt?
Increase adhesion, impact resistance, and cushioning
What is the maximum accepted angle for smooth-surfaced troughed belts when operated on an upward incline?
Around 16° - 20°
What is the purpose of belt patterns like cleats or flights in belt conveyors?
Work on steeper inclines and increase carrying capacity
What dictates the choice of carcass and cover materials for a conveyor belt?
Parameters such as maximum tension in belt, impact forces, and flexibility required
What is the typical conveying capacity of a Japanese 3 m wide belt for sand and rock?
30,000 tonnes/hr
What is the typical conveying capacity of a 15-km belt conveyor in a UK coalfield for coal?
3,200 tonnes/hr
What is the most vulnerable and expensive part of a conveyor?
The belt
What is involved in designing belt conveyor systems?
Calculating belt tensions, take up force, idler spacing, and required motor horsepower
What are the layers of a conveyor belt composed of?
Two to ten layers of woven fabric bonded together with rubber
Study Notes
Belt Conveyor Construction and Operation
- A 15-km belt conveyor in a UK coalfield can convey 3,200 tonnes/hr of coal at speeds up to 8.4 m/s.
- Japanese 3 m wide belt can convey sand and rock at a rate of 30,000 tonnes/hr.
- Belt conveyors consist of components like belt, idlers, drive arrangements, power unit, loading and discharge arrangements, and belt cleaners.
- Designing belt conveyor systems involves calculating belt tensions, take up force, idler spacing, and required motor horsepower.
- Most conveyors use a conventional flat belt, but special forms are available for specific applications.
- The belt is the most vulnerable and expensive part of a conveyor and represents a substantial proportion of the overall capital cost.
- A conveyor belt consists of a core (carcass) and a cover, usually composed of two to ten layers of woven fabric bonded together with rubber.
- The choice of carcass and cover materials is dictated by parameters such as maximum tension in belt, impact forces, and flexibility required.
- The main features influencing the choice of cover are the nature of conveyed material, quantity to be conveyed, method of material feed, belt speed, and environment.
- Additional layers of fabric (breakers) may be fitted next to the carcass to increase adhesion, impact resistance, and cushioning.
- Belt conveyors are operated on an upward incline, with the maximum accepted angle for smooth-surfaced troughed belts being around 16° - 20°.
- Belt patterns like cleats or flights are used to work on steeper inclines and increase carrying capacity. Cleat height is typically between 1.5-2.5 cm.
Test your knowledge of mechanical handling and belt conveyors with this quiz from the Mining Optimization Laboratory at Laurentian University. Designed for students of materials handling, this quiz covers key concepts and principles taught in the course ENGR 3307.
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