49 Questions
What are the components of belt conveyors mentioned in the text?
Belt construction, idlers, drive arrangements, power unit, loading and discharge arrangements, belt cleaners
Where does the transported material get loaded in a basic belt conveyor?
Tail end
What is the primary consideration for the drive arrangement in a belt conveyor?
Driving the head end drum to involve the smallest amount of belt subjected to maximum tension
What does the drive arrangement in a belt conveyor primarily consist of?
Motor and reducer
What is essential to use at the head end of belt conveyors when transporting bulk materials that tend to stick to the belt?
V-shaped plough
What can cause the belt to run off-center and shorten its life?
Sharp particles pressed into the belt cover
What is an effective cleaning method for sticky materials on belt conveyors?
Water spray followed by rubber wiper blades
What does the conveying rate (C) depend on?
Belt speed and material density
What is the surcharge angle defined as?
The angle to the horizontal which the surface of the material assumes while at rest on a moving conveyor belt
What is the usual practice for allowing maximum lump size on a belt conveyor?
One-fifth (1/5) of the belt width for surcharge angles of 20°
What properties of the conveyed product should be considered?
Moisture content, dustiness, and lump size
What is the date for the final report deadline?
November 6th, 2023
When is Quiz 2 scheduled?
November 7th at 3:00 PM
When is the final exam?
December 9th at 2:00 PM
Which factors affect conveyor drive efficiency?
Tension difference, friction, and angle of wrap
How can increasing power transmission be achieved?
Increasing friction coefficient, angle of wrap, or using multiple drives
Which type of motor is commonly used for belt conveyors?
Squirrel cage induction motor
What is the purpose of bend and snubbing pulleys?
To reverse the belt to avoid contact with dirty side
What should the loading system provide to avoid spillage or dust generation?
Steady flow and uniform distribution
What are the common drive types for belt conveyors?
Plain, snubbed, tandem, and dual drives
What type of motor is used for constant speed and severe starting conditions?
Compound DC motor
What do chutes do in a belt conveyor system?
Direct product flow onto the belt and minimize spillage
What offers flexibility in motor selection for belt conveyors?
Speed control devices such as fluid couplings and eddy-current couplings
Where should the conveyor drive be when operating downhill?
At the tail end
What factors should be considered when selecting driving motor and power transmission?
Speed requirements, electrical power supply type, environmental conditions, and starting characteristics
How is loading of bulk material onto a belt conveyor usually done?
From a hopper by direct gravity discharge or from a preceding conveyor or feeder
What are the components of belt conveyors mentioned in the text?
The components of belt conveyors mentioned in the text are: belt construction, idlers, drive arrangements, the power unit, loading and discharge arrangements, and belt cleaners.
Where does the transported material get loaded in a basic belt conveyor?
The transported material is loaded at the tail end or feed end of a basic belt conveyor.
What does the drive arrangement in a belt conveyor primarily consist of?
The drive arrangement in a belt conveyor primarily consists of the motor and reducer.
What is the purpose of the drive arrangement in a belt conveyor?
The purpose of the drive arrangement in a belt conveyor is to supply the torque (rotating force) to create the necessary motion for the pulley to move the conveyor belt.
What are the two types of belt-cleaning devices mentioned in the text?
Rotary brushes or scraper blades of steel or rubber
What is the formula for calculating the conveying rate (C) of bulk materials on a belt conveyor?
$C = a \times \rho \times v$
What is the bulk density of a material and how does it affect the conveying rate?
The bulk density is the mass of the material divided by its total volume. It affects the conveying rate as higher bulk density leads to a higher conveying rate.
What is the surcharge angle and how does it influence the height of material piled on a conveyor belt?
The surcharge angle is the angle to the horizontal which the surface of the material assumes while at rest on a moving conveyor belt. It influences the height of material piled on a conveyor belt by affecting the movement of the belt and the heap of material.
What are some properties of the conveyed product that should be considered?
Moisture content, dustiness, cohesiveness and adhesiveness, abrasiveness, chemical corrosiveness, and lump size
What is the usual practice for allowing maximum lump size on a belt conveyor?
One-fifth (1/5) of the belt width for surcharge angles of 20° and one-tenth (1/10) of the belt width for surcharge angles up to 30°
What are the learning outcomes mentioned at the end of the lectures?
Drive arrangements, the power unit, loading and discharge arrangements, belt cleaners, and the bulk solid to be transported
Where should the conveyor drive be when operating downhill?
At the tail end
What factors affect conveyor drive efficiency?
Tension difference, friction, and angle of wrap
How can increasing power transmission be achieved?
By increasing friction coefficient, angle of wrap, or using multiple drives
What are the common drive types for belt conveyors?
Plain, snubbed, tandem, and dual drives
What are bend and snubbing pulleys used for?
To reverse the belt to avoid contact with dirty side
What factors should be considered when selecting driving motor and power transmission?
Speed requirements, electrical power supply type, environmental conditions, and starting characteristics
Which type of motor is commonly used for belt conveyors?
Squirrel cage induction motor
What type of motor is used for constant speed and severe starting conditions?
Compound DC motor
What speed control devices offer flexibility in motor selection?
Fluid couplings and eddy-current couplings
How is bulk material usually loaded onto a belt conveyor?
From a hopper by direct gravity discharge or from a preceding conveyor or feeder
What should the loading system provide to avoid spillage or dust generation?
Steady flow and uniform distribution
What are chutes used for in a belt conveyor system?
To direct product flow onto the belt and minimize spillage, with skirt plates to confine the product and minimize abrasion
Study Notes
Conveyor Drive Arrangements and Power Units
- Conveyor drive should be at the tail end when operating downhill
- Factors affecting conveyor drive efficiency include tension difference, friction, and angle of wrap
- Increasing power transmission can be done by increasing friction coefficient, angle of wrap, or using multiple drives
- Common drive types include plain, snubbed, tandem, and dual drives
- Bend and snubbing pulleys can reverse the belt to avoid contact with dirty side
- Factors to consider when selecting driving motor and power transmission include speed requirements, electrical power supply type, environmental conditions, and starting characteristics
- Squirrel cage induction motor is commonly used for belt conveyors
- Compound DC motor is used for constant speed and severe starting conditions
- Speed control devices such as fluid couplings and eddy-current couplings offer flexibility in motor selection
- Loading of bulk material onto a belt conveyor is usually from a hopper by direct gravity discharge or from a preceding conveyor or feeder
- Loading system should provide steady flow and uniform distribution to avoid spillage or dust generation
- Chutes are used to direct product flow onto the belt and minimize spillage, with skirt plates to confine the product and minimize abrasion
Conveyor Drive Arrangements and Power Units
- Conveyor drive should be at the tail end when operating downhill
- Factors affecting conveyor drive efficiency include tension difference, friction, and angle of wrap
- Increasing power transmission can be done by increasing friction coefficient, angle of wrap, or using multiple drives
- Common drive types include plain, snubbed, tandem, and dual drives
- Bend and snubbing pulleys can reverse the belt to avoid contact with dirty side
- Factors to consider when selecting driving motor and power transmission include speed requirements, electrical power supply type, environmental conditions, and starting characteristics
- Squirrel cage induction motor is commonly used for belt conveyors
- Compound DC motor is used for constant speed and severe starting conditions
- Speed control devices such as fluid couplings and eddy-current couplings offer flexibility in motor selection
- Loading of bulk material onto a belt conveyor is usually from a hopper by direct gravity discharge or from a preceding conveyor or feeder
- Loading system should provide steady flow and uniform distribution to avoid spillage or dust generation
- Chutes are used to direct product flow onto the belt and minimize spillage, with skirt plates to confine the product and minimize abrasion
Test your knowledge of conveyor drive arrangements and power units with this quiz. Explore factors affecting drive efficiency, common drive types, motor selection, loading systems, and more.
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