Conveyors Flashcards
What is a tripper?
A device that allows the discharge of material from either selected points or any point along the length of a conveyor
What is a feeder?
Provides a constant uniform feed of the product being transferred, onto the belt.
What are translation conveyors and
in-line chutes used for?
They are used to load material onto a belt with a minimum of spillage
What are grizzly bars used for?
They allow fine material to trickle through the bars to the belt underneath just prior to the discharge point, the fine material acts as a cushion for the larger lumps, thus reducing belt wear
How much clearance is usually recommended between skit boards and the conveyor?
About 1”
Why should you never use old conveyor belt as a skit rubber?
Old conveyor belt is often harder the a new conveyor belt and will wear itself through the new belt.
Always use a softer rubber then the belt itself
What are the two main automatic gravity take-ups?
Vertical gravity take-ups
Horizontal carriage take-ups
When would you typically use screw take-ups?
On short conveyors
What are the three main sections a belt is composed of?
Top cover
Bottom cover
Carcass
What part of a conveyor belt carries the load and tension?
The carcass
How must you splice a steel cord belt?
You must hot vulcanize this belt
In a multiple-ply conveyor belt what is the breaker fabric and where is it located?
It is an open mesh to reinforce against longitudinal breaking under impact.
It is just below the top cover
What are the 4 basic types of conveyor carcasses?
Solid woven
Reduced-ply
Multiple-ply
Steel cord
What are the three basic splicing methods for conveyor belts?
Mechanical
Cold self-vulcanizing
Hot vulcanizing
IP Question
What is the recommended belt angle for a hot vulcanized splice?
22°
What is the main purpose of a lagged drive pulley?
To increase the coefficient of friction between the belt and the pulley.
What is the purpose of a self-cleaning pulley?
It prevents the build up of material between the pulley and the belt.
Usually used on slow-speed conveyors
What is the standard crown of a crowned pulley?
1/8” per foot of pulley face width
What is the advantage of a crowned pulley?
They help to keep the belt centred on the pulley
What is a snub pulley?
Used to increase the arc of contact of the belt. From normally 180° without a snub pulley, to a maximum of 240° with a snub pulley.
What are troughing idlers?
Carriying idlers that form a trough shape to increase the belt carrying capacity and reduce material spilling
On frame mounted troughing idlers, what are the 3 standard incline in degrees for the two outside rollers?
20°
35°
45°
How much tilt do some troughing idler frames have to help maintain the belt tracking?
2° off vertical in the direction of travel
What are suspended (catenary) idlers?
Series of rollers mounted on a flexible steel cable and are attached to the side frames of the conveyor
What is the purpose of transition idlers?
They are installed just before the head pulley or just after the tail pulley on troughed conveyors. There purpose is to gradually trough or flatten the belt.