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Crown Conveyor Pulley - How it Works
Pulleys, which may be drum-type or roller-type, will be the most typical simple machines used to drive the belt of all conveyors systems. Due to its wide use, manufacturers have made improvements for better system performance and longer life. One of these is the crown conveyor pulley.

Pulleys are tubular-shaped drums that are used to operate a vehicle the belt of a conveyor system. The drive pulley is connected to a motor, which, therefore, transfers the torque required to steer the conveyor belt. Consequently, the conveyor belt moves along the path. However, because of its mechanism, the common problem for some conveyor pulleys may be the tendency of the conveyor belt to go sideways or from its supposed track. At these times, the belt is exposed to excessive wear as it rubs contrary to the conveyor frame and in effect, it deteriorates faster. Also, the rubbing causes friction, which, in turn, results in increased drive motor load and power consumption aswell.

This is where crowned pulleys come in useful. They are installed to make sure that the belt is on track and not drifting sideways. Whether tapered or What Does IV Stand For? Understanding The Essentials Of Intravenous Poles , crowned pulleys consist of a drive pulley with a center diameter that is slightly longer than those of the ends. The diameter difference causes the belt to correct itself by constantly moving back on its track when it will drift away.

Its drawback, however, may be the cost. The material itself along with the machining process causes it to be a bit expensive. At present, heavy metal is used for the wall tubing of the crown. And during the machining process, substantial unusable portions of the material are wasted.

As the belt conveyor moves, the drive pulley will slip. This led the manufacturers to build up drive pulleys with smaller diameters. But as the diameter is smaller, there is less surface area contact with the conveyor belt. This, subsequently, results in limited torque transmission. To solve this problem, engineers thought that molding rubber or some synthetic material to the drive pulley surface would raise the grip and, in place, torque transmission. The rubber covering is what they call lagging. Lagging provides the necessary traction in order for the pulley to work more efficiently.

Rubber material is compounded and put on the pulley. Manufacturers do vulcanized lagging in different degrees of hardness in accordance with customer specifications, in any diameter or length. There are various patterns to pick from - plain, ceramic, crown, herringbone and groove patterns. However, this may be expensive. The procedure of placing the rubber to the roller and the material itself is relatively high in cost. There is a cheaper alternative to lagging, which includes wrapping the lagging. The effect is a crown-like influence on the pulley. The disadvantage of the type of lagging may be the effect of stretching the conveyor belt.

Crown conveyor pulleys can be quite useful, if you know how to use and look after it. Proper machine handling and maintenance can do wonders in increasing its life. So if you are thinking of using one of these for the plant or business, know the basic mechanism and discover the useful innovations made on it. While it could be costly at first, however in the long run you are able to save your money due to many years that the machine can serve you.
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