Nowadays, escalator has
been part of our lives, when going out to the mall, going to work or going to
any big buildings or huge establishments. Escalator creates a big help
especially to those with minor disability that cannot walk through high
stairways. For those people whose handicap or totally disabled that cannot even
stand or walk, elevator is a big help. But don’t even wondering how these
helpful machinery worked? It is accompanied with different parts affixed that
help to its accurate condition when it’s working. One of the most useful parts
of an escalator is the escalator roller. There are different kinds of escalator rollers that are fit to some escalator parts such as the chain roller, step
roller, tension roller, fraction roller, drive roller, handrail roller. These
rollers are useful not only for escalator and elevator in accordance with the
trade standard but also to non-standard merchandise which is referred by the
customer' requirements. The specifications and functions of some escalator
rollers are discussed as follows.
Chain Roller
A Chain roller is a simple, dependable, and
efficient means of power transmission. It is the most common type chain drive
that is used for transmission of mechanical power on many varieties of
domestic, industrial and agricultural machinery which is consists of a sequence
of short cylindrical rollers detained together by lateral links and driven by a
toothed wheel or commonly described as the sprocket. Chain roller comes into
different sizes which may provide a smooth and accurate transmission of power.
Tension roller
Tension roller is a loose
pulley which aims to maintain belt tension and
increase the distance
viewpoint of the small
pulley of a belt transmission.
This kind of rollers is usually installed on the driven
side of the belt
near the small
pulley. But somehow when the transmissions
with tension rollers
have decreases the service life of the
belt because of additional
flexure then it will become as one of its disadvantage.
Handrail
Roller
An escalator
system includes a handrail where it
includes a handrail guide and a variety
of descending bearing chains interrelated to form a handrail chain and protected to the handrail guide. There are numbers of a roller that are tenable to at least one end of
the channel and that has a rolling contact with the handrail. A chain which includes rolling
elements, such as roller bearings, can be added between the handrail guide and the handrail. Usually, chain is immovable to the
handrail guide, with the roller
bearings attached at the handrail. The
process results to a rolling contact, and a rolling friction between the handrail and handrail guide. However when operating, it
produces undesirable noise because of broken sealing of the roller bearing that
causes the lubricants to leak which results to dry rubbing that produces the noise.
Furthermore, when the roller bearing chain is exposed to a side force, the
roller bearing interacts and buffs against the handrail guide which also may also produce an
undesirable noise.
