A crane is a kind of machine, capable to lift and
lower heavy materials and to transport them horizontally to other places.
Cranes are used in manufacturing industry, transport
industry, and building and construction industry.
In transport industry, cranes are mainly used to load
and unload the machine. Tower cranes are capable to load and unload containers
at the shipping port. I have watched the sight of cranes loading and unloading
the containers at the port and if you haven’t watched it, I will recommend you
to watch it, you will like it.
In building and construction industry, these machines
are used to maneuver the heavy materials at a construction site. I have seen
many times, the lifting of the parts of over-head bridges in my city.
In manufacturing industry, these cranes are used to
assemble heavy machinery.
One wonders, how these machines are capable to lift
and move heavy things which are beyond the normal.
The secret of the crane is a collection of one or more
simple machines which are further equipped and interlinked with each other,
with a set of hoist, wire ropes or chains, and sheaves. This collection of
machines and its support parts creates the ‘perfect’ mechanical advantage.
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