Over Head Travelling Crane

Over Head Travelling Crane

An overhead crane, commonly called a bridge crane, is a type of crane found in industrial environments.
An overhead crane consists of parallel runways with a traveling bridge spanning the gap. A hoist , the lifting component of a crane,
travels along the bridge.
There are two types design of over head cranes 
1. Single Girder Over Head Travelling Cranes 
2. Double Girder Over Head Travelling Cranes 
Overhead cranes are typically used for either manufacturing or maintenance applications, where efficiency or downtime are critical factors.

EOT (Electric Overhead Traveling) Crane
This is most common type of overhead crane, found in most factories. As obvious from name, these cranes are electrically operated by a control pendant, radio/IR remote pendant or from an operator cabin attached with the crane itself.

Overhead cranes are commonly used in the refinement of steel and other metals such as copper and aluminium. At every step of the manufacturing process, until it leaves a factory as a finished product, metal is handled by an overhead crane. Raw materials are poured into a furnace  by crane, hot metal is then rolled to specific thickness and tempered or annealed , and then stored by an overhead crane for cooling, the finished coils are lifted and loaded onto trucks and trains by overhead crane, and the fabricator  or stamper uses an overhead crane to handle the steel in his factory. The automobile  industry uses overhead cranes to handle raw materials. 

Almost all paper mills use bridge cranes for regular maintenance needing removal of heavy press rolls and other equipment. The bridge cranes are used in the initial construction of paper machines because they make it easier to install the heavy cast iron paper drying drums and other massive equipment.
In many instances the cost of a bridge crane can be largely offset with savings from not renting mobile cranes in the construction of a facility that uses a lot of heavy process equipment.

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