The industrial overhead cranes are commonly referred to as bridge cranes in different industries. They consist of a metallic hook, termed as the hoist, mounted on rollers or belts that travel on a bridge. Industrial overhead cranes are of several types based on how much capacity of load they are built to handle as well as in how many dimensions they are available to carry different loads. The overhead bridge crane is one of the most widely used types of industrial overhead crane. They are typically used because they provide a very time efficient method for transferring and maintenance applications which is a key part in the industrial world.
Origin of the Steam Industrial Overhead Cranes
A U.K. company was one of the many companies that introduced the first steam-powered crane ready for mass production. Further development in the mechanical industry led to England manufacturing the first electric overhead crane, which was used for hoisting and placing guns in London. The crane was functioning until 1980 after which it was displayed in one of Birmingham’s museum.
The overhead crane consists of a hoist that is moveable in all three axes. It is electrical powered and provides the employees or workers to move on a bridge that rests on top of the crane hence the name “Overhead bridge”. One of the most widely used industrial overhead cranes is called the gantry crane. It is mounted on the floor and moved through belted tracks or either through rollers. Based on the amount of usage and run-time, the Crane Manufacturers Association of America (CMAA) has classified overhead cranes into six classes, A to F, starting from infrequent usage to continuous and intense usage. Selection of different class of overhead cranes depends on several factors including installation costs, maintenance, and work-hour requirements.
Overhead Crane Inspections
Overhead cranes are inspected on a daily basis. The individual components of the crane are checked for irregularities such as a fault in the chain holding the hoist or the hoist itself, the belt on which the crane functions or the joints between the rollers, in case of a gantry crane. However, proper precautions are still taken to an extent that the machines are inspected from a distance rather than up close.
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