Overhead cranes are otherwise called bridge cranes. They are a kind of crane that consists of a hook and line mechanism that runs along a horizontal beam which runs along two widely separated rails. Various overhead cranes could be seen inside a long factory structure and they may run along the building's two long walls, like a gantry crane.
Overhead cranes usually include either double beam or one beam construction. These are made out of normal steel beams or more complex girders. The single bridge box girder crane is complete with the hoist and the system and is operated using a control pendant. If the application requires heavier capacity systems for at least ten tons, double girder bridge cranes are more common.
One of the major benefits of the box girder kind of configuration is that it supplies stronger overall system integrity with a lower deadweight. Another advantage will be the hoist in order to lift the stuff and the bridge which spans the area covered by the crane, together with a trolley in order to move along the bridge.
Overhead cranes are most frequently utilized in the steel trade. The steel is dealt with utilizing this particular crane at each stage of the manufacturing process until the product is delivered from the factory. The crane is likewise responsible for pouring raw materials into a furnace and hot steel is then stored for cooling via an overhead crane. As soon as the coils are finished they are loaded onto trucks and trains making use of overhead crane. The fabricator or stamper also relies on overhead cranes so as to handle steel inside the factory.
Overhead cranes are usually utilized in the automobile industry for the dealing with raw material. There are smaller workstation cranes which are designed to deal with lighter loads in work areas like for example in CNC shops and sawmills.
In nearly all paper mills, bridge cranes could be seen being utilized for normal maintenance needing the removal of heavy press rolls and various machines. Some of the cast iron paper drying drums and several pieces of specialized machines weigh as heavy as 70 tons. The bridge cranes are utilized in the primary construction of the paper equipment in order to facilitate installation of these very heavy items.
The cost of a bridge crane could be mostly offset in lots of cases with savings incurred from not renting mobile cranes when a plant is being constructed that utilizes lots of heavy process machinery.
The Rotary Overhead crane has one end of the bridge mounted on a fixed pivot and the other end carried on an annular track. The bridge traverses the circular area underneath. Rotary Overhead cranes offer improvement over a Jib crane by making it possible to offer a longer reach while eliminating lateral strains on the building walls.
Among the first companies in the world to mass produce the first steam powered crane was Demag Cranes & Components Corp. Following along came Alliance Machine, who is now defunct. Alliance holds an AISE citation for one of the earliest cranes in the United States market. This particular crane was used in service until about 1980 and has been retired into a museum in Birmingham, Alabama.
Numerous innovations have come and gone ever since the first cranes, for example, the Weston load brake is now almost obsolete, while the wire rope hoist is still popular. The wire rope hoist was first hoisted to contain components mated together so as to form a built-up style hoist. These super industrial hoists are used for heavy-duty applications such as steel coil handling for instance. They are even common for users who want better quality and long life from their machine. These built up hoists even provide for easier repairs.
Today, several hoists are package hoists. This means they are built as one unit in a single housing that is usually designed for ten years of life. This estimate is based on an industry standard wear and tear when calculating actual life.
In the present North American Material Handling Trade, there are some governing bodies for the business. The Overhead Alliance is a group which represents CMAA, or also known as Crane Manufacturers Association of America, HMI or Hoist Manufacturers Institute and MMA or otherwise known as Monorail Manufacturers Association. The members of this group are marketing representatives of the member companies and these product counsels have joined forces to make advertising materials to be able to raise the awareness of the benefits to overhead lifting.