Bridge cranes or otherwise called overhead cranes are a type of industrial material handling crane with a line and hook apparatus that runs on a horizontal beam running along two widely separated rails. Lots of overhead cranes can be seen within a long factory building and they may run along the building's two long walls, like a gantry crane.
Usually, overhead cranes have either a double beam or single beam construction. These can be built by making use of either typical steel beams or a more complex girder style. The single bridge box girder crane is complete with the hoist and the system and is operated with a control pendant. When the application requires heavier capacity systems for at least ten tons, double girder bridge cranes are usually utilized.
Amongst the major advantages of the box girder type of configuration is that it provides stronger overall system integrity with a lower deadweight. Another advantage will be the hoist to lift the objects and the bridge which spans the area covered by the crane, together with a trolley to move along the bridge.
Overhead cranes are more commonly utilized within the steel business. The steel is dealt with utilizing this crane at each level of the manufacturing method 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 utilizing an overhead crane. Once the coils are finished they are loaded onto trains and trucks making use of overhead crane. The stamper or fabricator likewise relies on overhead cranes in order to handle steel inside the factory.
Overhead cranes are commonly used in the automobile trade for the dealing with raw material. There are smaller workstation cranes that are designed to deal with lighter loads in work places like in CNC shops and sawmills.
Bridge cranes can be seen in just about all paper mills. They are used for usual maintenance requiring removal of heavy press rolls and other machines. Some of the cast iron paper drying drums as well as several pieces of specialized machines weigh as heavy as seventy tons. The bridge cranes are utilized in the initial construction of the paper machines so as to facilitate installation of these very heavy items.
The price of a bridge crane can be mostly offset in numerous cases with savings incurred from not leasing mobile cranes when a facility is being made which uses plenty 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 more than a Jib crane by making it possible to offer a longer reach while eliminating lateral strains on the building walls.
Demag Cranes & Components Corp. was amongst the first companies to mass produce steam powered cranes. The now defunct Alliance Machines were the second company to mass produce cranes. Alliance holds an AISE citation for one of the earliest cranes in the United States market. This crane was used in service until around the year 1980 and has been retired into a museum in Birmingham, Alabama.
Many innovations have come and gone since the first cranes, for example, the Weston load brake is at present practically obsolete, whereas the wire rope hoist is still popular. The wire rope hoist was at first hoisted to contain components mated together to form a built-up style hoist. These super industrial hoists are utilized for heavy-duty applications like steel coil handling for instance. They are even common for users who want better quality and long life from their piece of equipment. These built up hoists likewise provide for easier repairs.
These days, most hoist are package hoists meaning that they are built into one unit in a single housing. These hoists are normally designed for ten years of life. This calculation is based on an industry standard wear and tear when calculating actual life.
The Material Handling Trade in North America, there are very few governing bodies in the industry. The Crane Manufacturers Association of America is represented by the Overhead Alliance that also represents HMI or likewise referred to as Hoist Manufacturers Institute and MMA or otherwise referred to as Monorail Manufacturers Association. The members of this particular group are marketing representatives of the member companies and these product counsels have joined forces to generate promotional materials in order to raise the awareness of the benefits to overhead lifting.