An overhead crane, also called EOT crane or bridge crane, is kind of material handling products that is critical for work flow production. It involves a hook-and-line mechanism that runs along a horizontal runway rails which locate on a supporting structure called a runway beam.
Overhead cranes include single girder or double girder designs which depend on your lifting capacity or application. Typically, single girder designs support lifting capacities up to approximately 20 tons with spans of 30 meters. Anything above would be supported by a double girder.
Choosing the right solution is crucial as there are multiple configurations that need to suit your needs. This is why a majority of them are custom tailored per application.
1. What is the lifting capacity you need?
The maximum weight of your application should not exceed the lifting rated capacity of your crane.
2. What is the crane span needed?
The span or width of your crane system is critical in determining the size of the crane needed. Will it be the width of your building or a work station? An example would be that typically, overhead cranes operate from the ceiling of your building and gantry cranes on the floor in a specific work area.
3. How long will the crane be used?
The operational frequency that your crane will be used will define the crane service class required for your application. For example, in USA each service class is clearly defined using the CMAA by the Material Handling Industry of America. In China, There is also similar class definition, but the simple way to find out the service class of crane required is telling us what your crane is used for. We will make a suitable judgement as per your application.
4. Free standing or building attached runways?
Typically, overhead crane systems are supported by runway structures that are attached to the building to reduce the amount of space needed for the structure. An alternative method is a free standing runway to support your structure.