The Advantages And Use of A Double Girder Overhead Crane
An overhead crane with double girders for support is used quite a bit for the hoisting and moving of heavy machinery and equipment. It is made up of four distinct parts, a bridge frame consisting of two main girders and two end beams, a traveling mechanism, and a trolley with a frame and electrical parts. The bridge frame is composed a main girder of a box shape, an end beam, a walkway, a rail and an operating cabinet.
The advantages of a double girder overhead crane are its strength and rigid torsion capability. In addition, the configuration provides for minimum wear as the connections between the girders are engineered to precise machined tolerances in order to provide for minimum wear. This makes the entire crane operation extremely stable.
The crane is very highly cost effective too, it has a very low dead weight factor, and it has a very reliable monitoring and preventative maintenance capability.
The exceptional load capacities that these devices offer allow for the movement and carrying capacity that are just not available in other applications. They provide extremely stable and productive operations for very heavy pieces of equipment and machinery.
Double girder overhead cranes provide for a greater hook height, allowing for the transport of taller equipment. This allows for a double girder crane to have more lift as the hook is located between the cross girders, not under a cross girder. This allow for the height of the life to be 18 to 36 inches higher than a single girder crane where the lift is limited to the height of the girder itself.
A double girder crane also allows for the lifting mechanism to be what is called “top running” which means that it can run along a track that is set on top of the double girder assembly, as opposed to an assembly that is located under the girder, as in a single girder crane setup.
The top running setup for the overhead crane assembly is very good for handling and lifting of extremely heavy loads, particularly those that weigh 20 tons or more. With a 20 ton load or more the crane assembly is actually tied into the building’s support steel to give it added strength.
A top running overhead assembly is also very useful when very high headroom is required for extremely heavy and very tall items that need to be transported.
The length of the carry is also a consideration, as when the distance to transport an object is 60 feet or more, a double girder crane is the method most acceptable for use.
Double girder cranes are very handy when the space between the girders need to be filled with cabs, crane lights, walkways, cable reels and other necessary types of equipment.
A double girder crane also allows for two hoists to be placed on one trolley, so there can be more accomplished with a minimum of effort.
Depending upon the nature and the weight of objects that need to be transferred, a double girder crane handles most of the very heavy work that is done in industry.