7/23/2019 Tyoes of Cranes and Their Functionality

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Four TypesThere are four main types of overhead lifting systems available. Click on each heading below for further product details. You can also contact us to request a set of brochures or speak with an engineer.Overhead Traveling Bridge CraneThis type of crane runs on an elevated runway system along the length of a factory and provides three axes of hook motion. Both single and double girder bridgedesigns are provided with great flexibility in allowing the hook to be positioned very precisely and for loads to be placed very gently. See our technical reports under the resources button to learn more about single girder versus double girder cranes.Gantry CraneThis type of crane is quite similar to the bridge crane except that it runs on a track at the floor level. The bridge (which carries the hoist and trolley) is supported by a pair of rigid steel legs which, in turn, are carried by a pair ofend trucks along the floor-level runway. The gantry crane provides the same performance characteristics that an overhead bridge crane offers.Jib CraneThis type of crane consists of a pivoting head and boom assembly, which carriesa hoist and trolley unit. The pivoting head is supported either by a floor-mounted mast providing 360°-boom rotation or by an existing building column, which provides 180° of boom rotation. The jib crane can also be motorized to provide precise spotting of loads, however, the hook location is along a radial path rather than a simple X-Y arrangement.

MonorailThis type of overhead lifting system is quite specialized and very effective when properly designed into the factory layout. Only two directions of hook travelare afforded by the monorail: up/down and along the axis of the monorail beam. It is not recommended (and quite dangerous) to push the load out from under the centerline of the monorail beam. The key phrase here is "when properly designed into the factory layout" since monorail systems, by their nature, are most oftenintegrated into continuous production systems for material transport; e.g., hotmetal operations in a foundry, paint booths, etc.

Types of Overhead CranesThis section specifies the kind of equipment you require. Overhead cranes come i

n four basic configurations;Top Running (T/R) - The crane bridge travels on top of rails mounted on a runway beam supported by either the building columns or columns specifically engineered for the crane.Under Running (U/R) - The crane bridge travels on the bottom flange of the runway beam which is usually supported by the roof structure.Single Girder (S/G) - The crane consists of two end trucks, a single bridge girder and the trolley hoist unit. The trolley runs on the bottom flange of the bridge girder.Double Girder (D/G) - The crane consists of two end trucks, two bridge girders and the trolley hoist unit. The trolley runs on rails on top of the bridge girders.