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SAMPRA :: Double Girder Electric Overhead Travelling Crane

DOUBLE GIRDER EOT CRANE


DG EOT crane is a type of overhead travelling crane in which there are two nos. (double) girders. It consists of trolley/ crab which is mounted on bridge/ girder.

Trolley/ Crab

Trolley consists of a structural frame on which hoist mechanism and cross travel mechanism of crane are mounted. The hoist mechanism is used to lift the load. The cross travel mechanism is used to move the lifted load across the span of crane. Trolley moves on rails fixed on top of the bridge or girder.

Bridge/ Girder

Bridge consists of single web or double web box type structural construction. The strength of these girders takes care of the load to be lifted. Long travel drive assembly is provided on either sides of the bridge for movement of the crane on the gantry rails.


Double Girder EOT Crane
Double Girder EOT Crane


Hoist Mechanism

The Hoist Mechanism of crane consists of assembly of motor, gearbox, brake, coupling, drum, wire rope and hook block. The hook block or bottom block consists of sheave assembly which supports a swivel hook. The hook block is suspended from drum through wire rope. The wire rope is wound on grooved drum which is long enough to accommodate the length of rope required for the specified lift. Selection of wire rope diameter is dependent upon load to be lifted and the number of rope falls. Depending upon rope reeving arrangement either rope balancer or equiliser sheave may be provided on the trolley frame. The hoist drum is driven through motor- brake- gearbox- coupling arrangement. Connection between rope drum & gearbox is through either flexible geared coupling or barrel coupling.


Cross Travel Mechanism

The Cross Travel Mechanism of crane consists of assembly of motor- brake- coupling- gearbox - wheel. The cross travel wheel runs on rails installed on the bridge/ girder of the crane.

As a safety feature Gravity Limit Switch & Rotary Limit Switch are provided for hoist motion and a two way lever operated Limit Switch is provided for CT motion. Also rubber buffers or spring buffers are provided at the four corners of the trolley for safety purpose.


Long Travel Mechanism

The Long Travel Mechanism of crane consists of assembly of motor- brake- coupling- gearbox - wheel. The LT wheel runs on rails provided on the gantry. Crane wheels are generally double flanged. However Flange-less wheels with guide rollers are also used.

For safety purpose spring or hydraulic buffers are provided at the four corners of the bridge of crane. Also a two way lever operated Limit Switch is provided for LT motion.

The crane is operated from either operator cabin installed below the bridge or pendant hanging from crane or radio remote control of the crane.


Use our DG EOT Crane Design Calculation Software for obtaining design parameters of various components of Double Girder Electric Overhead Travelling (EOT) Crane.