Electric Overhead Travelling Crane | EOT Crane | EOT Crane Parts

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EOT Crane:

The most adaptable and the most widely used type of power driven crane for indoor service is undoubtedly the three motion EOT crane. It serves a larger area of floor space within its own travelling restrictions than any other permanent type hoisting arrangement.

With a hoist that is fixed to a trolley, cranes raise and lower the loads. Along a bridge, the trolley travels back and forth. The bridge is travelling on a runway. Some cranes do not have a bridge, such as a jib crane, but they still have a hoist mounted to a trolley and can shift a load horizontally.

A bridge crane is described as a crane with at least one primarily horizontal girder, fixed or able to travel along tracks and fitted with at least one hoisting mechanism. There are four major types of top-running, under-running, single and double-girder overhead cranes.

double-girder-eot-cranes-bridge-crab-hoisting-machinery-set-gantry-girder-rail-on-the-bridge
double-girder-eot-cranes-bridge-crab-hoisting-machinery-set-gantry-girder-rail-on-the-bridge

As the name implies, this type of crane is provided with movement above the floor level. Hence it occupies no floor space and this can never interface with any movement of the work being carried out at the floor of the building.

The three motions of such crane are the hoisting motion and the cross travel motion. Each of the motions is provided by electric motors.

The above characteristics have made this type of crane suitable for medium and heavy workshop and warehouses. No engineering erection shop, machine shop, foundry, heavy stores is complete without an EOT crane.

In a steel plant, rolling mill, thermal power plant, hydraulic power plant, nuclear power plant, this type of crane is considered indispensable. In short in all industries, wherein heavy loads are to be handled, EOT crane find its application.

EOT Crane Parts:

A EOT crane consists of two distinct parts

  • 1. Bridge
  • 2. Crab

Bridge:

semi-automatic-cranes-automatic-cranes-crane_for_automotive_industry-special-cranes-standard
Semi automatic cranes, Automatic cranes, Crane for automotive industry, Special cranes standard

The Bridge consists of two main girders fixed at their ends and connected to another structural components called the end carriages. In the two end carriages are mounted the main runners or wheels (four or more) which provide the longitudinal motion to the main bridge along the length of the workshop.

The motion of the bridge is derived from an electric motor which is geared to a shaft running across the full span of the bridge and further geared to a wheel at each end. In some design separate motors may be fitted at each corner of the main bridge. The wheels run on two heavy rails fixed above the floor level along the length of the shop on two girders, called gantry girder.

Crab:

The Crab consists of the hoisting machinery mounted on a frame, which is in turn mounted on at least four wheels and fitted with suitable machinery for traversing the crab to and fro across the main girders of the crane bridge. Needless to mention that the crab wheels run on two rail sections fixed on the top flange of the main bridge.

Thus the load hook has three separate motions, these being the hoisting, cross traverse of the crab, and longitudinal travel of the whole crane. Each motion is controlled independently of the other motions by separate controllers situated in a control cage or in a suitable position for controlling from the floor by pendent chains.

double-girder-eot-crane-qd-winch-type-specification-features-performance
double-girder-eot-crane-qd-winch-type-specification-features-performance

The essential parts are:

eot-crane-essential-parts-eot-crane-working
eot-crane-essential-parts-eot-crane-working
  1. Bridge– 2 No’s
  2. End carriage– 2 No’s
  3. Wheel of the bridge– At least 4 No’s
  4. Crab (without auxiliary hoist)– 1 No’s
  5. Hoisting machinery set– 1 No’s
  6. Wheels of crab– At least 4 No’s
  7. Bottom Block (without auxiliary hoist)– 1 No’s
  8. Lifting hook– 1 No’s
  9. Rail on the gantry girder for crane movement– 2 No’s
  10. Rail on the bridge for crab movement– 2 No’s
  11. Operators cabin– 1 No’s
Crane-Parts-Overhead-crane-parts-EOT-crane-parts
Crane Parts-Overhead crane parts-EOT crane parts
Parts-of-the-EOT-crane-Electric-overhead-Travelling-Crane-Crane-parts
Parts of the EOT crane – Electric overhead Travelling Crane – Crane parts

d2c40 01 double girder eot crane qd winch type specification features performance thumb Electric Overhead Travelling Crane EOT Crane EOT Crane

15 comments on “Electric Overhead Travelling Crane | EOT Crane | EOT Crane Parts”

  1. need some more precise information……with some examples..like loads acting on crane , distance & height calculations , catalogues ,etc.

      1. I SEARCH ALL THE BOOK STORE. THIS BOOK NOT AVAILABLE IN THAT STORE. WHEN I GET THIS BOOK. PL HELP ME SIR.

    1. respected sir,
      i am studying mechenical engineering in jeppiar engineering college. i am doing my final year project in the topic of “DESIGN OF ELECTRIC OVERHEAD TRAVELLING CRANE” for 10TONES. SPAN-17750MM, HEIGHT OF LIFT-6000mm,DUTY CLASS-4,GIRDER TYPE-DOUBLE, APPLICATION-INDOOR, MATERIAL TO LIFT- IRON FABRICATION, OPERATION- FLOOR OPERATION, SPEED( MAIN HOIST-3M/MIN, LONG TRAVEL-12M/MIN,CROSS TRAVEL-15M/MIN),MOTOR TYPE-SQUIRREL CAGE,HEIGHT FROM GROUN FLOOR-5800MM,CRANE RAIL TO TRUSS TIE LEVEL CLEARENCE-1400MM.

      I WANT DESIGN ALL THE PART OF E.O.T. 1.bridge grider. 2.crap, 3.end carrige.

      1. I am Happy to Help you. your project is very nice you can send me details and get all the information which is required you

    2. SIR,
      I WANT ONE BOOK.NAME- MATERIAL HANDING EQUIPMENT,
      AUTHOR-REDENKO.N,PUBLISHERS- MIR PUBLISHERS

  2. Really a very helpful article thanks for sharing and keep on sharing!
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  3. Thanks for providing the detailed information about Electric Overhead Travelling Crane. I really like the way you have explain each and every part about it. Waiting for more blogs to update.

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