Electric Overhead Travelling (EOT) Cranes are vital in modern manufacturing and material handling environments. Designed for lifting and transporting heavy loads across industrial bays, EOT Cranes are used in industries like steel, automotive, power, cement, shipbuilding, and warehouses. But what exactly makes up an EOT Crane?
In this blog, we’ll explore the essential components of an EOT Crane and explain their specific functions to help you better understand how these powerful machines operate.
Bridge
The bridge is the main structural component of an EOT Crane. It spans the width of the building and supports the hoisting mechanism. It typically consists of one (Single Girder) or two (Double Girder) horizontal girders.
Function: Provides the path for the hoist and trolley to travel across the span of the crane bay.
Also known as end trucks, end carriages are mounted at both ends of the bridge. They house wheels that move on the rails fixed on the gantry runway.
Function: Enable the entire bridge to move along the length of the bay, allowing the crane to cover the full workspace.
The hoist is the lifting component of an EOT Crane. It may be an electric wire rope hoist or an electric chain hoist, depending on the capacity and application.
Function: Lifts and lowers loads vertically using a wire rope or chain.
The trolley carries the hoist and moves horizontally across the bridge girder. It can be a fixed-type trolley (for smaller cranes) or a movable-type (for larger applications).
Function: Facilitates lateral movement of the hoist for precise load positioning.
Crane Runway Rails
These are mounted on the gantry girder and allow the end carriages to move. They must be perfectly aligned to ensure smooth crane travel.
Function: Serve as the track for the crane to move back and forth along the bay.
Long Travel (LT) Drive
The long travel drive mechanism powers the movement of the entire EOT Crane along the runway rails via the end carriages.
Function: Allows the crane to traverse the length of the workshop or factory.
Cross Travel (CT) Drive
The cross travel drive is responsible for moving the trolley (and the hoist it carries) across the bridge.
Function: Enables lateral movement of the hoisting unit to position the load accurately.
This houses the electrical controls including contactors, overload relays, transformers, and PLC (if used).
Function: Controls and coordinates the crane’s operations, safety features, and drive systems.
The operator controls the crane via a pendant control (wired) or radio remote control (wireless).
Function: Allows the operator to control the crane movements safely and precisely (up-down, left-right & forward-backward).
Brakes
Brakes are provided on all motion drives – hoisting, cross travel, and long travel. These are typically electromagnetic or hydraulic.
Function: Stop and hold the load during and after operations to ensure safe handling.
Limit Switches
Installed on various parts of the crane to restrict excessive movement and prevent collisions or over-traveling.
Function: Ensure operational safety by automatically halting crane motions when limits are reached.
Bumpers / Buffers
Located at the ends of end carriages and trolley, buffers absorb shock in case of sudden stops or end collisions.
Function: Reduce mechanical stress and enhance safety.
Epilogue
Understanding the essential components of an EOT Crane helps ensure safe operation, proper maintenance, and improved productivity. Whether you’re planning to install new EOT Cranes or upgrade existing systems, knowing how these cranes work at a component level is crucial. Kito India’s Crane Partners offer advanced, reliable, and custom-engineered EOT Cranes tailored to your industrial needs.