The Anatomy of a Double Girder Overhead Travelling Crane: Structure and Components

Double girder overhead travelling cranes are indispensable heavy-duty lifting solutions that find applications in various industries, from manufacturing and construction to logistics and shipping. These cranes are known for their robustness and versatility. In this article, we will explore the structure and key components that make up a double girder overhead travelling crane, shedding light on their design and functionality.

The Structure of a Double Girder Overhead Travelling Crane

Girder Configuration: The defining feature of a double girder overhead travelling crane is its twin girder structure. These girders are typically made of steel and run parallel to each other, providing a stable framework for the crane's operation. The double girder design offers increased load-bearing capacity compared to single girder cranes, making them ideal for heavy lifting applications.

End Carriages: At each end of the double girder structure, you'll find end carriages. These carriages house the wheels that allow the crane to move along the overhead runway. The end carriages are responsible for distributing the load evenly across the runway beams and providing stability during crane movements.

Runway Beams: The double girder overhead travelling cranes are designed to move along a runway system, which consists of horizontal beams or tracks mounted on support structures. The crane's wheels are fitted onto these runway beams, allowing for horizontal movement along the length of the runway.

Hoisting Mechanism: Suspended from the double girders, the hoisting mechanism is responsible for lifting and lowering heavy loads. It typically includes a hoist drum, wire rope or chain, and a lifting hook or other attachment device. The hoist motor provides the power needed to perform vertical lifting operations.

Trolley: The trolley is a critical component that runs horizontally along the double girders. It carries the hoisting mechanism and allows for precise positioning of the load within the crane's working area. Some cranes feature a double trolley design for improved load distribution and stability.

Bridge: The bridge is the part of the crane that spans the gap between the two runway beams. It is attached to the trolley and supports the hoisting mechanism. The bridge allows the crane to travel along the length of the runway, providing extensive coverage of the working area.

Key Components and Features

Control System: Modern double girder overhead travelling cranes are equipped with advanced control systems that enable operators to manage crane movements with precision. These systems often include radio remote controls or cabin-based control panels with intuitive interfaces.

Safety Features: Safety is paramount when operating heavy machinery like double girder overhead travelling cranes. These cranes come with various safety features such as limit switches, overload protection, emergency brakes, and collision avoidance systems to ensure the protection of both personnel and equipment.

Structural Integrity: The structural components of these cranes are built to withstand heavy loads and extended use. They are often coated with protective finishes to prevent corrosion and extend their lifespan.

Customization: Double girder overhead travelling cranes can be customized to meet specific industry needs. This includes the option to incorporate specialized attachments, variable speed controls, and precision positioning systems.

Conclusion

Double girder overhead travelling cranes are engineering marvels that play a crucial role in modern industries. Their robust double girder structure, coupled with advanced control systems and safety features, makes them indispensable for heavy lifting tasks. Understanding the components and design of these cranes is essential for those involved in crane operations, maintenance, and procurement, as it allows for safer and more efficient utilization of this powerful machinery.