Introduction

Double girder overhead cranes, as important material handling equipment, play a critical role in modern industrial lifting operations. These cranes are designed with robustness, versatility, and efficiency at their core, providing a dependable solution for heavy lifting tasks across various sectors. Their distinctive construction comprises two parallel box-type girders forming the main bridge section which is mounted on end trucks, allowing for smooth and precise traversing along the runway beam.

Structure of a Double Girder Overhead Crane

A typical double girder overhead crane consists of several key components:

Main Girders: The primary structural elements are two box girders made from high-strength steel, engineered to support substantial loads without deformation. These girders span the entire width of the work area and carry the hoist mechanism and trolley.

End Trucks: Located at either end of the main girders, the end trucks house wheels that run on the runway rails. They provide the crane's mobility in a longitudinal direction and ensure stability during operation.

Hoist and Trolley System: Suspended between the main girders, the hoist unit is typically equipped with wire rope or chain mechanisms capable of lifting and lowering heavy payloads. The trolley facilitates cross-travel movement perpendicular to the main girder direction.

Electrical Systems: Modern double girder cranes are powered by advanced electrical systems that control speed, direction, and safety features such as limit switches, overload protection devices, and variable frequency drives for smooth start and stop actions.

Control Systems: Remote pendant control or cabin-based control allow precise control over crane movements, ensuring safe and efficient operation.