What are the forms of support legs for gantry cranes

What are the forms of support legs for gantry cranes

The supporting leg forms of gantry cranes are diverse and can be classified according to configuration, nature, and type. The following is the relevant content compiled by the editor:

Classified by leg configuration

Single leg: A single leg gantry crane is called a semi gantry crane, and the large vehicle walking mechanism on the side without legs runs along the dedicated tracks or specially designed elevated bridge tracks for cranes in factories, warehouses, etc.

Double leg: This is a common configuration form of gantry cranes, with legs on both sides to provide stable support.

Tall and Short Legs: Specially designed to meet terrain requirements, when there is a significant difference in leg pressure between the two side legs of a gantry crane and different levels of operating trolleys are required, the high and short leg scheme can also be used.

Classified by leg properties

Space rigid support leg: It has good spatial rigidity and can withstand both horizontal loads in the support leg plane (horizontal load of the crane) and horizontal loads in the gantry plane (longitudinal horizontal load of the crane).

Flat flexible support legs: The rigidity within the frame plane (perpendicular to the support leg plane) is poor, so it can only withstand horizontal loads within the support leg plane. Large span gantry cranes often use a combination of a rigid leg and a flexible leg to prevent rail jamming caused by temperature changes.

Classified by leg type

Box shaped open leg: including L-shaped, C-shaped, O-shaped, and U-shaped. L-shaped and C-shaped legs are mainly used for single main beam gantry cranes. The L-shaped structure is easy to manufacture and install, with good stress conditions and light weight, but the space for lifting goods through the legs is relatively small; The C-shaped support legs are designed in an inclined or curved shape to provide ample horizontal space for goods to pass through smoothly. O-shaped and U-shaped legs are mainly used for double beam gantry cranes, among which U-shaped legs are widely used in tire type container gantry cranes.

Solid belly closed leg and box shaped closed leg: subdivided according to whether there is a small car passage. Closed legs with a small car passage facilitate the operation and maintenance of the car, while closed legs without a small car passage have a more compact structure.