Heavy-duty material handling and lifting operations use a form of lifting equipment called a double girder overhead crane, often referred to as a double girder bridge crane, in many different industries. When compared to single girder cranes, their design features two parallel girders that support the trolley and hoist, increasing lifting capacity and stability.
1. Double Girder: The crane's bridge is made up of two parallel horizontal beams, or girders, that run across it. The trolley and hoist are supported structurally by the girders, which are normally composed of steel. The lifting capacity, span, and application requirements will determine the size and shape of the girders.
2. Runway System: Installed on raised beams or columns are parallel rails that make up the runway system. A tram system that travels along the rails is used to transport the double girder crane along the runway. The layout and coverage area required for the lifting operations determines the runway's length and configuration.
3. Trolley System: The hoist is transported along the bridge girders by a device called a trolley. It enables the load to move horizontally within the working space. Typically, a control pendant or wireless remote control is used to drive the tram.
4. Hoist: The hoisting device attached to the trolley is known as a hoist. It is in charge of adjusting the load up and down. The hoist may employ a wire rope or chain to lift and lower the load and may be electrically driven. The hoist's lifting capacity, speed, and characteristics are determined by the particular needs of the application.
5. Controls: In order to allow operators to control the movement of the crane and the operation of the hoist, double girder cranes are frequently fitted with control pendants or wireless remote controls. For improved control and automation, advanced features like variable frequency drives (VFDs) and programmable logic controllers (PLCs) may also be included.
Double girder overhead cranes are frequently used in manufacturing, steel mills, power plants, and facilities that maintain large pieces of machinery. They offer greater lifting capacity compared to single girder cranes and are appropriate for handling heavier loads.
When choosing a double girder overhead crane, it's crucial to take into account aspects like lifting capability, span, duty cycle, and unique application needs. The best crane for a certain lifting operation can be chosen with the assistance of a manufacturer or supplier of cranes.