When choosing an overhead crane, the first thing to consider is the load. You will need to determine a maximum girder load, which should be higher than the weight of the load. A crane girder is subjected to vertical and horizontal loads, which are dynamic and generate vibration.
The vertical load is resisted by the entire beam and the lateral load is resisted by the compression flange. A double beam crane is capable of carrying a disproportionately large load. A crane girder is designed to carry a load, with the lateral load placed at the point of minimum hook approach. To calculate the maximum reaction of the crane girder, the weight of each wheel is multiplied by 25 percent.
Heavy duty
A double girder overhead crane is the beginning of a series of exceptionally heavy-duty cranes. The components of these cranes are primarily comprised of a gantry frame, hoist trolley, and girders or beams that run parallel to the ground. These cranes are commonly used for general material handling and lifting work, and can be designed to incorporate special lifting devices. They can be custom-designed to meet specific needs, and offer work class A6 and high work classes.
A heavy-duty crane usually features a double-girder structure that can lift up to 450 tons. Their sturdy structure, high durability, and excellent safety make them a great choice for warehouses, heavy workshops, and other heavy-duty applications. These cranes also provide convenient bridge-mounted service platforms, which make it possible for technicians to access all parts of the hoist and crane. A single-girder crane, on the other hand, does not allow for a bridge-mounted service platform. The 50 ton overhead crane and 100 ton overhead crane can be your choices.
Special applications
When a double girder overhead crane is used to lift heavy loads, it is more complex than a single girder model. The components are heavier and have more support columns to help the crane stay level. These cranes are common in ports and steel production facilities, but they are also commonly used in other industrial settings. The advantages of double girder overhead cranes make them highly beneficial in the construction industry. The single beam bridge crane also has various applications.
These cranes have two hooks, the main hook is used to lift heavy objects, while the auxiliary hook is used for lighter objects. The auxiliary hook can assist the main hook in tipping the workpiece or turning it over, if needed. Both hooks should never lift the same object, and the weight of the object cannot exceed the capacity of the main hook. The double girder overhead crane is available with an under running hook for maximum headroom and side approach capabilities.
Higher duty class
A double girder overhead crane has three different classes of service, each of which is described by its capacity. The light-duty class, also known as a light-service crane, is used for light warehousing or repairs. This type of crane has a capacity of two to five lifts per hour. In contrast, a heavy-duty class crane is used for industrial facilities such as power houses, transformer stations, and machine shops, where the equipment is constantly at 50 percent of its capacity. The heaviest-duty class is used in cement mills, scrap yards, and other industries that require a crane with a capacity of 20 or more lifts per hour.
A double girder overhead crane has a higher capacity than an underhung crane and is capable of moving objects and loads up to 20 tons. It features radio and pendant controls to ensure safe operation. Double girder overhead cranes can handle heavy objects, and are typically used in manufacturing plants. The working class of a double girder crane is generally A4 or A7. They have a range of capacities from five to 550 tons, and are able to accommodate a variety of working conditions.
Cost
If you need a large span or high capacity overhead crane, you may be interested in a double girder design. This type of overhead crane is made with two beams, one at each end, which provides strength and stability. The most expensive type of double girder is the rigid welded steel box girder, which requires significant increases in material and labor charges. In addition, double girders require special fabrication and are generally more costly. This type of crane is suited for heavy industrial applications such as aerospace, mining, and steel fabrication. It can also be used in clean room applications such as nuclear reactors.
The average price of a double girder overhead crane is $29,000 and up. These cranes are commonly used in warehouses, storage facilities, workshops, and power stations. Some types of double girder overhead cranes have a duty cycle rating of 600 tons, while others are designed for specific tasks. The cost of a double girder overhead crane depends on the specifications of your project. You should know that double girder cranes have longer spans than single girder cranes, and can move loads over greater distances. Some good crane suppliers will help you choose reliable overhead crane.