Characteristics of various main girder structures of overhead traveling bridge cranes

With the needs of economic construction and the acceleration of industrialization, top running double girder crane, as important equipment for material production and loading and unloading, are widely used in production workshops, warehouses and other fields. Traditionally designed bridge cranes can meet engineering needs, but they have problems with their heavy weight and material waste. The emergence of modern design methods has optimized the structural design of cranes. How to reduce manufacturing costs and improve market competitiveness while meeting engineering requirements has more practical significance.

The sevencrane top running double girder crane for sale is mainly composed of a bridge frame, a trolley traveling mechanism and a lifting trolley. The box-shaped main girder is the most important part of the overhead crane. Since the box-shaped girder is the main load-bearing part of the crane, its design parameters and Performance has a greater impact on the performance and cost of the crane. However, in the traditional box-shaped beam structural design, although it can meet the engineering requirements, the cross-section of the beam does not match the bending moment it bears. This unreasonable structural design will increase the beam’s self-weight, which will inevitably Resulting in wastage of materials.

According to the structure, the industrial top running double girder crane manufacturers can be divided into steel beam bridge, box structure bridge and truss bridge. The steel beam structure generally uses I-beam or reinforced I-beam as the main beam, and its operating trolley generally uses an electric hoist. The structure is simple and the lifting weight is generally small. Box-shaped structural bridge is a widely used structural type. It has the advantages of simple manufacturing process, convenient assembly, strong versatility, conducive to automatic welding, and good torsional rigidity. The disadvantages are heavy weight, easy deflection of the main beam, poor horizontal stiffness of the bridge, poor internal welding conditions of the box, low service life of the connection welds between the upper flange plate and the web, and poor connection between the upper flange plate and the transverse stiffening plate. Welds are prone to cracking, etc.

With the application of new structures, new processes and modern design methods, these shortcomings are gradually being improved. Truss structures are further divided into triangular truss structures, four-truss structures and open-web truss structures. The manufacturing process of the truss structure is more complicated than that of the box structure, which is time-consuming and difficult to ensure that each component is assembled according to the specified centroid requirements. The welding deformation is large. The advantage is that the windward area is small and the dead weight is lighter. When designing the bridge structure of an heavy duty top running double girder crane price, the following basic requirements must be met: the strength and stiffness of the bridge must be sufficient; the bridge and the large and trolley operating mechanisms must cooperate well to ensure the normal operation of the operating mechanism; the weight of the bridge must be reduced as much as possible, and the bridge must be The reduction of weight has great economic significance; it should be convenient for mass production and the appearance of the bridge should be as beautiful as possible.