What form is best for the main beam of a single-girder crane?
Category: Industry News
Release time:2020-02-13
Many people wonder whether to choose a solid-web main beam or something else when purchasing an overhead crane, especially when it comes to Single-girder bridge crane The form of the crane main beam primarily depends on the lifting capacity and span requirements. Currently, single-girder bridge cranes almost exclusively use solid-plate main beams, and even medium-to-large-scale crane manufacturers typically opt for this type of construction. So, what are the advantages of using solid-plate main beams?
Compared to solid-web main beams, another common approach involves using U-shaped grooves to join the main beams. Typically, 1000mm or 1240mm-long U-grooves are welded together to achieve the desired length. Meanwhile, the height of the U-groove must be carefully determined based on the span of the single-beam crane’s main beam—specifically, the greater the span, the taller the box structure required. In contrast, solid-web main beams, which have gained popularity in recent years, are essentially fabricated by welding three full-length, continuous steel plates into an I-beam shape. This method offers clear advantages in both strength and aesthetic appeal.
Secondly, a full-plate main beam is less prone to deformation. Conventional "I"-shaped single-beam cranes don’t actually remain perfectly horizontal—according to relevant standards for special equipment, their main beams are designed with an upward camber ranging from (1/1000 to 1.4/1000)S. Traditionally, this camber is achieved by heating the beam during the forming process. However, when using a solid plate to create the main beam, the desired camber can be pre-set directly during CNC cutting. This approach offers a significant advantage over the traditional heating method: the resulting crane beam is far more resistant to deformation. In summary, cranes equipped with full-plate main beams outperform those featuring conventional single-beam designs, making them particularly well-suited for applications requiring large spans and heavy lifting capacities. On the other hand, for single-beam cranes that handle lighter loads and shorter spans, the traditional design remains a viable and practical choice.
Keywords: What form is best for the main beam of a single-girder crane?
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