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某工厂因生产工艺改变,原来的QD7.5t-16.5m通用桥式起重机已不能满足使用需求,其额定起重量要提高到10t。考虑到经济效益,优先采用改造方案。其中小车是必须重做的,如果起重机的桥架能够满足强度要求,那就可以节省一笔可观的费用。该起重机桥架结构为中轨箱形,内部设置有纵向长加筋板,主梁内部还设置有纵向短加筋板。主梁是
A factory due to changes in production technology, the original QD7.5t-16.5m Universal Bridge Crane can not meet the needs of use, the rated lifting capacity should be increased to 10t. Taking into account the economic benefits, give priority to the transformation program. Which car must be redone, if the crane’s bridge to meet the strength requirements, it can save a considerable cost. The crane bridge structure is a middle rail box shape, a long longitudinal stiffener plate is arranged inside, and a short longitudinal stiffener plate is also arranged inside the main beam. The main beam is