起重机是我厂的主导产品之一,单主梁吊钩门式起重机的主梁是几十米长的箱形梁(图1),重二、三十吨,隔板、腹板、盖板间的角焊缝都需焊接.为使焊缝成形美观和便于焊工施焊,焊接过程需翻转箱形梁,在车间起重设备难以满足起吊翻转的情况下,我们设计制作了长箱形梁的翻转工装(图2). Crane is one of the leading products in our factory. The main girder of the single main girder hook gantry crane is several tens of meters long box girder (Figure 1), weighing two or thirty tons, partition board, web board and cover board Between the fillet welds are required to be welded in order to weld the appearance of aesthetics and facilitate welder welding, the welding process to be inverted box girder, lifting equipment in the workshop difficult to meet the case of lifting the flip, we designed a long box beam Flip tooling (Figure 2).