QL double girder overhead crane is composed with Girder frame, Crane travel device, and the trolley with lifting and moving device. There are Pave the rail for the trolley moves on the main girder. The main girder joint with the two sides end carriage which with the joint point in the middle. Product name:QL model double girder overhead crane with rotating elecromagnetic hanging beam Working load: 5+5t-30+30t span:7.5-31.5m lifting height:3-30m