More than half gantry crane with box type and truss structure

Semi gantry cranes  is between an overhead crane and gantry crane between semi gantry cranes have only one leg crane bridge crane as the other end as the plant crane beam frame, frame orbit on a plant commonly known as day orbit, the orbit on the ground, said ground rail. Semi-gantry crane hoisting mechanism, trolley traveling mechanism and bridge construction, and bridge crane basically the same. Since the span, crane operating agencies they use are driven way to prevent the crane operation produce skew increases resistance, even accidents, in order to prevent falling or tipping lines in strong winds, wind measurements and is equipped with interlock operating agencies Crane rail clamp. 

 Semi-gantry crane electric hoist normally, so the rated capacity is usually 16 tons or less.Portal crane Use of box type and truss structure, the most widely used. You can carry a variety of bulk materials into items and, from the weight of 100 tons, a span of 4 to 39 meters. Grab common with the work of a higher level gantry crane. Common gantry crane mainly refers hook, grab, electromagnetic, hoist gantry crane, but also includes semi-gantry cranes.