Detailed introduction to Portal crane:

The use of steel plate welded into a box type structure, and has the higher safety, stiffness of the characteristics. Generally used for large tonnage and large tonnage gantry crane. As shown in figure MGhz1200, weight1200 tons, is China's largest portal crane, main girder with box girder structure. Box beam also has high cost, since the major wind resistance, its poor.

1average Longmen crane
Track gantry crane
This kind of crane with box type and truss structure, the most extensive use. Can carry a variety of items and bulk materials into, from the weight of 100 tons, a span of 4 to39 meters. With a grab of ordinary high-level gantry crane. General gantry crane is mainly refers to the hook, grab, electromagnetic, hoist gantry crane, and also includes a gantry crane