portal crane

Single girder gantry ‪crane‬ doors leg has L and C forms. L type of manufacture and installation convenience, the force was better, the smaller their own quality, but, lifting goods through space at the relatively small number of legs,Double girder gantry portal crane carrying capacity, span, the overall stability, variety, but the quality of their starting weight compared with the same single-girder gantry #crane to be bigger, the cost is higher. Depending on the main beam structure, it can be divided into box beams and trusses in two forms