Single jib portal crane generally includes the following units: steel frame, lift mechanism, slew mechanism, crane travel mechanism, spreader device (grab, container spreader,magnet and hook),electrical equipment and the other accessory equipments for safety. Steel structures include jib and A-frame, slew platform and gantry frame. Single jib portal crane is extensively applied to dock's bulk cargo (coal,ore and so on)and the other cargo ship (lorry) loading/unloading as well as slipway repair.
Referenced standards: GB17495-1998 Harbor portal crane technical specifications,JT400-1999 harbor portal crane safety specification,GB3811 2008 crane design standards, GB6067-85 crane safety specification,ISO standards, FEM standards and JIS standards.