The shipyard portal crane is an erecting crane for shipyards  or large scale factories.  The crane adopts advanced technology with great radius and  fast speed. The crane can carry out luffing with horizontal  displacement or slewing and the hoisting, slewing and luffing  mechanisms can be operated independent or unite.  The cab has a good viewing field and the electric system  employs the marine cable and controller of best quality. The  central slip-ring collector can suit the frequent operation of  shipyards with great capacity and best property.  All mechanisms are equipped with electrical and mechanical  safety protective devices to ensure the safety work of the  crane