Cutter suction dredger's operating system

The utility model relates to a cutter suction dredger's operating system, including winch, portal frame, gallows and crane span structure, bridge connection is in the gallows lower extreme is fixed onthe portal frame and is provided with the standing block, still is provided with on the portal frame to swing the assembly pulley by the wobbling, and fixed being provided with running block on the gallows, the pulley in standing block, swing assembly pulley and the running block links together through rope drive, and the first end connection of rope is on the portal frame, and the connection ofthe second of rope end is on the winch to under the pulling effect of winch to the rope, drive the gallows and carry out the elevating movement. This cutter suction dredger's operating system can increase a crane span structure liter weight of system through the pulley number that changes in standing block, swing assembly pulley and the running block, and then satisfies the needs that crane span structure lift gravity incr