Chain bucket ship unloader

The utility model relates to the technical field of port equipment, in particular to a chain bucket ship unloader, which comprises a portal frame main body, a travelling trolley, a material taking device, a power structure and an adjustable counterweight device, and the portal frame main body comprises a portal leg and an arm frame capable of moving up and down along the portal leg; the travelling trolley is movably connected to the arm frame; the material taking device is connected with the running trolley; the power structure is fixedly connected to the portal frame body, and the power structure and the running trolley are arranged at intervals. The power structure comprises a power output end capable of reciprocating up and down; the adjustable balance weight device comprises a balance weight block, a pulley structure and a balance weight connecting rope, the balance weight block is connected with the power output end, the pulley structure is connected to the portal frame body, one end of the balance weigh