Adjustable traction device

The utility model discloses an adjustable tow attachment which comprises a pulley, a wire rope and an oil cylinder tension device; wherein, the wire rope winds with the pulley and is connected with the oil cylinder tension device. The tow attachment also comprises a sliding tension device. The pulley is arranged at one end of the sliding tension device. The utility model has the advantages of simple structure, convenient installation and safe and reliable use and may be used in the operations of shore bridge cranes. When the oil cylinder tension device fails, the utility model may adjust and make the wire rope tight by changing the position of the pulley so as to release the operations of the shore bridge cranes from being affected, thereby realizing the combination of the operation and safety protection of the tow system of the shore bridge cranes, enhancing the work efficiency and simultaneously avoiding the economic losses caused by the shutdowns of the shore bridge cranes.