Safety device for vertical ship lift with counter weight

The utility model discloses a safety device for a vertical ship lift with a counter weight. The safety device comprises a group of fixed pulleys and a group of torque winding drums which are installed on a vertical erector, and further comprises a ship chamber which can longitudinally move along the vertical erector. A steel cables is arranged on the fixed pulleys, one end of the steel cable is connected with the ship chamber, and the other end is connected with a gravity weight; a steel cable is arranged on the torque winding drums, one end of the steel cable is connected with the ship chamber, and the other end is connected with a torque weight; the group of the torque winding drums are connected with a motor through a mechanical synchronous device; a safety winding drum is also arranged on the vertical erector; a steel cable is arranged on the safety winding drum, one end of the steel cable is connected with the ship chamber, and the other end is connected with a safety weight; and brakes are arranged on both the torque winding drums and the safety winding drum. The device has the advantages that the construction cost is low, operation control is convenient, the safety is high, the safety problem of complete water losing in any position of the ship chamber is solved, and the operation safety of the ship lift is greatly improved.