Prevent winding hull of screw

The utility model belongs to the technical field of hull mechanical manufacturing technology and specifically relates to a prevent winding hull of screw, is equipped with the hull, and the bottom of hull is equipped with ship stern pipe, is equipped with the transmission shaft in the ship stern pipe, and the one end of transmission shaft is connected with hull driving system in stretching into ship stern pipe, and the other end of transmission shaft stretches out ship stern pipe and is connected with axle sleeve in the middle part of the screw, its characterized in that propeller shaft sheathein and be equipped with the bar cutting knife, ship stern pipe side be equipped with the annular groove, the one end of bar cutting knife is overlapped with propeller shaft and is connected, the other end of bar cutting knife is equipped with the slider, the slider stretch into the annular groove in, it is rotatory along the annular groove to drive the bar cutting knife through propeller shaft cover rotatory, and then th