European style crane hoisting mechanism with double protection devices

The European style crane hoisting mechanism with the double protection devices comprises a hoisting motor, a winding drum and a balance beam, the hoisting motor is connected with one side of the winding drum through a coupler and a hollow shaft of a speed reducer, the balance beam is arranged below the winding drum in parallel, and two sides of the balance beam are respectively provided with a group of movable pulleys. Two groups of fixed pulleys are arranged between the balance beam and the winding drum, two ends of the winding drum are respectively provided with a group of steel wire ropes, two fixing parts are arranged in the middle of the balance beam, one end of each steel wire rope is fixed on the winding drum, and the other end of each steel wire rope sequentially bypasses the movable pulley and the fixed pulley on the same side and is fixed on the fixing part on the other side of the balance beam to form a pulley group; a tension sensor is arranged on the fixing part and located between the fixing par