Extension steel structure for transforming movable pulley of water conservancy culvert gate

The utility model discloses a water conservancy culvert gate movable pulley transformation extension steel structure which comprises a pulley shell, a movable pulley is installed on the inner side of the pulley shell, a steel wire rope is connected to the outer wall of the movable pulley in a sleeved mode, connecting plates are installed on the two sides of the pulley shell, an upper connecting plate is installed at the bottom end of each connecting plate, and a telescopic mechanism is installed at the bottom end of each upper connecting plate. A lower connecting plate is installed at the bottom end of the telescopic mechanism. The telescopic mechanism is arranged and controlled by the PLC, driven by the motor and inducted by the water level sensor to the water level, so that the telescopic mechanism can stretch out and draw back automatically according to the height of the water level, the height of the upper connecting plate is adjusted, and the pulley shell and the movable pulley are kept above the normal