Automatic feeding device of forming machine for large corrugated tubes

An automatic feeding device of a forming machine for large corrugated tubes comprises a motor, steering devices, lifters and a tube billet bracket. Power of the motor is transferred to the first lifter via the first steering device and a first connecting shaft, simultaneously, power of the motor is transferred to the second lifter via the first steering device, a driving shaft and the second steering device, the first lifter and the second lifter move synchronously and are respectively connected with a lifting screw rod, and bracket nuts are symmetrically arranged at two ends of the tube billet bracket and matched with the lifting screw rods in a screwed manner. The automatic feeding device utilizes the variable-frequency speed regulating motor as power and realizes feeding and lifting of the tube billet bracket by the aid of the mechanical driving components such as the steering devices, worm gears, worms, the lifters and the like, and action of the variable-frequency speed regulating motor is controlled and actuated by an electrical control element. The automatic feeding device is capable of effectively improving operating efficiency, realizing accurate feeding and improving processing quality of the corrugated tubes while labor intensity of workers is greatly relieved.