Automatic bending machine for hinge of lower side door of truck and gondola car

The utility model belongs to the technical field of mechanical equipment, and discloses an automatic bending machine for a hinge of a lower side door of a truck open wagon, which comprises a rack, a motor arranged below the rack, a speed reducer connected with the motor through a torsion connector, and a driving turntable connected with an output shaft of the speed reducer through a positioning shaft, a round corner folding block is fixed to the driving rotary disc, the positioning shaft protrudes out of the driving rotary disc, the distance between the positioning shaft and the round corner folding block is equal to the thickness of a workpiece to be folded, a material supporting frame is arranged on one side of the table top of the rack, and the material supporting frame is perpendicular to the extension line of the round corner folding block. According to the automatic bending machine, manual rotation operation can be replaced, one-time automatic circle forming of the hinge of the lower side door of the tr