Automatic welding equipment for air pipe

The utility model discloses an air pipe automatic welding device which comprises a frame, supporting mechanisms are fixedly connected to the two sides of the middle of the inner lower end of the frame, and a welding mechanism is arranged on the front side of the frame. Rotary fixing mechanisms are arranged in the middles of the two sides of the frame correspondingly, each rotary fixing mechanism comprises a mounting base fixedly connected to the middle of the lower end of the corresponding inner side of the frame, the driving ends of gear motors are fixedly connected with first belt wheels correspondingly, and the first belt wheels are connected with second belt wheels through transmission belts correspondingly; electric telescopic rods are evenly distributed on the peripheries of the ends, close to each other, of the limiting sliding rods, and the driving ends of the ends, away from the limiting sliding rods, of the electric telescopic rods are fixedly connected with limiting blocks. According to the automat