Flaring mechanism

The utility model discloses a flaring mechanism which comprises a heating box seat, a connecting seat is fixedly connected to the middle of the side face of the heating box seat, a three-caliber flaring die head assembly is arranged on the side face of the connecting seat, and a three-section distance adjusting hot air heating assembly is fixedly connected to the side face, close to the connecting seat, of the heating box seat. The three-level caliber flaring die head assembly is arranged to serve as a flaring mechanism, so that the three-level caliber flaring die head assembly can directly adapt to pipes with three caliber machining requirements during flaring machining; the length can be adjusted by arranging the three-section distance-adjusting hot air heating assembly, and then the hot air blowing position is adjusted, so that the pipe position machined on the surface of the three-stage-caliber flaring die head assembly is adapted, the machining adaptation range of the flaring mechanism is widened, the ef