Three-jaw tool for twisting narrow-side head of pressure container

The utility model relates to a three-jaw tool for twisting a narrow-side head of a pressure container, and belongs to the field of part assembly. The twisting tool comprises lead rods, lead frames, screws, lead blocks and a support barrel, wherein the three lead frames are uniformly distributed and fixed on the same circumference of the support barrel; the open ends of the three lead frames are inward; inner cavities of the lead frames are communicated with an inner cavity of the support barrel; the lead blocks are placed into the inner cavities of the lead frames; the ends of the lead blocks, which are provided with arc surfaces, are downward; the lead rods pass through threaded holes of the lead frames; lead block connectors of the lead rods are inserted into lead rod connecting holes in the outer ends of the lead blocks; the screws are inserted into axial locking holes of the lead locks, and the front ends of the screws are inserted into annular locking grooves of the lead block connectors of the lead rods