Novel rotary positioning welding tool for pump impeller

The utility model discloses a novel pump impeller rotary positioning welding tool which comprises a lower connecting plate and a positioning mandrel installed in the center inside the lower connecting plate, a lower positioning plate is installed at the upper end of the lower connecting plate, the lower positioning plate is sleeved outside the positioning mandrel, an inlet positioning block is installed inside the lower positioning plate, and an outlet positioning block is installed inside the inlet positioning block. A lower supporting plate is installed on the outer wall of the lower positioning plate, the lower supporting plate and the lower connecting plate are fixed through bolts, an annular groove is formed in the inner side of the lower supporting plate, a gear transmission plate is rotationally arranged on the annular groove, a guide plate is fixed to the upper end of the lower supporting plate through bolts, and an upper clamping plate is fixed to the top of the guide plate through bolts; and an impe