Pipe end auxiliary centering device for pipeline installation

The utility model relates to the technical field of pipe end centering auxiliary equipment, in particular to a pipe end centering auxiliary device for pipeline installation. The manual operation amount can be reduced, the centering welding efficiency of the straight pipe and the concentric reducing pipe is improved, and the use is convenient; comprising two sets of arc-shaped inserting plates, a rotating shaft, a threaded sleeve, a first sleeve, two sets of V-shaped hinge rods, two sets of supporting rods, a second sleeve, a threaded pushing cylinder and two sets of supporting ejector rods, a first thread is arranged on the right portion of the rotating shaft, and the threaded sleeve is arranged on the first thread of the right portion of the rotating shaft in a sleeving mode; the threaded casing pipe, the first sleeve and the two arc-shaped inserting plates are movably connected through the two V-shaped hinge rods, the right portions of the two supporting rods are rotationally arranged on the left portions o