Small-diameter semicircle size detection tool for axially split pump

The utility model discloses a small-diameter semicircle size detection tool for an axially split pump, which relates to the technical field of measuring tools, aims to solve the problem of eccentricity detection of an axially split hole, and comprises a straight fluted plate, a central rod is fixedly connected to the middle of the inside of the straight fluted plate, the lower end of the central rod penetrates through the straight fluted plate, and the lower end of the central rod is fixedly connected with the straight fluted plate. The two ends in the straight groove plate are connected with lead screws through bearings correspondingly. The center rod and the pair of detection rods extend into a to-be-detected hole, the position of the straight groove plate is adjusted, the center rod is located at the position of a center shaft with the original hole diameter, the rotating disc is rotated, the rotating disc drives the pair of detection rods to slide in the direction away from each other, if the outer sides