Clamp for detecting surface defects of water pump impeller

The utility model relates to the technical field of water pump production and detection, and discloses a water pump impeller surface defect detection clamp which comprises a shell, a groove is formed in the top of the shell, a motor is connected to the bottom of an inner cavity of the shell in a bolted mode, a first gear is fixedly arranged on an output shaft of the motor, a second gear is arranged on the right side of the first gear, and the first gear and the second gear are in threaded connection. The first gear is meshed with a second gear, a rotating rod is arranged in the shell, and the second gear is fixedly arranged on the surface of the rotating rod; the water pump impeller is clamped through the limiting block, so that the water pump impeller is in a stable state in the flaw detection process, detection data of a flaw detector is more accurate, meanwhile, the size of the clamp can be adjusted, the applicability of the clamp is improved, and the problem that the water pump impeller cannot be clamped