Variable diameter inspection device

The invention belongs to the field of aircraft assembly detection, and particularly relates to a variable diameter inspection device. The variable diameter inspection device comprises a propelling device, a fine adjusting device, a shell and a guide ring, wherein the fine adjusting device and the propelling device are positioned in the shell; the propelling device can move up and down in the shell; the fine adjusting device is located on the propelling device; a working block is located in the middle of the shell; and the guide ring is arranged at the bottom of the shell. A universal device isused for replacing a series of special pins, so that the pore diameter detection can be rapidly completed; and meanwhile, the device is more convenient and effective to use in a multi-hole deviationmeasurement process, so that the inspection precision is improved, and the manufacturing cost and the management cost are reduced. The measuring and reading of different pore diameters and positioninghole deviations can be rap