Bearing internal diameter automatic measuring apparatus

The utility model which relates to an automatic measuring instrument of a bearing diameter used in the automatic inspection of the size of the bearing industry diameter and the geometric accuracy belongs to a technology field of a machinery detection device. The utility model mainly adopts that a direction guiding axis is fixed at a beam which moves up and down along the direction guiding axis, and a serial connection cylinder is fixed at the beam, and a pneumatic probe is inserted in a probe frame hole, and a spring frame is fixed at the beam, and the pneumatic probe is pressed at the beam through a compressed spring and an upper end of an internal hole of the spring frame. The utility model which is reasonable and compact in structure can increase the accuracy of processed parts; two to five parts can be measured in one beat at the same time on an automation machine, and the production efficiency can be greatly increased, and the aim of saving manual detection can be reached.