Method and device for detecting diameter of grinding rod

The invention relates to a device and a device for detecting the diameter of a grinding rod; the length of measurement beams emitted by a signal generator is L in the vertical direction; the projected length of the non-shielded beams at the upper part of the grinding rod is L1, and the projected length is received by a signal receiver; the received projected length of the non-shielded beams at the lower part of the grinding rod is L2; and the diameter value of the grinding rod is calculated according to a formula. The invention further provides a device for detecting the diameter of the grinding rod; and the device is used for implementing the method for detecting the diameter of the grinding rod; and the device consists of correlation measuring heads with data cables. In the measuring process of the grinding rod, the grinding rod is not damaged, so that the grinding rod can provide precision guarantee to process precise axial parts by using the grinding rod; the diameter tolerance of the grinding rod is quickly and accurately measured by computer monitoring, thereby providing a scientific detection method for controlling the production quality index of the grinding rod strictly.