Bolt screw pitch measuring device and measuring method based on laser displacement sensor

The invention provides a bolt screw pitch measuring device and measuring method based on a laser displacement sensor. The measuring method provided by the invention comprises the steps of: firstly, collecting contour information of a bolt to be measured by using the laser displacement sensor to form a data point set; then, setting a threshold, and screening data points meeting requirements in thedata point set to form a new data point set; extracting wave crests by using a wave crest extraction algorithm, and calculating the distance between the adjacent wave crests; and finally obtaining a screw pitch according to the distance between the adjacent wave crests. The measurement mode of the measuring method provided by the invention is simple and efficient. Moreover, in the measuring methodprovided by the invention, a data point curve is formed by the new data point set, and segmented fitting is performed on the data point curve, so that the measurement accuracy of the measuring methodprovided by the invention