Design of special pipeline helix angle measurement system based on orifice suspended guide rail

Due to the narrow space of small-diameter special pipelines, it is difficult to design and process the small measurement system in the inner space of special pipelines. This paper proposes a method to design an annular light panoramic view probe to obtain the inner bore image. By automatically tracking the rotation of the helix, the rotation angle of the helix is determined by the image, and the corresponding axial distance is measured by the rope displacement sensor. A suspension guide rail is also designed to solve the problem of the rotation of the glint probe in the special pipeline, so the measurement error of the rifling rotation angle caused by the rotation of the glint probe is eliminated. Through actual measurement, the measurement accuracy of the helix angle is less than 1′, which significantly improves the measurement accuracy of the helix angle of the special pipeline.