Spring Drive for Defectoscope

The paper presents the developed mathematical model of a spring electric drive with a multi-functional ability of the defectoscope, which has increased selectivity and resolution to the technological defects of the controlled product (oil and gas pipelines, their welds). The work of the spring electric drive for defectoscopes (SED) is based on the fact that the resistance to magnetic flux changes when longitudinal and transverse defects appear on the inner and outer surfaces of the product. As a result of this effect, when the SED moves inside the product on the spring winding as a result of changes in the circuit current, a signal appears that determines the location and parameters of the defects. The technical capabilities of this drive - defectoscope allow us to investigate the detected defects at the following metrological parameters: error in measuring the wall thickness of the tube 0.4 mm; minimum length of the defect type “crack” along the axis of the pipe 40 mm; minimum length of the defect type “transverse crack” 1/6 of the circumference, versatility.