Novel diameter variable steel pipe magnetic flux leakage detection probe

Abstract

The invention belongs to the technical field of nondestructive test, and provides a novel diameter variable steel pipe magnetic flux leakage detection probe. The novel diameter variable steel pipe magnetic flux leakage detection probe is composed of a plurality of detection subunits which are connected through left and right rotating shafts; the front end and the back end of each detection subunitare provided with a walking detection parts respectively; adjacent detection subunits are connected through connectors and arc-shaped plates on the upper parts, and fixing parts on the lower parts, so that the stability of the whole structure is ensured; in each pair of adjacent connectors, one connector is connected with a through hole of the corresponding arc-shaped plate through hinge joint, and the other connector is provided with a fastening screw, and the fastening screw is arranged in a corresponding arc-shaped groove; when basic matching of the detection subunits with a steel pipe external surface is realized, the fastening screws are tightened, so that the detection external diameter of the novel diameter variable steel pipe magnetic flux leakage detection probe is maintained tobe the same in detection process; under different pipe diameters, the circle center deviation of the plurality of detection subunits is low, so that detection result accuracy is ensured; and in addition, the lower part of each detection subunit is connected with the corresponding rotating shaft through the corresponding fixing part, so that the area of the missing detection zone between magnetic bridges in probe diameter changing is reduced.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, and in particular relates to a novel variable-diameter steel tube magnetic flux leakage detection probe. Background technique [0002] The safe operation of large-scale facilities is an issue of widespread concern in society. Steel pipes are widely used in electric power, petroleum, chemical, municipal and other industries. For these infrastructures, regular inspection and evaluation of steel pipes is a necessary measure to ensure their safety. [0003] After years of actual use and mutual verification of multiple detection technologies, the magnetic flux leakage detection technology has been widely accepted. The "NB / T 47013.1-2015 Nondestructive Testing of Pressure Equipment" standard issued by the state clearly lists the magnetic flux leakage testing methods. As a fast non-destructive testing method, magnetic flux leakage testing has its unique advantages. Fast detection spe...

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Problems solved by technology

[0005] In view of the above problems, the purpose of the present invention is to provide a new type of magnetic flux leakage detection probe for variable diameter steel pipes, aiming to solve the problems of poor structural stability of the existing magnetic flux leakage detectors on the outer wall of variable diameter pipes, different centers of subunits, and large missed detection widths. question

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