Axial crack defect internal detector for pipe wall based on magnetostrictive effect

Abstract

The invention discloses an axial crack defect internal detector for pipe wall based on the magnetostrictive effect. The axial crack defect internal detector runs forward under the driving of media in a pipeline, and detects axial crack defects of the pipe wall during the running process. The internal detector comprises an electric sealed cabin, a plurality of ultrasonic sensors based on magnetostrictive effect and a driver, wherein the electric sealed cabin is internally provided with a data collecting part, a signal processing part and a data storage part; two ends of the electric sealed cabin are respectively provided with a set of support wheels which are ranked circumferentially; the plurality of ultrasonic sensors based on the magnetostrictive effect are connected out of the electric sealed cabin in a circumferential arrangement mode, and are tightly close to the inner wall of a pipeline; each ultrasonic sensor comprises a permanent magnet, an ultrasonic coil and a spring support; the ultrasonic coil is positioned between the pole N and pole S of the permanent magnet; the spring support is connected between the permanent magnet and the ultrasonic coil; the driver is connected with the electric sealed cabin through a universal joint; and two ends of the driver are respectively provided with a set of support wheels which are arranged circumferentially, and a plurality of staggered mileage wheels are arranged one set of the two sets of support wheels which are arranged circumferentially.

Description

Technical field [0001] The present invention relates to the technical field of non-destructive testing, in particular to a device for detecting axial crack defects in the pipe wall based on the magnetostrictive effect that can be applied to long-distance pipelines. Background technique [0002] With the rapid development of the long-distance pipeline transportation industry, the demand for natural gas has exploded, and the high-pressure and large-displacement natural gas pipeline transportation system is becoming increasingly large. Especially since the first line of West-East Gas Pipeline used X70 pipeline steel, high-grade pipeline materials have been gradually promoted and steel grades have been continuously enhanced. With the continuous increase of pipeline operation time, local defects on the pipeline continue to increase and deteriorate, which brings great challenges to the safe operation of high-pressure and large-displacement gas pipelines, especially because the stress c...

AI Technical Summary

Problems solved by technology

However, this technology cannot detect elongated crack-like defects on the pipe body, especially axial crack defects

However, the conventional piezoelectric ultrasonic detection method has many inconveniences due to the need for coupling agents.

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