Transverse wave mode electromagnetic ultrasonic spiral guided wave transducer for detecting interior of pipeline

Abstract

The invention belongs to the technical field of ultrasonic detecting in nondestructive detecting and relates to a transverse wave mode electromagnetic ultrasonic spiral guided wave transducer for detecting the interior of a pipeline. The transducer comprises a protective shell, a holding structure, travelling and supporting structures, permanent magnets, a coil and a yoke and is characterized in that the protective shell is in an arch shape; the travelling and supporting structures are connected to the planes of the two sides of the protective shell; the holding structure is connected on the other side of the travelling and supporting structure on one side; a containing groove is formed in the upper side of the outer arc surface of the protective shell; the yoke is connected in the containing groove; the two permanent magnets are connected with the upper end face of the yoke; the upper end faces of the permanent magnets are arc-shaped surfaces; the coil is connected between the two permanent magnets; and magnetisms of the arc-shaped surfaces of the two permanent magnets are opposite. According to the transducer, electromagnetic ultrasonic guided waves propagated in the different directions of the pipeline can be produced, and thus generation of the spiral guided waves in any direction of the pipeline and detecting of pipeline defects in any direction are achieved.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic testing in nondestructive testing, and relates to a helical guided wave transducer for detecting in a transverse wave mode electromagnetic ultrasonic pipeline, in particular to a helical guided wave transducer for detecting in a transverse wave mode electromagnetic ultrasonic pipeline used in nondestructive testing of pipelines device. Background technique [0002] There are many types and quantities of metal pipes, and they are widely used. Applied in such as electric power station, petrochemical, petroleum, chemical industry, machinery industry, long-distance oil and gas, water supply project, cross-sea bridge, pier bridge pile water supply, drainage, heat supply, gas supply, agricultural irrigation, hydraulic engineering and various industrial devices middle. The non-destructive testing of pipelines plays an important role in the safety evaluation and repair of its use. Electromagnetic ul...

AI Technical Summary

Problems solved by technology

[0004] The defects of metal pipelines generally have multi-directional defects in the circumferential, longitudinal and oblique directions. However, the traditional electromagnetic ultrasonic transducer can only generate a single longitudinal guided wave or circumferential guided wave, which cannot meet the actual needs of electromagnetic ultrasonic pipeline inspection.

Images