Laminated steel pipe magnet yoke type uniform magnetization device

Abstract

The invention belongs to the technical field of steel pipe magnetic flux leakage detection, and discloses a laminated steel pipe magnet yoke type uniform magnetization device, which comprises a coil, an iron core and a laminated magnet yoke, the coil is uniformly wound on the outer side of the iron core, two ends of the coil are connected with a power line, the lower end of the laminated magnet yoke abutted against the surface of a steel pipe is arc-shaped, and the diameter of the arc is greater than the outer diameter of the steel pipe. Each laminated magnet yoke is formed by connecting five steel plates, the steel plates on the front side and the rear side are arranged in mirror symmetry about the middle steel plate, the number of the laminated magnet yokes is two, the distances between the corresponding steel plates of the two laminated magnet yokes are d1, d2, d3, d4 and d5 respectively, and d1 is equal to d5lt; d2 is equal to d4lt; d3, two laminated magnet yokes are fixedly connected to the left end and the right end of the iron core in a mirror symmetry mode, the two laminated magnet yokes are also in mirror symmetry about the coil, and the coil is arranged between the two laminated magnet yokes; the problem of nonuniform magnetization of the steel pipe in the prior art is solved, the consistency of defect magnetic flux leakage detection signals is improved, and the method is suitable for magnetic flux leakage detection of the steel pipe.

Description

technical field [0001] The invention relates to the technical field of magnetic flux leakage detection of steel pipes, in particular to a laminated steel pipe yoke type uniform magnetization device. Background technique [0002] As an important transportation and support material, steel pipes are widely used in industrial production and infrastructure construction. With the rapid development of industrial modernization, the demand for high-quality steel pipes is increasing. At present, my country has the world's most advanced steel pipe production technology and the latest pipe rolling unit, and the pace of steel pipe production is getting faster and faster. Steel pipes must undergo 100% quality inspection before leaving the factory. As an efficient detection method, magnetic flux leakage detection can effectively detect internal and external defects of steel pipes, and has low requirements on the surface of the test piece and does not require couplant. It has been widely u...

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Problems solved by technology

[0005] The present invention intends to provide a laminated steel pipe yoke type uniform magnetization device to solve the inconsistency of the magnetization intensity of the inspected area of ​​the steel pipe in the prior art, and the magnetization at the central position The intensity is the highest. From the center to the edge, the magnetization gradually decreases, resulting in different detection positions and inconsistent detection signals, which increases the technical difficulty of defect quantitative evaluation.

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