Magnetic leakage corrosion track detector for inner wall of pipeline

Abstract

The invention discloses a magnetic leakage corrosion track detector for the inner wall of a pipeline, comprising a battery section, a computer section, a magnetic leakage detection probe section, a location section and an odometer wheel section. The detector is technically characterized in that the magnetic leakage detection probe section comprises an axial magnetic leakage section skeleton with mounting flanges at two ends, a probe bracket is evenly distributed in circumferential direction between the mounting flanges at two ends, and an integrated probe is arranged in the probe bracket; the integrated probe structurally comprises two probes arranged in parallel, each probe is formed by that two sides of the upper part of a strip-shaped yoke are respectively provided with a pair of magnets with opposite polarity, each magnet is orderly provided with an iron liner, a wear-resistant body and a stainless steel substrate spray-welding tungsten carbide hard coating upwards, a sensor box is arranged at the upper middle part of each strip-shaped yoke, and a sensor is cast in each sensor box; the odometer wheel section is of a self-coupling swinging arm type odometer wheel structure, through holes are evenly distributed in circumferential direction of an odometer wheel, an inductive transducer is mounted on a rotating arm, and the induction end of the inductive transducer straightly faces towards the circumferential through holes of the odometer wheel. The structure is particularly suitable for a magnetic leakage detector of a DN219 small-diameter pipeline.

Description

technical field [0001] The invention belongs to the technical field of pipeline detection, in particular to a pipeline inner wall magnetic flux leakage corrosion diameter detector mainly used for long-distance pipelines. Background technique [0002] Pipeline transportation capacity represents a country's industrial development level. Domestic pipeline laying is currently developing at a rate of 10,000 to 20,000 kilometers per year. By 2015, the total length of my country's oil and gas pipelines will reach 140,000 kilometers. [0003] Oil and gas pipelines are oil and gas transmission facilities, and their safety performance is very important. Long-term operation of oil and gas pipelines will cause failure due to corrosion, mechanical damage, geological damage, and pipe defects. In severe cases, it will cause fire, explosion, and poisoning, affecting the surrounding environment and the lives of the people. At the same time, it will cause a great waste of energy transmission....

AI Technical Summary

Problems solved by technology

[0008] The traditional mileage wheel joint adopts the method of uniformly distributing three mileage wheels in the circumferential direction. The reason for arranging three mileage wheels is that the detector travels in the pipeline at a speed of 0.5 m / s to 5 m / s, and is affected by the flow fluctuation of the medium, and The ups and downs of the pipeline make it difficult to control the speed, so the mileage wheel will cause slippage, resulting in counting errors. In order to eliminate this error, three mileage wheels are installed, and the average value of the three mileage wheel rotations is used as the expected value

However, in the DN219 pipeline, due to the narrow space, if the method of arranging three mileage wheels in the circumferential direction is still adopted, the diameter of the mileage wheel must be reduced. The smaller the diameter of the mileage wheel, the more obvious the slipping phenomenon, resulting in a significant increase in the counting error

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