Air coupled magnetic field testing device of magnetic flux leakage detector for oil and gas pipelines and testing method

Abstract

The invention relates to an air coupled magnetic field testing device of a magnetic flux leakage detector for oil and gas pipelines and a testing method, which can provide foundation data for optimizing the design of a magnetic field of a magnetic flux leakage detector and improving the signal-to-noise ratio of defect and magnetic flux signals. The technical scheme includes that a horizontal guide groove is connected with a vertical guide groove by a screw, mounted in a U-shaped groove of a magnetic-permeable iron core of the magnetic flux leakage detector and locked by a locking screw, a push rod is connected with a slider by a connecting rod and mounted on the horizontal guide groove, the slider is mounted in the vertical guide groove and locked by a locking screw, Hall magnetic field sensors a and b are respectively mounted at the inner end of the slider so that magnetic field induction surfaces of the Hall magnetic field sensors are positioned in a horizontal direction and a vertical direction, and the distance from each Hall magnetic field sensor to the top end of the slider is 1 millimeter. By the aid of the air coupled magnetic field testing device, the intensity and the distribution of an air coupled magnetic field of the magnetic flux leakage detector for oil and gas pipelines can be effectively tested, valid data of magnetic field for improving the signal-to-noise ratio of the defect and magnetic flux leakage detector for oil and gas pipelines can be provided, and the air coupled magnetic field testing device is simple in structure and accurate in testing and is used for testing air coupled magnetic fields in defect and magnetic flux leakage detectors for oil and gas pipelines.

Description

technical field [0001] The invention relates to an air-coupled magnetic field test device and a test method for an oil-gas pipeline magnetic flux leakage detector used for the air-coupled magnetic field test in the magnetic flux leakage detection of oil and gas pipeline defects, and belongs to the field of magnetic flux leakage nondestructive testing. Background technique [0002] At present, most oil and gas pipelines in my country have entered the stage of frequent accidents. In order to prevent perforation, leakage, pipe burst and other malignant accidents caused by corrosion defects, non-destructive testing must be carried out on the internal and external defects of the pipeline. Magnetic flux leakage detector has become the main method for defect detection of in-service oil and gas pipelines due to its unique advantages of strong online defect detection ability and high degree of automation. [0003] When the magnetic flux leakage detector detects, it first magnetizes t...

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Problems solved by technology

[0005] Many documents at home and abroad have conducted detailed research on the leakage magnetic field generated by the pipeline defect itself, but there are few studies on the analysis of the air-coupled magnetic field. 2007, Vol.47, No.1,:21-24) analyzed the generation and composition of the air-coupled magnetic field, but did not propose how to analyze and test the air-coupled magnetic field

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