High-sensitivity magnetic leakage detector

Abstract

The invention discloses a high-sensitivity magnetic leakage detector. The middle portion of a mobile dolly frame is provided with a crossbeam, an armature is arranged under the crossbeam, the crossbeam is symmetrically provided with two suspension rods, the lower ends of the suspension rods are connected with the upper portion of the armature, the upper ends of the suspension rods traverse through the crossbeam and are in threaded connection with the crossbeam, a pair of magnets cling to the lower portions of two ends of the armature, a probe for detecting a baseboard is arranged between the two magnets, the probe is sleeved with a probe box, a spring is arranged between the probe box and the armature, a hollow telescoping rod is arranged above the probe, the hollow telescoping rod is composed of a hollow lower rod body and a hollow upper rod body covering the hollow lower rod body, the hollow lower rod body can linearly telescope and shift relative to the hollow upper rod body, the upper end of the hollow upper rod body traverses out of the armature and is fixed to the armature, the lower end of the hollow lower rod body is connected with the upper end of the probe box, and a lead on the probe traverses out of the hollow lower rod body and the hollow upper rod body and then is sequentially connected with a data collector and a portable computer which are arranged on a mobile dolly. The detector has high detection sensitivity, and is suitable for detecting storage tank baseboards with different thicknesses.

Description

technical field [0001] The invention belongs to the field of equipment non-destructive testing, and in particular relates to a high-sensitivity magnetic flux leakage detector. Background technique [0002] As a kind of static equipment for storage media in petroleum and chemical industries, storage tanks are widely used. However, when applied, the bottom plate of the storage tank is more prone to electrochemical corrosion, and the degree of corrosion is more severe than that of the tank wall. Sometimes, corrosion and perforation may even occur. The phenomenon of oil leakage. The bottom of the tank is not easy to inspect and repair, and it is also a place prone to corrosion. When the bottom plate is welded, the anti-corrosion coating near the weld is often burned off, which increases the severity of corrosion. The tank body is not only easy to corrode near the weld, but also the surrounding parts that are easily corroded. If the tank body is not well sealed with asphalt, rai...

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Problems solved by technology

[0003] The magnetic flux leakage nondestructive testing method has the advantages of high detection accuracy and fast speed. It is currently the main method for defect location before storage tank maintenance, but there are still some defects, such as the low detection sensitivity of the magnetic flux leakage detector.

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