Probe for pipe magnetic flux leakage flaw detection system

Abstract

The invention discloses a probe of a pipe leakage flux flaw detection system. The probe comprises a magnetizing coil, a fixed plate fixedly arranged on the magnetizing coil and a plurality of detection shoe supporting rods which are fixedly mounted on the fixed plate in the peripheral direction, wherein a detection shoe is mounted at the front end of each detection shoe supporting rod; a signal socket and a wiring terminal are mounted on the two sides of the fixed plate respectively; the other end of a signal line connected with the detection shoe and a thickness-measuring sensor is connected with the wiring terminal; the wiring terminal is connected with the signal socket through a cable; a plurality of detection shoe supporting rod fixing blocks are uniformly distributed at the periphery of a central through hole of the fixed plate; one end, which is far away from the detection shoe, of each detection shoe supporting rod is hinged with the corresponding detection shoe supporting rod fixing block respectively; the fixed plate is provided with a pulling detection shoe supporting rod so that the detection shoe is far away or close to a pulling device on the outer surface of a to-be-detected pipe. The probe can conveniently pass through drilling tool joints with different diameters in the process of detecting a drilling tool, so that the labor intensity is reduced and the working efficiency is improved.

Description

technical field [0001] The invention relates to the field of oil and natural gas exploitation, in particular to a probe for a magnetic flux leakage flaw detection system for pipes. Background technique [0002] The working principle of the magnetic flux leakage detection technology is: when the ferromagnetic material is magnetized in the magnetic field, the defects on the surface of the material change the magnetic permeability, that is, the magnetic resistance increases, so that the magnetic flux in the magnetic circuit is correspondingly distorted, and a part of the magnetic flux Directly passing through the defect, part of the magnetic flux bypasses the defect inside the material, and part of the magnetic flux leaves the surface of the material, bypasses the defect through the air and re-enters the material, thereby forming a leakage magnetic field on the surface of the material. Generally speaking, the deeper the crack on the surface of the material, the more opportuniti...

AI Technical Summary

Problems solved by technology

[0004] In the existing magnetic flux leakage detection system for pipes, when testing drilling tools, due to the different diameters of the joints of the drilling tools, the detection device can only be lifted by people to make it pass through the joints of the drilling tools before testing , which not only increases labor intensity, but also reduces work efficiency

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