Magnetic flux leakage detecting device for steel pipe and detection method thereof

Abstract

The invention provides a magnetic flux leakage detecting device for a steel pipe and a detection method thereof. The device comprises a first magnetizing coil, a hollow rotator and a second magnetizing coil, wherein the hollow rotator is provided with a probe rack with an inductive probe and drives the probe rack to rotate under the action of a rotation driving device; a probe shell is sleeved on the inductive probe; a plurality of inductive probes are distributed at equal degrees around the periphery of a through hole of the steel pipe; a steel pipe guider is arranged between the probe rack and the second magnetizing coil and provided with an axial driving device and a radial driving device; the end face of the steel pipe guider, close to the probe rack, is provided with a contact sensor and the end face of the other side is provided with a position sensor. By adopting the movement design of an anti-collision probe shell and the steel pipe guider, the detection of the end part of the steel pipe becomes possible, and the blank that the magnetic flux leakage detection of the pipe body and the end part cannot be simultaneously achieved by the existing magnetic flux leakage detection device is filled up.

Description

technical field [0001] The invention relates to the technical field of steel pipe magnetic flux leakage detection, in particular to a steel pipe magnetic flux leakage detection device and a detection method thereof. Background technique [0002] After the steel pipe is manufactured, it must be inspected to determine whether the steel pipe is defective. In recent years, magnetic flux leakage detection technology has been widely used in steel pipe detection due to its advantages of fast detection speed, high precision, and easy automation. [0003] At present, the magnetic flux leakage detection device for steel pipes can only complete the magnetic flux leakage detection of the pipe body, but cannot complete the detection of the end of the pipe body at the same time. The reason why there is an end detection blind spot in the magnetic flux leakage detection of steel pipes is that in the high-speed detection process of steel pipes, when the end of the steel pipe just reaches th...

AI Technical Summary

Problems solved by technology

However, during the use of steel pipes, the ends of steel pipes are often the main stress-bearing parts, and the existence of blind detection areas at the ends poses a great potential safety hazard

[0004] In response to the above problems, at home and abroad, the end of the steel pipe is mainly detected by targeted detection in the later stage to eliminate the blind spot of the end of the steel pipe, such as the magnetic particle detection method, which greatly increases the production cost and prolongs the production cycle. It is imminent to detect the magnetic flux leakage detection device for steel pipes

At the same time, when replacing steel pipes with different diameters, the probes in the existing steel pipe magnetic flux leakage detection device need to be adjusted manually

Manual adjustment of the probe will seriously affect the detection accuracy of the steel pipe, and the detection line needs to be stopped to adjust the probe, which reduces the detection efficiency

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