Steel tube pulse magnetization magnetic flux leakage detecting device

A flaw detection device, pulse technology, applied in the direction of material magnetic variables, etc., can solve the problems of high cost, low practicability, large floor space, etc., and achieve the effect of compact equipment, simple structure, and low maintenance cost

Inactive Publication Date: 2016-02-17
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the device has two sets of longitudinal defect detection hosts, the mechanical structure and signal system are complicated, the floor space is large, the cost is high, and the practicability is low

Method used

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  • Steel tube pulse magnetization magnetic flux leakage detecting device
  • Steel tube pulse magnetization magnetic flux leakage detecting device
  • Steel tube pulse magnetization magnetic flux leakage detecting device

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Embodiment Construction

[0022] The present invention will be described in detail below in conjunction with the accompanying drawings and examples.

[0023] Such as figure 1 As shown, the DC pulse magnetization magnetic flux leakage flaw detection device includes: a conveying wheel 1 , a flaw detection host 2 and a steel pipe 3 . The steel pipe 3 is driven by the transmission wheel 1 and moves in a straight line. The flaw detection host 2 includes a surface array sensor 4 arranged in a 360° full circumference, vertical magnetizer groups 5 and 5', and horizontal magnetizer groups 6 and 6'. The defect leakage magnetic field is converted into an electrical signal by the area array sensor 4, and then enters the computer through the filter 7, the amplifier 8, and the A / D converter 9 in sequence.

[0024] Such as figure 2 As shown, the steel pipe 3 moves linearly under the drive of the transmission wheel 1 .

[0025] Such as image 3 As shown, two pairs of mutually perpendicular magnetizers are arrang...

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PUM

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Abstract

The invention discloses a steel tube pulse magnetization magnetic flux leakage detecting device which comprises two pairs of circumferential magnetizers and an area array sensor. The two pairs of the circumferential magnetizers are vertically arranged in the circumferential direction of a steel tube, pulse magnetization currents of which the values of amplitude are equal and the difference of phase positions is a half cycle are introduced, and time-sharing magnetization of different parts of the steel tube is achieved; the area array sensor is arranged in the circumferential direction of the steel tube in a 360-degree full-coverage mode, and defect magnetic flux leakage fields of effective magnetization parts are obtained according to timing sequences of pulse currents. According to the steel tube pulse magnetization magnetic flux leakage detecting device, a movement mode that a steel tube to be detected is pushed in a high-speed linear mode is achieved, and full coverage detection of longitudinal defects of the steel tube can be achieved through a set of fixed type detection units. Meanwhile, the problem of longitudinal defect detection for long and thin ferromagnetic components such as coiled tubings, square drill rods and steel rails which can not do rotary motion by themselves easily is solved.

Description

technical field [0001] The present invention relates to the field of non-destructive testing, in particular to a pulse magnetization magnetic flux leakage flaw detection device for steel pipes. Background technique [0002] As an important transportation and support material, steel pipes are widely used in petrochemical and infrastructure construction. With the rapid development of industrial modernization, the demand for high-quality steel pipes is increasing. At present, my country has the world's most advanced steel pipe production technology and the latest pipe rolling unit, and the pace of steel pipe production is getting faster and faster. According to the requirements of the American Petroleum Institute (API), all steel pipes must undergo 100% quality inspection before leaving the factory. [0003] As an efficient detection method, magnetic flux leakage detection can effectively detect internal and external defects of steel pipes, and has low requirements on the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/83
Inventor 伍剑波王杰方辉唐健
Owner SICHUAN UNIV
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