Steel pipe cross magnetization leakage magnetic detection device
A technology of orthogonal magnetization and magnetic flux leakage detection, applied in the direction of material magnetic variables, etc., can solve the problems of low detection efficiency, difficulty in adapting to the development requirements of steel pipes, and inability to complete longitudinal damage detection.
Inactive Publication Date: 2009-06-03
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
This spiral-propelled relative motion scanning method limits the detection speed of steel pipes to less than 1.2m / s under low-speed production conditions, and the detection efficiency is low, making it difficult to adapt to the development requirements of steel pipe production and manufacturing processes; Comprehensive detection of omni-directional flaws on rotating steel pipes (such as coiled tubing, kelly, and rails, etc.); detection of longitudinal flaws on axial welds (parallel to the axis (or weld)) cannot be completed
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[0020] Such as Figure 1a , 1b , 1c, shown in 1d, the principle of detection device of the present invention is:
[0021] The axial magnetizer 1 can axially magnetize the steel pipe 2 with a 360° circumferential pipe wall, thereby forming an excitation detection area for the transverse damage leakage field on the 360° circumferential pipe wall area; the magnetic poles of the first circumferential magnetizer 3 and 3' are opposite Due to the divergent magnetic field at the circumferential wall of the steel pipe 2, it is not easy to excite the longitudinal damage leakage field, which is a blind spot for the static detection of longitudinal damage, and finally can only form a vertical vertical damage in the circumferential pipe wall area of less than 360° at the steel pipe wall far away from the magnetic pole. The first and second excitation detection areas A and A' of the damage leakage field. For this reason, a second circumferential magnetizer 4, 4' is additionally added, wh...
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The invention discloses to a steel pipe cross magnetization leakage magnetic detection device, comprising a transverse injury detection unit, a first and a second longitudinal injury detection units and a signal acquisition processor; two longitudinal injury detection units are an orthogonal relation of 90 degrees of included angle in the circumferential direction of a steel pipe to be detected; the transverse injury detection unit and the two longitudinal injury detection units are arranged in the axis direction of the steel pipe to be detected; the signal acquisition processor is connected with the transverse injury unit and the two longitudinal injury detection units respectively and picks the analog signals of a longitudinal and transverse injury leakage magnetic field respectively; after the filter amplification and A / D conversion of the analog signals, digital detection signals are obtained. By the device, the high efficiency detection of omni-directional injuries on the steel pipe can be directly finished in a way that the steel pipe to be detected passes through a fixed detection unit straightly at a high speed; meanwhile, the device solves the problem that the omni-directional injuries on the steel pipe (such as coiled tubing, square drilling tools, steel rails, and the like) which has difficulty in rotating is difficult to be detected automatically and rapidly; the device can also detect the longitudinal injuries at axial welding seams.
Description
technical field [0001] The invention relates to a magnetization technology for steel pipe magnetic flux leakage non-destructive detection, in particular to a steel pipe magnetic flux leakage detection device based on orthogonal magnetization. Background technique [0002] As engineering materials or devices, steel pipes have been widely used in my country's petroleum and petrochemical industry production and infrastructure projects. With the rapid development of social production and construction, the production and demand of seamless and welded steel pipes continue to grow, and the production efficiency and speed increase rapidly. At present, according to the requirements of the American Petroleum Institute (API), seamless steel pipes and welded steel pipes must be 100% inspected before leaving the factory. [0003] As a non-destructive testing technology, magnetic flux leakage testing has been widely used in steel pipe automatic testing production lines. In the magnetic ...
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IPC IPC(8): G01N27/83
Inventor 康宜华孙燕华
Owner HUAZHONG UNIV OF SCI & TECH