Magnetic memory method and device for diagnosing ferromagnetic component damage

A technology of ferromagnetic components and diagnostic methods, applied in the direction of material magnetic variables, etc., can solve the problems of inconvenient online detection and achieve the effect of convenient online detection

Inactive Publication Date: 2010-06-02
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires additional magnetization equipment and demagnetization devices, which brings inconvenience to online detection, and it can only detect developed defects, but for early damage such as microcracks in metal components, especially hidden defects that have not yet formed discontinuous change, it is difficult to implement effective evaluation

Method used

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  • Magnetic memory method and device for diagnosing ferromagnetic component damage
  • Magnetic memory method and device for diagnosing ferromagnetic component damage
  • Magnetic memory method and device for diagnosing ferromagnetic component damage

Examples

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Effect test

Embodiment 1

[0025] The method discloses a magnetic memory diagnosis method for damage to a ferromagnetic component 7. The surface of the component is scanned by an array of magnetic induction sensors 1, the leakage magnetic field on the surface of the component is tested, and the measured magnetic signal is converted into an electrical signal, which is amplified by filtering and A After the / D conversion process, it is input to the processor 3, and the component surface test signal information is obtained through the processor 3, so as to obtain whether a certain area of ​​the component is in a state of imminent damage or no damage, and finally displayed on the display 5. The process of the processor 3 to obtain the surface test signal information of the component, so as to obtain whether a certain area of ​​the component is in an imminent damage state or not in a damage state specifically refers to: the signal input to the processor 3 after being processed by A / D conversion is the Hp sign...

Embodiment 2

[0027] Refer to the attached figure 1 , the device includes an array scanning ferromagnetic member 7 surface, and the magnetic induction sensor 1 that converts the measured magnetic signal into an electrical signal, is connected with the magnetic induction sensor 1 and obtains the length measurement sensor 4 of the scanning distance signal, and the magnetic induction sensor 1 and the length The measuring sensor 4 is connected with a filter for filtering and processing the electric signal and the distance signal, and an amplifier for amplifying processing, and the filter and the amplifier are cascaded, connected with the filter and the amplifier and performing analog processing on the filtered and amplified signal. An A / D conversion module for digital conversion, a processor 3 connected to the A / D conversion module to process the signal, and a display 5 for displaying the signal processing result. The magnetic induction sensor 1 , the length measurement sensor 4 , the filter an...

Embodiment 3

[0029] A certain type of mud high-pressure manifold magnetic memory diagnostic test such as figure 2 As shown, it includes a magnetic induction sensor 1 and a length measuring sensor 4; a signal transmission line 2; a processor 3 and a display 5. The magnetic induction sensor 1, the length measurement sensor 4, the signal filter and the amplifier are all integrated on the detection trolley 6 and placed on the pipeline surface together. The magnetic induction sensor 1 and the processor 3 are connected by a signal transmission cable. During detection, the magnetic memory detection car 6 scans the pipeline surface quickly, and the defect 8 on the surface and inside of the pipeline or the leakage magnetic field in the stress concentration area overflows the pipeline body, is received by the scanned magnetic induction sensor 1, and passes through the filter in the detection car 6 and an amplifier to filter and amplify the signal and transmit it to the processor 3 for processing. ...

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Abstract

The invention discloses a magnetic memory method and device for diagnosing ferromagnetic component damage, and relates to the technical field of nondestructive inspection. The method is realized in the following way: carrying out array scanning on the component surface by using a magnetic induction sensor, testing the stray magnetic field on the component surface, converting the tested magnetic signal into an electric signal, and carrying out filter amplification on the electric signal, inputting the electric signal after being processed in an A/D conversion mode to a processor; and processing the processed electrical signal with the processor to obtain the test signal information of the component surface, thereby obtaining information on whether a certain region of the component is on the verge of the damage state or not in the damage state, and finally displaying the information on a display screen. The invention can detect the established defect, and can effectively evaluate earlier damage to metal components, such as microcracks and the like, and especially unshaped hidden discontinuous changes. The invention does not require lots of preparations before the detection; and in the detection process, the invention does not require that the equipment must be in the working condition of rated load, or require additional magnetizers and demagnetizers, thereby being very convenient for on-line detection.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to a non-destructive testing and diagnosis method for damage to ferromagnetic material components, which is used for early diagnosis and inspection of damage to ferromagnetic material components under fatigue loads. Background technique [0002] In production work, any engineering structure inevitably has damage similar to microcracks. The presence of these damages reduces the load-carrying capacity of the structure; even under static or slowly varying loads, fractures can occur due to the dynamic propagation of the damage. Due to the limitations of the principle and process, the traditional nondestructive testing method can only detect the defects that have developed and formed, but it is difficult to implement effective detection of early damage such as microcracks in metal components, especially the recessive discontinuous changes that have not yet formed. evalua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/82
Inventor 邓勇刚胡敏王辉荣
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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