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Pipeline bending stress detection device

A bending stress detection device technology, applied in measuring devices, electromagnetic measuring devices, electric/magnetic profile/curvature measurement, etc., can solve problems such as human health hazards, expensive X-ray diffractometers, and high requirements for uniformity and continuity. Achieve the effects of resisting environmental interference, fast detection speed, and ensuring reliability

Active Publication Date: 2021-06-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that it has high requirements for the uniformity and continuity of the measured material, and the X-ray diffractometer is expensive, which has a certain risk of harm to human health.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0061] Example 1: Pipeline Bending Stress Detection Under Weak AC Magnetization Conditions

[0062] In this embodiment 1, a single magnetic sensor 4 is made up of a magnetoresistive sensor 7 and an excitation coil 8 (that is, the number of the excitation coil matches the number and position of the magnetic sensor), wherein the magnetoresistive sensor 7 is located above the central axis of the excitation coil 8 , whose structure is shown in Figure 5 shown. The four magnetic sensors 4 are respectively installed in the four positions of up, down, left and right of the in-pipeline detector 1 . The in-pipe detector 1 is placed in the pipeline 5 , and the axis of the in-pipe detector 1 is parallel to the axis of the pipeline 5 .

[0063] In the experiment, driven by the fluid 6, the detector 1 in the pipeline runs smoothly to a certain position in the pipeline 5, and four excitation coils 8 carrying AC voltage signals generate weak AC magnetic fields to magnetize the upper, lower...

Embodiment 2

[0075] Example 2: Pipeline Bending Stress Detection under Strong DC Magnetization Conditions

[0076] In this embodiment 2, it is necessary to adsorb a strong magnet 15 on the outside of the pipe wall of the pipe 5 in advance, up, down, left, and right, and each of the four positions corresponding to the inside of the pipe wall of the pipe 5 has a magnetic sensor 4. like Figure 9 shown. The strong magnets 15 respectively strongly magnetize the four local areas. If there is bending deformation on the pipe wall here, it can be seen from the magnetoelastic effect that the DC magnetic field value near the pipe wall will change with the bending stress. Four magnetic sensors 4 are used to collect synchronously The magnetic sensor 4 will output four sharp DC magnetic field signals near the four local areas of the upper, lower, left, and right sides of the pipe wall, and record their intensities as B 1 , B 2 , B 3 and B 4 , the corresponding relationship between the four DC magn...

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Abstract

The invention discloses a pipeline bending stress detection device which comprises a cylindrical pipeline inner detector, four supports with the same length extend from a center hole of the pipeline inner detector, the angle between every two adjacent supports is 90 degrees, and the tail end of each support is provided with a magnetic sensor used for detecting a magnetic field signal near a pipeline; the four magnetic sensors are attached to the inner wall of the pipeline all the time in the advancing process of the in-pipeline detector, and magnetic signals on the upper side, the lower side, the left side and the right side of the axial path of the pipeline are scanned and collected; and the stress distribution on the pipe wall is judged by analyzing the difference among the magnetic signals acquired by the four magnetic sensors, so that the pipeline bending detection is realized. According to the invention, characteristic analysis can be carried out on the magnetic field signal collected on the running path of the internal detector, and the bending state of the pipeline can be judged according to the analysis result, so that nondestructive testing of the bending stress of the pipeline is realized.

Description

technical field [0001] The invention relates to the field of stress detection, in particular to a pipeline bending stress detection device. Background technique [0002] With the continuous development of the world economy, the demand for oil and gas resources in various countries is increasing. As a special transportation mode of oil and gas resources, pipeline transportation has been widely used at home and abroad. While the length of pipeline transportation continues to increase, it also brings many safety problems. Because the pipeline spans a wide area and the surrounding conditions are complex, the pipeline is prone to bending deformation during the transportation of oil and gas, which will cause fatigue failure or even rupture of the pipeline body, thereby shortening the service life of the pipeline. When the pipeline is bent and deformed, there will be a special stress distribution on the pipe wall. Therefore, in order to ensure the safe operation of the oil and ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/12G01B7/28
CPCG01L1/127G01B7/28
Inventor 黄新敬李健封皓张宇曾周末燕玉田
Owner TIANJIN UNIV