Electromagnetic torque change based method for nondestructive detection of defect in conductor

A non-destructive testing, electromagnetic torque technology, applied in the direction of material magnetic variables, etc., can solve the problems of limited applicable environment, complex equipment, large size of measuring instruments, etc. Effect

Active Publication Date: 2015-03-04
GRADUATE SCHOOL OF THE CHINESE ACAD OF SCI GSCAS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally speaking, the equipment is relatively complicated, the volume of the measuring instrument is large, and the ability to apply to the environment is greatly limited

Method used

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  • Electromagnetic torque change based method for nondestructive detection of defect in conductor
  • Electromagnetic torque change based method for nondestructive detection of defect in conductor
  • Electromagnetic torque change based method for nondestructive detection of defect in conductor

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Embodiment Construction

[0020] The non-destructive detection method for defects in conductors based on electromagnetic torque changes proposed by the present invention, the principle schematic diagram of its embodiment is as follows figure 1 shown, including the following steps:

[0021] (1) a torque sensor (not shown) is set on one side of a radially magnetized, thickness w cylindrical permanent magnet 1;

[0022] (2) drive cylindrical permanent magnet 1 to rotate, remove driving force when cylindrical permanent magnet 1 reaches an initial speed, make cylindrical permanent magnet 1 continue to rotate under inertia effect; In one embodiment of the present invention, adopt electric The method of magnetic induction drives the cylindrical permanent magnet 1 to rotate, such as figure 1 As shown, the driving of the cylindrical permanent magnet 1 is realized by the method based on electromagnetic induction through the copper column 4 rotating under the drive of the motor 6;

[0023] (3) Make the non-defe...

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Abstract

The invention relates to an electromagnetic torque change based method for nondestructive detection of defects in a conductor, and belongs to the technical fields of power, electronic industry, metallurgical industry, semiconductor material and oil energy. This method is as below: first a torque sensor is set at one side of a cylindrical permanent magnet to drive the cylindrical permanent magnet to rotate, and conductors having no defects approach the rotating cylindrical permanent magnet, so as to measure a reference curve of change of rotating angular velocity of the cylindrical permanent magnet with time; and then a plurality of calibration curves of change of rotating angular velocity of permanent magnet with defects with time are measured; the permanent magnet approaches the conductor to be measured, so as to obtain a measurement curve; and the measurement curve is compared with the calibration curves, so as to obtain defect size of the conductor to be measured. The method is suitable for conductors such as wire, tubing and sheet metal; and the conductor to be measured does not need to move, thereby simplifying measurement conditions, measurement process, measurement cost and measurement equipment; besides, the method can easily realize automation and miniaturization, and can be applied to more fields and environment.

Description

technical field [0001] The invention relates to a non-destructive detection method for defects in conductors based on electromagnetic torque changes, in particular to a detection method for defects in conductors such as thin plates, wires, and pipe fittings, belonging to electric power, electronics industry, metallurgical industry, semiconductor materials, petroleum, etc. field of energy technology. Background technique [0002] Metal materials such as tubes, wires and thin plates may contain impurities (such as oxides, sulfide particles, etc.) holes, cracks and other defects due to raw materials and preparation processes, which will seriously affect the service performance of the material. For example, in the electric power and electronic industries, when metal wires, metal sheets, circuit boards and other materials contain non-conductive second-phase impurity particles, their electrical properties will be greatly reduced, and their mechanical strength will be reduced. The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/82
Inventor 王晓东
Owner GRADUATE SCHOOL OF THE CHINESE ACAD OF SCI GSCAS
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