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Nondestructive inspection method for electric insulator steel foot and cast zinc ring combined face

A non-destructive testing and insulator technology, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, can solve problems such as low work efficiency, detection results are easily affected by human factors, and high labor intensity, so as to achieve the effect of quality assurance

Inactive Publication Date: 2004-09-22
DALIAN UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has low work efficiency and high labor intensity, and the test results are easily affected by human factors.

Method used

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  • Nondestructive inspection method for electric insulator steel foot and cast zinc ring combined face
  • Nondestructive inspection method for electric insulator steel foot and cast zinc ring combined face
  • Nondestructive inspection method for electric insulator steel foot and cast zinc ring combined face

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Embodiment Construction

[0031] The best embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] as attached figure 1 . Calculate and determine the distance and orientation relationship between the workpiece to be measured and the probe, take the centerline of the cylinder of the workpiece to be measured as the axis of rotation, and make a plane perpendicular to the above-mentioned axis at 1 / 2 of the axial length of the cast zinc ring 3, and the intersecting axis is at Point O, on this plane, take O as the center and R as the radius to make a semicircle, and pass through the center O to make two rays intersect the semicircle M 1 , M 2 point, and its included angle is G. The centers of the transmitting and receiving surfaces of the line-focusing longitudinal wave transmitting probe 6 and the planar receiving probe 7 are located at M 1 and M 2 point, the centerlines of the cylinders of the two probes are respectively relative to th...

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Abstract

The certain distance and direction between the workpieces to be measured and the ultrasonic probe are kept. With the ultrasonic wave passing through the coupled medium, the mode conversion of the ultrasonic happens in the zinc casting ring. Let only the refractive transverse wave promulgate forward, with being reflected by the junction plane the refractivetransverse wave beam enters into the receiving probe. The electric motor drives the steel foot in a stated arc. The line focusing ultrasonic beam detects all junction planes. The defect detector outputs the synchronizing pulse and the alarm signals of the losing wave and the forwarding wave. The control and counting circuit synchronistically records the total number of the synchronizing pulse and the cumulative number of the synchronizing pulse when both alarm signals of the losing wave and the forwarding wave happen, showing the rate of the defect area.

Description

technical field [0001] The invention relates to the technical field of non-destructive detection of steel feet of electric porcelain insulators in the electric power industry, in particular to a non-destructive detection method for the quality of the joint surface of the insulator steel feet and cast zinc rings. Background technique [0002] Porcelain insulators widely used in high-voltage DC power transmission lines have zinc rings cast outside their steel feet, and the quality of the joint surface between the steel feet and the cast zinc ring is directly related to the service life of the insulator and the safety of the line. [0003] At present, the evaluation index for the quality of the joint surface of insulator steel feet and cast zinc rings in production is the joint area ratio or defect area rate, which represent the ratio of good joint area or bad joint area to the total joint area respectively. The common detection method is to use a tensile testing machine to str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04
Inventor 李喜孟邵建华谭家隆李喜良李萍于伟刘军民
Owner DALIAN UNIV OF TECH
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