An eddy current detection method for continuous casting billet shell thickness

A detection method, eddy current technology, applied in the direction of electric/magnetic thickness measurement, electromagnetic measurement device, etc., can solve the problems that have not fundamentally solved the field application of industrial production, and achieve the effect of accurate thickness measurement

Active Publication Date: 2018-09-07
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the detection methods for the thickness of the solidified billet shell at home and abroad have not fundamentally solved the problem of field application in industrial production

Method used

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  • An eddy current detection method for continuous casting billet shell thickness
  • An eddy current detection method for continuous casting billet shell thickness
  • An eddy current detection method for continuous casting billet shell thickness

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Embodiment Construction

[0041] The specific embodiment of the present invention is described below in conjunction with accompanying drawing:

[0042] The invention measures the thickness of the solidified slab shell at the exit of the continuous casting mold online. The eddy current coil of the invention measures the thickness of the solidified slab at the exit of the continuous casting mold. Due to the particularity of the object, the eddy current coil is independently designed. When the slab just leaves the continuous casting mold, the interior of the slab is a solid region, a solid-liquid two-phase region, and a liquid phase region, and the thickness of these regions is difficult to measure. First of all, it is necessary to know the thickness range of the billet shell, and design the probe and measurement system according to the measurement range.

[0043] Through the finite element simulation software ANSYS, the temperature field of the slab at the outlet of the crystallizer is simulated and calc...

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Abstract

The invention discloses a continuous casting billet shell thickness eddy current detection method, and belongs to the technical field of continuous casting billet detection. The object is to overcome the defect of measurement of the thickness of a continuous casting solidification shell in the prior art and provide a method for measuring the thickness of the continuous casting billet shell by employing a multifrequency eddy current measuring method and dividing the inner part of billet into layers according to the conductivity corresponding to the temperature. The method specifically includes steps: an eddy current sensor is arranged on the surface of a casting blank at an outlet of a continuous casting mold, the sensor is a mutual induction differential type sensor, the eddy current sensor performs frequency mixing excitation through a digital frequency synthesizer, frequency mixing of a plurality of excited different frequency signals is performed through an adder, measuring signals are amplified and filtered through a signal conditioning circuit, cross-correlation operation is performed with reference signals of different frequencies in a correlator, the signals are separated, amplitude-phase separation of eddy current impedance signals is performed, the separated signals are transmitted to a computer for data processing through acquisition and conversion, and the thickness of the continuous casting billet shell is obtained.

Description

technical field [0001] The invention specifically relates to an eddy current detection method for the shell thickness of a continuous casting billet, belonging to the technical field of continuous casting billet detection. Background technique [0002] In the process of continuous casting of iron and steel, through the online non-destructive detection measurement and control of the thickness of the solidified billet shell at the outlet of the crystallizer, timely and efficient detection of breakouts and the uniformity of billet shell thickness in the continuous casting production process is carried out to improve The production quality of continuous casting slabs and the improvement of continuous casting automation level are embodied in the following two aspects: real-time detection of the thickness of the billet shell at the exit of the crystallizer to withstand the static pressure of molten steel, and prevention of steel breakout production accidents in the continuous casti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/06
CPCG01B7/06
Inventor 王志春张楼成肖俊生刘志伟
Owner INNER MONGOLIA UNIV OF SCI & TECH
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