Temperature compensation method and device for improving detection precision of ray type thickness gauge

Abstract

The invention provides a temperature compensation method and device for improving the detection precision of a ray type thickness gauge. According to the scheme, the device comprises the thickness gauge and a scanning type pyrometer, the scanning type pyrometer detects the temperature of the whole cross section of strip steel, and a collected signal is connected to a special processor for processing; the collected signal is transmitted to a thickness gauge control system through a serial port or the Ethernet and other manners, and temperature compensation coefficients of all points in the width direction are calculated through a temperature compensation calculation program block in the thickness gauge control system; and a deviation value is set, and the temperature compensation coefficients are calculated by adopting a temperature average value in the width direction when the temperature detection values of two adjacent points exceed a deviation value or the temperature detection value of a certain point suddenly changes to exceed a deviation range. Thickness detection precision can be improved, thickness calculation and detection are prevented from being affected by an abnormal temperature zone, the purpose of accurately measuring the thickness, convexity and wedge shape of the strip steel is achieved, and meanwhile the product quality and the production stability are improved.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to a temperature compensation method and device for improving the detection accuracy of a ray thickness gauge. Background technique [0002] The iron and steel industry is a pillar industry of our country and an important part of economic construction. Steel rolling is an important part of steel production in iron and steel enterprises, and the thickness is the key to determine the quality of steel. Unlike the length and width, the thickness of strip steel can be cut and processed according to customer needs. The thickness of strip steel must be adjusted during the rolling process. Accurate detection and control, therefore, it is necessary to use a high-precision thickness gauge to detect the real-time strip thickness during the production process. Pyrometers are generally used for detection during detection. Pyrometers generally refer to a type of instrument that does not com...

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Problems solved by technology

[0003] At present, when the thickness is measured by the ray-type thickness gauge, it is necessary to convert the hot-state thickness detection value of the strip steel into the cold-state thickness value. The temperature compensation coefficient used in the algorithm is calculated based on the temperature measured by the single-point pyrometer inside the thickness gauge. However, in the thin slab continuous casting and rolling production line, because there is no traditional gas heating furnace for heating in front of the roughing stand, there is generally a problem of uneven temperature distribution in the horizontal direction of the strip. If the strip temperature in the detection area of ​​the point pyrometer is abnormal, then The calculation of the temperature compensation coefficient of the strip will inevitably lead to excessive deviation in the conversion process of the cold and hot state thickness values, and the calculated strip thickness, convexity and wedge shape will produce large errors, which is not conducive to the control of the strip shape. and quality

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