High-precision online measuring instrument and measuring method for strip shape of plate and strip

Abstract

The invention discloses a high-precision online measuring instrument and a measuring method for the strip shape of a plate and strip, and relates to the measurement of the strip shape of a metal plate and strip. The method comprises the following steps of: distributing 3 beams of line laser along the motion direction of the plate and strip; irradiating on the surface, in the width direction, of the plate and strip to form 3 laser irradiation lines, wherein the included angle between the line laser and the horizontal plane is 30 to 60 degrees; shooting the changes of the positions of the laserirradiation lines on the surface of the moving plate and strip at a high speed by using three full high-definition surface scanning digital cameras above a laser irradiation area of the plate and strip; respectively sending the changes of the positions to a digital signal process (DSP) to obtain the position of a laser spot on each measurement strip; calculating to obtain the parameters of the strip shape of the plate and strip by using a measurement control cabinet; displaying the parameters on a screen of a computer; and storing the parameters in the computer. The instrument and the method have wide adaption range, high measurement precision and high measurement speed, can be used for measuring the strip shape of a cold or hot rolled metal plate and strip, and can ensure long-term reliable and stable operation in very bad environment of metallurgical production.

Description

technical field [0001] The invention belongs to the technical field of optical-mechanical-electrical integration, and in particular relates to the on-line measurement of the shape (flatness) of metal plates and strips in cold and hot states without tension. Background technique [0002] The shape (flatness) parameter of cold and hot-rolled metal sheets and strips is an important index to describe product quality. It is necessary to install a shape measuring instrument on the production line. Flatness measurement is divided into contact and non-contact measurement methods. The metal sheet and strip in the hot rolling environment are in a high temperature state. The current contact sensor used for flatness measurement cannot withstand the influence of high temperature. The hot rolling environment requires non-contact methods and optical methods are commonly used for shape measurement. The optical method is suitable for measuring the flatness of the hot-rolled strip before th...

AI Technical Summary

Problems solved by technology

[0005] The point laser or line laser shape meter arranged in a single row of lasers is based on the principle of continuous measurement of the height of the strip to obtain the straightness of the strip. The flatness results measured by this method are seriously distorted when the wave shape of the plate and strip does not move at the measurement position during normal travel.

[0006] The point laser light sources arranged in single or multiple rows are discontinuously distributed in the width direction of the strip. When the width specification of the strip changes or the strip swings left and right during the travel, in most cases the laser cannot be irradiated on the strip. The edge of the strip, therefore, the edge wave data measured by the shape meter is not the real edge wave data, which will cause measurement errors

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