Device and method for camber detection of hot-rolled intermediate slab considering thickness variation

Abstract

The invention relates to the field of automatic steel rolling control, and provides a hot rolling intermediate billet camber detecting device considering the thickness change. The detecting device comprises two cameras, two sets of installing supports, two position sensors, an image processing server and a user display. The cameras are arranged above an outlet and inlet roller bed of a roughing mill through the installing supports. Shot images are transmitted to the image processing server through the network. The image processing server is connected with the user display through a data line. The position sensors are arranged in a detection area on one side of the roller bed and connected with camera shooting triggering ports through cables. The invention further provides a detecting method based on the device. An intermediate billet thickness factor is introduced, the shot images are processed, and the intermediate billet plane shape and the camber value are obtained, and displayed on the user display. According to the detecting device and the detecting method, the structure is simple, the manufacturing cost is low, the calculating speed is high, the measuring precision is high, and the detecting device and the detecting method are suitable for online non-contact measurement of the hot rolling intermediate billet camber.

Description

technical field [0001] The invention relates to the field of automatic control of steel rolling, in particular to a camber detection device and detection method of a hot-rolled intermediate slab considering thickness variation. Background technique [0002] The camber of the hot-rolled intermediate slab is the main manifestation of the asymmetric defect of the slab in the rough rolling stage of hot rolling. The extension in the length direction is different. Once the hot-rolled camber occurs in the rough rolling stage, it will cause difficulties in strip threading, deviation, and even steel stacking and other production accidents in the subsequent finishing rolling stage, which will seriously affect product quality and production stability. In order to achieve effective control of the camber of the intermediate billet, the measurement of the camber of the intermediate billet must first be completed. [0003] At present, most roughing mills of hot rolling production lines a...

AI Technical Summary

Problems solved by technology

Patent 3 and Document 1 both use a laser rangefinder to measure the bending degree of the slab. During the use, it is also necessary to obtain the movement speed of the slab, and the head and tail of the slab are required to be in a regular rectangle. In order to make the side laser The range finder can measure the distance from the edge of the slab to the laser generator, which requires a large and relatively fixed thickness of the slab. These requirements can be met in the slab in the continuous casting production process. However, the slab moves during the rough rolling stage of hot rolling. The speed will change, irregular shapes such as "snake head" and "fish tail" will appear at the head and tail, and rough rolling is generally multi-pass reversible rolling, and the thickness of the slab will change greatly

Therefore, the methods provided by Patent No. 3 and Document No. 1 are not applicable to the measurement of the planar shape of the slab in the rough rolling stage of hot rolling

At the same time, in the previous scheme of measuring the camber of the intermediate slab by machine vision, the influence of the measured strip thickness on the measurement results was not considered, so there was a large error

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