Precise control method for anti-scrap of hot-rolled low-temperature coiling strip surface purification device

Abstract

The invention relates to the field of strip steel surface purification, in particular to a steel scrap prevention accurate control method of a surface purification device of hot-rolled low-temperaturecoiling strip steel. The steel scrap prevention accurate control method of the surface purification device of the hot-rolled low-temperature coiling strip steel is provided, the surface purificationdevice of the hot-rolled low-temperature coiling strip steel is set an initial height, a preparation height, a waiting height, and a blowing and sweeping height on a vertical height of the upper surface of the strip steel in sequence from far to near, after the head of the strip steel enters a first machine frame of a finishing mill, the surface purification device of the hot-rolled low-temperature coiling strip steel is descended to the preparation height, when the head of the strip steel enters the last machine frame of the finishing mill, the surface purification device of the hot-rolled low-temperature coiling strip steel is descended to the waiting height; after the head of the strip steel reaches the lower portion of the surface purification device of the hot-rolled low-temperature coiling strip steel, the surface purification device of the hot-rolled low-temperature coiling strip steel is descended to the blowing and sweeping height to start blowing and sweeping operation by starting a blowing and sweeping valve of the surface purification device of the hot-rolled low-temperature coiling strip steel. According to the method, the surface purification device of the hot-rolledlow-temperature coiling strip steel is gradually adjusted to the blowing and sweeping height according to the position of the head of the strip steel, so that the surface purification device of the hot-rolled low-temperature coiling strip steel can blow the surface of the strip steel as closely as possible, the characteristic that the blowing force is greatly attenuated along with the increase ofthe distance is avoided, and the purification effect is ensured.

Description

technical field [0001] The invention relates to the field of steel strip surface purification, in particular to a control method for a surface purification device for hot-rolled low-temperature coiled steel strip. Background technique [0002] Temperature is the most important factor affecting the microstructure and performance of the steel plate. To control the microstructure and performance and achieve quality uniformity, it is necessary to control the temperature during the production process and realize the effective tracking of the whole production process, especially the hot-rolled laminar flow cooling coiling zone. Steel temperature control and surface quality tracking. In order to improve the control ability of the strip temperature and surface quality, domestic and foreign iron and steel industries have strengthened the strip temperature detection and surface quality control driven by strip quality optimization, and focused on blowing the strip surface by using nozz...

AI Technical Summary

Problems solved by technology

[0003] With the continuous development and practical application of hot-rolled strip steel with low coiling temperature varieties, there are difficulties in surface temperature detection, surface quality detection and coiling temperature precision control.

Taking low coiling temperature varieties below 500°C as an example, the purging equipment equipped with the existing laminar flow cooling equipment is only suitable for cold-rolled strip. If the distance is too far, the blowing force will drop significantly, and the residual water on the surface of the strip will seriously affect the stability of coiling temperature measurement and the accuracy of surface quality detection;

[0004] When the hot-rolled low-temperature coiled strip surface purification device is purging online, in order to avoid the characteristic that the purging force will be greatly attenuated with the increase of distance, it should be as close as possible to the upper surface of the laminar cooling strip to ensure the purification effect, but the hot-rolled The plate shape of the low-temperature coiled steel strip often has a warping phenomenon at the head and tail, and the conveying speed of the strip steel is very fast. A very long section of strip steel cannot be accurately measured, which seriously affects the production quality, and the blowing equipment that is too close may be hit by the head of the strip steel and cause scrap steel, so a special blowing equipment control method is required, as much as possible Reduce the demand for injection pressure and avoid steel scrap accidents

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