A control method for rapid shutdown of thin plate in a vertical continuous annealing unit

Abstract

The present invention relates to a control method for rapid shutdown of thin plates in a vertical continuous annealing unit. The control method includes the following steps: S1, switching the annealing furnace to a cooling mode, and performing temperature control on it; S2, reducing the speed of the unit (speed control); S3 1. Reduce the tension of the unit (tension control); S4. When the speed of the unit is reduced to below 400mpm, press the stop button; S5. After the unit stops, the annealing furnace section unloads and conveys the steel strip to the annealing furnace to ensure that the front and rear belts of the annealing furnace are Steel slack; this scheme ensures the steady deceleration of the unit and reduces the fluctuation of tension in the furnace through the reasonable adjustment of unit speed and tension, and adopts small tension control to ensure that the strip runs stably and does not deviate during the deceleration process. , avoiding the problem of ribbing caused by uneven stress along the width direction of the strip under high tension.

Description

technical field [0001] The invention relates to a method for controlling rapid shutdown of thin plates in a vertical continuous annealing unit, in particular to a control method for rapid shutdown of cold-rolled thin strip steel in the process of stable operation in a vertical continuous annealing furnace. Strip steel is in the field of vertical continuous annealing control technology. Background technique [0002] Iron and steel enterprises mostly use continuous annealing units to recrystallize and anneal the work-hardened strip steel after cold rolling to improve its microstructure, thereby improving the plasticity and stamping formability of the strip steel. Since the high-speed thin plate continuous annealing unit has the characteristics of fast strip running speed (600mpm-700mpm), thin strip steel specification (0.17mm-0.25mm), high furnace temperature (up to 840°C), etc., it is very important for the stability of equipment status and process Sex is very demanding. ...

AI Technical Summary

Problems solved by technology

However, in the actual production process, because the temperature in the annealing furnace has the characteristics of thermal inertia, the speed reduction will cause the temperature of the strip steel in the furnace to rise. It will cause the unit to break

[0004] After retrieval, the Chinese invention with the application number 201510004294.X discloses a control method for preventing the thin strip steel from buckling when the continuous annealing furnace is shut down. It is characterized in that when the production line breaks down, the unit is reduced to 0. This technology has a large span of deceleration range and high temperature in the furnace, which cannot effectively control the fluctuation of tension in the furnace, and the patent does not propose how to adjust the tension in the furnace. During the shutdown process of the unit, the operator cannot adjust the temperature. , speed and tension are manually intervened, lack of flexibility, and the application effect is not ideal. Therefore, a new technical solution is urgently needed to solve the above technical problems

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