Cooling system for rolled stripe continuously-casting production line and control method thereof

Abstract

The invention relates to control devices or methods specially for metal rolling machines and manufacturing products of the metal rolling machines and discloses a cooling system for a rolled stripe continuously-casting production line and a control method of the cooling system. The system comprises a segmented laminar flow cooling device and a cooling control system which are arranged behind an online hot rolling machine, wherein the segmented laminar flow cooling device comprises at least two segmented laminar flow cooling collecting pipe areas, wherein one of the at least two segmented laminar flow cooling pipe collecting areas adopts a nozzle cooling collecting pipe with small pipe diameter, the cooling control system is an online double-closed-loop control system and comprises a double-closed-loop control circuit, the double-closed-loop control circuit comprises a feedforward control module, a precomputation module, a feedback control module, a coiling-ahead temperature measuring module and a self-adaption learning module, the double-closed-loop control circuit selects at least one collecting pipe area of the segmented laminar flow cooling device, the number of open collecting pipes in the selected collecting pipe area can be adjusted by a group of control valves, and the requirements on the accuracy of coiling temperature of steel stripes rolled at a low speed during the variation of speed and thickness in a limited cooling area can be met by the nozzle cooling collecting pipe with the small pipe diameter and the online double-closed-loop control system.

Description

technical field [0001] The invention relates to a control device or method specially suitable for a metal rolling mill or its processed products, especially suitable for the post-rolling cooling system of a thin strip continuous casting production line and its control method by spraying water to cool the products. Background technique [0002] Thin strip casting and rolling is the most typical energy-saving and high-efficiency new technology in near-net shape processing technology. Compared with traditional continuous casting and continuous rolling processes, it has many advantages: low production cost, low engineering investment, high yield, energy saving and environmental protection, It occupies less land and can be used to produce high value-added thin-gauge hot-rolled products. [0003] Based on the superiority of the thin strip continuous casting process, the world's major steel companies have invested a lot of money in research and development of thin strip continuous ...

AI Technical Summary

Problems solved by technology

In addition, the nozzle structure of the two-fluid nozzle is complicated and easy to block, so the manufacturing cost and maintenance cost of the device are relatively high

Moreover, the pressure control of air and water is complicated, it is difficult to maintain a certain air-water ratio, and the cooling capacity is unstable due to the change of the air-water ratio

On the other hand, when using water mist cooling, although the cooling capacity can be controlled by adjusting the water volume of the nozzle, the stable spray shape cannot be ensured when the nozzle conforms to the pressure reduction, and the cooling capacity control range is narrowed compared with the two-fluid nozzle

[0012] To sum up, none of the cooling devices and methods disclosed in the above-mentioned patent documents is designed specifically for the cooling after continuous casting and rolling of thin strips, especially for the variable speed and thickness control methods in the production process, which cannot meet the actual needs. , for thin strip continuous casting, a brand-new technological process that is in the transition period from experiment to industrial mass production worldwide, a special cooling device and a set of effective control methods are very much needed

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