An intelligent control device for liquid nitrogen fine cooling of cold-rolled strip

Abstract

The invention discloses a cold rolling strip liquid nitrogen refined cooling intelligent control device. A liquid nitrogen refined cooling device and a wireless intelligent control system are designedto realize point-to-point intelligent control of a roller and the strip transverse temperature during the rolling process, and the demands of asymmetrical rolling and other specific technology are met; in addition, nano-particles are added in a liquid nitrogen box to form liquid nitrogen mixed solution, the friction condition and the shape characteristic of a roll gap contact interface of a rolling deformation area are adjusted and the roller copying rate and the rolled strip surface quality are increased and improved.

Description

technical field [0001] The invention relates to the field of automatic measurement and control of rolling equipment, in particular to a cold-rolled strip liquid nitrogen precision cooling intelligent control device for high-grade strip steel, aluminum strip, copper strip and other cold strip products. Background technique [0002] With the rapid development of industrial technology and the continuous improvement of cold rolling theory, the requirements for strip shape, plate thickness and surface quality are getting higher and higher, especially for ultra-thin cold-rolled strips with large width-to-thickness ratios. During the process, the deformation is complicated, the local plate shape problem is prominent, and the online control is very difficult. [0003] From the point of view of the plate shape control characteristics, theoretically, segmental cooling is a very effective control method. The main function is to adjust the hot roll shape or local roll gap shape online, ...

AI Technical Summary

Problems solved by technology

However, in the production process, the main problem of the traditional cooling method is that the emulsion is easy to remain after rolling, which affects the surface quality of the strip. It is necessary to configure a purging device at the outlet to remove the emulsion residue in time. In addition, when the emulsion is reused, it needs to Equipped with an independent filter device, the cost is high and the pollution is large. If there is flammability, there will be safety hazards

[0006] From the perspective of cooling mechanism, the traditional cooling method is limited by the contact medium and environmental conditions, the thermal conductivity is limited, and when the roll and the strip move synchronously at high speed, the heat transfer efficiency is relatively reduced, making it difficult for the traditional cooling method to achieve immediate regulation effect, it is not easy to meet the technical requirements of ultra-fast cooling and high-speed parameter response in the current high-speed rolling process

[0007] From the perspective of lubrication mechanism, the traditional cooling method is affected by roll gap stiffness, oil film thickness, force conditions, rolling speed, reduction rate, strip material, specification, and even its three-dimensional deformation characteristics. The characteristics of obvious changes in the contact conditions or friction conditions between the roll and the strip

Especially for extremely thin strips with large width-to-thickness ratios, when the local deformation difference is large or there are obvious waves, the contact conditions between the strip and the roll along the transverse direction will be greatly different, resulting in friction coefficients, heat conduction laws, and lubrication conditions along the transverse direction. And then the average value, otherwise it will affect the local deformation law in the transverse direction of the strip, thereby deteriorating the shape and surface quality of the strip

[0008] On the whole, the above problems limit the scope of application of traditional cooling methods, and the lack of high-precision temperature control models and high-efficiency temperature control devices reduces its application effect and industrialization process.

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