A method for preventing hot-rolled layer from chasing steel in cold roller table

Abstract

The invention relates to a method for preventing a cool roller bed of a hot rolling layer from steel rear-end collision. The rolling rhythm of adjacent front band steel and back band steel are controlled according to different steel types and specifications based on a preset technique requirement through a hot metal detector combined with a basic automatic controller and a process controller; and under the premise of ensuring the rolling rhythm, steel rear-end collision of a layer cool zone due to differences in steel types and specifications can be avoided. The method includes the steps: 1, theoretically calculating out a time gap value T between the tail of the front band steel and the head of the back band steel; 2, practically detecting and calculating out a real time gap value T ' between the tail of the front band steel and the head of the back band steel; and 3, comparing the T and the T ', and issuing an on-site swinging command or a moving command to the back band steel according the comparison result. The method can shorten overlong gap time during manual control processes, reduce unnecessary time waste, and can avoid steel rear-end collision of the layer cool zone due to differences in steel types and specifications under the premise of ensuring the fastest rolling rhythm.

Description

technical field [0001] The invention belongs to the field of steel strip control in hot rolling, and in particular relates to a method for preventing hot rolling layers from chasing steel on cold roller tables. Background technique [0002] To give full play to the production capacity advantages of hot rolling mills, it is required to maximize the production efficiency within the effective rolling time, and finally achieve high-efficiency production with the highest efficiency and the lowest consumption while ensuring product quality. The key link is the rolling line. Hourly output, and the specific parameter is the rolling rhythm. [0003] In order to increase the hourly output of the rolling line, it is necessary to increase the rolling rhythm of the strip steel, but the premise is to ensure that the strip steel does not chase steel on the rolling line, so as to ensure the accuracy of tracking and normal setting. [0004] The tracking of strip steel on the hot rolling pro...

AI Technical Summary

Problems solved by technology

[0010] Usually, the rolling rhythm of the strip steel is guaranteed by human control. From the extraction from the heating furnace to the entrance area of ​​the finish rolling, since the rolling speed of the rough rolling and the speed of the roller table are relatively fixed, so In terms of gap time, personnel are relatively easy to control, and the rhythm is more accurate; but for the finishing rolling and coiling area, due to the process of rising speed rolling in finishing rolling and slowing down coiling in coiling process, and even for strips of the same specification, due to different process control requirements, there are certain differences in the acceleration of the rising speed and the deceleration rate of the falling speed, so it is difficult for personnel to accurately control the gap time, and often When the gap between rolling rhythms is short, the front and rear strips chase each other head to tail on the layer cooling roller table, resulting in accidents such as strip scrapping and production line shutdown, which have brought great harm to normal production and organization. Impact

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