Control method for preventing staggered layers of steel coils for coiler pinch roll of hot rolling production line

Abstract

The invention relates to a control method for preventing staggered layers of steel coils for a coiler pinch roll of a hot rolling production line, and belongs to the technical field of metallurgical plate production processes. According to the technical scheme, before finish rolling and steel throwing, a pressure is increased on the pinch roll on the side with a large roll gap, so that the roll gap of the pinch roll is kept balanced during the finish rolling and steel throwing. A program is reprogrammed in a first-stage PLC, the operation process that an operator presses a button is simulated,and automatic adjustment is conducted once every two seconds till a leveling pressure reaches a set leveling pressure value. The method has the advantages that a pinch roll pressure leveling technology is adopted, imbalance of the roll gap of the pinch roll is reduced, accordingly, tail protrusions caused by the lateral force of the pinch roll are eliminated, layer staggering of the tails of thesteel coils is prevented, and the method is efficient, safe, reliable, simple in programming, rapid and convenient to operate, economical and practical and saves spare part costs.

Description

technical field [0001] The invention relates to a method for controlling pinch rolls of a coiler in a hot rolling production line to avoid misalignment of steel coils, and belongs to the technical field of metallurgical plate production technology. Background technique [0002] At present, with the continuous upgrading of my country's industrial quality, customers have put forward higher requirements for the quality requirements of steel products. The coil shape quality of hot-rolled strip steel not only affects the product grade, but also affects the production of the next process. Improving the coil shape quality of steel coils is one of the important measures to reduce costs and increase efficiency. Coil shape quality refers to the flatness of the side of the coil. For hot-rolled strip steel, although the coil shape defect is only an appearance defect, a series of problems caused by it will cause a large amount of benefit loss. For example, defects in the coil shape of ...

AI Technical Summary

Problems solved by technology

However, after finishing rolling and steel throwing, the tension acting on the strip suddenly decreases, and the lateral force of the pinch roll is greater than the force required to push the strip, and the strip is then pulled toward the direction where the pinch roll has a larger opening. Pushed a certain distance, it will create a tower or tail boss

Images