Steel band loop length calculating system

Abstract

The invention discloses a steel band loop length calculating system which comprises a programmable logic controller (PLC) and an absolute value encoder. The absolute value encoder measures the vertical height h between an upper roller and a lower roller of a loop and transmits a vertical height h signal to the PLC. The upper roller diameter r1, the lower roller diameter r2, a horizontal distance w between the centers of the two rollers and the total loop length n are recorded in the PLC. The steel band loop length is obtained through the PLC by utilizing the values. The system can eliminate tracking errors caused by inaccurate calculation of the loop length, improves the steel band tracking accuracy, the control accuracy of a whole control system and the stability of tension control, accordingly reduces occurrence rate of band breakage at the position of a straightening machine and meanwhile can improve the shearing and sizing accuracy.

Description

technical field [0001] The invention relates to the field of looper control and measurement of cold-rolled steel strips. Background technique [0002] At present, the large-scale processing line control system in the steel industry is mainly monopolized by foreign electric companies. The material tracking of the processing line plays an irreplaceable role in the production line as the scheduling center of the production of the processing line, and the accuracy of the length of the looper in the material tracking of the processing line It has a direct impact on the accuracy of the entire tracking, the control of the looper, and the adjustment of the tension. [0003] At present, most domestic steel strip processing lines mainly use foreign control systems, and the amount of loops used is an approximate calculation method. This approximate calculation method is an empirical method. This calculation method is used in large In most cases, the error of looper calculation can be ...

AI Technical Summary

Problems solved by technology

[0003] At present, most domestic steel strip processing lines mainly use foreign control systems, and the amount of loops used is an approximate calculation method. This approximate calculation method is an empirical method. This calculation method is used in large In most cases, the error of looper calculation can be eliminated by weld synchronization, which basically meets the production requirements; in some specific cases, such as the extension of the steel strip due to temperature changes in the annealing furnace, the weld synchronization function can no longer Eliminate the impact of looper calculation errors on tracking accuracy, resulting in that when the weld seam passes through the skin pass machine, the roll gap cannot be opened in real time, which is easy to cause belt breakage, and has a greater impact on the quality of the head and tail of the steel belt

At the same time, the outlet shear is also sheared according to the weld seam, which also affects the fixed-length shear of the finished coil

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