Soft-measuring method for tension of band steel between rollers of continuous annealing unit

Abstract

The invention discloses a soft-measuring method for the tension of band steel between rollers of a continuous annealing unit, comprising the following steps of: (1) acquiring process data; (2) preprocessing the process data; (3) constructing a soft-measuring model for combining a cascade observer with a neural network compensator; and (4) correcting the model. The moment current of a frequency converter corresponding to each roller between two tension measuring instruments, the speed and the boundary tension of each roller are used as the input quantity, the tension between every two rollers is calculated by the recursion in a cascade manner by adopting a frequency domain observer arithmetic, thus the indirect calculation and measuring on the tension of the band steel at the position where no tension measuring instrument is installed can be better realized, a favorable means is provided for the stability monitoring of the operation condition of the continuous annealing unit, high-precision calculation on the tension of the band steel at the position where no tension measuring instrument is installed is realized relatively accurately through compensating the nonlinear process characteristic and the unmodeled dynamics by applying a main model and neural network method, and a basis can be provided for the optimization on the control process parameter of tension in the continuous annealing unit.

Description

Technical field [0001] The invention relates to a tension detection method, in particular to a soft measurement method using computer technology to replace hardware with software, in particular to a soft measurement method for strip tension between any rolls of a continuous annealing line. Background technique [0002] Strip tension detection technology during continuous strip annealing process can provide reliable and stable operation of continuous withdrawal unit, prevent strip breakage, and improve strip running speed and strip product quality, and give full play to the production capacity of the equipment to meet various new requirements. Craftsmanship and modern production management are very important. [0003] In the current strip production process, in order to maintain continuous and stable operation, the continuous annealing line adopts tension closed loop control, such as furnace zone tension control, which is realized by tension loop and speed loop cascade control, such...

AI Technical Summary

Problems solved by technology

In this patent model, the elastic coefficient of the strip is directly used as a model parameter, but in actual conditions, it is different everywhere, and the movement of the strip and factors related to temperature make this parameter often change (compared with the characteristics of the roll, the strip steel properties are more unstable), and difficult to estimate, thus introducing model error

In addition, the model directly takes the roller inertia as the model parameter, without considering the influence of the motor and strip steel on the overall inertia, and the influence of bearing friction is not considered in the roller moment balance formula

In addition, the tension fluctuation caused by the eccentricity of the roller has a great influence, and it is difficult to obtain a practical result for judging the state of the unit if it is directly applied without treatment

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