Hot continuous rolling mill steel strip threading deviation tension control method and control system thereof

Abstract

The invention discloses a hot continuous rolling mill steel strip threading deviation tension control method and a control system thereof, relates to control equipment or methods special for metal rolling mills or products thereof, and particularly relates to the technology of utilizing loops to realize hot rolled steel strip tension control. A steel strip tension control system comprises a frame deviation tension setting unit, a frame deviation tension control unit and a servo valve deviation compensating unit. The hot continuous rolling mill steel strip threading deviation tension control method includes the steps of receiving steel strip parameters and set tension values; determining a deviation tension target of the frame and converting the same into set torque and carrying out proportional output control on a electro-hydraulic servo valve; measuring current actual tension of the loops; judging whether the loops are in contact with a steel strip or not; and carrying out secondary tension determination and multi-stage tension control. As action deviation of servo valves is compensated, precise control of openings of the servo valves and steel strip deviation tension is realized. Therefore, the technical problem about deviation tension control of the steel strip when the head of the steel strip is fed to the frame is solved, and tension control stability of the hot continuous rolling mill steel strip threading loops is improved greatly.

Description

technical field [0001] The invention relates to a control device or method specially suitable for a metal rolling mill or its processed products, in particular to a method and a control system for realizing tension control of a hot-rolled strip through loopers. Background technique [0002] In hot continuous rolling production, the strip tension between stands has a great influence on stable strip threading and product quality. In the actual rolling process of the hot-rolling tandem rolling mill, after the steel strip is bitten in the racks, a certain tension will be formed on the strip steel between the front and rear racks, which is used to tension the strip steel that appears between the racks, so that The strip between the adjacent stands of the continuous rolling mill maintains a certain tension. Tension is one of the most important control parameters in the finishing rolling area of ​​hot rolling. If the tension is too high, the strip will be narrowed locally, resulti...

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a method for controlling the strip tension of the hydraulic looper. By detecting the actual tension of the looper during the frame biting process and dynamically adjusting and correcting the deviation target tension, the strip tension can be realized. The deviation tension control can solve the technical problem of the deviation tension control of the strip steel in the process of rack bite

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