A control method for automatically controlling the roll heating rhythm after roll change of a rolling mill

Abstract

The application discloses a control method for automatically controlling a roll heating rhythm after roll changing of a rolling mill, comprising the following steps: establishing a roll heating rhythm control parameter table of the rolling mill and setting the parameters; during roll changing of a finishing mill, the system detects a roll changing completion signal and triggers automatic roll heating function execution; collecting and correcting actual steel tapping duration of a heating furnace; calculating conveying duration of a slab from a furnace roller way to an entrance of a rough rolling mill; calculating a steel tapping countdown based on control parameters, the steel tapping duration, the conveying duration and an adjustment duration; starting the countdown based on the calculation result, and when the countdown is 0, the system sends a steel tapping permission signal to a PLC, and the heating furnace starts a steel tapping operation; after the number of tapped slabs of the heating furnace reaches a set roll heating number, the system automatically switches to normal production rhythm for production. The application maximally reduces the workload of an operator, simultaneously enables the roll to have an optimal thermal crown state and an oxidation film thickness in production, improves strip shape quality and reduces roll consumption.

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