Pressure control method and pressure control device of silicon steel magnesium oxide coating

Abstract

The invention relates to the production field of silicon steel, in particular to a pressure control method and a pressure control device of a silicon steel magnesium oxide coating. The pressure control method comprises the following steps: a pressure feedback value after a pressure PID controller controls a coating machine is detected in real time; a dead zone interval of a pressure value is set, and whether the pressure feedback value falls into the dead zone interval is juaged through comparison; and when the pressure feedback value falls into the dead zone interval, the pressure PID controller is closed. The pressure control device comprises a monitoring unit, a comparing unit and a control unit; the monitoring unit monitors the pressure feedback value after the pressure PID controller controls the coating machine in real time; the comparing unit is provided with a dead zone interval of the pressure value, and compares whether the pressure feedback value falls into the dead zone interval; and the control unit closes the pressure PID controller after the pressure feedback value falls into the dead zone interval. With the adoption of the pressure control method and the pressure control device of the silicon steel magnesium oxide coating, pressure great fluctuation resulting from equipment proper properties when a screw rod motor adjusts the pressure can be avoided, the thickness uniformity of a coated magnesium oxide film is improved, and the quality of the silicon steel magnesium oxide coating is improved.

Description

technical field [0001] The invention relates to the field of silicon steel production, in particular to a pressure control method and device for magnesium oxide coating on silicon steel. Background technique [0002] In the production process of silicon steel, it is necessary to coat the strip steel after decarburization annealing with a magnesium oxide film, which is convenient to prevent the strip steel from sticking during the high-temperature annealing process in the subsequent process, and to form a magnesium silicate glass film. The quality of magnesium oxide coating directly determines the finished grade of silicon steel, which is very important in the whole silicon steel production process, and the pressure control of coating machine is the basis to ensure the uniformity of film thickness. The annealing line for silicon steel production adopts a two-roll coater, the upper roll is a support roll, and the servo motors on both sides of the lower roll drive the screw to ...

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Problems solved by technology

[0003] By providing a pressure control method and device for magnesium oxide coating on silicon steel, the present invention solves the problem that in the prior art, it is difficult to realize the micro-control of the force stably during the pressure control, and the control pressure value is prone to oscillate and deviate around the set value. The technical problem that cannot be reduced reduces the range of pressure value changes after closed-loop PID pressure control, and the beating frequency is uniform, avoiding large pressure fluctuations caused by the properties of the equipment itself when the screw motor adjusts the pressure, and improving the performance of the coated magnesium oxide film. Thickness uniformity, which in turn improves the quality of magnesium oxide coatings on silicon steel

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