After the oriented silicon steel is decarburized annealed in a continuous furnace, the upper lower surfaces of the strip steel need to be uniformly coated with magnesium oxide coating liquid. Magnesium oxide mainly acts as a release agent to prevent the strip steel sticking during the high temperature annealing stage. At the same time, it can remove impurities such as nitrogen sulfur in the steel. In addition, it also reacts with the silicon dioxide on the surface of the silicon steel to form an excellent magnesium silicate insulating underlayer . Therefore, the coating quality of magnesium oxide coating liquid on the surface of oriented silicon steel plays a vital role in the quality of silicon steel products. Talc Factory
At present, the magnesium oxide coating liquid is coated by a two-roll coater. The two-roll coating machine includes an upper coating roller, a lower coating roller, a tray, a magnesium oxide coating liquid circulating device, a nozzle that sprays the magnesium oxide coating liquid in the magnesium oxide coating liquid circulating device to the upper surface of the strip steel The undercoating roller is immersed in the tray, the magnesium oxide coating liquid sprayed by the nozzle on the upper surface of the strip overflows into the tray. The undercoating roller uses the magnesium oxide coating liquid in the tray for the lower surface of the strip Of coating.
However, due to the magnesium oxide coating solution in the process of coating recycling, the magnesium oxide solution in the tray does flow smoothly, the magnesium oxide reacts with water to form magnesium hydroxide precipitates. The magnesium hydroxide combines with carbon dioxide in the air to form easily precipitated Magnesium carbonate. Magnesium carbonate magnesium hydroxide have poor fluidity are prone to agglomeration deposition. Therefore, the fluidity of the coating liquid in the tray is high. As time goes by, the coating liquid is easy to accumulate scale, resulting in poor coating quality of the lower coating roller, large narrow batches of different sizes quantities appear along the strip rolling surface. Double lines abrasion of the lower coating roller directly cause product quality defects. In severe cases, it is necessary to stop the machine to replace the coated roller, clean the blockage of the circulation pipe, deal with the scale of the tray. On the one hand, these unfavorable factors greatly increase the labor intensity of employees, on the other hand, they interfere with the continuous production on site, which directly affects production efficiency. At the same time, the cured magnesium oxide coating solution cannot be used because it is stuck in the tray, which is only difficult to clean. , But also cause waste of magnesium oxide. In addition, due to the liquid thrown at the edge of the coating roller, the coating quality is affected, the work of the coating machine is disturbed at the same time, which causes fouling on the edge of the coating roller uneven coating on the edge of the strip.
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Factory Address: Yangfang Development Zone, Dashiqiao City, Liaoning Province