After the grain-oriented silicon steel is decarburized and annealed in a continuous furnace, it is necessary to uniformly coat the upper and lower surfaces of the strip with a magnesia coating solution. Magnesium oxide mainly acts as a release agent. Haicheng magnesium oxide can prevent the strip steel from sticking during the high temperature annealing stage, and at the same time can remove impurities such as nitrogen and sulfur in the steel. In addition, it also reacts with the silicon dioxide on the surface of the silicon steel to form excellent silicon Magnesium oxide insulating bottom layer. Therefore, the coating quality of magnesium oxide coating solution on the surface of oriented silicon steel plays a crucial role in the quality of silicon steel products.

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At present, the magnesium oxide coating solution is applied by a two-roll coater. The two-roll coating machine includes an upper coating roll, a lower coating roll, a tray, a magnesium oxide coating liquid circulation device, and a nozzle for spraying the magnesium oxide coating liquid in the magnesium oxide coating liquid circulation device to the upper surface of the strip steel ;The lower coating roller is immersed in the tray, and the magnesia coating liquid sprayed by the nozzle on the upper surface of the strip overflows and enters the tray, and the lower coating roller uses the magnesium oxide coating liquid in the tray to carry out the lower surface of the strip steel. of coating.

However, because the magnesium oxide coating solution in the coating cycle is used, the magnesium oxide solution in the tray does not flow smoothly, and the magnesium oxide reacts with water to form magnesium hydroxide precipitation. Magnesium Carbonate. Magnesium carbonate and magnesium hydroxide have poor fluidity and are prone to agglomeration and deposition. Therefore, the fluidity of the coating liquid in the tray is not high, and over time, the coating liquid is prone to accumulation and fouling, resulting in poor coating quality of the lower coating roller, and the batches of width and quantity vary along the strip rolling to the plate surface. Double lines, and wear of the lower coating roller, directly cause product quality defects. In severe cases, it is necessary to stop the operation to replace the coating roller, clear the blockage of the circulation pipeline, and deal with the scaling of the tray. On the one hand, these unfavorable factors greatly increase the labor intensity of employees, on the other hand, they interfere with continuous on-site production, which directly affects production efficiency. At the same time, because the cured magnesium oxide coating solution is stuck in the tray and cannot be used, it is not only difficult to clean , and also cause waste of magnesium oxide. In addition, the coating quality is affected by the liquid splatter on the edge of the coating roller, which interferes with the work of the coating machine, resulting in fouling on the edge of the coating roller and uneven coating on the edge of the strip.