Coating machine for coating silicon-steel magnesium oxide coating liquid

Abstract

The invention discloses a coating machine for coating silicon-steel magnesium oxide coating liquid. The coating machine comprises a frame, an upper coating roll, a lower coating roll, a magnesium oxide coating liquid circulating device and a nozzle pipe, and also comprises a coating liquid drainage apparatus and a baffle, wherein the coating liquid drainage apparatus is arranged on one side of the lower coating roll and installed on the frame; the coating liquid drainage apparatus at least comprises one bottom plate; the side of the bottom plate, which is towards the lower coating roll, adopts a drainage side; the other sides of the bottom plate adopt collecting sides; the width of the bottom plate of the coating liquid drainage apparatus is larger than the width of strip steel arranged between the upper coating roll and the lower coating roll; the drainage side of the liquid drainage apparatus is used for draining magnesium oxide coating liquid overflowing from the upper surface of the strip steel to the lower coating roll; and the baffle is arranged below the nozzle pipe and arranged on the upper surface of the strip steel in an inclined way. The coating machine has the benefits that the magnesium oxide coating liquid overflowing from the surface of the strip steel is directly drained to the lower coating roll through the coating liquid drainage apparatus, the flowability of the coating liquid is good, the leveling of the coating liquid coating the surface of the strip steel is uniform, and the continuous production efficiency and the material yield of oriented silicon steel are improved.

Description

technical field [0001] The invention belongs to the field of steel strip coating, and in particular relates to a coating machine for coating magnesium oxide coating liquid on silicon steel. Background technique [0002] After the grain-oriented silicon steel is decarburized and annealed in a continuous furnace, it is necessary to uniformly coat the upper surface and the lower surface of the steel strip with a magnesium oxide coating solution. Magnesium oxide mainly acts as a spacer to prevent strip steel from sticking during high-temperature annealing. At the same time, it can remove impurities such as nitrogen and sulfur in the steel. In addition, it also reacts with silicon dioxide on the surface of silicon steel to form an excellent magnesium silicate insulating bottom layer. . Therefore, the coating quality of magnesium oxide coating solution on the surface of grain-oriented silicon steel plays a vital role in the quality of silicon steel products. [0003] At present,...

AI Technical Summary

Problems solved by technology

[0004] However, due to the magnesia coating liquid in the coating recycling process, the flow of magnesia solution in the tray is not smooth, magnesia reacts with water to form magnesium hydroxide precipitation, and magnesium hydroxide combines with carbon dioxide in the air to form easily precipitated 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. As time goes by, the coating liquid is prone to accumulation and fouling, resulting in poor coating quality of the lower coating roller, and there are gaps of different widths and quantities in batches along the strip rolling to the plate surface. Double lines, and the lower coating roller is worn, directly causing product quality defects

In severe cases, it is necessary to stop the machine to replace the coating roller, clean the blockage of the circulation pipe, and deal with the fouling of the tray, etc.

On the one hand, these unfavorable factors have greatly increased the labor intensity of the workers, on the other hand, they have interfered with the continuous production on site and directly affected the production efficiency. At the same time, since the cured magnesia coating liquid is stuck in the tray and cannot be used, it is not only difficult to clean , but also cause waste of magnesium oxide

In addition, the coating quality is affected due to liquid rejection at the edge of the coating roller, and at the same time 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

Images