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It adopts air-cooling technology structure design and is used in conjunction with the sliding gate mechanism. It is used in the steelmaking continuous casting section. During use, it is subjected to close heat radiation from the molten steel in the tundish and the ambient temperature is ≥450℃. Therefore, an air-cooling system is used to increase the service life of the hydraulic cylinder and effectively reduce the temperature around the seals of the cylinder. It has stable performance and is widely used.