The scraped surface heat exchanger is short for SSHE, which is a very popular heat exchanger in the food and beverage processing field. The heater consists of a material barrel, a heating or cooling medium jacket, a stirrer and a shaft seal. The scraper of the stirrer is fixed on the stirring shaft with positioning pins. When the shaft rotates at a high speed, it will be close to the wall in the material barrel due to centrifugal force and fluid resistance, continuously scrape off the covering film