With the continuous increase of quick-frozen food sales, more and more food processing enterprises need to upgrade or expand their own freezing and cooling production lines. As Quick Freezing Equipment enterprises all know the very important links in food processing, production and distribution during freezing and cooling, the quick-freezing equipment and technology are undergoing earth-shaking changes at present. It is not as simple as imagined to upgrade and expand the production line. Although traditional quick-freezing equipment is still widely used in many food processing industries, under the new form, new-type freezing equipment with many advantages is gradually replacing the traditional equipment. The latest modern quick freezing equipment is IQF Freezing that uses liquid nitrogen as raw material to freeze food. Liquid nitrogen is an ultra-low temperature refrigerant, which is characterized by non-inertness, colorless, tasteless, non-corrosive and non-combustible. The temperature of liquid nitrogen is extremely low, the boiling point is-196℃, and the refrigeration principle is to use the heat absorbed in the gasification process to rapidly reduce the temperature of the contacted food. The main raw material of this technology is air, so there is no toxic substance in liquid nitrogen, and after vaporization, it will not have any impact on the safety of frozen and cooled food, the environment and the health of personnel....