The direct cooling type milk tank (refrigerating milk tank) is an imporant associated equipment for mechanical milking in the meadow, lt is also a freshness maintaining equipment specially designed for cooling and sloring liquid for dairy industries, dairyplants, cattle farrns, rik collection stations and other industries both in China and abroad, Through the ful-automatic computer control, the materials (fresh mik) are cooled and kept at constant temperature to prevent the growth of bacteria.