Design of cold storage shelves need to consider the factors Design cold storage shelves, the first need to distinguish between cold storage. High temperature cold storage, the need to control the product temperature from 0 ℃ to 4 ℃ or 6 ℃, storage type of more products: vegetables, fruits, fresh milk, cold meat, etc .; low temperature cold storage, the need to control the product temperature - 18 ℃ or -20 ℃, storage type of more products: frozen meat; frozen food, such as quick-frozen dumplings, quick-frozen noodles; ice cream and so on. In the actual case, the common is -18 ℃ cold storage. Compared with the room temperature library, the shelf application in the cold storage, usually need to consider the following aspects of the design aspects:
1. Choose the appropriate shelf steel material.
Low temperature environment on the application of steel has specific requirements, should have good low temperature toughness and ductility, in order to avoid brittle damage. Commonly used in the common carbon structural steel Q235, Q235A, Q235B, Q235C, Q235D, Q235E different grades of points, mainly because the impact of the temperature is different. A is not the impact, B is above 20 ℃, C is above 0 ℃, D is above -20 ℃, E is above -40 ℃, A to E is different, their respective performance in the impact temperature s difference.
1.Choose the appropriate shelf surface treatment
Spray (epoxy polyester electrostatic powder coating) is the most common shelf surface treatment. For anti-corrosion requirements are not very stringent cold storage, applicability is very good, economical and practical. Relative to the spray, hot-dip galvanizing (hot-dip zinc and hot-dip galvanizing) costs higher, cost about 40% higher. Hot-dip galvanizing is the rust after the steel immersed in about 500 ℃ melting zinc solution, so that the steel surface attached to the zinc layer, which play a preservative.