The design of the cold storage shelf should consider the actual situation. Different types of cold storage have different factors for design consideration. There are different requirements for the material and steel structure of the high temperature cold storage and low temperature cold storage. Because some cold storage is used to store items, it is usually seasonal products such as fruits or fresh milk, and some are quick-frozen foods.
1. Choose the right shelf steel material. Low temperature environments have specific requirements for steel applications and should have good low temperature toughness and ductility to avoid brittle failure. The common carbon structural steel Q235 commonly used in the shelves has different grades of Q235A, Q235B, Q235C, Q235D and Q235E, mainly because the temperature of the impact is different. A means no impact, B is above 20 ° C, C is above 0 ° C, D is above -20 ° C, E is above -40 ° C, A to E is different, is the impact temperature of their respective properties s difference.
2. Ordinary carbon structural steel A/B/C/D also represents the content of trace elements. A/B/C/D has higher and higher quality grades due to different content of trace elements and its performance in low temperature. Performance is getting better and better. In general, Q235D will be used as the main material for cold storage shelves. The fasteners in the cold storage rack are usually made of high-nickel-chromium (such as Cr18Ni9 type) alloy steel or non-ferrous metal (such as copper, aluminum) materials in low temperature environment, and they hardly exhibit low-temperature brittleness. The thermal expansion coefficient of steel material is 1.2×10-5/°C; the thermal expansion coefficient of concrete is about 0.7×10-5/°C, which is relatively close, and can be effectively connected when the temperature difference is within 40°C.
The cold storage shelf should be designed according to the items placed on the top, and the designer can only make mistakes in the design process if he starts from the above two aspects. For iron shelves for goods such as vegetables and cold meat, the temperature should be controlled within the corresponding range, so it is required that the cold storage shelf should have corresponding capacity between this temperature.
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