1. Select the suitable rack steel material
Low temperature environment has specific requirements for the application of steel, and should have good low temperature toughness and ductility to avoid brittle failure. Common carbon structure steel Q235 commonly used in the rack, Q235A, Q235B, Q235C, Q235D, Q235E in different grades, mainly because the impact temperature varies. 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, and the difference of impact temperature in their respective properties.
Secondly, the common carbon structure steel A/B/C/D also represents the different content of traces elements. Because of the different content of trace elements, the quality grade of A/B/C/D is getting higher and higher, and the performance of the low temperature is getting better and better. Under normal circumstances, Q235D will be used as the main material for cold storage racks. The manufacture of fasteners is usually made of high nickel chromium (such as Cr18Ni9 type) alloy steel or nonferrous metal (such as copper and aluminum) in low temperature environment, which almost do not show low temperature brittleness. The thermal expansion coefficient of steel material is 1.2 x 10 5/ C, and the thermal expansion coefficient of concrete is about 0.7 x 10 5/ C, which is close to each other, and can be effectively connected when the temperature difference is within 40 degrees C.
2. Select the appropriate racking system
Choosing the right rack system for customers to reach the maximum warehouse utilization per foot per cubic meter is the factor that the rack supply enterprises need to consider. The following are several common types of cold storage racks:
The common shuttle rack system, drive in rack and other racking types, such as the double depth pallet rack, push backrackand gravityrack, are selected mainly according to the different requirements of the customers.
3. Choose the proper way of surface treatment
Powder coating is the most common form of rack surface treatment. The cold storage is not very harsh for anticorrosion and rust prevention. It has good applicability and is economical and practical.
Compare with powder coating, hot-dip galvanizingcosts more about 40%. Hot dip galvanizing is to immerse the steel after rust removal into molten zinc at about 500 degrees, so that the surface of the steel member can be attached to the zinc layer, thereby preventing corrosion. If customers have higher requirements for anticorrosion and rust prevention and are not sensitive to cost, hot galvanizing can be used for surface treatment.
In many cases, it can be handled flexibly. According to the specific conditions, different surface treatment methods are adopted to achieve the optimal solution, such as the entry system, the main rack is sprayed on the main rack, and the ground guide can be hot-dip galvanized to achieve the best cost advantage and use effect.
4. Other considerations
Other factors should be considered in the design of cold storage racks, such as the selection of welds in the cold storage, which should correspond to the material and welding process requirements of the welded material and ensure the welding quality of the weld. The characteristics of frost in the cold storage should be considered. The weight gain should be considered properly when calculating the selection of racks, and the corrosion resistance requirements of the customer refrigeration and defrosting process on the structure spray coating should be considered.
For each project, whether the above factors are considered or considered economically and reasonably should be analyzed according to specific circumstances. Combining with engineering practice, Hercules understands and responds to the actual needs of customers, and wholeheartedly creates economic benefits for customers, which is the fundamental purpose of engineering design.
Welfor is specialized in producing various pallet rack, cantilever rack, medium duty rack, mezzanine and platform, slotted angle shelving, push back rack, longspan rack, rivet rack, drive in rack, carton flow rack, stacking rack and other related storage equipment.
Welfor strictly implements ISO9001, FEM10.2.02, SEMA, AS4084 and RMI standard in all operations. Welfor offers a wide range of products to meet all of your order fulfillment & material handling needs: pallet rack and cantilever rack. Whether you are looking to populate an entire warehouse or you are in need of a single piece of equipment, Welfor has a solution for you.