The purchasing process of the racking system mainly includes the requirements of the warehouse to propose the warehouse racking system - the supplier design and selection of the scheme - the scheme discussion and optimization - the rationality of the scheme, the evaluation of the optimization degree - the quotation - the supplier selected - Contract signing - detailed technical design of the racking system - manufacturing of the racking system (preparation, processing, surface treatment, packaging, etc.) - shelf system installation - acceptance. The choice of shelves depends on the type of products and the size, weight and quantity of the products; the products with many types of light bulk goods are mostly made of light angle steel frame, carton type, box type products, which are selected from medium-sized shelves or three-post shelves. Shelf length can be made from 1.2 meters to 2.5 meters, single box can be placed in multiple boxes, turnover box, and utensils. There are some irregular products on the attic platform, large and lightweight products, most of which are too large in area, and the attic platform is originally a layer of floor installed on the original ground, which greatly saves the storage site. Increased utilization of high-altitude; double-deck attic shelves are mostly used for parts storage and small items distribution, parts library, heavy-duty shelves are mostly used in the electronics industry, paper industry, various industries, pay attention to the load-bearing performance of the shelves when using the shelves, Heavy-duty shelves are used for large storage and storage of products in trays, which can save high-altitude space. Customer requirements for warehouse racking systems should generally include warehouse floor plans, unit (package) cargo specifications, characteristics, weight, pallet cargo specifications, stack height and load capacity, access methods (manual, mechanical, automated access) and equipment , in and out of the library frequency, management system requirements, control methods, etc.