Under normal circumstances, the shelf varieties generally have storage shelves, light shelves , gravity racking systems , mobile shelving systems which several common species. The most common are storage shelves, it is mainly used in the warehouse , typically placed heavy items , and many more pallets or crates to be stored on the shelf.
In general , as the common varieties shelves , light shelves can be widely used in factories and enterprises , shops , offices , kitchens and so on. Such shelves are opposed to " pallet racking " is concerned , the general human direct access to the goods in the shelves, height and depth of the goods and therefore are relatively small, and the load on each shelf lighter . Generally , this type of shelf uprights using cold-formed sheet steel punched , it is generally triangular in cross-section , it is also called " perforated angle steel shelf ." In order to improve the load , there could be a square cross-section was open . There are connections between the shelf components bolted and plug in both cases .
Apart from the variety of shelves , shelf systems gravity well , and each channel on the shelves are installed in a slope , with a guide rail , so that the goods storage means under the action of gravity, into the library side has been flowing out of the library client.