Please describe in simple language what you have seen in your life and the bookshelves for those purposes.

1, the attic shelf system is to build a middle attic on the existing workplace or shelf, and the attic shelf can increase storage space and can be used as a two-story or three-story attic; The access of some light bulbs and small and medium-sized goods is suitable for multi-variety and large-batch or multi-variety and small-batch goods, as well as manual access to goods. Goods are usually transported to the second and third floors by forklifts, hydraulic lifting platforms or freight elevators, and then transported to a certain location by light trucks or hydraulic pallet trucks;

2. Pallet shelves are used to store unitized pallet goods, and are equipped with storage and transportation machinery such as roadway stackers for operation;

3. Double-depth shelf series is derived from heavy-duty beam shelf, with simple structure and large storage capacity, which effectively relieves the storage demand that ordinary beam shelf can't meet, and the storage capacity is doubled compared with ordinary beam shelf;

4. Double-depth shelf series is derived from heavy-duty beam shelf, with simple structure and large storage capacity, which effectively relieves the storage demand that ordinary beam shelf can't meet, and the storage capacity is doubled compared with ordinary beam shelf;

5. Beam shelf is a kind of storage shelf, which belongs to heavy shelf. In fact, beam frame refers to selection frame, position frame, tray frame and so on.