Also known as fluent type shelf, fluent rack: the goods is on the wheel, using the side channel inventory, the other side of the channel. Rack tip down in the direction of the shipment, the goods under the action of gravity sliding down. Can realize fifo, and can achieve a replenishment, picking for many times. Fluent rack storage efficiency is high, suitable for a large number of short-term storage of the goods. Widely used in network distribution centers, cargo operation, press and a high degree of automation of the factory.