Shelf mobile device is a heavy-duty power rack-driven bench, bench can be horizontal or vertical movement, in order to save channel space. Operation from the control panel, open the reservoir to access digital channels, so that access to goods entering the forklift. Characteristics: 1, storage shelves and more than two-thirds of the traditional space. 2, the utilization rate of the ground 80 ℅. 3, space efficiency is about 70 ℅. 4, direct access, without the limitation of FIFO.