The full name of the stacker is the aisle-type stacker crane, which is the main storage and retrieval equipment in automated warehousing systems. It can move horizontally and vertically along the aisles between three-dimensional racks according to computer instructions, using forks to retrieve or store goods from the cargo compartments. The operational requirements are fulfilled by three driving mechanisms: travel, lifting, and fork. It employs internationally advanced servo control systems and absolute addressing systems for fully closed-loop control, combined with high-precision addressing methods such as barcodes or laser ranging, to achieve high-precision operation of the stacker.