The full name of stacker crane is aisle stacker crane, which is the main access equipment in automated warehousing systems. It can walk horizontally and vertically in the aisle between the three-dimensional shelves according to computer instructions, and use forks to take out or store goods on the shelves. The operation requirements are completed by three driving mechanisms: walking, lifting, and fork. The internationally advanced servo control system and absolute addressing system are used for full closed-loop control, combined with high-precision addressing methods such as barcode or laser ranging, to achieve high-precision operation of the stacker crane.