Stacker CranesStacker cranes have mechanisms similar to forklifts that move on vertical or horizontal tracks to transfer large unit loads from storage to delivery stations. They are part of automated computer warehouse retrieval systems referred to as an automated storage and retrieval system (AS/RS). They are often used in hazardous environments like freezer warehouses and frozen food manufacturers so workers don’t have to endure cold working conditions. They help maximize vertical storage space volume instead of floor area because they can travel to much higher heights than their alternative, forklift trucks. Stacker cranes are able to operate in aisles 6 to 8 feet wide, and retrieve large units of containers, trays and pallets. AS/RS systems are used when there are high volumes of loads moving in and out of storage and saving space is important. Stacker cranes are an integrated and important component of AS/RS systems. They generally need minimal human worker interaction, and therefore have high accuracy. There are 3 types of operational modes for stacker cranes, which are built between the aisles of AS/RS, which are available for warehouse storage facilities. Automatic stacker cranes receive movement commands via PC/PLC concentrators. Semi-automatic systems move by numerical setters that determine the X and Y coordinates of the object being moved. Manual stacker cranes use operators that push buttons which move the cranes up and down or back and fourth at slow speeds.
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