automatic vertical storage and retrieval system
The chain or cable drive system in a typical automatic storage and retrieval system may consist of a pair of chains or cables
. One end of the each chain or cable is attached to opposite sides of the extractor, and the other end of each chain or cable is provided with a counterweight. The counterweight is used to compensate for the weight of the payload and to ease the strain on the motor drive during vertical displacement of the extractor. However, the extractor is vertically displaced in both a laden and an unladen condition and each payload differs in weight. Therefor, the effectiveness of counterweights in known automatic storage and retrieval system is limited. A payload weight of 500 pounds or more is not untypical in automatic vertical storage and retrieval systems. Because of the weight of such payloads, a danger of chain or cable breakage exists in known vertical storage and retrieval systems. Even if the chain or cable does not break, any stretching of the chain, cable or support members, even if slight, could cause a misalignment problem.automatic vertical storage and retrieval system
By: ericfu