An energy recovery system for a hydraulic crane

In this paper an energy recovery system for a hydraulic crane is presented. An assistant system with an accumulator is used to drive one joint of an e xample crane together with an electro-hydraulic load-sensing (ELS) system. The practical system is tested. The hydrostatic analysis of energy transfer is based on the experimental process and an assumed typical duty cycle. Th e experimental and theoretical results show that the application of the ass istant system with the ELS crane system can recover and reutilize energy, s ave pump supply energy and improve energy utilization of the crane system. The success of its design and test in an example hydraulic crane will encou rage its extension to different commercial applications in other lifting ma chinery.