Lifting system and lifting method for jib of project machine and project machine thereof

摘要

A lifting system for a jib of an operating machine is disclosed in the present invention, An energy storage device comprising an energy storage cylinder (4) and an accumulator (7), said energy storage cylinder (4) comprising an energy storage piston rod (4) connected to an upper chamber (4a), a lower chamber (4b) 2), the upper portion of the accumulator (7) being filled with gas, the lower portion of the accumulator (7) being filled with hydraulic oil, and the accumulator being in communication with the lower chamber (4b) of the energy storage cylinder; A control cylinder 12 which controls lifting the jib 1 and includes a control piston rod 23 connected to the upper chamber 12a, the lower chamber 12b and the gib 1; As the hydraulic pump 9, when the hydraulic pump supplies oil to the upper chamber 12a of the control cylinder, the jib 1 descends and the weight of the jib pushes the energy storage piston rod 2 to the lower portion of the energy storage cylinder The hydraulic oil in the chamber 4b is pushed to the lower portion of the accumulator to compress the gas in the upper portion thereof to restore the potential energy and when the hydraulic pump supplies the oil to the lower chamber 12b of the control cylinder, Lifts the energy storage piston rod 2 and the compressed gas in the upper portion of the accumulator pushes the oil 19 in its lower portion into the lower chamber 4b of the energy storage cylinder to release the recovered potential energy And a hydraulic pump that lifts the jig by pushing the energy storage piston rod 2. The system efficiently recovers and recycles the potential energy of the descending jib, thereby saving energy and improving the operation efficiency of the jib. Also disclosed in the present invention is an operating machine having the lifting system and a method for lifting the jib using the lifting system.