(Department of Construction Machinery, Shanxi Traffic Vocational and Technical College, Taiyuan 030031, China)
Abstract: Aiming at the problem of the strong impact of hoist over discharge skip, the overdischarge energy absorption system of hoist was studied. A passive hydraulic energy absorption system was proposed and designed. The key parameters of energy absorption cylinder were calculated. The simulation model of overdischarge passive energy absorption system of hoist was built by AMESIM. The velocity displacement of skip and pressureflow characteristic curves on buffer chamber of energy absorption cylinder were obtained by simulation under initial parameters. The influence of piston diameter, relief valve diameter and spring compression on skip displacement and pressure on buffer chamber of energy absorption cylinder was studied. The results indicate that on the premise of the skip not hitting cylinder, smaller piston diameter of energy absorption cylinder, larger relief valve diameter and smaller relief valve compression are beneficial to reducing the peak pressure on buffer chamber of the energy cylinder and increasing the effective energy absorption of the passive energy absorption system.
Key words: hoist; overdischarge; passive; energy absorption; buffer displacement; pressure on buffer chamber