Flow regeneration energy saving system of hydraulic excavator boom
                                                                                    ZHOU Zhiyong
              (Department of Construction Machinery, Shanxi Traffic Vocational and Technical College, Taiyuan 030031, China)

Abstract: Aiming at the problem of flow regeneration of hydraulic excavator boom, the flow regeneration energy saving system of hydraulic excavator boom was researched. The simulation model of the flow regeneration system was built based on AMESim. The piston displacement, the piston velocity, the pressure and flow curves of boom cylinder and the regeneration flow curves were obtained through simulation respectively. The piston displacement and velocity curves of boom cylinder were compared and simulated when the system has the flow regeneration valve or not. At last, the influence of the flow regeneration valve opening pressure and back pressure on the small cavity of boom cylinder on the dynamic characteristics of flow regeneration system was studied and researched. The results show that the piston outward velocity of boom cylinder for the flow regeneration energy saving system can be increased to 0.34 m/s. When the flow regeneration valve opening pressure increases, the pressure on the large chamber of boom cylinder increases, but the piston speed of boom cylinder decreases. When back pressure on the small chamber of boom cylinder increases, piston speed of boom cylinder decreases, and the system regeneration flow decreases.

Key words: flow regeneration system; boom; AMESim; dynamic performances; opening pressure; overflow area