ThefuturehydraulicexcavatorsavingenergyinthefutureZHUYushu液压挖掘机自国产化以来至今已经历了1／3多个世纪、其间从初期的定量泵＋换向阀这种简单的系统结构发展成为包括泵、流量压力控制转换阀及电挂式内燃机在内的商店复杂的抑制系统，经历了数次的节能化进程。但是在? ThefuturehydraulicexcavatorsavingenergyinthefutureZHUYushu Hydraulic excavators have been in production for more than a century now, from simple systems such as initial metering pumps and directional control valves to those that include pumps, flow pressure control changeover valves, and electric-mounted internal combustion engines Complex suppression systems, including stores, have undergone several energy-saving processes. But when?