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Hydraulic system, hydraulic shovel, and method for controlling hydraulic shovel
This hydraulic system is provided with: a main hydraulic circuit comprising an open circuit having a main pump, a working machine cylinder, a main valve for controlling the inflow of hydraulic oil from the main pump to the working machine cylinder, and an oil tank, the hydraulic oil flowing out from the working machine cylinder being discharged to the oil tank via the main valve; a swing hydraulic circuit comprising a closed circuit having a swing pump, a swing motor, and a neutral holding valve for controlling the passage of hydraulic oil between the swing pump and the swing motor; a back pressure valve that is disposed in a tank flow path between the main valve and the tank and that adjusts the back pressure of the main valve; a warm-up flow path disposed around the valve body of the neutral holding valve; a supply flow path connecting an upstream portion of the tank flow path between the main valve and the back pressure valve and an inlet port of the warm-up flow path; and a discharge flow path that connects the downstream portion of the tank flow path between the back pressure valve and the tank and the outlet port of the warm-up flow path. When the temperature is low, the back pressure valve is set to a second set pressure, and warm oil warmed by the overflow operation of the main valve is supplied to the warming circuit of the neutral holding valve, thereby promoting the warming of the neutral holding valve.
本发明的液压系统具备：主液压回路，其由具有主泵、作业机缸、主阀及油箱的开放式回路构成，所述主阀用于控制液压油从主泵向作业机缸的流入，从所述作业机缸流出的液压油经由所述主阀被排出到所述油箱；回转液压回路，其由具有回转泵、回转马达及中立保持阀的封闭回路构成，所述中立保持阀用于控制回转泵与回转马达之间的液压油的通过；背压阀，其配置于主阀与油箱之间的油箱流路，用于调整主阀的背压；暖机流路，其配置于中立保持阀的阀芯周围；供给流路，其将主阀与背压阀之间的油箱流路的上游部分和暖机流路的入口端口连接；以及排出流路，其将背压阀与油箱之间的油箱流路的下游部分和暖机流路的出口端口连接。低温时，将背压阀设为第二设定压力，将通过主阀的溢流操作而暖机的温热的油供给到中立保持阀的暖机回路，由此促进中立保持阀的暖机。
Hydraulic system, hydraulic shovel, and method for controlling hydraulic shovel
This hydraulic system is provided with: a main hydraulic circuit comprising an open circuit having a main pump, a working machine cylinder, a main valve for controlling the inflow of hydraulic oil from the main pump to the working machine cylinder, and an oil tank, the hydraulic oil flowing out from the working machine cylinder being discharged to the oil tank via the main valve; a swing hydraulic circuit comprising a closed circuit having a swing pump, a swing motor, and a neutral holding valve for controlling the passage of hydraulic oil between the swing pump and the swing motor; a back pressure valve that is disposed in a tank flow path between the main valve and the tank and that adjusts the back pressure of the main valve; a warm-up flow path disposed around the valve body of the neutral holding valve; a supply flow path connecting an upstream portion of the tank flow path between the main valve and the back pressure valve and an inlet port of the warm-up flow path; and a discharge flow path that connects the downstream portion of the tank flow path between the back pressure valve and the tank and the outlet port of the warm-up flow path. When the temperature is low, the back pressure valve is set to a second set pressure, and warm oil warmed by the overflow operation of the main valve is supplied to the warming circuit of the neutral holding valve, thereby promoting the warming of the neutral holding valve.
本发明的液压系统具备：主液压回路，其由具有主泵、作业机缸、主阀及油箱的开放式回路构成，所述主阀用于控制液压油从主泵向作业机缸的流入，从所述作业机缸流出的液压油经由所述主阀被排出到所述油箱；回转液压回路，其由具有回转泵、回转马达及中立保持阀的封闭回路构成，所述中立保持阀用于控制回转泵与回转马达之间的液压油的通过；背压阀，其配置于主阀与油箱之间的油箱流路，用于调整主阀的背压；暖机流路，其配置于中立保持阀的阀芯周围；供给流路，其将主阀与背压阀之间的油箱流路的上游部分和暖机流路的入口端口连接；以及排出流路，其将背压阀与油箱之间的油箱流路的下游部分和暖机流路的出口端口连接。低温时，将背压阀设为第二设定压力，将通过主阀的溢流操作而暖机的温热的油供给到中立保持阀的暖机回路，由此促进中立保持阀的暖机。
Hydraulic system, hydraulic shovel, and method for controlling hydraulic shovel
液压系统、液压挖掘机、以及液压挖掘机的控制方法
SUMINO WATARU (author) / KOZUKA DAISUKE (author) / HASEBE AKIRA (author) / IKEDA MASATOSHI (author)
2024-04-12
Patent
Electronic Resource
Chinese
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