The invention relates to a hydraulic system, a control method thereof and a crane. The hydraulic system comprises a hydraulic oil tank, a pump, a first multi-way valve, a second multi-way valve and a switching valve set. The first multi-way valve comprises a first inlet, a first outlet, a three-way flow valve and a load sensitive port communicated with the load end of the three-way flow valve; an inlet and an outlet of the three-way flow valve are respectively communicated with the first inlet and the first outlet; the second multi-way valve comprises a second inlet and a second outlet; the switching valve group comprises a two-position two-way valve and a one-way valve; the hydraulic oil tank is communicated with the first inlet and an inlet of the two-position two-way valve through a pump, an outlet of the two-position two-way valve is communicated with the second inlet, and the second inlet is in one-way connection with the load sensitive opening through the one-way valve. The single pump and the switching valve group are adopted, so that the cost can be saved to a certain extent, the installation and the spatial arrangement are convenient, and the problems of system heating, noise generation and the like caused by energy loss due to overlarge flow of the second multi-way valve can be effectively avoided.
本公开涉及一种液压系统及其控制方法和起重机,该液压系统包括液压油箱、泵、第一多路阀、第二多路阀和切换阀组;第一多路阀包括第一进口、第一出口、三通流量阀和与三通流量阀的负载端连通的负载敏感口;三通流量阀的进口、出口分别与第一进口、第一出口连通;第二多路阀包括第二进口和第二出口;切换阀组包括二位二通阀和单向阀;液压油箱通过泵分别与第一进口和二位二通阀的进口连通,二位二通阀的出口与第二进口连通,且第二进口通过单向阀单向连接于负载敏感口。本公开采用单泵和切换阀组,能够在一定程度上节省成本,方便安装和空间布置,还能够有效避免第二多路阀因流量过大而产生的能量损失、造成系统发热、产生噪声等问题。
Hydraulic system, control method thereof and crane
液压系统及其控制方法和起重机
2024-11-22
Patent
Electronic Resource
Chinese