The invention belongs to the technical field of engineering machinery, and provides a double-cylinder hydraulic system for a hoisting instrument and a crane, the double-cylinder hydraulic system comprises a double-oil-cylinder unit and a control valve unit, the double-oil-cylinder unit comprises a first-stage oil cylinder and a second-stage oil cylinder, a rod cavity of the first-stage oil cylinder is communicated with a rod cavity of the second-stage oil cylinder, and a rod cavity of the second-stage oil cylinder is communicated with a rod cavity of the first-stage oil cylinder; the control valve unit comprises a first reversing valve and a second reversing valve, the first reversing valve is used for selectively guiding system pressure oil to a rod cavity of the first-stage oil cylinder, the second reversing valve is used for selectively controlling one of a rodless cavity of the first-stage oil cylinder and a rodless cavity of the second-stage oil cylinder to return oil, and the other one of the rodless cavity of the first-stage oil cylinder and the rodless cavity of the second-stage oil cylinder builds pressure. According to the system, the two reversing valves are adopted for controlling oil inlet and oil return of the first-stage oil cylinder and the second-stage oil cylinder respectively, asynchronous and synchronous retraction control of the two-stage oil cylinders can be achieved, and therefore the telescopic mode of the two oil cylinders is increased.
本发明属于工程机械技术领域并提供一种用于起重器械的双缸液压系统及起重机,双缸液压系统包括双油缸单元和控制阀单元,双油缸单元包括一级油缸和二级油缸,一级油缸的有杆腔与二级油缸的有杆腔连通,控制阀单元包括第一换向阀和第二换向阀,第一换向阀用于选择将系统压力油导向一级油缸的有杆腔,第二换向阀用于选择控制一级油缸的无杆腔和二级油缸的无杆腔的其中一者回油,另一者憋压。本系统通过采用两个换向阀来分别对一级油缸和二级油缸的进回油进行控制,可实现两级油缸的非同步和同步回缩控制,从而增加双油缸的伸缩模式。
Double-cylinder hydraulic system for hoisting apparatus and crane
用于起重器械的双缸液压系统及起重机
2024-12-20
Patent
Electronic Resource
Chinese
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