The invention relates to the field of cranes, and provides a single-cylinder bolt telescopic control system, a cargo boom and a crane, the single-cylinder bolt telescopic control system comprises a telescopic oil cylinder, a telescopic control valve and an electric proportional overflow valve, a first working oil port of the telescopic control valve is connected with a rod cavity of the telescopic oil cylinder, and a second working oil port of the telescopic control valve is connected with a rodless cavity of the telescopic oil cylinder; an oil inlet of the telescopic control valve is connected with the pressure oil way, an oil return opening of the telescopic control valve is connected with the oil return way, one end of the electric proportional overflow valve is connected with the pressure oil way, and the other end of the electric proportional overflow valve is connected with the oil return way. In this way, by setting the overflow pressure of the electric proportional overflow valve, proportional control can be conducted on the telescopic pressure, the problem that starting impact abnormal sound is generated when the pin is inserted into the pin hole is solved, and the motion smoothness of the large arm is improved.
本发明涉及起重机领域,提供一种单缸插销伸缩控制系统、起重臂及起重机,包括伸缩油缸、伸缩控制阀和电比例溢流阀,伸缩控制阀的第一工作油口连接伸缩油缸的有杆腔,伸缩控制阀的第二工作油口连接伸缩油缸的无杆腔,伸缩控制阀的进油口连接压力油路,伸缩控制阀的回油口连接回油油路,电比例溢流阀的一端连接压力油路、另一端连接回油油路。如此设置,通过设置电比例溢流阀的溢流压力,能够对伸缩压力进行比例控制,避免了销插入销孔时产生的启动冲击异响的问题,提升了大臂的运动平顺性。
Single-cylinder bolt telescopic control system, cargo boom and crane
单缸插销伸缩控制系统、起重臂及起重机
2024-05-24
Patent
Elektronische Ressource
Chinesisch
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