The invention relates to the technical field of engineering machinery, and especially relates to a crane jib switching valve, a hydraulic control system equipped with the crane jib switching valve and engineering machinery, and concretely relates to the crane jib switching valve used for telescoping a crane jib. According to the invention, a shunting loop and an oil supplement loop are connected to the crane jib switching valve in a switching loop, various valves in the switching loop, the shunting loop and the oil supplement loop are integrated and arranged, switching of a first hydraulic cylinder and a second hydraulic cylinder can be controlled through electric control; when the first hydraulic cylinder is retracted, oil fluid in a first rod core and a second rod core enables backflow by the shunting loop, generation of moving phenomenon of a second jib can be effectively avoided; when the first hydraulic cylinder is extended, oil liquid supplement is carried out to the first rod core and the second rod core by the oil supplement loop, empty oil cylinder can be avoided, time-delay phenomenon of the second jib can be effectively avoided, work efficiency is increased, a structure of the whole crane jib switching valve is compact, and the installation and operation are convenient.
Crane jib switching valve, hydraulic control system and engineering machinery
2015-05-06
Patent
Electronic Resource
English
IPC: | B66C Krane , CRANES |
Cantilever crane hydraulic control system and engineering machinery
European Patent Office | 2023
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