The invention discloses a hydraulic control moment restriction system of a folding arm lorry-mounted crane. A first amplitude variation control group, a second amplitude variation control group and a stretching control group are respectively communicated with a unidirectional balance valve, a first bidirectional balance valve and a second bidirectional balance valve which are respectively communicated with a first amplitude variation oil cylinder, a second amplitude variation oil cylinder and a stretching oil cylinder; three unload oil openings of a moment restriction valve are respectively communicated with a first amplitude variation oil cylinder rod cavity, a second amplitude variation oil cylinder rodless cavity and a stretching oil cylinder rodless cavity via the unidirectional balance valve, the first bidirectional balance valve and the second bidirectional balance valve. The hydraulic control moment restriction system of the folding arm lorry-mounted crane has the beneficial effects that the moment restriction valve adopts hydraulic control without a controller and a sensor, and the system is simple, and the cost is low; an anti-explosion valve can be locked after cartridge ignition so as to prevent an oil cylinder from stalling and falling off and guarantee the safety performance; the force limited state is forcefully relieved so as to achieve emergency operation.
Hydraulic control moment restriction system of folding arm lorry-mounted crane
2015-04-29
Patent
Elektronische Ressource
Englisch
IPC: | B66C Krane , CRANES |
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