The invention relates to a crane boom luffing hydraulic control system. The crane boom luffing hydraulic control system comprises a pressure oil source, a control handle, a luffing oil cylinder, a reversing valve and an oil tank, wherein the reversing valve comprises a transition position, the rod cavity of the luffing oil cylinder is not communicated with the pressure oil source at the transition position; the rodless cavity of the luffing oil cylinder is communicated with the oil tank through a second working oil port and an oil return port of the reversing valve to realize oil return, and the rod cavity of the luffing oil cylinder is communicated with the oil tank through a first working oil port and the oil return port of the reversing valve to realize backpressure oil supplement. The invention also relates to a luffing device and a crane. The crane boom luffing hydraulic control system, the luffing device and the crane disclosed by the invention are capable of improving the jogging property of boom luffing control and the hydraulic efficiency of luffing-down.
Crane boom luffing hydraulic control system, luffing device and crane
13.05.2015
Patent
Elektronische Ressource
Englisch
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