The invention discloses a hydraulic system for telescopic buffer of a crane boom and a crane. The hydraulic system for telescopic buffer of the crane boom comprises a telescopic oil cylinder, a main valve and a balance valve, wherein a first working oil port and a second working oil port of the main valve are respectively connected to a rod chamber of the telescopic oil cylinder and a free oil inlet of the balance valve in a communication way, a free oil outlet of the balance valve is connected to a rodless chamber of the telescopic oil cylinder in a communication way, and the first working oil port is also connected to a control oil port of the balance valve in a communication way through a control oil line; and the hydraulic system for telescopic buffer of the crane boom also comprises an auxiliary pressure-relief oil line, a through flow damper and a hydraulic control pressure-relief on-off valve, wherein the oil inlet end of the auxiliary pressure-relief oil line is connected to the rodless chamber of the telescopic oil cylinder in a communication way, the through flow damper and the hydraulic control pressure-relief on-off valve are arranged on the auxiliary pressure-relief oil line, and the control oil port of the hydraulic control pressure-relief on-off valve is connected to the control oil line or the first working oil port in a communication way. By implementing the hydraulic system, impact generated by the balance valve or a pressure shunting damper when the crane boom is started to be shrunk can be effectively reduced.
Hydraulic system for telescopic buffer of crane boom and crane
2015-06-10
Patent
Electronic Resource
English
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