Provided are a control valve, a derricking cylinder and a working method thereof, and an aerial work platform, relating to the field of aerial work. The control valve of the derricking cylinder includes a first balance valve provided on the oil circuit between the first port G and the second port F, and a second balance valve provided on the oil circuit between the third port H and the fourth port E; and a switch valve in series with the first balance valve is further provided on the oil circuit between the first port G and the second port F. When the first balance valve fails, it can still prevent the oil from returning from the oil circuit between the first port G and the second port F by cutting off the switch valve, and the control valve has high operational reliability. The control valve seals the high-pressure oil in the rodless cavity of the derricking cylinder through the double insurance of the first balance valve and the second balance valve, and the lifting arm remains at rest, and does not move downwards, causing the work bucket to tilt or causing the entire work platform to tip over. The safety of the aerial work platform is high.
CONTROL VALVE, DERRICKING CYLINDER AND WORKING METHOD THEREOF, AERIAL WORK PLATFORM
2021-03-25
Patent
Elektronische Ressource
Englisch
IPC: | B66F HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last / B66C Krane , CRANES / F16K VALVES , Ventile |
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