A bucket leveling system for an aerial work truck, a main valve (28) being able to be a cartridge valve or a multi-way valve; the maximum load pressures on a telescopic cylinder (34) and a luffing cylinder (33) are both fed back to a load-sensing port LS of a constant-pressure differential variable pump (23); a reversing valve is provided on a liquid passage which connects a pressure port P of the main valve (28) and a pressure port P of a leveling valve (29), and when the reversing valve is in a spring position, the pressure of the pressure port P of the leveling valve (29) is zero, and when the reversing valve is reversed, the pressure port P of the constant-pressure differential variable pump (23) is in communication, by means of a speed regulating valve (281), with the port P of the leveling valve (29), and the pressure of the port P of the leveling valve (29) is fed back, by means of a one-way valve connected at the port of the reversing valve, to the load-sensing port LS of the constant-pressure differential variable pump (23). The bucket leveling system is easy to control, there is no lag in leveling action, and the system responds quickly; the entire system is a load-sensing system, saving energy consumption.
Bucket leveling system for aerial work truck
2021-03-24
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 / F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein |
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