The invention discloses a forklift full-free portal frame hydraulic system with an impact absorption function in the field of forklift hydraulic control, which comprises a forklift controller, a rear lifting oil cylinder, a front lifting oil cylinder and a speed limiting valve, and stop valves are respectively mounted at oil inlet holes of the rear lifting oil cylinder and the front lifting oil cylinder. Valve ports of the stop valves are jointly connected with an oil return hole of the speed limiting valve, a four-position five-way pressure switching valve is connected in a bypass mode in a connecting pipeline of the speed limiting valve and the stop valves, and the four-position five-way pressure switching valve is connected with a plurality of bag type energy accumulators with different inflation pressures. The bag type energy accumulators with different inflation pressures are adopted, so that the impact absorption range of the bag type energy accumulators covers 0.75-1 time of the rated load of the forklift and the no-load state of the forklift, and the problem that in the lifting or descending process of the full-free portal frame, the load of the forklift cannot be influenced is solved within the wide load range. When the front lifting oil cylinder and the rear lifting oil cylinder are switched, hydraulic impact is caused by the pressure difference between the front lifting oil cylinder and the rear lifting oil cylinder, and the driving comfort of the forklift is improved.
本发明公开了叉车液压控制领域的一种带冲击吸收的叉车全自由门架液压系统,包括叉车控制器、后置起升油缸、前置起升油缸、限速阀,后置起升油缸、前置起升油缸的进油孔处分别安装有切断阀,各切断阀的阀口共同与限速阀的回油孔连接,限速阀与切断阀的连接管路中旁通连接四位五通压力切换阀,四位五通压力切换阀与充气压力不同的多个囊式蓄能器连接。本发明采用具有不同充气压力的囊式蓄能器,使囊式蓄能器吸收的冲击范围覆盖叉车额定负载的0.75~1倍之间和空载状态,可在较宽的负载范围内解决全自由门架起升或者下降过程中,前置起升油缸和后置起升油缸进行切换时因为两种油缸之间的压力差而导致液压冲击,提高叉车的驾驶舒适性。
Forklift full-free gantry hydraulic system with impact absorption function
一种带冲击吸收的叉车全自由门架液压系统
07.06.2022
Patent
Elektronische Ressource
Chinesisch
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 / F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein |
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