The invention discloses a confluence control device of a hydraulic crane. The pilot-operated hydraulic control mode and the proportional electromagnetic valve pilot control mode are adopted for controlling confluence and flow on the two sides. Connection of a confluence device is decided by the one, with higher pressure, of a hydraulic control pilot oil channel and an electric proportion control pilot oil channel, and the combined work flow of the left side and the right side is decided by the continuous change condition of the deflection angle of a pilot handle or the pressure condition on the two sides of a system. Left-to-right confluence or right-to-left confluence is selected according to the pressure flow requirement of systems on the two sides of combined confluence. Confluence impact generated when the crane acts is reduced by controlling moving of a confluence valve core. According to the invention, impact generated in the confluence process of a main hydraulic valve of the crane is reduced, the confluence process can be controlled, the micro-motion property in the process of winching small flow by the crane is guaranteed, and the confluence process can be smooth; by adopting the electronic control confluence mode, the feasibility performance of confluence is improved, and the requirements of hydraulic actuating mechanisms of engineering machinery for hydraulic system confluence on different work conditions can be met.
Confluence control device of hydraulic crane
02.12.2015
Patent
Elektronische Ressource
Englisch
Engineering machinery intelligent confluence control hydraulic system
Europäisches Patentamt | 2015
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