A confluence control device for a hydraulic crane

Abstract

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.

Description

technical field [0001] The invention relates to a hydraulic crane control device, in particular to a hydraulic crane confluence control device, which belongs to the technical field of hydraulic crane control devices. Background technique [0002] The confluence control device is an important part and key control unit of the hydraulic crane. The main factors to be considered in the design are: the size of the flow capacity, the loss of pressure, the impact when the confluence is opened or closed, and the fretting when the small flow is single-action It has the characteristics of large flow capacity, small pressure loss, small impact when the confluence is opened or closed, no confluence when the small flow is in single action to ensure micro-movement, and no delay in action. Confluence controls are the best. [0003] At present, in truck cranes, the main actions include main hoisting, auxiliary hoisting, telescopic, luffing, and slewing. Among them, the first four actions ar...

AI Technical Summary

Problems solved by technology

As for the design of the confluence control device of the hydraulic crane, the hydraulic control type automatic confluence method is generally adopted at home and abroad, and due to irregular design and other reasons, the confluence impact will be caused when the crane moves.

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