Two-pump confluence hydraulic control system

Abstract

The invention relates to a hydraulic control system and discloses a two-pump confluence hydraulic control system to overcome the defect of large two-pump confluence hydraulic system impact. The system comprises a working hydraulic system, a second hydraulic pump and an electro-hydraulic control unloading valve group. A valve group confluence oil outlet is communicated with a valve group confluence oil inlet through a pipe working system, and a check valve is arranged between the valve group confluence oil inlet and the valve group confluence oil outlet. The oil inlet end of an external control spill valve is communicated with the oil inlet end of the check valve, and an oil outlet of the external control spill valve is communicated with a valve group unloading oil outlet. A solenoid directional valve and a hydraulic operated directional valve are connected in series and are then connected with an external control end of the external control spill valve and the valve group unloading oil outlet. The hydraulic control end of the hydraulic operated directional valve is connected with a pilot valve through a shuttle valve. The control unit comprises a controller and a displacement detection unit, and the electric control end of the solenoid directional valve is connected with a controller. By means of the system, the hydraulic impact of a hydraulic actuator at the stroke terminal can be reduced.

Description

technical field [0001] The invention relates to a construction machinery hydraulic control system, in particular to a dual-pump confluence hydraulic control system for oil supply from two pressure oil sources. Background technique [0002] Many construction machinery have multiple pressure oil sources for oil supply. For example, there are at least two pressure oil sources for loaders, one of which is used for steering hydraulic system, and the other is used for working hydraulic system to supply oil to working devices such as boom cylinder, steering Bucket cylinder and other oil supply. As the main force of construction machinery, loaders are widely used in many engineering projects due to their cheap price, convenient operation, and fast movement and transition. However, they have excessive fuel consumption, excessive discharge, and oil Disadvantages such as easy leakage. With the requirement of energy saving and consumption reduction, the energy saving and consumption r...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a multi-pump converging hydraulic system that can automatically close the dual-pump converging function and reduce the hydraulic shock in view of the shortcomings of the existing double-pump converging hydraulic system.

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