Combined control system of quantitative pump and variable pump of loader

Abstract

The invention relates to a composite control system of a loader with a quantitative pump and a variable pump. The problem of large overflow energy loss and low system efficiency of the existing loader control system is solved. It includes a flow amplifying valve, a pilot control valve, and a working device main valve. The flow amplifying valve includes a priority valve and a reversing valve, and also includes a quantitative pump, a variable pump, an unloading control valve and a confluence control valve. The quantitative The pump communicates with the main valve of the working device through the unloading control valve. The confluence control valve includes a confluence valve, a selection shuttle valve and a signal shuttle valve. The variable variable pump communicates with the confluence valve through a priority valve. The confluence valve has a At this time, the priority valve is disconnected from the first position of the main valve of the working device, and the second position is driven by the pressure oil of the selection shuttle valve so that the priority valve is connected to the main valve of the working device. The invention is provided with a confluence control valve and an unloading control valve, adopts a quantitative pump and a variable pump to output pressure oil at the same time to avoid overflow loss of the system, and improves the efficiency of the system.

Description

technical field [0001] The invention relates to a control system of a loader, in particular to a compound control system of a quantitative pump and a variable pump of the loader. Background technique [0002] Loader is a kind of earthwork construction machinery widely used in road, railway, construction, hydropower, port, mine and other construction projects. It is mainly used for shoveling bulk materials such as soil, sand, lime, coal, etc. , hard soil, etc. for light shoveling and digging operations. It can also carry out bulldozing, lifting and loading and unloading of other materials such as wood by changing different auxiliary working devices. In the construction of roads, especially high-grade highways, loaders are used for filling and excavation of roadbed engineering, asphalt mixture and aggregate and loading of cement concrete yards. Still can undertake pushing ground of carry soil, strickle and drawing in addition the exercise such as other machine. Because fork...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of large overflow energy loss and low system efficiency in the existing loader control system in the background technology, the present invention provides a compound control system of a loader fixed pump and variable pump

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