Priority valve of hydraulic excavator, using method and excavator

Abstract

The invention discloses a priority valve of a hydraulic excavator, a using method and an excavator, and belongs to the field of hydraulic valves. The priority valve particularly comprises a valve body, wherein an output opening 1, a pressure relief opening 2, a first input opening 3 and a second input opening 4 are formed in the valve body; the first input opening 3 is connected with a first pressure detecting component; connection and disconnection of the second input opening 4 and the output opening 1 are controlled by a spool connected with the first pressure detecting component; and the priority valve also comprises a second pressure detecting component. According to the technical scheme, the priority valve has the advantages that priority time between composite actions can be quantitatively regulated, and the priority valve functions as long as the priority pressure of a priority action is greater than a first pressure preset value; priority pressure which pushes the spool of a second action control valve to move is quantitatively changed along the priority pressure of the priority action; and the priority pressure of a second action cannot be reduced without limitation, and the minimum value of the priority pressure can be set through a spring.

Description

technical field [0001] The invention relates to a hydraulic valve, in particular to a hydraulic excavator priority valve, its use method and the excavator. Background technique [0002] An excavator, also known as an excavator, is an earth-moving machine that uses a bucket to excavate materials that are higher or lower than the bearing surface, and load them into transport vehicles or unload them to the stockyard. With the large-scale development of infrastructure, excavators have been widely used in construction, water conservancy and other engineering fields. When the excavator works, it completes different operations such as excavation and leveling through the mutual cooperation of the boom, stick, bucket and slewing body. In addition to the continuous improvement of the performance requirements of the excavator, the user also has an increasing requirement for the operation performance of the whole machine. Excavators often need to perform compound actions during operat...

AI Technical Summary

Problems solved by technology

However, by improving the throttling groove of the main spool and improving the priority circuit of valves, to achieve the effect of relative priority between actions requires major changes to the main valve and oil circuit of the excavator, and the control is complicated and difficult to achieve

However, the priority start point, priority time and pilot pressure of the existing priority valve cannot be controlled, which greatly reduces its practicability

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