Hydraulic circuit controlling preferred movement of moveable arm to lift or rotate

Abstract

A hydraulic circuit controlling preferred movement of a moveable arm to lift or rotate is disclosed, and comprises a rotary motor (12), and a moveable arm lifting oil cylinder (8); a first hydraulic pump (P1), a second hydraulic pump (P2) and a guide oil pump (P3); a moveable arm control valve (7) located in the downstream of the second hydraulic pump (P2) to control hydraulic liquid which is supplied to the moveable arm lifting oil cylinder (8); a rotary control valve (4) located in the downstream of the first hydraulic pump (P1) to control the hydraulic liquid which is supplied to the rotary motor (12) and/or a confluence valve (11); a preferred valve (13) in the downstream of the first hydraulic pump (P1) for dividing the hydraulic liquid of the first hydraulic pump (P1); an electromagnetic valve (15) in the downstream of the guide oil pump (P3) for switching between the states that a guide control oil path (14) of the preferred valve (13) is communicated with the oil tank or communicated with the guide oil pump (P3); and the confluence valve (11) in the downstream of the rotary control valve (4) for controlling the oil path (1) to be communicated with the oil path (3) or an oil return pipeline.

Description

technical field [0001] The invention relates to a hydraulic circuit of a hydraulic excavator, in particular to a hydraulic circuit for controlling the lifting or rotating priority action of the arm of the excavator. Background technique [0002] The excavator is mainly composed of engine, hydraulic circuit device, working device, walking device, boarding platform and electrical control. The boom, arm and bucket of the working device are respectively supplied with oil by one pump or multiple pumps individually or jointly. The rotation of the loading platform is driven by one pump. Any two or more hydraulic actuators in the excavator simultaneously The work constitutes a compound action. In the compound action, the compound action of raising and turning the boom is a very high-frequency operating condition, and its coordination affects the working efficiency of the excavator. In the process of operation, it often happens that the boom reaches the ideal working position but th...

AI Technical Summary

Problems solved by technology

Although the technical solution of this patent application solves the technical problems of the slow swing speed of the boom and the incoordination between the swing of the boom and the rotation of the body during the body rotation of the excavator, it cannot be selected under complex working conditions. Slewing priority mode, so that the two working conditions can be better coordinated, and the energy consumption of the excavator can be reduced

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