Construction Machinery Stick Control System

Abstract

[Problem] In a construction machine equipped with an arm, in order to improve the recovery efficiency from the rod end oil chamber to the head end oil chamber during the extension operation of the arm cylinder, and at the same time prevent the operation speed of the arm cylinder when recovery is impossible damage, and a reduction in the number of parts. [Solution] It is configured such that a first region Y1 and a second region Y2 at which the discharge valve passage 14g is provided in the operating position of the stick control valve 14 during the extending operation of the stick cylinder Open while being throttled, at this second region Y2, the discharge valve passage 14g is more open than at the first region Y1, and if during the extending operation of the stick cylinder 9 from the rod end oil chamber 9b to the head end If recovery of the oil chamber 9a is possible, the stick control valve 14 is positioned at the first area Y1, and if recovery is not possible, at the area Y2.

Description

technical field [0001] The present invention relates to the technical field of an arm control system in a construction machine equipped with an arm that swings based on extension and retraction operations of an arm cylinder. Background technique [0002] Generally, in construction machines, there are some examples like hydraulic excavators, which are configured such that the front work implement mounted on the machine body is configured to use a boom having a vertically movable A base end portion supported by the machine body in a manner of movement, a stick that is swingably supported longitudinally to a front end portion of the boom, and work attachments, such as those attached to the front end of the stick A bucket, wherein the swing of the stick is performed based on the extension and retraction operation of the stick cylinder. In this construction machine, the swing of the arm that moves the tip end portion of the arm in the direction approaching the machine body by ex...

AI Technical Summary

Problems solved by technology

[0003] The arm cylinder The pressure of the head end oil chamber of the head end oil chamber is higher than the pressure of the rod end oil chamber, so the recovery from the rod end oil chamber to the head end oil chamber is no longer performed

If recovery is no longer performed in this way, when the discharge flow from the rod end oil chamber is throttled, there is a problem that the rod end oil chamber becomes high pressure and the operating speed of the arm cylinder becomes slow

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