BOOM LOWERING CONTROL SYSTEM IN WORK MACHINE

To perform a control for lowering a boom at a descending speed according to an operation tool operation amount in a stable condition even if a work attachment is replaced in a work machine in which a replaceable work attachment is attached to a tip of a work arm including a boom.SOLUTION: There is p...

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Bibliographic Details
Main Authors KIYASU KOICHI, NAKAJIMA HIDEKI, MINAGI RYOTA
Format Patent
LanguageEnglish
Japanese
Published 26.10.2023
Subjects
DREDGING
FIXED CONSTRUCTIONS
FOUNDATIONS
HYDRAULIC ENGINEERING
SOIL SHIFTING
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Summary:To perform a control for lowering a boom at a descending speed according to an operation tool operation amount in a stable condition even if a work attachment is replaced in a work machine in which a replaceable work attachment is attached to a tip of a work arm including a boom.SOLUTION: There is provided a monitor device 22 which inputs information regarding a weight of an attached work attachment 8 into a controller 21. The controller 21 is provided with a map 35 which shows a relationship between a weight of a replaceable work attachment 8 and a holding pressure of a boom cylinder head side oil chamber 14a. The controller 21 calculates a holding pressure estimation value according to the weight of the attached work attachment 8 based on the map 35, and controls an opening area of a contraction side discharge opening 18f of a control valve 18 based on the holding pressure estimation value.SELECTED DRAWING: Figure 3 【課題】ブームを含む作業アームの先端部に交換可能な作業アタッチメントが装着された作業機械において、作業アタッチメントを交換しても操作具操作量に応じた下降速度でブームを下降させるための制御を安定した状態で行えるようにする。【解決手段】装着された作業アタッチメント８の重量に関する情報をコントローラ２１に入力するモニタ装置２２を設けるとともに、コントローラ２１に、交換可能な作業アタッチメント８の重量とブームシリンダヘッド側油室１４ａの保持圧との関係を示したマップ３５を設け、該マップ３５に基づいて装着された作業アタッチメント８の重量に対応する保持圧推定値を求めるとともに、該保持圧推定値に基づいてコントロールバルブ１８の縮小側排出用開口１８ｆの開口面積を制御する構成にした。【選択図】図３
Bibliography:Application Number: JP20220066859