CONSTRUCTION MACHINE

• Main Authors: OTA AKIRA, KAWASAKI KENJI, KAMOTO DAIGORO, SAKURAI SHIGEYUKI
• Format: Patent
• Language: English; Japanese
• Published: 18.04.2024
• Subjects: BLASTING; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR; DREDGING; FIXED CONSTRUCTIONS; FLUID-PRESSURE ACTUATORS; FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS; FOUNDATIONS; HEATING; HYDRAULIC ENGINEERING; HYDRAULICS OR PNEUMATICS IN GENERAL; LIGHTING; MECHANICAL ENGINEERING; SOIL SHIFTING; SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; WEAPONS

To provide a construction machine which can prolong a hydraulic fluid exchange interval.SOLUTION: A hydraulic shovel includes: an additive agent tank 23 for storing an additive agent; an additive agent supply line 24 for supplying the additive agent to a hydraulic oil tank 14 from the additive agent tank 23; an opening/closing valve 25 arranged in the additive agent supply line 24 and switched between a closed state and an opened state; an oxidation degree sensor 27 for detecting an oxidation degree of hydraulic oil; and a controller 28. When a change rate of the oxidation degree of the hydraulic oil is equal to or more than a predetermined value, the controller 28 executes control of reporting that the opening/closing valve 25 is switched to the opened state, or control of switching the opening/closing valve 25 to the opened state. When a machine operation time from exchange of the hydraulic oil or a machine operation time after the opening/closing valve 25 is switched from the opened state to the closed state is equal to or more than a predetermined value, the controller 28 executes control of reporting that the opening/closing valve 25 is switched to the opened state or control of switching the opening/closing valve 25 to the opened state.SELECTED DRAWING: Figure 2 【課題】作動油の交換インターバルの長期化を図ることができる建設機械を提供する。【解決手段】油圧ショベルは、添加剤を貯える添加剤タンク２３と、添加剤タンク２３から作動油タンク１４へ添加剤を供給する添加剤供給ライン２４と、添加剤供給ライン２４に配置され、閉状態と開状態とで切換えられる開閉弁２５と、作動油の酸化度を検出する酸化度センサ２７と、コントローラ２８とを備える。コントローラ２８は、作動油の酸化度の変化率が所定値以上であるとき、開閉弁２５を開状態に切換える旨を報知する制御、または開閉弁２５を開状態に切換える制御を実行する。コントローラ２８は、作動油を交換した時からの機械運転時間、もしくは開閉弁２５を開状態から閉状態に切換えてからの機械運転時間が所定値以上であるとき、開閉弁２５を開状態に切換える旨を報知する制御、または開閉弁２５を開状態に切換える制御を実行する。【選択図】図２