CONSTRUCTION MACHINE

• Main Authors: SHIMIZU JURI, HIRAKU KENJI, OKANO HAJIME
• Format: Patent
• Language: English; Japanese
• Published: 27.07.2023
• 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 improve responsiveness of another actuator in the state where single-rod type hydraulic cylinders are driven by closed circuit pumps and opened circuit pumps.SOLUTION: A controller 57 performs control of stopping discharge of hydraulic oil of closed circuit pumps 12, 14, 16 and 18, and opened circuit pumps 13, 15, 17 and 19, and controls closed circuit switching valves 43a to 43d, 45a to 45d, 47a to 47d, and 49a to 49d so that connection destinations of the closed circuit pumps 12, 14, 16 and 18 are switched to the other actuator from first single-rod type hydraulic cylinders 1, 3 and 5, at such a timing after signals corresponding to the state where the discharge of the hydraulic oil of the closed circuit pumps 12, 14, 16 and 18 is stopped have been acquired from sensors 12b, 13b, ... and 19b, and before signals corresponding to the state where the discharge of the hydraulic oil of the opened circuit pumps 13, 15, 17 and 19 is stopped are acquired from the sensors 12b, 13b, ... and 19b.SELECTED DRAWING: Figure 2 【課題】閉回路ポンプと開回路ポンプで片ロッド式油圧シリンダを駆動している状態での他のアクチュエータの応答性を向上させることが可能な建設機械を提供する。【解決手段】コントローラ５７は、閉回路ポンプ１２，１４，１６，１８及び開回路ポンプ１３，１５，１７，１９の作動油の吐出を停止する制御を行い、閉回路ポンプ１２，１４，１６，１８の作動油の吐出が停止された状態に対応する信号をセンサ１２ｂ，１３ｂ，・・・，１９ｂから取得した後でありかつ開回路ポンプ１３，１５，１７，１９の作動油の吐出が停止された状態に対応する信号をセンサ１２ｂ，１３ｂ，・・・，１９ｂから取得する前のタイミングで、閉回路ポンプ１２，１４，１６，１８の接続先が第１片ロッド式油圧シリンダ１，３，５から前記他のアクチュエータに切り換わるように、閉回路切換弁４３ａ～４３ｄ，４５ａ～４５ｄ，４７ａ～４７ｄ，４９ａ～４９ｄを制御する。【選択図】 図２