A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
HYDRAULIC SHOVEL DRIVE SYSTEM
PROBLEM TO BE SOLVED: To provide a hydraulic shovel drive system capable of preventing generation of cavitation on a cylinder for oscillating an arm or a bucket due to influence of gravity force with an inexpensive constitution.SOLUTION: A hydraulic shovel drive system includes a cylinder for oscillating an oscillation portion, a control valve for controlling supply and discharge of a hydraulic oil to the cylinder, an operation device outputting an operation signal according to an inclination angle of an operation lever in receiving a first operation to make the oscillation portion approach a cabin, and a second operation to make the oscillation portion separate from the cabin, an electromagnetic proportional valve connected to a first pilot port for the first operation of the control valve, and a control device for controlling the electromagnetic proportional valve on the basis of the operation signal. The control device controls the electromagnetic proportional valve so that a pilot pressure output from the electromagnetic proportional valve is in proportion to the operation signal output from the operation device by an upper limit pressure, and the upper limit pressure is raised in accordance with approach of the oscillation portion to the cabin, when the operation device receives the first operation.SELECTED DRAWING: Figure 1
【課題】アームまたはバケットを揺動させるシリンダに重力の影響でキャビテーションが発生することを安価な構成で防止できる油圧ショベル駆動システムを提供する。【解決手段】油圧ショベル駆動システムは、揺動部を揺動させるシリンダと、シリンダに対する作動油の供給および排出を制御する制御弁と、揺動部をキャビンに近づける第１操作および揺動部をキャビンから遠ざける第２操作を受けたときに操作レバーの傾倒角に応じた操作信号を出力する操作装置と、制御弁の第１操作用の第１パイロットポートと接続された電磁比例弁と、操作信号に基づいて電磁比例弁を制御する制御装置と、を備え、制御装置は、操作装置が第１操作を受けたとき、電磁比例弁から出力されるパイロット圧が、上限圧までは操作装置から出力される操作信号に比例し、かつ、揺動部がキャビンに近いほど上限圧が上昇するように、電磁比例弁を制御する。【選択図】図１
HYDRAULIC SHOVEL DRIVE SYSTEM
PROBLEM TO BE SOLVED: To provide a hydraulic shovel drive system capable of preventing generation of cavitation on a cylinder for oscillating an arm or a bucket due to influence of gravity force with an inexpensive constitution.SOLUTION: A hydraulic shovel drive system includes a cylinder for oscillating an oscillation portion, a control valve for controlling supply and discharge of a hydraulic oil to the cylinder, an operation device outputting an operation signal according to an inclination angle of an operation lever in receiving a first operation to make the oscillation portion approach a cabin, and a second operation to make the oscillation portion separate from the cabin, an electromagnetic proportional valve connected to a first pilot port for the first operation of the control valve, and a control device for controlling the electromagnetic proportional valve on the basis of the operation signal. The control device controls the electromagnetic proportional valve so that a pilot pressure output from the electromagnetic proportional valve is in proportion to the operation signal output from the operation device by an upper limit pressure, and the upper limit pressure is raised in accordance with approach of the oscillation portion to the cabin, when the operation device receives the first operation.SELECTED DRAWING: Figure 1
【課題】アームまたはバケットを揺動させるシリンダに重力の影響でキャビテーションが発生することを安価な構成で防止できる油圧ショベル駆動システムを提供する。【解決手段】油圧ショベル駆動システムは、揺動部を揺動させるシリンダと、シリンダに対する作動油の供給および排出を制御する制御弁と、揺動部をキャビンに近づける第１操作および揺動部をキャビンから遠ざける第２操作を受けたときに操作レバーの傾倒角に応じた操作信号を出力する操作装置と、制御弁の第１操作用の第１パイロットポートと接続された電磁比例弁と、操作信号に基づいて電磁比例弁を制御する制御装置と、を備え、制御装置は、操作装置が第１操作を受けたとき、電磁比例弁から出力されるパイロット圧が、上限圧までは操作装置から出力される操作信号に比例し、かつ、揺動部がキャビンに近いほど上限圧が上昇するように、電磁比例弁を制御する。【選択図】図１
HYDRAULIC SHOVEL DRIVE SYSTEM
油圧ショベル駆動システム
KONDO TETSUHIRO (author) / KATO TAKEHISA (author)
2018-03-29
Patent
Electronic Resource
Japanese