HYDRAULIC SYSTEM OF CONSTRUCTION MACHINE

To provide a hydraulic system of a construction machine capable of disabling operations on an operation device without using a dedicated solenoid valve for disabling the operations on the operation device.SOLUTION: A hydraulic system 1A comprises a plurality of control valves 4 interposed between a...

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Bibliographic Details
Main Authors KONDO TETSUHIRO, NAKAGAWA HITOSHI, HATA NAOKI
Format Patent
LanguageEnglish
Japanese
Published 01.03.2021
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
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Summary:To provide a hydraulic system of a construction machine capable of disabling operations on an operation device without using a dedicated solenoid valve for disabling the operations on the operation device.SOLUTION: A hydraulic system 1A comprises a plurality of control valves 4 interposed between a main pump 22 and a plurality of hydraulic actuators, and a plurality of electromagnetic proportional valves 6 respectively connected to pilot ports of the control valves 4. A first electromagnetic proportional valve 6a and a second electromagnetic proportional valve 6b of the electromagnetic proportional valves 6 are respectively connected to a pair of pilot ports of a specific control valve. The first electromagnetic proportional valve 6a and the second electromagnetic proportional valve 6b are directly connected to an auxiliary pump 23, and the other electromagnetic proportional valves 6 are connected to the auxiliary pump 23 via a selector valve 52. The selector valve 52 has a pilot port connected by a first pilot line 5a and a switching pilot line 54 between the first electromagnetic proportional valve 6a and the specific control valve.SELECTED DRAWING: Figure 1 【課題】操作装置に対する操作を無効とするための専用の電磁弁を用いることなく、操作装置に対する操作を無効とすることができる建設機械の油圧システムを提供する。【解決手段】１つの側面からの油圧システム１Ａは、主ポンプ２２と複数の油圧アクチュエータとの間に介在する複数の制御弁４と、制御弁４のパイロットポートとそれぞれ接続された複数の電磁比例弁６を含む。電磁比例弁６のうちの第１電磁比例弁６ａおよび第２電磁比例弁６ｂは特定制御弁の一対のパイロットポートとそれぞれ接続されている。第１電磁比例弁６ａおよび第２電磁比例弁６ｂは副ポンプ２３と直接的に接続されており、それ以外の電磁比例弁６は切換弁５２を介して副ポンプ２３と接続されている。切換弁５２は、第１電磁比例弁６ａと特定制御弁の間の第１パイロットライン５ａと切換パイロットライン５４により接続されたパイロットポートを有する。【選択図】図１
Bibliography:Application Number: JP20190152662