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A platform for research: civil engineering, architecture and urbanism
HYDRAULIC SYSTEM, HYDRAULIC SHOVEL AND CONTROL METHOD FOR HYDRAULIC SHOVEL
To warm up a hydraulic device mounted on a hydraulic shovel.SOLUTION: A hydraulic system comprises: a main hydraulic circuit composed of an open circuit for driving a work machine cylinder 24; a swing hydraulic circuit composed of a closed circuit for driving a swing motor 30; a back pressure valve 18 that is arranged in a tank flow path 27 between a main valve 26 and a tank 28, and adjusts the back pressure of the main valve 26; a warm-up flow path 76 arranged around a spool of a neutral holding valve 33; a supply channel 78 connecting an upstream portion of a tank flow path 17 between the main valve 26 and the back pressure valve 18 and an inlet port of the warm-up flow path 76; and a discharge flow path 79 connecting a downstream portion of the tank flow path between the back pressure valve 18 and the tank 28 and an outlet port of the warm-up flow path 76. When the temperature is low, the back pressure valve 18 is set to a second set pressure, and warm oil warmed by relief operation of the main valve 26 is supplied to a warm circuit of the neutral holding valve 33, thereby promoting warming up of the neutral holding valve 33.SELECTED DRAWING: Figure 6
【課題】油圧ショベルに搭載されている油圧機器を暖気すること。【解決手段】油圧システムは、作業機シリンダ２４を駆動するオープン回路により構成されたメイン油圧回路と、旋回モータ３０を駆動するクローズド回路により構成された旋回油圧回路と、メイン弁２６とタンク２８との間のタンク流路２７に配置され、メイン弁２６の背圧を調整する背圧弁１８と、中立保持弁３３のスプールの周囲に配置される暖機流路７６と、メイン弁２６と背圧弁１８との間のタンク流路１７の上流部分と暖機流路７６の入口ポートとを接続する供給流路７８と、背圧弁１８とタンク２８との間のタンク流路の下流部分と暖機流路７６の出口ポートとを接続する排出流路７９と、を備える。低温時は、背圧弁１８を第２セット圧とし、メイン弁２６のリリーフ操作で暖気された暖かい油を中立保持弁３３の暖気回路に供給することで、中立保持弁３３の暖気を促進する。【選択図】図６
HYDRAULIC SYSTEM, HYDRAULIC SHOVEL AND CONTROL METHOD FOR HYDRAULIC SHOVEL
To warm up a hydraulic device mounted on a hydraulic shovel.SOLUTION: A hydraulic system comprises: a main hydraulic circuit composed of an open circuit for driving a work machine cylinder 24; a swing hydraulic circuit composed of a closed circuit for driving a swing motor 30; a back pressure valve 18 that is arranged in a tank flow path 27 between a main valve 26 and a tank 28, and adjusts the back pressure of the main valve 26; a warm-up flow path 76 arranged around a spool of a neutral holding valve 33; a supply channel 78 connecting an upstream portion of a tank flow path 17 between the main valve 26 and the back pressure valve 18 and an inlet port of the warm-up flow path 76; and a discharge flow path 79 connecting a downstream portion of the tank flow path between the back pressure valve 18 and the tank 28 and an outlet port of the warm-up flow path 76. When the temperature is low, the back pressure valve 18 is set to a second set pressure, and warm oil warmed by relief operation of the main valve 26 is supplied to a warm circuit of the neutral holding valve 33, thereby promoting warming up of the neutral holding valve 33.SELECTED DRAWING: Figure 6
【課題】油圧ショベルに搭載されている油圧機器を暖気すること。【解決手段】油圧システムは、作業機シリンダ２４を駆動するオープン回路により構成されたメイン油圧回路と、旋回モータ３０を駆動するクローズド回路により構成された旋回油圧回路と、メイン弁２６とタンク２８との間のタンク流路２７に配置され、メイン弁２６の背圧を調整する背圧弁１８と、中立保持弁３３のスプールの周囲に配置される暖機流路７６と、メイン弁２６と背圧弁１８との間のタンク流路１７の上流部分と暖機流路７６の入口ポートとを接続する供給流路７８と、背圧弁１８とタンク２８との間のタンク流路の下流部分と暖機流路７６の出口ポートとを接続する排出流路７９と、を備える。低温時は、背圧弁１８を第２セット圧とし、メイン弁２６のリリーフ操作で暖気された暖かい油を中立保持弁３３の暖気回路に供給することで、中立保持弁３３の暖気を促進する。【選択図】図６
HYDRAULIC SYSTEM, HYDRAULIC SHOVEL AND CONTROL METHOD FOR HYDRAULIC SHOVEL
油圧システム、油圧ショベル、及び油圧ショベルの制御方法
SUMINO WATARU (author) / KOZUKA DAISUKE (author) / HASEBE AKIRA (author) / IKEDA MASATOSHI (author)
2023-04-11
Patent
Electronic Resource
Japanese
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