| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluid control circuit which can improve the interlocking operability between a tool actuator and the other actuator by employing a simple circuit structure. SOLUTION: The fluid control circuit has installed therein a control means 33 for outputting control signals for controlling a tool bypass control valve 16, a boom control valve 17, and a tool control valve 22 according to a tool lever operating amount and a boom lever operating amount. The control means 33 has stored therein a single-acting table 34 and a cooperatively acting table 35. The single-acting table 34 is applicable to the case where a tool is singly operated, and has characteristics in which a control signal to the tool bypass control valve 16 in terms of the tool lever operating amount is controlled such that the tool bypass control valve 16 exerts a maximum stroke when maximally operated. The cooperatively acting table 35 is applicable to the case where a boom and a tool are operated in association with each other, and has characteristics in which a control signal to the tool bypass control valve 16 in terms of the tool operating amount is controlled such that the maximum stroke of the tool bypass control valve 16 is reduced compared with the tool single acting operation when maximally operated. COPYRIGHT: (C)2009,JPO&INPIT
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