Construction machine
    1.
    发明公开
    Construction machine 失效
    建筑机械

    公开(公告)号:EP1384902A3

    公开(公告)日:2004-02-25

    申请号:EP03077961.5

    申请日:1997-06-26

    IPC分类号: F15B11/04 E02F9/12

    摘要: A construction machine comprising a lower carriage (12); a working attachment (17) attached rotatably to an upper rotating structure (14); and posture detecting means for detecting a posture of the working attachment, characterized in that the construction machine has a control circuit comprising: a rotating direction control valve (29) for controlling rotation of the upper rotating structure; an unloading valve being a cut-off valve (33) adapted for opening and closing motions to control bleed-off of said rotating direction control valve (29), wherein an outlet of a center bypassing oil path for return of a main pressure oil, said center bypassing path extending through a neutral position of said rotating direction control valve (29), and an oil tank (32) are in communication with each other through said cut-off valve (33); a controller (16) adapted to control opening and closing of said cut-off valve (33) on the basis of detection signals from said posture detecting means and rotating operation detecting means (42L,42R), said controller (16) providing an operation command signal to an electromagnetic proportional pressure controlling valve (35) in such a manner that an operation command pilot pressure is provided to said pilot port (34) of the cut-off valve (33).

    摘要翻译: 一种建筑机械,包括一个下部滑架(12); 一个可转动地安装在上部旋转结构(14)上的工作附件(17); 以及姿态检测装置,用于检测所述工作附件的姿态,其特征在于,所述建筑机械具有控制电路,所述控制电路包括:用于控制所述上部旋转结构的旋转的旋转方向控制阀(29) 作为用于开闭运动来控制所述旋转方向控制阀(29)的泄放的截止阀(33)的卸载阀,其中用于主压力油返回的中央旁通油路的出口, (29)的中立位置的中心旁通通路和油箱(32)通过所述截止阀(33)相互连通;所述中央旁通路径延伸穿过所述旋转方向控制阀(29)的中间位置。 控制器(16),用于根据来自所述姿势检测装置和旋转操作检测装置(42L,42R)的检测信号控制所述截止阀(33)的打开和关闭,所述控制器(16)提供操作 向所述电磁比例压力控制阀(35)发送指令信号,以便向所述截止阀(33)的所述先导端口(34)提供操作指令先导压力。