| 摘要 |
PURPOSE:To simplify a horizontal push-out excavating work and to improve working efficiency, by a method wherein contracting motion of a boom cylinder is controlled according to the control of expansion of an arm cylinder. CONSTITUTION:With an arm lever 11 controlled, an arm lever angle signal 31a responding to a control angle is inputted to an arm control valve 6. Meanwhile, with a boom lever 12 controlled, a boom lever angle signal 32a responding to a control angle is inputted to a boom control valve 10. Further, an automatic horizontal push-out signal generator 33, which inputs an arm lever angle signal 31b only during expansion of an arm cylinder 4, generates an automatic horizontal push-out signal 33a, having intensity proportioning the signal, and adds the push- out signal 33a to a boom lever angle signal 32b, is provided. This enables simplification of horizontal pushing-out work and improvement of the efficiency. |
