| 摘要 |
PURPOSE:To rapidly and exactly perform the straight line excavation of the ground by a method in which pressure oil supply rate control means to an arithmetic circuit and each cylinder are provided and the excavation speed and angle of a bucket are set only by an excavating speed setting means and an excavating angle setting means. CONSTITUTION:At the time of straight-line excavation, an excavation angle theta, an excavation speed V, and a bucket angle alpha are set by an excavation angle setting lever 21, an excavating speed setting lever 22, and an angle setting lever 23, respectively. Whereupon, x-axis direction speed component x'c and y-axis direction speed component y'c are put in an arithmetic circuit 28 by the first arithmetic circuit 24. Then, the circuit 28 receives boom angle alpha and arm angle beta-alpha from a boom angle detector 14 and an arm angle detector 15 and sends out rotation speeds alpha', beta'-alpha' and gamma'-beta' necessary for straight-line excavation by a bucket 6 to flow rate control systems 17-19 through the contact side of a switch 29, whereby operating boom, arm, and bucket cylinder 7, 8, and 9 at these rotation speeds. |
