| 摘要 |
PURPOSE:To make the amount of excavation keepable in constant all the time, by controlling an oil quantity so as to increase or decrease the traveling rate of a self-propelling device to be hydraulically driven in an inversely proportional manner, accoding to variations in hydraulic power in a hydraulic circuit which drives a screw type excavating device and a transporting device either. CONSTITUTION:In case of such one that mounts a screw type excavating device 9 on the upper part of a crawler type self-propelling device 2 free of swivel motion within a horizontal plane, the self-propelling device 2 and the excavating device 9 are driven each by hydraulic motors 11 and 20 which receive a high pressure hydraulic fluid from each of hydraulic pumps 17 and 18 to be driven a driving source 13 in common. In this case, pressure of the hydraulic fluid discharged out of the hydraulic pump 17 is detected by a pressure detector 22, finding the difference between the setting pressure and this detected one. And, in order to make the amount of excavation constant on the basis of this difference, discharge of the variable displacement hydraulic pump 18 is controlled for increase or decrease. That is to say, a traveling rate of the self-propelling device 2 is increased or decreased in an inversely proportional manner according to variations in the said pressure. |
