| 摘要 |
<p>A device for controlling limited-area excavation, wherein an area where a front device (1A) can move is set in advance; a control unit (9) calculates the position and attitude of the front device (1A) based upon signals from angle sensors (8a to 8c); a limit value (a) of the speed of the fore end of a bucket is calculated so as to limit the moving speed of the front device in a direction perpendicular to the boundary of the area, when the front device is close to the boundary of the preset area where the front device is; the limit value (a) is corrected by the load pressure of an arm cylinder (3b) sensed by a pressure sensor (41a); a limit value of the component, normal to the boundary of the preset area, of the speed of the fore end of the bucket moved by a boom is found from the limit value (a); and an operation signal of the boom is so corrected that the speed of the fore end of the bucket moved by the boom does not exceed the limit value. This makes it possible to excavate the preset area up to the boundary without being affected by the hardness of the soil to be excavated by using a simple program.</p> |
