CONTROLLER FOR SERVICE MACHINE FOR POWER SHOVEL

摘要

PURPOSE:To reduce a relief loss, by arranging a load detecting means, an automatic excavation re-starting means, and a means adding a linearly excavated section before a residual section when the automatic excavation is completed to come to a specified section after the re-starting. CONSTITUTION:The pump pressure of a service machine is detected, and a load is detected, and the first set value of the pump pressure is set to be slightly less than the value of relief pressure, and when the load of the service machine is increased, then a boom is moved upward before oil is relieved, and the load is reduced. The moving upward of the boom is stopped when the load is reduced to come to a second set value, and after that, with the position for a re-starting point, the automatic excavation of a residual section is re-started. Besides, when the excavation is completed to come to a specified section to an intermediate point or the like, then from an excavated volume due to a reference moving locus, the sum of an excavated volume to the specified section and the excavated volume of the residual section is subtracted; and the linear excavation of a volume component corresponding with the subtracted value is added before the residual section. As a result, even when a locus is corrected, then a constant mass can be excavated.