| 摘要 |
PURPOSE:To prevent the occurrence of uncontrollable slewing, by a method wherein a direct signal responding to a control distance and a control direction of a control lever is outputted from a potentiometer to a control valve, and meanwhile, a control signal is outputted by means of a detecting signal for a slewing angle or a stop angle, and the two signals are selected. CONSTITUTION:A potentiometer 6 is coupled to a control lever 5 of a slewing table for interlocking. By means of an output voltage from the potentiometer 6, a first control circuit 7 outputs a signal, responding to the control direction of a control lever 5, to an electromagnetic proportional control valve 10 which controls forward and reverse turning and governing of the slewing table. Meanwhile, the proportional control valve 10 and a second controller 8 outputs a signal so that the slewing table is slewed in a direction responding to control of the control lever 5 and the slewing table stops slewing by means of outputs from an angle to car body detecting sensor 14 and a stop angle to car body setter 15 of the slewing table. Further, a circuit 18 for selecting an output from the first control circuit is installed to the output circuit of the second controller. |
