| 摘要 |
PURPOSE:To exactly synchronize the rotations of a slewing base and a working base by a method in which the rotation angles of the slewing base and the working base are detected, and on the results of calculation and processing of the detected values by a signal processor, the action of the oil-pressure motor of the slewing base is controlled. CONSTITUTION:To rotate a slewing base 14 and a working base 20, switches 62 and 63 are closed, a relay 67 is closed by a drive circuit 66, and current is supplied to a solenoid 68. A solenoid valve is actuated by the solenoid 68, oil pressure is supplied to an oil-pressure motor 41, and the working base 20 is operated in relation to the slewing base 14. On the other hand, a relay 76 is closed by a drive circuit 75, a solenoid 77 is operated, and the slewing base 14 is turned in relation to the vehicular body 10. In this case, the rotation angles of the slewing base 14 and the working base 20 are detected by magnetic pickups 53 and 54, the detected values are calculated and processed in a comparision and coincidence circuit 73, and on the basis of the processed results, the solenoid 77 and the oil-pressure motor 18 are stepwisely controlled in order to minimize the error of the synchronous rotations of the slewing base 14 and the working base 20. |
