| 摘要 |
PURPOSE: To suppress the generation of noise to enhance efficiency and to reduce work cost by forming a hydraulic pump as a continuous operation and constant delivery pump fitted to the max. consumption quantity and pressure of all of hydraulic drive mechanisms in the max. number of rotations of an electric motor and controlling the electromotor in proportion to the consumption quantity and pressure of the hydraulic drive mechanisms. CONSTITUTION: All of drive mechanism elements 1, 2, 3a, 3b, 4, 5, 6 are constituted as hydraulic drive mechanisms which are connected to a hydraulic medium conduit network 13 through respective direction changeover valves 7, 8, 9, 10, 11, 12. As a hydraulic pump 14, a continuous operation and constant delivery pump is used and the magnitude of the output thereof is set so that the capacity and/or max. pressure corresponding to the max. consumption quantity of all of hydraulic drive mechanisms 1-6 is achieved. The motor 15 driving the hydraulic pump 14 can be controlled in its number of rotations in a stepless or multi- stage fashion over a predetermined number-of-rotation range. The proportional control valve 16 behind the hydraulic pump 14 is controlled by a control mechanism 19 in the same way as the motor 15. |
