| 摘要 |
PROBLEM TO BE SOLVED: To decrease vibration using simple constitution and to facilitate control of an electric motor when the speed of a car is small. SOLUTION: This control device for a hydraulic elevator includes a hydraulic pump 12 driven by an electric motor 13 at variable speeds, a hydraulic cylinder 11 raising and lowering a car, and control valves 14, 15 connected between the hydraulic pump and the hydraulic cylinder, and is designed so that when the hydraulic cylinder rises, pressure oil discharged from the hydraulic pump is supplied into the hydraulic cylinder through the control valves, and that when the hydraulic cylinder descends, the pressure oil in the hydraulic cylinder is discharged through the control valves and the hydraulic pump. In this case, a bleedoff passage consisting of a throttle valve 16 and a solenoid control valve 17 is provided parallel to the hydraulic pump 12. |
