| 摘要 |
PROBLEM TO BE SOLVED: To provide a high maintainability hydraulic elevator control device which runs unloaded without moving a car by optimally adjusting unload pressure without adding a new equipment. SOLUTION: This hydraulic elevator control device is provided with a pressure detracting means 5 for a hydraulic cylinder provided between a solenoid switching valve 8 and a hydraulic cylinder 2, and a pressure detecting means 6 for a hydraulic cylinder provided between the solenoid switching valve 8 and a hydraulic pump 9. A controlling device 12 is provided with a pressure command generating circuit which generates pressure commands by the output of the pressure detecting means 5 for the hydraulic cylinder to control an electronic motor 10 to drive the hydraulic pump 9 so that the output Pp of the pressure detecting means 6 of the hydraulic pump 9 follows to the output of the pressure command generating circuit for unload operation to raise the temperature of the oil in an oil tank 11 to a specified value. The pressure command generation circuit, when taking the pressure Pp* of a datum hydraulic pump as the output Pc of the pressure detecting means 5 of the hydraulic cylinder and the value corresponding to the unload pressure of a relief valve 4 as α, outputs Pp*=Pc-α. |
