| 摘要 |
PURPOSE:To enable the operation of an hydraulic elevator without impact by judging the start of operation of a hydraulic actuator based on the set flow rate and controlling speed of a car in accordance with the set pressure until the hydraulic actuator starts its operation and based on the set flow rate after its operation is started. CONSTITUTION:In a controller of a hydraulic elevator which controls supply and discharge of hydraulic oil to a hydraulic actuator 50 which makes a car 2 ascend and descend by a control valve 60, it is provided with a pressure detection means 51 and a flow rate detection means 52 which detect pressure and flow rate of hydraulic operating fluid, respectively. It is also provided with a pressure setting means 53 and a flow rate setting means 55 which set pressure and flow rate in accordance with time, respectively, to generate drive signals by drive signal generating means 54, 56 based on each set value of pressure and flow rate and detected values. The flow rate set value and the flow rate detected value are compared by a comparison means 58. A drive signal based on pressure when it is judged that the operation of the hydraulic actuator is started and a drive signal based on flow rate after the operation is started are selected respectively by a change-over means 57 to control the control valve 60. |
