| 摘要 |
PURPOSE:To allow an elevator to run always with a proper speed pattern being free from influence of varying oil temp. and pressure by setting a group of parameters pertaining to the speed pattern for each combination of variaous factors influencing the speed pattern, and controlling the rate of flow of the pressure oil on the basis of the applicable group of parameters. CONSTITUTION:The oil pressure and temp. of the pressure oil flowing into and out of a hydraulic jack 2 are sensed by sensors 16, 17 immediately before the start of a hydraulic elevator. Using these values from sensing, a control circuit controls opening and closing of a valve 9 according to a specified speed pattern, and as a result a cage 1 is elevated and sunk with normal speed pattern at all times. When the cage is elevating, that is, the oil amount passing through the valve 9 is increased by a certain amount in case a rise of the oil temp. or pressure has decreased the discharge amount of an oil pressure pump 8, and the oil amount passing through the valve 9 is sunk by a certain amount in the contrary case in which a drop of the oil temp. or pressure has increased the discharge amount of the oil pressure pump 8. |
