| 摘要 |
PURPOSE:To operate an elevator always with proper speed pattern without being influenced by varying temp. and pressure of the oil by comparing the current speed of elevator with the rated speed for it, and giving a speed pattern control command to a speed control device so that the difference given from comparison lessens. CONSTITUTION:Signals from an oil temp. sensor 16 and an oil pressure sensor 17 are fed to a speed control device 13, and a control command is given to a valve 9 on the basis of a specified speed pattern so that a hydraulic jack 2 rises and sinks with specified speed pattern. Therein a speed sensor 18 senses the current speed of elevator for comparison with the rated speed value, and a speed pattern control command is given to the speed control device 13 so that the difference between the two values will lessen. This accomplishes rise and sink of a cage with the rated speed pattern at all times. |
