| 摘要 |
PURPOSE:To obtain an easy control of opening and closing of a gate plate by a remote operation so that the gate plate has an arbitrary preset opening degree. CONSTITUTION:Under ''100% operation command'' where the gate plate is opened entirely, a first switch 75 closes, a second switch 77 closes, and a third switch 76 opens. Accordingly, a solenoid 11 becomes OFF, causing a following stopper 10 to be released, and an electromagnetic valve 31 becomes ON, causing a pressurized fluid to be supplied into a cylinder 24. As a consequence of this, the gate plate 1 opens entirely. On the other hand, under ''N% operation command'', the first and third switches 75 and 76 are closed, whereas the solenoid 11 and electromagnetic valve 31 are both ON. Accordingly, the solenoid 11 becomes operative, so that the following stopper 10 is not released. On the other hand, the electromagnetic valve 31 turns ON, so that the pressurized fluid is supplied into the cylinder 24. As a result of this, in spite that the cylinder is supplied with the pressurized fluid, an arm 14 engages with the stopper 10 to retain the gate plate 1 at an opening degree of N% as shown in a figure. |
