| 摘要 |
PURPOSE:To facilitate maintenance and inspection, by fitting a feed screw driving gear to the upper bracket of a stay fixed close by a control rod driving gear, and by enlarging a space between two feed screws to pass a movable coil assembly through the space. CONSTITUTION:A fixing stay 20 is fixed at a fixing section 23 close by a movable coil type control rod driving gear D, and a feed screw driving gear 8 is fitted to the upper bracket 21 of the stay 20. Two feed screws 9, 9 are rotationally moved by the feed screw driving gear 8, and an intermediate ring 13 is vertically mover via a nut 12. A space between the feed screws 9, 9 is enlarged larger than the diameter of a movable coil assembly 6, and the hole of a lower bracket 22 is also made large. The movable coil assembly 6 may come near a flange 2 by means of the intermediate ring 13. In this manner, the full length of the apparatus is shortened, and when a pressure pipe 3 is replaced, then the feed screw 9 need not be removed off every time of such occasions and the work is facilitated. |
