JP3652853B2 - Geared limit switch timing adjustment device and geared limit switch replacement method using the device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of replacing geared limit switch uses the timing adjustment apparatus and apparatus geared limit switch, in particular, it causes inherited the timing when updating the geared limit switch in use geared limit switch new those concerning the geared limit switch exchange method of using timing adjustment device and a device for.
[0002]
[Prior art]
An apparatus having a moving body, geared limit switches are used to accurately determine the stop position of the mobile. With reference to FIG. 3, a fuel handling crane of a pressurized water reactor will be described with reference to this use example . In FIG. 3 (a), a fuel handling crane 10 includes a carriage 11 that travels on a rail 1, a trolley 13 that moves in a direction perpendicular to the rail 1, and a multi-stage mast provided on the trolley 13 that extends in the vertical direction. A tube 15 and a fuel suspension gripper (not shown), a wire, a winch, and the like are provided, and the fuel assembly 5 below the water surface 3 is grasped and pulled into the mast tube 15 to be transferred. The fuel handling crane 10 is also provided with a camera mast 17 for observing the relationship between the fuel assembly 5 as an object to be handled and its outer periphery, and has an underwater television camera 19 attached to the tip thereof. The camera mast 17 is a so-called mobile is vertically by the drive unit as described below, including a winding drum 21, that stops at each stop position.
[0003]
An outline of the operation of the fuel handling crane 10 is as follows. FIG. 1A shows a state in which the fuel assembly 5 is drawn into the mast tube 15, and the underwater television camera 19 monitors the lower end of the mast tube 15. (B) The figure conceptually shows a state in which the fuel assembly 5 is placed on the lower core plate 7 inside the reactor vessel (not shown) (except for the trolley etc.). Slightly extended, the underwater television camera 19 is in the upper core monitoring position and is monitoring the upper part of the fuel assembly 5. (C) In the figure, the camera mast 17 is extended to the maximum length, and the underwater television camera 19 is at the core bottom monitoring position. Thus, the camera mast 17 is extended to various lengths, and the underwater television camera 19 takes, for example , seven monitoring positions, that is, stop positions .
[0004]
An apparatus for driving the camera mast 17 as described above has a configuration as shown in FIG. 4, for example. A take-up drum 21 wound with a wire rope 23 having a tip connected to the camera mast 17 is connected to a drum drive mechanism 25 incorporating an electric motor or the like, and is driven to rotate in two directions. A bevel gear 27 is attached to the extension shaft of the winding drum 21 and supported by a bearing 29. The geared limit switch 28 is consolidated meshing through another bevel gear 27 to the bevel gear 27. The geared limit switch 28 incorporates a cam and a stopper, and positions the monitoring position of the above-described underwater television camera 19 from the rotational position of the winding drum 21 using them. Thus, the underwater television camera 19 needs to accurately project the predetermined position of the fuel assembly 5 in the water, and the worker enters the reactor containment vessel that becomes the radiation monitoring area and communicates with the operator on the carriage. fit, is doing the adjustment of the stop timing of geared limit switch 28 for accurate positioning while according to the video of the television camera.
[0005]
[Problems to be solved by the invention]
If necessary to replace the geared limit switch continues to use is Ji live, the timing adjustment of the new geared limit switch enters the reactor cavity of worker containment vessel as described above, the operator on the dolly Contacting them requires a lot of labor and time for each exchange, and there is a risk of radiation exposure due to radioactive contamination in the reactor cavity after the start of operation of the reactor . Accordingly, an object of the present invention, Shin geared limit switch for setting the stop position of the moving body, when the old exchange, the new geared geared limit switch timing adjustment device and that the timing adjustment of the limit switch can be easily performed and to provide a method of replacing geared limit switch using the device.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, according to the present invention, a new and old geared limit switch can be placed so as to face each other, and it extends between both geared limit switches placed on this fixed seat surface. The adjustment shaft comprises an adjustment shaft having a bevel gear, a bevel gear attached to the adjustment shaft, and a bevel gear attached to the tip of the input shaft of both geared limit switches so as to constitute a miter gear. Provided is a geared limit switch timing adjustment device that rotates the shaft to simultaneously rotate the input shafts of the new and old geared limit switches through the configured miter gear to adjust the timing of the new geared limit switches. .
[0007]
Further, according to the present invention, when replacing the geared limit switch for restricting each stop position of the moving body that takes a plurality of stop positions, the timing adjustment device according to claim 1 is used, and the frame is replaced with a new or old one. The geared limit switches are arranged so that their input shafts face each other, and the bevel gears that mesh with the bevel gears of the adjustment shaft and the miter gears are respectively attached to the tips of the input shafts that face each other. Replacing the geared limit switch by rotating the input shaft of the new and old geared limit switch simultaneously via the configured miter gear and shifting the timing of the old geared limit switch to the timing of the new geared limit switch Can be provided .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
Referring to FIGS. 1 and 2, the legged base 31 has a rectangular work upper surface 33, and an adjustment shaft 35 extending in the transverse direction is horizontally supported by two bearings 37. A handle 39 for driving the adjustment shaft 35 is attached to the outer end portion of the adjustment shaft 35 , while a miter gear constituting bevel gear 41 is attached to the inner end portion . Further, on the pedestal 31, a fixed seat surface to which a new geared limit switch 28a shown by a solid line is attached and a fixed seat surface to which an old geared limit switch (shown by a two-dot chain line) 28b to be exchanged is attached are adjusted shafts. It is provided in a symmetrical position with 35 therebetween. This fixed seat surface may be provided with a special seat plate with mounting bolt holes on the work upper surface 33. However, as shown in the figure, a mounting bolt hole is formed on the work upper surface 33 to fix a predetermined portion of the work upper surface 33. It may be formed as a seating surface. When the new and old geared limit switches 28a and 28b are fixed to such a fixed seat surface, their input shafts face each other as shown in the figure.
[0009]
Next, a geared limit switch replacement method will be described together with a procedure for shifting the stop timing of the old geared limit switch 28b to the new geared limit switch 28a using the geared limit switch timing adjusting device having the above-described configuration. First, a new, Fit the by positioning the former of geared limit switches 28a, 28b to each of the fixed seat. The state of attachment in this way is shown in FIG. Then, the bevel gear 27 is removed from the input shafts of the geared limit switches 28 a and 28 b , the miter gear constituting bevel gear 43 is attached, and the miter gear constituting bevel gear 41 of the adjustment shaft 35 is engaged. In the old geared limit switch 28b, the stop timing for the monitoring position of the above-mentioned underwater television camera is set by a plurality of built-in cams and stoppers. Therefore, the new geared limit switch 28a is schematically shown by a plurality of built-in cams. after shifting the stop timing to rotate the handle 39 of the adjustment shaft 35 by hand, by adjusting the detailed stop timing via a miter gear which is configured to set the built-in stopper, set the old geared limit switch 28b The stop timing shift for the monitored position is completed.
[0010]
【The invention's effect】
As described above, according to the present invention, the new and old geared limit switches to be replaced are arranged face to face, and are simultaneously rotated by the rotation of one adjusting shaft through the configured miter gear. since, Ru can be performed shifting of the stop timing of the mobile easily and completely. Therefore , since it is not necessary to readjust the stop timing of the geared limit switch in a device having a moving body as in the prior art, the geared limit switch can be easily replaced in a short time.
[Brief description of the drawings]
FIG. 1 is a plan view showing a timing adjustment device according to an embodiment of the present invention.
FIG. 2 is a side view of the timing adjustment device of FIG . 1 ;
[Figure 3] geared limit switch is used is an operation explanatory view of a fuel handling crane Ru Empire.
4 is a partial plan view showing a use state of a geared limit switch in the fuel handling crane of FIG . 3; FIG.
[Explanation of symbols]
28a New geared limit switch 28b Old geared limit switch 31 Mounting base 33 Work top surface 35 Adjustment shaft 37 Bearing 39 Handle 41, 43 Bevel gear for miter gear configuration

Claims (2)

New, extending between former two geared limit switch mounted on the fixed seat of the fixed seat surface Toko can be placed in geared limit switch facing engagement Migihitsuji of a frame provided with an adjustment shaft having a bevel gear, It consists of a bevel gear attached to this adjustment shaft and a bevel gear attached to the tip of the input shaft of both geared limit switches so as to constitute a miter gear, respectively. The geared limit switch timing adjusting device is characterized in that the input shaft of the new and old geared limit switch is simultaneously rotated to adjust the timing of the new geared limit switch . When exchanging the geared limit switch for restricting each stop position of the moving body which takes a plurality of stop positions , the new and old geared limit switches are faced to the mount using the timing adjustment device according to claim 1. placed, mounted or bevel gears respectively meshing so as to form a bevel gear and each miter gear of the adjusting shaft to the tip of the input shaft that had the opposite, by rotating the adjustment shaft, via a miter gear which is configured new, rotating the input shaft of the old geared limit switch at the same time, the geared limit switch methods exchange characterized by Rukoto shifting the timing of the old geared limit switches on the timing of the new geared limit switch.

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