JPH0157319B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support device for a guide tube that connects a nuclear power generation device and an inspection device that performs necessary inspections thereof.

Strict quality control is carried out on the components of nuclear power generation equipment, but in the unlikely event that defects such as cracks occur in the materials due to the usage conditions of the equipment,
You must discover it quickly. Therefore, it is necessary to perform periodic or occasional inspections over the entire period of use of the power generation equipment, ie, inspections during the service life. However, for this inspection, remote control and telemetry are required because it is dangerous for people to approach and inspect nuclear power plant equipment that may be contaminated with radioactive materials. Therefore, it is necessary to send in a measuring device from an inspection device located far from the nuclear power plant, and to perform the inspection while operating this measuring device. This requires a pipe that connects the nuclear power generation equipment and the inspection equipment.During an inspection, this pipe connects the nuclear power generation equipment and the inspection equipment, and the measuring equipment is sent along a rail installed in the pipe. When not in use, remove this pipe and plug it to prevent radiation from escaping. An example of the connection relationship between the above-mentioned nuclear power generation equipment and inspection equipment and the principle of inspection during the service period will be explained with reference to FIG. In order to prevent radiation leakage from the reactor vessel 1 of a nuclear power plant installed underground and the inlet pipe 2 attached to it, a protective vessel 3 and a protective tube 4 are integrally connected to the reactor vessel 1 and the inlet pipe 2. One end of a guide tube 8 inserted through a through hole 7 made from an exercise floor 6 is connected to a guide tube 5 that covers the inlet tube 2 and connects to this protective tube 4, and the other end is connected to an inspection device 9 installed on the exercise floor 6. Therefore, when installing a guide tube 8 equipped with a running rail 10 on which a measuring device (not shown) passes during inspection, first insert the guide tube 8 through the through hole 7 and fit it into the guide tube 5 located below. Attach. At this time, the guide tube 8 is supported only by the lower guide tube 5, and the upper portion is free, so the guide tube 8 is in a very unstable state. Therefore, it becomes necessary to support the guide tube 5 also above it. Conversely, the same thing can be said when the inspection device 9 is removed from the guide tube 8. As a means for supporting the guide tube 8 from the inner wall surface of the through hole 7, a pressing device or the like may be used in some way, but in order to easily implement this, It is sufficient that the axes coincide, that is, the distance from the outer peripheral surface of the guide tube 8 to the inner wall surface of the through hole 7 is constant. However, there are cases where the axis of the guide tube 5 and the axis of the through hole 7 do not match due to misalignment of the axis of the guide tube 5 or the position of the through hole 7 due to an installation error of the protective vessel 3, or when the reactor 11 starts operating. Since there is a possibility that the axis will shift due to elongation due to the generated heat, etc., the through hole 7 is actually inserted into the guide tube 8.
It is quite difficult to attach a support device to the device, and it has not been practiced in the past.

Therefore, the present invention aims to provide a device in which even if the guide tube 5, that is, the guide tube 8, and the through hole 7 are eccentric as described above, the guide tube 8 is supported according to the eccentricity. The purpose and gist thereof is to provide an inner cylindrical body that is positioned in a passage for passing a measuring instrument and has a running rail inside which moves the measuring instrument, and a bearing on the outer periphery of the inner cylindrical body. an inner eccentric cylindrical body rotatably fitted through a bearing and having an outer circumferential surface eccentric to the inner circumferential surface; an outer eccentric cylindrical body eccentric to the peripheral surface; an outer cylindrical body rotatably fitted to the outer periphery of the outer eccentric cylindrical body via a bearing; and a slider crank device which presses the inner wall of the passage and fixes the outer cylindrical body with respect to the passage by the reaction force.

Hereinafter, an embodiment in which the present invention is used to support a guide tube 8 of a nuclear power generating apparatus shown in FIG. 1 will be described in detail. A second diagram showing a plan view of an embodiment of the device.
In Figure A and Figure B showing the cross-sectional structure thereof, these show the maximum eccentricity state. On the outer periphery of a cylindrical guide tube 8 on which a traveling rail 10 for a measuring instrument (not shown) is attached along the axial direction, there is an inner eccentric cylinder 12 whose outer circumferential surface is eccentric with respect to the inner circumferential surface. are rotatably fitted via a pair of first bearings 13. An outer eccentric cylinder 14 whose outer peripheral surface is eccentric with respect to the inner peripheral surface is rotatably fitted to the outer periphery of the inner eccentric cylinder 12 via a pair of second bearings 15 . Furthermore, this outer eccentric cylindrical body 1
An outer ring body 17 is rotatably fitted to the outer periphery of the through hole 7 via a pair of third bearings 16. At least three (three in this embodiment) slider crank devices 18 for fixing the outer ring body 17 to the through hole 7 are provided at equal intervals. First bearing 13, second bearing 15, third bearing 16
The steel balls constituting the cylindrical body are supported at four points, and as shown in Fig. 2C, which is an enlarged view of this part, two of the supporting points are connected to the V-groove 19 formed on either side of the opposing cylindrical body. The remaining two opposing support points are screwed into the notch end surface 21 of the incompletely threaded part of the internally threaded part 20 provided on the other cylindrical body. It consists of a chamfered end surface 23 of an annular fixing nut 22. These bearings 13, 15, and 16 allow the guide cylinder 8, inner eccentric cylinder 12, outer eccentric cylinder 14, and outer ring body 17 to rotate independently, so the outer ring body 17 is fixed here. At the same time, when the axis of the guide cylinder 8 is at its maximum eccentricity with respect to the outer ring body 17, the axis of the outer circumference of the inner eccentric cylinder body 12 is at the position of , and the axis of the outer circumference of the outer eccentric cylinder body 14, that is, the outer ring The axis of the body 17 is at the position. If the inner eccentric cylinder 12 is rotated with respect to the outer eccentric cylinder 14 from this state, the axis of the guide cylinder 8 will draw a trajectory. Further, when the outer eccentric cylinder body 14 is rotated with respect to the outer ring body 17, the axis of the outer circumference of the inner eccentric cylinder body 12 draws a trajectory'. Therefore, the range in which the axis of the guide tube 8 can move is the crossed hatched area in the figure. On the other hand, if the guide tube 7 is used as a reference, the axis of the outer ring body 17 can be eccentrically moved at the intersecting hatched portion. On the other hand, the slider crank device 18 includes a slider 25 that reciprocates along a guide portion 24 provided on the outer ring body 17, and an intermediate section 27 whose one end is connected to the slider 25 with a pin 26.
It consists of a link 28 whose one end is connected to the other end of the intermediate section 27 by a pin 26, and the other end of the link 28 is rotatably supported by the outer wheel body 17 via a hinge 29. In this embodiment, the slider crank devices 18 are housed in grooves 30 provided along the axial direction on the outer circumference of the outer ring body 17, so that they are made compact together with the bearing. Of course, there may be three or more slider crank devices 18. Then, the slider 25 is moved to the hinge 2 by a drive device (not shown) using hydraulic pressure, pneumatic pressure, etc.
By pushing to the 9 side, the intermediate node 27 and link 28
A connecting portion 31 with the connecting portion 31 protrudes in the radial direction.

The lower end of the guide tube 8 on which this device is attached above is adjusted and connected so that the running rail 9 is connected to the guide tube 5 as shown in FIG. Then, the three sliders 25 are simultaneously driven to push out the respective connecting portions 31 in the radial direction, that is, toward the inner wall surface of the through hole 7. At this time, if the axis of the through hole 7 and the axis of the guide tube 8 are misaligned,
There is a possibility that the connecting portion 31 at one location contacts the inner wall surface of the through hole 7 first. At that time, the connecting portion 31
receives the reaction force from the wall surface and the outer ring body 17 moves in that direction. This force was received by the outer eccentric cylinder 14 and the inner eccentric cylinder 12, but they were semi-forcibly rotated by the reaction force from the guide cylinder 8, and the outer ring body 17 moved eccentrically to the guide cylinder 8 in the fixed position. stable in the state. As the three connecting portions 31 are further pushed out, the outer ring body 17 is eventually fixed to the through hole 7, and at the same time, the guide tube 8 is also supported thereby. In other words, since the long guide tube 8 only has its lower end attached to the upper part of the guide tube 5, the upper end of the guide tube 8 will wobble and become very unstable. For this reason, the workability is a little inferior, but since the upper end of the guide tube 8 is supported relative to the through hole 7 by this device, the subsequent work becomes easy. At this time, the slider 25 is locked by some method. If it is desired to fix the inner eccentric cylindrical body 12 and the outer eccentric cylindrical body 14 after the alignment is completed, they can be fixed using a fixing device (not shown), for example, by inserting a pin.

As explained above, since this device is easily supported by the through hole even when the guide tube is eccentric with respect to the through hole, the guide tube can be easily attached and removed. Even if the eccentric state changes for some reason after installation, the outer eccentric cylinder and the inner eccentric cylinder are rotated semi-forcibly, so it can be accommodated.

[Brief explanation of drawings]

Fig. 1 is an example showing the state of the connection between the nuclear power generation equipment and the inspection equipment, and a schematic explanatory diagram in which the present equipment is used as an example in the guide tube of the connection part.
Figure A is a plan view of an embodiment of the present invention, Figure B is a front sectional structural view thereof, and Figure C is an enlarged view of the bearing section. In the drawing, 7 is a through hole, 8 is a guide cylinder, 10 is a running rail, 12 is an inner eccentric cylinder, 13 is a first bearing, 1
4 is an outer eccentric cylinder body, 15 is a second bearing, 16 is a third bearing, 17 is an outer ring body, and 18 is a slider crank device.

Claims (1)

[Claims] 1. An inner cylindrical body positioned in a passage for passing a measuring device and to which a running rail for moving the measuring device is attached; an inner eccentric cylinder whose outer peripheral surface is eccentric with respect to the inner peripheral surface; and an outer eccentric cylinder which is rotatably fitted to the outer periphery of the inner eccentric cylinder via a bearing and whose outer peripheral surface is eccentric with respect to the inner peripheral surface. an eccentric cylindrical body; an outer cylindrical body rotatably fitted to the outer periphery of the outer eccentric cylindrical body via a bearing; and a slider crank device that fixes the outer cylindrical body to the passageway by a reaction force thereof.