JPS6231562B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support device for an electric transmission cable that supplies power to an inspection vehicle running inside a nuclear reactor containment vessel.

As shown in FIG. 1, a nuclear power plant reactor includes a reactor pressure vessel 2 containing a reactor core,
In the outer space 3 of the reactor pressure vessel, various devices, valve devices, piping, etc. are arranged, and further outside thereof, the reactor containment vessel 1 is arranged.
This reactor containment vessel 1 has an airtight structure to prevent radiation from leaking to the outside, and it is impossible for workers to enter the inside during operation.

However, from the standpoint of safe operation of nuclear reactors,
It is required that various devices, valve devices, piping, etc. installed in the reactor containment vessel 1 be inspected periodically. For this reason, recently, a traveling rail 4 is installed inside the reactor containment vessel 1, and an inspection vehicle 5 is run along this rail 4, and various equipment such as an ITV camera, thermometer, dosimeter, microphone, etc. are installed on this inspection vehicle. Reactor containment vessel inspection equipment is being developed that is equipped with measuring instruments for inspection, runs unmanned, and transmits various information from the necessary locations to the outside.

In this type of inspection equipment, the inspection vehicle 5 equipped with an ITV camera, thermometer, dosimeter, etc.
In order to run the inspection vehicle for a certain amount of time, power is supplied to the inspection vehicle and signals are exchanged using a movable electric transmission cable 1 that connects the ground side (fixed side) and the moving inspection vehicle.
It must be done using 2.

However, the rails 4 on which the inspection vehicle runs must be constructed so as not to interfere with the various equipment and piping inside the reactor containment vessel 1, so the rails 4 are complex, including curves, slopes, etc. There was a problem in that it was difficult to support the transmission cable 12 as it moved.

Conventionally, as shown in detail in FIGS. 1 and 2, a drive chain 6 is provided above the running rail 4,
From this drive chain 6, cable hangers 8, 8,
..., 8 were suspended, and the lower ends of these hangers 8 supported the electric transmission cable 12. However, in the case of such a support device, there is a risk that the cable hanger 8 may come into contact with surrounding equipment, and if the cable hanger 8 is subjected to an earthquake while being moved, the cable hanger 8 may sway laterally. There was also a risk that the transmission cable 12 would come off.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a device that can support an electric transmission cable that supplies power to an inspection vehicle that moves along a running track installed in a nuclear reactor containment vessel without taking up a large space.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A support device for an electric transmission cable for supplying electric power to an inspection vehicle traveling inside a nuclear reactor containment vessel according to the present invention will be described below with reference to FIG. 1 and FIGS. 3 to 5.

In FIG. 1, reference numeral 1 indicates a reactor containment vessel, and a reactor pressure vessel 2 is disposed inside this reactor containment vessel 1. Although not shown, an annular space 3 between the two is arranged. The interior is equipped with various equipment, valve devices, piping, etc.

Inside the annular space 3, the reactor pressure vessel 2
An annular running rail 4 that surrounds the rail is constructed, and this running rail 4 is made of a steel section with an H-shaped cross section, and is oriented so that its flange portion coincides with the horizontal plane. This traveling rail 4 includes a rail 4
An inspection vehicle 5 that can be moved along is suspended,
The inspection vehicle 5 is equipped with various measuring instruments such as an ITV camera, a thermometer, a dosimeter, and a microphone.

An annular drive chain 6 is disposed above the traveling rail 4 at a predetermined distance, and the drive chain 6 and the inspection vehicle 5 are connected by a connecting rod 7.

As a result, when the drive chain 6 is running, the inspection vehicle 5 can be moved around the reactor pressure vessel 2 along the running track 4.

Since the drive chain 6 cannot be supported in space as it is, in this embodiment, as is clear from FIG. 4, the drive chain 6 is rigidly fixed to an annular guide tube 9. It is now possible to run inside the passageway.

The drive chain 6 is driven by a chain drive device 10, and although not shown in the drawings, the drive chain 6 includes a drive sprocket wheel rotated by a motor.

By the way, in order to supply power to the inspection vehicle 5 or transfer information to the outside, the inspection vehicle 5 has a cable storage section 11 installed on the fixed side.
An electric transmission cable 12 is let out from there, and the tip of this electric transmission cable 12 is connected to an input/output terminal of the inspection vehicle 5.

As is clear from FIG. 3, the drive chain 6 includes a large number of chain links 14, 14,...14.
are connected by pins, and a rolling roller 15 is rotatably attached to the center of each chain link 14, and these rolling rollers 15, 15, . It's getting old. The rolling rollers 15 are arranged so that the directions of the rotational axes of adjacent rollers are alternately perpendicular to each other, thereby preventing the drive chain 6 running in the guide tube 9 from swinging back and forth and left and right.

Rolling roller 1 for the chain link 14
5 is shown in detail in FIG.
Rolling rollers 15, 15 are rotatably attached to both ends of the chain link 14, and a receiving metal fitting 18 is attached between the chain links 14, 14. This receiving metal fitting 18
As shown in FIG. 4, the lower end base 18a
The gripping pieces 18b, 18b extend upward from both ends in a substantially parallel manner, and arc-shaped gripping portions 18c, 18c are formed halfway outward. Preferably, the receiving fitting 18 is made of a resilient material, such as spring steel. Such a receiving metal fitting 1
8 is preferably mounted on the central axis of the rolling rollers 15, 15 of the drive chain 6 with the opening facing upward so as not to rotate.

According to the present invention, the electric transmission cable 12 for supplying power to the inspection vehicle 5 is repeatedly routed from the cable storage section 11, and as shown in FIG. The above-mentioned series of receiving fittings 18, 18,...18
While being pushed in and supported by the receiving fittings 18, 18, .

As is clear from FIG.
It protrudes into the guide tube 9 through the notch 9a.
Then, the above-mentioned receiving metal fitting 1 on the drive chain 6
8. The clamping pieces 18b, 18b pass over the outer periphery of the pulley 19 during running.

Since the present invention is configured as described above, the electric transmission cable 12 let out from the cable storage section 11 is routed around the unout pulley 19 and then inserted into the guide tube 9 through the notch 9a of the guide tube 9. be guided. A drive chain 6 runs within the guide tube 9, and receiving fittings 8, 18, . . . , 18 are mounted on the drive chain 6 with their openings facing upward. These receiving metal fittings 18 are
The tips of b and 18b pass through the outer periphery of the feeding pulley 19, and immediately after passing, the receiving metal fitting 18
The clamping pieces 18b, 18b are restored inward and grip the transmission cable 12. Then, the transmission cable 1
2 runs inside the guide tube 9 together with the drive chain 6 while being held by the receiving fittings 18, 18, . . . 18. As is clear from FIG. 3, the tip end of the electric transmission cable 12 is connected to the input/output terminal of the inspection vehicle 5.

As described above, according to the present invention, the electrical transmission cable from the storage section can be delivered to the receiving metal fitting on the drive chain via the pulley, and then the electrical transmission cable can be supported by the receiving metal fitting on the driving chain. . Therefore, since the electric transmission cable is passed through the guide tube, the electric transmission cable does not hang down and can be supported compactly, which is convenient for transporting through a narrow space inside the reactor containment vessel. Furthermore, the power transmission cable does not interfere with various surrounding equipment, piping, etc., and the power transmission cable does not sway laterally even during an earthquake.

In the above embodiment, the receiving metal fitting is attached to the drive chain with the opening facing upward, but it does not necessarily have to be provided at the top, and may be installed facing downward, or facing sideways. Of course, it may also be installed by

[Brief explanation of the drawing]

Fig. 1 is a perspective view schematically showing the structure inside the reactor containment vessel to which the present invention is applied, Fig. 2 is a side view showing a conventional cable hanger, and Fig. 3 is an inspection vehicle and drive according to the present invention. FIG. 4 is a side view showing the supporting relationship between the chain and the transmission cable, FIG. 4 is a cross-sectional view showing the guide tube and the drive chain, and FIG. 5 is a vertical cross-sectional view showing the guide tube including the feeding pulley and the drive chain. . 1...Reactor containment vessel, 4...Travel rail, 5...
...Inspection vehicle, 6... Drive chain, 11... Cable storage section, 15... Rolling roller, 18... Receiving metal fitting, 19... Feeding pulley.

Claims (1)

[Scope of Claims] 1. In one in which the tip of a transmission cable fed out from a cable storage part is connected to an inspection vehicle movable on a running track by a drive chain;
While a large number of receiving fittings are attached to the drive chain at predetermined intervals, a payout pulley is provided near the cable storage section, and the electric transmission cable fed out from the cable storage section is held by the receiving fitting at the outlet side of the feeding pulley. 1. A support device for a power transmission cable, characterized in that it is configured to 2. Claim 1, characterized in that the receiving metal fitting is fixed on the rotating shaft of the rolling roller provided on the chain link of the drive chain and includes two expandable clamping pieces. The electrical transmission cable support device described in . 3. According to claim 1, the drive chain is provided with a large number of rolling rollers, and the rolling rollers are configured to travel inside the guide tube while rolling inside the guide tube. support equipment for electrical transmission cables. 4. The drive chain is constructed by connecting a number of chain links with pins, and each chain link has a rolling roller, and the rolling rollers are arranged in a relationship perpendicular to each other with respect to the axis of rotation thereof. 2. A support device for a power transmission cable according to claim 1, wherein