JPS58165044A - Inspector for inside of container - Google Patents

Abstract

PURPOSE:To facilitate the inspection of the inside of a container from thereoutside by moving a visual inspector inserted into a guide tube prearranged in the container to be inspected while a signal or a lighting power is transmitted through a cable. CONSTITUTION:A guide tube 11 is incorporated beforehand in such a manner as not to interface with an internal structure 7 in the manufacturing of a steam drum 1 with due consideration given to a part to be inspected or a part possibly broken. To inspect the inside of the steam drum 1, a cable winder 45 is placed tentatively near the drum 1 and then as a cable 43 is sent into the guide tube 11 pinched between rollers of a cable feeder 47, a protective cylinder 29 and a visual inspector 30 mounted at the tip thereof moves through the guide tube 11. The condition of the part being inspected illuminated with a lighting lamp 31 enters a camera 35 through a side-view mirror 33 and a video signal is projected on a display screen through the cable 43.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for visually inspecting the inside of a container. Containers, especially pressure vessels, are inspected as necessary or periodically, as damage during use can lead to serious accidents. There are various inspection methods, but there are signs of damage, such as minute cracks.

Visual inspection is useful as it often occurs on the surface of the container shell.

Visual inspection of the outer surface of the container should be avoided.

Visual inspection of the interior surfaces is a must. The method of visual inspection (hereinafter referred to as inspection) of the inner surface or internal structure is the size and shape of the container.

Direct or remote inspections are taken depending on the presence or absence of internal structures. Direct inspection involves removing the lid or manhole cover of a pressure vessel and having an inspector enter the vessel, but since the mounting surface of the lid must withstand a specified pressure, it takes time to install and remove it. It takes. This direct inspection cannot be used effectively if there are internal structures or if entry is harmful to the human body.

For example, nuclear couplants include pressure vessels (reactor vessels, steam generators, etc.) whose interiors are easily contaminated with radioactivity and whose access time for inspectors is strictly limited. In addition, even for remote inspections where inspectors are not physically present, the equipment is large and
A similar problem arises when large lids must be installed and removed (such as internal inspection of PWR reactor vessels).

The present invention has been made in view of the above-mentioned circumstances. That is, the present invention relates to a device having a guide tube with an opening installed in advance in a container, and a visual device inserted into the guide tube and moved by a cable for transmitting signals and lighting power, and a method for remotely driving the visual device. The object of the present invention is to provide a device capable of inspecting the inside of a container from the outside.

The present invention will now be described in detail with reference to preferred embodiments shown in the drawings.

Figures 1 and 2 show (1) the structure of the vessel to be inspected, that is, the steam drum.

To the body or shell 2: 1: Connected to piping (not shown) 1:
.

Various types of nozzles 3.4.5.6".::: are provided protrudingly. Inside the seal 2, there is provided an internal structure 7 whose dimensions are 1. , four guides l are fixed in the sea-2 through the support bracket gates.

The guide pipe 11 is installed in advance when the steam drum 1 is manufactured so as not to interfere with the internal structure 7, considering the part to be inspected or the part where damage may occur. FIG. 3 shows how the guide tube 11 communicates with the outside, and is aligned with the inspection nozzle 13 on the head plate 9 of the steam drum 1. A gate valve 15 and a blind plate 17 are provided at the outer end of the nozzle 13.

Except when inspecting the interior, for example during operation, the gate valve 15 is closed and the blind plate 17 is attached, forming a pressurized passenger compartment in the shell 2. During the inspection, the blind plate 17 is removed,
Gate valve 15 is opened.

4 and 5 show details of the guide tube 11, which has continuous openings or windows at intervals in the axial direction.
There are many. 59th degree, 9yo shoulder', 0,
ga2. Yo, 8 degrees. ,.

-□Same position-'P1. There are 4 LCs in each direction.

However, the size, shape, and number of windows 21 are as follows.

It is determined in consideration of the inspection field of view to be secured and the structural strength of the guide tube 11, and is not limited to the nine embodiments.

The portion without the window 21 forms a boss 23 and is fixed to the shell 2 with a clamp 25 in place.

FIG. 6 shows the viewing device 30 inserted into the guide tube 11.

The visual device 30 includes an illumination light 31 . It consists of a side scope 33 and a television camera 35 at the rear end.

These are surrounded by a protective tube 29. A see-through glass 41 is fitted around the illumination lamp 31 and the side mirror 33, allowing the illumination light to pass through and the image to enter the side mirror 33. The cable 43 extending from the television camera 35 is
It incorporates a power supply cable for the illumination lamp 31 and a video signal transport cable, and is connected to a cable winding device 45 as shown in FIG. A display and a power source (not shown) are connected to the winding device 45.

In order to inspect the inside of the steam drum IQ using the above-mentioned embodiment device, as shown in FIG.
5 is temporarily placed near the steam drum 1. Similarly, the cable feeding device 47 is temporarily placed, and the cable 43 is transferred to the feeding device 470.
Place it between the rollers. Then, the protection tube 29 is set to the guide tube 11 through the opened gate valve 15.

Further, by driving the feeding device 47 and sending the cable 43, the protection tube 29 and the viewing device 30 attached to the tip of the cable 43 move inside the guide tube 11. The state of the part to be inspected illuminated by the illumination lamp 31 is transmitted to the camera 35 via the side scope 33, and the image signal is displayed on the screen of the display via the cable 43.

The position of the visual inspection device 30 and, in turn, the position of the part to be inspected is detected by an encoder or the like attached to the feed device 47. Then, if the above-mentioned operation is performed for all four guide pipes 11, the inspection of the steam drum 1 is completed.

Note that, if necessary, the inspection of some of the guide tubes 11 may be omitted. In addition, if the surface of the part to be inspected cannot be inspected sufficiently because sludge has accumulated on the surface or if it is covered with an oxide film (magnetite, etc.), a high jet Insert the nozzle 51 and high pressure cleaning liquid supply hose 53 into the guide tube 11.

Perform jet cleaning. Thereafter, the inspection is performed by inserting the visual inspection device 30 or the like as described above.

According to the present embodiment described above, the guide tube 11 is passed through the blind plate 17 and the gate valve 15, which can be easily opened and closed, and is equipped with the visual inspection device 30 in advance.
Since the tester only needs to insert the test piece into the machine and move it, there is no need for the inspector to remove the lid and enter, making it possible to complete the test extremely easily and in a short time.

Also, there may be harmful substances (e.g. radioactive substances) inside the steam drum.
If the internal volume is contaminated with lJ'1. "1.
,.

Since the room is isolated from the outside, it is extremely advantageous in terms of maintaining the health of inspection workers.

In the above embodiments, a television camera was used as the viewing device, but similar effects can be achieved even if a fiberscope is used.

[Brief explanation of drawings]

・Figure 1 is a vertical cross-sectional view showing an example of a container to be inspected according to the present invention, Figure 2 is a cross-sectional view corresponding to Figure 1, and Figure 3 is a partially enlarged cross-sectional view of Figure 1. . FIG. 4 is an enlarged view showing a part of an embodiment of the present invention. FIG. 5 is a sectional view taken along the line ■-■ in FIG. 4, FIG. 6 is a partial sectional view showing the main parts of the embodiment of the present invention, and FIG. FIG. 3 is an explanatory diagram of an additionally used device.

Claims (1)

[Claims] A guide tube that is placed in advance inside the container to be inspected and has continuous viewing openings on the side wall, a film-retaining tube that is movably inserted into the guide tube, a visual inspection device installed in the protective tube, and A signal and power carrying cable connected to a viewing device and extending outward through a nuclear guide tube, a feeding device placed outside the vessel to clamp the cable, and a winding device for the cable. An internal inspection device for a container, characterized in that: