JPS5952774B2 - In-liquid inspection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a submerged inspection device for inspecting the surface or interior of a portion of a nuclear power related pressure vessel that is immersed in liquid.

In general, nuclear power-related pressure vessels require rigorous non-destructive inspection, but inspection of the internal surface of the vessel is difficult due to the radioactive atmosphere, and conventionally it has been difficult to inspect the internal surface of the vessel using a television camera or etc. are inserted into the container to observe the surface condition.

However, when the internal surface of the container is dirty, such as when the liquid is not transparent, such as oil, it is extremely difficult to observe. This invention was made in view of the above circumstances, and its purpose is to easily and accurately inspect the surface of an object to be inspected even when the surface to be inspected is dirty or the liquid has poor transparency. It provides equipment.

That is, the present invention allows the inspection mechanism to inspect the surface or interior of the inspected member by placing the opening periphery of an inspection box with a built-in inspection mechanism and opening on one side in close contact with the inspected object provided in the liquid. In the submerged inspection apparatus, a first annular packing that can be protruded and retracted into close contact with the surface of the object to be inspected is provided at the opening periphery of the inspection box, and a second annular packing that is attached to the inside of the first annular packing. and an air supply/exhaust port through which air or liquid flows in and out in the gap formed between both packings, so as to form an airtight air shielded from the liquid in the inspection part of the object to be inspected. This is an in-liquid inspection device. An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a cylindrical container filled with a liquid 2, and a surface inspection device 3 according to the present invention is attached to this container 1.

This device 3 includes a leg member 4 attached to the upper edge of the opening of the container 1.
, connect the main pillar member 5 immersed in the liquid 2 of the container 1,
Furthermore, an inspection box 7 that contacts the inner surface of the container 1 is attached to the cylindrical member 6 inserted through the main pillar member. The main pillar member 5 is rotationally driven by a motor 8, and the rotation of the main pillar member 5 causes the inspection box 7 to rotate in the circumferential direction of the container 1 together with the cylindrical member 6. Further, the cylindrical member 6 connects a rope 10 wound around a drum 9. By rotating the drum 9 with a motor 11, the rope 10 is connected to the drum 9.
The cylindrical member 5 is guided by the protrusions 5a of the main pillar member 5 and moves up and down, and the vertical movement of the protrusion 6 allows the inspection box 7 to move in the vertical direction. Further, to explain the inspection box 7 in detail, the inspection box 7 has an open surface that contacts the container 1, and the opening peripheral edge 7a is shaped to follow the curved shape of the inner surface of the container 1. It is rotatably attached to a support rod 6a protruding from the support rod 6a. A tension coil spring 7 is installed between the support rod 6a and the back surface of the inspection box 7.
The inspection box 7 is supported by the support rod 6a by the tensile force of these coil springs 7B and 7b. Furthermore, the inspection box 7 has a built-in inspection mechanism 12. This inspection mechanism] 2 is a brush 13 shown in FIG.
It is configured to include an illuminator 14 and a visual camera 15 shown in FIG. The brush 13 is used to clean the inner surface of the container 1 and is designed to be able to move freely around the opening of the inspection box 7. That is, the brush 13 is configured such that a brush rod 13a attached to the back side is connected to a motor 17 attached to a movable table 16, and the brush 13 is rotationally driven by this motor 17. Further, the moving table] 6 meshes with a threaded rod 18, and by rotating this threaded rod 16 with a motor 20 attached to a rotary plate 19, the brush 13 is moved to the moving table 1.
6 along the guide wall 19a of the rotary plate 19. Furthermore, the rotating plate 19 is connected to the inspection box 7.
Motor 2 meshes with a fixed shaft 21 fixed to the inner surface of
It is designed to rotate by 4. In addition, 13b in the figure
is a compression coil spring that presses the brush 13 toward the inner surface of the container 1 (in the direction of the arrow).

Further, on the rotary plate 19, as shown in FIG. 3, there is an illuminator 14 for illuminating the inner surface of the container, and an eye for observing the inner surface of the container. A viewing camera 15 is attached. Note that the above motors 17, 20
, 24, the electric wires 25 connected to the illuminator 14 and the visual camera 15 are gathered together in the protection tube 26, led out to the outside of the inspection box 7, and connected to a power source, respectively. Furthermore, an inspection box is placed in contact with the inner surface of the container 1. 7 is provided with double grooves 27 and 28 on its opening peripheral edge 7a. A first annular packing 30 is attached to the outer groove 27 via a compression coil spring 29, and this annular packing 30 can be freely protruded and retracted along the inner surface shape of the container 1 by the pressing force of the compression coil spring 29. It's summery. Furthermore, a second annular packing 31 is attached to the inner groove 28, and this annular packing 31 is fixed in a state protruding from the opening peripheral edge 7a. The first annular packing 30 and the second annular packing 3
A supply/discharge port 33 of a supply/exhaust passage 32 is opened in the gap between the supply and exhaust passage 32 and the supply/exhaust passage 32 . The supply/exhaust passage 32 is connected to a supply/exhaust hose 34, and this hose 34 is connected to a supply/exhaust pump (not shown) provided outside the device to send air to the gap, or to supply liquid to the gap. It is now possible to emit .
Note that 35 in FIG. 4 is a detector for detecting the position of the movable table 16. Next, the operation of the device of the present invention will be explained.

The inspection box 7 is moved to a desired position on the inner surface of the container 1 by driving the motors 8, ]1, respectively. In this case, the inspection box 7 that comes into contact with the inner surface of the container 1 has an opening periphery 7a that follows the shape of the inner surface of the container 1, and is elastically supported by the support rod 6a, so that it is in close contact with the inner surface of the container 1. Moving. Further, the first annular packing 30 provided at the opening peripheral edge 7a is subjected to surface pressure by a compression coil spring 29, and the gap between the first annular packing 30 and the second annular packing 31 is provided with an air supply/exhaust hose 34. A pressure equal to the pressure of the liquid 2 is applied by air supplied from the first annular packing 30.
Liquid leakage is unlikely to occur. Moreover, even if liquid leaks from the first annular packing 30, the second annular packing 31
This prevents this liquid 2 from entering the inspection box 7.
The inside of the inspection box 7 can be maintained liquid-tight. Further, the liquid that has entered through the first annular packing 30 is removed by suctioning it through the supply/exhaust port 33. After positioning the inspection box 7 in a liquid-tight state in this way, the motor 1
7, 20, and 24 are driven to clean the inner surface of the container 1, and a surface inspection is performed by shining light onto the cleaned surface with an illuminator 14 and observing it with a visual camera 15.

Note that the second annular packing according to the present invention is not limited to the above-mentioned embodiment, and may have a structure that can be protruded and retracted like the first annular packing.

Further, the inspection box of the present invention has the brush 13 as in the above embodiment.
In addition to being equipped with an illuminator 14 and a visual camera 15 to observe the surface, it is also equipped with a mechanism for spraying a dye penetrating liquid, a fluorescent penetrating liquid, etc., a mechanism for developing the same, and a penetrant inspection method to inspect the surface. It may be possible to inspect the object, or a grinder or a welding machine may be provided so that the object to be inspected can be repaired. As explained above, according to the present invention, a double packing ring is formed on the periphery of the opening of the inspection box in contact with the object to be inspected, and the first packing ring provided on the outside is formed so as to be freely protrusive and retractable. By providing an air supply/exhaust port in the gap between the rings, this gap can be made to have the same pressure as the outside pressure, so there is no possibility of liquid leaking into the test box from the outside, and the surface of the surface to be inspected can be maintained. can be easily and accurately inspected.

In addition, even if liquid leaks from the first packing ring, it can be absorbed and removed from the air supply and exhaust ports, providing a remarkable effect.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is an overall view of a submerged testing device attached to a container showing one embodiment of the present invention, Fig. 2 is an enlarged sectional view of the test box shown in Fig. 1, and Fig. 3 is a sectional view taken along line 111-111 in Fig. 2,
FIG. 4 is a sectional view taken along line I-1V in FIG. 3. 1... Container, 2... Liquid, 3... In-liquid inspection device,
7... Inspection box, 7a... Opening periphery,] 2... Inspection mechanism, 13... Brush, 14... Illuminator, 15...
...Visual camera, 27, 28...Groove, 29...
Compression coil spring, 30...first annular packing, 3
1... Second annular packing, 32... Supply and exhaust passage,
33... Supply/exhaust port.

Claims (1)

[Claims] 1 In-liquid inspection in which the opening periphery of an inspection box with a built-in inspection mechanism and one side open is brought into close contact with an object to be inspected submerged in liquid, and the inspection mechanism inspects the surface or interior of the object to be inspected. In the apparatus, a first annular packing that can be protruded and retracted into close contact with the surface of the object to be inspected is provided at the periphery of the opening of the inspection box;
A second annular packing is provided inside each of the first packings, and an air supply/distribution port is provided through which air or liquid flows in and out of a gap formed between both packings,
A submerged inspection device that forms an airtight space that is isolated from the liquid in an inspection portion of an object to be inspected.