JPH0422239B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cleaning device that cleans and removes radioactive substances attached to the surface of a highly radioactive substance storage container (hereinafter referred to as a container) by spraying high-pressure water.

For example, containers containing highly radioactive materials such as clothing contaminated with radioactivity are dumped at sea or disposed of on land.Before disposal, the outer surface of the container is thoroughly cleaned and the surface of the container is Adhering radioactivity is washed away.

Conventional cleaning methods rely on spraying high-pressure water, but since the radioactively contaminated water is scattered around, it is necessary to prepare a dedicated cleaning room with surrounding walls.

Furthermore, in addition to equipment for transporting and unloading highly radioactive material storage containers, remote control equipment necessary for operating and maintaining the washing machine also needs to be installed specifically for the washing room, which ultimately makes the entire washing equipment expensive. There was a drawback that I got used to it.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cleaning device constructed as a single unit type that is compact, inexpensive, easy to operate, and easy to maintain and inspect.

In order to achieve the above object, the cleaning device of the present invention includes an inner case that is telescopically slidable in a substantially vertical direction relative to an outer case with a bottom, and a container containing a highly radioactive material at the upper end of the inner case. The lid for loading and unloading is installed so that it can be opened and closed, creating a closed room (washing room) that can be expanded and contracted to prevent washing water from scattering. In the cleaning chamber surrounded by the inner and outer cases, a rotary table for the container is installed to be rotatable and movable up and down, and a nozzle device for jetting cleaning water is installed vertically.

Therefore, after a container containing highly radioactive materials is brought in and placed on a rotating table, the container is rotated and moved up and down by remote control, and the entire surface is cleaned by spraying high-pressure water with a nozzle device. It can be cleaned efficiently, there is no need to worry about contaminated water scattering, and the structure is simple and does not take up much space, allowing it to achieve its purpose.

Next, the embodiment shown in the figure will be explained.

In FIG. 1, 1 is an outer case in the shape of a rectangular cylinder with a bottom, which is installed on the floor via support legs 2, 2 at the lower end;
3 is an inner case fitted inside the outer case 1, and rollers 4, 4 provided at the lower end of the inner case 3 are in contact with the inner surface of the outer case 1, so that it can be slid vertically (up and down). is set up.

The inner case 3 is raised and lowered using a crane (not shown). Therefore, a dedicated electric device is not required, and the mechanism becomes simpler and reliability is improved. Therefore, 6 is a highly radioactive material storage container housed in the inner case 3, and this is the short container 6.
When cleaning, lower the inner case 3 and remove the tall container 6.
When cleaning, the inner case 3 is pulled up to enlarge the cleaning chamber and cleaning is performed inside the chamber, which provides flexibility and allows for efficient cleaning.

In the figure, reference numeral 5 denotes a lid installed at the upper end of the inner case 3 for carrying in and out of the container 6 and so as to seal the inside watertightly. As shown in FIGS. 2A and 2B, the lid 5 has arms 8 projecting horizontally from its upper end side and a crankshaft 9 fixedly attached to the tips of the arms 8. On the other hand, on the bearing arms 7, 7 fixedly attached to both sides of the upper end of the inner case 3,
Both ends of the crankshaft 9 are rotatably supported,
The lid 5 is configured to open and close around a fulcrum of a crankshaft 9 formed by bearing arms 7, 7.

Cranks 10, 10 and a crank pin (rotatable roller) 11 are attached to an intermediate portion of the crankshaft 9. On the other hand, a motor stand 12 is attached to the upper end side of the inner case 3, and a cam 14 attached to the rotating shaft of an electric motor 13 placed thereon is in contact with the crank pin 11. That is, when the cam 14 rotates clockwise from the fully closed state shown in FIG. 2B, the lid 5 rotates counterclockwise about the crankshaft 9 and opens as the cam lift increases.

The cam 14 is given a displacement curve such that when the cam 14 rotates, the lid 5 opens to a substantially vertical position and then gradually closes again. Thus, with the lid 5 opened until it stands vertically,
The container 6 containing the highly radioactive material is carried out by a crane (not shown).

In order to reduce the load on the opening and closing of the lid 5 caused by the cam 14, one arm 8' is extended long (FIGS. 1 and 2 A), and the rope 15 connected to its tip is connected to the guide sheep 16, 16'. A balance weight 17 is connected to the other end.

Next, 18 in the figure is the outer case 1 and the inner case 3.
and a rotary table installed in a cleaning chamber 19 surrounded by a lid 5. The rotary table 18 is rotatably placed on the lifting table 20. The elevating table 20 is rotatably installed around a fixed shaft 21 that stands upright at the center of the bottom of the outer case 1. For this reason, the elevating table 20 has a cylindrical cam 22 centered on the fixed shaft 21 and a predetermined cam curve on its lower surface, and this cam 22 is mounted on a roller 23 installed on the bottom surface 1a of the outer case 1. I'm riding it.

Also installed in the cleaning chamber 19 is a gear transmission 25 using an electric motor 24 as a power source, and one output end of which is a long cylindrical gear 26, which is connected to a driven gear 27 provided on the outer periphery of the rotary table 18. The other gears 26' are meshed with driven gears 28 provided on the outer periphery of the lifting table 20, respectively.

Therefore, when the electric motor 24 is started, the rotary table 18 is rotated at a predetermined speed, and the highly radioactive substance storage container 6 placed thereon is rotated. At the same time, the lifting table 20 is rotated and moves up and down as the lift of the cam 22 changes, so that the container 6
moves up and down while rotating.

In the figure, 29 is 1 that stands upright from the rotary table 18.
It is a container support consisting of one or more pillars, and serves as a guide when the container 6 is carried in by a crane.If a rope or the like is wrapped around the container 6 using the container support 29 as a support, it can be placed on the rotary table 18 and cleaned. This is useful for preventing the container 6 from falling over at times.

Next, numeral 30 in the figure is a washing water nozzle device installed vertically along the side of the container support 29, and is provided with ejection holes 30a at predetermined pitches. A water supply pipe 31 of high-pressure water introduced from outside the outer case 1 is connected to the upper end of the nozzle device 30. 32 is a frame for supporting the same.

Therefore, high-pressure water is sprayed from the ejection hole 30a of the nozzle device 30 onto the highly radioactive substance storage container 6, which is moving up and down while rotating at a predetermined speed, producing a cleaning effect. Washing waste water is discharged through the drain pipe 32.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of a cleaning device according to the present invention, and FIGS. 2A and 2B are a plan view and a front view showing the main parts of the lid opening/closing mechanism. 1...outer case, 3...inner case, 5...lid,
6...Highly radioactive material storage container, 18...Rotary table, 30...Washing water nozzle device.

Claims (1)

[Scope of Claims] 1. An inner case 3 is installed so as to be slidable in a substantially vertical direction with respect to an outer case 1, and a lid 5 is installed at the upper end of the inner case 3 so as to be openable and closable, thereby forming a highly radioactive material storage container 6.
A rotary table 18 of the highly radioactive material storage container 6 is installed in the interior surrounded by the outer case 1 and the inner case 3 so as to be rotatable and movable up and down, and a nozzle device 30 for jetting cleaning water is installed. A cleaning device for highly radioactive material storage containers, which is installed vertically. 2. The rotary table 18 is rotated by a gear transmission mechanism and raised and lowered by a cam mechanism.
Cleaning equipment for highly radioactive material storage containers as described in Section 2.