JPS6210391A - Opening/closing mechanism of radiation source chamber - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Lord 1 Retired Emperor U! The present invention relates to an opening/closing mechanism for a radiation source chamber, and more particularly to an opening/closing mechanism for a radiation source chamber equipped with a radiation shielding door that can be quickly opened and closed manually.

Conventionally, the shielding wall of the so-called radiation source room that uses the Toyoshu radiation generator and radioactive isotopes has a passageway for people to enter and exit, and this passageway is equipped with a radiation shielding door. . Therefore, we decided to replace the conventional opening/closing mechanism of the radiation source room with a third one.
4 and will be described below with reference to the same figure.

As shown in FIG. 3, steps are provided on both sides and the top surface of the passage 11 of the shielding wall 1, while steps are also formed on both sides and the top surface of the radiation shielding door 2. ing. That is, the difference in level between the radiation shielding door 2 and the passage 11 eliminates any visible gap between the two. The radiation shielding door 2 is moved by a motor or the like on a rail 3 disposed in a direction perpendicular to the longitudinal direction of the shielding wall 1, as shown by arrow A in the figure, so that the passage 11 can be closed or opened. It will be done.

Further, as shown in FIG. 4, the passage 11a of the shielding wall 1a is simply rectangular, and the radiation shielding door 2a has a larger shape than the opening of this passage 11a. That is,
Due to the difference in dimensions between the radiation shielding door 2a and the passage 11a, there is no visible gap between them. The radiation shielding door 2a is moved by a motor or the like as indicated by arrow B in the figure on a rail 3a disposed parallel to the longitudinal direction of the shielding wall 1a, thereby closing and opening the passage 11a. It looks like this.

In the radiation shielding door 2.2a described above, since a drive source such as a motor cannot be used during a power outage, the radiation shielding door 2.2a is moved using a manual handle.

The radiation shielding door 2.2a and the passages 11 and 11a shown in FIGS. The step portion is not formed in the portion where 3a is located, that is, the lower surface.Therefore, there is a gap through which the radiation shielding door 2.2a can be seen between the lower surface of the shielding wall 1.1a and the lower surface of the radiation shielding door 2.2a. There was a drawback that the effect of attenuating radiation leaking from inside the source room to the outside could not be effectively obtained.

In addition, the one-piece radiation shielding door 2.2a is the same as the shielding wall 1.1.
Because it needs to be the same thickness as a, its weight is also over several tons. Therefore, even if manual measures are taken in the event of a power outage, it is impossible to quickly open and close the radiation shielding door 2.2a. Therefore, in accordance with Article 15(3)-2 of the Prime Minister's Office Ordinance of the Act on Prevention of Radiation Hazards Caused by Radioactive Isotopes, etc., the so-called Hazard Prevention Act states, ``To enable persons trapped indoors to escape promptly.'' The disadvantage was that it was not possible to satisfy the requirements of ``take measures to ensure safety.''

This invention was devised in view of the above-mentioned circumstances, and an object of the present invention is to provide an opening/closing mechanism for a radiation source chamber, which can effectively obtain a radiation attenuation effect and also allow rapid escape from the radiation source chamber.

In order to achieve the above-mentioned object of the radiation source room, this invention has a radiation shielding door consisting of an inner door and an outer door, each of which is cantilevered by a hinge on the shielding wall.A passageway extends from the interior of the radiation source room to the exterior. It consists of an inner opening that becomes narrower in width, and an outer opening that communicates with the inner opening and becomes wider from the inside of the radiation source room to the outside.Furthermore, a step is provided on the upper surface of the passage. On the other hand, a tapered step was provided on the bottom surface.

By dividing the radiation shielding door into two parts, an inner door and an outer door, to reduce the weight of each door, and by supporting them cantilevered with hinges, it is possible to separate the inner and outer doors around the hinge. It can be manually rotated to the indoor and outdoor sides of the radiation source chamber with a relatively small force. Furthermore, since steps are formed on the inner peripheral surface of the passageway and the inner and outer doors are shaped to match the passageway, there is no visible gap between the radiation shielding door and the passageway.

Figure 1 is a cross-sectional view showing one embodiment of the present invention, and Figure 2 is a cross-sectional view taken along the line A--A in Figure 1.

In these figures, 10 is a shielding wall of the radiation source chamber 10a, which is made of concrete, for example. This shielding wall 10 has a passage 20 formed therein for people to enter and exit. This passage 20 includes an inner opening 21 that becomes narrower from the inside of the radiation source chamber 10a to the outside, and this inner opening 21.
It is composed of an outer opening 22 that communicates with the radiation source chamber 10a and becomes wider from the inside of the radiation source chamber 10a to the outside. Specifically, both sides of the passage 20 are covered with shielding walls 1 as shown in FIG.
There is a plane perpendicular to 0 and a plane inclined from this plane, and therefore each has a bent shape in the shape of a cross circuit. Further, as shown in FIG. 2, the upper surface of the shielding wall 10 has a step 23 formed near the center of the passage 20 that hangs down perpendicularly to the upper surface, while the lower surface has a step 23 formed on the upper surface. A tapered step 24 is formed at a position corresponding to a certain position.The reason why the six steps 24 are made into a tapered shape is to ensure that the pulley of the transport vehicle moves smoothly, and there is no need for a transport vehicle. In this case, this step 2
4 can also be made in the same way as the step 23 above.

Then, the inner opening 21 and the outer opening 2 of the passage 20
2 is fitted with a radiation shielding door consisting of an inner side 30a and an outer side 30b. The inner side [30a and the outer side 130b are formed in a shape that matches the inner opening 21 and the outer opening 22.

Specifically, the inside m30a and the outside! 30b has a structure in which outer shells 31a and 31b made of iron plates of, for example, about 5 to 10 m, reinforced with a reinforcing iron frame, are filled with concrete or the like. The inner side 130a is supported by a cantilever on the shielding wall 10 with a hinge 40a.

The inner side m30a around this hinge 40a can be opened to the indoor side of the radiation source chamber 10a and can be fitted into the inner opening 21 of the passage 20. On the other hand, outer door 3o
b is cantilever-supported by the shielding wall 10 with a hinge 40b. Centering around this hinge 40b, the outer door 30b can open the radiation source chamber 10a to the outside of the room and fit into the outer opening 22 of the passage 20.

Furthermore, the inner door 30a and the outer door 30b include
Locking mechanisms 5Qa and 50b are respectively provided to keep or release the closed state of the passage 20. The locking mechanisms 5Qa, 50b include pin-on bars 51a, 51b each having a male thread at one end, and the pin-on bars 51
Handle lever 52a fixed to both ends of 8, 51b,
52b, 53a, 53b, and the pin-on bar 51a,
It consists of racks 54a, 54b that mesh with the male screws 51b, and lock members 55a, 55b provided with lock holes 551a, 551b into which protrusions 541a, 541b at the tips of the racks 54a, 54b can be inserted.

The racks 54a and 54b are arranged parallel to the longitudinal direction of the shielding wall 10 on the outer surfaces of the inner FJL 30a and the outer door 30b. The racks 54a, 54b are movable in their longitudinal direction. This rack 54a,
Pin-on bars 51a, 51 in a direction perpendicular to 54b
b is supported by a bearing or the like. child.

The handle levers 52a, 52b at one end of the pin-on bars 51a, 51b are attached to protrude from the outer surfaces of the inner door 30a and the outer door 30b, and the handle levers 52a, 52b at the other end of the pin-on bars 518, 51b
3a and 53b are arranged in recesses 32a and 32b provided on the inner surfaces of the inner door 30a and the outer door 30b, respectively.

Handles 60c and 60b are provided in the recesses 32a and 32b, respectively, and handles 60d and 60a are also attached to the outer surfaces of the inner side a30a and the outer folding door 30b, respectively. Further, lock members 55a, 5
5b is attached to the shielding wall 10.

Next, when entering the radiation source chamber 10a, open the outer door 30.
b. The procedure for sequentially opening the inner door 30a will be explained.

■ Rotate the handle lever 52b in the direction opposite to the moving direction of the clock hands. As a result, the rack 54b engaged with the male thread of the pin-on bar 51b moves in the direction of arrow a in FIG. 1, and the protrusion 541b at the tip of the rack 54b is disengaged from the lock hole 551b.

■ In this state, by pulling the handle 60a, the outer #
30b is centered on the hinge 40b as shown by the arrow in FIG.

rotate in the direction. That is, the outside 1ji 130b opens on the outdoor side of the radiation source chamber 10a. In addition, the outer door 30b is approximately 4
ton, the outer door 30b can be opened with a force of about 10 kg. Needless to say, this also applies to the inner door 30a described below.

(2) Then, the handle lever 5ja of the inner door 30a is rotated in the same direction as the moving direction of the clock hands. This results in
The rack 54a moves in the direction of arrow 'c1' in FIG. 1 via the pin-on bar 51a, and the projection 5 at the tip of the rack 54a moves.
41a is removed from the lock hole 551a.

(2) By pushing the handle 60c in this state, the inner door 30a moves in the direction shown by the arrow d in FIG. 1, centering on the hinge 40a.

rotate in the direction. In other words, the inner door 30a is opened on the indoor side of the radiation source chamber 10a.

- On the other hand, the procedure for sequentially closing the inner door 30a and outer door 30b when exiting from the radiation source room 10a will be explained.

(2) Pull the handle 60c of the inner door 30a and rotate the inner door m30a about the hinge 40a in the direction of arrow d2 in FIG. 1. Thereby, the inner door 30a is fitted into the inner opening 21. Thereafter, the handle lever 53a is rotated in a direction opposite to the moving direction of the clock hands. As a result, the rack 54a that is engaged with the male thread of the pin-on bar 51a moves in the direction of arrow C2 in FIG.
41a is inserted into the lock hole 551a and locked.

■ Push the handle 60a on the outer side 830b and release the hinge 40b.
The outer door 30b is rotated about the center in the direction of arrow C2 in FIG. Thereby, the outer door 30b is fitted into the outer opening 22. Thereafter, the handle lever 52b is rotated in the same direction as the moving direction of the clock hands. As a result, the rack 54b moves in the direction of arrow C2 in FIG. 1 via the pin-on bar 51b, and the protrusion 541b at the tip of the rack 54b is inserted into the lock hole 551b and locked.

Note that, of course, the shape of the passage 20 and the shapes of the inner door 30a and the outer door 30b are not limited to the above embodiments. Furthermore, the locking mechanisms 50a and 50b are not limited to the above configuration.

B' Fυ Fire As explained above, according to the present invention, steps are formed on the upper and lower surfaces of the passage, and the inner opening of the passage is made narrower from the inside of the radiation source chamber to the outside. The outer opening of the radiation source chamber is communicated with the inner opening to make the radiation source room wider from the inside to the outside, while the inner door and the outer door are shaped to match the inner opening and the outer opening. There is no visible gap between the passage and the outer and inner doors, resulting in an effective radiation attenuation effect. In addition, the weight was reduced by dividing the conventional single radiation shielding door into two, and by supporting them cantilevered on hinges, there was no need to use a drive source such as a motor. You can quickly open and close the door manually. Therefore, there is no need to take measures against power outages, which were required in the past, and it also becomes possible to take immediate action as required by law.

Moreover, since it is manual, there is no need to worry about failure of a drive source such as a motor, as in the conventional case, and there is no need for electric power to be supplied to the drive source.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line A-A in FIG. FIG. 4 is an explanatory diagram showing another conventional opening/closing mechanism of a radiation source chamber. 10... Shielding wall, 10a... Radiation source room, 20...
- Passage, 21...Inner opening, 22...Outer opening, 30a...Inner door, 30b...Outer door, 40a,
40b...Hinge, 5Qa, 50b...'Lock mechanism.

Claims (1)

[Claims] (1) An inner opening that is provided in the shielding wall of the radiation source room and becomes narrower from the inside of the radiation source room to the outside; a passage consisting of an outer opening that becomes wider toward the inner side; and a passage that is cantilevered to the shielding wall by a hinge so as to match the inner opening and to be openable to the indoor side of the radiation source chamber. an inner door that matches the outer opening and is cantilevered to the shielding wall with a hinge so as to be openable to the outside of the radiation source room; and the inner door provides a passageway. a locking mechanism that can maintain or release the closed state of the passage with the inner door from inside and outside of the radiation source room when the passage is closed; An opening/closing mechanism for a radiation source chamber, comprising a locking mechanism that can maintain or release a state in which a passage is closed with an outer door.