JPH058558Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to a radiation shielding gate device installed at a port for taking in and out radioactive materials from the ceiling into a radiation shielding room such as a cable.

Conventional technology Conventionally, in a cave (radiation shielding room) handling highly radioactive materials such as a hot laboratory facility, for example, as shown in FIGS. 11 to 13, the cave 61 is
A port 63 is formed in the ceiling 62 of the ceiling 3, and the port 63 is housed in a frame 64 on the outer surface of the ceiling 3.
Gate device 6 having a gate body 65 that opens and closes
6 was provided, and when closed, it shielded radiation from the port 61, and when opened, radioactive materials were taken in and taken out.

Problems to be Solved by the Invention However, since devices such as glove boxes and casks are installed on the outer surface of the ceiling 62 of the cable 61, the gate device 65 is limited to the outer surface of the ceiling 62 of the cable 61. It occupies a relatively wide area of the floor surface, and the working surface on the outer surface of the ceiling 62 of the cable 61 is narrow and cramped, which poses a problem in terms of workability. In addition, when repairing the gate device 66,
It is necessary to carry out work to prevent radioactive contamination of the outer surface of the ceiling 62 of the cable 61 as a result of this work, which poses the problem of being a large-scale work.

Means for Solving the Problems In order to solve the above problems, the present invention provides a radiation shielding gate device installed at a port for taking radioactive materials in and out of the radiation shielding room from the ceiling. Inside the ceiling, there is a gate body that can open and close the port and shields radiation.
A gate support device for supporting the gate body is provided, and a gate opening/closing device for opening and closing the gate body in conjunction with the gate body is provided on the outside of the ceiling of the radiation shielding room.

Function In the above configuration, when radioactive materials are to be taken in and out, the gate body on the inside of the ceiling can be opened using the gate opening/closing device on the outside of the ceiling of the radiation shielding room, and this can be done from the port on the ceiling. There is no gate body or gate support device, and the outer surface of the ceiling of the cable can be used effectively and widely.

Embodiment An embodiment of the present invention will be described below based on the drawings.

In Figures 1 to 3, a gate consisting of a pair of left and right main shields 4A and 4B that can move relatively to open and close the port 1 and shield radiation is located inside the ceiling 3 of the cable 2 in which the port 1 is formed. It has a main body 5 and a gate support device 6 that movably supports the gate main body 5, is arranged on the outside of the ceiling 3, and opens and closes the main shields 4A and 4B in conjunction with the gate main body 5. It has a gate opening/closing device 7.

The details will be explained below.

The gate main body 5 is attached to the lower side of the cylindrical port 1, and the left and right main shields 4 are thick plate-shaped and have a valley-shaped cross section and a mountain-shaped cross section that can be fitted with opposing surfaces.
A and 4B are arranged to be able to close the opening surface of the port 1.

A gate support device 6 that supports the left and right main shields 4A, 4B is located on the lower surface of a frame-shaped auxiliary shield 8 disposed around the main shields 4A, 4B, and has a port 1 at the center thereof. A support base 9 having an axial and identical opening 9a is attached, and the four corners of the lower surfaces of the main shields 4A, 4B are placed on a pair of rails 10 arranged in the left-right direction at front and rear positions on the support base 9. It movably supports wheels 11A and 11B respectively disposed on.

This gate support device 6 is provided with a drive section 13 that is connected and interlocked with the gate opening/closing device 7 via a connection section 12 and opens and closes the main shields 4A and 4B. This drive unit 13 is attached to an opening/closing screw shaft 15 rotatably mounted on one side of the main shields 4A, 4B on the support base 9 in parallel with the rail 10 via a bearing 14, on the left side from the middle part and A symmetrical male threaded portion 15a is formed on the right side, and female threaded portions 16A, 16B protruding from one side of the main shields 4A, 4B are screwed into this male threaded portion 15a, and this opening/closing screw shaft By rotating the main shields 4A and 4B, the main shields 4A and 4B are moved closer to each other and separated from each other.
can be opened and closed.

As shown in FIG. 4, the gate opening/closing device 7 has a drive shaft 19 rotated by an operation handle 18 in the operation box 17, and a driven shaft 20 connected to the connecting portion 12, which are connected to a drive gear 19a and a driven gear 20a. An electromagnetic clutch 21 is provided between the driven gear 20a and the driven shaft 20.
is interposed. Moreover, this driven shaft 20 is
The measuring gear 20b fixed at 0 meshes with the measuring gear 22a of the measuring screw shaft 22 and moves in conjunction with the measuring screw shaft 22, and the rotation of the measuring screw shaft 22 causes the screw of the measuring screw shaft 22 to rotate. The indicator 24 is moved along the guide bar 23 between the stoppers 22C that limit the opening and closing movement of the main shields 4A, 4B provided at both ends of the section 22b, and the main shields 4A, 4B are closed.
Displays the open/closed status.

The driven shaft 20 and the screw shaft 1 for opening and closing the drive section 13
The connecting portion 12 that connects the cable 2 has upper and lower gear boxes 25A and 25B at the upper and lower ends thereof, and a through plug 26 that has a built-in vertical shaft 26a that interlocks the gears in each gear box 25A and 25B is connected to the cable 2.
It is installed through the ceiling 3 of. The rotating shaft 27 of the upper gearbox 25A is connected to the driven shaft 20 of the gate opening/closing device 7, and the rotating shaft 28 of the lower gearbox 25B penetrates the auxiliary shield 8 via the universal joint 29 and the intermediate shaft 30. By rotating the operation handle 18 of the gate opening/closing device 7, the gate can be opened/closed via the gears in the gearboxes 25A, 25B of the connecting portion 12, the vertical shaft 26a of the through plug 26, etc. Rotate the screw shaft 15 for main shields 4A, 4
B can be opened and closed.

The upper end of the port 1 is formed to protrude upward from the outer surface of the ceiling 3, and an airtight bag 31 such as a vinyl bag is attached to cover the opening of the port 1. A possible cover plate 32 is attached to maintain double airtightness together with the airtight bag 31.

By the way, on the outer surface of the ceiling 3 near the port 1, an interlock device 33 is disposed to release the closing lock of the gate device when carrying in or out of the port 1 radioactive materials. In other words, the cask 3 shown in Figures 5 to 7 is used to transport radioactive materials.
4 is used to place the opening of the cask 34 in communication with the port 1 via the cask connecting seat 35 arranged around the upper part of the port 1. At this time, the cask 3
4 is a lifting rod 35 provided on the cask mounting seat 35
By pushing the limit switch 33a of the interlock device 33 via
and a driven shaft 20, so that the gate body 5 can be opened using the operating handle 18.

Next, the effect will be explained.

For example, when transporting an object 36 containing radioactive materials into the cave 2, as shown in FIGS. 5 to 7, the cover plate 32 is first removed, and
The cask 34 containing the cask mounting seat 35 and the transported object 36 is set at a predetermined position above the cell 1 by a crane (not shown) in the building. Then,
Interlock device 33 is released. next,
The conveyed object 36 in the cask 34 is suspended from a hanging rope 37a of a lifting device 37 attached to the cask 34 via an attachment/detachment device 38. Then, at the same time as opening the door of the cask 34, the main shields 4A and 4B are opened using the operation handle 18, and the transported object 36 is suspended.
It is suspended from the floor of the cable 2 through the port 1 and the opening 9a of the support base 9. Note that at this time, the airtight bag 31 of the port 1 is extended downward together with the transported object 36. Then, as shown in FIG. 7, after removing the attaching/detaching device 38 from the conveyed object 36 and lifting the attaching/detaching device 38, the airtight bag 31 is melted and sealed at the intermediate portion and cut (melt-sealed and cut). Note that the sealing and cutting device is not shown. Furthermore, the lifting device 37 pulls up the attaching/detaching device 38 to pull up the remaining airtight bag 31a hanging down from the port 1, and closes the main shields 4A, 4B. Then, the cask 34 and the cask joint seat 35 are removed by a crane, the airtight bag 31a is replaced, and the cover plate 32 is attached.

In the above embodiment, the airtight bag 31 and the cover plate 32 are provided at the upper end of the port 1 to improve airtightness, but as shown in FIG. The body 41 may be inserted. In these structures, the insertion and removal of the sub-shielding body 41 and the attachment and detachment of the cask joint seat can also be performed by remote control. In this figure 8,
The main shielding bodies 42A and 42B are made large, and the auxiliary shielding body is omitted.

9 and 10 show still another embodiment, in which the gate body 51 is integrated, and the ceiling 5
The running wheels 54 of the gate main body 51 are guided and supported by the rails 53 on both sides attached to the inside of the gate 2, and are opened and closed by an opening/closing screw shaft 55 inserted into one end of the gate main body 51 parallel to the rails 53. Ru. Note that this opening/closing screw shaft 55 is connected to the port 5.
6 Located at a position away from the opening surface. According to this embodiment, since the gate body is made large, other auxiliary shielding bodies and the like are not required.

In addition to the above-mentioned embodiment, the present invention can also be applied by opening and closing the port by rotating the gate body disposed inside the ceiling of the cable center around a rotating shaft provided parallel to the central axis of the port. A similar effect can be obtained.

Effects of the invention As described above, according to the invention, since the gate device other than the gate opening/closing device is placed inside the ceiling of the radiation shielding room such as a cave, the space outside the ceiling of the radiation shielding room is expanded and is effective. It can be used to improve workability. Furthermore, when repairing the gate device, there is no need to decontaminate the gate device because the outer surface of the ceiling of the cave will not be contaminated with radioactivity.

[Brief explanation of the drawing]

Figures 1 to 7 show an embodiment of the present invention, with Figure 1 being a front sectional view showing the gate device, Figure 2 being a bottom view, Figure 3 being a side sectional view, and Figure 4 being the opening/closing device. 5 to 7 are sectional views each illustrating the operation, FIG. 8 is a front sectional view showing another embodiment, and FIGS. 9 and 10 are further sectional views showing other embodiments. FIGS. 11 to 13 are an overall front view, an overall side view, and a front sectional view of a gate device, respectively, showing a conventional example. 1... Port, 2... Cable, 3... Ceiling, 4
A, 4B...Main shield, 5...Gate body, 6...
...Gate support device, 7...Gate opening/closing device, 8...
... Auxiliary shield, 9 ... Support base, 10 ... Rail, 12 ... Connection section, 13 ... Drive section, 15 ...
Opening/closing screw shaft, 16A, 16B...Female thread part.

Claims (1)

[Scope of utility model registration request] A radiation shielding gate device installed at a port for taking radioactive materials in and out of a radiation shielding room from the ceiling, which includes a gate body that can open and close the port and shields radiation, and a gate body that is installed on the inside of the ceiling of the radiation shielding room to shield radiation. A gate support device for supporting a gate body, and a gate opening/closing device for opening and closing the gate body in conjunction with the gate body is provided on the outside of the ceiling of the radiation shielding room. .