JPH0120720Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drum for storing stored materials, and is particularly suitable for use in storing radioactive waste.

When storing radioactive waste contaminated by radioactivity, such radioactive waste is generally stored tightly in a drum made of stainless steel or the like.
This drum is stored in a storage warehouse and disposed of as needed.

As the storage, one having the structure shown in FIGS. 1 and 2 is used. That is, it is composed of guide columns 2 installed vertically on the floor at predetermined intervals so as to surround the drum 1, and reinforcing members 3 that interconnect adjacent guide columns 2, and the interior and exterior of the storage are It is shut off by plug 4. Drum 1 to this storage
To store the drums, the plugs 4 are removed and the drums 1 are dropped and stacked as shown in Figure 2.

Conventionally, a drum having a structure shown in FIGS. 3 and 4 is used. A disc-shaped lid 5 and a cross-shaped arm 6 are connected by a bolt 7 so as to be relatively movable in the vertical direction in FIG. 4, and by tightening the bolt 8, the lid 5 is pressed downward. At the same time, the arm 6 is pushed upward as a reaction.
The arm 6 and the lid 5 push each other in this way.
The lid 5 is fixed by hitting the upper stopper 9 and the lower stopper 10, respectively. This lid 5 and lower stopper 10
An O-ring 11 is provided between the drum body 12 and the inside of the drum body 12 to be sealed. This drum body 1
A manipulator device is used to store the radioactive waste in the chamber 2 because it cannot be carried out manually due to the generation of harmful gases. Note that 13 is a hanging tool.

However, in order to store the waste inside the drum, the bolts had to be turned using an impact wrench, etc.
Performing this operation using a manipulator device is time consuming and difficult to operate. In addition, since an O-ring is provided between the lid and the lower stopper that are lined up in the direction in which the lid moves, if an impact force is applied to the drum and the bolt loosens or the bolt thread breaks, the lid and lower stopper will There will be a gap between them, making it impossible to maintain airtightness inside the drum. This can also occur when a wire or the like is hung on a hanging tool.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate such drawbacks and to provide a drum that has excellent airtightness and is easy to store waste materials. The structure of the present invention to achieve such an object includes a cylindrical drum body with an open end, a lower stopper formed over the entire inner circumference of the opening of the drum body, and an opening of the lower stopper. A plurality of upper stoppers are formed at approximately equal intervals on the inner circumferential surface of the drum body opening on the end side and have an inner diameter larger than the inner diameter of the lower stopper, and a first cutout is provided on the outer periphery of the portion corresponding to the upper stopper. A lid is formed and fitted to the inner circumferential surface of the lower stopper via a sealing material, and a second notch is formed on the outer periphery of a portion corresponding to the upper stopper, and a second notch is formed on the outer periphery of a portion corresponding to the upper stopper, and a circumference is formed between the upper stopper and the lid. The drum body includes a fixed plate that is rotatable in the direction and engaged with the lid and the upper stopper when rotated in the circumferential direction, and a valve that communicates between the inside and the outside of the drum body. It is characterized by

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

Examples are shown in FIGS. 5 and 6. A lower stopper 15 is formed on the inner peripheral surface of the opening of the cylindrical drum body 14 over the entire circumference.
An upper stopper 16 is formed at a predetermined distance from the lower stopper 15 on the opening side. Upper stopper 16
are provided at four locations on the inner peripheral surface of the drum body 14 in this embodiment at approximately equal intervals, and the inner diameter of the upper stopper 16 is larger than the inner diameter of the lower stopper 15. A lid 17 is placed between the lower stopper 15 and the upper stopper 16. The lid 17 has a disc shape, and passes through the upper stopper 16.
First notches 17a are formed at four locations on the outer periphery corresponding to the upper stopper 16 so as to be fitted between the upper stopper 16 and the lower stopper 15. Further, a ring material 18 that fits inside the lower stopper 15 is attached to the lower part of the outer circumference of the lid 17 by welding or the like, and an O-ring 19 is provided as a sealing material on the outer circumferential surface that comes into contact with the inner circumferential surface of the lower stopper 15. It will be done. . This lid 1
A U-shaped handle 20 is attached to the upper part of the lid 7, and a rib 21 for reinforcing the lid 17 is welded to the lower part. A fixing plate 22 is provided between the lid 17 and the upper stopper 16 to prevent the lid 17 from coming off the drum body 14. Upper stopper 1
6 and the lower stopper 15 is a distance that is slightly larger than the sum of the thicknesses of the fixing plate 22 and the lid 17. The fixing plate 22 has a donut shape with a hollowed out center, and has an upper part so that it can pass through the upper stopper 16 like the lid 17 and be fitted between the lid 17 and the upper stopper 16 that were previously fitted. Second notches 2 are provided at four locations on the outer periphery corresponding to the stoppers 16.
2a is formed, and the fixed plate 22 is rotatable around the same central axis as the lid 17. This fixed plate 2
2 is fitted between the lid 17 and the upper stopper 16, eight guide bolts 23 which act as guides to prevent the fixing plate 22 from being rotated and removed are in contact with the inside of the fixing plate 22 and spaced at equal intervals. It is fixed to the lid 17 by welding. A nut 24 is screwed into this guide bolt 23 as shown in an enlarged view in FIG.
7 and the fixing plate 22 are handled as one unit. Furthermore, rotation prevention stoppers 25 are provided between the upper stopper 16 and the lower stopper 15 at both ends of the upper stopper 16 so that the lid 17 does not rotate together when the fixed plate 22 is rotated. Then, in order to lock the fixed plate 22 to the lid 17 after rotating the rotary plate 22,
A locking pin 26 is provided on the fixing plate 22. As shown in an enlarged view in FIG. 8, the locking pin 26 has a structure in which a pin body 29 is screwed into a fixing plate 22 and has a steel ball 28 inside which is biased by a spring 27. 28 is fitted into a recess 30 formed in the lid 17 and locked. In addition, 3
1 is a rotation prevention pin that prevents the fixed plate 22 from rotating beyond a certain angle.

Generally, drums that store radioactive waste are handled remotely using a manipulator, etc., so the rotary pin 3
1, the lid 17 is closed at the position where the rotating plate 22 comes into contact with the rotation prevention pin 31 and stops moving.
It can be visually confirmed that it is securely fixed. Therefore, the position of the anti-rotation pin 31 is similar to that of the locking pin 2.
This is the position where the steel ball 28 of No. 6 fits into the recess 30, and the position where the fixing plate 22 and the lid 17 are sandwiched between the upper stopper 16 and the lower stopper 17, as shown in FIG. In the case of this embodiment, the first notch 17a of the lid 17 and the second notch 22a of the fixing plate 22 are offset by approximately half.

As can be seen from the structure of this drum, when the lid 17 is placed over the drum body 14, the gas inside the drum body 14 is compressed.
In this embodiment, the lid 17 may be provided on the top of the lid 17.
A purge valve 32 is provided to communicate the inside and outside of the drum body 14. The purge valve 32 can be opened and closed by turning a handle 33 as shown in FIG.

On the other hand, as described above, the drums are stacked in the storage, but when stacking, the plugs 4 are removed and dropped. Therefore, there is a problem in that an impact force is applied to the drum, deforming the drum body or the lid, and deteriorating the sealing performance. In this embodiment, the following measures are taken to prevent such impact force from being directly applied to the drum body, etc. Drum body 14
Eight buffer pipes 34 are attached to the bottom of the housing and the fixing plate 22 at approximately equal intervals by welding or the like. This pipe material 34 is made of a soft material such as aluminum in order to absorb impact force by collapsing itself. Then, a ring plate 35 is welded to connect the pipe materials 34 so that the impact force is applied to these pipe materials 34 as evenly as possible.

To store radioactive waste in such a drum,
After placing the radioactive waste into the drum body 14, the following steps are performed. The upper stopper 16 and the lower stopper are aligned by aligning the first cutout 17a and the second cutout 22a of the lid 17 and the fixed plate 22, which are integrally and rotatably connected to each other by the guide bolt 23 and nut 24. Insert it between 15 and 15. At this time, the ring material 18 provided with the O-ring 19 on the inner peripheral surface of the lower stopper 15
Since the outer peripheral surface of the plug 14 slides and the lid 17 is pushed in, and the lid 17 and the lower stopper 15 engage, the gas inside the plug 14 is compressed.
Turn to open the purge valve 32. Then, turn the fixing plate 22 to the left in FIG. At this time, the lid 17 is prevented from rotating together by the rotation prevention stopper 25. When the fixing plate 22 is turned by the angle θ as shown in FIG. 5, the steel ball 28 of the locking pin 26
is fitted into the recess 30 and the fixing plate 22 is attached to the lid 17.
At the same time as the lid is locked, the fixing plate 22 engages with the upper stopper 16, and the fixing plate 22 and the lid 17 are sandwiched between the upper stopper 16 and the lower stopper 15 and fixed. Finally, when the handle 33 is turned to close the purge valve 32, the inside of the drum is completely sealed. In this drum, even if the lid 17 moves up and down in FIG. 6, there is no gap between the lower stopper 15 and the ring material 18, and therefore there is little possibility that the gas inside the drum will leak.

In order to store the drum containing radioactive waste in this way, it is dropped into the above-mentioned storage, but in this embodiment, the bottom of the drum body 14 and the fixing plate 22 are provided with a buffer pipe material 34. Therefore, damage to the drum itself is prevented, and by changing the way of thinking, the wall thickness of the drum body 14, etc. can be made thinner, and therefore the drum can be manufactured lighter and at a lower cost.

As described above with reference to the embodiments and drawings, the present invention has the following effects. To fix the lid, just turn the fixing plate, so you can easily fix the lid even with a manipulator device.Furthermore, since the lid is held in place with the fixing plate by the upper and lower stoppers, even if an impact force is applied to the drum, the lid will remain in place. There is little chance of it coming off. In addition, since a sealing material is provided on the outer circumferential surface of the lid that comes into contact with the inner circumferential surface of the lower stopper,
Even if the lid moves slightly in the vertical direction, the sealing performance of the drum will not be impaired.

[Brief explanation of the drawing]

Fig. 2 is a vertical sectional view of the storage, Fig. 1 is a sectional view taken along the line A-A in Fig. 2, Figs. 3 and 4 relate to a conventional drum, Fig. 3 is a plan view, and Fig. 4 is B in Figure 3.
5 to 9 relate to the drum according to the present invention, FIG. 5 is a plan view, FIG. 6 is a longitudinal sectional view, and FIGS. 7, 8, and 9 are respectively C in Figure 6,
It is an enlarged sectional view of D and E. In the drawings, 14...Drum body, 15...Lower stopper, 16...Upper stopper, 17...Lid, 18
... Ring material, 19 ... O-ring, 21 ... Rib, 22 ... Fixing plate, 32 ... Purge valve.

Claims (1)

[Scope of utility model registration request] a cylindrical drum body with one end open; a lower stopper formed all around the inner circumferential surface of the opening of the drum body; and an inner circumferential surface of the drum body opening on the open end side of the lower stopper. A plurality of upper stoppers are formed at approximately equal intervals and have an inner diameter larger than the inner diameter of the lower stopper, and a first cutout is formed on the outer periphery of a portion corresponding to the upper stopper, and the inner part of the lower stopper is formed through a sealing material. A second notch is formed on the outer periphery of a portion corresponding to the lid that is fitted onto the peripheral surface and the upper stopper, and the lid is rotatably provided in the circumferential direction between the upper stopper and the lid. A drum comprising: a fixed plate that engages between the lid and the upper stopper when moved; and a valve that communicates between the inside and outside of the drum body.