JPH0345200Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a method for compressing radioactive solid waste such as used air filters contaminated with radioactivity to reduce its volume by compressing it for storage. Regarding machines.

[Prior art]

Air filters are often used in general industry, nuclear facilities, etc. to clean radioactive gases. These air filters are replaced at regular intervals, but used air filters trap dust containing uranium particles and radioactive particles and are contaminated with radioactivity. Strict processing methods such as , compression, and incineration are taken to reduce the volume (hereinafter referred to as volume reduction) for storage. In compressing the air filter for volume reduction, as shown in FIGS. 8 and 9, the air filter to be compressed is introduced into the primary press chamber 2 from the inlet 1 of the compressor, It is sent to the secondary press chamber 4 by the press cylinder 3,
At this time, it is simultaneously compressed to a width corresponding to the diameter of the cylinder that is the final compressed shape, and then sent to the tertiary press chamber 6 by the secondary press cylinder 5. At the same time, the molded plate attached to the secondary press cylinder 5 is 5a and the wall of the tertiary press chamber, the air filter is compression molded into a cylindrical shape, and then compressed into a cylindrical shape in the tertiary press chamber 6 by a tertiary press cylinder 7, and the compressed product in the tertiary press chamber 6 is compressed. The above operations are repeated until the amount reaches the predetermined amount. When the compressed material in the tertiary press chamber 6 reaches a predetermined amount, the opening/closing plate cylinder 8 is extended to open the bottom of the tertiary press chamber 6 through the hole 9a of the opening/closing plate 9, and the tertiary press is started. The compressed material in the tertiary press chamber 6 is fed by a tertiary press cylinder 7 into a storage container 10 set in advance in the lower part of the chamber 6.

However, the air filter 11 is
As shown in the figure, generally a filter media 12 made of glass fiber, a separator 13 made of aluminum, and a wooden frame 14 for fixing these are often used. In this case, the filter media 12 and separator 13 are aligned as shown in the figure. Therefore, filter media 1 punched from frame 14
2. After compressing the separator 13 from all directions in a free state without directionality, when this compression force is removed,
The filter media 12 expands in the directions of arrows A and B shown in FIGS. 6 and 7, and the separator 13 expands with elasticity in the directions of arrows C and D shown in FIG. 7, respectively. Therefore, in the case of the filter that is commonly used, in the conventional compression volume reduction means, the air filter 11 is charged through the input port 1 and compressed without considering the directionality, so that the filter media 12, the separator 13 are compressed into the final compressed cylindrical shape while the directions in which they are located are irregular. Next, several tens of minutes after the compression force is removed, the cylindrical compressed material has a length approximately 2.3 times the axial length of the compressed material at the time of compression due to the spring properties of the filter media 12 and separator 13. Since it expands in the axial direction, it has the disadvantage that sufficient volume reduction cannot be achieved.

[Problem that the invention attempts to solve]

The problem to be solved by this invention is to collect radioactive particles from radioactive waste contaminated with radioactivity, compress this radioactive waste, and even after releasing the compression, the radioactive waste is still sufficient. The point is to ensure that the volume is reduced.

[Means for solving problems]

In order to solve such problems, the present invention provides a transport mechanism for transporting radioactive waste, which includes a filter outer frame and a filter media installed inside the filter frame, and a transport mechanism that transports the radioactive waste. a vibration generating mechanism that applies vibration; a radioactive particle collection mechanism that is provided near the base end of the transport path of the transport mechanism and collects fallen objects from the radioactive waste vibrated by the vibration generating mechanism; a filter media punching mechanism that is provided near the terminal end of the transport mechanism, holds the radioactive waste carried in by the transport mechanism, and punches and removes the filter media from the filter outer frame;
A primary press mechanism is provided below the filter media punching mechanism and compresses the punched and input filter media from one direction, and the filter media compressed in this primary press mechanism is compressed by the primary press. a secondary press mechanism that compresses in the same plane as the compression direction of the mechanism and from a direction perpendicular to the compression direction; and a secondary press mechanism that compresses the filter media compressed in this secondary press mechanism in the compression direction of the primary and secondary press mechanisms. It is characterized by being equipped with a tertiary press mechanism that compresses from orthogonal directions.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7. Reference numeral 2 in Figures 1 and 2
Reference numeral 1 denotes a base, and this base 21 is provided with a recess 21a, and stands 22 and 23 are provided on the base 21. A tower 24 is erected on the stand 22. The column 24 includes a primary press chamber 25, a secondary press chamber 27 connected to the primary press chamber 25 through an opening 26, and an opening 2 connected to the secondary press chamber 27.
A tertiary press chamber 29 communicated by 8 is formed.

The primary press chamber 25 extends horizontally, and at one end thereof is a press chamber supported by a primary press cylinder 31.
A secondary press plate 31a is provided, the other end of which communicates with the secondary press chamber 27 through the opening 26.
It stops at the side wall of the next press chamber 27. The primary press plate 31a and the secondary press chamber 2
Filter media portion 11 to be treated with the side wall of 7
d is linearly compressed.

The secondary press chamber 27 extends within the same plane and perpendicularly to the compression direction of the primary press chamber 25, and has a secondary forming plate 32 formed with a semi-circular concave surface at one end thereof.
a is supported by the secondary press cylinder 32, and a semicircular concave wall surface is similarly formed on the other end side. Then, the filter media portion 11d, which was previously compressed in the primary press chamber 25, is secondarily compressed into a substantially cylindrical shape by the secondary forming plate 32a and this wall surface.

The tertiary press chamber 29 is provided vertically below one end of the secondary press chamber 27 and includes a wall surface connected to a wall surface of a semicircular concave surface formed on the other end side of the secondary press chamber 27. The upper end communicates with the secondary press chamber 27 through an opening 28, and the lower end is an open chamber with a circular cross section. Above the tertiary press room 29,
A tertiary press cylinder 33 is vertically provided above one end of the secondary press chamber 27 and has a tertiary press plate 33a at its tip. 3
The secondary press plate 33a passes through one end side of the secondary press chamber 27 and is vertically slidable in the tertiary press chamber 29. Further, an opening/closing plate 34 is provided in the middle part of the tertiary press chamber 29 so as to move through the tertiary press chamber 29 from side to side in FIG. This opening/closing plate 3
4 is connected to an opening/closing plate operating cylinder 35 horizontally fixed to the side wall of the tower 24. The tertiary press plate 33a and the opening/closing plate 34 form the secondary press chamber 2.
The filter media portion 11d compressed in step 7 is tertiary compressed into a cylindrical shape. A circular hole 34a through which the tertiary press plate 33a can pass is formed on the side of the opening/closing plate actuating cylinder 35 of the opening/closing plate 34. Tertiary press room 29
Below is a waste storage container 3 carried into the lower part of the stand 22 placed on the trolley 36 in the recess 21a.
7 is set.

On the other hand, a transport mechanism 38 is provided on the table 23 so as to be movable in the left-right direction in FIG. This conveyance mechanism 38 includes a conveyance cylinder 39 fixed on the table 23 in the left-right direction in FIG.
, an L-shaped frame 40 connected to this transport cylinder 39 and running on the table 23 , a vertical drive mechanism 41 provided on this L-shaped frame 40 , and an L-shaped frame 4 connected to this vertical drive mechanism 41 .
It consists of a grip part 42 that moves up and down along the vertical frame 40a of 0. The vertical drive mechanism 41 is provided with a vertical movement cylinder 43 attached to the vertical frame 40a and an upper part of the vertical frame 40a,
It consists of a vertically moving cylinder 43 and a generally well-known pulley mechanism 44 that is connected to the gripping part 42 and gradually moves the gripping part 42 up and down by the operation of the vertically moving cylinder 43. The grip part 42 is a U-shaped frame 4
5, a receiver 46 provided at the tip of this U-shaped frame 45, and a gripping cylinder 48 having a gripper 47 at the tip. Receiver 46, gripper 47
An air filter 11 is held between them.

Further, the U-shaped frame 45 is provided with a vibration generating mechanism 49. This vibration mechanism 49 is a U-shaped frame 4
An arm member 51 has a shaft 50 rotatably attached to the shaft 50 parallel to the axial direction of the gripping cylinder 48, and three arms fixed to the shaft 50 and projecting radially from the shaft 50. It consists of a beating roller 52 rotatably attached to each tip, and when the arm member 51 rotates together with the shaft 50, the beating roller 52 intermittently hits the side surface of the frame 14 of the air filter main body 11a held by the gripping part 42. It abuts and passes, vibrating the main body 11a of the air filter. Note that the shaft 50 is driven by pulleys 54 and 5 by a motor 53.
5. It is designed to be rotated via a belt 56.

In addition, above the primary press chamber 25 on the gripping part 42 side of the upper part of the tower 24, a main body 11 of the filter 11 is provided.
A punching mechanism 57 for punching out the filter media portion 11d from a is provided. This punching mechanism 57
A bracket 58 is provided on the punching table 57a and the top of the tower 24, a punching cylinder 59 is vertically attached to the bracket 58, and a guide rod 6 is passed through the bracket 58 in the vertical direction.
0a and a punching plate 60 horizontally attached to the lower end of the punching cylinder 59. A hole (not shown) is formed in the punching table 57a and has approximately the same size as the inner diameter of the frame 14 and communicates vertically with the primary press chamber 25. Punching mechanism 57
A positioning mechanism 61 for the air filter 11 is provided on the top of the
is provided. This positioning mechanism 61 includes a box-shaped cover 61a that is slidably fitted to a guide rod 60a and fitted to a piston rod of a punching cylinder 59 and a punching plate 60 so as to be vertically movable.
The spring 62 has one end attached to the upper surface of the cover 61a and the other end attached to the lower surface of the bracket 58 to bias the cover 61a downward. The punched plate 60 is a square plate whose size is very slightly smaller than the inner diameter of the frame 14.

Further, as shown in FIG. 4, the transport mechanism 38
A radioactive particle recovery chute 63 is provided adjacent to the tower 24 near the base end of the transport path. Below this collection chute 63 is a collection container 6.
4 is fixed to the table 22 by a fixing cylinder 65 so as to be movable up and down.

The cylinders, motors, etc. are connected to an appropriate control device (not shown) and are automatically operated according to predetermined operations. Further, these can also be operated manually.

Next, the operation of the radioactive waste compressor configured as described above will be explained.

When reducing the volume of air filter 11 contaminated with radioactivity, as shown in FIG.
1c is cut and separated, and then the main body 11a is placed on a conveyor (not shown) in a predetermined direction, and the receiver 46 of the gripping part 42 in FIGS. 2 to 4 is held. 47, and actuates the gripping cylinder 48 so that the main body 11a is oriented in a predetermined direction by the receiver 46 and the gripper 47, that is, in the arrangement direction in which the separators 13 of the air filter 11 are arranged at intervals. (in the direction of arrows A and B in FIGS. 6 and 7) is the primary press cylinder 31,
It is gripped in the same direction as the axial direction of the gripping cylinder 48.

Next, the conveyance cylinder 39, the vertical movement cylinder 43, and the pulley mechanism 44 are operated to position the main body 11a on the recovery chute 63 as shown in FIG.

On the other hand, the waste storage container 37 is placed on the cart 36 and carried below the stand 22, and the waste storage container 37 is set in the lower part of the tertiary press chamber 29.

Next, the motor 53 is driven. Then, the arm 51 rotates together with the shaft 50, and each striking roller 52 intermittently contacts and passes the frame of the main body 11a.
vibrate a. As a result, the main body 11a (frame,
The radioactive particles adhering to the filter media 12 and separator 13) are collected into a collection container 64 via a collection chute 63.

Next, the conveying mechanism 38 is activated to transport the main body 11a onto the punching table 57a, the gripping part 42 releases the air filter 11, and the cover 61 is placed over the main body 11a. As a result, the punching table 5
Main body 11a is positioned at a predetermined position on 7a. Here, the punching cylinder 59 is operated to extend downward. Then, with the frame 14 of the main body 11a in contact with the upper edge of the punching table 57a, the punching plate 60 punches out the filter media portion (filter media 12, separator 13) 11d from the frame 14, and the filter media portion 11d is in the primary press chamber. 25 and is pre-compressed by a punching plate 60. At this time, the arrangement direction of the separators 13 (directions of arrows A and B in FIGS. 6 and 7) is directed toward the axial direction of the primary press cylinder 31. Note that the frame 14 is gripped again by the transport mechanism 38 and carried out, and then incinerated in a separate process.

Next, the primary press cylinder 31 is operated to extend. Then, the filter media portion 11d is sent to the secondary press chamber 27, and the filter media portion 11d is compressed between the side wall of the secondary press chamber 27 and the primary press plate 31a, and is compressed to a diameter corresponding to the diameter of the cylinder in the final compressed shape. It is set to a predetermined width.

Next, the secondary press cylinder 32 is operated to extend. Then, the filter media portion 11d in the secondary press chamber 27 is sent to the other end of the secondary press chamber 27, that is, above the tertiary press chamber 29, and the semicircular arc at the other end of the secondary press chamber 27 It is compressed between the concave surface and the semicircular concave surface of the secondary forming plate 32a to form a columnar shape.

Next, the tertiary press cylinder 33 is moved to extend with the opening/closing plate 34 blocking the middle portion of the tertiary press chamber 29 . Then, the filter media portion 11d above the tertiary press chamber 29 is compressed on the opening/closing plate 34 by the tertiary press plate 33a.

Next, the above-described series of operations is repeated until the air filter 11 is put into the compressor and subjected to tertiary compression in the tertiary press chamber 29, and a plurality of compressed and loaded filter media sections 1 are
1d, .
5 is extended. Then, the tertiary press room 29
The middle part of is in the open state, and by further extending the tertiary press cylinder 33 downward,
The compressed and reduced volume filter media portion 11d in the tertiary press chamber 29 is accommodated in the waste storage container 37. The above operations are automatically performed by the control device, but they can also be performed manually.

According to this embodiment, radioactive particles can be automatically collected from the air filter 11 contaminated with radioactivity, and the filter media portion 11d is not compressed without considering the directionality, but is compressed first. After pre-compression in the punching process, the separator 13
The volume is compressed in the direction in which the filters are arranged, then the volume is compressed in the direction perpendicular to this direction, and then the volume is compressed in the vertical direction. The expansion rate of the separator 13 and filter media 12 after removal becomes small, and the volume can be sufficiently reduced. In this regard, Figure 8,
Compared to the volume reduction rate of the filter media section 11d due to the compression of the filter media section 11d using the conventional compressor shown in FIG. 9 without limiting the compression direction,
It has been confirmed that the volume reduction rate of the filter media section 11d due to compression of the filter media section 11d using the compressor of this embodiment is approximately 20% larger. Incidentally, to add about the volume reduction rate due to compression of the filter media section in this case, the volume reduction rate of the filter media section = V ₁ - V ₂ /V ₁ × 100 However, V ₁ = Volume of the filter media section 11d before compression ( m ³ ) V ₂ = volume (m ³ ) of the filter media portion 11d after compression.

In the above embodiment, an example was explained in which this invention was applied to compressing and reducing the volume of the filter media portion 11d, but it is not limited to this, and the invention may also be applied to compressing and reducing the volume of other radioactive solid wastes. can. In this case, radioactive waste other than the air filter is fed into the secondary press 27 along the inclined plate 30a by a feeding chute 30 provided above the side wall of the secondary press chamber 27 at a position facing the primary press chamber 25. It is then subjected to the same compression process as above to reduce its volume and recover it.

Further, in the embodiment, the air filter 1
Although the air filter 11 is vibrated by intermittently bringing the striking roller 52 into contact with the drum 1, the air filter 11 is not limited to this, and the air filter 11 may be vibrated by other vibration excitation means.

〔effect〕

Radioactive particles are separated and recovered from radioactive waste,
Furthermore, due to the plastic deformation caused by the radioactive waste being compressed in a regular direction, the volume remains sufficiently reduced even after the compression is released.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of the radioactive waste compressor of the present invention, and Figure 1 is a plan view;
Figure 2 is a front view, Figure 3 is a side view, Figure 4 is a front view of main parts, Figure 5 is an exploded perspective view of the air filter, Figure 6 is a cross-sectional plan view of the air filter, and Figure 7 is a longitudinal cross-section of the air filter. A front view, FIG. 8 is a longitudinal sectional front view of a conventional radioactive waste compressor, and FIG. 9 is a side sectional view of the conventional radioactive waste compressor. 11... Air filter (obsessive waste), 25
...Primary press room, 27...Second press room, 29
...Third press chamber, 31...Cylinder for primary press, 31a...Primary press plate, 32...Cylinder for secondary press, 32a...Secondary forming plate, 33...
Tertiary press cylinder, 33a... Tertiary press plate, 34... Opening/closing plate, 35... Opening/closing plate operating cylinder, 38... Transport mechanism, 42... Gripping section, 57...
...Punching mechanism, 63... Collection chute, 64...
Collection container.

Claims (1)

[Claims for Utility Model Registration] A conveying mechanism for conveying radioactive waste, which includes a filter outer frame and a filter media installed inside the filter frame, and an actuator provided in the conveying mechanism that vibrates the radioactive waste. a vibration mechanism; a radioactive particle collection mechanism that is provided near the base end of the transport path of the transport mechanism and collects fallen objects from the radioactive waste vibrated by the vibration generating mechanism; a filter media punching mechanism provided near the terminal end to hold the radioactive waste carried in by the transport mechanism and punch out the filter media from the filter outer frame; a primary press mechanism that compresses the punched and input filter media from one direction; and a primary press mechanism that compresses the filter media compressed in this primary press mechanism in the same plane as the compression direction of the primary press mechanism. and a secondary press mechanism that compresses from a direction perpendicular to the direction, and a tertiary press mechanism that compresses the filter media compressed in the secondary press mechanism from a direction perpendicular to the compression directions of the primary and secondary press mechanisms. A radioactive waste compactor comprising a press mechanism.