JPS6314920B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for reducing the volume of a used frame filter.

A conventional frame filter 1 (Fig. 1) used in nuclear power plants, etc. is made of a rectangular frame 2 and a high-extent material 3 made of paper, etc., but its overperformance is reduced. The frame filter 1 that is no longer usable is reduced in volume using a compression device, and is then discarded or stored. A commonly used compression method involves folding and forming a frame 2 inside a frame filter 1, as shown in FIG.

However, the amount of material 3 is much larger than that of frame 2,
Material 3 becomes hard when compressed, its thickness does not decrease beyond a certain limit, and the volume when material 3 is compressed and becomes dense as shown in FIG. 2 is constant, so the volume shown in FIG. In this method, a void is created in the folded part of the frame 2 and the occupied volume of the material 3 is reduced, so the volume corresponding to the void becomes a loss and the volume reduction rate in the thickness direction of the frame filter 1 is reduced. I'm letting you do it. Furthermore, when the compressive force is removed, the volume tends to increase due to the restoration (Fig. 3B).

Generally, when compressing and reducing the volume of a frame filter, it is important to improve the volume reduction efficiency, but the present invention secures the occupied volume of the material by devising the compressed shape and compression method, and achieves high volume reduction. This is a method for reducing the volume of a frame filter consisting of an outer peripheral frame member made of a hard material that can be plastically deformed and a filter material installed inside the frame member. The filter material of the framework filter is compressed by the end face of a cylindrical tool, and while the tool is held in the compressed state, the frame member is pressed from the outside against the side surface of the tool to form an annular shape, and then the tool is compressed. is removed, and the ring-shaped frame member is further press-formed in a direction perpendicular to the compression direction of the tool, and then compressed again with the tool in the compression direction of the tool to form the whole into a disk shape. It is an object of the present invention to provide a method for reducing the volume of a used framework filter.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows an assembly structure of a forming jig used for compression processing of a frame filter showing an embodiment of the present invention.
Now, the structure of the jig is as follows: annular forming jigs 6a, 6b
3 parts of the frame filter 1 and a cylindrical vertical compression jig 4 used for compression during final molding, arranged perpendicularly to the center of the cylindrical frame formed by the
The ears of the frame 2 are deformed from the sides of the frame filter 1 using the vertical compression jig 4, which has previously compressed the 3 parts of the frame filter 1, as a guide, and the frame 2 is preformed into an annular shape. A preforming jig 5, annular forming jigs 6a and 6b, which form the frame 2 of the preformed frame filter 1 into an annular shape and serve as supporting metal fittings during final compression molding with the vertical compression jig 4, and each jig are used. It is composed of guide plates 7, 8a, and 8b for supporting the tools and determining the direction of movement.

Next, to explain the operation, the restoration suppression compression method according to the method of the present invention will be explained with reference to FIG. First, as shown in A, the frame filter 1 is installed at a predetermined position directly below the vertical compression jig 4.

Next, the vertical compression jig 4 is lowered as shown in (b) to compress three parts of the material of the frame filter 1. This makes the material 3 dense and firm.

Further, as shown in C, the preforming jig 5 is advanced while the material 3 is compressed by the vertical compression jig 4, and the edges of the frame 2 are compressed by the sides of the vertical compression jig 4 and the preforming jig 5. The frame body 2 is formed into a ring shape in the next step.

Next, as shown in D, the preforming jig 5 is moved back, and the frame 2 is formed into an annular shape using the inner periphery of the recess provided in the annular forming jigs 6a and 6b and the outer periphery of the vertical compression jig 4. .

Next, after raising the vertical compression jig 4 as shown in E, the annular forming jigs 6a and 6b are further advanced to combine the two jigs, and a cylindrical frame is formed by the recesses on both sides. As a result, the frame body 2 of the framework filter 1 is further formed into an annular shape by the annular forming jigs 6a and 6b and the material 3 which is compressed initially and becomes hard and dense.

Next, the annular molding jigs 6a and 6b are held in a pressurized state as shown in F, and the vertical compression jig 4 is lowered to compress the annularly molded frame filter 1 to its compression limit. As a result, the volume of the framework filter 1 is reduced in the thickness direction, and the frame filter 1 is formed into a disk shape.

Next, release the pressure of the vertical compression jig 4 as shown in
The disk-shaped frame filter 1 is released only in the thickness direction by raising it a little, thereby reducing uneven distribution of the material 3 and stress concentration in the frame 2 (once restored).

Next, the frame filter 1 is pressurized again using the vertical compression jig 4 as shown in H, and the pressure is maintained at the compression limit for a certain period of time. As a result, the repulsive force of the frame 2 and the material 3 due to the pressurization speed gradually decreases, and the volume is further reduced even at a constant pressure.

Since the present invention is constructed as described above in detail, the frame body does not bite into the filter material as shown in FIG. Can be suppressed.

Compared to the compression method shown in Fig. 2, according to the method of the present invention, the final thickness of the compressed material after restoration can be reduced to 5 to 5.
Can be made 10% thinner. If the frame filters whose volume has been reduced due to this effect are stored in 200 drums, one or two more filters can be stored in one drum, and the number of waste drums generated can be reduced. .

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional frame filter used in nuclear power plants, etc. Figure 2 A, B, C, D, and H are explanatory diagrams sequentially showing the compressed states of the conventional frame body.
Figure H is a view in the direction of arrow A in Figure 2 E, Figure 3 A is a side view showing the conventional frame and material in a compressed state, Figure 3 is a side view showing the restored state, and Figure 4 is a side view of the conventional frame body and material showing the compressed state. A perspective view of the device for carrying out the volume reduction method, Figure 5 A, B, C,
D, H, H, G, and C are explanatory diagrams sequentially showing the implementation states of the volume reduction method of the present invention, and FIG. 6A is a plan view showing the frame and material whose volume has been reduced by the method of the present invention.
FIG. 6B is a front view of the same. Explanation of main parts of the diagram 1...Framework filter, 2
... Frame body (outer peripheral frame member), 3 ... Material (filter material), 4 ... Vertical compression jig (cylindrical tool), 5 ...
Preforming jig, 6a, 6b... annular forming jig.

Claims (1)

[Claims] 1. In a method for reducing the volume of a frame filter consisting of an outer circumferential frame member made of a hard material that can be plastically deformed and a filter material installed in the frame member, the filter material of the frame filter placed on a table is The tool is compressed by the end face of a cylindrical tool, and while the tool is held in the compressed state, the frame member is pressed against the side surface of the tool from the outside to form an annular shape, and then the tool is removed and the tool is formed into an annular shape. The use characterized in that the frame member is further press-formed in a direction perpendicular to the compression direction of the tool, and then compressed again by the tool in the compression direction of the tool to form the whole into a disk shape. How to reduce the volume of a pre-framed filter.