JPH0260158B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Related Field) The present invention relates to a filter media treatment device for waste HEPA filters used in nuclear power plants.

(Conventional technology) Until recently, nuclear power plants
The HEPA filter was stored in a box palette. However, due to limited storage facilities, the volume of the product was reduced. However, when processing is actually carried out and the filter media separated from the frame is filled into a drum and compressed, the four corners of the filter stand up in the drum and cannot be compressed any further, leaving wasted space. Especially in the case of the last filter, we had to leave enough space for the raised ears to fit inside the drum and create a lid. Even so, perhaps because the filling efficiency is better than that of ordinary waste, when no load is applied after compression, the bottom of the drum swells and the can tilts, and then when the disk descends,
There was a case where it collided with the caliber of a drum and crushed it. In addition, when the filter media is compressed, the diameter of the drum is deformed by more than 1% and the lid cannot be fitted, although the cause is unknown, and there is a problem with compressing the filter media directly inside the drum. That's what I found out. Furthermore, if you try to increase efficiency by compressing the filter media by squeezing it out of the filter frame and filling it directly into drums through the hopper, the height of the equipment itself will be very high, which will limit the work area at the power plant. Summer.

(Purpose) This device was developed in order to solve these problems, and aims to provide a device for forming a filter medium that has been compressed into a thin circular plate shape before being put into a drum. Furthermore, it is an object of the present invention to provide an apparatus that can press out and compression mold the square shape when it can be accommodated in the square shape.

(Summary of configuration) A cutting die that is movable up and down with respect to the machine frame and has a disk for compressing filter media that can move up and down in the center, and a square filter is placed at the bottom of the cutting die, A base plate with a square hole in the center and a disc at the bottom of the base plate that can pass through the center.
This filter media processing device is characterized by a filter media corner compression device consisting of four presses whose inner surfaces are 1/4 of the circumference, and which enables efficient filling of waste HEPA filters into drums.

(Example) Hereinafter, an example of an apparatus for forming a compressed filter medium into a thin disk shape will be described.

FIG. 1 is a perspective view of this device. 1 is the machine frame which acts as a powerful compressive force generating device necessary to press out the filter or compress the filter medium into a thin disk shape, and 2 is the cutting die that presses out the filter medium from the filter frame. Seen from below. As shown in Figure 2, the cutting die 2
Disk 3 for compressing the circular filter medium inside the
is housed therein and is concentric with the cutting die 2 so that it can be operated simultaneously with the cutting die 2 or separately. Reference numeral 4 denotes a base plate on which a filter is placed for depressurization.The filter is placed on this base plate, and the filter medium is pressed down through a square hole 4' formed in the base plate 4 using a cutting die 2.

Reference numeral 5 denotes a compression device that shapes the filter material that has fallen in a square shape into a circular shape.As shown in Fig. 3, it is made up of four press molds 6 each having an inner peripheral surface that divides the circumference into four parts, and these molds compress the filter material from all sides. Press the corners to form a circle. Note that 6' indicates a state in which the pressing mold is pushed forward by a hydraulic cylinder 7 or the like. The cutting die 2 can only be lowered to the lower end of the square hole 4', but the disk 3 inside the cutting die 2 can be lowered to the lowest part of the compression device 5 and pressurized, and is shaped into a circular shape by the compression device 5. A thin disk is created by compressing the filter medium in the axial direction. Although not shown, a knock-out device is installed on the lower surface of the compressor, so that after removing the compressed filter frame, the thin disk of the filter medium can be lifted higher than the base plate 4 and easily taken out. There is.

(Effects) With the above configuration, the volume reduction rate of the filter pressed by this device is such that the compressed filter material can be evenly accommodated in the drum, and there is also a space corresponding to the height of the ears at the corners of the filter material. It is no longer the case that the number of fillings is limited in practice due to the fact that the drums are left behind or the drums are tilted severely. This has resulted in a 30-40% higher capacity than before. Furthermore, during actual work, by crushing the diameter of the can with the inclination of the drum, there is no loss that would make the drum unusable, and the height of the device is more than 1 meter lower than the conventional one. This eliminates the need to choose a work location within the power plant and allows work to be done anywhere.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the device of the present invention. Figure 2 is a back view of the cutting die. FIG. 3 is a plan view of an apparatus for forming a filter medium into a circular shape. In the figure, 1... Machine frame (for generating compressive force);
2... Cutting die, 3... Disk, 4... Base plate, 4'...
...Square hole, 5... Compression device (for filter media), 6... Push die, 6'... State where the push die is pushed out, 7...
hydraulic cylinder.

Claims (1)

[Claims] 1 A cutting die 2 that is movable up and down with respect to the machine frame 1 and has a disc 3 for compressing filter media that can be moved up and down in the center.
A square filter is placed at the bottom of the cutting die 2, and a base plate 4 is provided with a square hole 4' in the center.
A filter media processing device for waste HEPA filters, characterized in that the filter media compression device 5 is made up of four press molds 6, through which the inside surface of the waste HEPA filter can pass, and whose inner surface is 1/4 of the circumference.