JPH0542639B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a clip removing device suitable for removing clips from spent fuel channel boxes.

[Background of the invention]

Conventionally, highly radioactive solid waste from spent fuel channel boxes generated from nuclear reactors has been stored in its original form in spent fuel storage pools or highly radioactive solid waste storage pools of nuclear power plants. However, the spent fuel channel box is a long box with a rectangular cross section, and has a problem in that the storage density during storage is low and the storage space is extremely large. Therefore, there is a need to improve storage efficiency by cutting spent fuel channel boxes into shapes suitable for storage, such as flat plates. In order to meet this demand, a spent fuel channel box cutting device has already been developed. However, these methods involve punching or shearing with a rotary cutter, and it takes time to cut the spent fuel channel box, and since the clips are not removed, the volume reduction efficiency is disadvantageous.

[Purpose of the invention]

An object of the present invention is to provide a clip removing device that efficiently removes a clip provided at the upper end of a spent fuel channel box before cutting the spent fuel channel box body, in order to make the spent fuel channel box into a shape that is easy to store. Our goal is to provide the following.

[Summary of the invention]

By removing the triangular clips at opposite corners of a spent fuel channel box with a rectangular cross section before cutting the spent fuel channel box itself, it is possible to improve the efficiency when cutting the main body and also improve the volume reduction rate. has a big effect.

Therefore, in order to achieve the above object, the present invention provides a device for removing a clip provided at the upper end of a spent fuel channel box. It consists of a cutter adapted to the shape of the attachment part of the channel box of the clip, and a drive means provided in the main body for moving the cutter in the longitudinal direction of the channel box, and the drive means applies the driving force to the cutter. In the clip removing device for removing the clip of the spent fuel channel box by applying a clip, the lower end of the main body is configured with a tapered guide, and the cutter provided on the main body is rotatable in opposite directions. The main body is further provided with a pressing mechanism for pressing the clips at respective positions of the cutter where the clips are to be cut.

That is, the present invention uses a mechanical shear removal device to remove the clip that drives the cutter. Further, by providing two cutters, the two clips located at opposite corners of the fuel channel box can be removed at once, so that the fuel channel box can be removed efficiently.

In addition, since a pressing mechanism is provided to press the clip at each position where the clip is to be cut, the clip is held while being cut by the cutter and the pressing mechanism, thereby preventing the clip from falling after being cut and removed.
Can prevent scattering.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
In FIGS. 1 and 2, the main body of this device is a hydraulic cylinder, and a cylinder rod 3 is provided in the center of the device, and a cylinder 2 is provided outside of the cylinder rod 3.
A tapered guide 10 is provided at the lower end of the cylinder rod 3 to facilitate attachment to the spent fuel channel box 9. The cutter 1 is connected to the cylinder rod 3 by a pin 11 and has a triangular shape to facilitate shearing the clip. Further, a small cylinder rod 4 is provided which presses the clip from above, and the clip is sheared while being held between the cutter 1 and the cylinder rod 4.

A shaft 5 is provided in the cylinder rod 3, and a rack is cut at the lower end of the shaft 5, which engages with the pinion portion of the cutter 1. In the event that the clip cannot be cut, rotating the bolt 7 will cause the shaft 5 to descend downward, the rack of the shaft 5 transmits the rotation to the pinion of the cutter 1, and the cutter holder 14 uses the pin 11 as a fulcrum. The cutter 14 is closed in a V-shape as shown in the imaginary line, and can be taken out from the spent fuel channel box 9.

The spent fuel channel box will be explained with reference to FIG. The spent fuel channel box 9 has a rectangular cross section, and a triangular clip 12 is welded to the upper end.

In FIGS. 4 and 5, this device is installed from above the spent fuel channel box 9. The lower end of the device is attached avoiding the clip 12.
When this device is installed on the top surface of the spent fuel channel box 9, the seating indicator 13 shown in FIG. 2 is folded down and can be visually confirmed from above.

Also, when installing, cutter 1 and cutter holder 1
4 can escape to the inside of the device to avoid interference with the clip 12. This is the 6th
This will be explained with reference to FIG.

As shown in Fig. 6, the cutter holder 14 is
2, the cutter 1 and the cutter holder 14 rotate around the pin 11 as a fulcrum. At this time, the cutter holder 14 is a pinion gear, and performs the operation of lowering the shaft 5 via the rack at the lower end of the shaft 5. When the shaft 5 is lowered, a spring 6 shown in FIG. 7 is compressed. The compressed spring 6 is constantly exerted upward force, and the stopper 1 provided at the upper end of the shaft 5
A force is acting on 7. When the cutter holder 14 is positioned below the clip 12, the cutter 1 and the cutter holder 14 return as shown in the imaginary line.

A mechanism for removing the clip 2 will be explained with reference to FIGS. 1 and 8. High-pressure water is supplied to the cylinder 2 of this device attached to the used channel box 9.
At the same time, high pressure water is also supplied to the small cylinder rod 4, which presses the clip 12 from above. Next, the cylinder rod 3 is pulled upward, and at the same time the cutter 1 is moved upward. The clip 12 is held between the cylinder rod 4 and the cutter 1 and sheared upward.

Since the sheared clip 2 is held between the cutter 1 and the cylinder rod 4, the clip 2 is released. This will be explained with reference to FIGS. 9 and 10. Lower the cylinder rod 3 downward using high pressure water. The cutter holder 14 is provided with a spring 16 and a pin 15, and the spring 16 is attached to the pin 15.
push up. Clip 2 is pushed and falls as shown in the imaginary line.

Clip removal is now complete.

〔Effect of the invention〕

According to the present invention, it is possible to remove the triangular clips at the opposite corners of the spent fuel channel box at once, and to prevent the clips from falling and scattering after removal, which makes cutting the spent fuel channel box more efficient. can be improved.

[Brief explanation of the drawing]

Fig. 1 is an overall view of a spent fuel channel box clip removal device according to an embodiment of the present invention, Fig. 2 is a cross-sectional view AA of Fig. 1, Fig. 3 is an overall view of the spent fuel channel box, and Fig. 4 5 is a cross-sectional AA view of FIG. 4, FIG. 6 is a diagram of the cutter escape mechanism, FIG. 7 is an explanatory diagram of the cutter escape mechanism and the device ejection mechanism when cutting is not possible, and FIG. 8 is a diagram of the installation process of the device. ~No. 10
The figure is an explanatory diagram of the clip operation. 1...Katsu, 2...Cylinder, 5...Shaft, 8...Hanging bracket, 10...Guide, 13...
Seating indicator.

Claims (1)

[Scope of Claims] 1. A device for removing a clip provided at the upper end of a spent fuel channel box, comprising: a main body of the clip removing device; It is composed of a cutter that matches the shape of the attachment part, and a drive means provided in the main body to move the cutter in the longitudinal direction of the channel box, and the drive means applies the driving force to the cutter to remove the used cutter. In a clip removing device for removing a clip from a fuel channel box, the lower end of the main body is configured with a tapered guide, two cutters provided on the main body are provided so as to be rotatable in opposite directions, and further, A clip removing device characterized in that the main body is provided with a pressing mechanism that presses the clip at each position of the cutter where the clip is to be cut.