JP2019018252A - Small diameter pipe material continuous vertical split device - Google Patents

Abstract

To efficiently perform contamination measurement and decontamination of a small diameter pipe material where an inner face may be contaminated with a radioactive material, and efficiently perform vertical split and cut of a long small diameter pipe material in an axial direction without expanding internal contamination in order to reduce radioactive wastes.SOLUTION: A device is provided for performing the vertical split and cut of a long small diameter pipe material in an axial direction, the pipe material that is represented by a heat transfer pipe of a heat exchanger. The device includes: a motor-driven feed roller for feeding a small diameter pipe material; a pair of cut blades for giving a pair of cut flaws on upper and lower surfaces of the pipe member and being opposed by 180 degrees; a pair of right and left crush rollers deflected by 90 degrees; and a pair of rotating knife blades arranged so as to be pressed into the cut flaws in the same position as the crush rollers. The pipe member fed by the feed roller is provided with the cut flaws by the cut blades, and the pipe member is crushed approximately 100% while being fed by the crush rollers, and thereby the cut flaws positioned at both ends are opened. Also, the curvature of the portion is reduced and it becomes hard to be deformed, and therefore the flaws penetrate through the wall thickness by the knife blades pressed by the cut flaws. Accordingly, the small diameter pipe material is vertically split and cut in an axial direction continuously at high speed.SELECTED DRAWING: Figure 1

Description

A large amount of waste heat transfer tubes are generated in the decommissioning work or heat exchanger replacement work at nuclear power plants. It is assumed that these materials must be disposed of as radioactive waste because it is difficult to measure the contamination status of radioactive materials on the inner surface and to decontaminate radioactive materials. In order to efficiently measure and decontaminate the inside surface of small-diameter pipe materials such as heat transfer tubes of these heat exchangers with radioactive materials, the present invention is a small-diameter pipe material that vertically cuts the small-diameter pipe material in the axial direction. The present invention relates to a continuous vertical dividing device.

2. Description of the Related Art Conventionally, a pipe material vertical cutting apparatus using a multistage rotary blade is known as an apparatus for vertically cutting a small-diameter pipe. (For example, refer to Patent Document 1.) This is a device that uses a hydraulic cylinder to push out a pipe material to a cutting portion, and cuts the pipe vertically by a rotating blade inserted inside the pipe and an outer auxiliary roller. In this apparatus, since the rotary blade unit is inserted inside the tube, there is a possibility that the contamination of the radioactive material may be expanded to other tubes after the tube whose inner surface is contaminated with the radioactive material is cut.

There is also known a pipe or plate longitudinal cutting device in which a band saw is installed on a movable carriage. (For example, refer to Patent Document 2.) This device also has a risk of expanding the contamination of the radioactive material to other pipes by a band saw, and a large amount of chips are generated and the cutting speed is slow.

There is also known a pipe cutting device that uses a jack to push in a conical blade with a plurality of blades attached from the end of the pipe to cut the pipe in the axial direction. (For example, refer patent document 3.) Since this apparatus also inserts a conical blade in a pipe material, there exists a possibility that the contamination of a radioactive substance may expand to another pipe | tube, and the durability of a blade also has a subject.

Also known is a half-diameter pipe half-cutting machine that cuts a cutting guide rod inserted concentrically with the pipe with a feed saw placed before and after the cutting tip saw and cuts with a tip saw into a core bar. . (For example, refer to Patent Document 4.) Since this apparatus also inserts a cutting guide rod into the pipe, there is a risk of expansion of radioactive material contamination in other pipes, and a large amount of chips are generated and the cutting speed is slow. .

There is also known an apparatus in which a rod-shaped receiving blade is inserted into a pipe material and the pipe material is continuously fed by a pair of rotary shearing blades from the outer surface of the pipe and cut with a shearing force. (For example, refer to Patent Document 5.) Since this apparatus also inserts a rod-shaped receiving blade into the inner surface of the pipe material, there is a risk of contamination of other pipes due to radioactive substances.

4-92718 Utility Kaihei 1-60820 JP2015-229213A Patent No. 4035083 Patent No. 4771143

A conventional vertical splitting device for small-diameter pipes inserts cutting blades or cores into the pipe, and after cutting the pipe contaminated with radioactive material, there is a risk of spreading the contamination to other pipes. is there. In order to prevent this, it is necessary to clean the blade part, the core metal, and the like after cutting after each cutting operation, and the working efficiency is remarkably deteriorated.

In a cutting device using a band saw or tip saw, there is a concern that a large amount of contaminated swarf is generated after cutting work contaminated with radioactive material, and the contamination is spread to the device and other uncontaminated piping. In addition, the cutting speed is slow and the efficiency is poor.

The present invention is a method in which a small-diameter pipe material is axially moved at high speed without inserting a cutting blade or a cored bar into a small-diameter pipe material, which is likely to be contaminated by radioactive substances, and without generating chips. It was invented for splitting.

A device that vertically cuts a small-diameter tubular material represented by a heat transfer tube of a heat exchanger in the axial direction, for example, two pairs of feed rollers facing each other at 90 degrees for feeding the pipe material to be cut, and an outer surface of the tubular material The cutting blades that face each other at 180 degrees, the pair of crushing rollers that face each other at 180 degrees, and the crushing rollers are deflected 90 degrees to penetrate the cuts on the surface of the pipe material. It has a structure with a pair of rotating knife blades facing each other 180 degrees.

A pair of scratches are made with a cutting blade on the surface of the pipe material continuously fed by the feed roller at 180 degrees, and the pipe material is crushed by the crushing roller from the direction deflected by 90 degrees from this scratch. When the pipe is crushed, the radius of curvature of the pipe material at the position of the wound is reduced, and the rigidity is increased and the wound is opened. By pushing a rotary knife blade facing the opened wound 180 degrees, the wound is penetrated and the pipe is continuously cut into two in the longitudinal direction. This eliminates the need to insert cutting blades or metal cores into small-diameter pipes where contamination by radioactive materials is a concern, and allows long-sized small-diameter pipes to be produced in a manner that does not generate chips contaminated with radioactive substances. A small-diameter tubular material continuous vertical splitting device that cuts into two in the vertical direction continuously at high speed.

By using the present invention, it is usually possible to measure a small-diameter pipe that is difficult to measure the contamination status of radioactive materials on the inner surface and to decontaminate radioactive substances without inserting a cutting blade or a cored bar into the pipe. Long, small-diameter pipes can be continuously cut at a high speed without generating material-contaminated chips, and radioactive waste can be significantly reduced by efficient measurement and decontamination. .

It is a whole conceptual diagram which shows an example of a small diameter pipe material continuous vertical dividing apparatus. It is a plane conceptual diagram which shows an example of a small diameter pipe material continuous vertical dividing apparatus. It is principle explanation sectional drawing which shows an example of a small diameter pipe material continuous vertical dividing apparatus.

Hereinafter, modes for carrying out the present invention will be described.

FIG. 1 is an overall conceptual diagram for explaining an example of a small-diameter continuous pipe vertically dividing apparatus to which the present invention is applied.

A feed roller is provided to push the small diameter pipe material into the cutting part. In the case of a small-diameter pipe with a particularly thin wall, if it is pushed in with a hydraulic cylinder or the like, there is a risk of buckling. In addition, a long pipe needs to be cut to a length shorter than the stroke of the hydraulic cylinder. Therefore, the tube material is sandwiched between a pair of feed rollers, and the tube material is fed into the cutting portion by rotating the feed roller. This roller may be one stage or multistage.

In order to make a notch facing 180 degrees to the pipe material that has been sent, a notching blade facing 180 degrees is provided. The cutting blade does not need to penetrate through the tube wall thickness, and only needs to make a cut on the surface. A small amount of swarf may be generated here, but it is not contaminated by radioactive material because it is on the outer surface. An appropriate cutting blade such as a diamond cutter or a carbide tool can be used.

It is equipped with a pair of crushing rollers that are 180 degrees facing each other and a 90 degree deflection on the surface of the pipe. This crushing roller facing 180 degrees sandwiches the pipe material and has a function of sending out the pipe material while crushing the pipe material nearly 100%. By this crushing, the curvature of the cut portion of the pipe material becomes very small, the rigidity becomes high, and the buckling force by the rotary knife blade does not buckle. At the same time, the incision is opened and the rotary knife blade is easy to enter.

A rotary knife blade facing 180 degrees is provided at the position where the tube material is crushed by the crushing roller so as to coincide with the notch on the surface of the tube material. The tube is cut by penetrating the wound by pushing the rotary knife blade into the crushed and opened cut wound. The tube material is crushed and the radius of curvature of the portion is reduced, and the rotating knife blade penetrates the wall thickness without being deformed by the pushing force of the rotating knife blade. The rotary knife blade itself may have a driving force.

1 and 2 show an overall conceptual diagram and a plan conceptual diagram of an embodiment of the present invention. FIG. 3 is a cross-sectional view at each position for explaining an embodiment of the present invention.

From the entrance side of the small-diameter pipe material, there are a pair of first-stage feed rollers 9a, 9b which are driven by first-stage feed motors 10a, 10b. FIG. 3A shows a cross-sectional view at this position. Next, there is a pair of second-stage feed rollers 7a, 7b on the left and right, which are driven by second-stage feed motors 8a, 8b. The pipe material is fed by these feed rollers.

Cutting blades 6a and 6b facing up and down 180 degrees are installed, and a cut is made on the outer surface of the small-diameter pipe material sent. FIG. 3B shows a cross-sectional view at this position.

The pipe material is crushed to almost 100% with a pair of crushing rollers 2a and 2b from the left and right sides of the small-diameter pipe material with the cuts in the top and bottom. As a result, the curvature of the incision flaw portion at the upper and lower positions of the pipe material becomes very small, the rigidity becomes high, and deformation becomes difficult. In addition, the surface of the incision is opened. These crushing rollers are driven by crushing motors 3a and 3b, and feed the pipe material while crushing it. The rotary knife blades 4a and 4b arranged vertically at the same position are pushed through and penetrated from the opening portion of the cut flaw on the tube surface. FIG. 3C shows a cross-sectional view at this position. The rotary knife blade is driven in the direction of pushing out the tube material by the rotary knife blade motors 5a and 5b.

The small diameter pipe material that has been crushed and divided into left and right is extruded as it is. Contamination due to radioactive materials on the inner surface of the tube material can be easily measured and efficiently decontaminated as necessary.

1 small diameter pipe material
2a crushing roller
2b crushing roller
3a crushing motor
3b Crushing motor 4a Rotary knife blade 4b Rotary knife blade 5a Rotary knife blade motor 5b Rotary knife blade motor 6a Cutting blade 6b Cutting blade 7a Second-stage feed roller 7b Second-stage feed roller 8a Second-stage feed motor 8b Second stage Feed motor 9a First stage feed roller 9b First stage feed roller 10a First stage feed motor 10b First stage feed motor

Claims (3)

A small-diameter tubular material continuous vertical splitting device with a structure that continuously cuts axially from the outside of the crushed ends with a rotary knife blade while crushing small-diameter tube material with a rotating roller 2. A small-diameter tubular material according to claim 1, further comprising a cutting blade for making incisions at both ends when the small-diameter tube material is crushed, and for opening the rotary knife blade easily when it is crushed. Vertical device 2. The small-diameter tubular material continuous vertical splitting device according to claim 1, comprising a single-stage or multi-stage feed roller for stably and smoothly feeding the small-diameter pipe material to the cutting blade, the crushing roller, and the rotary knife blade.