JP6471289B2 - Small diameter pipe axial direction vertical cutting device - Google Patents

Description

  A large amount of small-diameter piping is generated in decommissioning 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. The present invention relates to a pipe vertical cutting apparatus that vertically cuts a small-diameter pipe in the axial direction in order to efficiently measure and decontaminate the contamination state due to radioactive substances on the inner surface of these small-diameter pipes.

  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. .

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

An apparatus for cutting a small-diameter pipe using a rotary knife blade in the circumferential direction is used in the industry under the name of a pipe cutter or the like. However, when using a rotary knife blade to cut a small-diameter pipe in the axial direction, there is nothing to support the pipe wall against the pressing force of the blade, so the pipe is recessed at the blade and difficult to cut. There was a problem that there was. In order to solve this problem, in the previous example, a method of preventing deformation by a method of sandwiching the piping wall between the rotating blade inserted inside and an external roller or a method of sandwiching the piping wall between the outer rotating blade and the core metal inserted inside was adopted. However, all of them have cutting blades and metal cores inserted inside the pipe, and after cutting the pipe contaminated with radioactive substances, the components of the equipment are contaminated with radioactive substances . There is a risk of spreading contamination to the piping. In order to prevent this, it is necessary to clean the blade part, the core metal, etc. 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 eliminates the need to insert a cutting blade or a cored bar into a small-diameter pipe where there is a concern of contamination by radioactive materials, and does not generate chips, so that the small-diameter pipe can be longitudinally moved in the axial direction at high speed. It was invented for splitting.

  A device that cuts a small-diameter pipe vertically in the axial direction, for example, a pair of left and right hydraulic cylinders that push the pipe to be cut, a guide roller that introduces the pipe into the cutting section, and an upper and lower section for cutting the pipe from the outer surface. Multi-stage rotary knife blades whose intervals are adjusted so that the amount of biting sequentially increases, and a rotary knife that counteracts deformation of the pipe by the rotary knife blade and crushes the pipe from the left and right to open the cut by the rotary knife blade A multi-stage compression deformation roller disposed in a direction perpendicular to the blade is provided.

The pipe pushed into the guide roller by the hydraulic cylinder is crushed from the left and right with the roller for compression deformation, and cut with a rotary knife blade from the top and bottom of the ellipse. In the next stage, the pipe is further crushed by the left and right compression deformation rollers to open the cut, and the cut is further deepened by the upper and lower rotary knife blades. This is sequentially repeated with a multi-stage compression deformation roller and a rotary knife blade. This eliminates the need to insert cutting blades and metal cores into small-diameter pipes where contamination by radioactive substances is a concern, and cuts small-diameter pipes in the axial direction at high speed in a way that does not generate chips. It is characterized by doing.
An axially vertical cutting apparatus for small-diameter pipes configured as described above.

  By using the present invention, it is possible to cut a small-diameter pipe that is normally 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. It can cut vertically at high speed without generating powder, and can reduce radioactive waste significantly by performing efficient measurement and decontamination.

It is a whole top view of a small diameter pipe axial direction vertical cutting apparatus. It is a whole side view of a small diameter pipe axial direction vertical cutting apparatus. It is principle explanatory drawing of a small diameter pipe axial direction vertical cutting apparatus. It is AA sectional drawing of a principle explanatory view (Drawing 3). It is BB sectional drawing of a principle explanatory drawing (FIG. 3). It is CC sectional drawing of a principle explanatory drawing (FIG. 3). It is DD sectional drawing of a principle explanatory drawing (FIG. 3). It is a side view (before piping deformation) of a pushing jig. It is a pushing jig side view (after piping deformation).

  For example, a cutting device having a structure in which a pipe is vertically cut by a hydraulic cylinder by pushing the pipe into a multistage compression deformation roller and a multistage rotary knife blade through a guide roller.

For example, a cutting device with a structure that crushes pipes sequentially with multi-stage 180 degree opposed compression deformation rollers to deform the pipe cross section into an oval shape

A pair of rotary knife blades facing each other at 180 degrees and deflected 90 degrees behind each compression deformation roller, for example, the apex of the small diameter part of the pipe whose section is deformed into an ellipse by pushing the pipe by the action of a hydraulic cylinder Incisions are made from the outside, the deformation is gradually strengthened by the compression deformation rollers and rotary knife blades arranged in multiple stages to open the cut and deepen the cut, and the cut is penetrated through the pipe thickness by the final rotary knife blade. A cutting device with a structure that cuts pipes vertically.

A structure that pushes the pipe into each compression deformation roller and pushes out the pipe from the compression deformation roller in the final stage. Pipe cutting device equipped with a jig.

  As shown in FIGS. 1 and 2, a pair of hydraulic cylinders (11) are arranged on a base (15), a push rod (13) connected to the rod (12), and a push jig at the tip ( 14), the pipe (1) is pushed into the vertically cut section (16).

  As shown in FIGS. 1, 2, and 3 to 7, the pipe (1) pushed in by the operation of the hydraulic cylinder is guided by the guide roller (10) to be the first-stage compression deformation roller (2 a) ( It is pushed in during 2b) and transformed into an ellipse. You may make it deform | transform sequentially with a guide roller. Subsequently, a cut is made by the first stage rotary knife blades (3a) (3b) arranged so as to bite into the apex on the small diameter side of the ellipse. At this time, deformation to the inside of the pipe due to the pressing force of the rotary knife blade is suppressed in advance because it has been deformed into an elliptical shape by the compression deformation roller.

  The cut is widened by compressing and deforming the pipe with the second-stage compression deformation rollers (4a) and (4b), and the cut is deepened with the second-stage rotary knife blades (5a) and (5b). Similarly, the third stage widens the cut and deepens the cut. Thereafter, the same thing is repeated sequentially. Any number of stages may be used.

  The notch is penetrated by the fourth-stage rotary knife blade (9a) (9b) at the final stage, and the pipe is cut vertically.

  In order to cut the pipe (1) vertically, the pipe shown in FIG. 8 and FIG. 9 has a pipe receiving groove (19) that fits into the cross section of the pipe, and the radial direction of the pipe about the movable pipe receiving shaft (20). The pipe is pushed by a pushing jig (14) provided with a pair of movable pipe receivers (17a) (17b) and a movable pipe receiver support (18). The pushing jig (14) follows the amount of deformation of the pipe by the compression deformation roller so that the distance between the pair of movable pipe receivers can be reduced and can pass through the compression deformation roller. be able to

  It can be used for applications in which a tubular or rod-shaped material is cut in the axial direction at high speed.

1 Piping
2a Roller for first stage compression deformation
2b Roller for first stage compression deformation
3a First stage rotating knife blade
3b First stage rotary knife blade
4a Roller for second stage compression deformation
4b Roller for second stage compression deformation
5a Second stage rotating knife blade
5b Second stage rotary knife blade
6a Roller for third stage compression deformation
6b Third stage compression deformation roller
7a 3rd stage rotary knife blade
7b 3rd stage rotary knife blade
8a Fourth stage compression deformation roller
8b Fourth stage compression deformation roller
9a 4th stage rotating knife blade
9b 4th stage rotating knife blade
10 Guide roller
11 Hydraulic cylinder
12 rods
13 Push rod
14 Pushing jig
15 base
16 Vertical cutting section
17a Movable pipe holder
17b Movable pipe holder
18 Movable piping support
19 Piping receiving groove
20 Movable piping support shaft

Claims (1)

A cutting device that sends a small-diameter pipe in the axial direction and divides it vertically,
A pair of left and right compression deformation rollers that crush the pipe pushed in the horizontal direction, and a pair of upper and lower rotary knife blades arranged to cut from the outside of the top where the radius of curvature of the crushed pipe is reduced , Arranged in multiple stages alternately in the pipe feed direction, with the compression deformation roller with the gap being narrowed sequentially for each stage, the deformation of the pushed pipe is sequentially increased for each stage to open the cut, By gradually deepening the cut with a rotary knife blade with a gap adjusted to deepen the cut for each stage and finally penetrating it, the components of the device directly contact the radioactive material adhering to the inner surface of the pipe to expand contamination. Features a structure that cuts the pipe in the axial direction without having to
Pipe axis vertical cutting device.