JP4509732B2 - Small-diameter piping halving method and apparatus - Google Patents

Description

When retirement small diameter piping of SUS-made heat exchanger capillary or the like which is used in nuclear power plants, it is necessary to verify that there is no adhesion of the radioactive material in small diameter in the pipe. Since the small-diameter pipe has a small inner diameter, it is difficult to measure the contamination in the pipe as it is with a survey meter or the like.

  The present invention relates to a small-diameter pipe halving method for facilitating verification of the inner surface of a small-diameter pipe having a pipe diameter of about 34 to 10 mm with a radiation measuring instrument such as a survey meter, and an apparatus for carrying out this halving method. Is.

The following methods (1) to (4) are known as the half-dividing method for small-diameter pipes as described above .
(1) Pipe material vertical cutting apparatus using a multistage rotary blade (see Patent Document 1);
This apparatus is an apparatus that uses a hydraulic cylinder to push out a pipe material to a cutting portion and cuts the pipe in a vertical split with a rotary blade. For this reason, it is necessary to cut the pipe to a certain length in advance according to the length of the hydraulic cylinder. Also, there is a problem that only straight piping is targeted, and bent piping cannot be divided vertically.
(2) Vertically cutting apparatus for pipes or plates with a band saw installed on a movable carriage (see Patent Document 2);
This device is also tubing to cut it is necessary to cut in advance to a certain length. In addition , there is a problem that a bent pipe cannot be divided vertically.
(3) A device for inserting a metal core into a pipe and cutting it with a circular saw blade (see Patent Document 3);
Although this apparatus can cut | disconnect the pipe | tube with a small diameter by adjusting the magnitude | size of a metal core, it cannot be applied to piping with a very small diameter. Moreover, it is necessary to cut | disconnect the length of a pipe | tube to the length shorter than a metal core . In order to completely halve the core, it is necessary to turn the core bar 180 ° and turn the groove upside down as the saw blade, and then reciprocate the circular saw blade once. Also, bent pipes cannot be divided vertically.
(4) The procedure for cutting the pipe material to be cut, which has been a problem in the techniques of (1) to (3) above, to a predetermined length can be omitted, and a disc-shaped tip saw while feeding an arbitrary length and diameter pipe There is also a device (see Patent Document 4) that cuts at a point, but this is not applicable to the longitudinal division of a bent pipe.
In the pipe halving devices of (1) to (4) above, the halved pipe remains in a semicircular shape. Therefore, when measuring the decontamination work after halving and the presence of radioactive substances, A post process of pressing in a plate shape with a press machine or the like is required.
Japanese Utility Model Publication No. 4-92718 Japanese Utility Model Publication No. 1-60820 Japanese Patent Laid-Open No. 10-309623 Japanese Patent Application No. 2003-170702

In the conventional technology as described above, it is difficult to halve the tube without using a relatively straight tube. In addition, a post-process for making the pipe after half-split into a plate shape may be required for the removal of contamination adhered to the surface of the pipe after half-split and the survey of pollution.
The present invention, by performing both shearing of pressing the longitudinal side ends of the small-diameter piping in a series of steps, it is possible to halved the small-diameter piping two plate-like body, the pipe It has been impossible to halve until now by eliminating the need for plate processing of new piping for removal of contaminated contamination and surveying contamination, and making small-diameter piping into a plate with a press. It was bent pipe and an object to be able to be halved in the U-shaped tube, and its object is to provide an apparatus for implementing the method and this method permits them.

The method of the present invention is a half way of small diameter piping used in nuclear power plants, a pressing step of a flat tube of small bore piping flop-less machine, the longitudinal sides of the flattened pipe shirring was cut with the machine Ri Do and a cutting step of separating into a two plate-like body and the side cut pieces,
In the pressing step, the small-diameter pipe set in the small-diameter pipe feeding guide of the press machine is sent between the upper mold and the lower mold by the small-diameter pipe feeding machine, and is pressed by the upper and lower molds. To a flat tube, and the flat tube is sent to the flat tube delivery guide by a flat tube delivery machine,
In the cutting step, the flat tube coming out of the flat tube delivery guide is fed between the shear upper die and the lower shear die by the flat tube feeder from the flat tube feeding guide of the shearing machine, and the upper and lower By cutting both sides in the longitudinal direction of the flat tube with a shear die, the two side plates are separated into two plate-like bodies and side cut pieces, and the two plate-like shapes are removed. The body is sent to a plate-like body delivery guide by a plate-like body delivery machine .
An apparatus for carrying out the method of the present invention is a small-diameter pipe halving apparatus used in a nuclear power plant, and presses a small-diameter pipe between an upper mold and a lower mold to produce a flat pipe. consists to the press, a shearing machine for shearing the longitudinal sides by the shear upper die and the shear the lower mold of the flat tube and,
The press machine is a small-diameter pipe feeding machine for sending a small-diameter pipe set in a small-diameter pipe feeding guide between the upper mold and the lower mold, and a flat pipe after pressing is sent as a flat pipe. a flat tube feeding device to send to the guide,
The shirring machine, a flat tube after the pressing, and Iriki feed flattened pipe for sending the flattened pipe infeed guide between the shear upper die and the shear the lower mold having two shear blades, the two Like in shear blade longitudinal side edge portions by cutting the upper and lower two removing the side edge portions cut piece plate body of the flat tube, and a plate-like body feeding device for sending to the plate-like body dispatch guide It is characterized by being .

According to the method and apparatus of the present invention, in the step of pressing the small-diameter pipe , the flat-tube is formed by the press machine while the small-diameter pipe is fed by the small-diameter pipe feeder . And, in the step of cutting the flat tube after pressing, since both ends in the longitudinal direction of the flat tube are cut with a shearing machine to form two upper and lower plate-like bodies, the decontamination work after halving the pipe and Inspection for removal of radiation deposits becomes very easy .
Further, the flat tube after the pressing, while feeding in flat tube infeed machine between the shear upper die and the shear the lower mold, since cutting the longitudinal both end portions of the flattened pipe by two shear blades, straight course, will be able to split the bent pipe but the plate-like body, decontamination and survey work becomes extremely easy.

With reference to FIG. 1, the outline | summary of a halving construction method is demonstrated.
A small-diameter pipe 1 used in the nuclear reactor is pressed by a press A shown in FIG.

Next, the flat tube 2 after the press is cut and removed at the positions indicated by reference numeral 3 in FIG. 1 by the shearing machine B shown in FIG. , 4 and the cut side end pieces 5 and 5 are separated.

The press machine A used in the above-mentioned half splitting method includes a press upper die 6 and a press lower die 7, a small-diameter pipe feeder 8 and a small-diameter pipe feed guide 9 shown in FIG. It consists of a tube delivery machine 10 and a flat tube delivery guide 11 after pressing.
When carrying out the above-mentioned half splitting method, the small-diameter pipe 1 set in the small-diameter pipe feed guide 9 is fed onto the press lower mold 7 by the small-diameter pipe feeder 8 and the upper mold 6 in pressing the small diameter piping 1 on the lower mold 7. The small-diameter pipe 1 is fed semi-automatically in accordance with the movement of the press machine A.
The flat tube 2 formed into a flat plate shape by pressing the small-diameter pipe 1 is semi-automatically matched with the movement of the press machine A and is pressed by the flat-tube feeder 10 in the same manner as the small-diameter pipe feeder 8. Then, it is sent out toward the flat tube delivery guide 11.

Next, the flat tube 2 pressed into a plate shape by the press machine A is sheared at both ends in the longitudinal direction by the shearing machine B (FIG. 4) to form two upper and lower plate bodies 4. The shearing unit B, Shah mold 12, feed flattened pipe Iriki 13, flat tubes infeed guide 14 comprises a sheet-like member feeding device 15 and the plate-like body delivery guide 16,. The shearing machine B also feeds the flat tube 2 on the flat tube feed guide 14 toward the shear mold 12 by the flat tube feed machine 13 semi-automatically in accordance with the movement of the press machine A.

The shear mold 12 includes a shear upper mold 17 and a shear lower mold 18 shown in FIG. 5, and a shear blade 20 is attached to the shear upper mold 17. The flat tube 2 after pressing is inserted into the shear mold 12 from the flat tube insertion port 19, and the shear upper mold 17 is pressed toward the shear lower mold 18 against the upper mold support spring 21. The both ends in the longitudinal direction of the flat tube 2 are sheared by the shear blade 20 ( position 3 in FIG. 1) and separated into two upper and lower plate-like bodies 4 and side end cut pieces 5. Side end portion cut piece 5, as shown in FIG. 4, Ru is removed to fall to the bottom of the shearing machine.

The press machine A and the shearing machine B are preferably installed in series, but it is of course possible to install them separately and work in batch operations due to the problem of installation location.

The conceptual diagram of the half split method of small diameter piping. The block diagram of a press machine. The perspective view of a press die. The block diagram of a shearing machine. The perspective view of a shearing metal mold | die.

  A press machine, B shearing machine, 1 small-diameter pipe, 2 flat tube after pressing, 3 cutting positions at both ends in the longitudinal direction, 4 (separated) plate-like body, 5 side end cutting pieces, 6 press top Mold, 7 Press lower mold, 8 Small-diameter pipe feeding machine, 9 Small-diameter pipe feeding guide, 10 Flat tube feeding machine after pressing, 11 Flat pipe feeding guide after pressing, 12 Shear mold, 13 Flat Pipe feeding machine, 14 Flat pipe feeding guide, 15 Plate body feeding machine, 16 Plate body feeding guide, 17 Shear upper mold, 18 Shear lower mold, 19 Flat tube insertion port after pressing, 20 Shear blade, 21 Upper mold support spring.

Claims (2)

A halving method for small-diameter pipes used in nuclear power plants,
From the small diameter pipe and the press step of a flat tube-flop-less motor, a cutting step for separating the longitudinal sides of the flattened tube and cut into two plate-like body and the side cut pieces in shearing machine Do Ri,
In the pressing step, the small-diameter pipe (1) set in the small-diameter pipe feeding guide (9) of the press machine (A) is transferred to the upper die (6) and the lower die by the small-diameter pipe feeding machine (8). It is sent to and from the mold (7), pressed by the upper and lower molds (6, 7) to make a flat tube (2), and the flat tube (2) is sent by the flat tube delivery machine (10). Sent to the guide (11)
In the cutting step, the flat tube (2) coming out of the flat tube feed guide (11) is moved from the flat tube feed guide (14) of the shearing machine (B) to the upper portion of the shear by the flat tube feed machine (13). Two sheets are sent between the mold (17) and the lower shear mold (18), and the upper and lower shear molds (17, 18) are used to cut both longitudinal sides of the flat tube (2). The plate-like body (4) and the side-cut piece (5) are separated and the side-cut piece (5) is removed, and the two plate-like bodies (4) are sent to the plate-like-piece feeder (15). ) To the plate-shaped body delivery guide (16)
A halving method characterized by that . A halving device for small-diameter pipes used in nuclear power plants,
A small-diameter pipe (1) an upper mold (6) and the flat tube and pressed between the lower mold (7) (2) to press (A), the longitudinal direction of the flat tube (2) It consists of a shearing machine (B) that shears both sides with a shear upper mold (17) and a shear lower mold (18) ,
The press machine (A) has a small diameter for feeding a small diameter pipe (1) set in a small diameter pipe feeding guide (9) between the upper mold (6) and the lower mold (7). A pipe feeder (8), and a flat pipe delivery machine (10) for sending the flat pipe (2) after pressing to the flat pipe delivery guide (11) ,
The shirring machine (B), the flat tube after the pressing (2), flattened tube infeed guide (14) from shear the upper mold having the two shear blades (20) (17) and shear the lower mold the type (18) feeding flattened pipe to send between Iriki (13), said flattened tube at the two shear blades (20) (2) longitudinal side edge portions by cutting the side edge portions cut pieces of ( A halving device comprising: a plate-like body sending machine (15) that sends the upper and lower two plate-like bodies (4) from which 5) has been removed to a plate-like body feeding guide (16) .

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