JP3249442B2 - Pipe cutting method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe cutting method and an apparatus therefor, and more particularly to a JMTR (Japan Material T.).
It is effective when applied to the cutting of specimens in irradiation tests of breeding blanket materials in esting reactors.

[0002]

2. Description of the Related Art In a nuclear power plant or the like, in order to replace or remove a pipe whose inside is contaminated with a radioactive substance, if it becomes necessary to cut the pipe, conventionally, as shown in FIG. After crimping the pipe 100 over a range of 50 to 100 mm with a crimp fitting 112 provided at the tip of the robot arm 111 and crimping the pipe 100 so that the inner surface of the pipe 100 is in close contact, as shown in FIG. The crimping portion 100a of the pipe 100 is gas-cut by a cutting torch 123 provided via an electric slide 122, or is mechanically cut by a saw blade or the like.

[0003]

SUMMARY OF THE INVENTION A pipe 1 as described above
In the case of 00, a thermocouple or an insulator may be inserted therein. In such a case, the piping 100
It is difficult to completely adhere the inner surface of the pipe 100 even when pressure-bonded as described above. There is a risk of leakage or scattering.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a pipe cutting method according to the present invention has a paired case.
With the box that can be opened and closed, the periphery of the pipe is shielded so as to partition it from the outside, and while the inside of the box is sucked, the pipe is crimped and cut, and then the cut end of the pipe is covered. And Also, the piping described above
In the cutting method, put the cap with the adhesive inside
The cut end of the pipe by covering the cut end of the pipe.
Is coated.

[0005] In order to solve the above-mentioned problems, a pipe cutting device according to the present invention enables a pair of cases to be opened and closed.
Te, detachably attached to the outer peripheral surface of the pipe, and a box for shielding so as to divide the circumference of the pipe from the outside, is connected to the box, the suction processing means for sucking the inside the box, provided in the box And a pressurizing and cutting means for pressurizing and cutting the pipe, and a covering means provided in the box for covering a cut end of the pipe.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a pipe cutting method and apparatus according to the present invention will be described with reference to FIGS. 1 is a schematic explanatory diagram of the method, FIG. 2 is a schematic diagram illustrating the relationship between the device and piping, FIG. 3 is a cross-sectional view illustrating a schematic structure of the device, and FIG. 4 is a plan view of FIG. , FIG.
FIG. 4 is an explanatory view of a procedure of a pipe cutting method using the apparatus of FIG.

As shown in FIG. 1, a pipe 100 into which a thermocouple 101 or the like has been inserted is crimped, the crimped portion 100a is cut to remove a cut piece 100b, and the cut ends 100c and 100d of the pipe 100 are removed. The cap 102 is attached with an adhesive such as an epoxy resin, and the cut end 100c,
The coating of 100 d prevents the radioactive substance from leaking or scattering from inside the pipe 100.

In such a series of operations, the piping 10
Since the thermocouple 101 is inserted into the inside of the pipe 100 when crimping the pipe 100, it is difficult to completely adhere the inner surface of the pipe 100 as described above.
0 of the crimping portion 100a and cut end portions 100c, 10c.
Until the cap 102 is attached to 0d, the radioactive substance may leak or scatter from the cut ends 100c and 100d.

Therefore, as shown in FIG. 2, the periphery of the pipe 100 is covered with a box 1 which shields the outside and the inside so as to separate the inside from the outside, and the pipe is connected via a suction hose 20 and a predetermined exhaust treatment device by a suction pump (not shown). By performing the above-described operation while sucking the surroundings of the 100, the radioactive substance is prevented from leaking out and scattering.

Next, a pipe cutting apparatus used for carrying out the above-described pipe cutting method will be described. As shown in FIGS. 3 and 4, the box 1 includes a pair of cases 1a and 1b, and one side surface is rotatably connected via a pair of hinges 1c. A base end of an air cylinder 2 serving as a box opening / closing means is rotatably connected to an outer side surface of the case 1a on the hinge 1c side. Rod 2 of air cylinder 2
The distal end of a is connected and fixed to the outer surface on the hinge 1c side of the case 1b via the opening / closing plate 3. That is, by extending the rod 2a of the air cylinder 2, the case 1a and the case 1b can be pivoted about the hinge 1c so as to separate the case 1a from the case 1b, that is, the box 1 can be opened.
By contracting the rod 2a, the case 1a and the case 1b can be pivoted about the hinge 1c so as to be close to each other, that is, the box 1 can be closed.

As shown in FIGS. 3 and 4, cases 1a and 1b
Above and below the peripheral edge facing the
Are formed so as to form a pair, respectively. A sealing material 4 such as a sponge is provided on the peripheral edge portions of the cases 1a and 1b and the grooves 1d and 1e. In the vicinity of the groove 1d above and below the outer surface of the case 1a, clamp devices 5 which are pipe gripping means for sandwiching the pipe 100 are provided, and the clamp device 5 includes an air cylinder 5a.
, The pipe 100 can be clamped.

As shown in FIGS. 3 and 4, a screw shaft 6 whose axis is oriented in a direction penetrating the grooves 1d and 1e is rotatably supported near the hinge 1c in the case 1a. . In the vicinity of the screw shaft 6, a guide shaft 7 oriented in the axial direction along the axial direction of the screw shaft 6 is provided so as to form a pair with the screw shaft 6 interposed therebetween. A slide block 8 penetrates the guide shaft 7 so as to be slidable along the guide shaft 7, and the slide block 8 is screwed to the screw shaft 6. The upper end of the screw shaft 6 is connected to an electric motor 9 with an encoder provided on the outer upper surface of the case 1a. That is, when the electric motor 9 is operated to rotate the screw shaft 6, the slide block 8 slides along the guide shaft 7.

As shown in FIGS. 3 and 4, on the surface of the slide block 8 on the side of the grooves 1d and 1e, the slide block 8 slides along a direction perpendicular to the slide movement direction of the slide block 8. A possible slide table 10 is provided. The surface of the slide table 10 on the side of the grooves 1d and 1e is connected to the pipe 10
A hydraulic or electric crimping and cutting device 11 for crimping 0 and cutting with a cutter 11b is attached. The crimping and cutting device 11 includes a bucket 11c that takes in a cut piece 100b of the cut pipe 100.

In the present embodiment, the screw shaft 6, the guide shaft 7, the slide block 8, the electric motor 9, the slide table 10, the pressure cutting device 11, and the like constitute a pressure cutting device.

As shown in FIGS. 3 and 4, a portion of the case 1a opposed to the screw shaft 6 with the grooves 1d and 1e interposed therebetween has a screw shaft oriented axially along the screw shaft 6. 12
Are rotatably supported. In the vicinity of the screw shaft 12,
A guide shaft 13 oriented in the axial direction along the axis of the screw shaft 12 is provided so as to form a pair with the screw shaft 12 interposed therebetween. The guide block 13 has a slide block 1
4 penetrates so as to be slidable along the guide shaft 13, and the slide block 14 is screwed to the screw shaft 12. The upper end of the screw shaft 12 is connected to an electric motor 15 with an encoder provided on the outer upper surface of the case 1a. That is, when the electric motor 15 is operated to rotate the screw shaft 12, the slide block 1
4 slides along the guide shaft 13.

As shown in FIGS. 3 and 4, on the surface of the slide block 14 on the side of the grooves 1d and 1e, there is provided a turning shaft 16 which can turn along the surface. A base end of an extendable telescopic rod 17 is attached to an axial center portion of the turning shaft 16. A slide table 18 that is slidable in a direction orthogonal to the slide movement direction of the slide block 14 is provided at the tip of the telescopic rod 17. A hand 19 for attaching a cap 102 to the cut end of the pipe 100 is provided on a surface of the slide table 18 on the side of the grooves 1d and 1e.
A strip heater (not shown) for heating an adhesive made of epoxy resin or the like in the cap 102 is incorporated.

In this embodiment, the screw shaft 12, the guide shaft 13, the slide block 14, the electric motor 15,
Pivot shaft 16, telescopic rod 17, slide table 18,
The covering means is constituted by the hand 19 and the like.

As shown in FIGS. 3 and 4, one end of a suction hose 20 is connected to the upper portion of the case 1a. The other end of the suction hose 20 is connected to a suction pump (not shown) via a predetermined exhaust treatment device. In the present embodiment, the suction hose 20, the exhaust processing device, the suction pump, and the like constitute a suction processing unit.

Also, as shown in FIGS.
Is connected to a top of a manipulator 21 which is a box positioning support means for moving the box 1 while supporting it.

A pipe cutting method using such a pipe cutting device will be described below. The box 1 is opened by extending the rod 2a of the air cylinder 2 and the manipulator 2 is opened.
1 to move the box 1 to a predetermined position of the pipe 100, and to insert the pipe 100 into the grooves 1d and 1e of the cases 1a and 1b.
Is fitted, the rod 2 a of the air cylinder 2 is contracted to close the box 1, and the box 1 is fixed to the pipe 100 by gripping the pipe 100 with the clamp device 5.

Next, when suction in the box 1 is started by the suction pump through the suction hose 20 and the exhaust processing device, the electric motor 9 is operated to operate the slide block 8.
To the predetermined location side of the pipe 100,
Slide the slide table 10 to move the pipe 100
Of the pipe 100
After the above-mentioned portion is press-bonded with the mold 11a (see FIG. 5), it is cut with the cutter 11b, and the cut piece 100b of the pipe 100 is taken into the bucket portion 11c (see FIG. 6).

Subsequently, the slide table 10 is slid and the electric motor 9 is operated to move the slide block 8, so that the crimping and cutting apparatus 11 is connected to the pipe 10
0, the slide block 14 is moved to the cut end 10 of the pipe 100 by operating the electric motor 15.
0c (see FIG. 7), and the hand 19 is moved by the extension of the telescopic rod 17 and the sliding movement of the slide table 18 to the cut end 100 of the pipe 100.
c (see FIG. 8), the cap 102 gripped by the hand 19 is placed on the cut end 100c, and the strip heater is energized to melt the adhesive in the cap 102 and cut the cap 102 and the cut. End 10
0c.

When the cap 102 is put on the cut end 100c, the telescopic rod 17 and the slide table 18
Is operated to separate the hand 19 from the cutting end 100c, and then the turning shaft 16 is turned to turn the hand 19, and the telescopic rod 17 and the slide table 18 are operated to connect the hand 19 to the cutting end of the pipe 100. Then, the cap 102 held by the hand 19 is attached to the cut end 100d in the same manner as described above.

Thus, the cut end 10 of the pipe 100 is
After putting caps 102 on 0c and 100d respectively,
The telescopic rod 17 and the slide table 18 are operated, and the electric motor 15 is operated to operate the slide block 14.
The hand 19 is connected to the pipe 10 by sliding
0, the suction pump is stopped, and the suction in the box 1 is stopped. Then, the clamp device 5 is released to open the pipe 100 from the clamp device 5, and the rod 2a of the air cylinder 2 is removed. The box 1 is extended and the box 1 is opened.
By operating the manipulator 21 so as to remove the box 00 and retract the box 1, the processing of the piping 100 is completed.

That is, the box 1 whose inside is sucked
The crimping and cutting work of the pipe 100 is performed in the inside, and the cap 10 is attached to the cut ends 100c and 100d of the pipe 100.
2 was put on.

For this reason, even if the radioactive substance leaks from the cut ends 100c and 100d of the pipe 100 when the pipe 100 is cut, the box 1 traps the radioactive substance inside, and the suction pump 1, the radioactive substance in the pipe 1 is suctioned and processed by the processing apparatus, and the cap 102 is connected to the cut ends 100c and 100
d to prevent radioactive material from leaking out.
It does not leak or scatter radioactive materials inside.

Therefore, the thermocouple 1 is provided inside the pipe 100.
Even if 01 or the like is inserted and the inner surface of the pipe 100 cannot be completely adhered, it is possible to reliably prevent the radioactive substance in the pipe 100 from leaking or scattering to the outside.

[0028]

According to the pipe cutting method of the present invention, the periphery of the pipe is shielded so as to be partitioned from the outside, and while the periphery of the pipe is sucked, the pipe is crimped and cut, and then the cut end of the pipe is cut. Therefore, even when the inner surface of the pipe cannot be completely adhered, it is possible to prevent the substance in the pipe from leaking or scattering to the outside.

In the pipe cutting apparatus according to the present invention, a box detachably mounted on the outer peripheral surface of the pipe and shielding the circumference of the pipe so as to partition the periphery from the outside, and a suction pipe connected to the box and suctioning the inside of the box. Processing means;
It is provided in the box, and is provided with a pressurizing and cutting means for pressing and cutting the pipe, and a coating means provided in the box and for covering a cut end of the pipe. Even if crimping the pipe, the inner surface of the pipe cannot be completely adhered, and even if the pipe is cut by the crimping cutting means and the substance leaks or scatters from the cut end of the pipe, The substance is confined inside, and the suction processing means sucks and processes the substance in the box,
Since the covering means prevents the substance from leaking or scattering from the cut end of the pipe, it is possible to prevent the substance inside the pipe from leaking or scattering to the outside.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of an embodiment of a pipe cutting method according to the present invention.

FIG. 2 is an explanatory diagram of a positional relationship with a pipe of the embodiment of the pipe cutting device according to the present invention.

FIG. 3 is a sectional view showing a schematic structure of an embodiment of a pipe cutting device according to the present invention.

FIG. 4 is a plan view of FIG. 3;

5 is an explanatory view of a procedure of a pipe cutting method using the apparatus of FIG.

FIG. 6 is an explanatory diagram of a procedure following FIG. 5;

FIG. 7 is an explanatory diagram of the procedure following FIG. 6;

FIG. 8 is an explanatory view of the procedure following FIG. 7;

FIG. 9 is an explanatory view of the procedure following FIG. 8;

FIG. 10 is an explanatory view of a crimping operation of a conventional pipe cutting method.

FIG. 11 is an explanatory view of a cutting operation of a conventional pipe cutting method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Box 1a, 1b Case 1c Hinge 1d, 1e Groove 2 Air cylinder 2a Rod 3 Opening / closing plate 4 Seal material 5 Clamping device 5a Air cylinder 6 Screw shaft 7 Guide shaft 8 Slide block 9 Electric motor 10 Slide table 11 Crimping and cutting device 11a Gold Mold 11b Cutter 11c Bucket part 12 Screw shaft 13 Guide shaft 14 Slide block 15 Electric motor 16 Revolving shaft 17 Telescopic rod 18 Slide table 19 Hand 20 Suction hose 21 Manipulator 100 Piping 100a Crimping part 100b Cut piece 100c, 100d Cutting end 101 Heat Transfer 102 cap

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-253497 (JP, A) JP-A-56-121000 (JP, A) Toshio Yada Outside, plasma cutting equipment in water, piping technology, Japan, Nippon Kogyo, August 1, 1981, VOL. 23 / NO. 9, 110-114, 131-132 (58) Fields surveyed (Int. Cl. ⁷ , DB name) G21F 9/30 531 JICST file (JOIS)

Claims (3)

(57) [Claims] 1. A box capable of opening and closing a pair of cases.
Shields the surroundings of the pipes from outside,
A method for cutting a pipe, comprising cutting the pipe by crimping the pipe while sucking the inside of the box, and then covering the cut end of the pipe. 2. The cut end of the pipe according to claim 1, wherein a cap containing an adhesive therein is provided.
Covering the cut end by covering the cut end.
Piping cutting method. (3) Piping is made possible by opening and closing the pair of cases.
It is detachably attached to the outer peripheral surface of
A box that shields you from the outside, A suction box connected to the box and sucking the inside of the box;
Attraction processing means; It is provided in the box and cuts the pipe by crimping
Pressure cutting means, Provided in the box, covering the cut end of the pipe
Coating means and Pipe cutting characterized by comprising
apparatus.