JPS6249253A - Positioning of traveling body in pipe for inspecting weld part - Google Patents

Abstract

PURPOSE:To enable highly accurate positioning, by positioning a traveling body in a pipe with respect to a weld part based on the position of a weld part image on a monitor screen. CONSTITUTION:When carrying out a radiation transmission test for a weld part 3 of a pipe 20, after a photosensitive film 60 is arranged on the circumference of the weld part 30, caterpillars 11L and 11R are operated to advance a traveling body 10. With the running of the traveling body 10, an image 30' of the weld part 30 appears below a monitor image 40 as the weld part 30 enters the view of a camera 15. With the further advance of the traveling body 10, the image 30 of the weld part approaches an indicator 50 and finally, overlap. At this point, as a concave part 14a of a collimator 14 coincides with the position of the weld part 30, the running of the traveling body 10 is stopped by an operator to complete the positioning of the traveling body 10 with the weld part 30. Thus, the positioning of the traveling body 10 with the weld part 30 can be performed simply and at a high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for positioning a welded part of a metal tube running body for welded part inspection.

[Conventional technology]

The pipe running body inspects the welded parts of pipes using radiation, ultrasound, etc., and uses radiation sources and ultrasound! In order to position the lobes, etc. at the weld, it is necessary to perform their own positioning.

Therefore, conventionally, the moving position of the running body is determined from the length of the wire connected to the running body I-7, and based on this moving position and the previously known position 1N of the welding part, the above-mentioned I try to do all the positioning of the traveling body.

[Problem that the invention seeks to solve]

However, in the above positioning method, the length of one wire that is fed out does not necessarily accurately represent the moving position # of the traveling body due to the slack of the wire, bending of the tube, etc. This is difficult. For this reason, the position of the radiation source, ultrasonic beam, etc. relative to the welded portion may be inaccurate, making it impossible to obtain highly reliable inspection results. This conventional method also has the inconvenience of having to measure the position of each weld on the pipe in advance.

SUMMARY OF THE INVENTION In view of these conventional problems, it is an object of the present invention to provide a method that can easily and precisely position the welded part of a metal tube for a notebook running body at an angle of 8 degrees.

[Failure to solve the problem]

In the present invention, an imaging means is used from an in-pipe traveling body for welding part inspection, and the position of the welded part image on the IJ monitor screen is measured with respect to the index set on the t-172 screen for all the bath contact parts of the pipe. The in-pipe traveling body is positioned with respect to the welded portion.

〔Example〕

Embodiments of the present invention will be explained below with reference to the 5 drawings. 1. Figures 1 and 2 show the structure of the side and front surfaces of a pipe running body for inspecting welded parts to which the positioning method of the present invention is applied. ing.

This traveling body 10 is equipped with crawler tracks III and 111R formed of rubber or the like on the left and right lower sides. These tracks 11
L and 11R are arranged at an appropriate angle of inclination so that their outer surfaces are in sufficient contact with the inner circumferential surface of the tube 20, which is the test object, and between them there is a weight 12 ( For example, 30 kg) is installed.

``Furthermore, a radiation source transfer pipe 13 for passing a radiation source to be described later is provided above the traveling body 1O. The longitudinal axes of the BA source transfer pipes 13t, 1, and t of C are within the test area;
2J remeter 14 is attached to the front flame of J2.

The collimator 14Y has the function of keeping the radiation from the radiation source within a protected solid angle, and this function is achieved by the four parts 14a made of a radiation transparent material such as aluminum.

A Brevi camera 15 is disposed on the L side of the radiation source transfer tube 13. These 15 television cameras have a means for determining the IM of the traveling body 10, as will be described later.
・l is used, and in this example, the upper front of the traveling body 10 is placed within the field of celebration. (=J angle is rounded.

The principle of this invention will now be clarified.

As shown in FIG.
0 is displayed on both sides 40 of the 72 vertical T/V as shown in FIG. 3(a).

Therefore, if an image as shown in the figure (&) is displayed as an index 50 on the monitor screen 40 in advance,
When the image of the actual welded part and the image of the actual welded part overlap on the monitor screen 40-[2, the traveling body IO is shown in FIG.
It can be determined that # is reached. In addition, (change in the position of the image of the welded part on the soil screen) and the traveling body 1
If the correlation with the moving salmon of 0 is determined, the position of the traveling body 10 with respect to the welding part 30 can be known by reading the distance of the welding part image, which is used as a reference for all indicators 50, on the 72-tap screen, and this This makes it possible to stop the traveling body 10 at a desired position relative to the -C weld 30.

The principle of the present invention is as follows.

In order to set the index 50 f7y, in this embodiment, an image as shown in FIG. 3(a)K is captured in advance using the same tube as the tube 20, and this image is stored in the stroke memory .

Next, a complete explanation will be given of the embodiment of the present invention in the case where all radiographic examinations are carried out.

Radiation 1 of the welding part 30 of the above ¥t20 iM1
.

11R is activated and the traveling body 10 travels forward.

When the welding part 3 () enters the 4M field of the camera 15 as the traveling body 10 travels, an image 30' of the welding part 3 () appears at the bottom of the monitor screen 40, as shown in FIG. 3(b). .

Then, as the traveling body 1 (l) advances further, the welded part (3:to') approaches the index 50 as shown in FIG.

At this time, as shown in FIG. 1, the four parts 14& of the C collimator 14 match the position of the welding part 30 [-2], so the operator tc tells the operator tc to stop the traveling body 1o.
Then, the positioning of the traveling body 10 with respect to the welding part 30 is completed.

In this embodiment 1/r, a non-['1 running body 8o as shown in l:J striking body 1o1]4vj is towed.

This traveling body 80 is equipped with a cell 81 that houses a radiation source such as irizium, and the (7) traveling body 80 is located between the cell 81 and the rear end of the source transfer pipe I3. It receives the tractive force of the traveling body 1o via the flexible tube 70 interposed therebetween.

When the positioning of the traveling body 1o with respect to the welding part 30 is completed, the radiation source in the casselle 81 is moved to the flexible tube 7 by means of a displacement device [82] installed on the side of the casselle 81.
0 (r is fed into the transfer tube 13, and this wire d is located within the collimator) 4.

The radiation source moving device 81 is equipped with means for pumping the radiation source with pressurized air, and the high-H air is supplied from the outside of the pipe 2o through a pipe (not shown). I can do it.゛Also, confirmation 1.1 that the radiation source is located within the collimator 14 is performed by a switch provided within the collimator 14, a mitswitch, or the like.

The l/Ms radiation positioned V1 within the collimator 14 is
The light passes through the four parts 14 of this collimator 14 and passes through the welded part 30 and its surroundings. Therefore, if a defect exists in the weld 6, this defect will be photographed on the film 60.

The radiation source moving device 82a also has the function of moving the radiation source in the collimator 14 into the capsule 81 using high-pressure air, and the radiation source is moved when the photographing with the film is completed. This source delivery device 82 is activated so that the source is returned into the cell 81 .

Note that the tube 20 has welded portions at predetermined intervals, and the traveling body 10 is positioned at these welded portions in the same manner as described above.

In the above embodiment, the index 50 is displayed on the monitor screen using data stored in the l1fjj image memory.
Of course, a mark of the same shape may be formed at the same position as the display position of the indicator 50, and this may function as an indicator.

Furthermore, in the above embodiment, the operator positions the traveling body 1o while looking at the monitor screen, but the welding line image 3
Of course, it is also possible to electrically detect that 0' has reached the position of the index 50 or a predetermined point 67 based on the index 50, and automatically stop the traveling body 1o. .

In addition, in the embodiment, it is possible to use a device @82 that moves the lfM source using pressurized air, or a source moving device that moves the source by winding the release wire with a motor and then rewinding it. It is.

The present invention can be effectively applied to the case where the welded portion 30 is subjected to ultrasonic flaw detection from inside the pipe 20. Furthermore, it can naturally be applied to the positioning of a non-self-propelled traveling body that is pulled by a wire or the like.

〔Effect of the invention〕

As is clear from the above-mentioned embodiment, according to the present invention, it is possible to visually detect the attachment of the welded part inspection pipe running body to the welded part on the monitor screen. It is possible to easily and precisely position fn with respect to the welded portion of the traveling body.

[Brief explanation of the drawing]

1 and 2 are a side view and a front view, respectively, showing the structure and regular operation mode of a pipe running body for inspecting welded parts to which the method according to the invention is applied, and FIG. 3 is a side view and a front view, respectively. FIG. 4 is a conceptual diagram showing a state in which a traveling body on which a radiation source storage case cell is mounted is being towed by a self-propelled traveling body. 10.18... Traveling body, 11 L, 11 R...
・Crawler track,] 3... Source transfer tube, 14... Collimator % 15... Television camera, 20... Tube to be inspected, 3
0... Welding part, 40... Monitor 11 screen, 50...
Index, 60...Film, 70...Flexible tube. Figure 3

Claims (1)

[Claims] The welded part of the pipe is captured by an imaging means from the pipe running body for welding part inspection, and the position of the pipe running body with respect to the welded part is determined based on the position of the welded part image on the monitor screen with respect to the index set on the monitor device. A method for positioning an in-pipe running body for inspecting a welded part.