JPH08233564A - Traveling position detecting device for pig - Google Patents

Abstract

PURPOSE: To specify the traveling position of a pig by collating the data related to passage sound of a pig passing through a conduit tube with completed data. CONSTITUTION: A launcher 12 of a conduit tube 11 is provided with an acceleration sensor 13 which senses the passage sound of a pig 10. At a traveling position detecting device 14, noise component is removed, and only the sound pressure data related to the passage sound is extracted out of the data in the acceleration sensor 13 related to the passage sound, by a band pass filter 15. By a passage decision means 16, a reference value of sound pressure data related to the passage sound stored in advance is compared with the sound data extracted, and, when the level of sound pressure data is above the reference value, the decision signal which indicates that the pig 10 passed over the weld line M is outputted, and, at a traveling position specification means 18, the signal related to this decision is collated with a completed data storage means 17, so that the traveling position of the pig 10 is specified. The position of the pig is precisely recognized, done with no worker, and improvement is obtained in various work progress.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention is directed to the inlet side of a conduit pig,
Alternatively, the running position of the pig can be determined by collating the data concerning the passing sound of the pig passing through the welding point in the conduit, which is captured at the exit side, with the ready-made data in which the welding position data of the conduit is recorded in advance. The present invention relates to a pig traveling position detection device that is specified.

[0002]

2. Description of the Related Art For example, a pig adapted to run in a conduit laid in the ground has an inspection pig for inspecting for defects such as corrosion thinning, a cleaning pig for cleaning the inside of the conduit, and There is a caliper pig for inspecting the shape of the inner surface of the conduit.

[0003] When the above-described pig runs in a conduit, it is often convenient for the work progress if it is always known which position of the conduit the pig is running. Among the conduits for running the pig, for example, a gas pipe made of steel pipe is joined by welding, and therefore, the sound generated when the pig 1 passes through the welding line M is detected, so that the pig 1 I try to understand the position of. The sound generated when the pig 1 passes through the welding line M is an impact sound generated when the pig 1 passes through a welding portion having an inner diameter narrower over the entire circumference of the pipe wall than other portions. The sound passing through the pig 1 can be picked up by the sounding device R by attaching the sounding device R to the sinking rod 3 provided at a proper position so as to contact the buried conduit 2 from the ground surface (see FIG. 4). ).

[0004]

However, in the method as described above, it is necessary to perform measurement at many points, and the operator must pick up the passing sound of the pig 1 with the aid of a hearing aid. Is difficult to identify, the measurer must move in accordance with the passage of the pig 1, or a plurality of measurers are required. The present invention has been made in order to improve such inconvenience, and collects data concerning the passing sound of a pig passing through a welding point in a conduit, which is captured on the introduction side or the exit side of the pig of the conduit. An object of the present invention is to provide a pig traveling position detection device which specifies a traveling position of a pig by collating welding welding position data of a conduit with pre-made data.

[0005]

In order to solve the above-mentioned problems, the present invention provides a pipe introducing means for introducing a pig into a pipe in a pipe joined by welding at predetermined intervals or after running. The pig collecting means for collecting the pig is provided with an acoustic listening means for capturing the sound generated when the pig passes through the welding point through the pipe wall when the pig runs in the conduit, and the passing sound captured by the acoustic listening means. Bandwidth filter for extracting a predetermined signal from the data related to the above, based on the extracted signal, the welding location passage determining means that the pig has passed the welding location, and the signal regarding the determination by the welding location passage determining means And the running position specifying means for specifying the running position of the pig by collating with the ready-made data recording means in which the welded portion of the conduit is recorded in advance. In the above-described configuration, the pipe introducing means or the pig collecting means is provided with an acoustic listening means for capturing a passing sound of the pig passing through the welding portion. Further, the welding point passage judging means is characterized in that the pig passes through the welding point when the signal extracted by the bandpass filter exceeds a predetermined level. Further, the welding point passage determining means is configured to determine that the pig has passed the welding point when the rise time of the signal extracted by the bandpass filter is within a predetermined time. Further, the welding point passage determining means, when the signal extracted by the bandpass filter is approximated by comparing with the sound pressure data applied to the passing sound when passing through the welding point stored in advance, the pig detects the welding point. It is characterized in that it is configured to pass.

[0006]

When the pig is introduced into the conduit for traveling, the sound produced when the pig passes through the welding point is captured through the pipe wall by the acoustic listening means provided on the pipe introducing means or the pig collecting means side. From the data on the passing sound captured by the acoustic listening means, only the sound pressure data on the passing sound is extracted, and based on this extracted signal, it is determined that the pig has passed the welding point. The signal is compared with collated data in which the welded portion of the conduit is recorded in advance to identify the traveling position of the pig.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pig running position detecting device according to the present invention will be described in detail below with reference to an embodiment. FIG. 1 shows the pig 10 running in a conduit 11 buried in the ground. When the pig 10 travels in the conduit 11, the traveling position can be specified by a traveling position detecting device described later. The pig 10 is sized so as to be slidable in correspondence with the inner diameter of the conduit 11, and is guided into the conduit 11 from a launcher 12, which is an in-pipe introducing means of the pig 10, provided at one end of the conduit 11. The configuration is such that the fluid travels in the conduit 11 by the pressure of the fluid (for example, high-pressure gas) flowing in the conduit 11.

The conduit 11 is a steel pipe, and at the time of laying work, a welding line M is formed by joining predetermined portions by welding in accordance with the finished drawing. The welding line M is
The molten metal on the inner surface of the conduit 11 rises over the entire circumference of the pipe wall, and the inner diameter is smaller than that of other locations.

Further, the launcher 12 of the conduit 11 is provided with an acoustic listening means, that is, an acceleration sensor 13, for catching a sound generated when the pig 10 passes through the welding line M in the conduit 11 through the pipe wall. . Then, the data concerning the passing sound captured by the acceleration sensor 13 is transferred to the traveling position detecting device 14 to detect the position of the pig 10. In addition, the launcher 12 of the conduit 11
In addition to the acceleration sensor 13 provided on the outer wall, an acoustic listening means (not shown) is provided in the launcher 12, and a sounding device (hydrophone microphone) is provided to allow the pig 10 to pass through the high pressure gas flowing in the conduit 11. Can also be configured to capture the passing sound that passes through the welding line M.

The traveling position detecting device 14 includes a bandpass filter 15 for extracting only sound pressure data concerning the passing sound from the data concerning the passing sound captured by the acceleration sensor 13, that is, a bandpass filter 15, and the extracted passing sound. Based on the sound pressure data applied to the sound, the pig 10 welds the welding line M.
Passage determining means 16 that has passed through, the work type data recording means 17 in which the position information of the welding line M of the conduit 11 is recorded in advance, the signal related to the determination by the passage determining means 16 and the work type data recording means. It is provided with a traveling position specifying means 18 which collates with 17 and specifies the traveling position of the pig 10.

The bandpass filter 15 includes a conduit 11
The low-frequency component and the high-frequency component are removed from the data concerning the passing sound captured by the acceleration sensor 13 in the launcher 12, that is, the data including the noise component (see FIG. 2), and the sound pressure data concerning the passing sound (see FIG. 3)) is taken out, and a well-known configuration can be applied.

The passage determining means 16 stores, as a reference value, a voltage value corresponding to a level appearing in sound pressure data applied to a passing sound generated when the pig 10 passes through the welding line M, and the reference value is stored. And the sound pressure data applied to the extracted passing sound are compared, and when the level of the sound pressure data exceeds the reference value, a determination signal that the pig 10 has passed the welding line M is output. . Also, the passage determination means 1
6 shows the rising time required to reach a predetermined sound pressure level from the sound pressure data applied to the extracted passing sound. If the rising time is within a predetermined range, the pig 10 has passed the welding line M. It may be configured to output a determination signal that Further, the passage determination means 16 stores, as a standard pattern, sound pressure data applied to the passing sound generated when the pig 10 passes through the welding line M, and the sound pressure data applied to the standard pattern and the extracted passing sound. If the patterns of the sound pressure data are similar to each other, the determination signal indicating that the pig 10 has passed the welding line M may be output.

Then, the traveling position specifying means 18 counts, for example, a signal relating to the judgment from the passage judging means 16, that is, the number of times the pig 10 has passed the welding line M, and the number of passing times is counted. A signal is sent to the ready-made data recording means 17 and position information data matching the signal is taken out, for example, a display (not shown) in which the ready-made drawing is shown and blinking display is made. can do.

The traveling position detecting device for a pig according to the present invention is constructed as described above, and its operation will be described below. When the pig 10 is introduced into the conduit 11 to run, the acceleration sensor 13 provided on the launcher 12 side can capture the passing sound generated when the pig 10 passes the welding line M through the pipe wall.

The sound pressure data of the passing sound captured by the acceleration sensor 13 includes a noise component, and when transferred to the traveling position detecting device 14, the bandpass filter 15 causes a low frequency component and a high frequency component. A process of removing the component and extracting only the sound pressure data applied to the passing sound is performed.

Next, the passage determining means 16 determines the reference value (voltage value) corresponding to the level of the sound pressure data applied to the passing sound at the welding line M of the pig 10, which is stored in advance, and the extracted passing sound. By comparing with the sound pressure data, when the level of the sound pressure data exceeds the reference value, it is possible to output a determination signal that the pig 10 has passed the welding line M.

Then, the traveling position specifying means 18 counts the signals related to the judgment from the passage judging means 16 and compares the count signal with the ready-made data recording means 17 to extract the matching position information data. Then, by blinking this position information data on the display in which the production pattern is shown, the current position of the pig 10 can be easily known.

The operation of the pig running position detecting apparatus according to the present invention has been described above based on an example of the above-mentioned control configuration, but the other control configurations already shown may also be used.
Since the same effect can be achieved, the description thereof will be omitted.

[0019]

As described above, according to the present invention, the data concerning the passing sound of the pig passing through the welding portion in the conduit, which is captured on the inlet side or the outlet side of the pig of the conduit, is stored in advance at the welding portion of the conduit. Since the running position of the pig is specified by collating it with the recorded workable data, it is possible to accurately recognize the position of the pig without requiring skill, and it is possible to perform various operations without manpower. Can contribute to the improvement of the work progress.

[0020]

[Brief description of drawings]

FIG. 1 is a schematic overall configuration explanatory view showing one configuration example of a pig traveling position detection device according to the present invention.

FIG. 2 is a waveform graph showing an example of sound pressure data applied to a passing sound captured by an acoustic listening means provided on the side of the conduit introducing means of the conduit shown in FIG.

FIG. 3 is a waveform graph showing an example of the sound pressure data of the passing sound after the sound pressure data of the passing sound captured by the acoustic listening means shown in FIG. 2 is extracted by the bandpass filter of the traveling position detecting device. Is.

FIG. 4 is a schematic explanatory view showing an example of conventional means for grasping a traveling position of a pig traveling in a conduit.

[Explanation of symbols]

10 Pig 11 Conduit 12 Launcher 13 Accelerometer 14 Travel Position Detection Device 15 Band Pass Filter 16 Passage Determination Means 17 Ready-made Data Recording Means 18 Travel Position Identification Means M Welding Line

Claims (5)

[Claims] 1. A pipe in which pipes are joined at predetermined intervals by welding, the pipe introducing means for introducing the pig into the pipe, or the pig collecting means for collecting the pig after traveling,
When the pig runs through the pipe, acoustic listening means is provided to capture the sound generated when the pig passes through the welded portion through the pipe wall, and the passing sound is determined from the data of the passing sound captured by the acoustic listening means. A bandpass filter that extracts only the sound pressure data, a welding point passage determination means that the pig has passed the welding point based on the extracted signal, a signal related to the determination by the welding point passage determination means, and a conduit in advance. And a traveling position specifying means for specifying a traveling position of the pig by collating it with a ready-made data recording means for recording the welding position of the pig. 2. The traveling position detecting device for a pig according to claim 1, wherein an acoustic listening means for capturing a passing sound of the pig passing through a welding portion is provided in the pipe introducing means or the pig collecting means. 3. The welding point passage determining means is configured to determine that the pig has passed the welding point when the signal extracted by the bandpass filter exceeds a predetermined level. The running position detection device for the pig described. 4. The welding point passage determining means is configured to determine that the pig has passed the welding point when the rise time of the signal extracted by the bandpass filter is within a predetermined time. Item 1. A pig traveling position detection device according to item 1. 5. The welding point passage determining means determines that a signal extracted by a bandpass filter is compared with sound pressure data applied to a passing sound when passing through a welding point stored in advance and is approximated by a pig. The traveling position detecting device for a pig according to claim 1, wherein the traveling position detecting device is configured to pass through a welded portion.