JPH0625755U - Passage mechanism of in-pipe inspection device - Google Patents

Abstract

(57) [Summary] [Purpose] To allow a passage mechanism of an in-pipe inspection device such as a gas pipe to easily pass through a curved pipe portion of a small diameter pipe. A tip guide provided at the tip, a spring member having one end fixed to the tip guide and the other end fixed to the tip of the in-pipe inspection device, and an intermediate guide member disposed between the spring members. And a wire whose one end is attached to the tip guide and is laid along the spring member, and when a pulling force in a direction opposite to the tip guide is applied to the wire, the intermediate portion of the spring member is provided. A passage mechanism for an in-pipe inspection device, characterized in that a tip side portion of the guide member is bent.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a passage mechanism for an in-pipe inspection device such as a gas pipe, and more particularly to a passage mechanism for an in-pipe inspection device that can easily pass through a curved pipe portion of a small diameter pipe.

[0002]

[Prior art]

 Conventionally, there is a separated eddy current flaw detection method that detects the degree of corrosion of a gas pipe or the like by electromagnetic waves. As a method for this isolated eddy current flaw detection, for pipes with a medium diameter (50-80 mmφ) or more, a method has been developed and put into practical use, in which only straight pipes or pipes containing smooth curved pipes with no expansion / contraction are developed. Has been done. FIG. 7: is a front view which shows the passage mechanism of the conventional in-pipe inspection apparatus for small diameter pipes. In FIG. 7, a passage mechanism E is attached to the reception sensor 95 at the tip of the in-pipe inspection apparatus D. The passage mechanism E includes a tip guide 91, a tip spring 92, and a centering guide 93. One end of the tip spring 92 is fixed to the tip guide 91, and the other end is fixed to the reception sensor 95. The tip spring 92 is capable of flexing in response to bending inside the tube. Further, a centering guide 93 is attached to the tip spring 92 in order to hold the tip spring 92 and the tip side reception sensor 95 on the substantially central axis of the pipe. The in-pipe inspection device D has a transmission sensor 94 and a pair of reception sensors 95, and these respective sensors are connected in a line by relay springs 96, 97, and 98, so that the transmission sensor 94 and the pair of reception sensors 95 are almost in the pipe. A centering guide 93 is mounted on the relay springs 96 and 97 for holding the centering shaft on the center axis. With the above configuration, in a small-diameter pipe of 20 to 32 mmφ, the passage mechanism E and the in-pipe inspection device D have the ability to pass two to three curved pipe portions (90 ° elbow, stell) and the like.

[0003]

[Problems to be solved by the device]

 However, in practice, when conducting in-pipe inspection of small diameter gas pipes with diameters of 15 mm or more, it is necessary to be able to pass through at least three or more curved pipe portions of the small diameter gas pipes with diameters of 15 mm or more. However, this is not possible with the above-mentioned conventional passage mechanism of the in-pipe inspection device. Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks and to provide a passage mechanism of an in-pipe inspection device which can freely pass a small diameter gas pipe of 15 mmφ or more having a large number of curved pipe portions.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the structure of the present invention comprises a tip guide provided at the tip, a spring member having one end fixed to the tip guide and the other end fixed to the tip of the in-pipe inspection device, and the spring. An intermediate guide member disposed in the middle of the member and a wire having one end attached to the tip guide and installed along the spring member are provided, and the wire has a pulling force in a direction opposite to the tip guide. Is a passage mechanism of the in-pipe inspection device, characterized in that a tip side portion of the spring member is bent from the intermediate guide member.

[0005]

[Action]

 In the passage mechanism of the in-pipe inspection device configured as described above, when the tip guide reaches the curved pipe portion in the pipe, the in-pipe inspection device is further pushed toward the curved pipe portion, and the tip guide is moved toward the curved pipe portion. Pressed. At this time, if a pulling force is applied to the wire in the direction opposite to the tip guide, the tip side part of the spring member bends from the intermediate guide member, so if the in-pipe inspection device is pushed further toward this bend pipe part, The guide is easily pushed into the curved tube section. Further, the portion of the spring member on the rear end side of the intermediate guide member and the intermediate guide member serve as a cushioning material between the portion of the spring member on the tip end side of the intermediate guide member and the tip of the in-pipe inspection device. In addition, the tip of the in-pipe inspection device is positioned substantially on the central axis in the pipe.

[0006]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of an embodiment of the present invention. Note that FIG. 1 is composed of (a) and (b), and the right end in the figure of (a) is connected to the left end in the figure of (b). FIG. 2 is an enlarged view of the portion of FIG. 1 and 2, there is the following as a passage mechanism B of the in-pipe inspection device A. The spring member 2 includes a tip spring 21 and a tip relay spring 22. The tip guide 1 is fixed to one end of the tip spring 21, and the other end of the tip spring 21 is fixed to an intermediate guide 4 as an intermediate guide member. The tip relay spring 22 has rigidity equal to or stronger than that of the tip spring 21, one end of the tip relay spring 22 is fixed to the intermediate guide 4, and the other end of the tip relay spring 22 is an in-pipe inspection device. It is fixed to the reception sensor 7 of A. The tip guide 1, the tip spring 21, the intermediate guide 4, the tip relay spring 22 and the reception sensor 7 are arranged substantially in line. Further, a centering guide 5 is attached to the tip relay spring 22 in order to keep the tip relay spring 22 substantially on the central axis of the inner wall C of the pipe. One end of the wire 31 is attached to the tip guide 1, and the wire 31 is installed along the tip spring 21 and the tip relay spring 22. The wire 31 is slidably held by a pair of rings 32 attached to the intermediate guide 4 and the tip relay spring 22 and a hole (not shown) of the centering guide 5, and the other end of the wire 31 is connected to the reception sensor 7. It extends to the rear end (not shown) of the in-pipe inspection device A that it has. The tip spring 21 is configured to bend when a tensile force is applied to the wire 31 in the opposite direction to the tip guide 1. The relay spring 81 has one end fixed to the reception sensor 7 and the other end fixed to the transmission sensor 6. The centering guide 5 is attached to the relay spring 81. The rigidity of the relay spring 81 is stronger than the rigidity of the tip relay spring 22. Further, the relay spring 82 has one end fixed to the transmission sensor 6 and the other end fixed to the reception sensor 7. The centering guide 5 is also mounted on the relay spring 82. The rigidity of the relay spring 82 is stronger than that of the relay spring 81. The relay spring 83 has one end fixed to the reception sensor 7 and the other end fixed to the connecting portion 85. The centering guide 5 is also mounted on the relay spring 83. The rigidity of the relay spring 83 is stronger than the rigidity of the relay spring 82. One end of the relay spring 84 is fixed to the connecting portion 85, and the other end thereof extends to a rear end (not shown) of the in-pipe inspection apparatus A. Then, the wire 31 together with a spring extension preventive wire (not shown) is provided inside the reception sensor 7, the relay spring 81, the transmission sensor 6, the relay spring 82, the reception sensor 7, the relay spring 83, the connecting portion 85 and the relay spring 84 (not shown). It is inserted.

FIG. 4 is an enlarged sectional view of the centering guide 5. In FIG. 4, the centering guide 5 comprises a pair of mounting pieces 51 and three or more sliding pieces 52. The sliding piece 52 has elasticity and can slide along the inner wall C of the pipe. Further, the attachment piece 51 is formed with an insertion hole 51a. The tip relay spring 22 and the like are inserted through the insertion hole 51a. Then, in order to prevent the centering guide 5 from being displaced, a stopper 53 is fixed to the tip relay spring 22 and the like. FIG. 5 is an enlarged sectional view of the transmission sensor 6. In FIG. 5, a bobbin 62 is attached to the sensor body 61, and a transmitting coil 63 is wound around the bobbin 62. This transmitting coil 63 generates an electromagnetic wave. The relay spring 81 is mounted in the mounting recess 64 of the sensor body 61, and the relay spring 82 is mounted in the mounting recess 65. FIG. 6 is an enlarged sectional view of the reception sensor 7. In FIG. 6, a pair of receiving coils 72 is fixed to a sensor body 71. The receiving coil 72 detects changes in the phase and intensity of the electromagnetic wave transmitted by the transmitting coil 63 and passing between the inner wall C of the pipe and the outer wall (not shown) to detect the corrosion degree of the pipe. Further, in the tip-side receiving sensor 7, the tip relay spring 22 is mounted in the mounting recess 73 of the sensor body 71, and the relay spring 81 is mounted in the mounting recess 74. Further, in the rear side reception sensor 7, the relay spring 82 is mounted in the mounting recess 73 of the sensor body 71, and the relay spring 83 is mounted in the mounting recess 74.

With the above-described configuration, as shown in FIG. 3, when the passage mechanism B of the in-pipe inspection device A passes through the curved pipe portion C ₁ of the inner wall C of the pipe, first, the step (joint screw) of the inner wall C of the pipe is passed. the tip guide 1 to overcome the like) reaches a bent tube portion C _1, this time pulling the wire 31 to the front guide 1 opposite direction, the tip springs 21 as shown is curved upward. Therefore, the tip guide 1 is easily pushed into the curved pipe portion C ₁ . When the in-pipe inspection device A is further pushed in the direction of the curved pipe portion C ₁ of the inner wall C of the pipe, the passage mechanism B is also pushed in the curved pipe portion C ₁ direction, so that the tip guide 1 is further pushed in the direction. In this way, since wear in passing through the curved pipe portion C ₁ of the inner wall C of easily tube passing mechanism B, the pipe inspection system A can easily pass through the curved pipe portion C ₁ of the inner wall C of the tube become. At this time, since the intermediate guide 4 and the tip relay spring 22 act as a cushioning material between the tip spring 21 and the reception sensor 7, even if the tip spring 21 bends as described above, it cooperates with the centering guide 5. Thus, the position of the receiving sensor 7 can be maintained substantially on the central axis of the inner wall C of the pipe. Therefore, it is possible to accurately measure the change in the alternating magnetic field by the receiving sensor 7. Further, since the rigidity of the tip relay spring 22 is made equal to or higher than the rigidity of the tip spring 21, the force for pushing the in-pipe inspection device A into the tube is easily transmitted to the tip guide 1. In the embodiment described above, the tip spring 21 and the tip relay spring 22 are formed of the same spring, the intermediate guide 4 is mounted in the middle of this spring, and the centering guide 5 is attached to the intermediate guide 4 and the reception sensor 7. You can also install it in the middle of.

[0009]

[Effect of device]

 As described in detail above, according to the passage mechanism of the in-pipe inspection device of the present invention, it is possible to freely pass through a small diameter gas pipe or the like having a large number of curved pipe portions. In particular, it can freely pass through a curved pipe portion such as a 90 ° elbow, and can freely pass through a relatively small distance small-diameter gas pipe including three or more 90 ° elbow curved pipe portions. Therefore, it is possible to easily inspect the corrosion degree of a small-diameter gas pipe or the like having many curved pipe portions.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a front view of the embodiment as it passes through a curved pipe portion of the inner wall of the pipe.

FIG. 4 is an enlarged cross-sectional view of the centering guide of the one embodiment.

FIG. 5 is an enlarged cross-sectional view of the transmission sensor of the one embodiment.

FIG. 6 is an enlarged cross-sectional view of the reception sensor of the one embodiment.

FIG. 7 is a front view of a conventional example.

[Explanation of symbols]

 A In-pipe inspection device B Passing mechanism 1 Tip guide 2 Spring member 21 Tip spring 22 Tip relay spring 31 Wire 4 Intermediate guide

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Naoki Taoka 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka (72) Creator Kenji Suyama 1-1-15 Kataseyama, Fujisawa-shi, Kanagawa No. 8 (72) Inventor Suzuki, 3-3 Shiomidai, Isogo-ku, Yokohama Incorporated (72) Inventor Masayuki Ishikawa 19-18 Sakurada-cho, Atsuta-ku, Nagoya, Aichi Toho Gas Co., Ltd. (72) Inventor Kimio Nakajima 4-53, Kitahama, Chuo-ku, Osaka-shi, Osaka Sumitomo Metals Industry Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A tip guide provided at the tip, a spring member having one end fixed to the tip guide and the other end fixed to the tip of the in-pipe inspection apparatus, and an intermediate member disposed in the middle of the spring member. A guide member and a wire, one end of which is attached to the tip guide and is laid along the spring member, and when a pulling force in a direction opposite to the tip guide is applied to the wire, the spring member A passage mechanism for an in-pipe inspection device, characterized in that a front end side portion of the intermediate guide member is bent.