TWI741823B - Guide tube - Google Patents

Abstract

The tip guide tube includes a cable provided with a connection terminal, a flexible tip portion to which the cable is fixed, a body portion to which the tip portion is connected, and a cover portion that fixes the cable so as to advance and retreat and is fitted to the body portion. The additional guide tube includes: an additional cable equipped with an additional connection terminal and a sliding terminal, an additional body, an additional cover that fixes the additional cable so that it can advance and retreat and is fitted to the additional body, and is arranged on the additional cover and A sliding part that restricts the movement of the sliding terminal that can advance and retreat in the longitudinal direction of the additional cover. The leading end guide tube and the additional guide tube are integrated into one, and the leading end is bent by pulling the additional connecting terminal.

Description

Guide tube

The present invention relates to a guide tube, which is used to guide and insert a sensor for measuring the thickness of the heat transfer tube of a boiler into the heat transfer tube. In this case, priority is claimed based on Special Application No. 2019-191111 filed in Japan on October 18, 2019, and its content is used here.

In factories equipped with "coal-fired boilers in thermal power plants, waste heat boilers for power generation and other boilers in waste incinerators," sensors are used to periodically measure the thickness of the boiler's heat transfer tubes (boiler tubes) Measurement. In particular, when an ultrasonic probe, which is one of the sensors, is inserted into the heat transfer tube filled with water, it is called "immersion UT" ("UT" is the abbreviation of Ultrasonic Testing in English). In this plant, the plurality of heat transfer tubes are branch tubes extending in a straight line in the horizontal direction, and are connected orthogonally to the central axis of the branch tube. In addition, the branch pipe is equipped with an inspection pipe stand for inspecting the inside facing the end of the central axis installed in the aisle of the factory or the side facing the aisle. The pipe stand is integrated with the branch pipe by welding. If the tube base is provided with an openable and closable flange, it is melted to open the opening. After a predetermined operation, the lid is welded again to seal the opening.

When measuring the thickness of the heat transfer tube, it is necessary for the operator to open the tube base and pass the sensor from the opening through the inside of the branch tube to the heat transfer tube that is the target of the thickness measurement. However, the inner diameter of the branch pipe is generally small, and it is difficult for operators to pass. Therefore, instead of an operator who inserts the sensor into the target heat transfer tube through the inside of the branch pipe, the guide tube is used as a device for guiding and inserting the sensor into the heat transfer tube. That is, the guide tube is used to allow the sensor to pass through the inside of the branch tube from the opening to the heat transfer tube, and to guide and insert the sensor to the heat transfer tube opened in the branch tube Opening device.

Applicant, regarding the guide tube inserted from the opening of the tube stand arranged on the side of the branch pipe (refer to Patent Document 1), and the guide tube inserted from the opening of the tube stand arranged on the end of the central axis of the branch pipe The guide tube (refer to Patent Document 2) is already disclosed. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 6004989 [Patent Document 2] Japanese Patent No. 6260070

[The problem to be solved by the invention]

However, the guide tube disclosed in Patent Document 1 needs to bend the guide tube at a plurality of positions, so the structure is slightly complicated. On the other hand, the guide tube disclosed in Patent Document 2 only needs to bend one part of the guide tube. Specifically, it is sufficient to bend the tip of the guide tube by about 90°. Therefore, compared with the guide tube disclosed in Patent Document 1, the structure can be simplified. However, in general, the width of the aisle is relatively narrow, and in the direction facing the tube platform sandwiching the aisle, other devices in the factory are arranged, or there are walls of the factory. Therefore, there is an upper limit on the length of the linear guide pipe that can be inserted into the branch pipe from the opening of the pipe stand in the walkway where the operator performs work during the thickness measurement. Therefore, when the length of the branch tube is much longer than the guide tube disclosed in Patent Document 2, the length of the guide tube will be insufficient. Therefore, among the heat transfer tubes connected to the branch tube, some of the heat transfer tubes cannot be guided to insert the above-mentioned sensor. If the length of the guide tube is insufficient, other guide tubes will be considered. However, it is necessary to reliably recover the cable connected to the sensor from the heat transfer tube. Therefore, in general, cables with a length of tens of meters or more with or without interruption are used, and cables that are broken into shorter cables are not used for multiple connections. On the other hand, since the operator manipulates the rope on the side opposite to the front end of the guide tube that bends, the length of the rope that operates the bend of the guide tube is designed to be equivalent to the length of the guide tube, in other words, It is a little longer than the length of the guide tube. Therefore, if the length of the guide tube is insufficient, if only a cylindrical other guide tube is added, it is necessary to insert the longer cable end into the other guide tube. Therefore, there is a concern that the time consumption will be lengthened. Moreover, if other cables equal to the length of the other guide tubes are connected to the cables used to operate the bending of the guide tubes, the cables will be pulled away from the guide tubes by a large distance and bend. It is stuck to the welding part of the inner wall of the branch pipe and cut, which may cause a malfunction. As a result, the guide tube may not be able to properly guide the sensor to the heat transfer tube. Therefore, it is desired to develop a simple structure that can be quickly and easily connected by an operator, and a guide tube that can appropriately guide the above-mentioned sensor to the heat transfer tube.

The present invention provides a guide tube, which has a simple structure and is not affected by the length of the branch tube, so that the above-mentioned sensor can be appropriately guided to the heat transfer tube. [Technical means to solve the problem]

In order to solve the above-mentioned problems, the guide tube of the present invention is to cover the sensor for measuring the thickness of the heat transfer tube and the cable connected to the sensor, so as to start from the central axis of the branch tube of the boiler. The opening of the tube stand arranged at one end of the upper end is guided to the heat transfer tube connected to the branch pipe, and is characterized by having: the sensor is housed as a releasable leading end guide tube, which can be connected to the leading end The first additional guide tube of the guide tube, the front end guide tube, is provided with: a cable with the connecting terminal arranged at one end; a front end with the other end of the cable fixed and bendable; and a main body at one end Connected to the front end portion, which is rod-shaped and has a substantially U-shaped cross-section; and a cover portion, which fixes the cable on the surface so as to be able to advance and retreat, and is fitted into the body portion from the inner surface, and the first additional guide tube , Equipped with: additional cable, which is equipped with an additional connection terminal at one end and a sliding terminal at the other end; an additional body part, which is rod-shaped and a cross-section roughly in the shape of a letter; an additional cover part, which adds the aforementioned addition on the surface The cable is fixed so that it can advance and retreat, and is fitted into the additional main body from the inner surface; and a sliding part, which is arranged on the surface of the additional cover, and restricts the movement of the sliding terminal to the length of the additional cover. Advancing and retreating a predetermined distance, the connecting terminal is connected to the sliding terminal, the sensor is housed in the front end portion, the other end of the main body is connected to one end of the additional main body, and the additional main body is connected inside the main body The cable is arranged inside the portion, and the cover portion and the additional cover portion are respectively fitted into the body portion and the additional body portion, thereby integrating the tip guide tube and the first additional guide tube It becomes a cylindrical shape, and the additional connection terminal is pulled to bend the front end. [Effects of Invention]

According to the present invention, the additional guide tube is connected to the front-end guide tube, and the length of the guide tube can be increased. In other words, even if the length of the branch pipe is much longer than the length of the distal guide tube, the additional guide tube can be properly connected to the distal guide tube to guide the sensor to Only the front guide tube cannot guide the heat transfer tube of the sensor. Furthermore, when the additional guide tube is connected to the distal guide tube, the additional guide tube may be formed into a cylindrical shape by fitting the additional cover part after the cable is housed in the additional main body part. Therefore, the connection time of the additional guide tube for the operator can be shortened. In addition, the cable of the leading end guide tube and the additional cable of the additional guide tube connected to the cable are each fixed to the surface of the cover portion and the additional cover portion so as to advance and retreat. Then, the connection terminal of the cable and the sliding terminal of the additional cable are connected. In addition, the sliding part arranged on the surface of the additional cover part restricts the movement of the sliding terminal. Therefore, there is no fear that the cables are separated by a large distance from the front-end guide tube and the additional guide tube and flex and cause the guide tube to malfunction. Therefore, it is possible to provide a guide tube which has a simple structure and is not affected by the length of the branch tube, so that the above-mentioned sensor can be appropriately guided to the heat transfer tube.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, first, using FIG. 1, after describing the outline of the tube thickness measurement system using the guide tube of the present invention, the guide tube 1 of the embodiment will be described in detail using FIGS. 2 to 7. In addition, the appropriate figure shows the orthogonal coordinate system formed by the x-axis, y-axis, and z-axis. The plane (xy plane) containing the x-axis and the y-axis is a horizontal plane, and the direction indicated by the arrow of the z-axis is the vertical direction and the upward direction. Also, the so-called "+x-axis direction (positive x-axis direction)" represents the direction pointed by the arrow of the x-axis, and the so-called "-x axis direction (negative x-axis direction)" represents the direction opposite to the direction pointed by the x-axis arrow direction. "+y axis direction (positive y axis direction)" and "-y axis direction (negative y axis direction)", "+z axis direction (positive z axis direction)" and "-z axis direction (negative z axis direction) )" is the same.

First, using FIG. 1, a tube thickness measurement system using the guide tube 1 will be described. In a plant equipped with "coal-fired boilers in thermal power plants, waste heat boilers for power generation and other boilers in waste incinerators," the boiler has a plurality of heat transfer tubes 2 that are horizontally extending branch tubes 3 Orthogonal and connected. The branch pipe 3 is provided with a pipe stand 5 protruding in the horizontal direction at the end that faces the walkway 4, which is a passage through which the operator can work. The tube stand 5 has a cylindrical shape with an outer diameter smaller than that of the branch pipe 3. The tube stand 5 is arranged so that the central axis of the branch pipe 3 and the central axis of the tube stand 5 coincide. One end of the pipe stand 5 is connected to the branch pipe 3 and connected. The other end of the tube stand 5 is welded with a metal plate in a non-opening manner, and is plugged by a flange. The other end is opened when the guide tube 1 is inserted into the branch pipe 3. The thickness measurement of the heat transfer tube 2 connected to the branch tube 3 is carried out by a tube thickness measurement system. The tube thickness measurement system has at least: a sensor 6 for measuring the thickness of the heat transfer tube by ultrasonic waves, etc. The detector 6 is connected to a cable 7 at one end, an analysis device 8 connected to the other end of the cable 7, and a display device 9 that displays the calculation result of the analysis device 8. The analysis device 8 calculates the thickness of the heat transfer tube 2 based on the information measured by the sensor 6 with ultrasonic waves or the like. The analysis device 8 displays the result of the calculation (information about the thickness of the heat transfer tube 2) on the display device 9. The analysis device 8 is an arithmetic device such as a computer. Here, although the analysis device 8 and the display device 9 such as a display are described separately, there is no need to separate them. For example, the analysis device 8 and the display device 9 may be an integrated notebook personal computer. The cable 7 is a cable that is bendable and transmits electrical signals (specifically, information measured by the sensor 6) from the sensor 6 to the analysis device 8. The cable 7 has no segments and has a length of more than tens of meters. Therefore, the pipe thickness measurement system includes the cable winding device 10. The cable winding device 10 can perform automatic or manual winding of the cable 7, or automatic or manual pulling out. The guide tube 1 described in detail later is a part of the tube thickness measurement system. The guide tube 1 is inserted into the branch tube 3 to guide the sensor 6 to the opening of the predetermined heat transfer tube 2 connected to the branch tube 3. The front end of the guide pipe 1 and the cable operating device 11 arranged in the walkway 4 are connected to each other by a cable. In addition, the operator operates the rope operating device 11, thereby making the tip end substantially at a right angle to the central axis of the branch pipe 3, that is, bend in a direction of approximately 90°. Since the central axis of the branch pipe 3 and the central axis of the heat transfer tube 2 are orthogonal, the sensor 6 can be easily inserted into the predetermined heat transfer tube 2. In addition, the rope operating device 11 may be arranged on a work platform 12 of an appropriate height.

Then, the guide tube 1 will be explained using Figs. 2-7. After the outline of the main structure of the guide tube 1 is described, other structures including the main structure are also described in detail. In addition, here, the cable operating device 11 pulls the bending cable 16a by adding the cable 22a. Specifically, among the bending reel 11a and the straightening reel 11b provided in the rope operating device 11, the straightening reel 11b is relaxed, and the additional cable 22a is wound up with the bending reel 11a. Thereby, the bending cable 16a connected therewith is pulled, and the front end 17 of the guide tube 13 at the front end of the guide tube 1 is bent. In addition, the cable operating device 11 pulls the straightening cable 16b by adding the cable 22b. Specifically, the bending reel 11a is relaxed, and the additional cable 22b is wound up with the straightening reel 11b. Thereby, the straightening cable 16b connected therewith is pulled, and the front end 17 of the guiding pipe 13 at the front end of the guiding pipe 1 is straightened. Therefore, in FIGS. 2-7, two rows of cables corresponding to each of the bending reel 11a and the straightening reel 11b are shown. However, it is not limited to this, and a mechanism for straightening the end portion 17 before bending may be realized without using the cable 16b. For example, it can be realized by connecting an elastic pushing member such as a spring or rubber to the front end portion 17 and the main body portion 18. That is, by adding the cable 22a, the bending cable 16a is pulled by the cable operating device 11, thereby bending the front end portion 17 of the guiding pipe 13 at the front end of the guiding pipe 1. Furthermore, by adding the cable 22a to relax the tension of the bending cable 16a with the cable operating device 11, the front end 17 can be automatically straightened with the force of the elastic pushing member. In the following description, among the two rows of cables shown in the figure, the respective constituent elements will be described particularly with respect to the cables of one row formed by the bending cable 16a and the singular or plural additional cables 22a connected thereto. The description corresponding to the rope in the row corresponding to the straightening rope 16b is the same as the description corresponding to the bending rope 16a, so it is omitted. As for each component, the rope corresponding to one row of the straightening rope 16b may additionally have the same structure as that of the rope corresponding to the one row of the bending rope 16a.

First, the outline of the main structure of the guide tube 1 will be described. The guide tube 1 is covered with a sensor 6 that measures the thickness of the heat transfer tube 2 and a cable 7 connected to the sensor 6 from one end of the central axis of the branch pipe 3 of the boiler. The opening of the tube stand 5 is guided to the heat transfer tube 2 connected to the branch tube 3. The guide tube 1 has at least a distal guide tube 13 that stores the sensor 6 so as to be releasable, and an additional guide tube 14 that can be connected to the distal guide tube 13. To the additional guide tube 14 described later (for example, the first additional guide tube 14a), another additional guide tube 14 (for example, the second additional guide tube 14b) of the same structure can be connected. Therefore, a plurality of additional guide tubes 14 of the same structure are prepared, so that the guide tube 1 can guide the sensor 6 to the predetermined heat transfer tube 2 without being affected by the length of the branch tube 3. The tip guide tube 13 includes at least a cable 16, a tip portion 17, a main body portion 18, and a cover portion 19. The cable 16 is provided with a connection terminal 15 at one end. The front end 17 is fixed with the other end of the cable 16 and can be bent. The main body portion 18 has a rod-like shape with a front end portion 17 connected to one end and has a substantially U-shaped cross section (equivalent to "U" in the English alphabet). The cover 19 fixes the cable 16 on the surface so as to be able to advance and retreat, and is fitted into the main body 18 from the inner surface. The additional guide tube 14 includes at least an additional cable 22, an additional main body portion 23, an additional cover portion 24, and a sliding portion 25. The additional cable 22 has an additional connection terminal 20 arranged at one end, and a sliding terminal 21 arranged at the other end. The additional main body 23 has a rod-like shape and a cross-sectional shape of a letter (corresponding to "U" of the English alphabet). The additional cover portion 24 fixes the additional cable 22 on the surface so as to be able to advance and retreat, and is fitted into the additional main body portion 23 from the inner surface. The sliding portion 25 is arranged on the surface of the additional cover 24 and restricts the movement of the sliding terminal 21 to only a predetermined distance in the longitudinal direction (x-axis direction) of the additional cover 24. Then, for example, in the case where the guide tube 1 is formed by the distal end guide tube 13 and one additional guide tube 14 (first additional guide tube 14a), the sensor 6 is housed in the distal end portion 17 and the main body The other end of 18 is connected to one end of the additional main body 23. In addition, the cable 7 is arranged inside the main body 18 and the additional main body 23, and the cover 19 and the additional cover 24 are fitted to the main body 18 and the additional main body 23, respectively. Thereby, the distal guide tube 13 and the additional guide tube 14 (the first additional guide tube 14a) are integrated into a cylindrical shape. At this time, the connection terminal 15 is connected to the sliding terminal 21, and the additional connection terminal 20 is pulled. Thereby, the slide terminal 21 at the other end of the additional cable 22 (the additional cable 22a connected to the bending cable 16a) is pulled. As a result, the connection terminal 15 connected to the slide terminal 21 is pulled, and the front end part 17 of the other end of the cable 16 (bending cable 16a) fixed to it is bent.

Then, in addition to the structure that the guide tube 1 has at least, other structures will be described in detail. First, after describing the structure of the cover 19 and the additional cover 24, the main body 18, the additional main body 23, and the structure of the front end 17 connected to the main body 18 will be described. The cable 16 is fixed to the surface of the cover 19 so that it can advance and retreat is a cable guide 26 (refer to FIGS. 2(a) and (b)). The cable guide 26 is arranged on the surface of the cover 19. The cable guide portion 26 is a through hole having an inner diameter slightly larger than the diameter of the cable 16 in the longitudinal direction (x-axis direction) of the rectangular plate-shaped cover portion 19. By arranging the cable 16 through the through hole, the cable 16 is fixed so as to be able to advance and retreat in the longitudinal direction (x-axis direction) of the cover 19. In Figs. 2(a) and (b), three cable guides 26 are arranged on the surface of the cover 19 at equal intervals. From the viewpoint of reducing the deflection of the cable 16, it is preferable to arrange a plurality of cable guides 26, but it is also possible to arrange only two or more than four according to the design. Moreover, it is the additional cable guide part 27 (refer FIG. 2(a), (b)) which fixes the additional cable 22 so that it can advance and retreat on the surface of the additional cover part 24. The additional cable guide portion 27 is arranged on the surface of the additional cover portion 24. The additional cable guide portion 27 is a through hole having an inner diameter slightly larger than the diameter of the additional cable 22 in the longitudinal direction (x-axis direction) of the additional cover portion 24 in the shape of a rectangular plate. The additional cable 22 is arranged through the through hole, whereby the additional cable 22 is fixed so as to be able to advance and retreat in the longitudinal direction (x-axis direction) of the additional cover 24. In FIG. 2, two additional cable guides 27 are arranged on the surface of the additional cover 24. From the viewpoint of reducing the deflection of the additional cable 22, it is preferable to arrange a plurality of additional cable guides 27. However, since the sliding part 25 mentioned later is arrange|positioned in the additional cover part 24, you may arrange|position only one according to design. In addition, three or more additional cable guides 27 may be arranged according to the design. The guide tube 1 provided with the cable guide part 26, the additional rope guide part 27, and the sliding part 25 described later, does not make the cable 16 or the additional cable 22 largely empty from the leading end guide tube 13 and the additional guide tube 14 Flexed by the distance. Therefore, it is possible to prevent the failure of the guide tube caused by the bending of the cable.

The sliding part 25 is arranged on the surface of the additional cover part 24. The sliding part 25 is a rectangular column-shaped and hollow component (refer to Figure 2 (a), (b)), which restricts the movement of the sliding terminal 21 to only advance and retreat in the longitudinal direction (x-axis direction) of the additional cover 24 Established distance. As shown in FIGS. 3(a) and 4, the sliding portion 25 is composed of a box-shaped exterior portion 25a that opens one surface of a quadrangular column (the lower surface among the two surfaces in the z-axis direction) , The surface of the additional cover portion 24 to which the opening of the exterior portion 25a is connected. On the surface covered by the exterior portion 25a, a groove 25b extending in the x-axis direction is formed, which restricts the movement of the sliding terminal 21 in the y-axis direction and allows the sliding terminal 21 to move in the x-axis direction. Here, although the groove 25b is formed on the surface of the additional cover portion 24, the groove 25b may not be formed on the surface of the additional cover portion 24, and a rectangular plate is connected to the opening of the exterior portion 25a, and the plate is formed A groove corresponding to groove 25b. The length of the groove 25b in the x-axis direction is the same size as the above-mentioned predetermined distance at which the sliding terminal 21 can advance and retreat. In addition, the dimension of the groove 25b in the y-axis direction (the dimension of the groove width) is substantially the same as the dimension W of the width of the sliding terminal 21 described later, and is slightly larger. The dimension of the groove 25b in the z-axis direction (the dimension of the groove depth) is approximately 1/3 of the height dimension H of the sliding terminal 21 described later. Both sides of the exterior portion 25a arranged in the y-axis direction are rectangular plates. In addition, one of the two side surfaces (the side in the -x direction and the side in the +x direction) in the x-axis direction (the side in the -x-axis direction) is connected to the two side surfaces in the y-axis direction. Rectangular plate. One of the two side surfaces is provided with a through hole, the size of which is larger than the diameter of the additional cable 22, and the sliding terminal 21 cannot pass through. In addition, the additional cable 22 is inserted into the through hole. The other side (the side in the +x-axis direction) of the two sides in the x-axis direction (the side in the -x-axis direction and the side in the +x-axis direction) and the upper surface connected to the four sides, each with a groove along 25b and mutually connected rectangular openings. The opening is a little smaller than the dimension D in the -x-axis direction from the other side, and a little smaller than the dimension W in the y-axis direction, and has a dimension sufficiently larger than the diameter of the cable 16 and the additional cable 22 form. The dimension in the z-axis direction from the bottom surface of the groove 25b to the upper surface of the exterior portion 25a is substantially the same as the dimension H, and is a slightly larger dimension. Therefore, the sliding terminal 21 does not detach from the groove 25b, and can move in the x-axis direction only inside the sliding portion 25.

As shown in Fig. 3(b), the sliding terminal 21 is a quadrangular column whose length in the x-axis direction is the dimension D, the length (width) in the y-axis direction is the dimension W, and the length (height) in the z-axis direction is the dimension H And hollow parts. The bottom surface of the sliding terminal 21 (the surface below the vertical direction among the two surfaces arranged in parallel in the z-axis direction) is a rectangular plate having a size D×a size W. The bottom surface is arranged in the groove 25b. Among the four side surfaces of the sliding terminal 21, two side surfaces arranged in parallel in the y-axis direction are both rectangular plates with a size D×a size H. In addition, in the following description, sizes W (uppercase) and size w (lowercase), which are different from each other, are appropriately used. Among the side surfaces of the sliding terminal 21, one of the two sides (the side in the -x direction and the side in the +x direction) arranged in the x-axis direction (the side in the -x-axis direction) is dimension W×dimension H An additional cable 22 is connected to the center of the rectangular plate. The other side (the side surface in the +x-axis direction) is a shape in which an opening is opened in a part of a rectangular plate of size W x size H. Specifically, a rectangular opening is opened in the center, which in the y-axis direction is a size w that is slightly larger than the diameter of the cable 16 and the additional cable 22, and in the z-axis direction is to buckle the sliding terminal 21 from the size H The shorter dimension h of the bottom component. The upper surface of the sliding terminal 21 (the upper surface among the two surfaces arranged in the z-axis direction) has a shape in which an opening is opened in a part of a rectangular plate having a size D×a size W. Specifically, an opening (hereinafter referred to as "large opening") obtained by subtracting the dimension d from the side surface in the -x-axis direction in the +x-axis direction is formed. In addition, in the center, there is formed a rectangular opening (hereinafter referred to as a "small opening") of a size w that is connected to the "large opening" and the opening of the size w×dimension h on the side surface in the +x-axis direction. The connection terminal 15 arranged on the cable 16 and the additional connection terminal 20 arranged on the additional cable 22 are cylindrical members having a longer diameter than the diameter of the cables. Specifically, it has a bottom surface and an upper surface with a diameter larger than the size w and smaller than the size W and the size h (in other words, smaller than the inner size of the side surface of the sliding terminal 21 arranged in the x-axis direction), and the height is greater than A cylindrical member with a smaller size d. Moreover, one end of the corresponding cable 16 or the additional cable 22 is connected to the bottom surface. Furthermore, the corner posts may be used as the connecting terminals 15. Similarly, the sides of the bottom and upper surfaces are larger than the dimension w, and smaller than the inner dimension of the side surface of the sliding terminal 21 arranged in the x-axis direction, and the height is greater than the dimension d is still small. Therefore, the connecting terminal 15 or the additional connecting terminal 20 can be inserted through the opening of the exterior portion 25a, from the above-mentioned communicating opening of the sliding terminal 21, and the cables connected to them can be drawn in a linear state and housed in the sliding terminal. 21's interior.

The state of the connection terminal 15 or the additional connection terminal 20 accommodated in the sliding portion 25 will be explained using FIG. 4. As shown in FIG. 4(a), the sliding terminal 21 is moved to the opening of the exterior portion 25a. At this time, when the connection terminal 15 or the additional connection terminal 20 is inserted into the inside from the "large opening" of the sliding terminal 21, the connection terminal 15 or the additional connection terminal 20 exists directly under the "large opening". Then, as shown in FIG. 4(b), when the additional cable 22 connected to the sliding terminal 21 is pulled in the -x-axis direction by the cable operating device 11, the connection terminal 15 or the additional connection terminal 20 stored in the sliding terminal 21 will be stored. It moves inside the sliding terminal 21 to just below the "small opening". Once the connection terminal 15 or the additional connection terminal 20 is moved to just below the "small opening" of the sliding terminal 21, the connection terminal 15 or the additional connection terminal 20 will be housed in a small area covered by the upper, lower, left and right walls of the sliding terminal 21 Room. The exit of this small room only has the -x axis direction. Therefore, even if the front end portion 17 of the guide tube 1 is bent, the received connection terminal 15 or the additional connection terminal 20 is not easily separated from the sliding terminal 21. In addition, when the front end 17 of the guide tube 1 is bent (or straightened), the cable operating device 11 is tightened or loosened to connect the cable 16 and the singular or plural additional cables 22 to form a row. The cable maintains a certain tension. Therefore, it is more difficult to cause the connection terminal 15 or the additional connection terminal 20 to come out of the small room and to detach from the sliding terminal 21. Therefore, according to the guide tube 1, no screws or the like are required, and the single action of inserting the connecting terminal 15 or the additional connecting terminal 20 into the sliding terminal 21 can connect the connecting terminal 15 or the additional connecting terminal 20 to the sliding terminal 21 very simply and firmly. Sliding terminal 21. As a result, the cable 16 and the additional cable 22 can be connected, or the additional cables 22 can be connected to each other. That is, the guide tube 1 has a simple structure that the operator can quickly and easily connect.

Hooks 28a (refer to FIG. 5) are respectively arranged at both ends in the y-axis direction of the inner surface of the cover portion 19 and the inner surface of the additional cover portion 24. The hook 28a is formed in an "L" shape ("L" shape in English) that protrudes in the -z axis direction and extends from the tip of the protruding part in the +x axis direction. The hook 28a is a part combined with a hook receiver 28b arranged in the main body portion 18 and the additional main body portion 23 described later. The hook 28a and the hook receiver 28b constitute the locking portion 28 in this pair. The length of the hook 28a in the x-axis direction is the dimension β. The distance in the z-axis direction between the portion extending in the +x-axis direction of the hook 28a and the inner surface of the cover 19 or the inner surface of the additional cover 24 is the dimension α. The thickness in the z-axis direction of the portion extending in the +x-axis direction is the dimension γ. The fitting of the hook 28a and the hook receiver 28b will be described later.

Then, the main body 18 and the additional main body 23 will be described in detail next. The main body portion 18 has a rod-like or linear shape with a tip portion 17 connected to one end (see FIG. 2(c)). In addition, the cross-sectional shape of the yz plane of the main body portion 18 is a substantially U-shaped shape (equivalent to the "U" of the English letter) with the +z-axis direction opened. The additional main body 23 has a rod-like or linear shape. In addition, the cross-sectional shape of the yz plane of the additional main body portion 23 is a substantially U-shaped shape (equivalent to the "U" of the English alphabet) with the +z-axis direction opened. As shown in FIGS. 7(b) and 7(c), when viewed from the yz plane, hook receivers 28b are respectively arranged on the inner walls of the main body 18 and the additional main body 23 on the y axis. As shown in FIG. 5, the hook receiver 28b is provided with a rectangular columnar vertical hole and a horizontal hole extending in the +x-axis direction from the bottom of the hole. The vertical hole is formed in a size β´ which is slightly larger than the size β in the x-axis direction, and a size which is slightly larger than the size of the hook 28a in the y-axis direction in the y-axis direction, and the depth dimension is (α´+ γ´) in the shape of a four-cornered column. The dimension in the y-axis direction of the horizontal hole is slightly larger than the dimension in the y-axis direction of the hook 28a, and the dimension in the z-axis direction is the dimension γ´. Here, the size α´ is a size slightly smaller than the above-mentioned size α, and the size γ´ is a size slightly larger than the above-mentioned size γ. That is, the relationship is α>α´, β<β´, and γ<γ´. Therefore, the hook 28a arranged on the inner surface of the lid portion 19 or the inner surface of the additional lid portion 24 is inserted into the vertical hole in the -z axis direction. Then, by moving in the +x-axis direction, a part of the hook 28a can be fitted into the horizontal hole in a single motion. Due to this fitting, the cover 19 or the additional cover 24 is substantially unable to move from the corresponding main body 18 or the additional main body 23 in the y-axis direction and the z-axis direction. And by this fitting, the cover part 19 is fixed to the main body part 18, and the cylindrical front-end|tip guide tube 13 is formed. In addition, the additional cover part 24 is fixed to the additional main body part 23 to form an additional guide tube 14 having a cylindrical shape.

Also, as shown in Figure 2 (a) and (b), a plurality of additional guide tubes 14 (the first additional guide tube 14a, the second additional guide tube 14b) are sequentially connected from the distal guide tube 13 , The third additional guide tube 14c), and the guide tube 1 is integrated into a cylindrical shape. At this time, the cover part 19 and the plurality of additional cover parts 24 are designed to be in contact with the adjacent cover part 19 or the additional cover part 24 to perform the above-mentioned fitting. In addition, when the guide tube 1 and the cable operating device 11 are connected, the additional cover portion 24 of the additional guide tube 14 (third additional guide tube 14c) that is closest to the -x axis direction is arranged after the above-mentioned fitting , The cable operating device 11 is brought into contact with or pressed against the additional cover 24 so that it cannot move in the -x-axis direction. In this way, the additional guide tube 14 arranged in the most -x-axis direction is connected to the cable operating device 11. Therefore, all the cover parts 19 or a plurality of additional cover parts 24 of the guide tube 1 cannot substantially move in the x-axis direction. In other words, the tip guide tube 13 constituting the guide tube 1 and the cover 19 or the additional cover 24 of the additional guide tube 14 directly or indirectly connected thereto do not require screws or the like. Therefore, these are substantially inseparably fixed to the corresponding main body portion 18 or the additional main body portion 23, and as long as the operator does not disassemble the guide tube 1, there is no risk of separation. That is, the guide tube 1 has a simple structure that can be quickly and easily connected by an operator, and the cover 19 or the additional cover 24 does not accidentally come off, and is a structure that firmly maintains the integrity. Here, FIG. 2 shows that the three additional guide tubes 14 are connected to the leading end guide tube 13, and the additional guide tube 14 at the end (here, the third additional guide tube 14c) is connected to the cable operating device 11 structure. However, the number of additional guide tubes 14 can also be adapted to the length of the branch pipe 3, and there is only one of the first additional guide tubes 14a, or the first additional guide tube 14a and the second additional guide tube 14b. Two of them can also be four or more. The leading end guide tube 13 and the singular or plural additional guide tubes 14 are sequentially connected to form an integrated guide tube 1. At this time, the additional connecting terminal 20 of each additional guiding pipe 14 is directly or indirectly pulled by the cable operating device 11 connected to the additional guiding pipe 14 at the distal end of the leading end guiding pipe 13. Thereby, the additional cable 22 directly or indirectly connected to the cable 16 fixed to the front end portion 17 is pulled, and the front end portion 17 is bent.

The shape of the main body 18, as shown in FIG. 2(c), is a substantially rectangular shape that is long in the x-axis direction when the xy plane is viewed from above. However, the shape of the end in the -x-axis direction of the main body 18 is a convex shape that protrudes from the center in the y-axis direction in the y-axis direction with a predetermined width in the -x-axis direction. In addition, a distal end 17 described later is connected to the end of the main body 18 in the +x-axis direction. In addition, the shape of the additional main body 23 is a substantially rectangular shape that is longer in the x-axis direction when the xy plane is viewed from above. However, the shape of the two end portions in the x-axis direction of the additional main body 23 is a convex shape protruding from the center in the y-axis direction in the y-axis direction with a predetermined width in the x-axis direction. Hereinafter, the convex-shaped end of the main body 18 and the convex-shaped end of the additional main body 23 are referred to as the convex end 30. Inside the main body portion 18 and the additional main body portion 23, as shown in Figs. 7(b) and (c), from one end to the other end on the x-axis, a cable mounting table 31 is arranged, which is formed with The diameter of the cable 7 is substantially the same with a slightly larger depression. The recess is arranged in the center of the main body 18 and the additional main body 23 in the y-axis direction. In addition, since the recess is open in the +z axis direction, the cable 7 can be placed on the cable mounting table 31 from above to below. In addition, the cable mounting table 31 is designed so as not to hinder the engagement of the L-shaped hook 28a of the locking portion 28 with the hook receiver 28b. The cable mounting table 31 is arranged from one end to the other end on the x-axis of the main body 18 and the additional main body 23. Therefore, as shown in FIG. 7( a ), the convex end 30 also has a recess corresponding to the cable mounting table 31. The main body 18 and the additional main body 23 are provided with a cable mounting table 31, whereby a plurality of additional guide tubes 14 are sequentially connected from the leading end of the guide tube 13, and the guide tube 1 is integrated into a cylindrical shape. At this time, as shown in FIG. 2(c), a single cable 7 without a seam can be arranged in a straight line along the central axis of the guide tube 1 without bending. After the sensor 6 housed in the front end 17 of the guide tube 1 is guided to the predetermined heat transfer tube 2, when the sensor 6 is inserted into the heat transfer tube 2, the operator in the aisle 4, Push the cable 7 into the guide tube 1. By pushing out the cable 7, the sensor 6 connected to the cable 7 is released from the front end portion 17 and enters the heat transfer tube 2. At this time, the cable 7 is arranged in the recess of the cable mounting table 31. Therefore, the bending of the bendable cable 7 is hindered, and the cable 7 can be appropriately pushed out. That is, according to the guide tube 1, the sensor 7 can be appropriately inserted into the predetermined heat transfer tube 2.

A plurality of additional guide tubes 14 are sequentially connected from the leading end guide tube 13 to form a guide tube 1 integrated into a cylindrical shape. At this time, as shown in FIG. 2, FIG. 6, and FIG. 7, the convex end portions 30 of the main body 18 and the additional main body 23 are mutually connected, or the convex ends of the two additional main body parts 23 connected to each other. The shaped end portions 30 are firmly connected to each other by the connecting portion 29. The connecting portion 29 is a member for firmly connecting the two adjacent and mutually connected convex end portions 30 to each other. Here, as described later, it is provided with: (1) The arm 29a and the hook 29b of the snap lock are respectively arranged on the side surfaces in the y-axis direction of the two adjacent convex end portions 30 (xz (2) The mandrel 29c and the insertion hole 29d are respectively arranged on the side walls in the x-axis direction at the front ends of the two adjacent convex ends 30 (the plate-shaped side surfaces in the yz plane) , But as shown in Figure 7 (a) is a recess corresponding to the cable mounting table 31), and are fitted with each other; The side surfaces of the front end of the shaped end portion 30 in the x-axis direction are fitted with each other. In accordance with the design, the connecting portion 29 may lack a part of the constituent elements (1), (2), and (3), and other constituent elements may be added. In addition, instead of the snap lock of (1), a rope fixed at one end is arranged on one convex end 30, and a protrusion for winding the rope is arranged on the other convex end 30, thereby The adjacent convex end portions 30 may be fixed to each other.

Then, the three constituent elements included in the connecting portion 29 will be described below. First, the buckle lock constituting the requirement (1) will be described. The snap lock, also known as the box lock, is composed of a set of an arm 29a and a hook 29b. The snap lock is a hook that hooks an arm 29a fixed to a certain member to a hook 29b fixed to another member and pushes it to fix the two members. As shown in FIG. 2(c), two snap locks are arranged to sandwich the adjacent convex end portions 30 from each other in the y-axis direction. The arm 29a and the hook 29b are arranged as follows, for example. As shown in FIG. 6( a ), a hook 29 b is arranged on the convex end 30 of the main body 18 of the distal guide tube 13. In this case, as shown in FIG. 6(b), an arm 29a is arranged at the convex end 30, which is connected to the additional main body portion 23 of the additional guide tube 14 of the distal guide tube 13 The +x axis direction is protruding. At this time, a hook 29b is arranged at the convex end portion 30 protruding in the -x-axis direction of the additional main body portion 23. However, if the adjacent convex ends 30 can be fixed to each other with arms 29a and hooks 29b, arms 29a may be arranged on the convex ends 30 of the main body 18, and the +x axis of the main body 23 may be added. The convex end 30 in the direction is provided with a hook 29b. In other words, the body portion 18 is connected to the front end portion 17 at one end, and is provided with one of the arm 29a and the hook 29b of the snap lock at the other end. In addition, the additional main body 23 connected to the other end of the main body 18 has the other of the arm 29a and the hook 29b of the snap lock at one end. In addition, FIG. 6(c) shows a state in which the distal end guide tube 13 and the additional guide tube 14 (first additional guide tube 14a) connected thereto are fixed with the corresponding arms 29a and hooks 29b.

Next, the mandrel 29c of the component (2) and the corresponding insertion hole 29d will be described. The diameter of the insertion hole 29d is substantially the same as the diameter of the mandrel 29c and is slightly larger. The center axis of the mandrel 29c is arranged along the x-axis. The mandrel 29c and the insertion hole 29d are arranged as follows, for example. As shown in FIG. 7(a), an insertion hole 29d is arranged on the side surface of the front end of the convex end portion 30 of the front end guide tube 13 in FIG. 6(a) and below the recess of the cable mounting table 31. In this case, as shown in FIG. 6(b), a mandrel 29c is arranged at the convex end 30, which is connected to the additional guide tube 14 (the first additional The +x axis direction of the guide tube 14a) protrudes. At this time, the convex end 30 protruding in the -x-axis direction of the additional guide tube 14 (the first additional guide tube 14a) is on the side of the front end of the convex end 30 and the cable mounting table 31 An insertion hole 29d is arranged below the recess. However, if the adjacent convex end portions 30 can be fitted with the mandrel 29c and the insertion hole 29d, the mandrel 29c may be arranged on the convex end portion 30 of the distal guide tube 13, and the main body portion 23 may be added. The convex end 30 in the +x-axis direction is provided with an insertion hole 29d. In other words, the main body portion 18 is connected to the tip portion 17 at one end, and is provided with one of the mandrel 29c and the insertion hole 29d at the other end. In addition, the additional main body 23 connected to the other end of the main body 18 has the other of the mandrel 29c and the insertion hole 29d at one end. In addition, it is necessary to prevent the guide tube 1 from being disassembled due to damage to the snap lock constituting the element (1). Therefore, the weight of the distal guide tube 13 and the additional guide tube 14 directly or indirectly connected thereto is designed to be sufficiently supported by the mandrel 29c and the insertion hole 29d arranged at each convex end 30. In addition, in many cases where the guide tube 14 is added, it is designed to suppress bending due to the weight. At this time, at the other end of the convex end 30 where the insertion hole 29d is arranged, the same side surface (side plate) as the front end is also arranged. In addition, the mandrel 29c inserted into the insertion hole 29d is also inserted into the insertion hole on the side of the other end. As described above, if the mandrel 29c is supported by at least two insertion holes, that is, at least two points, the support can be stably performed.

Next, the convex part 29e of the component (3) and the recessed part 29f corresponding to this are demonstrated. The convex portion 29e is, for example, a cylinder extending in the x-axis direction. The recess 29f is, for example, a recess having a diameter and length substantially the same as or slightly larger than that of the cylinder. The recess 29f may be a through hole. The convex part 29e and the concave part 29f are arrange|positioned as follows, for example. As shown in Fig. 7(a), in Fig. 6(a), the side wall of the front end of the convex end portion 30 of the guide tube 13 at the front end is below the recess of the cable mounting table 31 and at a position different from the insertion hole 29d In the position, a recessed portion 29f is arranged. In this case, as shown in FIG. 6(b), a convex portion 29e is arranged on the convex end portion 30, and the convex end portion 30 is connected to the additional guide tube 14 (first The +x axis direction of the additional guide tube 14a) protrudes. At this time, the convex end 30 protruding in the -x-axis direction of the additional guide tube 14 (the first additional guide tube 14a) is recessed on the side wall of the front end of the convex end 30 and the cable mount 31 A recessed portion 29f is arranged below the insertion hole 29d at a different position. However, if the adjacent convex terminals 30 can be fitted with each other with the convex portion 29e and the concave portion 29f, the convex portion 29e may be arranged on the convex end portion 30 of the distal guide tube 13, and the main body portion 23 may be added. The convex end 30 in the +x-axis direction is provided with a concave portion 29f. In other words, the main body portion 18 is connected to the tip portion 17 at one end, and is provided with one of the convex portion 29e and the concave portion 29f at the other end. In addition, the additional main body portion 23 connected to the other end of the main body portion 18 has the other of the convex portion 29e and the concave portion 29f at one end. As described above, even if the weight of the distal guide tube 13 and the additional guide tube 14 directly or indirectly connected thereto is designed to be sufficiently supported by the mandrel 29c and the insertion hole 29d arranged at each convex end 30, it is still There are cases in which various moments are applied to each of the adjacent distal guide tube 13 and the additional guide tube 14, or to each of the adjacent additional guide tubes 14 each other, with the mandrel 29c as the center. In this case, the buckle lock of the component (1) may be damaged and the guide tube 1 may be disassembled, or the guide tube 1 may be rotated in the yz plane with the axis of the mandrel 29c as the center. However, the convex part 29e and the concave part 29f of the adjacent convex-shaped end part 30 are fitting. Therefore, even when the moment is applied, the adjacent leading end guide tube 13 and the additional guide tube 14, or the adjacent additional guide tube 14 are restricted to perform the same motion in the yz plane. Thereby, the damage of the snap lock or the disassembly or rotation of the guide tube 1 can be prevented. Moreover, the convex part 29e of the adjacent convex-shaped end part 30 and the recessed part 29f are fitted. Therefore, the adjacent main body portion 18 and the additional main body portion 23, or two adjacent additional main body portions 23 are aligned. In this way, when viewed in the yz plane, the positions of the sides of each other will be consistent. The guide tube 1 provided with the above-mentioned connecting portion 29 has a simple structure that can be quickly and easily connected by an operator, and the integrity is firmly maintained, and further becomes a structure that is easy for the operator to work.

However, the distal guide tube 13 is different from the additional guide tube 14 in that it is provided with a pillar portion 32. As shown in FIGS. 6 and 7, the pillar portion 32 includes two bearings 32g, a connecting shaft 32f, two pillars 32a, a handle 32b, a first protrusion 32c, and a second protrusion 32d. The two bearings 32g are arranged at both ends in the y-axis direction of the bottom surface of the main body 18 (the surface facing the cover 19). The connecting shaft 32f is inserted through the bearing 32g. The two pillars 32a are connected to both ends of the connecting shaft 32f, and they can rotate synchronously around the connecting shaft 32f. The handle 32b is connected near the center of the support 32a so that one end is rotatable. The first protrusion 32c fixes the other end of the handle 32b when the support 32a is arranged along the longitudinal direction (x-axis direction) of the distal guide tube 13. The second protrusion 32d fixes the other end of the handle 32b when the support 32a is arranged in a direction (z-axis direction) perpendicular to the longitudinal direction. The first protrusion 32c and the second protrusion 32d are formed to protrude from one side of the main body 18 in the y-axis direction. The handles 32b are respectively provided with cutouts that are engaged with the first protrusion 32c and the second protrusion 32d from above. In addition, the pillar 32a is expandable and contractible, and includes pillar sleeves 32e at both ends. In FIG. 7, although the pillar 32a is shown as a corner pillar, it may be a column or a polygonal pillar. The pillar 32a is physically or mechanically expandable and contractible by means of an elastic member such as a spring or a telescopic mechanism using gears or the like. The guide tube 1 after the additional guide tube 14 is connected to the distal guide tube 13 is difficult to be inserted continuously in parallel to the axial direction of the branch tube 3, that is, the x-axis direction due to its weight. Therefore, when inserting the distal guide tube 13 into the tube stand 5, the support 32a is laid down and arranged in the longitudinal direction of the distal guide tube 13. After that, immediately after the support 32 a of the leading end guide tube 13 is completely inserted into the branch pipe 3, the operator operates the handle 32 b from outside the tube stand 5. Thereby, the support 32a is rotated and fixed in a direction perpendicular to the longitudinal direction of the distal guide tube 13. The aforementioned operation may be performed in the branch pipe 3 as long as the hand enters the branch pipe 3 from the pipe stand 5. Furthermore, the operator stretches and fixes the pillar 32a, and makes the pillar sleeves 32e at both ends of the pillar 32a contact the inner wall of the branch pipe 3. Thereby, even the guide tube 1 after the additional guide tube 14 is connected to the distal guide tube 13 can be easily and continuously inserted in the axial direction of the branch tube 3 in parallel. In addition, the inversion and expansion and contraction of the pillar 32a may be automated. For example, as long as the elastic pushing member is put into the pillar 32a and pushed against the member supporting the pillar sleeves at both ends, the expansion and contraction of the pillar 32a can be automated. With automation, it can be applied to branch pipes with small inner diameters that are difficult to work. In addition, the tip portion 17 described later is bent by approximately 90° from the longitudinal direction of the tip guide tube 13 toward the bottom surface side. Therefore, when the heat transfer tube 2 is not connected in the z-axis direction of the branch pipe 3 and below, the guide pipe 1 connected to the cable operating device 11 rotates in the axial direction of the branch pipe 3 together with the cable operating device 11. At this time, the pillar 32a is continuously in contact with the inner wall of the branch pipe 3. In addition, the front-end guide tube 13 is supported at four points by two pillars 32a, so the guide tube 1 can properly guide the sensor 6 to the heat transfer tube 2. Here, although the structure in which only the distal end guide tube 13 is provided with the pillar portion 32 has been described, not only the distal end guide tube 13 but also the guide tube 14 may be provided with the pillar portion 32. In addition, regarding the pillar 32a, although the two pillars 32a that can be rotated in synchronization with each other around the connecting shaft 32f are described, it may be designed to have only one pillar 32a, or three or more, depending on the situation. It is also possible to change the length of each structure. The guide pipe 1 provided with the above-mentioned pillar portion 32 is easy for the operator to insert along the central axis of the branch pipe 3, so it is a structure that is easy for the operator to work.

Then, finally, the front end portion 17 connected to the main body portion 18 will be described. The tip portion 17 includes a sensor housing portion 17a, a bending portion 17b, and an imaging device 17c. The sensor accommodating part 17a accommodates the sensor 6 so as to be releasable, and is formed in a cylindrical shape. The curved portion 17b is connected to the sensor housing portion 17a and bends in one direction toward the bottom surface side so that the central axis of the sensor housing portion 17a is oriented approximately 90° from the longitudinal direction of the main body portion 18. The imaging device 17c is arranged in the sensor housing portion 17a, and photographs: in a direction opposite to the direction in which the curved portion 17b is arranged along the central axis, in other words, in front of the sensor housing portion 17a. However, as long as the situation in front of the guide tube 1 can be clearly photographed, the imaging device 17c may be attached to any position near the front end of the sensor storage portion 17a. The sensor receiving portion 17a and the bending portion 17b can use the structure disclosed in the prior art document. In addition, as described above, the cable operating device 11 winds the additional cable 22a with the bending reel 11a while relaxing the straightening reel 11b. Thereby, one end is connected to the additional cable 22a by the sliding terminal 21, and the other end is fixed to the lower surface of the sensor accommodating portion 17a (the lower surface among the surfaces in the z-axis direction) for bending cable 16a (refer to the figure) 6(a)) Give a pull. As a result, the tip portion 17 of the guide tube 13 at the front end of the guide tube 1 is bent. In addition, the cable operating device 11 loosens the bending reel 11a while winding the additional cable 22b with the straightening reel 11b, thereby connecting one end to the additional cable 22b by the sliding terminal 21, and fixes the other end to The straightening cable 16b on the upper surface (the upper surface among the surfaces in the z-axis direction) of the sensor accommodating portion 17a is pulled. As a result, the front end portion 17 of the guide tube 13 at the front end of the guide tube 1 is straightened. The photographing device 17c is a device such as a CMOS sensor (Complementary MOS) or a CCD (Charge Coupled Device) that can instantly transmit the captured image or image. Although not shown, the wiring connected to the imaging device 17c to transmit images or images is connected to the analysis device 8. For wiring, in order to prevent contact with the cable 7 advancing and retreating inside the guide tube 1 from causing failures such as wire breakage, it does not go through the recess of the cable mounting table 31, but through the cable mounting table 31 and the main body 18 Or, the space between the main body parts 23 is added to connect to the analysis device 8. Furthermore, the analysis device 8 displays the video or image captured by the photographing device 17c on the display device 9. Thereby, the operator can appropriately and easily guide the sensor 6 to the desired heat transfer tube 2 connected to the branch tube 3. In addition, the wiring for transmitting the above-mentioned images or images may not be displayed using the analysis device 8 and the display device 9, but may be directly connected to a different independent portable display device to display the captured image.

Although the embodiments of the present invention have been described in detail above, the technical scope of the present invention is not limited to the embodiments, and includes design changes that do not deviate from the scope of the gist of the present invention. [Industrial availability]

According to the present invention, the additional guide tube is connected to the front-end guide tube, and the length of the guide tube can be increased. In other words, even if the length of the branch pipe is much longer than the length of the distal guide tube, the additional guide tube can be properly connected to the distal guide tube to guide the sensor to Only the front guide tube cannot guide the heat transfer tube of the sensor. Moreover, when the additional guide tube is connected to the distal guide tube, the additional guide tube is to store the cable in the additional main body, and then the additional cover can be fitted to form a cylindrical shape, so the operator can be shortened. It adds the connection time of the guide tube. In addition, the cable of the leading end guide tube and the additional cable of the additional guide tube connected to the cable are each fixed to the surface of the cover part and the additional cover part so as to advance and retreat. Furthermore, the connection terminal of the cable and the sliding terminal of the additional cable are connected, and the sliding part arranged on the surface of the additional cover part restricts the movement of the sliding terminal. Therefore, there is no fear that the cables are separated by a large distance from the front-end guide tube and the additional guide tube and flex and cause the guide tube to malfunction. Therefore, it is possible to provide a guide tube which has a simple structure and is not affected by the length of the branch tube, so that the above-mentioned sensor can be appropriately guided to the heat transfer tube.

1: Guide tube 2: Heat transfer tube 3: branch pipe 4: aisle 5: Tube station 6: Sensor 7: Cable 8: Analysis device 9: display device 10: Cable take-up device 11: Rope operating device (11a: reel for bending, 11b: reel for straightening) 12: Workbench 13: Front-end guide tube 14: Additional guide tube (14a: the first additional guide tube, 14b: the second additional guide tube, 14c: the third additional guide tube) 15: Connection terminal 16: cable (16a: bending cable, 16b: straightening cable) 17: Tip part (17a: sensor storage part, 17b: bending part, 17c: imaging device) 18: Body part 19: Lid 20: Additional connection terminals 21: Sliding terminal 22: Additional rope (22a: additional rope directly or indirectly connected to the bending rope 16a, 22b: additional rope directly or indirectly connected to the straightening rope 16b) 23: Add body part 24: Additional cover 25: Sliding part (25a: Exterior part, 25b: Groove) 26: Rope guide 27: Added cable guide 28: Locking part (28a: L-shaped hook, 28b: hook receiver) 29: connecting part (29a: arm, 29b: hook, 29c: mandrel, 29d: insertion hole, 29e: convex part, 29f: concave part) 30: convex end 31: Cable platform 32: Pillar (32a: Pillar, 32b: Handle, 32c: First protrusion, 32d: Second protrusion, 32e: Pillar sleeve, 32f: Connecting shaft, 32g: Bearing)

Fig. 1 is a schematic diagram of a tube thickness measuring system using a guide tube 1 according to an embodiment of the present invention. [Fig. 2] is a schematic diagram showing the structure of the guide pipe 1 in which a plurality of additional guide pipes and the rope operating device 11 are sequentially connected to the leading end guide pipe 13. Fig. 2(a) is a view of the guide tube 1 viewed from above, Fig. 2(b) is a view of the guide tube 1 viewed from the side, and Fig. 2(c) is a view of the cover 19 and the additional cover 24 being removed and removed from The picture viewed above. [FIG. 3] is a schematic diagram showing the structure of the sliding portion 25. FIG. 3(a) is a perspective view of the sliding portion 25 viewed from above, and FIG. 3(b) is a schematic diagram showing the structure of the sliding terminal 21. As shown in FIG. 4 is a cross-sectional view of the xz plane for explaining the operation of the sliding terminal 21 of the sliding portion 25, the connection terminal 15 covered with the sliding terminal 21, or the additional connection terminal 20. Fig. 4(a) is a diagram immediately after inserting the connection terminal 15 or the additional connection terminal 20 into the sliding terminal 21, and Fig. 4(b) shows that the connection terminal 15 or the additional connection terminal 20 is moved inside the sliding terminal 21 to make A diagram showing a state where the cable between the leading end guide tube 13 and the additional guide tube 14 connected thereto, or the cables between the two additional guide tubes 14 connected to each other are firmly connected. [Fig. 5] is a schematic diagram showing the structure of the locking portion 28. [Fig. Fig. 6 is a schematic diagram illustrating the connection between the distal guide tube 13 and the additional guide tube 14 in the xz plane. Fig. 6(a) is a schematic diagram showing the distal guide tube 13, Fig. 6(b) is a schematic diagram showing the additional guiding tube 14, and Fig. 6(c) is a schematic diagram showing the distal guiding tube 13 and the additional guiding tube 14 are connected Schematic diagram of its state. Fig. 7 is a schematic diagram showing the cross-sectional structure of the yz plane of the distal guide tube 13 and the additional guide tube 14. Fig. 7(a) is the I-I arrow view of Fig. 6(a), which is viewed from the +x axis direction. Fig. 7(b) is a view of the II-II arrow of Fig. 6(a), which is a view viewed from the +x axis direction. Fig. 7(c) is a view of arrow III-III of Fig. 6(b), which is a view viewed from the +x axis direction.

7: Cable

11: Rope operating device

11a: Reel for bending

11b: Reel for straightening

13: Front-end guide tube

14: Additional guide tube

14a: The first additional guide tube

14b: Second additional guide tube

14c: Third additional guide tube

16a: Bending rope

16b: Cable for straightening

17: Front end

17a: Sensor storage section

17b: Bend

17c: Photography installation

18: Body part

19: Lid

22a: An additional cable directly or indirectly connected to the bending cable 16a

22b: Additional rope directly or indirectly connected to the straightening rope 16b

23: Add body part

24: Additional cover

25: Sliding part

26: Rope guide

27: Added cable guide

29a: arm

29b: hook

30: convex end

32a: Pillar

32b: Handle

Claims (6)

A kind of guide tube is covered with a sensor for measuring the thickness of a heat transfer tube and a cable connected to the aforementioned sensor, from a tube stand arranged on one end of the central axis of the branch tube of the boiler The opening is guided to the heat transfer tube connected to the branch pipe, and is characterized by having: the sensor is housed as a releasable tip guide tube, and a first additional that can be connected to the tip guide tube The guide tube, the front-end guide tube, is provided with: a cable with the connecting terminal arranged at one end; a front-end portion, which is fixed with the other end of the aforementioned cable and bendable; Rod-shaped and a cross-section in a substantially U-shaped shape; and a cover portion that fixes the cable on the surface so that it can advance and retreat, and is fitted into the body portion from the inner surface, the first additional guide tube includes: an additional cable, which An additional connection terminal is arranged at one end, and a sliding terminal is arranged at the other end; an additional body part, which is rod-shaped and a cross-section roughly in the shape of a letter; an additional cover part, which fixes the aforementioned additional cable on the surface so that it can advance and retreat, and Fitted to the additional main body from the inner surface; and a sliding part arranged on the surface of the additional cover to restrict the movement of the sliding terminal to only advance and retreat a predetermined distance in the longitudinal direction of the additional cover, The connecting terminal is connected to the sliding terminal, the sensor is housed in the front end portion, the other end of the main body is connected to one end of the additional main body, and the inside of the main body and the additional main body are arranged There is the aforementioned cable, and the aforementioned cover portion and the aforementioned additional cover portion are respectively fitted into the aforementioned main body portion and the aforementioned additional main body portion, thereby integrating the distal end guide tube and the first additional guide tube into a cylindrical shape , Pulling the additional connection terminal, thereby bending the front end portion. The guide tube according to claim 1, wherein the sliding terminal has an opening, the connecting terminal is inserted into the opening, and the connecting terminal is housed in the sliding terminal, thereby connecting the connecting terminal to the sliding terminal Terminal. The guide tube according to claim 2, wherein the cover is moved in the longitudinal direction of the main body to be fitted to the main body, and the additional cover is moved in the longitudinal direction of the additional main body to thereby It is fitted to the additional main body part, and the additional cover part is brought into contact with the cover part to be fitted to the additional main body part, thereby preventing the cover part from being separated from the main body part. The guide tube according to claim 3, further comprising a mandrel and an insertion hole fitted to each other, the other end of the body part is provided with one of the mandrel and the insertion hole, and one end of the additional body part is provided with the other , It is further provided with a concave portion and a convex portion fitted with each other, the other end of the main body portion is provided with one of the concave portion and the convex portion, one end of the additional main body portion is provided with the other, and the arm and hook of a snap lock are further provided, the main body The other end of the part is provided with one of the arm and the hook, and one end of the additional body part is provided with the other. After the mandrel and the insertion hole, and the recess and the protrusion are fitted, the arm is hooked to the hook The buckle lock is locked, thereby connecting the other end of the main body to one end of the additional main body. The guide tube according to claim 4, further comprising: a second additional guide tube, which has the same structure as the first additional guide tube, and is connected to the first additional guide tube integrated with the front end guide tube. An additional guide tube; and a cable operating device, wherein the other end of the additional main body of the first additional guide tube includes: the mandrel, the insertion hole, the concave part, the convex part, the arm, and the hook, Equipped with a structure at the other end of the main body, similar to the connection between the other end of the main body and one end of the additional main body of the first additional guide tube, the additional main body of the first additional guide tube The other end is connected to one end of the additional main body of the second additional guide tube, the cable is arranged inside the additional main body of the second additional guide tube, and the additional of the second additional guide tube The cover is in contact with the front The additional cover of the first additional guide tube is fitted into the additional main body of the second additional guide tube, thereby preventing the additional cover of the first additional guide tube from being removed from the first additional guide tube. Separate the additional main body part, and integrate the front end guide tube, the first additional guide tube, and the second additional guide tube into a cylindrical shape. The sliding terminal of the second additional guide tube Inside, the additional connection terminal of the first additional guide tube is housed and connected, and the additional connection terminal of the second additional guide tube is directly or indirectly pulled by the cable operating device, thereby bending the front end portion. The guide tube according to any one of claims 1 to 5, wherein the front-end guide tube further includes a pillar portion having a pillar that can be rotated and retractable near one end of the main body portion, Column sleeves are respectively arranged at both ends of the pillars, and the pillars are arranged to be substantially parallel to the central axis when the distal guide tube is inserted into the opening of the tube base, and the distal guide tube is inserted into the After the branch pipe, it is rotated to become a substantial right angle to the central axis, and the column sleeve is extended to contact the branch pipe.

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