TW201837463A - Flexible tube supporting device - Google Patents

Abstract

The flexible tube supporting device (5) includes a supporting tool main body (6) installed on an outer circumference of a flexible tube inserted into a rigid tube in an axial direction of the tube, and a plurality of rollers (7) provided between the supporting tool main body (6) and the tube at intervals in a circumferential direction of the tube, rotatably installed on the supporting tool main body (6) and configured to be in contact with an inner circumferential surface of the tube, wherein the supporting tool main body (6) includes a first main body portion (11) in which a through-hole (14) having a diameter larger than an outer diameter of the flexible tube is formed, and a second main body portion (12) including a wedge portion (21) inserted into a radial gap between the through-hole (14) and the flexible tube.

Description

Supporting device for flexible pipe

The present invention relates to a support device for a flexible pipe.发明 The present invention claims priority based on Japanese Patent Application No. 2017-033296 filed in Japan on February 24, 2017, and the contents are incorporated herein by reference.

For example, in order to detect a defect in a waste incineration boiler, it is necessary to periodically measure the wall thickness of the boiler tube. As a general method for measuring the wall thickness of boiler tubes, the water immersion UT method and the like are well known.

For example, Patent Document 1 describes a technique capable of measuring the wall thickness of a boiler tube without cutting the boiler tube. In the technique described in Patent Document 1, a guide tube that guides an ultrasonic probe (sensor) for thickness measurement is used. After the guide pipe is formed as the inspection hole of the header box, the front end is introduced into the boiler tube.

Then, the ultrasonic probe connected to the sensor cable (flexible tube) is introduced into the guide tube from the inspection hole side, and the ultrasonic probe is advanced. Thereby, after the ultrasonic probe advances along the guide tube, it is guided by the guide tube and introduced into the boiler tube.

Further, Patent Document 2 describes a method in which a multi-point support roller (support device) is attached to the sensor cable in order to reduce friction between the sensor cable and the boiler tube. The multi-point supporting roller system includes: a plurality of hollow universal joints through which a sensor cable is inserted; and a plurality of rollers mounted on the outer periphery of each universal joint. Each roller is in contact with the inner surface of the tube and rolls in the direction of the tube axis. [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 4056679 [Patent Document 2] Japanese Patent Laid-Open No. 2-22552

[Problems to be Solved by the Invention]

In the multi-point support roller described in Patent Document 2, the sensor cable passing through the inside of the universal joint is formed so that a portion corresponding to the length distance of the universal joint is not bent. Therefore, the bendability of the sensor cable becomes worse (the bend radius becomes larger), and when the bend radius of the boiler tube to be inspected is small, it may be caught on the way and the sensor may not be inserted.

An object of the present invention is to provide a support device for supporting a flexible pipe (sensor cable) inserted into a rigid pipe (boiler pipe) in a direction along the axis of the pipe, and to provide a device capable of reducing the bending radius of the flexible pipe Supporting device for flexible pipes. [Means to solve the problem]

According to a first aspect of the present invention, a flexible tube support device includes a support body mounted on the outer periphery of the flexible tube, the flexible tube being inside the rigid tube so as to run along the tube. Inserted in the axial direction; and a plurality of rollers, which are arranged between the support body and the tube at intervals in the circumferential direction of the tube, and are rotatably mounted on the support body In contact with the inner surface of the tube, the support system has: a first body portion formed with a through hole formed to have a larger diameter than the outer diameter of the flexible tube; and a second body portion, It includes a wedge portion inserted in a radial direction of a gap between the through hole and the flexible tube.

According to such a configuration, the support body can be fixed to the flexible tube by inserting the wedge portion into the gap and pressing the wedge portion against the outer peripheral surface of the flexible tube. In addition, by adopting such a structure, it is possible to reduce the size in the axial direction of the supporter body to which the roller is mounted, and to reduce the bending radius of the flexible tube.

In the support device for the flexible tube, the dimension in the axial direction of the support body is smaller than an outer diameter of the roller.

According to this structure, it is possible to prevent the support body from coming into contact with the flexible tube to become frictional resistance. In addition, the flexible tube can shorten the length restricted by the support body.

In the support device for a flexible tube, the through-hole is formed in a tapered shape gradually increasing in diameter toward one side in the axial direction, and the wedge portion has a tapered outer circumference gradually increasing in diameter toward one side in the axial direction. Surface; and an inner peripheral surface having an inner diameter slightly larger than the outer diameter of the flexible tube.

According to this structure, it is possible to more easily insert the wedge portion into the gap between the through hole and the flexible tube.

In the support device for the flexible tube, the first body portion includes a bearing portion which is disposed between the rollers adjacent to each other in the circumferential direction and is formed to rotate the roller. The shaft has a groove inserted in an end portion of the shaft from the axial direction, and the second body portion includes a holding portion that holds the rotary shaft inserted into the bearing portion from the axial direction.

According to such a structure, a roller can be hold | maintained with a simpler structure. [Inventive effect]

According to the present invention, the support body can be fixed to the flexible tube by inserting the wedge portion into the gap and pressing the wedge portion against the outer peripheral surface of the flexible tube. In addition, by adopting such a structure, it is possible to reduce the size in the axial direction of the supporter body to which the roller is mounted, and to reduce the bending radius of the flexible tube.

Hereinafter, an embodiment of the tube wall thickness measuring device 1 with the support device 5 of the flexible tube of the present invention will be described in detail with reference to the drawings. (1) As shown in FIG. 1, the tube wall thickness measuring device 1 of this embodiment is used when measuring the wall thickness of the boiler tube 52 of the boiler 50. The tube wall thickness measuring device 1 measures the wall thickness of the boiler tube 52 using a sensor such as an ultrasonic probe.

The boiler 50 includes a header manifold 51 and a plurality of boiler tubes 52. The boiler tube 52 is a plurality of rigid tubes that serve as a flow path for water vapor, is arranged along the extending direction of the tube header 51 and is connected to the tube header 51 at one end. The respective boiler tubes 52 are in communication with the tube header 51 and extend to be orthogonal to the tube header 51, respectively.

In the header box 51, inspection holes 53 serving as inspection holes are separated in the extending direction of the header box 51 to form a plurality of openings. The inspection hole 53 and the boiler tube 52 are arranged in a mutually twisted positional relationship. The boiler tube 52 has a linearly extending portion and a curved portion 52a connecting the linearly extending portions to each other. The inner diameter of the boiler tube 52 is, for example, 68 mm. The radon sensor probe 2 is introduced into the boiler tube 52 through the inspection hole 53 and the tube header 51.

Next, a tube wall thickness measuring device 1 for measuring the wall thickness of the boiler tube 52 to be inspected will be described. The pipe wall thickness measuring device 1 includes: a data collection device 31; a data analysis device 32 that analyzes the data collected by the data collection device 31; a cable winding device 33 connected to the data collection device 31; The cable 30 as a flexible tube discharged from the device 33; the sensor probe 2 as a sensor installed at the front end of the cable 30; the support device 5 installed on the outer periphery of the cable 30; and the sensor The guide tube 34 of the guide device of the probe 2.

The data collection device 31 is a device that inputs the thickness data of the boiler tube 52 measured by the sensor probe 2 via the cable 30. That is, the data collection machine 31 has a function of collecting the thickness data of the boiler tube 52. The data analysis device 32 is a computer used for analyzing the thickness data of the boiler tube 52 collected by the data collection device 31.

The cable 30 is inserted into the rigid boiler tube 52 and is formed along the axial direction Da of the boiler tube 52. The cable 30 is a long flexible tube made of, for example, metal, plastic, or the like, and can be bent over its entire length. The outer diameter of the cable 30 is, for example, 12 mm. The cable 30 is provided with a data signal wiring connecting the sensor probe 2 and the data collection device 31, and a water supply hose for rotating the sensor body 3 with water pressure when measuring the wall thickness of the pipe. The radon sensor probe 2 is provided at the front end portion of the cable 30 and emits an ultrasonic wave to measure the wall thickness data of the boiler tube 52. The sensor probe 2 includes a cylindrical sensor body portion 3 and a centering mechanism 4 that holds the sensor body portion 3 at a center position in the boiler tube 52. Furthermore, the centering mechanism can also be scaled.

The cable take-up device 33 is connected to the rear end of the cable 30 to take up the cable 30 that has been inserted into the boiler tube 52.

The guide tube 34 is a tube for introducing the cable 30 and the sensor probe 2 into the boiler tube 52, and is arranged in the tube header 51 before the wall thickness of the boiler tube 52 is measured. The guide pipe 34 is arranged to connect the inspection hole 53 and the boiler pipe 52 to each other in a twisted positional relationship.

The guide tube 34 is formed of a flexible hose having a corrugated shape. Thereby, the guide tube 34 is freely expandable and contractible. The guide tube 34 is capable of maintaining a curved state when an external force is not applied when the guide tube 34 has been bent. The guide pipe 34 is inserted into the tube header 51 from the inspection hole 53, and is bent and extended in the tube header 51. The leading end of the guide tube 34 is connected to the boiler tube 52.

The supporting device 5 is a device that supports the cable 30 and reduces the friction between the cable 30 and the boiler tube 52. As shown in FIG. 2, the support device 5 supports the cable 30 so that the cable 30 is located at the center position in the radial direction of the boiler tube 52.支承 A plurality of support devices 5 are mounted near the end of the sensor probe 2 side of the cable 30 at predetermined intervals (for example, 50 mm).

As shown in FIGS. 2 and 3, the support device 5 according to this embodiment includes a support body 6 attached to the outer periphery of the cable 30 and a plurality of rollers 7 attached to the support body 6. The support body 6 is fixed to the cable 30 so as not to be movable in the extending direction of the cable 30. The plurality of rollers 7 are provided between the support body 6 and the boiler tube 52, and are provided in the circumferential direction of the boiler tube 52 at intervals. The roller 7 is a cylindrical member that is rotatably attached to the support body 6. The rotation axis 9 of the roller 7 extends in a direction orthogonal to the axis A of the cable 30, and the roller 7 rolls in the axis direction Da.

The roller 7 includes a cylindrical roller body 8 and a rotation shaft 9 formed coaxially with the axis of the roller body 8. The outer peripheral surface 8a of the roller body 8 has a circular arc shape in cross section including the axis of the roller body 8 so that the diameter gradually decreases as it goes toward the end (the end in the direction in which the rotation shaft 9 extends). The cross-sectional shape of the outer peripheral surface 8 a of the roller body 8 is formed along the inner peripheral surface of the boiler tube 52 or has a smaller radius of curvature than the radius of the inner peripheral surface of the boiler tube 52.至少 At least a part of each roller body 8 is in contact with the inner peripheral surface of the boiler tube 52.

The support body 6 includes a first body portion 11 formed with a through hole 14 (see FIGS. 4 and 5) having a larger diameter than the outer diameter of the cable 30, and a first body portion 11 inserted into the through hole 14 and the cable 30. The second body portion 12 of the wedge portion 21 (see FIG. 7) of the gap in the radial direction (see FIG. 9). The support body 6 is assembled by inserting the wedge portion 21 of the second body portion 12 into the through hole 14 of the first body portion 11 and screwing the second body portion 12 to the first body portion 11.

As shown in FIGS. 4 and 5, the first body portion 11 includes a cylindrical portion 13 in which a through hole 14 is formed, and a plurality of bearing portions 15 protruding outward from the cylindrical portion 13 in a radial direction centered on the axis A. A groove 16 is formed in the bearing portion 15. The groove 16 supports the rotation shaft 9 (see FIG. 3) of the roller 7 from the other side Da2 in the axial direction, and restricts movement of the rotation shaft 9 in the radial direction and the circumferential direction.

The bearing portion 15 has a first flat surface 15 a as a flat surface that faces the one side Da1 in the axial direction. The groove 16 is formed in the first flat surface 15 a so as to be concave toward the other side Da2 in the axial direction. A pair of grooves 16 formed in one of the bearing portions 15 adjacent in the circumferential direction are coordinated with each other to support the rotation shaft 9. Thereby, the roller 7 is arrange | positioned between the bearing parts 15 adjacent in the circumferential direction.

A plurality of screw holes 17 are formed on a surface of the cylindrical portion 13 of the first body portion 11 that faces one side Da1 in the axial direction. The screw holes 17 are formed from a surface facing one side Da1 in the axial direction and toward the other side Da2 in the axial direction.

The inner peripheral surface of the through-hole 14 has a tapered shape that gradually increases in diameter toward one side Da1 in the axial direction. In other words, the inner diameter of the through-hole 14 gradually increases toward the axial direction side Da1. The taper angle of the inner peripheral surface of the through hole 14 is, for example, 1/10 to 1/20. A margin portion 18 as a chamfer is formed at an end portion on the other side Da2 in the axial direction of the through hole 14. The shape of the margin portion 18 may be a chamfered chamfer or a round chamfer.

As shown in FIGS. 6 and 7, the second body portion 12 includes: a ring-shaped ring portion 20; and a cylindrical wedge portion 21 protruding toward the other side Da2 in the axial direction than the inner peripheral side end portion of the ring portion 20. And a plurality of holding portions 22 protruding outward from the ring portion 20 in the radial direction centered on the axis A. The cymbal holding portion 22 includes a second flat surface 22 a which is a flat surface that is in surface contact with the first flat surface 15 a of the bearing portion 15 of the first body portion 11. The second flat surface 22a is a surface facing the other side Da2 in the axial direction. A plurality of holes 23 corresponding to the screw holes 17 of the cylindrical portion 13 of the first body portion 11 are formed in the ring portion 20. The hole 23 is formed in a shape corresponding to the screw 25 to be used. In the present embodiment, a pan-shaped screw is used as the screw 25 (see FIG. 8). Therefore, a countersinking process is performed on the hole 23.

The wedge portion 21 includes a tapered outer peripheral surface 21 a that gradually increases in diameter toward one side Da1 in the axial direction, and an inner peripheral surface 21 b having an inner diameter slightly larger than the outer diameter of the cable 30 (see FIG. 2). In other words, the outer diameter of the outer peripheral surface 21a of the wedge portion 21 gradually increases as it goes toward one side Da1 in the axial direction. The taper angle of the outer peripheral surface is the same as the taper angle of the inner peripheral surface of the through hole 14 of the cylindrical portion 13 of the first body portion 11.

As shown in FIG. 9, a slit 24 is formed at an intersection between the outer peripheral surface 21 a of the wedge portion 21 and the second flat surface 22 a of the holding portion 22 so as to extend over the entire circumference in the circumferential direction. The slit 24 is formed as a groove inclined toward the axial direction side Da1 as it goes from the intersection between the outer peripheral surface 21a and the second flat surface 22a to the inside in the radial direction.

As shown in FIG. 2, the support body 6 (the first body portion 11 and the second body portion 12) has a dimension L in the axial direction Da that is smaller than a diameter D of the roller 7. For example, the diameter of the roller 7 is 14 mm, and the thickness Da in the axial direction Da of the support body is L = 13 mm.

Next, a method for assembling the support device 5 will be described. FIG. 8 is an exploded view of the supporting device 5. The assembling method of the support device 5 includes a cable insertion process of inserting the cable 30 into the through hole 14 of the first body portion 11, and inserting the rotation shaft 9 of the roller 7 into the groove 16 of the first body portion 11. A sub-rotation shaft inserting process; pressing the wedge part 21 of the second body part 12 into the wedge part pressing process between the through hole 14 of the first body part 11 and the outer peripheral surface 30a of the cable 30; and using a screw 25, The screw fixing process for fixing the first body portion 11 and the second body portion 12.

As shown in FIG. 9, the wedge portion 21 is inserted into the gap G between the inner peripheral surface of the through hole 14 and the outer peripheral surface 30 a of the cable 30 in the wedge portion press-in process. Thereby, the inner peripheral surface 21b of the wedge portion 21 is brought into surface contact with the outer peripheral surface 30a of the cable 30, and the wedge portion 21 presses the outer peripheral surface of the cable 30. (2) In the screw fixing process, the second flat surface 22a of the second body portion 12 and the first flat surface 15a of the first body portion 11 are brought into close contact with each other. Thereby, the wedge portion 21 can further bite into the gap G between the through hole 14 and the cable 30. The wedge portion 21 bites into the gap G, so that the support device 5 (support body 6) cannot move in the axial direction Da. In addition, the second flat surface 22a of the second body portion 12 covers the first flat surface 15a of the first body portion 11 in which the groove 16 is formed, so that the roller 7 is rotatably mounted.

According to the aforementioned embodiment, the support body 6 can be fixed to the cable 30 by the wedge portion 21 being inserted into the gap G between the through hole 14 and the cable 30 while the wedge portion 21 presses the outer peripheral surface 30 a of the cable 30. Moreover, by having such a structure, the dimension L (refer FIG. 2) of the axial direction Da of the supporter main body 6 with which the roller 7 was attached can be made small, and the bending radius of the cable 30 can be made small.

In addition, by making the dimension of the support body 6 in the axial direction Da smaller than the outer diameter of the roller 7, it is possible to prevent the support body 6 from coming into contact with the boiler tube 52 to cause frictional resistance. In addition, in the cable 30, the length restricted by the support body 6 can be shortened. Thereby, as shown in FIG. 10, the bending radius of the cable 30 can be reduced. The example shown in FIG. 10 is an example in which the support device 5 is attached to the cable 30 having a diameter of 12 mm so that the interval S between them becomes 50 mm. For reference, the minimum radius of curvature R of the cable 30 is 38.4 mm.

In addition, the wedge portion 21 having a shape corresponding to the shape is press-fitted into the tapered through hole 14 so that the wedge portion 21 can be more easily inserted into the gap G between the through hole 14 and the cable 30. In addition, the structure in which the groove 16 of the bearing portion 15 of the first body portion 11 is inserted into the rotation shaft 9 of the roller 7 and the rotation shaft 9 is held by the holding portion 22 of the second body portion 12 can be made simpler. Structure holding roller 7.

In addition, by forming the margin portion 18 in the first body portion 11 of the support body 6, the length of the cable 30 restrained by the support body 6 can be further shortened, and the cable 30 can be bent more easily. Furthermore, by forming a slit 24 between the wedge portion 21 and the holding portion 22 of the second body portion 12, the wedge portion 21 is easily bent. Thereby, the wedge portion 21 can be easily bitten into the gap G.

The embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and also includes design changes that do not exceed the scope of the technical idea of the present invention. In addition, in the said embodiment, although the number of the rollers 7 attached to each support device 5 was set to six, it is not limited to this. The number of the rollers 7 may be 3 or more. In addition, in the aforementioned embodiment, the wedge portion 21 is formed continuously in the circumferential direction, but it is not limited to this, and a plurality of wedge portions 21 may be provided in the circumferential direction at intervals. [Industrial availability]

According to the flexible tube support device, the flexible tube (sensor cable) support device for supporting a flexible tube (sensor cable) inserted into a rigid tube (boiler tube) along the tube axis direction can reduce the flexible tube. Bending radius.

1‧‧‧ tube wall thickness measuring device

2‧‧‧ Sensor Probe

3‧‧‧ Sensor Body

4‧‧‧ Brush

5‧‧‧ support device

6‧‧‧Support body

7‧‧‧ roller

8‧‧‧ roller body

9‧‧‧ rotation axis

11‧‧‧The first body part

12‧‧‧ The second body part

13‧‧‧ tube

14‧‧‧through hole

15‧‧‧bearing department

15a‧‧‧First flat surface

16‧‧‧ trench

17‧‧‧Screw hole

18‧‧‧ Margin Department

20‧‧‧Ring

21‧‧‧ Wedge

22‧‧‧ Holding Department

22a‧‧‧Second flat surface

23‧‧‧hole

24‧‧‧Slit section

25‧‧‧Screw

30‧‧‧cable

31‧‧‧Data Collection Machine

32‧‧‧Data Analysis Device

33‧‧‧cable winding device

34‧‧‧ Guide tube

50‧‧‧ boiler

51‧‧‧tube header

52‧‧‧boiler tube

52a‧‧‧ Bend

53‧‧‧ manhole

A‧‧‧ axis

Da‧‧‧ axis direction

Da1‧‧‧ One side in axial direction

Da2‧‧‧ axis side

FIG. 1 is an overall schematic view of a tube wall thickness measuring device and a boiler according to the embodiment of the present invention. FIG. 2 is a side view of a sensor probe and a flexible tube supporting device of a tube wall thickness measuring device according to an embodiment of the present invention. FIG. 3 is a side view of the flexible tube supporting device according to the embodiment of the present invention when viewed in the axial direction. FIG. 4 is a side view of the boiler tube viewed from the axial direction of the flexible tube support device according to the embodiment of the present invention. FIG. 5 is a sectional view taken along the line V-V in FIG. 4. FIG. 6 is a side view of the boiler tube viewed from the axial direction of the flexible tube support device according to the embodiment of the present invention. FIG. 7 is a sectional view taken along the line VII-VII in FIG. 6. FIG. 8 is an exploded view of a flexible tube supporting device according to an embodiment of the present invention. Fig. 9 is a diagram illustrating a method of assembling a flexible tube supporting device according to an embodiment of the present invention. Fig. 10 is a diagram for explaining the operation of the flexible tube supporting device according to the embodiment of the present invention.

Claims (4)

A support device for a flexible pipe, comprising: a support body mounted on the outer periphery of the flexible pipe, the flexible pipe being inside the rigid pipe to be inserted along the axis direction of the pipe; The rollers are provided between the support body and the tube at intervals in the circumferential direction of the tube, and are rotatably mounted on the support body to contact the inner peripheral surface of the tube. The support system of the present invention includes: a first body portion formed with a through hole formed to have a larger diameter than an outer diameter of the flexible tube; and a second body portion including a hole inserted into the through hole and The wedge portion in the radial direction of the gap of the flexible tube. For example, the support device for a flexible tube according to item 1 of the patent application, wherein the dimension in the axial direction of the support body is smaller than the outer diameter of the roller. For example, the support device for a flexible tube according to item 1 or 2 of the patent application, wherein the through-hole is tapered gradually increasing in diameter toward one side of the axis direction, and the wedge portion has: A tapered outer peripheral surface having an enlarged diameter; and an inner peripheral surface having an inner diameter slightly larger than the outer diameter of the flexible tube. The support device for a flexible pipe according to any one of claims 1 to 3, wherein the first body portion has a bearing portion, and the bearing portions are arranged on the rollers adjacent to each other in the circumferential direction. A groove is formed between the ends of the rotary shaft of the roller to be inserted from the axial direction. The second body portion includes a holding portion that holds the rotary shaft inserted into the bearing portion from the axial direction.