JP7433109B2 - Pipe unevenness measurement device and pipe unevenness measurement method - Google Patents

Description

The present invention relates to an intra-pipe unevenness measuring device and an intra-pipe unevenness measuring method for measuring the height of uneven portions on the inner surface of a pipe.

For example, Patent Document 1 describes a device for measuring the inner diameter of a tube. With this device, the inner diameter of the tube is measured by bringing the probe into contact with the inner surface of the tube.

Japanese Patent Application Publication No. 2012-58056

There may be irregularities (for example, wrinkles in the lining material) on the inner surface of the tube. There is a need for a device that can measure the height of such uneven portions on the inner surface of a tube. The contact described in this document has a thick tip and is not suitable for measuring the height of an uneven portion.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an intra-pipe unevenness measuring device and an intra-pipe unevenness measuring method that can easily measure the height of uneven portions on the inner surface of a pipe.

The pipe internal unevenness measuring device measures the height of the uneven parts on the inner surface of the pipe. The in-pipe unevenness measuring device includes a main body having a central axis, a centering part, a measuring part, and a rotating part. The centering portion expands and contracts with respect to the main body in a direction perpendicular to the main body axis, and brings the center axis of the main body closer to the center axis of the tube. The measuring section is attached to the main body so as to be rotatable about the central axis of the main body. The rotating section rotates the measuring section with respect to the main body section. The measuring section includes a base section, a measuring tip, and a measuring tip driving section. The base portion is rotatably attached to the main body portion. The measuring element is attached to the base part so as to be movable in a direction perpendicular to the axis of the main body part. The measuring element driving section drives the measuring element in a measuring element moving direction that is a moving direction of the measuring element relative to the base part and is perpendicular to the axis of the main body part. The measuring section is configured to measure the position of the measuring tip in the moving direction of the measuring tip with respect to the base section when the measuring tip comes into contact with the inner surface of the tube. The probe includes a probe base and a contact portion. The probe base is attached to the base. The contact portion is fixed to the probe base and is capable of contacting the inner surface of the tube. The contact portion extends from the probe base toward the outer side in the probe moving direction and in the direction perpendicular to the axis of the main body. The longitudinal direction of the contact portion is the moving direction of the probe. The maximum width of the contact portion in the direction perpendicular to the measuring stylus moving direction is narrower than the maximum width of the measuring stylus base in the direction perpendicular to the measuring stylus moving direction.

With the above configuration, the height of the uneven portion on the inner surface of the tube can be easily measured.

FIG. 2 is a diagram showing a state in which an intra-pipe unevenness measuring device 20 according to the first embodiment is arranged inside a pipe 10. FIG. FIG. 2 is a diagram showing a state in which the centering portion 30 of the intra-tube unevenness measuring device 20 shown in FIG. 1 is reduced in an axis-perpendicular direction R. FIG. FIG. 2 is a view corresponding to FIG. 2 showing a state in which the centering portion 30 shown in FIG. 2 is expanded in the axis-orthogonal direction R; FIG. 2 is a diagram of the intra-pipe unevenness measuring device 20 shown in FIG. 1 viewed from the rear side Zr in the axial direction. FIG. 5 is a view corresponding to FIG. 4 showing a state in which the probe 60 shown in FIG. 4 is in contact with the inner surface 10a. FIG. 6 is a view corresponding to FIG. 5 when the tube 10 shown in FIG. 5 has an eccentric portion 15. It is a figure when the measuring element 60 of the measuring part 50 shown in FIG. 1 is in a stored state. FIG. 7 is a diagram corresponding to FIG. 7 showing a state in which the probe 60 shown in FIG. 7 has advanced to the advancing side Sa. FIG. 8 is a view taken along arrow F9 of the measurement unit 50 shown in FIG. 7. FIG. FIG. 9 is a view taken along arrow F10 of the measurement unit 50 shown in FIG. 8; FIG. 8 is a view taken along arrow F11 of the measurement unit 50 shown in FIG. 7; 5 is a diagram schematically showing the inner surface 10a of the tube 10 shown in FIG. 4. FIG. FIG. 6 is a diagram corresponding to FIG. 6 of the second embodiment. FIG. 8 is a diagram corresponding to FIG. 8 of the third embodiment. It is a view corresponding to FIG. 9 of the third embodiment, and a view taken along arrow F15 in FIG. 14. FIG. 14 is a diagram corresponding to FIG. 14 of the fourth embodiment. It is a view corresponding to FIG. 15 of the fourth embodiment, and a view taken along arrow F17 in FIG. 16.

Referring to FIGS. 1 to 12, an explanation will be given of the intra-pipe unevenness measuring device 20 of the first embodiment, the pipe 10 that is the measurement target of the intra-pipe unevenness measuring device 20, and the camera 19 used for measurement.

As shown in FIG. 1, the pipe 10 is an object to be measured by the intra-pipe unevenness measuring device 20. A camera 19 and an intra-tube unevenness measuring device 20 are arranged inside the tube 10 . The pipe 10 is, for example, a water pipe, and is, for example, a sewer pipe. For example, as shown in FIG. 6, the pipe 10 is an existing pipe 10p with a rehabilitation material 10l (lining material) pasted on the inner circumferential surface thereof. Note that the pipe 10 does not need to have the rehabilitation material 10l. The inner diameter (diameter) of the tube 10 is so small that an operator cannot enter the tube 10. As shown in FIG. 4, the inner surface 10a of the tube 10 includes an arcuate portion 11 and an uneven portion 13. The tube 10 may include an eccentric portion 15 (see FIG. 6).

The arcuate portion 11 has an arcuate shape when viewed from the axial direction of the tube 10. Since the inner surface 10a of the tube 10 has irregularities, the "center axis of the tube 10" is the center axis of the arcuate portion 11, and for example, the "inner diameter of the tube 10" is the inner diameter of the arcuate portion 11. The uneven portion 13 includes at least one of a convex portion 13a and a concave portion 13b. The convex portion 13a is a portion that protrudes from the arcuate portion 11. As shown in FIG. 1, the convex portion 13a is, for example, a wrinkle in the rehabilitation material 10l (see FIG. 6), may be a wrinkle (vertical wrinkle) extending in the axial direction of the pipe 10, or may be a wrinkle extending in the circumferential direction of the pipe 10. (Horizontal wrinkles) is fine. The convex portion 13a may be a protruding portion other than a wrinkle. These wrinkles occur, for example, on the inner surface of the rehabilitation material 10l when lining the inner surface of the existing pipe 10p shown in FIG. 6 with a hose-shaped rehabilitation material 10l (lining material). As shown in FIG. 4, the recessed portion 13b is a recessed (sunk) portion relative to the arcuate portion 11. As shown in FIG. For example, when at least a portion of the pipe 10 is made of concrete, the recessed portion 13b is a portion formed by scraping the concrete with sulfuric acid generated by bacteria. The uneven portion 13 shown in FIG. 6 may be a step between the connected existing pipes 10p, or may be a gap. The eccentric portion 15 is arranged closer to the central axis of the tube 10 than the arc of the circular arc portion 11 . For example, the eccentric portion 15 is a portion (wrapped portion) where the rehabilitation materials 10l are overlapped.

The camera 19 (tube television camera) photographs the inner surface 10a and the tube unevenness measuring device 20, as shown in FIG. The camera 19 photographs the indicated value of the measuring tip 60, which will be described later. Camera 19 acquires a two-dimensional image. The camera 19 may be a visible light camera, an infrared camera, or the like. The camera 19 is arranged on the rear side Zr in the axial direction (the direction will be described later) than the intra-tube unevenness measuring device 20. The camera 19 (camera car) can travel within the pipe 10, for example, can be self-propelled.

The tube internal unevenness measuring device 20 is a device that measures the height of the uneven portion 13 on the inner surface 10a of the tube 10. For example, the pipe unevenness measuring device 20 is a device that measures the height of wrinkles in the rehabilitated material 10l (see FIG. 6). The intra-pipe unevenness measuring device 20 is arranged inside the pipe 10. The pipe unevenness measuring device 20 includes a main body portion 21, a centering portion 30, a rotating portion 40 (see FIG. 2), and a measuring portion 50.

The main body portion 21 (device main body) is provided at the center of the intra-tube unevenness measuring device 20, as shown in FIG. The main body portion 21 has a shape having a longitudinal direction, and may have a polygonal shape when viewed from the axial direction Z, or may have a cylindrical shape, for example. The main body 21 has a main body central axis 21a. The axial direction Z (main body part axial direction) is the direction in which the main body part central axis 21a extends. The axial direction Z is the longitudinal direction of the main body portion 21. The axial direction Z coincides or substantially coincides with the direction in which the central axis of the tube 10 (see FIG. 1) extends. In the axial direction Z, the side (or direction) from the measurement section 50 to the main body section 21 (described later) is defined as the axial front side Zf, and the opposite side is defined as the axial rear side Zr. The axis orthogonal direction R shown in FIG. 4 (body part axis orthogonal direction) is an imaginary circle orthogonal to the main body central axis 21a, and is the radial direction of the virtual circle centered on the main body central axis 21a. The direction R perpendicular to the axis coincides or substantially coincides with the radial direction of the tube 10 (more specifically, the radial direction of the circular arc portion 11). In the axis-orthogonal direction R, the side approaching the main body central axis 21a is defined as the inner side Ri in the axis-orthogonal direction, and the side moving away from the main body central axis 21a is defined as the outer side Ro in the axis-perpendicular direction. The circumferential direction C (the circumferential direction of the main body portion) is the circumferential direction of the above-mentioned virtual circle. The circumferential direction C matches or substantially matches the circumferential direction of the tube 10 (more specifically, the circumferential direction of the arcuate portion 11).

The centering portion 30 is a portion for bringing the main body central axis 21a closer to the central axis of the tube 10 (as much as possible). The centering section 30 brings the center of rotation of the measuring section 50 relative to the main body section 21 closer to the central axis of the tube 10 . As shown in FIG. 3, the centering part 30 is attached to the main body part 21 and expands and contracts (enlarges and contracts) with respect to the main body part 21 in the direction R orthogonal to the axis. The centering section 30 includes a centering drive section 31, a connecting member 32, a guide member 33, a link mechanism 35, and an outrigger 37.

The centering drive section 31 drives the outriggers 37. The centering drive unit 31 is fixed to the main body 21 and is built into the main body 21, for example. The centering drive unit 31 may be driven by fluid pressure or by electric power (the same applies to the rotation drive unit 41 and probe drive unit 53, which will be described later). The centering drive unit 31 is, for example, a telescopic cylinder that expands and contracts in the axial direction Z, and is, for example, an air cylinder that is driven by pneumatic pressure (compressed air). In the following, a case where the centering drive section 31 is a telescopic cylinder will be described. The centering drive section 31 includes a fixing section 31a fixed to the main body section 21 and a rod 31b. The rod 31b protrudes further forward in the axial direction Zf than the fixed portion 31a. The rod 31b protrudes from the main body portion 21 toward the front side Zf in the axial direction. The rod 31b moves in the axial direction Z with respect to the fixed part 31a. A wire W shown in FIG. 1 may be attached to the rod 31b. The wire W is for pulling the intra-tube unevenness measuring device 20 toward the front side Zf in the axial direction. Note that the attachment position of the wire W to the intra-tube unevenness measuring device 20 does not have to be the rod 31b shown in FIG.

The connecting member 32 connects the centering drive section 31 and the link mechanism 35. The connecting member 32 is attached to the rod 31b. The connecting member 32 moves in the axial direction Z with respect to the main body portion 21 as the rod 31b moves in the axial direction Z.

The guide member 33 is attached to the main body part 21 so as to be slidable in the axial direction Z. The guide member 33 is attached to the connecting member 32. A plurality of guide members 33 are provided, and in the example shown in FIG. 3, two guide members are provided. The guide member 33 has a cylindrical shape, for example, and is inserted into the main body 21, for example. The guide member 33 moves in the axial direction Z relative to the main body 21 as the connecting member 32 moves in the axial direction Z relative to the main body 21 .

The link mechanism 35 converts the movement and force of the centering drive unit 31 in the axial direction Z into the movement and force of the outrigger 37 in the axial direction R. The link mechanism 35 is attached to the centering drive section 31 via the guide member 33 and the connecting member 32. The link mechanism 35 protrudes from the main body portion 21 to the outside Ro in the direction perpendicular to the axis. A plurality of link mechanisms 35 are provided, and in the example shown in FIGS. 3 and 4, they are provided at 16 locations. Note that the eight link mechanisms 35 shown in FIG. 4 are provided at two locations aligned in the axial direction Z as shown in FIG. 3, so the link mechanisms 35 are provided at 16 locations in total. The number of link mechanisms 35 may be changed in various ways (the same applies to outriggers 37). Here, one link mechanism 35 will be explained. As shown in FIG. 3, the link mechanism 35 includes a first link member 35a and a second link member 35b.

The inner side Ri portion of the first link member 35a in the direction perpendicular to the axis is rotatably (rotatably movable, rotatably movable) attached to the main body portion 21. The outer Ro portion of the first link member 35a in the direction perpendicular to the axis is rotatably attached to the outrigger 37. The inner side Ri portion of the second link member 35b in the axis orthogonal direction is rotatably attached to the guide member 33. The outer Ro portion of the second link member 35b in the axis orthogonal direction is rotatably attached to the outrigger 37, and is rotatably attached to the outer Ro portion of the first link member 35a in the axis orthogonal direction.

The outrigger 37 is capable of contacting the inner surface 10a (see FIG. 4) of the tube 10. The outrigger 37 is arranged at an outer Ro portion (outer peripheral portion) of the centering portion 30 in the axis orthogonal direction. A plurality of outriggers 37 are provided, and in the example shown in FIG. 4, eight outriggers are provided. As shown in FIG. 3, each outrigger 37 is a member that is long in the axial direction Z, for example. The outrigger 37 is movable (expandable/contractable) in the direction R orthogonal to the axis (see FIGS. 2 and 3). All outriggers 37 interlock with each other. Note that some of the plurality of outriggers 37 may move independently with respect to other outriggers 37. For example, all outriggers 37 may move independently.

The rotating section 40 rotates the measuring section 50 with respect to the main body section 21 . The rotating section 40 rotates the measuring section 50 around the main body central axis 21a. The rotating part 40 is attached to the main body part 21. The rotating section 40 includes a rotational drive section 41 and a rotating shaft 43. The rotation drive unit 41 is attached to the main body 21 and is built into the main body 21, for example. The rotation drive unit 41 is, for example, an electric motor. The rotation shaft 43 is connected to the rotation drive section 41 and the measurement section 50. Note that a gear (not shown) or the like may be provided between the rotation drive section 41 and the measurement section 50.

The measuring section 50 (measuring unit) measures the height (length in the axis orthogonal direction R) of the uneven portion 13, as shown in FIG. As will be described later, the measuring unit 50 measures the position (relative position, moving distance) of the measuring element 60 in the axis orthogonal direction R with respect to the base part 51 when the measuring element 60 contacts the inner surface 10a of the tube 10. It is configured as follows. As shown in FIG. 3, the measurement section 50 is attached to the main body section 21. The measurement unit 50 is attached to the main body 21 so as to be rotatable about the main body central axis 21a (that is, rotatable in the circumferential direction C). The measuring section 50 is a so-called head that rotates with respect to the main body section 21 . As shown in FIG. 8, the measuring section 50 includes a base section 51, a measuring point drive section 53, a measuring point 60 shown in FIG. 10, and a dimension indicating section 71.

The base portion 51 is rotatably attached to the main body portion 21 shown in FIG. As shown in FIG. 10, the base portion 51 may include a protrusion 51a. The protruding portion 51a is a portion in which a driving portion (for example, a telescoping cylinder, etc.) that moves the base portion 51 in the measuring tip width direction T (described later) with respect to the main body portion 21 is built-in. The base portion 51 (the measuring portion 50) may be movable in the probe width direction T with respect to the main body portion 21.

As shown in FIG. 8, the measuring element driving section 53 drives the measuring element 60 in a measuring element moving direction S (described later) with respect to the base part 51. The probe drive section 53 is attached to and fixed to the base section 51 . The probe drive unit 53 is driven by, for example, fluid pressure, or by pneumatic pressure (is pneumatic), and is, for example, an air cylinder. As shown in FIG. 5, the probe driving section 53 drives the probe 60 with a force that is small enough not to damage the probe 60 when it comes into contact with the inner surface 10a of the tube 10. When the probe drive unit 53 is of a pneumatic type, the probe drive unit 53 drives with a pressure low enough to prevent the probe 60 from being damaged when the probe 60 comes into contact with the inner surface 10a. When the measuring head drive section 53 shown in FIG. 8 is of a pneumatic type and at least one of the centering drive section 31 (see FIG. 3) and the rotation drive section 41 (see FIG. 3) is of a pneumatic type, compressed air is used. A pressure source may be shared. Note that, as described above, the probe drive unit 53 may be driven electrically (or may be electrically driven). In this case, the probe drive unit 53 may include a motor or a rack and pinion mechanism. The probe drive section 53 includes a probe drive section main body 53a, a guide section 53b (see FIG. 10), and an output section 53c.

The probe drive unit main body 53a is a main body portion of the probe drive unit 53, and has, for example, a rectangular parallelepiped shape. As shown in FIG. 10, the guide portion 53b is a portion that guides the movement of the output portion 53c, and is, for example, a rail. The guide portion 53b is fixed to the probe driving portion main body 53a shown in FIG. The output section 53c is a section that is driven in the measuring stylus moving direction S (described later). The output section 53c moves along the guide section 53b (see FIG. 10).

The measuring element 60 measures the height of the uneven portion 13 (see FIG. 5). The probe 60 is movably attached to the base portion 51. The direction R perpendicular to the axis and the moving direction of the probe 60 with respect to the base portion 51 is defined as the probe moving direction S. The measuring element 60 is attached to the base part 51 via the measuring element driving part 53. The probe 60 is long in the probe moving direction S (the probe moving direction S is the longitudinal direction of the probe 60). The outer side Ro in the direction perpendicular to the axis in the measuring stylus moving direction S is defined as the advancing side Sa. The opposite side of the advancing side Sa is the retreating side Sb. The direction R perpendicular to the measuring head moving direction S and perpendicular to the axis is defined as the measuring head width direction T, as shown in FIG.

The probe 60 is detachably attached to the base portion 51. The probe 60 is detachably attached to the probe drive section 53 (more specifically, to the output section 53c) (the probe 60 is of an attachment type). Specifically, for example, the probe 60 is attached and fixed to the output portion 53c by a fastening member 60a (for example, a screw member). When the measuring element 60 is removably attached to the measuring element driving section 53, it is easy to use the measuring element driving section 53 for a purpose different from driving the measuring element 60. When the measuring element 60 is detachable from the measuring element driving part 53, it is easy to use the portion other than the measuring element 60 of the intra-tube unevenness measuring device 20 shown in FIG. 5 for purposes other than measuring the height of the uneven part 13. . The above-mentioned "uses other than measuring the height of the uneven portion 13" include, for example, measuring the inner diameter of the pipe 10. As shown in FIG. 10, the probe 60 includes a probe base 61 and a contact portion 63.

The probe base 61 is attached to the base portion 51. The probe base portion 61 is a portion of the probe 60 that is attached to the base portion 51 . For example, the probe base 61 includes a plate-like portion 61a and a length measuring portion 61b. The plate-shaped portion 61a is plate-shaped, for example, rectangular. The thickness direction of the plate-like portion 61a is the axial direction Z. The longitudinal direction of the plate-like portion 61a is the measuring head moving direction S. The length measuring section 61b is a section for measuring the position of the measuring element 60 with respect to the base section 51. The length measuring section 61b is attached (for example, pasted) to the plate-like section 61a and is fixed. The length measuring part 61b is, for example, plate-shaped, and is smaller than, for example, the plate-shaped part 61a. Specifically, the length measuring section 61b is a scale having graduations.

The contact portion 63 is capable of contacting the inner surface 10a of the tube 10, as shown in FIG. As shown in FIG. 10, the contact portion 63 extends from the probe base 61 toward the outer side Ro in the direction perpendicular to the axis. The contact portion 63 is fixed to the probe base 61 and moves integrally with the probe base 61. The contact portion 63 may be provided integrally and continuously with the probe base 61, or may be separate from the probe base 61 (see contact portion 363 in FIG. 14).

The contact portion 63 has a shape that allows the distal end portion of the contact portion 63 (the part closest to the advancing side Sa) to be easily aligned with the uneven portion 13 (see FIG. 5). The contact portion 63 has an elongated shape that is long in the measuring probe moving direction S and thin in a direction perpendicular to the measuring probe moving direction S. More specifically, the longitudinal direction of the contact portion 63 is the probe moving direction S. The contact portion 63 extends long along the measuring head moving direction S. The length of the contact portion 63 in the probe moving direction S is sufficiently longer than the width of the contact portion 63 in the probe width direction T. Specifically, in the example shown in FIG. 10, the length of the contact portion 63 in the tracing stylus movement direction S is ten times or more the width of the contact portion 63 in the tracing stylus width direction T. Note that the length of the contact portion 63 in the probe moving direction S is set variously depending on the inner diameter of the tube 10 to be measured (see FIG. 5).

This contact portion 63 is thin in a direction perpendicular to the measuring probe moving direction S. More specifically, the maximum width of the contact portion 63 in the direction orthogonal to the probe moving direction S is narrower than the maximum width of the probe base 61 in the direction orthogonal to the probe moving direction S. For example, the width of the contact portion 63 in the probe width direction T is narrower than the width of the probe base 61 in the probe width direction T. Specifically, in the example shown in FIG. 10, the width of the contact portion 63 in the width direction T of the gauge head is approximately ⅕ of the width of the base portion 61 in the width direction T.

The width of this contact portion 63 (specifically, the width in the probe width direction T) gradually becomes narrower (narrower) toward the tip of the contact portion 63. The tip end of the contact portion 63 has, for example, an arc shape when viewed from the axial direction Z, for example, a circular arc shape. In this case, with the contact portion 63 in contact with the inner surface 10a of the tube 10 shown in FIG. 5, the contact portion 63 is likely to move in the circumferential direction C with respect to the inner surface 10a. Note that a ball, roller, or the like (rotating member) may be provided at the tip of the contact portion 63.

A straight line passing through the tip of the contact portion 63 and extending in the probe moving direction S passes through the main body central axis 21a. For example, when viewed from the axial direction Z, the central axis of the contact portion 63 and extending in the probe moving direction S passes through the main body central axis 21a.

The dimension indicating section 71 is a section that indicates the position of the measuring section 50 with respect to the base section 51, as shown in FIG. Specifically, the dimension indicating section 71 points to the scale of the length measuring section 61b. The dimension indicating section 71 is attached and fixed to the base section 51. The dimension indicating section 71 is, for example, a plate-like member (dimension indicating plate). The dimension indicating section 71 is detachably attached to the base section 51 (the dimension indicating section 71 is of an attachment type). Specifically, for example, as shown in FIG. 8, the dimension indicating section 71 is attached to the base section 51 by a fastening member 71a (for example, a screw member). When the dimension indicating section 71 is removably attached to the base section 51, it is easy to use the portion of the pipe unevenness measuring device 20 shown in FIG. 5 other than the dimension indicating section 71 for purposes other than measuring the height of the uneven section 13 ( (Same as measuring head 60). Note that the length measuring section 61b and the dimension indicating section 71 shown in FIG. 10 may be configured in any manner as long as they can indicate the position of the measuring stylus 60 with respect to the base section 51. For example, the length measuring section 61b may be provided on the base section 51, and the dimension indicating section 71 may be provided on the measuring tip 60.

(operation)
The intra-pipe unevenness measuring device 20 shown in FIG. 1 is configured to operate as follows.

An intra-tube unevenness measuring device 20 and a camera 19 are placed inside the tube 10 . When the pipe unevenness measuring device 20 is pulled by the wire W, it moves to the front side Zf in the axial direction. The camera 19 moves according to the movement of the intra-tube unevenness measuring device 20.

(Operation of centering section 30)
FIG. 2 shows the centering portion 30 in its most reduced state. At this time, the centering drive section 31 is in an extended state.

The operation of enlarging the centering portion 30 is performed as follows. The centering drive 31 is reduced. Specifically, the rod 31b is driven toward the rear side Zr in the axial direction with respect to the fixed portion 31a. Then, the connecting member 32 and the guide member 33 move toward the rear side Zr in the axial direction with respect to the main body portion 21 . As a result, the base end portion of the second link member 35b moves toward the rear side Zr in the axial direction with respect to the main body portion 21. On the other hand, the base end portion of the first link member 35a does not move in the axial direction Z with respect to the main body portion 21. As a result, as shown in FIG. 3, the first link member 35a and the second link member 35b are folded. Then, the outriggers 37 move (expand) outward Ro in the direction perpendicular to the axis. Then, the main body central axis 21a shown in FIG. 4 approaches the central axis of the tube 10.

When the outrigger 37 contacts the inner surface 10a of the tube 10, the expansion of the outrigger 37 is stopped. At this time, the main body central axis 21a is in a state that substantially coincides with the central axis of the tube 10. Further, the main body portion 21 is in a state of being fixed (or substantially fixed) to the tube 10. Note that the centering section 30 (outrigger 37) is contracted by an operation opposite to the operation in which the centering section 30 (outrigger 37) is expanded.

(Operation of rotating part 40)
For example, a worker confirms the position of the uneven portion 13 while viewing an image taken by the camera 19 (see FIG. 1). Then, the operator performs an operation (remote control, command) to rotationally drive the measuring section 50 so that the contact section 63 approaches the measurement target position (the uneven section 13 and its surrounding area). By this operation, the rotation drive section 41 shown in FIG. 3 rotates the measurement section 50 with respect to the main body section 21.

(Stored state of probe 60)
As shown in FIG. 4, the state in which the measuring element 60 is most retracted with respect to the base portion 51 (the state in which it is disposed on the most retracted side Sb) is defined as the "storage state" of the measuring element 60. When the measuring element 60 is in the stored state, the measuring element 60 does not contact the inner surface 10a. In this case, the intra-tube unevenness measuring device 20 can appropriately move inside the tube 10 in the axial direction Z (inserability can be ensured).

More specifically, when the probe 60 is in the stored state, the contact portion 63 does not contact the arcuate portion 11. When the probe 60 is in the stored state, even if the contact portion 63 is directed toward the convex portion 13a (even if the contact portion 63 and the convex portion 13a face each other in the axis orthogonal direction R), the contact portion 63 will not be directed toward the convex portion 13a. It is preferable that there is no contact between the contact portion 63 and the convex portion 13a, and that there is a sufficient distance between the contact portion 63 and the convex portion 13a. Note that when the contact portion 63 is directed toward the convex portion 13a, even if there is not a sufficient distance between the contact portion 63 and the convex portion 13a, the contact portion 63 is separated from the convex portion 13a in the circumferential direction C. By rotating the measuring section 50 with respect to the main body section 21, the above-mentioned distance can be secured.

Specifically, for example, when the probe 60 is in the stored state, the distance (separation distance) between the arcuate portion 11 and the contact portion 63 is preferably 10 mm or more, and more preferably 20 mm or more. Here, the length from the central axis 21a of the main body part to the arcuate part 11 is defined as the length from the tip of the centering part 30 (the tip of the outrigger 37, the outer Ro end in the axis orthogonal direction) that is in contact with the inner surface 10a of the tube 10. It is equal or approximately equal to the length A in the direction R perpendicular to the axis up to the central axis 21a of the section. Also, when the measuring element 60 is in the stored state, in the axis orthogonal direction R from the tip of the measuring element 60 (more specifically, the tip of the contact portion 63, the outer end Ro in the axis orthogonal direction) to the main body central axis 21a. Let the length be B. At this time, the value obtained by subtracting B from A (AB) is preferably 10 mm or more, and more preferably 20 mm or more.

In addition, when the plurality of outriggers 37 are not interlocked, the length A may differ depending on the outriggers 37. In this case, the length in the axis orthogonal direction R from the tip of the outrigger 37 closest to the contact portion 63 when viewed from the axial direction Z to the main body central axis 21a is also referred to as the length A in the above "A-B". (The same applies to the width L (see FIG. 5), which will be described later). Further, the length A in the outrigger 37 where the length A is the maximum may be the length A in the above "AB" (the same applies to the width L (see FIG. 5)).

(Operation of probe 60)
The movement of the probe 60 toward the advancing side Sa is performed as follows. The probe drive unit 53 shown in FIG. 9 drives the output unit 53c to the advancing side Sa. At this time, the output section 53c moves to the advancing side Sa while being guided by the guide section 53b. As a result, the tracing stylus 60 moves to the advancing side Sa. Then, the tip of the contact portion 63 contacts the inner surface 10a of the tube 10 (see FIG. 5). At this time, movement of the tracing stylus 60 toward the advancing side Sa is stopped. The measuring head 60 is stopped automatically or manually. For example, when the operator confirms in the image that the contact portion 63 shown in FIG. 5 has contacted the inner surface 10a while looking at the image taken by the camera 19 (see FIG. 1), the operator stops the measuring tip 60. You may do so. For example, a sensor (not shown) may detect the load generated when the contact portion 63 contacts the inner surface 10a. Then, when the load detected by the sensor exceeds a predetermined value, the probe 60 may be stopped automatically or manually. For example, this sensor may be one that detects fluid pressure when the probe drive unit 53 shown in FIG. 10 is driven by fluid pressure, or one that detects current or the like when the probe drive unit 53 is electric But that's fine. Note that the movement of the tracing stylus 60 toward the retreating side Sb is performed by an operation opposite to the operation of moving the tracing stylus 60 toward the advancing side Sa.

It is preferable that the probe driving section 53 drives the probe 60 using air pressure. In this case, compared to the case where the probe drive unit 53 is driven by electric power or oil pressure, for example, it is easier to reduce the impact that the probe 60 receives when it comes into contact with the inner surface 10a shown in FIG. 5. Therefore, damage to the probe 60 can be suppressed.

(Obtaining indicated value)
As shown in FIG. 10, a value indicating the position of the probe 60 relative to the base portion 51 in the probe moving direction S when the tip of the contact portion 63 is in contact with the inner surface 10a of the tube 10 (see FIG. 5). (indication value) is obtained. For example, the indicated value may be obtained by an operator visually reading the scale value of the length measuring section 61b (60 mm in the example shown in FIG. 10) from an image taken by the camera 19 (see FIG. 1). good. Further, a sensor (not shown) may be provided to detect the position of the probe 60 with respect to the base portion 51, and the instruction value may be obtained from the detected value of this sensor. As shown in FIG. 5, the indicated value when the tip of the contact portion 63 contacts the end 13a1 (described later) is referred to as the "indicated value at the end 13a1" (the same applies when the tip contacts other parts). ).

The measuring stylus 60 is moved so that the required indicated value can be obtained. More specifically, the measurement unit 50 is rotated relative to the main body 21 and the measuring stylus 60 is moved in the measuring stylus moving direction S relative to the base portion 51 so as to obtain a necessary indicated value. For example, the operator may operate the probe 60 so that the tip of the contact portion 63 contacts the measurement target position while viewing an image taken by the camera 19 (see FIG. 1).

When the uneven portion 13 extends in the axial direction Z (for example, when the protruding portion 13a is vertically wrinkled), the measurement unit 50 is rotated while the tip of the contact portion 63 is kept in contact with the inner surface 10a, and the unevenness of the inner surface 10a is measured. The contact portion 63 may be moved in the circumferential direction C and in the probe moving direction S so as to be along the . When the uneven portion 13 extends in the circumferential direction C (for example, when the protruding portion 13a is horizontally wrinkled) (see the protruding portion 13a on the right side in Fig. 1), it is necessary to measure the unevenness in the pipe in order to obtain the necessary indicated value. The device 20 is moved in the axial direction Z.

(Moveable amount of probe 60)
The movable amount (drivable displacement amount) of the measuring tip 60 in the measuring tip moving direction S with respect to the base portion 51 shown in FIG. 5 may be set so that the height of the uneven portion 13 can be appropriately measured. preferable.

[Setting Example 1] Specifically, for example, when the inner diameter of the tube 10 is 300 mm or less, it may be necessary to measure the height of the convex portion 13a having a height of 6 mm or less. In this case, the movable amount of the probe 60 with respect to the base portion 51 needs to be 6 mm or more. Here, the inner diameter of the tube 10 is equal or approximately equal to the width L, which is twice the length A described above. Therefore, when the width L is 300 mm or less, the movable amount of the measuring stylus 60 relative to the base portion 51 in the measuring stylus moving direction S (in the axis orthogonal direction R) is set to 6 mm or more.

[Setting Example 2] For example, when the inner diameter of the tube 10 exceeds 300 mm, it may be necessary to measure the height of the convex portion 13a having a height of 2% or less of the inner diameter of the tube 10. In this case, the movable amount of the probe 60 with respect to the base portion 51 needs to be 2% or more of the inner diameter of the tube 10. Therefore, when the width L exceeds 300 mm, the movable amount of the tracing stylus 60 in the tracing stylus moving direction S with respect to the base portion 51 is set to 2% or more of the width L.

(Measurement target position, calculation method)
The height of the uneven portion 13 can be measured and calculated in various ways. When the uneven portion 13 is a convex portion 13a, the indicated value is measured at at least one of both ends 13a1 and 13a2 of the convex portion 13a and the top portion 13a3 (predetermined portion) of the convex portion 13a. Preferably, the indicated value is measured at each of the ends 13a1 and 13a2 of the convex portion 13a and the top portion 13a3 of the convex portion 13a. The height of the uneven portion 13 may be calculated by a computer external to the pipe unevenness measuring device 20, by a computer installed in the pipe unevenness measuring device 20, or by an operator. . Note that depending on the shape of the contact portion 63 and the shape of the convex portion 13a, it may not be possible to bring the tip of the contact portion 63 into contact with both ends 13a1 and 13a2 of the convex portion 13a. In this case, the instruction value at the arcuate portion 11 near both ends 13a1 and 13a2 may be the instruction value at both ends 13a1 and 13a2.

A specific example of a method for calculating the height of the convex portion 13a is as follows. [Example A1] The height of the convex portion 13a may be the difference between the indicated value at one of the end portions 13a1 and 13a2 and the indicated value at the top portion 13a3. [Example A2] Preferably, the height of the convex portion 13a is the difference between the average value of the indicated values at both end portions 13a1 and 13a2 and the indicated value at the top portion 13a3.

When the uneven portion 13 is a recess 13b, the indicated value is measured at at least one of the ends 13b1 and 13b2 of the recess 13b and the bottom 13b3 (predetermined portion) of the recess 13b. Preferably, the indicated value is measured at both ends 13b1 and 13b2 of the recess 13b and at the bottom 13b3 of the recess 13b.

A specific example of a method for calculating the height of the recessed portion 13b is as follows. [Example B1] The height (depth) of the recess 13b may be the difference between the indicated value at either end 13b1 or 13b2 and the indicated value at the bottom 13b3. [Example B2] Preferably, the height of the recess 13b is the difference between the average value of the indicated values at both ends 13b1 and 13b2 and the indicated value at the bottom 13b3.

(When the main body central axis 21a coincides with the central axis of the tube 10)
The reason why the above [Example A2] and [Example B2] are preferable is as follows. For example, when the inner surface 10a is close to a perfect circle when viewed from the axial direction Z, such as when there is no eccentric part 15 shown in FIG. 6 or when the height of the eccentric part 15 is negligibly low, 21a coincides or substantially coincides with the central axis of the tube 10. In this case, theoretically, the height of the uneven portion 13 can be measured without error at any position in the circumferential direction C (whatever the rotation angle of the measurement unit 50 is).

A specific example will be explained with reference to FIG. 12. For example, it is assumed that the deviation a of the main body central axis 21a with respect to the central axis of the tube 10 is 0 mm, the inner diameter d (diameter) of the tube 10 is 300 mm, and the height h of the convex portion 13a is 20 mm. At this time, lengths r1 and r2 from the main body center axis 21a to both ends 13a1 and 13a2 of the convex portion 13a are both 150 mm (that is, 1/2 of the inner diameter d). The length i from the main body central axis 21a to the top 13a3 of the convex portion 13a is 130 mm. Then, the size of the difference (r1-i) between length r1 and length i is 20 mm, which coincides with the height h of the convex portion 13a (difference between length r2 and length i (r2-i)). The same applies to the size of i).

In the example shown in FIG. 9, the scale (an example of the indicated value) of the length measuring section 61b is 0 when the measuring stylus 60 is disposed at the most backward position Sb. Therefore, the values on the scale of the length measuring section 61b do not match the values of the lengths r1, r2, and i based on the main body central axis 21a shown in FIG. 12. On the other hand, the difference in the indicated value of the length measuring section 61b shown in FIG. 9, for example, the difference between the indicated value at the end 13a1 and the indicated value at the top 13a3 shown in FIG. This corresponds to the difference in length based on , for example, the difference between length r1 and length i.

(When the main body center axis 21a is shifted from the center axis of the tube 10)
As shown in FIG. 6, when the inner surface 10a is not a perfect circle when viewed from the axial direction Z, such as when the height of the eccentric portion 15 is too high to ignore, the main body central axis 21a is deviates from the For example, when some of the plurality of outriggers 37 come into contact with the eccentric portion 15, the main body central axis 21a is displaced with respect to the central axis of the tube 10. Then, in the calculation method as in [Example A1] above, an error occurs in the height of the uneven portion 13. On the other hand, in the above [Example A2] and [Example B2], the error can be reduced.

A specific example will be explained with reference to FIG. 12. For example, assume that the deviation a is 20 mm, the inner diameter d is 300 mm, and the height h is 20 mm. At this time, the length r1 is 153.94 mm, and the length r2 is 148.67 mm. The length i is 131.53 mm. Then, r1-i is 22.41 mm, which causes an error of +2.4 mm with respect to the height h (=20 mm) of the convex portion 13a. Further, r2-i is 17.14 mm, which causes an error of -2.9 mm with respect to the height h (=20 mm) of the convex portion 13a.

On the other hand, by using the average value of lengths r1 and r2, the above error can be reduced. Specifically, (r1+r2)÷2-i is 19.78 mm, which is an error of -0.22 mm with respect to the height h (=20 mm) of the convex portion 13a. Similarly, if the deviation a is 10 mm, the above error will be -0.05 mm. If the deviation a is 30 mm, the above error will be -0.50 mm. If the deviation a is 40 mm, the above error will be -0.87 mm. When obtaining the indicated value by reading the scale at 1 mm intervals on the length measuring section 61b shown in FIG. 9 from the image taken by the camera 19 (see FIG. 1), an error of less than 1 mm can be said to be within the permissible range. .

(effect)
The effects of the pipe unevenness measuring device 20 shown in FIG. 1 are as follows.

(Effect of the first invention)
The tube internal unevenness measuring device 20 measures the height of the uneven portion 13 on the inner surface 10a of the tube 10. The in-pipe unevenness measuring device 20 includes a main body portion 21, a centering portion 30, a measuring portion 50, and a rotating portion 40 shown in FIG. The main body 21 has a main body central axis 21a. The centering portion 30 expands and contracts in the direction R perpendicular to the axis of the main body 21 (direction perpendicular to the axis of the main body), and brings the central axis 21a of the main body closer to the central axis of the tube 10 (see FIG. 1). The measurement unit 50 is rotatably attached to the main body 21 about the main body central axis 21a. The rotating section 40 rotates the measuring section 50 with respect to the main body section 21 . As shown in FIG. 8, the measuring section 50 includes a base section 51, a measuring stylus 60, and a measuring stylus driving section 53. The base portion 51 is rotatably attached to the main body portion 21. The probe 60 is attached to the base portion 51 so as to be movable in the direction R perpendicular to the axis. The probe driving section 53 drives the probe 60 in the probe moving direction S. The tracing stylus moving direction S is the moving direction of the tracing stylus 60 with respect to the base portion 51, and is the direction R perpendicular to the axis. As shown in FIG. 5, the measurement unit 50 is configured to measure the position of the probe 60 in the probe moving direction S with respect to the base portion 51 when the probe 60 contacts the inner surface 10a of the tube 10. . As shown in FIG. 10, the probe 60 includes a probe base 61 and a contact portion 63. The probe base 61 is attached to the base portion 51. The contact portion 63 is fixed to the probe base 61 and is capable of contacting the inner surface 10a of the tube 10 (see FIG. 5).

[Structure 1] The contact portion 63 extends from the probe base 61 in the probe moving direction S and in the outer side Ro in the axis orthogonal direction. The longitudinal direction of the contact portion 63 is the probe moving direction S. The maximum width of the contact portion 63 in the direction orthogonal to the probe moving direction S is narrower than the maximum width of the probe base 61 in the direction orthogonal to the probe moving direction S.

In the above [Structure 1], the contact portion 63 that contacts the inner surface 10a of the tube 10 shown in FIG. 5 has an elongated shape. Therefore, compared to the case where the contact part 63 does not have an elongated shape like the above-mentioned [Structure 1], the tip of the contact part 63 can be easily attached to the uneven part 13 of the inner surface 10a of the tube 10 and its surrounding area. can be brought into contact. Therefore, the height of the uneven portion 13 on the inner surface 10a of the tube 10 can be easily measured.

(Effect of the second invention)
[Structure 2] As shown in FIG. 4, A is the length in the direction R perpendicular to the axis from the tip of the centering part 30 in contact with the inner surface 10a of the tube 10 to the central axis 21a of the main body part. Let B be the length in the axis orthogonal direction R from the tip of the measuring element 60 to the main body central axis 21a when the measuring element 60 is in the most retracted state (stored state) with respect to the base part 51. At this time, AB is 10 mm or more.

In the above [Configuration 2], when the probe 60 is in the stored state, the tip of the probe 60 is located at a position Ri (position in the axis orthogonal direction R) at least 10 mm inside the tip of the centering part 30 in the axis orthogonal direction R. Placed. Here, the length A is approximately equal to the radius of the inner surface 10a of the tube 10 (more specifically, the radius of the arcuate portion 11). Therefore, the tip of the probe 60 is disposed at a position R in the axis orthogonal direction that is about 10 mm or more inside Ri in the axis orthogonal direction than the arcuate portion 11 of the inner surface 10a of the tube 10. Therefore, interference of the probe 60 with the inner surface 10a can be suppressed.

(Effect of the third invention)
As shown in FIG. 5, the width L is twice the length A in the axis orthogonal direction R from the tip of the centering part 30 in contact with the inner surface 10a of the tube 10 to the main body central axis 21a.

[Configuration 3-1] When the width L is 300 mm or less, the movable amount of the tracing stylus 60 in the tracing stylus moving direction S with respect to the base portion 51 is 6 mm or more.

[Configuration 3-2] When the width L exceeds 300 mm, the movable amount of the probe 60 in the probe moving direction S with respect to the base portion 51 is 2% or more of the width L.

According to [Configuration 3-1] above, when the width L is 300 mm or less, the height of the convex portion 13a having a height of 6 mm or less can be measured. According to [Configuration 3-2] above, when the width L exceeds 300 mm, the height of the convex portion 13a having a height of 2% or less of the width L can be measured.

(Effect of the fourth invention)
The effects of the pipe unevenness measuring method using the pipe unevenness measuring device 20 are as follows. The method for measuring unevenness in a pipe includes a measuring step and a calculating step. In the measurement step, an instruction value, which is a value indicating the position of the measuring tip 60 in the measuring tip moving direction S with respect to the base portion 51 shown in FIG.・Measure at a predetermined portion (top portion 13a3) between 13a2 and 13a2.

[Configuration 4] In the calculation step, the difference between the average value of the indicated values at both ends 13a1 and 13a2 of the uneven portion 13 and the indicated value at a predetermined portion of the uneven portion 13 is calculated as the height of the uneven portion 13. do.

The above-mentioned “predetermined portion” is the top portion 13a3 when the uneven portion 13 is the convex portion 13a, and is the bottom portion 13b3 when the uneven portion 13 is the recessed portion 13b.

With [Configuration 4] described above, even if the main body central axis 21a is slightly deviated from the central axis of the tube 10, the height of the uneven portion 13 can be calculated with high accuracy.

(Second embodiment)
With reference to FIG. 13, differences from the first embodiment will be described regarding the intra-tube unevenness measuring device 220 of the second embodiment. Note that the description of the common features of the pipe unevenness measuring device 220 with the first embodiment will be omitted. Portions of the intra-tube unevenness measuring device 220 that are denoted by the same reference numerals as those in the first embodiment are common with the first embodiment. The same applies to other embodiments to be described later, with respect to omitting descriptions of common features. The in-pipe unevenness measuring device 220 includes a driving section 273 and a reaction force receiving section 275.

The drive section 273 drives the reaction force receiving section 275 with respect to the base section 51 . The drive section 273 is configured in substantially the same manner as the probe drive section 53, for example.

The reaction force receiving part 275 receives a reaction force when the measurement part 50 contacts the inner surface 10a of the tube 10. The reaction force receiving portion 275 is a portion for suppressing displacement (described later) of the main body portion 21 with respect to the tube 10. The reaction force receiving part 275 is driven in the measuring stylus moving direction S by the driving part 273. The reaction force receiving part 275 is driven by the driving part 273 so as to protrude toward the retreating side Sb (the retreating side Sb of the measuring stylus 60) with respect to the base part 51. When the measuring stylus 60 is driven toward the advancing side Sa with respect to the base portion 51, the reaction force receiving portion 275 is driven toward the retreating side Sb with respect to the base portion 51 (in conjunction with the measuring stylus 60), for example. Note that the reaction force receiving portion 275 does not need to be interlocked with the measuring element 60. The reaction force receiving part 275 may be detachable from the driving part 273 (similar to the attachment of the measuring element 60 to the measuring element driving part 53). The reaction force receiving portion 275 includes a cushion portion 275a. The cushion portion 275a is capable of contacting the inner surface 10a of the tube 10. The cushion portion 275a is, for example, an elastic member, such as an elastomer, such as rubber.

(operation)
When the inner surface 10a is not a perfect circle when viewed from the axial direction Z, and when the positions of the plurality of outriggers 37 in the axis orthogonal direction R are linked, only a part of the plurality of outriggers 37 may come into contact with the inner surface 10a. be. Further, a force (reaction force on the retreating side Sb) in the opposite direction to the direction in which the measuring stylus 60 pushes the inner surface 10a (advancing side Sa) acts on the main body section 21 via the measuring section 50. Then, the main body portion 21 may shift toward the retreating side Sb with respect to the tube 10. This deviation increases as the angle between the direction in which the outrigger 37 in contact with the inner surface 10a extends (vertical direction in FIG. 13) and the probe moving direction S increases (closer to 90°) when viewed from the axial direction Z. ) is likely to occur. Therefore, the reaction force receiving portion 275 contacts a portion of the inner surface 10a on the opposite side in the axis orthogonal direction R to the portion contacted by the contact portion 63. Thereby, the reaction force receiving portion 275 supports the reaction force on the retreating side Sb. Therefore, displacement of the main body portion 21 with respect to the tube 10 in the direction R orthogonal to the axis is suppressed.

Note that even if the main body 21 is misaligned with respect to the tube 10, if the position of the main body 21 with respect to the tube 10 is constant or approximately constant when measuring both ends 13a1 and 13a2 and the top 13a3 of the convex portion 13a, , there is no problem with the measurement results of the height of the convex portion 13a. The same applies to the recess 13b. Therefore, the reaction force receiving part 275 does not need to be provided.

(Third embodiment)
With reference to FIGS. 14 and 15, differences between the pipe unevenness measuring device 320 of the third embodiment and the first embodiment will be described. The differences are in the probe base 361, contact portion 363, relay member 365, etc.

In the example shown in FIG. 8, the probe base 61 had a single plate shape. On the other hand, as shown in FIG. 14, in this embodiment, the probe base 361 has an L-shaped plate shape. The probe base 361 includes a length measuring portion 61b (similar to the first embodiment), a portion 361a extending in the probe moving direction S, and a portion 361c extending from the advancing side Sa end of the portion 361a to the front side Zf in the axial direction. Equipped with.

The configuration (number of parts, length, shape, etc.) of the contact portion 63 shown in FIG. 10 may be variously changed depending on the inner diameter of the tube 10 (see FIG. 4). In the example shown in FIG. 8, the thickness of the contact portion 63 in the axial direction Z was constant from the base end to the distal end of the contact portion 63. On the other hand, as shown in FIG. 14, in this embodiment, the width (thickness) of the tip member 363c in the axial direction Z becomes smaller (thinner) toward the tip of the tip member 363c.

In the example shown in FIG. 10, the contact portion 63 is configured integrally with the probe base 61. On the other hand, as shown in FIG. 15, in this embodiment, the contact portion 363 is separate from the probe base 361. The contact portion 363 is fixed to the probe base 361 via a relay member 365.

The relay member 365 is fixed to a portion 361c of the probe base 361, and protrudes from the portion 361c toward the advancing side Sa. The relay member 365 can be attached to and detached from the probe base 61 using, for example, a screw. The contact portion 363 extends from the relay member 365 to the advancing side Sa. The contact portion 363 can be attached to and detached from the relay member 365 using, for example, a screw. Note that, depending on the inner diameter of the pipe 10 (see FIG. 5), a plurality of relay members 365 may be provided, or no relay member 365 may be provided. The contact portion 363 may be removable from the portion 361c, for example with a screw.

(Fourth embodiment)
With reference to FIGS. 16 and 17, differences between the intra-tube unevenness measuring device 420 of the fourth embodiment and the third embodiment will be described. The differences are in the base section 451 and the output section 453c.

The shape of the base portion 51 shown in FIG. 10 may be modified in various ways. In the example shown in FIG. 10, the base portion 51 includes the protruding portion 51a, but the base portion 451 of this embodiment shown in FIG. 17 does not include the protruding portion 51a (see FIG. 10).

The configuration (for example, shape) of the probe driving section 53 shown in FIG. 8 may be any configuration as long as it can drive the probe 60. For example, in the example shown in FIG. 8, the output section 53c is L-shaped when viewed from the measuring tip width direction T, and is arranged on the rear side Zr and the advancing side Sa in the axial direction with respect to the measuring tip driving section main body 53a. . On the other hand, as shown in FIG. 16, in the present embodiment, the output section 453c is I-shaped when viewed from the probe width direction T, is arranged on the advance side Sa with respect to the probe drive section main body 53a, and is axially It is not arranged on the rear side Zr in the direction.

(Modified example)
Each of the above embodiments may be modified in various ways. For example, components of different embodiments may be combined. For example, the arrangement and shape of each component may be changed. For example, the number of components may be changed or some of the components may not be provided. For example, the components may be fixed or connected to each other directly or indirectly. For example, what has been described as a plurality of mutually different members or parts may be considered as one member or part. For example, what has been described as one member or portion may be divided into a plurality of different members or portions.

10 Pipe 10a Inner surface 13 Uneven part 13a3 Top part 13b3 Bottom part 20, 220, 320, 420 In-pipe unevenness measuring device 21 Main body part 21a Main part central axis 30 Centering part 40 Rotating part 50 Measuring part 51, 451 Base part 53 Measuring head drive part 60 Measuring element 61, 361 Measuring element base 63, 363 Contact part R Direction perpendicular to the axis (direction perpendicular to the axis of the main body)
Ro Outside in the direction perpendicular to the axis (outside in the direction perpendicular to the axis of the main body)
S Direction of probe movement

Claims (4)

An intra-pipe unevenness measuring device that measures the height of uneven parts on the inner surface of a pipe,
a main body having a main body central axis;
a centering part that expands and contracts with respect to the main body in a direction perpendicular to the main body axis and brings the main body central axis closer to the central axis of the tube;
a measurement unit rotatably attached to the main body about a central axis of the main body;
a rotating part that rotationally drives the measuring part with respect to the main body part;
Equipped with
The measurement unit includes:
a base portion rotatably attached to the main body portion;
a measuring element attached to the base part so as to be movable in a direction perpendicular to the axis of the main body part;
a measuring element driving section that drives the measuring element in a measuring element moving direction that is a moving direction of the measuring element relative to the base part and a direction perpendicular to the axis of the main body part;
Equipped with
The measuring unit is configured to measure the position of the measuring element in the measuring element movement direction with respect to the base part when the measuring element contacts the inner surface of the tube,
The measuring head is
a probe base attached to the base;
a contact portion fixed to the probe base and capable of contacting the inner surface of the tube;
Equipped with
The contact portion extends from the probe base toward the outer side in the probe moving direction and in the direction perpendicular to the axis of the main body,
The longitudinal direction of the contact portion is the measuring head movement direction,
The maximum width of the contact portion in the direction orthogonal to the measuring head movement direction is narrower than the maximum width of the measuring head base in the direction orthogonal to the measuring head moving direction,
The contact portion has an elongated shape that extends long along the measuring head moving direction and has a narrower width in a direction perpendicular to the measuring head moving direction than the length in the measuring head moving direction,
The width of the contact portion in the direction orthogonal to the direction of movement of the contact portion gradually becomes narrower toward the tip of the contact portion.
Pipe unevenness measuring device. The pipe unevenness measuring device according to claim 1,
The centering portion is enlarged by 10 mm or more in a direction perpendicular to the axis of the main body from a position of the tip of the probe in the direction perpendicular to the axis of the main body when the probe is in the most retracted state with respect to the base. configured to be able to
Pipe unevenness measuring device. The pipe unevenness measuring device according to claim 1 or 2 ,
When the centering width is twice the length from the tip of the centering part to the central axis of the main body in the direction perpendicular to the axis of the main body,
The centering part is configured such that the centering width is 300 mm or less, and the movable amount of the measuring stylus in the measuring stylus movement direction with respect to the base part is 6 mm or more.
or
The centering part is configured such that the centering width can be a predetermined width exceeding 300 mm, and the movable amount of the probe in the probe movement direction with respect to the base part is 2% or more of the predetermined width . is,
Pipe unevenness measuring device. A method for measuring unevenness in a pipe using the apparatus for measuring unevenness in a pipe according to any one of claims 1 to 3,
Measurement of measuring an indication value, which is a value indicating the position of the contact point in the direction of movement of the contact point with respect to the base portion, at both ends of the uneven portion and at a predetermined portion between both ends of the uneven portion. step and
a calculation step of calculating the difference between the average value of the indicated values at both ends of the uneven portion and the indicated value at the predetermined portion of the uneven portion as the height of the uneven portion;
Equipped with
The predetermined portion is a top portion when the uneven portion is a convex portion, and a bottom portion when the uneven portion is a concave portion.
Method for measuring unevenness inside a pipe.

Images