JP2017223463A - Guide for inspection cable, inspection cable, and sensor for inspection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a guide for an inspection cable capable of reducing the frictional resistance to a pipe through which a sensor for inspection passes.SOLUTION: A guide 1 for an inspection cable includes: a guide body 10 that has a spherical outer peripheral surface and has a mounting hole portion 10a through which a cable extending along an axis Ar passes; and a plurality of rotors 21 disposed at intervals along a circumferential direction Dc and an axis direction Da so as to rotate about a rotation axis 21A that crosses the axis Ar and extends along the tangential direction of the outer peripheral surface of the guide body 10. A groove portion 12 recessed from the outer peripheral surface is formed between the rotors 21 adjacent to each other in the axis direction Da, of the plurality of rotors 21.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an inspection cable guide, an inspection cable, and an inspection sensor.

  The inspection sensor has an inspection cable and an inspection probe attached to the tip of the inspection cable. The inner surface of the pipe is inspected by inserting an inspection cable with an inspection probe attached to the pipe. The inspection sensor is used as a tool for inspecting the adhesion state and corrosion state of scale (precipitate) on various industrial pipe inner surfaces.

  Patent Document 1 describes a flaw detection apparatus for a small-diameter tube in which a plurality of elliptical lumps having a plurality of sliding members on the surface are provided along a cable. Friction with the inner surface of the pipe is reduced by the sliding member, and the cable can be smoothly fed into the small diameter pipe.

JP-A-8-338829

  The nodule in the flaw detection apparatus described in Patent Document 1 has an elliptical shape and cannot be used for a pipe having a small bending radius. This is because the oval body itself becomes a cause of catching and rubbing and hinders insertion. Further, the frictional resistance cannot be sufficiently reduced only by providing the sliding member on the knob.

  An object of the present invention is to provide an inspection cable guide, an inspection cable, and an inspection sensor that can reduce frictional resistance with respect to a pipe through which the inspection sensor is inserted.

In order to solve the above problems, the present invention proposes the following means.
The inspection cable guide according to the first aspect of the present invention is an inspection cable guide used for an inspection sensor for inspecting the inside of a pipe, and a cable extending along an axis is inserted through an outer peripheral surface having a spherical shape. A guide main body formed with a mounting hole to be rotated, and rotatable about a rotation axis extending in a direction tangential to the outer peripheral surface of the guide main body and intersecting the axis, and spaced apart in the circumferential direction and the axial direction. And a groove recessed from the outer peripheral surface is formed between the rotating bodies adjacent to each other in the axial direction among the plurality of rotating bodies.

  According to such a configuration, since the groove portion recessed from the outer peripheral surface is provided between the rotating bodies adjacent in the axial direction, even when any of the rotating bodies adjacent in the axial direction is in contact with the inner surface of the pipe, It is possible to avoid the guide body from coming into contact with the inner surface of the pipe. In particular, by providing the groove at the bent portion of the pipe, the contact between the guide body and the inner surface of the pipe can be reduced. As a result, it is possible to reduce the frictional resistance when inserting the inspection cable guide into the pipe.

  In the inspection cable guide according to the second aspect of the present invention, in the first aspect, the plurality of rotating bodies includes a plurality of rotating body groups each including a rotating body existing on the same virtual circle intersecting the axis. A plurality of the rotating body groups are provided at intervals in the axial direction, and the groove portion is recessed from the outer peripheral surface between the rotating body groups adjacent in the axial direction and extends in the circumferential direction of the axial line. The structure which is may be sufficient.

  According to such a configuration, since the groove portion extends in the circumferential direction symmetrical to the axis along the rotating body group, the guide body and the inner surface of the pipe are disposed at any position in the circumferential direction around the axis of the guide body. Can avoid contact. Therefore, the frictional resistance when inserting the inspection cable guide into the pipe can be reduced.

  In the inspection cable guide according to the third aspect of the present invention, in each of the first aspect and the second aspect, the rotation axes of the plurality of rotating bodies are all one with respect to an orthogonal plane orthogonal to the axis. The structure which inclines in the direction may be sufficient.

  According to such a configuration, the inspection cable guide can be moved forward and backward while rotating around the axis. Therefore, even when there is a protruding portion such as a weld bead inside the pipe, the rotating body can be moved obliquely with respect to the protruding portion, and the protruding portion can be easily climbed over.

  In the inspection cable guide according to the fourth aspect of the present invention, in the first aspect, the plurality of rotating bodies may be spirally disposed along the outer peripheral surface about the axis.

  According to such a configuration, the inspection cable guide can be moved forward and backward while rotating around the axis. Therefore, even when there is a protruding portion such as a weld bead inside the pipe, the rotating body can be moved obliquely with respect to the protruding portion, and the protruding portion can be easily climbed over. Further, even when the inner surface of the pipe and the rotating body of the inspection cable guide are in contact with each other at a plurality of locations, a rotational force that rotates the inspection cable guide in the same direction can be obtained.

  In the inspection cable guide according to the fifth aspect of the present invention, in the first aspect to the fourth aspect, the plurality of rotating bodies have a diameter of the rotating body according to a pressure from the radial direction of the guide body. A configuration having a rotation axis capable of changing the position in the direction may also be used.

  According to such a configuration, the rotating body can also operate in the radial direction. Therefore, it can be buffered by the rotating body without transmitting the influence of the protruding portion inside the pipe to the guide body. Therefore, every time there is a projection, the guide body can be prevented from moving in the radial direction of the pipe, and contact between the guide body and the pipe can be further avoided.

  In the inspection cable guide according to the sixth aspect of the present invention, in the first to fifth aspects, the groove portion is formed apart from the rotating body in the axial direction, and is adjacent to the axial direction. The structure which has a level | step difference overpass guide part which assists the advance / retreat in the said piping of the said guide main body between the rotary body and the said groove part may be sufficient.

  According to such a configuration, it is possible to assist the climbing over the protrusion inside the pipe by the step climbing guide portion. When the guide portion over the step of the guide main body comes into contact with the protrusion inside the pipe before the rotating body, the guide main body rides on the protrusion. Thereafter, the rotating body comes into contact with the protruding portion and gets over the protruding portion. Before the rotating body comes into contact with the protruding portion, the guide body is run over the protruding portion, so that the step that needs to be overcome when the rotating body gets over the protruding portion can be reduced. As a result, even when the step of the protrusion is larger than the rotating body and it is difficult to get over the rotating body alone, it is easy to move the inspection cable guide back and forth.

  In the inspection cable guide according to the seventh aspect of the present invention, in the first to sixth aspects, the bearing is provided in the mounting hole portion of the guide main body, and the guide main body is relatively rotatable about the axis. The structure which has further may be sufficient.

  According to such a configuration, the guide main body can be relatively rotated around the axis by the bearing. Therefore, even when the guide body rotates about the traveling direction, it is possible to avoid twisting of the cable inserted through the mounting hole portion of the inspection cable guide.

  In the inspection cable guide according to the eighth aspect of the present invention, in the seventh aspect, the bearing has a fixing jig for fixing the position of the guide body in the axial direction, and in the radial direction of the guide body. A gap may be provided between the fixing jig and the guide main body, and the guide main body may be configured to be relatively rotatable around the axis about the fixing jig by the gap.

  According to such a structure, the bearing which avoids that a cable twists can be made into a simple structure.

  An inspection cable according to a ninth aspect of the present invention includes the inspection cable guide according to the first to eighth aspects, and a cable attached to the inspection cable guide.

  According to such a configuration, the inspection cable guide can avoid buckling of the inspection cable and reduce the frictional resistance between the inspection cable and the inner surface of the pipe through which the inspection cable is inserted.

  An inspection sensor according to a tenth aspect of the present invention includes the inspection cable according to the ninth aspect and an inspection probe provided on any of the inspection cables.

  According to such a configuration, since the friction resistance of the inner surface of the pipe through which the inspection cable and the inspection cable are inserted is small, the inspection probe can be sent to the back of the pipe, and the scale (precipitate) adheres to the inner surface of the pipe more easily. The situation and corrosion situation can be inspected.

  ADVANTAGE OF THE INVENTION According to this invention, the guide for inspection cables which can reduce the frictional resistance with respect to piping which penetrates the sensor for an inspection can be provided.

It is a perspective schematic diagram of the sensor for inspection in one embodiment of the present invention. It is a perspective schematic diagram of the test cable guide in the first embodiment of the present invention. It is the cross-sectional schematic diagram which cut | disconnected the guide for test | inspection cables in 1st Embodiment of this invention along the axis line. It is the cross-sectional schematic diagram which cut | disconnected the rotary body vicinity of the test cable guide in 1st Embodiment of this invention along the rotating shaft. It is a schematic diagram which shows a mode that the test | inspection cable in a comparative example is penetrated in piping. It is a schematic diagram which shows a mode that the test | inspection cable in 1st Embodiment of this invention is penetrated in piping. It is the schematic diagram which expanded the rotary body vicinity which contacts the piping inner surface in the test | inspection cable in a comparative example. In the inspection cable in 1st Embodiment of this invention, it is the schematic diagram which expanded the rotary body vicinity which contacts a piping inner surface. It is the cross-sectional schematic diagram which cut | disconnected the guide for inspection cables in 2nd Embodiment of this invention along the axis line. It is the schematic diagram which showed a mode that the test | inspection cable in 1st Embodiment of this invention passed the projection part of piping inner surface. It is the schematic diagram which showed a mode that the test | inspection cable in 2nd Embodiment of this invention passed the projection part of piping inner surface. It is a side surface schematic diagram of the guide for test | inspection cables in 3rd Embodiment of this invention. It is the cross-sectional schematic diagram which cut | disconnected the guide for test | inspection cables in 3rd Embodiment of this invention along the axis line. It is a schematic diagram for demonstrating attachment of the bearing of the guide for test | inspection cables in 3rd Embodiment of this invention. It is a schematic diagram which shows a mode that the guide for test | inspection cables in 3rd Embodiment of this invention penetrates the inside of piping. It is a schematic diagram which shows a mode that the rotary body of the inspection cable guide gets over the protrusion part inside piping. It is a side surface schematic diagram of the modification of the test cable guide in 3rd Embodiment of this invention. It is a guide side surface schematic diagram for inspection cables in a 4th embodiment of the present invention. It is a schematic diagram which shows a mode that the guide for test | inspection cables in 4th Embodiment of this invention penetrates the inside of piping.

  Hereinafter, various embodiments according to the present invention will be described in detail with reference to the drawings.

“Embodiment of inspection sensor”
One embodiment of an inspection sensor will be described with reference to FIG.

FIG. 1 is a schematic perspective view of an inspection sensor according to an embodiment of the present invention.
As shown in FIG. 1, the inspection sensor 100 according to the present embodiment includes an inspection cable guide 1, a cable 2, and an inspection probe 3. The inspection sensor 100 is inserted into the pipe, and inspects the state of scale adhesion or corrosion on the inner surface of the pipe.

  Here, each direction in the inspection sensor 100 is defined. A central axis of the cable 2 is defined as an axis line Ar, and a direction in which the axis line Ar extends is defined as an axis direction Da. The radial direction with respect to the axis Ar is simply referred to as the radial direction Dr. In addition, a side away from the axis Ar in the radial direction Dr is defined as a radially outer side, and a side approaching the axis Ar in the radial direction Dr is defined as a radially inner side. A circumferential direction with the axis Ar as a central axis is simply referred to as a circumferential direction Dc.

The inspection cable guide 1 is connected by a cable 2 to form an inspection cable as a whole. An inspection probe 3 is provided on one end side of the inspection cable.
As the inspection probe 3, a known probe can be used as long as the state of the inner surface of the pipe can be confirmed. For example, a camera, an industrial endoscope, an ultrasonic probe, or the like can be used.

  The inspection sensor 100 advances the inspection probe 3 to the depth of the pipe by feeding the inspection cable into the pipe from the end opposite to the end where the inspection probe 3 is provided. As a result, the state of the inner surface of the pipe behind the pipe can be inspected.

“First embodiment of guide for inspection cable”
A first embodiment of the inspection cable guide will be described with reference to FIGS.

  FIG. 2 is a schematic perspective view of the inspection cable guide 1 according to the first embodiment. FIG. 3 is a schematic cross-sectional view of the inspection cable guide according to the first embodiment of the present invention cut along the axis Ar. The inspection cable guide 1 has a guide body 10 and a plurality of rotating bodies 21.

  The guide body 10 is formed with a mounting hole 10a through which the outer peripheral surface is spherical and the cable 2 extending along the axis Ar is inserted. Here, the spherical shape is not limited to a true sphere, and includes an elliptic sphere, a partially cut sphere, and the like.

  The plurality of rotating bodies 21 are provided on the outer peripheral surface of the guide body 10 at intervals in the circumferential direction Dc and the axial direction Da. In FIG. 2, a plurality of rotating bodies 21 existing on the same virtual circle I orthogonal to the axis Ar at intervals in the circumferential direction Dc constitute one rotating body group 20. A plurality of the rotating body groups 20 are formed in the axial direction Da.

  Each rotating body 21 has a rotating shaft 21A and a rotating portion 21B. The rotation shaft 21A extends along the tangential direction of the virtual circle I orthogonal to the axis Ar. Each rotating body 21 rotates about a rotating shaft 21A.

  FIG. 4 is a schematic cross-sectional view of the inspection cable guide according to the first embodiment of the present invention, in which the vicinity of the rotating body is cut along the rotation axis. The rotating body 21 can change the position of the rotating body 21 in the radial direction Dr according to the pressing of the guide body 10 from the radial direction Dr. In FIG. 4, the rotating shaft 21 </ b> A is an elastic shaft having elasticity, and the rotating shaft 21 </ b> A bends when the rotating portion 21 </ b> B is pressed from the radial direction Dr. As a result, the rotating body 21 sinks inside the guide body 10.

  As shown in FIGS. 2 and 3, a groove 12 that is recessed from the outer peripheral surface of the guide body 10 is formed between the rotating bodies 21 adjacent to each other in the axial direction Da among the plurality of rotating bodies 21. In FIG. 2, the groove portion 12 is provided between the axial directions Da of the adjacent rotating body groups 20. Therefore, the groove 12 extends in the circumferential direction Dc along the rotating body group 20.

  According to the inspection cable guide 1 having the above-described configuration, it is possible to reduce the frictional resistance when the inspection cable having the inspection cable guide 1 is inserted into the pipe.

  Hereinafter, the reason why the frictional resistance when the inspection cable is inserted into the pipe can be reduced will be described while presenting a comparative example.

  FIG. 5 is a schematic diagram illustrating a state in which the inspection cable in the comparative example is inserted into the pipe. The inspection cable in the comparative example includes an inspection cable guide 1 ′ and a cable 2 through which the inspection cable guide 1 ′ is inserted.

  The inspection cable guide 1 ′ in the comparative example includes a guide body 10 ′ and a plurality of rotating bodies 21 ′ provided on the outer peripheral surface of the guide body 10 ′. The difference from the inspection cable guide 1 according to the first embodiment is that no groove is formed in the guide body 10 '.

  First, the case where the inspection cable of the comparative example is inserted into the pipe P having the bent portion Pb will be described as an example. Since the pipe P has the bent portion Pb, the inner peripheral surface Pbi on the inner peripheral side of the bent portion Pb protrudes toward the inside of the pipe. On the other hand, in the inspection cable guide 1 ′, the outer peripheral surface of the guide body 10 ′ between the adjacent rotating bodies 21 ′ protrudes outward from the axis Ar of the guide body 10 ′. Therefore, in the inner peripheral surface Pbi on the inner peripheral side in the bent portion Pb, a region R1 where the outer peripheral surface of the guide body 10 'comes into contact with the inner peripheral surface Pbi before the rotating body 21' is generated.

  The slip resistance at which the guide body 10 'slides on the inner peripheral surface Pbi is larger than the rolling resistance at which the rotating body 21' rolls on the inner peripheral surface Pbi. When both the rotating body 21 ′ and the guide body 10 ′ are in contact with the inner peripheral surface Pbi, the insertion resistance for inserting the inspection cable guide 1 ′ into the pipe is added to the rolling resistance of the rotating body 21 ′. The sliding resistance of the guide body 10 'is added. Therefore, in any case, the insertion resistance for inserting the inspection cable guide 1 'into the pipe is increased.

  On the other hand, as shown in FIG. 6, the inspection cable guide 1 according to the first embodiment has a groove 12. The groove 12 is recessed inward from the outer peripheral surface of the guide body 10. Therefore, also on the inner peripheral surface Pbi protruding toward the inside of the pipe, the rotating body 21 comes into contact with the guide body 10 before the outer peripheral surface of the guide body 10. The insertion resistance for inserting the inspection cable guide 1 into the pipe is mainly the rolling resistance of the rotating body 21, and the insertion resistance is reduced. That is, according to the inspection cable guide 1 according to the first embodiment, it is possible to reduce the frictional resistance when the inspection cable is inserted into the pipe at the bent portion Pb of the pipe P.

  Further, the frictional resistance is not limited to the bent portion, and can be reduced also in the straight pipe portion.

  FIG. 7 is an enlarged schematic view of the vicinity of the rotating body that contacts the inner surface of the pipe in the inspection cable in the comparative example. Moreover, FIG. 8 is the schematic diagram which expanded the rotary body vicinity which contacts the piping inner surface in the test | inspection cable in 1st Embodiment of this invention.

  As shown in FIG. 7, in the inspection cable in the comparative example, the outer peripheral surface 10′o of the guide body 10 ′ located between the adjacent rotating bodies 21 ′ protrudes toward the inner wall Psi of the straight pipe portion Ps. . Therefore, the inner wall Psi of the straight pipe portion Ps and the outer peripheral surface 10'o of the guide body may come into contact with the rotating body 21 '.

  Further, the position of the rotating body 21 ′ varies in the radial direction Dr according to the pressing from the radial direction Dr. Therefore, when the rotating body 21 ′ contacts the inner wall Psi, the rotating body 21 ′ sinks in the radial direction Dr of the guide main body 10 ′, and the inner wall Psi of the straight pipe portion Ps contacts the outer peripheral surface 10′o of the guide main body. It becomes easy. Therefore, also in the straight pipe portion Ps, the guide main body 10 'and the pipe P are in contact with each other, and the insertion resistance when inserting the inspection cable guide 1' into the pipe is increased.

  On the other hand, the inspection cable guide 1 according to the present embodiment has a groove 12 as shown in FIG. Therefore, the outer peripheral surface 10o of the guide body 10 positioned between the adjacent rotating bodies 21 is recessed with respect to the inner wall Psi of the straight pipe portion Ps. Therefore, the inner wall Psi of the straight pipe portion Ps and the outer peripheral surface 10o of the guide body can be prevented from contacting each other. Even when the radial position of the rotating body 21 fluctuates according to the pressing from the radial direction Dr, it is possible to avoid contact between the inner wall Psi of the straight pipe portion Ps and the outer peripheral surface 10o of the guide body by the groove portion 12.

  That is, according to the inspection cable guide 1 according to the first embodiment, even in the straight pipe portion Ps of the pipe P, the guide main body 10 and the inner wall Psi are prevented from coming into direct contact, and the inspection cable is inserted into the pipe. Frictional resistance can be reduced.

“Second embodiment of guide for inspection cable”
FIG. 9 is a schematic cross-sectional view of the inspection cable guide according to the second embodiment of the present invention cut along the axis. As shown in FIG. 9, the inspection cable guide 5 according to the second embodiment is different from the inspection cable guide 1 according to the first embodiment in that the groove 12 is formed separately from the rotating body 21. Different. As a result, the step crossing guide portion 13 that assists the advancement and retraction in the pipe of the guide main body 10 is provided between the rotating body 21 adjacent to the axial direction Da and the groove portion 12. Different from the cable guide 1. In the following description, description of common parts is omitted. Moreover, in each drawing used for description, the same code | symbol shall be attached | subjected to the same component as FIGS.

  In FIG. 9, the step climbing guide portion 13 is a portion remaining between the rotating body 21 and the groove portion 12 after the groove portion 12 is formed from the outer peripheral surface of the guide main body 10. The step climbing guide portion 13 is not limited to the configuration as long as it can exert its function. For example, the outermost surface of the step climbing guide portion 13 may be located inside the outer peripheral surface of the guide body 10.

Here, the function of the step crossing guide portion 13 will be described.
FIG. 10 is a schematic diagram illustrating a state in which the inspection cable according to the first embodiment of the present invention passes through the protrusion on the inner surface of the pipe. FIG. 11 is a schematic view showing a state in which the inspection cable according to the second embodiment of the present invention passes through the protrusion on the inner surface of the pipe.

  In general, the pipe P is obtained by connecting a plurality of pipes, and thus has a projection P1 such as a weld bead. In the case of the inspection cable guide 1 according to the first embodiment, as shown in FIG. 10A, the rotating body 21 contacts the protrusion P1. In order for the rotating body 21 to get over the protrusion P1, it is necessary to apply a thrust F1 that exceeds the height a1 of the protrusion P1, as shown in FIG. In particular, when the rotating shaft 21A of the rotating body 21 is an elastic shaft or the like, and the position of the rotating body 21 varies in the radial direction Dr in response to pressing from the radial direction Dr, a large thrust F1 is required. This is because, as the position of the rotating body 21 fluctuates, the thrust for getting over the protrusion P1 is converted into a pressing force that pushes the rotating body 21 in the radial direction Dr of the guide body 10.

  On the other hand, the inspection cable guide 5 according to the second embodiment has a step climbing guide portion 13. Therefore, as shown in FIG. 11 (a), the protrusion P1 and the step climbing guide portion 13 first come into contact with each other. Then, as shown in FIG. 11B, the step climbing guide portion 13 rides on the protrusion P1 by the height a2 by the thrust F2. Thereafter, by applying a thrust F2 ', the rotating body 21 rides on the protrusion P1 as shown in FIG. 11C, and gets over the protrusion P1 as shown in FIG. 11D. The height a3 that needs to be exceeded when the rotator 21 rides on the protrusion P1 is a height obtained by subtracting the height P2 that has risen on the protrusion P1 by the stepped overpass guide 13 from the height a1 of the protrusion P1. It is.

  Since the height a3 is lower than the height a1, the thrust F2 'required to get over the step of height a3 is smaller than the thrust F1 required to get over the step of height a1. Further, since the step crossing guide portion 13 does not rotate in the axial direction, the thrust F2 + F2 ′ necessary for the inspection cable guide 1 having the step crossing guide portion 13 to get over the protrusion P1 having the height a1 is also the step crossing guide portion 13. This is smaller than the thrust F1 required for the inspection cable guide 5 not having a height to get over the protrusion P1 having the height a1. That is, by providing the stepped over guide part 13, the step a1 of the projection P1 is larger than the rotating body, and even if it is difficult to get over the rotating body alone, it is easy to move the inspection cable guide back and forth. Become.

  In particular, when the position of the rotating body 21 fluctuates in the radial direction, the time for contacting the rotating body 21 and the protrusion P1 can be shortened by providing the step climbing guide portion 13, and the thrust for getting over the protrusion P1 is reduced. It can be avoided that the rotating body 21 is converted into a pressing force that pushes the rotating body 21 in the radial direction Dr of the guide body 10. Therefore, when the position of the rotating body 21 fluctuates in the radial direction, the effect of providing the step climbing guide portion 13 becomes more remarkable.

  In addition, there is a possibility that the step climbing guide portion 13 in the inspection cable guide 5 of the second embodiment may come into contact with the inner wall of the pipe P. Therefore, it is preferable to use the inspection cable guide 1 of the first embodiment and the inspection cable guide 5 of the second embodiment, depending on the state of the pipe to be inspected. For example, when inspecting a pipe with many bent parts, the inspection cable guide 1 of the first embodiment is used, and when inspecting a pipe with many protruding parts such as weld beads by joining a plurality of pipes, the second embodiment. The inspection cable guide 5 can be used properly.

“Third embodiment of inspection cable guide”
FIG. 12 is a schematic side view of the inspection cable guide according to the third embodiment of the present invention. FIG. 13 is a schematic cross-sectional view of the inspection cable guide according to the third embodiment of the present invention cut along the axis.

  As shown in FIGS. 12 and 13, in the inspection cable guide 6 according to the third embodiment, the rotation shaft 31 </ b> A of the rotating body 31 is inclined in one direction with respect to the orthogonal plane orthogonal to the axis Ar. And the fixing mode for fixing the guide body 10 to the cable 2 are different from the inspection cable guide 1 according to the first embodiment. In the following description, description of common parts is omitted. Moreover, in each drawing used for description, the same code | symbol shall be attached | subjected to the same component as FIGS.

  As shown in FIG. 12, in the inspection cable guide 6 according to the third embodiment, the plurality of rotating bodies 31 are provided on the outer peripheral surface of the guide body 10 at intervals in the circumferential direction and the axial direction. In FIG. 12, a plurality of rotating bodies 31 existing on the same virtual circle I ′ intersecting with the axis Ar at an interval in the circumferential direction Dc constitute one rotating body group 30. A plurality of rotating body groups 30 are formed in the axial direction Da.

  The virtual circle I ′ is inclined in one direction with respect to a plane orthogonal to the axis Ar. Therefore, the rotating shaft 31A of each rotating body 31 arranged along the virtual circle I 'is also inclined in one direction with respect to the plane orthogonal to the axis line Ar.

  As shown in FIG. 13, a bearing 40 is installed in the mounting hole 10 a of the guide body 10. The bearing 40 includes a fixing jig 41 that fixes the position of the guide body 10 in the axial direction Da. In the radial direction Dr of the guide main body 10, a gap 42 is provided between the fixing jig 41 and the guide main body 10, and the guide main body 10 is around the axis Ar around the fixing jig 41 provided along the axis Ar. Relative rotation is possible. In FIG. 13, a sleeve 43 is installed in the gap 42 between the fixing jig 41 and the guide body 10 in order to reduce the frictional force when the guide body 10 rotates relative to the axis.

  As shown in FIG. 14A, the fixing jig 41 includes an insertion member 44 and a fitting member 45. FIG. 14 is a schematic diagram for explaining the mounting of the bearing of the inspection cable guide in the third embodiment of the present invention.

  The insertion member 44 includes a base portion 44A, a support portion 44B protruding from the base portion 44A in the radial direction Dr, and an insertion portion 44C protruding from the base portion 44A in the axial direction Da. A male screw 44D is cut in the insertion portion 44C. A distal end portion 44E having an inclined surface 44Ea that widens from the distal end toward the base portion 44A is provided at the distal end of the insertion portion 44C.

  The fitting member 45 includes a base portion 45A, a support portion 45B protruding from the base portion 45A in the radial direction Dr, and a receiving portion 45C protruding from the base portion 45A in the axial direction Da. The receiving portion 45C has a gap in the radial direction Dr with the cable 2 to be inserted, and the gap forms a fitting portion 45E. A female screw 45D is cut on the inner surface of the receiving portion 45C. Further, the receiving portion 45C and the base portion 45A are continuous by an inclined surface 45Ea that widens from the tip of the receiving portion 45C toward the base portion 45A. The inclination angle of the inclined surface 45Ea in the fitting portion 45E with respect to the axial direction Da is larger than the inclination angle of the inclined surface 44Ea in the distal end portion 44E with respect to the axial direction Da.

  As shown in FIG. 14B, the fixing jig 41 is formed by inserting an insertion member 44 into a fitting member 45. The fitting member 45 and the insertion member 44 are fastened by twisting the male screw 44D of the insertion member 44 with respect to the female screw 45D of the fitting member 45.

  When the fitting member 45 and the insertion member 44 are fastened, as shown in FIG. 14C, the inclined surface 44Ea at the distal end portion 44E of the insertion member 44 and the inclination at the fitting portion 45E of the fitting member 45. The surface 45Ea comes into contact. Since the inclination angle of the inclined surface 45Ea in the fitting portion 45E with respect to the axial direction Da is larger than the inclination angle of the inclined surface 44Ea in the distal end portion 44E with respect to the axial direction Da, the distal end portion 44E is inclined inward in the radial direction Dr. Bit into cable 2. As a result, the fixing jig 41 is fixed to the cable 2.

  In FIG. 14, the guide main body 10 is not shown for the sake of simplicity, but in an actual usage mode, the insertion member 44 and the fitting member 45 are inserted into the mounting hole 10 a of the guide main body 10. As a result, the position of the guide body 10 in the axial direction Da is determined by the support portion 44B of the insertion member 44 and the support portion 45B of the fitting member 45 in the fixing jig 41 fixed to the cable.

  Next, the operation of the inspection cable guide 6 according to the third embodiment will be described. FIG. 15 is a schematic diagram illustrating a state where the inspection cable guide is inserted through the inside of the pipe according to the third embodiment of the present invention.

  When the inspection cable guide 6 is inserted into the pipe P, a thrust F is applied to one end of the inspection cable guide 6 to advance the pipe. As described above, the rotating body 31 is inclined in one direction with respect to a plane orthogonal to the axis Ar. Therefore, when the inspection cable guide 6 having the rotating body 31 advances in the axial direction Da, a force is applied to rotate the inspection cable guide 6 around the axis. The guide body 10 can be rotated relative to the axis Ar around the axis Ar. Therefore, the inspection cable guide 6 advances in the pipe P spirally while relatively rotating around the axis Ar. At this time, since the inspection cable guide 6 rotates independently of the cable 2, the cable 2 can be prevented from being twisted.

  When the inspection cable guide 6 advances in the pipe P while rotating spirally, the thrust required to get over the protrusion P1 of the pipe P can be reduced. The reason will be described below.

  FIG. 16 is a schematic diagram illustrating a state in which the rotating body of the inspection cable guide rides over the protrusion inside the pipe. FIG. 16A is a diagram illustrating a state in which the rotating body is obliquely incident on the projecting portion P1 extending in one direction. FIG. 16B is a diagram illustrating the projecting portion P1 extending in one direction. It is a figure which shows a mode that the rotary body injected with respect to parallel.

  When the protrusion P1 in the pipe P is a weld bead at the pipe joint, the protrusion P1 extends on the inner periphery of the pipe perpendicular to the extending direction of the pipe (axial direction Da). Therefore, the rotating body 31 in the inspection cable guide 6 according to the third embodiment is incident on the protrusion P1 as shown in FIG.

  On the other hand, in the case of the inspection cable guide 1 according to the first embodiment, the rotating body 21 extends along a plane orthogonal to the axis Ar. Therefore, as shown in FIG. 16B, the rotator 21 is incident on the protrusion P1.

  As shown in FIG. 16A, when the rotator 31 is incident on the protrusion P1 at an angle, the rotator 31 gradually climbs on the protrusion P1 from the tip end side in the axial direction Da of the rotator 31. That is, the rotating body 31 rides on the protrusion P1 at an angle θa. On the other hand, as shown in FIG. 16B, when the rotating body is incident on the protrusion P1 in parallel, the rotating body 21 rides on the protrusion P1 at an angle θb larger than θa. Therefore, when the rotating body 31 is incident on the protrusion P1 at an angle, the thrust f1 required to get over the protrusion P1 is the same as the protrusion P1 when the rotating body is incident on the protrusion P1 in parallel. It becomes smaller than the thrust f2 required for getting over.

  As described above, according to the inspection cable guide according to the present embodiment, the inspection cable guide can be moved forward and backward while rotating about the advancing / retreating direction of the inspection cable guide. Therefore, even when there is a protruding portion such as a weld bead inside the pipe, the rotating body can be moved obliquely with respect to the protruding portion, and the protruding portion can be easily climbed over.

  Further, the inspection cable guide according to the third embodiment is not limited to this configuration. Various modifications can be made without departing from the spirit of the present invention.

  FIG. 17 is a schematic side view of a modified example of the inspection cable guide according to the third embodiment of the present invention. The inspection cable guide 7 shown in FIG. 17 is such that the rotation shaft 51A of the rotating body 51 is inclined in one direction with respect to the orthogonal plane orthogonal to the axis Ar. The difference is that the extending direction of the rotating shaft 51A of the rotating body 51 and the extending direction of the virtual circle I constituting the rotating body group 50 do not match.

  In the inspection cable guide 7 according to the modification, the rotator 51 is present on the virtual circle I perpendicular to the axis Ar with a gap in the circumferential direction Dc. A plurality of rotating bodies 51 existing on the virtual circle I at intervals in the circumferential direction Dc constitute a rotating body group 50. A plurality of rotating body groups 50 are formed in the axial direction Da.

  The rotating shaft 51A of the rotating body 51 is inclined in one direction with respect to an orthogonal plane orthogonal to the axis line Ar. That is, the rotating body 51 is inclined in one direction with respect to the virtual circle I constituting the rotating body group 50.

  Further, the groove portion 12 disposed between the rotating body groups 50 adjacent to each other in the axial direction Da extends in the circumferential direction along each rotating body 51. Therefore, the groove portion 12 extends in a zigzag manner while having a bent portion in the circumferential direction.

  As described above, the rotating body 51 of the inspection cable guide 7 according to the modification shown in FIG. 17 is inclined in one direction with respect to the plane orthogonal to the axis Ar. Therefore, when the inspection cable guide 7 having the rotating body 51 advances in the axial direction Da, a force is applied to rotate the inspection cable guide 7 about the axis. Therefore, the inspection cable guide 7 advances in the pipe P in a spiral shape while relatively rotating around the axis Ar.

  That is, the inspection cable guide 7 according to the modified example can be moved forward and backward while rotating about the advancing / retreating direction of the inspection cable guide. Therefore, even when there is a protruding portion such as a weld bead inside the pipe, the rotating body can be moved obliquely with respect to the protruding portion, and the protruding portion can be easily climbed over.

"Fourth embodiment of inspection cable guide"
FIG. 18 is a schematic side view of the inspection cable guide according to the fourth embodiment of the present invention. In FIG. 18, the rotating body 61 present on the side surface of the inspection cable guide 8 on the opposite side of the drawing is illustrated by a one-dot chain line.

  As shown in FIG. 18, the inspection cable guide 8 according to the fourth embodiment is different from the first embodiment in that a plurality of rotating bodies 61 are spirally arranged along the outer peripheral surface about the axis Ar. Different from the inspection cable guide 1 according to the embodiment. In the following description, description of common parts is omitted. Moreover, in each drawing used for description, the same code | symbol shall be attached | subjected to the same component as FIGS.

  In the inspection cable guide 8 according to the fourth embodiment, a plurality of rotating bodies 61 are spirally arranged along the outer peripheral surface of the guide main body 10 around the axis Ar. That is, the plurality of rotating bodies 61 do not form a rotating body group.

  When the plurality of rotating bodies 61 are spirally arranged along the outer peripheral surface of the guide body 10 with the axis Ar as the center, the inspection cable guide 8 can be easily advanced and retracted even in a narrower pipe or a narrowed portion of the pipe. Can be moved.

  FIG. 19 is a schematic diagram illustrating a state in which the inspection cable guide according to the fourth embodiment of the present invention is inserted through the inside of the pipe. In general, the diameter of the inspection cable guide 8 inserted into the pipe P is smaller than the diameter of the pipe P so that the inspection cable guide itself is not clogged with the pipe. Therefore, one of the plurality of rotating bodies 61 existing along the outer peripheral surface of the inspection cable guide 8 inserted through the pipe P comes into contact with the inner surface of the pipe P. The rotating body 61 in contact with the pipe P generates a rotational force that relatively rotates the inspection cable guide 8 about the axis Ar.

  On the other hand, in the narrowed portion Pn, the inner diameter of the narrowed portion Pn and the outer diameter of the inspection cable guide 8 substantially coincide with each other, and all the rotating bodies 61 existing in the circumferential direction of the inspection cable guide 8 are connected to the inner surface of the pipe P. Contact may occur in the circumferential direction. In this case, it is necessary to make the direction of the rotational force that relatively rotates the inspection cable guide 8 about the axis Ar by each rotating body 61 coincide. If the direction of the generated rotational force is different, the inspection cable guide 8 cannot smoothly rotate about the axis Ar, which causes insertion resistance.

  In the inspection cable guide 8, a plurality of rotating bodies 61 are arranged in a spiral shape along the outer peripheral surface of the guide body 10 around the axis Ar. Therefore, the inspection cable guide 8 can be rotated in the same direction also in the narrowed portion Pn. That is, according to the inspection cable guide according to the present embodiment, the inspection cable guide 8 can be easily moved forward and backward even in a narrower pipe or a narrowed portion of the pipe.

DESCRIPTION OF SYMBOLS 100 ... Inspection sensor, 1,1 ', 5,6,7,8 ... Inspection cable guide, 2 ... Cable, 3 ... Inspection probe, 10, 10' ... Guide body, 10a ... Mounting hole, 10o, 10 'o ... outer peripheral surface, 12 ... groove part, 13 ... step overpass guide part, 20, 30, 50 ... rotating body group, 21, 21', 31, 51, 61 ... rotating body, 21A, 31A, 51A ... rotating shaft, 21B ... Rotating part, 40 ... Bearing, 41 ... Fixing jig, 42 ... Gap, 43 ... Sleeve, 44 ... Inserting member, 44A ... Base, 44B ... Supporting part, 44C ... Inserting part, 44D ... Male screw, 44E ... Tip Part, 44Ea ... inclined surface, 45 ... fitting member, 45A ... base part, 45B ... support part, 45C ... receiving part, 45D ... female screw, 45E ... fitting part, 45Ea ... inclined surface, I, I '... virtual circle , Da: axial direction, Dr: radial direction, Dc: circumferential direction , Ar ... axis, P ... piping, Pb ... bent portion, Pbi ... inner peripheral surface, Psi ... inner wall, P1 ... projections

Claims (10)

An inspection cable guide used for an inspection sensor for inspecting the inside of a pipe,
A guide body in which an outer peripheral surface has a spherical shape and a mounting hole portion through which a cable extending along an axis passes is formed;
A plurality of rotating bodies that are rotatable around a rotation axis that extends across the axis in the tangential direction of the outer peripheral surface of the guide body, and that are provided at intervals in the circumferential direction and the axial direction;
A test cable guide in which a groove portion recessed from the outer peripheral surface is formed between the rotating bodies adjacent in the axial direction among the plurality of rotating bodies. The plurality of rotating bodies constitutes a plurality of rotating body groups consisting of rotating bodies existing on the same virtual circle intersecting the axis,
A plurality of the rotating body groups are provided at intervals in the axial direction,
2. The inspection cable guide according to claim 1, wherein the groove portion is recessed from the outer peripheral surface and extends in the circumferential direction of the axis between the rotating body groups adjacent in the axial direction.   The inspection cable guide according to claim 1, wherein rotation axes of the plurality of rotating bodies are all inclined in one direction with respect to an orthogonal plane orthogonal to the axis.   2. The inspection cable guide according to claim 1, wherein the plurality of rotating bodies are spirally disposed along the outer peripheral surface about the axis. 3.   The inspection cable according to any one of claims 1 to 4, wherein the plurality of rotating bodies have a rotating shaft capable of changing a position of the rotating body in a radial direction in accordance with a pressure from the radial direction of the guide body. For guide. The groove is formed apart from the rotating body in the axial direction,
6. The inspection cable according to claim 1, further comprising a step crossing guide portion for assisting advancement and retraction of the guide body in the pipe between the rotating body and the groove portion adjacent in the axial direction. guide.   The inspection cable guide according to any one of claims 1 to 6, further comprising a bearing that is provided in an attachment hole portion of the guide main body and allows the guide main body to relatively rotate about the axis. The bearing has a fixing jig for fixing the position of the guide body in the axial direction,
In the radial direction of the guide body, a gap is provided between the fixing jig and the guide body,
The inspection cable guide according to claim 7, wherein the guide body is relatively rotatable around the axis around the fixing jig by the gap. The inspection cable guide according to any one of claims 1 to 8,
A cable attached to the inspection cable guide;
Inspection cable with. The inspection cable according to claim 9,
An inspection probe provided on any of the inspection cables;
Inspection sensor comprising:

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