JP2019066516A - Interior surface inspection device - Google Patents

Abstract

To provide an interior surface inspection device that inspects a state of an interior surface of an inspected object.SOLUTION: An interior surface inspection device comprises: a camera 2 that has a cylindric housing 21 extending from a base end to a tip end in an axial direction, and an image pick-up element 22; a casing 4 that is cylindric, extending in the axial direction, surrounds the housing of the camera in a circumferential direction with a gap, and is inserted into a hole owned by an inspected object together with the camera; a first air passage 61 that is provided along the axial direction between an outer peripheral surface of the housing in the camera and an inner peripheral surface of the casing therein, and has a tip end side in the axial direction encapsulated; a second air passage 62 that is provided at a tip end part in the axial direction of the casing, and communicates with the first air passage and an outside of the casing and extends in a radial direction; an air introduction part 63 that introduces gas from a base end side in the axial direction to the first air passage; and a measurement unit that measures a flow rate or pressure of the gas to be introduced from the air introduction part to the first air passage. The image pick-up element is arranged on a tip end side in the axial direction of the housing.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an inner surface inspection apparatus for inspecting the state of the inner surface of an object to be inspected.

  Various devices such as electric devices and automobiles include those having a tubular member and a member having a tubular hole. A member of such a shape is a portion through which a fluid flows inside, and a portion that fits with another member. For this reason, it is required that the cylindrical inner surface does not have a defect such as a crack or a bubble, or that the error of the molding dimension is small. For example, in a cylinder used for an automobile engine, it is necessary for the cylindrical inner surface dimension to be finished with high accuracy.

Therefore, in order to inspect the presence or absence of the defect of the inner surface of a hole about a cylindrical member or a member conventionally, the inner surface inspection device was used. About the conventional inner surface inspection apparatus, it describes in Unexamined-Japanese-Patent No. 2015-224877, for example.
JP, 2015-224877, A

  In the conventional inner surface inspection device described in JP-A-2015-224877, a reflecting portion is provided on the tip end side in the axial direction, and the reflecting portion reflects light incident from the outside in the radial direction to the base end side. The reflector protrudes axially from the casing. For this reason, in order to be exposed without covering with a casing, a reflective part needs to be protected from the outside. However, if the reflective portion is protected, light can not be incident, the inner surface inspection can not be performed, or the inspection accuracy may be degraded.

  An object of the present invention is to provide an inner surface inspection apparatus capable of performing an accurate inspection while protecting the apparatus.

  The present invention is an inner surface inspection apparatus for inspecting the state of an inner surface of an object to be inspected, the camera having a cylindrical casing axially extending from the proximal end to the distal end, an imaging device, and extending in the axial direction The casing has a cylindrical shape and encloses the casing of the camera in the circumferential direction with a gap, and a casing inserted with the camera into the hole of the inspection object, the outer peripheral surface of the casing in the camera, and the casing A first air passage provided along the axial direction between the inner circumferential surface of the casing and the axial direction tip end side is sealed, provided at an axial direction tip portion of the casing, the first air passage, A radially extending second air passage communicating with the outside of the casing, an air introducing portion for introducing a gas into the first air passage from an axial proximal end side, and the first air from the air introducing portion Measure the flow rate or pressure of the gas introduced into the passage Comprising a measuring unit, wherein the imaging elements are arranged in the axial direction distal end side of the housing.

  According to the present invention, the camera can be inserted directly into the object to be inspected. For this reason, compared with the inspection method using light reflection etc., it can inspect more accurately. Moreover, in order to insert the camera provided with the image pickup element directly into the object to be inspected, the operator can hold the hand to perform the inspection. Furthermore, since the camera is protected by the housing, even if the camera is exposed from the casing, the possibility that inspection can not be performed due to breakage or the like can be avoided.

FIG. 1 is a view showing the configuration of an inner surface inspection apparatus according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of an insertion device provided in the inner surface inspection device. FIG. 3 is a flow chart showing work steps in the inner surface inspection apparatus. FIG. 4 is a cross-sectional view of an insertion device according to a modification. FIG. 5 is a cross-sectional view of an insertion device according to a modification. FIG. 6 is a cross-sectional view of the insertion device without the camera cover.

  Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In the present application, a direction parallel to the central axis of the casing of the insertion device provided in the inner surface inspection apparatus is “axial direction”, a direction orthogonal to the central axis is “radial direction”, and a direction along an arc centered on the central axis It is referred to as "circumferential direction".

  Further, the insertion tool is a tool which is held by the operator and inserted into the hole of the object to be inspected. In the following, the end of the insertion tool which is gripped by the operator in the axial direction is referred to as "proximal". In addition, the end of the insertion device on the side to be inserted into the hole of the test object in the axial direction is referred to as the “tip”.

<1.1. Configuration of inner surface inspection device>
FIG. 1 is a view showing the configuration of an inner surface inspection apparatus 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the insertion device 10 provided in the inner surface inspection device 1.

  The inner surface inspection apparatus 1 includes an insertion device 10, a control unit 11, an air supply unit 12, and a monitor 13.

  The insertion device 10 is a device inserted into the hole 81 of the test object 8. The insertion device 10 has a camera 2. The insertion device 10 images the state of the inner surface of the hole 81 by the camera 2. The to-be-tested object 8 is a cylindrical member which comprises various apparatuses, such as an electric equipment or a motor vehicle. The inspection object 8 is, for example, a cylinder used for an automobile engine.

  The insertion device 10 has a camera 2, a camera cover 3, a casing 4, and a grip 5.

  The camera 2 has a housing 21, an imaging element 22, a lens 23, and an illumination 24. The housing 21 is a cylindrical member extending in the axial direction along the central axis 9. The imaging element 22 is provided on the tip end side in the axial direction in the housing 21. The lens 23 is provided at the axial direction end of the housing 21. The illumination 24 is disposed radially outward of the lens 23 at an axial tip end of the housing 21. Only one illumination 24 may be disposed at the axial tip of the housing 21, or a plurality of illuminations 24 may be disposed around the central axis 9 and surrounding the lens 23. In FIGS. 1 and 2, in the radial direction, two illuminations 24 are disposed in opposite directions with respect to the lens 23. By arranging the illumination 24 at the end in the axial direction of the housing 21, the inner surface of the hole 81 of the inspection object 8 can be brightened, and an accurate imaging result can be obtained.

  The camera cover 3 is a protection member which is mounted on the camera 2 and protects the camera 2. The camera cover 3 is formed of, for example, metal. The camera cover 3 has a small diameter cylindrical portion 31, a medium diameter cylindrical portion 32, and a large diameter cylindrical portion 33 which are disposed in order from the front end side in the axial direction. The small diameter cylindrical portion 31, the medium diameter cylindrical portion 32, and the large diameter cylindrical portion 33 are cylindrical members that surround the central axis 9 and extend along the axial direction. The small diameter cylindrical portion 31, the medium diameter cylindrical portion 32, and the large diameter cylindrical portion 33 have a continuous through hole extending along the axial direction. The camera 2 is inserted into the through hole. The camera 2 and the camera cover 3 are fixed, for example, by an adhesive.

  The small diameter cylindrical portion 31 is a cylindrical member which is longer in the axial direction than the medium diameter cylindrical portion 32 and the large diameter cylindrical portion 33. The small diameter cylindrical portion 31 has its axial end aligned with the axial end of the housing 21 of the camera 2 and extends from the axial end toward the proximal end.

  The medium diameter cylindrical portion 32 and the large diameter cylindrical portion 33 are sealing portions which seal the axial direction proximal end side of the first air passage 61 described later. The medium diameter cylindrical portion 32 is provided on the axial direction base end side of the small diameter cylindrical portion 31. The outer diameter of the medium diameter cylindrical portion 32 is larger than the outer diameter of the small diameter cylindrical portion 31. The medium diameter cylindrical portion 32 is an example of the “base” in the present application.

  The large diameter cylindrical portion 33 is provided on the axially proximal end side of the middle diameter cylindrical portion 32. The large diameter cylindrical portion 33 is an annular portion that spreads radially outward beyond the medium diameter cylindrical portion 32 and is in contact with a surface on the axial direction proximal end side of the casing 4 described later. The outer diameter of the large diameter cylindrical portion 33 is larger than the outer diameter of the middle diameter cylindrical portion 32. At the boundary between the large diameter cylindrical portion 33 and the medium diameter cylindrical portion 32, an annular annular groove 313 surrounding the central axis 9 and recessed toward the base end side in the axial direction is provided. The annular groove 313 is an annular shape along the circumferential direction that extends radially outward to a position where the annular groove 313 axially overlaps with a casing 4 described later. Further, the annular groove 313 is provided in the large diameter cylindrical portion 33 at a position facing the axial direction proximal end side of the casing 4. An O-ring 314 is fitted in the annular groove 313. The O-ring 314 is an example of the “first elastic member” in the present application.

  The casing 4 has a tubular shape extending in the axial direction from the distal end side to the proximal end side around the camera cover 3. The casing 4 circumferentially surrounds the housing 21 of the camera 2 with a gap, and is inserted into the hole 81 of the inspection object 8 together with the camera 2. The casing 4 is formed of, for example, a material such as a metal or an alloy.

  The casing 4 has a proximal end 41 and a cylindrical portion 42. The proximal end 41 is disposed on the axial proximal side. The cylindrical portion 42 extends along the central axis 9 from the proximal end portion 41 toward the axial distal end side.

  The base end portion 41 has a thin portion 411 and a thick portion 412.

  The thin portion 411 is disposed on the axial proximal side. The thin portion 411 has a through hole surrounding the central axis 9, and the middle diameter cylindrical portion 32 of the camera cover 3 is inserted into the through hole. The inner circumferential surface of the thin portion 411 and the outer circumferential surface of the middle diameter cylindrical portion 32 are in close contact with each other. Further, the axial direction base end of the thin portion 411 closely contacts the large diameter cylindrical portion 33 of the camera cover 3.

  The thick portion 412 is disposed on the tip end side in the axial direction of the thin portion 411. The thick portion 412 has a through hole surrounding the central axis 9. The opening diameter of the through hole of the thick portion 412 is smaller than the opening diameter of the through hole of the thin portion 411 and larger than the outer diameter of the small diameter cylindrical portion 31 of the camera cover 3. The small diameter cylindrical portion 31 of the camera cover 3 is inserted into the through hole of the thick portion 412. A gap is provided between the inner circumferential surface of the thick portion 412 and the outer circumferential surface of the small diameter cylindrical portion 31. The gap is a part of a first air passage 61 described later.

  The cylindrical portion 42 extends from the thick portion 412 in the axial direction toward the distal end side. The outer diameter of the cylindrical portion 42 is smaller than the outer diameter of the proximal end portion 41. The cylindrical portion 42 also has a through hole surrounding the central axis 9. The opening diameter of the through hole of the cylindrical portion 42 is the same as the opening diameter of the through hole of the thick portion 412. However, the opening diameter of the through holes is not completely the same by providing an air introducing portion 63 described later. The small diameter cylindrical portion 31 of the camera cover 3 is inserted into the through hole of the cylindrical portion 42. A gap is provided between the inner circumferential surface of the cylindrical portion 42 and the outer circumferential surface of the small diameter cylindrical portion 31. A gap between the cylindrical portion 42 and the small diameter cylindrical portion 31 and a gap between the thick portion 412 and the small diameter cylindrical portion 31 constitute a first air passage 61 described later.

  The axial front end of the camera cover 3 inserted into the casing 4 protrudes from the cylindrical portion 42 of the casing 4 to the axial front end side. The cylindrical portion 42 extends radially inward from an axial tip end of the inner peripheral surface thereof, and holds the outer peripheral surface of the cylindrical portion 42. That is, the axial direction tip end of the cylindrical portion 42 is a holding portion that holds the camera 2. And the axial direction front-end | tip part of the cylindrical part 42 seals the axial direction front-end | tip part of the below-mentioned 1st air passage 61. As shown in FIG.

  The grip 5 is provided radially outside the proximal end 41 of the casing 4. The operator holds the grip 5 and inserts the insertion tool 10 into the hole 81 of the object 8 to be inspected.

  The insertion device 10 configured as described above has a first air passage 61, a second air passage 62, and an air introduction portion 63.

  The first air passage 61 is provided along the axial direction between the outer peripheral surface of the housing 21 of the camera 2 and the inner peripheral surface of the casing 4. More specifically, the first air passage 61 is formed of a gap between the cylindrical portion 42 and the small diameter cylindrical portion 31 and a gap between the thick portion 412 and the small diameter cylindrical portion 31. The axial front end side of the first air passage 61 is sealed by the axial front end of the cylindrical portion 42 in the casing 4 holding the camera 2. Further, the proximal end side in the axial direction of the first air passage 61 is sealed by the medium diameter cylindrical portion 32 and the large diameter cylindrical portion 33 of the casing 4.

  As described above, the large diameter cylindrical portion 33 of the camera cover 3 has an annular annular groove 313 surrounding the central axis 9 on the contact surface with the thin portion 411 of the casing 4. The annular groove 313 is provided with an O-ring 314. With this configuration, even if a gap is generated between the medium-diameter cylindrical portion 32 of the camera cover 3 and the thin-walled portion 411 of the casing 4, the axially proximal end of the first air passage 61 can be sealed by the O ring 314. .

  The second air passage 62 is a radially extending through hole provided at an axial tip end of the casing 4. The second air passage 62 communicates the first air passage 61 with the outside of the casing 4 at the axial direction tip end of the first air passage 61. The insertion device 10 has two second air passages 62. The two second air passages 62 are located on opposite sides of the camera 2. That is, the cylindrical portion 42 is provided with through holes serving as the second air passage 62 at symmetrical positions with respect to the central axis 9.

  The air introducing portion 63 introduces a gas into the first air passage 61 from the axial direction proximal end side. The air introducing portion 63 is provided at the proximal end portion 41 of the casing 4. An air supply unit 12 is connected to the air introduction unit 63. Thus, the gas is introduced from the air supply unit 12 into the inside of the first air passage 61 via the air introduction unit 63. The gas introduced from the air introducing unit 63 is supplied to the first air passage 61. Then, the gas travels in the first air passage 61 in the axial direction from the base end side to the tip end side, and is discharged to the outside of the casing 4 via the two second air passages 62.

  The control unit 11 is electrically connected to the camera 2, the air supply unit 12, and the monitor 13. The control unit 11 may be a microcomputer provided in the insertion device 10, or may be a device provided separately from the insertion device 10, for example, a general-purpose personal computer.

  The control unit 11 controls the drive of the camera 2 and the air supply unit 12. The control unit 11 also receives an image S4 output from the camera 2 and air pressure information S122 output from the pressure / voltage conversion unit 122 of the air supply unit 12. The control unit 11 calculates the inner diameter S111 of the hole 81 based on the air pressure information S122. Then, the control unit 11 outputs the video S4 input from the camera 2 and the inner diameter S111 to the monitor 13.

  The air supply unit 12 includes an air supply source 121 and a pressure / voltage conversion unit 122. The air supply source 121 introduces the air, which has been adjusted to a constant pressure by a pressure adjusting means such as a regulator, via the pressure / voltage conversion unit 122, based on the inner diameter measurement command signal S113 output from the control unit 11. The air is supplied from the portion 63 into the first air passage 61. As a result, the gas is discharged radially outward of the casing 4 through the first air passage 61 and the second air passage 62. For the gas supplied from the air supply source 121, for example, air is used.

  At this time, the pressure of the gas in the pressure / voltage converter 122 changes in accordance with the inner diameter of the hole 81 near the second air passage 62. The pressure / voltage conversion unit 122 converts the pressure of the gas passing through the pressure / voltage conversion unit 122 into air pressure information S122, which is a voltage signal, and outputs the air pressure information S122 to the control unit 11. Thus, the pressure / voltage conversion unit 122 measures the pressure of the gas in the air introduction unit 63. That is, the power / pressure conversion unit 132 is a measurement unit that measures the pressure of the gas introduced into the first air passage 61.

  Note that, instead of the pressure / voltage conversion unit 122, a measurement unit that measures the flow rate of gas in the air introduction unit 63 or the first air passage 61 may be used. In that case, the control unit 11 calculates the inner diameter S111 of the hole 81 based on the flow rate of the gas in the air introduction unit 63.

  The monitor 13 is a display that displays the image S4 and the inner diameter S111 output from the control unit 11. In the present embodiment, since the video S4 and the inner diameter S111 are simultaneously displayed on the monitor 13, the video S4 and the inner diameter S111 can be correlated and inspected. In the present embodiment, the inner surface inspection apparatus 1 is configured to include the control unit 11 and the monitor 13 described below, but the control unit 11 and the monitor 13 described later are separate apparatuses from the inner surface inspection apparatus 1 It is also good.

  In the present embodiment, the insertion device 10 has two second air passages 62. The two second air passages 62 discharge gas in opposite directions with respect to the central axis 9. That is, the two second air passages 62 are arranged at positions on the outer circumferential surface of the casing 4 that are farthest from each other in the circumferential direction. Thus, the inner diameter of the hole 81 can be measured more accurately.

<1.2. About work process>
Subsequently, with reference to FIG. 3, working steps of inner surface inspection and inner diameter measurement using the inner surface inspection device 1 will be described. FIG. 3 is a flow chart showing the work process in the inner surface inspection apparatus 1.

  First, the insertion tool 10 is inserted into the hole 81 of the inspection object 8 (step ST101). Next, the operator finely adjusts the position of the insertion device 10, and aligns the insertion device 10 with the hole 81 of the inspection object 8 (step ST102). At this time, the tip of the insertion device 10 is disposed near the entrance of the hole 81.

  Next, the control unit 11 performs an inner surface inspection process while moving the insertion device 10 to the axial direction distal end side (step ST103). That is, the inner surface of the hole 81 is imaged by the imaging element 22 of the camera 2 while moving the tip of the inner surface inspection apparatus 1 from the entrance of the hole 81 to the back. The video data is stored in the control unit 11.

  Subsequently, the control unit 11 performs an inner diameter measuring process while moving the insertion device 10 to the axial direction proximal end side (step ST104). That is, the inner diameter measuring step is performed while moving the tip of the inner surface inspection apparatus 1 from the back of the hole 81 toward the entrance. Specifically, a gas is introduced from the air supply source 121 to the air introduction unit 63 via the pressure / voltage conversion unit 122, and the control unit 11 calculates the pressure based on the pressure of the gas measured by the pressure / voltage conversion unit 122. The inner diameter S111 of the hole 81 is calculated. The calculated inner diameter data of the hole 81 is stored in the control unit 11.

  Then, after the inner surface inspection step and the inner diameter measurement step are completed, the insertion tool 10 is removed from the inspection object 8 (step ST105).

  The inner surface inspection step and the inner diameter measurement step may be performed simultaneously.

  Thus, by using the inner surface inspection device 1, the inner surface inspection and the inner diameter measurement can be performed by a single device without using separate devices. Therefore, since the setting process to the apparatus of the to-be-tested object 8 corresponded to step ST101 and step ST102 and the removal process of the to-be-tested object 8 of step ST105 can be performed only once, working efficiency improves.

  Further, in the present embodiment, the camera 2 can be directly inserted into the inspection object 8. For this reason, compared with the inspection method using light reflection etc., it can inspect more accurately. Further, unlike in the case of inspection using reflection of light, a light source for light irradiation to be reflected by the inner surface of the inspection object 8 is not required, and the miniaturization of the inner surface inspection apparatus 1 can be realized. Further, in order to directly insert the camera 2 provided with the imaging element 22 into the inspection object 8, the operator can hold the insertion tool 10 in his hand to perform inspection. Furthermore, since the camera 2 has the housing 21 and is protected by the camera cover 3, even if the camera 2 is exposed from the casing 4, the possibility that inspection can not be performed due to breakage or the like can be avoided.

  Furthermore, the first air passage 61 is provided between the camera cover 3 and the casing 4. For this reason, the diameter of the first air passage 61 can be adjusted by adjusting the outer diameter of the camera cover 3 without changing the type of the camera 2.

<2. Modified example>
Although the exemplary embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments.

  4 and 5 are cross-sectional views of an insertion device 10 according to a modification. In the example of FIG. 4, the axial position of the axial tip of the camera 2 and the camera cover 3 and the axial position of the axial tip of the casing 4 are the same. In this case, axial tips of the camera 2 and the camera cover 3 can be protected. However, "the same" here also includes substantially the same.

  Further, an O-ring 7 may be interposed between the casing 21 of the camera 2 and the casing 4 to seal the tip end side of the first air passage 61 in the axial direction. The O-ring 7 is an example of the “second elastic member” in the present application.

  Moreover, the fixing method of the camera 2 and the camera cover 3 is not limited to adhesion. In the example of FIG. 4, the camera 2 and the camera cover 3 are fixed (chuck fixed) by inserting the camera 2 into the camera cover 3 while rotating the camera cover 3 around the central axis 9. It is also good. Further, as shown in FIG. 5, the camera cover 3 may be crimped and fixed to the camera 2 in the crimped portion 35 on the axial direction distal end side.

  Furthermore, the inner surface inspection apparatus 1 may not have the camera cover 3. FIG. 6 is a cross-sectional view of the insertion device 10 without the camera cover. In this example, the first air passage 61 is provided between the casing 21 of the camera 2 and the casing 4. In this case, the number of parts can be reduced and the cost can be reduced.

  Further, the size, shape, and the like of each member are not limited to the contents of the above-described embodiment, and can be appropriately changed according to the shape, the diameter, and the like of the hole 81 of the inspection object 8. For example, although the outer diameter of the cylindrical portion 42 is smaller than the outer diameter of the base end portion 41, the magnitude relationship may be reversed. Further, although the number of second air passages 62 is two, it may be one or three or more. When a plurality of second air passages 62 are provided, they may be arranged at equal intervals in the circumferential direction around the central axis 9 or may be arranged unevenly.

  In addition, the shape of the detail of the inner surface inspection apparatus may be different from each drawing of the present application. Further, each element appearing in the above embodiment or modification may be combined appropriately as long as no contradiction occurs.

  The present invention is applicable to an inner surface inspection device.

1: inner surface inspection device 2: camera 3: camera cover 4: casing 5: grip 7: O ring 8: inspection object 9: central axis 10: insertion tool 11: control unit 12: air supply unit 13: monitor 21: Housing 22: imaging device 23: lens 24: illumination 31: small diameter cylindrical portion 32: medium diameter cylindrical portion 33: large diameter cylindrical portion 35: crimped portion 41: base end portion 42: cylindrical portion 61: first air passage 62 A: second air passage 63: air introducing portion 81: hole 121: air supply source 122: voltage converting portion 132: pressure converting portion 313: annular groove 314: O-ring 411: thin portion 412: thick portion S111: inner diameter S113: Inner diameter measurement command signal S122: Air pressure information S4: Image

Claims (12)

An inner surface inspection apparatus for inspecting the state of the inner surface of an inspection object, wherein
A camera having a cylindrical casing axially extending from the proximal end to the distal end, and an imaging device;
An axially extending cylindrical shape, which has a gap and circumferentially surrounds a casing of the camera and is inserted into a hole of an object to be inspected together with the camera;
A first air passage provided along an axial direction between an outer peripheral surface of the casing in the camera and an inner peripheral surface of the casing, and having a tip end side sealed in the axial direction;
A radially extending second air passage provided at an axial tip end of the casing and communicating the first air passage with the outside of the casing;
An air introducing portion for introducing a gas into the first air passage from an axial proximal end side;
A measurement unit configured to measure the flow rate or pressure of the gas introduced from the air introduction unit into the first air passage;
Equipped with
The inner surface inspection device, wherein the imaging element is disposed on an axial tip end side of the housing. The inner surface inspection apparatus according to claim 1, wherein
A camera cover that extends axially and is mounted to the housing of the camera;
Equipped with
The first air passage is
Provided between an outer peripheral surface of the camera cover and an inner peripheral surface of the casing,
Internal inspection device. The inner surface inspection apparatus according to claim 2, wherein
The camera cover is
An axial proximal end, a sealing portion sealing the axial proximal end of the first air passage,
Have
Internal inspection device. The inner surface inspection apparatus according to claim 3, wherein
The sealing portion is
The base,
An annular portion extending radially outward from the base portion, the annular portion being in contact with the axial proximal end side of the casing;
The annular portion is provided at a position facing the axial proximal end side of the casing, and has an annular annular groove recessed toward the axial proximal end side,
The inner surface inspection device, further comprising: an annular first elastic member fitted in the annular groove. The inner surface inspection apparatus according to any one of claims 1 to 4, wherein
An axial tip end of the camera protrudes axially beyond the casing.
Internal inspection device. The inner surface inspection apparatus according to any one of claims 1 to 4, wherein
The axial position of the axial tip of the camera and the axial position of the axial tip of the casing are identical.
Internal inspection device. An inner surface inspection apparatus according to any one of claims 1 to 6, wherein
The casing is
A holding portion that extends radially inward from an axial tip end side of the inner circumferential surface and holds the camera,
Have
An axial tip end of the first air passage is sealed by the holding portion.
Internal inspection device. The inner surface inspection apparatus according to any one of claims 1 to 7, wherein
A second elastic member provided between the camera and the casing and sealing an axial tip end side of the first air passage;
, An inner surface inspection device. The inner surface inspection apparatus according to any one of claims 1 to 8, wherein
The casing of the camera and the casing are cylindrical,
Internal inspection device. The inner surface inspection apparatus according to any one of claims 1 to 9, wherein
A gripping portion gripped by a worker, provided on the axial proximal end side of the casing,
, An inner surface inspection device. An inner surface inspection apparatus according to any one of claims 1 to 10, wherein
Having two said second air passages,
The two second air passages are located on opposite sides of the camera,
Internal inspection device. The inner surface inspection apparatus according to any one of claims 1 to 11, wherein
The camera is
A lens provided at an axial end of the housing;
Illumination disposed at a radial outer side of the lens at an axial tip end of the housing;
Have
Internal inspection device.

Images