JP2000056062A - Piping inner face inspecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately specify the direction of an inspection position in remotely inspecting a piping inner face. SOLUTION: This piping inner face inspecting device is provided with a longitudinally movable wire 29 extended in the longitudinal direction in a piping 1 and removably suspended and a remote control type moving camera device 30 fixed to the wire 29. The moving camera device 30 is provided with a stationary section having a rotary mechanism and a small camera and a rotary head section having an inclined mirror facing the small camera and the cover glass of an outer periphery section corresponding to it. The small camera and the rotary head section are synchronously rotated around the center axis by the rotary mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for remotely inspecting the inside of piping of various plants and the like.

[0002]

2. Description of the Related Art As pipes used in various plants continue to be used, internal damage is caused and performance is deteriorated. Therefore, the inside of the pipe is inspected periodically or as needed, and necessary measures are taken depending on the result. This will be outlined with respect to an example of inspection of the piping of the nuclear facility shown in FIG. In the figure, piping 1
Is provided with a flow nozzle 3 and the adhesion of iron oxide to the flow nozzle 3 affects its characteristics. Therefore, the inside of the pipe is inspected mainly for the purpose of inspecting the adhesion state. In this case, since the pipes 1 are provided with the nozzles 5 and 7 with the flow nozzle 3 interposed therebetween, the guide wires 11 are stretched as shown in the drawing using the nozzles 5 and 7. The rotating mirror 13 is attached to the guide wire 11, and the guide wire 11 is wound by the wire winding drum 15 to move the rotating mirror 13 in the axial direction. The rotating mirror 13
By rotating the mirror rotation knob 19 of the flexible shaft 17 connected thereto, it is rotated around the axis, and the entire inner peripheral surface of the flow nozzle 3 is projected. This rotating mirror 1
The image of No. 3 was displayed on the guide mirror 18, and the inside of the pipe, especially the inner surface of the flow nozzle 3 was inspected by observing the image.

[0003]

The piping internal inspection device having the above configuration has the following problems. That is, the position of the image to be observed depends on the position and orientation of the rotating mirror 13 in the longitudinal direction. However, since the rotating mirror 13 is rotated by the flexible shaft 17, the actual orientation, that is, the inspection orientation, can be accurately grasped. It was difficult. Similarly, the rotating mirror 13 is connected to the wire winding drum 1.
Because of the movement in the longitudinal direction by 5, it was difficult to accurately grasp the position in the longitudinal direction. In short, although the inner surface of the pipe 1 including the flow nozzle 3 can be inspected, it is difficult to accurately grasp the position to be inspected, which may hinder the implementation of subsequent measures. Therefore, an object of the present invention is to provide a pipe inner surface inspection device capable of accurately grasping a position to be inspected.

[0004]

According to the present invention, in order to achieve the above object, an apparatus for inspecting the inner surface of a pipe is provided so as to extend in the pipe in the longitudinal direction and to be detachably mounted, and to be movable in the longitudinal direction. The camera comprises a wire, a remotely operated mobile camera device fixed to the wire, the mobile camera device includes a stationary unit having a rotating mechanism and a small camera, a tilt mirror and an outer peripheral cover facing the small camera. It has a rotating head section provided with glass, and the small camera and the rotating head section are configured to rotate around a central axis in synchronization with a rotating mechanism. A power cable, a cooling air supply hose, and the like for remotely operating the mobile camera device extend from the stationary portion and communicate with a control rack outside the piping, and preferably a built-in focus motor for a small camera.

[0005]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In addition, the same parts are denoted by the same reference numerals, including the drawings related to the prior art.
First, referring to FIG. 1, a pipe 1 having a flow nozzle 3 therein is provided with nozzles 25 and 27 suitable for inserting a mobile camera device described later. A wire support guide 23 having a guide pulley 21 at the tip is attached to the nozzles 25 and 27 at the time of inspection. A wire 29 stretched between the pair of guide pulleys 21 is connected to one of the wire support guides 23.
The tension is applied by the winding drum 28 provided at the, and the winding is performed. A mobile camera device 30, whose detailed structure will be described later, is attached to the wire 29.

Next, the structure of the mobile camera device 30 will be described with reference to FIGS. 2, 3 and 4. In the figure, a mobile camera device 30 includes a stationary portion 31 and a rotating head portion 33, and a wire hook 35 is provided outside a casing of the stationary portion 31.
Are projected and fixed to the wire 29 described above. Head motor 3 provided inside casing
7 is a camera casing 4 supported via a bearing 39
1 through gears 43 and 45 so as to be able to transmit power. A small camera 47 is provided at the center of the camera casing 41.
Is provided. Therefore, when the head motor 37 is operated, the camera casing 41, that is, the small camera 47 rotates around the axis.

A reflection mirror 51 is provided in the casing of the rotary head section 33 coaxially with the stationary section 31 so as to face the lens of the small camera 33. Reflection mirror 5
1 is inclined as shown in the figure, and a viewing window, that is, a cover glass 53 is provided on the outer peripheral portion corresponding to the inclination. The cover glass 53 is made of a polycarbonate resin plate, but other materials may be used. And the tilt mirror 5
On the back side of 1, lighting fixtures or lamps 55 are provided facing the cover glass 53, and the arrangement relationship is particularly clearly shown in FIG. 3. A focus motor 59 is provided on a support 57 that supports the tilt mirror 51, and its output shaft is connected to a focus ring 65 of the small camera 47 via gears 61 and 63 so as to be capable of transmitting power. Then, the small camera 4
When adjusting the focus of 7, the focus motor 59 rotates the focus ring 65 to adjust the aperture.

The support 57 for supporting the reflection mirror 51, the lamp 55, the focus motor 59 and the like can be rotated together with the small camera 47, and the direction confirmation marking 67 is provided inside the cover glass 53. Is provided. Therefore, the direction of the inspection site can be easily confirmed from the image of the small camera 47. Further, a power supply cable for supplying electric power to the focus motor 59, the head motor 37, the lamp 55, and the like, a control cable for controlling these, a signal line for transmitting an image of the small camera 47, and a hose for transmitting cooling air are shown. Although not shown, it extends through the cable inlet 69 on the rear surface of the stationary portion 31 and extends to a control rack (not shown) usually provided close to the outside of the pipe 1, and communicates with a monitor or a control panel. are doing. Accordingly, the image projected by the small camera 47 is remotely observed while confirming the azimuth, and the mobile camera device 30 is controlled.

[0009]

As described above, according to the present invention,
Since the small camera provided in the stationary part and the reflecting mirror in the rotary head part are rotated integrally and the rotation direction is directly confirmed by marking, a clear image of the inspection part can be obtained and the direction or position can be obtained. It can be specified accurately. In addition, a clear image can be obtained by supplying cooling air to prevent clouding of a cover glass or an illumination lamp.

[Brief description of the drawings]

FIG. 1 is an overall layout view showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a main part of the embodiment.

FIG. 3 is a transverse sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a transverse sectional view taken along the line IV-IV in FIG. 2;

FIG. 5 is an overall conceptual diagram showing a use state of a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 piping 3 flow nozzle 21 guide pulley 23 wire support guide 25, 27 nozzle 28 winding drum 29 wire 30 moving camera device 31 stationary part 33 rotating head part 35 wire hook 37 head motor 39 bearing 41 camera casing 43, 45 gear 47 Compact camera 51 Reflective mirror 53 Cover glass 55 Lamp 57 Support 59 Focus motor 61, 63 Gear 65 Focus ring 67 Marking 69 Cable inlet

Claims (1)

[Claims] 1. A mobile camera device having a wire extending in a longitudinal direction and being detachably mounted in a pipe and movable in the longitudinal direction, and a remotely operated mobile camera device fixed to the wire. Has a stationary part provided with a rotating mechanism and a small camera, and a rotating head part provided with an inclined mirror directed to the small camera and a cover glass on the outer periphery corresponding to the inclined mirror, and the small camera and the rotating head The pipe inner surface inspection device, wherein the portion is configured to rotate around a central axis in synchronization with the rotation mechanism.