JP4455273B2 - Narrow pipe outer surface visual inspection device - Google Patents

Description

  The present invention is a narrow pipe external surface visual inspection for remotely performing a visual inspection of the pipe outer surface in a narrow part where a large number of pipes such as boiler heat transfer tubes are densely arranged and difficult for an inspector to enter. It relates to the device.

  In general, in the case of a boiler such as a pressurized fluidized bed combustor (PFBC) installed in a thermal power plant, a large number of heat transfer tubes are arranged inside the boiler. Although the surface needs to be visually inspected, the minimum gap between them is about 10 [mm], making it difficult for the inspector to enter.

  Conventionally, as shown in FIG. 5, a glass fiber 3 is extended from a light source device 2 to which a monitor 1 is connected, and a fiberscope 4 is attached to the tip of the glass fiber 3. The fiberscope 4 attached to the distal end is inserted so as to drop between the pipes 5 and the image of the outer surface of the pipe 5 displayed on the monitor 1 is checked.

For example, Patent Document 1 shows a technique related to the inspection apparatus as described above.
Japanese Patent Laid-Open No. 11-83747

  However, as described above, when the fiberscope 4 attached to the tip of the glass fiber 3 is inserted so as to be dropped between the pipes 5, the fiberscope 4 is shaken when the position of the pipe 5 to be inspected is deep. Thus, it is difficult to identify and capture the inspection position. On the other hand, the fiberscope 4 has a drawback that the captured image range is narrow and the image is unclear, and the inspection takes a long time.

  In view of such circumstances, the present invention provides a narrow pipe outer surface visual inspection apparatus that can capture a wide range of clear images in a narrow part where the pipes are dense and can improve inspection efficiency by visual inspection of the pipe outer surface. It is something to be offered.

The present invention is a narrow pipe outer surface visual inspection device for performing a visual inspection of the pipe outer surface by remote control from a narrow part where a large number of pipes are densely arranged,
A rod made of a tubular member insertable between pipes and adjustable in length;
A camera holding means provided with a camera that is attached to the tip of the rod so as to swing freely and illuminates the outer surface of the pipe, and a camera that photographs the outer surface of the pipe;
Angle adjusting means for adjusting the swing angle of the camera holding means;
Display means for displaying an image taken by the camera ,
The camera holding means includes a holder frame having a U-shaped cross section and fixed to the tip of the rod, and a camera head mounted in the holder frame so as to be swingable around a pin and provided with an illumination and a camera. Configure
A first wire having one end connected to the distal end of the camera head and the other end penetrating a rod made of a holder frame and a tubular member, and being drawn from the proximal end of the rod; and the camera head of the first wire A second wire having one end connected to the base end of the camera head that is symmetrical with respect to the connection to the connection portion and the other end passing through a rod made of a holder frame and a tubular member and drawn from the base end of the rod in which according to the narrowed part pipe outer surface inspection apparatus characterized by being configured from.

  According to the above means, the following operation can be obtained.

  Insert the rod with the camera holding means attached to the tip so that it drops between the pipes, pass it through the narrow part that becomes the smallest gap, and then place the rod at the position where there is some space. After rotating 90 degrees as the center and adjusting the direction of the camera holding means, operating the angle adjusting means, the swing angle of the camera holding means is adjusted, and the outer surface of the pipe illuminated by the illumination is captured by the camera. The image is displayed on the display means, and when the inspector visually checks the image, the ash adhesion state, the presence or absence of cracks, and the like are inspected.

  As a result, unlike the conventional case where the fiberscope attached to the tip of the glass fiber is inserted so as to be dropped between the pipes, the camera can be operated even when the position of the pipe to be inspected is deep. While it is easy to identify and capture the inspection position without shaking, the image range captured by the camera is wide and the image becomes clear, and the time required for inspection can be shortened.

Further, in the narrow pipe external surface visual inspection device, the holder frame is fixed to the rod tip so that a portion extending in a U-shaped section of the holder frame extends in parallel with the axis of the rod, or the rod The holder frame may be fixed to the tip so that a bifurcated portion of the holder frame having a U-shaped cross section extends at right angles to the axis of the rod.

According to the narrow pipe outer surface visual inspection device according to claims 1 to 3 of the present invention, a wide range of clear images can be captured in a narrow pipe where the pipes are densely packed, and the inspection efficiency of the pipe outer surface is visually improved. An excellent effect can be achieved.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 3 show an example of an embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 5 denote the same parts, which can be inserted between the pipes 5 and have a length. Camera holding means 9 provided with an adjustable rod 6, an illumination 7 that is swingably attached to the tip of the rod 6 and illuminates the outer surface of the pipe 5, and a camera 8 such as a CCD camera that photographs the outer surface of the pipe 5. And an angle adjusting means 10 for adjusting the swing angle of the camera holding means 9 and a display means 11 such as a monitor for projecting an image taken by the camera 8.

  The rod 6 can be adjusted in its overall length by adding a tubular member 6a having a required length.

  On the other hand, as shown in FIG. 3, the camera holding means 9 has a U-shaped cross section and is fixed to the tip of the rod 6 so as to be swingable around the pin 9b in the holder frame 9a. The camera head 9c is provided with the illumination 7 and the camera 8.

  Further, as shown in FIG. 3, the holder frame 9a is fixed to the tip of the rod 6 so that a bifurcated portion having a U-shaped section in the holder frame 9a extends substantially parallel to the axis of the rod 6. The thickness t of the holder frame 9 a is the same as the outer diameter φd of the rod 6 so that the holder frame 9 a can pass through the portion of the minimum gap between the pipes 5 together with the rod 6.

  Further, the angle adjusting means 10 includes a first wire 10a having one end connected to the distal end portion of the camera head 9c and the other end penetrating the holder frame 9a and the rod 6 and drawn from the base end of the rod 6; One end is connected to the base end of the camera head 9c that is substantially symmetric with respect to the connection portion of the wire 10a to the camera head 9c with respect to the pin 9b, and the other end passes through the holder frame 9a and the rod 6 and the base end of the rod 6 And a second wire 10b drawn from the wire.

  As shown in FIG. 2, the first wire 10a whose one end is connected to the distal end of the camera head 9c is hooked on the first capstan roller 12 disposed inside the proximal end of the holder frame 9a and then the rod. 6, the second wire 10b, one end of which is connected to the base end of the camera head 9c, has two second capstan rollers 13 disposed inside the base end of the holder frame 9a. , 14 and then retracted into the rod 6.

  A cable 8a connected to the camera 8 and a cable 7a connected to the illumination 7 extend along the outer side of the rod 6 to the proximal end side of the rod 6 and are connected to a display unit 11 such as a monitor 15 ( (See FIG. 1).

  Next, the operation of the illustrated example will be described.

  The rod 6 with the camera holding means 9 attached to the tip is inserted so as to be dropped between the pipes 5 while adding the tubular member 6a, and after passing through the narrow portion that becomes the minimum gap, there is some space in the space. 3, after the rod 6 is rotated approximately 90 ° about its axis from the state shown in FIG. 3 and the orientation of the holder frame 9 a is adjusted to the state shown in FIG. 1 and FIG. When the first wire 10a is pulled out, the second wire 10b is sent out, or on the contrary, when the second wire 10b is pulled out, the first wire 10a is sent out, and the swing angle of the camera head 9c is adjusted. The outer surface of the pipe 5 illuminated by the illumination 7 is captured by a camera 8 such as a CCD camera, and the image is displayed on a display means 11 such as a monitor via a controller 15. It is out, by the inspector to visually it, so that the inspection of the presence or absence of adhesion state and cracks ash is performed.

  As a result, unlike the conventional case where the fiberscope 4 attached to the tip of the glass fiber 3 is inserted so as to be dropped between the pipes 5, the position of the pipe 5 to be inspected is deep. However, while the camera head 9c does not shake and it is easy to identify and capture the inspection position, the image range captured by the camera 8 is wide and the image becomes clear, and the time required for inspection can be shortened.

  In this way, a clear image can be captured in a wide range in a narrow part where the pipes 5 are dense, and the inspection efficiency by visual inspection of the outer surface of the pipes 5 can be improved.

  FIG. 4 shows another example of the embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 1 to 3 denote the same components, and the basic configuration is shown in FIGS. 3 is the same as that shown in FIG. 3, but the feature of this example is that, as shown in FIG. 4, a holder frame 9a is provided at the tip of the rod 6 and a portion extending in a bifurcated portion having a U-shaped cross section in the holder frame 9a. It is at a point fixed so as to extend substantially perpendicular to the axis of the rod 6.

  In the example shown in FIG. 4, since it becomes possible to take a long distance from the axial center of the rod 6 to the camera 8, depending on the arrangement state of the pipe 5, it can be used separately from the example shown in FIGS. By using together, the inspection efficiency by visual inspection of the outer surface of the pipe 5 can be further improved.

  Note that the narrow pipe external surface visual inspection apparatus of the present invention is not limited to the illustrated example described above, and it is needless to say that various modifications can be made without departing from the scope of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole schematic block diagram which shows an example of the form which implements this invention. It is the II section expanded sectional view of FIG. It is the III-III arrow line view of FIG. It is an expanded sectional view which shows the other example of the form which implements this invention. It is a whole schematic block diagram which shows a prior art example.

Explanation of symbols

5 Piping 6 Rod 7 Illumination 8 Camera 9 Camera holding means 9a Holder frame 9b Pin 9c Camera head 10 Angle adjusting means 10a First wire 10b Second wire 11 Display means

Claims (3)

A narrow pipe external surface visual inspection device for remotely performing a visual inspection of the pipe outer surface from a narrow part where a large number of pipes are densely arranged,
A rod made of a tubular member insertable between pipes and adjustable in length;
A camera holding means provided with a camera that is attached to the tip of the rod so as to swing freely and illuminates the outer surface of the pipe, and a camera that photographs the outer surface of the pipe;
Angle adjusting means for adjusting the swing angle of the camera holding means;
Display means for displaying an image taken by the camera ,
The camera holding means includes a holder frame having a U-shaped cross section and fixed to the tip of the rod, and a camera head mounted in the holder frame so as to be swingable around a pin and provided with an illumination and a camera. Configure
A first wire having one end connected to the distal end of the camera head and the other end penetrating a rod made of a holder frame and a tubular member, and being drawn from the proximal end of the rod; and the camera head of the first wire A second wire having one end connected to the base end of the camera head that is symmetrical with respect to the connection to the connection portion and the other end passing through a rod made of a holder frame and a tubular member and drawn from the base end of the rod constriction pipe outer surface inspection apparatus characterized by being configured from. The holder frame to the rod end, constriction pipe outer surface inspection apparatus according to claim 1, wherein the portion extending bifurcated U-shaped cross-section is fixed so as to extend parallel to the axis of the rod in the holder frame. The holder frame to the rod end, constriction pipe outer surface inspection apparatus according to claim 1, wherein the portion extending bifurcated U-shaped cross-section is fixed so as to extend at right angles to the axis of the rod in the holder frame.

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