JP2002023066A - Tube group inspecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tube inspecting device capable of photographing the inserting direction surface and the surface opposite to the inserting direction of a tube by inserting an arm from one direction. SOLUTION: A supporter 13 is attached to a strut 12 inserted to a leg part 11 so as to move vertically, and an arm 14 is moved horizontally inside the supporter. The rear end of a sub-arm 15 is attached to the tip of the arm so as to jump up, and a planar mirror 16 is attached to the tip of the sub-arm so as to be rotated around a vertical axis. Further, a television camera 17 having a field of view in the front and an illumination instrument 18 are installed on the tip of the arm. By inserting the arm between tubes and spring up the sub-arm, the arm inserting direction surface of the tube can be photographed by the television camera. By further inserting the arm, moving the sub-arm downward and controlling the angle of the planar mirror, the surface opposite to the arm inserting direction can be photographed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pipe inspection apparatus,
In particular, the present invention relates to a tube inspection device for inspecting a tube surface of a tube heat exchanger.

[0002]

2. Description of the Related Art In a thermal power plant (a thermal power plant and a nuclear power plant), a large number of tubular heat exchangers such as a feed water heater and a condenser are used. In a tubular heat exchanger, when a hole is drilled in the tube due to stress corrosion and unstable flow, and the fluid in the tube leaks to the outside, not only does the performance of the heat exchanger deteriorate, but also The mixing of the internal and external fluids can lead to unexpected situations.

[0003] Therefore, when leakage of the fluid in the pipe is detected, it is necessary to visually inspect the pipe surface to specify the leak location. For the above visual inspection, conventionally using an inspection device having an arm equipped with a television camera at the tip, inserting the arm into the gap between the tubes and photographing the tube surface,
It was common to specify the location of the leak using an image displayed on a monitor.

[0004] In the above inspection apparatus, the photographable tube surface is limited to the arm insertion side. Therefore, in order to photograph the tube surface on the opposite side, it is necessary to insert the arm from the opposite side.

[0005]

However, performing the inspection in two parts not only increases the number of inspection steps, but also inspects the opposite surface when the arm cannot be inserted from the opposite side due to the structure. There was a problem that it was not possible. The present invention has been made in view of the above problems, and has as its object to provide a tube inspection apparatus capable of photographing an insertion direction surface and a counter insertion direction surface of a tube by inserting an arm from one direction.

[0006]

According to a first aspect of the present invention, there is provided a tube inspection apparatus comprising: an arm horizontally supported by a column, which can be inserted between pipes; Sub-arm connected, sub-arm transition means installed at the rear end of the arm to transition the sub-arm between the flip-up position and the horizontal position, and installed at the front end of the sub-arm so as to be rotatable in a horizontal plane via a vertical rotation axis. A flat mirror, a plane mirror rotating means installed at the rear end of the arm to rotate the plane mirror in a horizontal plane, an irradiation means installed at the tip of the arm to irradiate the front of the arm, and a Photographing means having a photographing field of view in the front.

According to the present invention, the surface of the tube in the arm insertion direction is photographed and inspected with the sub-arm raised, and the surface of the tube opposite to the arm insertion direction is set with the sub-arm horizontal and the plane mirror set at an appropriate rotation angle. Photographed and inspected. The tube inspection apparatus according to the second invention further includes a microphone installed at the tip of the arm.

In the present invention, sound leaking from the tube is detected by the microphone.

[0009]

1 and 2 are a plan view and a side view of a pipe inspection apparatus according to a first embodiment of the present invention. 13 are attached. An arm 14 is inserted into the guide 13 so as to be displaceable back and forth. A rack gear 141 is attached to a side surface of the arm 14, and is engaged with a pinion gear (not shown) driven by an arm moving handle 131 provided on the guide 13 to operate the arm moving handle 131. This allows the arm 14 to move back and forth.

A rear end of a sub arm 15 is connected to a horizontal axis at a front end of the arm 14, so that the sub arm 15 can be flipped upward. Further, a flat mirror 16 is attached to the tip of the sub arm 15 so as to be rotatable about a vertical axis. At the rear end of the arm 14, a handle 142 for lifting the sub-arm and a handle 143 for rotating the plane mirror are provided.

The sub-arm 14 and the sub-arm lifting handle 142 are connected by a sub-arm lifting wire 144. By operating the sub-arm lifting handle 142, the sub-arm 14 can be set to the flip-up position or the normal photographing position. The plane mirror 16 and the plane mirror rotation handle 143 are connected by a plane mirror rotation wire 145 via an appropriate pulley, and the plane mirror 1 is operated by operating the plane mirror rotation handle 143.
6 can be rotated.

At the tip of the arm 14, a CCD camera 17 and a lighting device 18 such as a halogen lamp are embedded. Note that the field of view of the CCD camera 17 and the irradiation direction of the lighting fixture 18 are in the forward direction of the arm 14. Leg 1
1 is installed in the vicinity of the tubular heat exchanger to be inspected, and the arm moving handle 131 is operated to connect the arm 14 to the tube 2.
1 and 22 and tubes 23 and 24.

FIG. 3 and FIG. 4 are a top view and a side view at the time of photographing the plane in the insertion direction.
By operating the sub-arm 15 by operating 42,
The plane mirror 16 is connected to the field of view of the CCD camera 17 and the lighting fixture 18.
Out of the irradiation range. That is, the luminaire 18 illuminates the area indicated by the mark x in FIG. 3 (that is, the plane in the arm insertion direction of the tubes 22 and 24), and the CCD camera 17 photographs the surface in this area.

FIG. 5 and FIG. 6 are top views (part 1) and (part 2) at the time of photographing the plane in the anti-insertion direction. The sub-arm raising handle 142 is operated to move the sub-arm 15 to the normal photographing position (that is, a plane mirror). 16 is returned to the field of view of the CCD camera 17 and the irradiation position of the lighting device 18). That is, the plane mirror 16 is set to the position shown in FIG. 5 by manipulating the plane mirror rotation handle 143, and the range indicated by the cross mark in FIG. 5 (the back surface of the tube 21) is photographed.

Further, the plane mirror 16 is rotated by 90 ° by operating the plane mirror rotation handle 143 to set it at the position shown in FIG. 6, and the range indicated by the mark x in FIG. 6 (the back of the tube 23) is photographed. FIG. 7 is a top view and a side view of the pipe inspection apparatus according to the second invention, and FIG. 8 is an enlarged view of its arm. The same elements as those of the pipe inspection apparatus according to the first invention have the same reference numerals. Use

That is, in the tube inspection apparatus according to the second invention, the microphone 70 is attached to the tip of the arm 14. That is, even when it is difficult to find the leaked portion of the fluid by visual inspection of the tube surface, such as when the fluid is leaking from the pinholes of the tubes 21 to 24, the leak sound is detected by the microphone 70 by detecting the leak sound. It is possible to determine the presence or absence.

When a leak sound is detected by the microphone 70, it is easy to find a leak point by carefully visually inspecting the surrounding pipe surface.

[0018]

According to the pipe inspection apparatus according to the first invention,
Even if the arm can only be inserted from one side of the heat exchanger, it is possible to inspect the front and back of the tube. According to the pipe inspection device according to the second invention, it is possible to detect the leaked sound by the microphone.

[Brief description of the drawings]

FIG. 1 is a plan view of a pipe inspection apparatus according to a first invention.

FIG. 2 is a side view of the pipe inspection apparatus according to the first invention.

FIG. 3 is a top view at the time of shooting in the insertion direction.

FIG. 4 is a side view at the time of shooting in the insertion direction.

FIG. 5 is a top view (No. 1) at the time of imaging in the anti-insertion direction plane.

FIG. 6 is a top view (part 2) at the time of imaging in the anti-insertion direction.

FIG. 7 is a plan view and a side view of a pipe inspection apparatus according to a second invention.

FIG. 8 is an enlarged view of an arm of the pipe inspection apparatus according to the second invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Leg part 12 ... Post 13 ... Support 14 ... Arm 141 ... Rack gear 142 ... Sub-arm flip-up handle 143 ... Plane mirror rotation handle 144 ... Sub-arm flip-up wire 145 ... Plane mirror rotation wire 15 ... Sub-arm 16 ... Plane mirror 17 ... TV Camera 18 Lighting equipment 70 Microphone

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kao Hagiwara 1-1-1 Wadazakicho, Hyogo-ku, Hyogo-ku, Kobe-shi, Hyogo Mitsubishi Heavy Industries, Ltd.Kobe Shipyard (72) Inventor Koji Nakata Hyogo-ku, Kobe-shi, Hyogo 1-1-1 Wadazakicho Inside the Kobe Shipyard of Mitsubishi Heavy Industries, Ltd. (72) Inventor Hiromasa Kamei 2-19-19, Shinhama, Araimachi, Takasago-shi, Hyogo F-term (reference) 2F065 AA49 AA60 BB08 BB11 CC00 FF04 GG02 JJ03 JJ26 LL13 LL62 MM16 PP02 PP05 PP26 2H040 AA03 CA12 CA25 GA02 GA11

Claims (2)

[Claims] An arm that is horizontally supported by a support and can be inserted between pipes; a sub-arm having a rear end connected to a front end of the arm via a horizontal rotation shaft; and a rear end of the arm. A sub-arm transition means for transitioning the sub-arm between a flipped-up position and a horizontal position, a flat mirror rotatably mounted in a horizontal plane via a vertical rotation axis at a tip of the sub-arm, A flat mirror rotating means installed at a rear end and rotating the flat mirror in a horizontal plane; an irradiating means installed at a tip of the arm and illuminating the front of the arm; A tube bank inspection apparatus, comprising: a photographing unit having a photographing visual field in front of the arm. 2. The tube bank inspection apparatus according to claim 1, further comprising a microphone installed at a tip of the arm.