JP2961054B2 - Header inside inspection equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a header inner surface inspection apparatus for inspecting the inner surface of a header having inspection holes such as a boiler.

[0002]

2. Description of the Related Art Conventionally, inspection of the inner surface of a header of a boiler having an inspection hole is performed by inserting a fiberscope into the header through an inspection hole and locally observing the fiberscope from the tip thereof.

[0003]

When a boiler having an inspection hole is used repeatedly for a long time in association with the start and stop of the boiler, a thermal fatigue crack (referred to as a ligament crack) occurs in an inner ligament (a thin tube implantation hole). Occurs.

However, the method of observing with a fiberscope as in the above-mentioned prior art is a local inspection, and there is a risk that a ligament crack may be lost. Missing ligament cracks develop excessively, causing steam leakage and the like, and eventually stop functioning as a boiler.

In order to prevent such a serious accident, a technique for inspecting the inner surface of the header as a whole and in detail has not been established.

[0006]

The present invention employs the following means to solve the above-mentioned problems.

That is, as a header inner surface inspection device, a tube holder having a pair of inspection holes, first sprocket support means having a sprocket at the tip and inserted into each of the inspection holes, and each first sprocket. A second sprocket supporting means disposed at a position opposite to the supporting means, an electronic camera having a chain connected to both ends, and a tensioning means for the chain, wherein the chain is tensioned via the tensioning means for the chain. The electronic camera is arranged on the sprockets of the first and second sprocket support means in a loop and the electronic camera is located between the respective first sprocket support means.

[0008]

In the above means, when the chain moves, the electronic camera moves along the inner side of the header. Then, the entire inner surface of the header is photographed in detail and in detail, and a detailed inspection of the narrow tube implantation hole and the like can be performed.

[0009]

One embodiment of the present invention will be described with reference to FIG.

The boiler header 2 has a vertical cylindrical inspection hole 1 on the face of the header 2 on the left and right with respect to the pipe 13.

The first sprocket support 6 has a cylindrical shape, and a sprocket is disposed at the tip of a cylinder 20, and a cap 21 having a hole at the center is connected to the proximal end of the cylinder 20.

To mount the support 6, the cylinder 20 is inserted into the inspection hole 1 and then fixed to the cylinder of the inspection hole 1 with bolts 22 from the side of the cap 21.

An evaporating tube 7 and fins 8 are arranged in the header 2 so as to cover it. Second sprocket support 1 with handle 18 driven sprocket 9
Numeral 0 is disposed outside the fin 8 (outside the furnace) at a position facing the first sprocket support 1.

A chain 3 is connected to both ends of a CCD micro camera inner surface observation device (electronic camera) 4.
On one side, along the chain 3, a camera remote 15
And a code 16 of a monitor 17 are arranged.

The wire and chain fixing rods 12 and 12b are longer than the outer diameter of the pipe 13, and a fixed sprocket 11 is mounted at the center. One end of a wire 14 is fixed to both ends of the wire chain fixing rod 12. A wire 14 is attached to both ends of the wire / chain fixing rod 12a.
, And a fitting 23 that is tensed is attached.

The wire / chain fixing rods 12, 12a, the fixed sprocket 11, the wire 14, and the metal fitting 23 are tensioning means.

The chain 3 of the CCD micro camera 4 is arranged in a loop on each of the sprockets 5 and 9 such that the CCD micro camera 4 is located between the sprockets 5 inside the header 2. Then, both ends of the chain 5 are hung and fixed on the fixed sprocket 11 of the wire / chain fixing rods 12 and 12a. The two wires 14 are arranged with the pipe 13 interposed therebetween, and the metal fittings 23 of the wire chain fixing rod 12a are provided.
And she is nervous. In the figure, b is a cutout hole of the fin 8 for passing the chain 3.

In the above, observation is performed by first raising the micro camera incorporated in the CCD micro camera inner surface observation device 4 with the camera remote device 15 and turning on the monitor 17 so that the signal received by the micro camera is displayed on the monitor 17. Observable.

To move the camera, turning the handle 18 with the monitor 17 turned on causes the camera 4 to move along the inner surface of the header 2 via the chain 3. Then, the inner surface of the header 2, in particular, 19 parts of the ligament can be observed and inspected in whole and in detail.

In this way, the inner surface of the header, particularly all the ligaments 19 can be observed and inspected in detail, so that the reliability of the inspection is greatly improved.

[0021]

As described above, according to the present invention, the camera connected to the chain can move along the inner surface of the header through the chain, so that the entire inner surface can be observed and inspected in detail.

Therefore, the reliability of the inspection is greatly improved, and a great effect can be expected for the safe and stable operation of the whole plant.

[Brief description of the drawings]

FIG. 1 is a partial sectional configuration diagram of an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 inspection hole 2 header 3 chain 4 CCD micro camera inner surface observing device 5 inner surface guiding sprocket 6 sprocket support 7 evaporating tube 8 fin 9 outer surface guiding sprocket 10 sprocket support 11 fixed sprocket 12 wire / chain support rod 13 piping 14 wire 15 Camera remote 16 code 17 monitor 18 handle 19 ligament

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Kei Shibashi 5-717-1, Fukahori-cho, Nagasaki-shi Mitsubishi Heavy Industries, Ltd. Nagasaki Research Laboratory (72) Inventor: Masahiro Kobayashi 5-717-1, Fukahori-cho, Nagasaki-shi Mitsubishi (56) References JP-A-4-22847 (JP, A) JP-A-60-50673 (JP, A) JP-A-3-296648 (JP, A) JP-A-60-1985 57815 (JP, A) JP-A 6-47852 (JP, U) JP-A 3-76155 (JP, U) (58) Fields studied (Int. Cl. ⁶ , DB name) G01N 21/84 G01N 21 / 88

Claims (1)

(57) [Claims] A first pipe having a pair of inspection holes and a first sprocket having a sprocket at a tip inserted into each of the inspection holes.
A sprocket supporting means, a second sprocket supporting means disposed at a position facing each of the first sprocket supporting means, an electronic camera having a chain connected to both ends, and a tensioning means for the chain. The chain is tensioned by the first and second chains via the chain tensioning means.
An apparatus for inspecting an inner surface of a header, wherein the electronic camera is arranged in a loop on the sprocket of the sprocket supporting means and the electronic camera is located between the first sprocket supporting means.