JP3089162B2 - 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, a pulley support means having a two-groove pulley at the tip and inserted into each of the inspection holes, and a pair of pulley support means facing each other. A two-wire winding / rewinding means arranged at each position, and electronic camera means having two wires connected to both ends via angle adjusting means, and two electronic wires at both ends of the electronic camera means. Wires are respectively connected to the two-wire winding / unwinding means via the two-groove type pulleys of the pulley support means.

[0008]

In the above means, when one of the two-wire winding and rewinding means performs a winding operation and the other two-wire winding and rewinding means performs a rewinding operation, the electronic camera is moved along with the two-wire together with the header. Moving. Then, the inner surface of the header in the direction along the wire and facing the camera is photographed in detail. When the above operation is performed after the camera is deflected by the angle adjusting means, the inside of the header inside the range different from the above is photographed in detail along the wire.

[0009] By repeating the above operation several times, the inner surface of the header is photographed in whole and in detail, and a detailed inspection of the narrow tube implantation hole and the like becomes possible.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, a vertical tubular inspection hole 3 is formed in the header 1 of the boiler on the left and right sides of the pipe 7 around the pipe 7.
There is.

The pulley support 20 has a cylindrical shape, and a two-groove pulley 22 is arranged at the tip of a cylinder 21, and a cap 10 with a hole in the center is connected to the base end of the cylinder 21.

The pulley support 20 is attached by inserting the cylinder 21 into the inspection hole 3 and then tightening the bolt 23 from the side of the cap 10.
And fix it to the cylinder of inspection hole 3.

An evaporator tube 24 and fins 11 are arranged in the header 1 to cover it. The two-wire winding and rewinding device 12 having the two-wire electric pulley 13 is disposed at a position outside the fins 11 (outside the furnace) and facing the pulley support 20.

As shown in FIGS. 2 to 5, the electronic camera device 4 is provided at the center of a cylindrical body 25 having both ends in a hemispherical shape.
A CCD camera 17 is arranged perpendicular to the axis. The lighting devices 16 are arranged on both sides thereof. As shown in FIGS. 4 and 5, a rod-shaped wire fixing bracket 19 having a base b at the both ends of the body 25 is inserted coaxially from the inside and penetrated from the inside, and the tip protrudes. The ends of the two wires 6 are fixed to the tips. The rod-shaped portion of the wire fixing bracket 19 has a ring-shaped groove c. A set screw 26 is screwed into this groove c radially from the outside of the body 25 and fixed. Radial angle-adjustment markings a are provided at both ends of the body 25 near the wire fixing brackets 19 at equal intervals.

The wire fixing bracket 19 and the set screw 26 are angle adjusting means. The cord 9 for the CCD camera 17 and the lighting device 16 is pulled out from one end of the body 25.

The electronic camera device 4 includes a CC in the header 1.
The D camera 17 is arranged so as to face the ligament 2 direction.
The wires 6 on both sides are respectively connected to the electric pulley 13 of the two-wire winding / rewinding device 12 via the two groove pulleys 22 of the pulley support 20 and are wound in a tension state. Code 9
Is connected to an external video deck 18 via one inspection port 3.

In the above, observation of two parts of the ligament is as follows.
When the video deck 18 is operated in the state of FIG.
The CD camera 17 and the lighting device 16 operate. Then, when the left two-wire take-up / rewind device 12 performs a take-up operation and the right-side take-up / rewind device 12 performs a rewind operation, the camera device 4 moves from left to right. Then, the CCD camera 17 captures an image of the ligament 2 in detail and sends a signal to the video deck 18 to form an image.
When the left and right two-wire take-up / rewind devices 12 operate in the opposite direction, the camera device 4 takes a picture while moving in the opposite direction.

The direction of the CCD camera 17 with respect to the plane including the two wires 6 is adjusted by loosening the set screw 20, turning the body 25 around the wire fixing bracket 19 by a predetermined angle, and then fixing. Adjusting angle is marking a
And the mark of the wire fixing bracket.

In this way, the inner surface of the header 1, especially the ligament 2, can be observed in whole and in detail. Therefore, the reliability of the inspection is greatly improved.

[0021]

As described above, according to the present invention, the camera can be moved along the inner surface of the header through two wires. Further, since the direction of the camera can be adjusted by the angle adjusting means, 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.

FIG. 2 is a front view of the camera device of the embodiment.

FIG. 3 is a partial cross-sectional side view of the camera device of the embodiment.

FIG. 4 is a sectional view of a body end portion of the embodiment.

FIG. 5 is an AA view of FIG. 4 of the embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 boiler header 2 ligament 3 inspection hole 4 electronic camera device 6 2 wires 9 cord 10 cap 12 2 wire winding and rewinding device 13 electric pulley stand 16 lighting device 17 CCD micro camera 18 video deck 19 wire fixing bracket 20 pulley Support stand 21 cylinder 22 2 groove pulley 23 bolt 25 body 26 set screw

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F22B 37/02 G01N 21/954

Claims (1)

(57) [Claims] 1. A pipe having a pair of inspection holes, a pulley supporting means having a two-groove pulley at a tip and inserted into each of the inspection holes, and two pulleys arranged at positions opposed to the respective pulley supporting means. Wire winding and rewinding means, and electronic camera means having two wires connected to both ends via angle adjusting means, wherein the two wires at both ends of the electronic camera means are respectively supported by the pulley support. A header inner surface inspection apparatus, which is connected to the two-wire winding / rewinding means via a two-groove type pulley.