JPH0134169Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a visual inspection device used for inspecting, for example, water turbines in hydroelectric power plants. A conventional example will be explained with reference to FIGS. 1 to 5. FIG. 1 is a sectional view showing a schematic configuration of a water turbine (shaft Francis turbine) of a hydroelectric power plant, and reference numeral 1 in the figure indicates a water turbine runner. This water wheel runner 1
is connected to a generator 3 via a main shaft 2. The water turbine runner 1 is hermetically sealed with an upper cover 4 and a lower cover 5, and is driven by driving water supplied through a casing 6 formed on the outer periphery. Further, from the viewpoint of structure and performance, the water turbine runner 1 has a primary back pressure chamber cover plate 7, a secondary back pressure chamber cover plate 8, and a lateral pressure chamber cover plate 9, as shown in FIG. In order to ensure the safety and maintain the performance of the water turbine runner 1, it is essential to maintain and inspect the primary back pressure chamber cover plate 7, secondary back pressure chamber cover plate 8, and lateral pressure chamber cover plate 9. Maintenance and inspection of the cover plate 9 is extremely important. The above-mentioned primary back pressure chamber cover plate 7, secondary back pressure chamber cover plate 8 and lateral pressure chamber cover plate 9
Maintenance and inspection of equipment is generally carried out in the following manner. That is, as shown in FIGS. 3 and 4, first, parts of the water turbine runner 1 and generator 3 are disassembled and jacked up to remove the primary back pressure chamber cover plate 7, the secondary back pressure chamber cover plate 8, and the side pressure chamber. The inspection surface of the cover plate 9 was exposed and inspected visually. The parts to be inspected at this time are the welded parts where each part is attached, as shown in Fig. 5 (the parts indicated by broken lines in the figure and all directions indicated by arrows are inspection parts). However, work such as disassembling and jacking up is not easy, and for example, it takes about three months to carry out an inspection once a year, which requires a huge amount of cost. This was not a good thing in terms of trying to improve. The present invention was developed based on the above points, and its purpose is to simplify inspection work, shorten the time required for inspection work, and reduce costs.
An object of the present invention is to provide a visual inspection device that can improve the operating rate. That is, the visual inspection device according to the present invention has an image guide and a light guide arranged adjacent to each other, the image guide and the light guide being sandwiched between a pair of flat guides, fixed with a connecting band, and a balancer weight attached to the tip. It is equipped with an inspection tool body and a processing mechanism that inputs and processes information on the surface to be inspected from the image guide, displays the image, and records it. The structure is such that it is inserted near the surface to be inspected. An embodiment of the present invention will be described below with reference to FIGS. 6 to 10. It should be noted that the same parts as in the prior art will be described with the same reference numerals. Figure 6 shows water wheel runner 1
2 is a diagram showing the relationship between the water turbine runner 1 and the lower cover 5, and a runner gap 10 is formed between the water turbine runner 1 and the lower cover 5. The lateral pressure chamber cover plate 9 described above is provided at the back of the runner gap 10. The present invention attempts to perform visual inspection using this runner gap 10. In addition, the reference numeral 11 in FIG. 6 is a primary balance tube.
Reference numeral 12 indicates a secondary balance tube. Next, the configuration of the visual inspection apparatus according to this embodiment will be explained with reference to FIGS. 7 and 8. 7th
Reference numeral 21 in the figure indicates an inspection tool body, and this inspection tool body 21 includes an image guide 22 that transmits an optical image, and a light guide 2 that transmits illumination light necessary for this image guide 22 to capture an optical image.
3. A pair of guides 24A, 2 located on both sides of the image guide 22 and light guide 23
The image guide 22, the light guide 23, and the guides 24A and 24B are the coupling band 2.
It is integrated by 5. The above guide 24A,
Reference numeral 24B is constituted by a highly rigid flat plate spring, and this is so that the pushing force is transmitted to the tip of the inspection tool body 21 when the inspection tool body 21 is inserted. And the above guide 24
The reason why A and 24B are made into a flat plate shape is to ensure parallelism with the surface to be inspected and to facilitate positioning of the inspection tool main body 21 . Furthermore, the reason why the image guide 22 and the light guide 23 are integrated is to match the illumination range and the inspection field of view. A groove 26 for the coupling band 25 is machined in the image guide 22 and the light guide 23, thereby limiting the increase in the size of the inspection tool and making it possible to accommodate narrow areas. Also, the coupling band 2 attached to the tip
5, image guide 22 and light guide 23
A key 27 is inserted between the two. That is, as shown in FIG. 7B, a key groove 28 is formed on the image guide 22 and light guide 23 sides, and the key 27 is engaged with this key groove 28 and coupled with a coupling band 25. i.e. key 2
By appropriately changing the shape of the image guide 7, the field illumination of the image guide 22 and the light guide 23 can be arbitrarily adjusted, and their fixation can be ensured. A balancer weight 29 is attached to the tips of the image guide 22 and the light guide 23 to balance the entire inspection tool body 21 , and operation wires 30A and 30B are connected to the guides 24A and 24B, respectively. The balancer weight 29 prevents the tip from warping or swinging, and the operating wire 30
The configuration is such that direction control is performed by A and 30B. The visual inspection device is comprised of the above-described inspection tool body 21 and a processing mechanism 31 that processes information on the inspection surface captured by the image guide 22 of the inspection tool body 21. This processing mechanism 31 includes an imaging color ITV camera 32 that inputs the information on the inspection surface from the image guide 22 and converts it photoelectrically, and a camera control unit 33 that converts the signal from the imaging color ITV camera 32 into an electrical signal. A monitor TV that inputs signals from this camera control unit 33 and displays the inspected surface in real time.
34, and a VTR 35 for recording signals from the camera control unit 33.
Note that 36 in the figure indicates a light source that supplies light to the light guide 23. According to the above configuration, the inspection tool main body 21 is first inserted through the runner gap 10 between the water turbine runner 1 and the lower cover 5 as shown in FIG.
The inspection is performed over the entire surface of the lateral pressure chamber cover plate 9 to be inspected. At this time, as shown in FIG. 9, the operating wires 30A and 30B prevent the inspection tool body 21 from bending to the left or right (indicated by broken lines in the figure). Information on the surface to be inspected is sent from the image guide 22 of the inspection tool main body 21 . and color for imaging
The image is displayed on a monitor TV 34 via an ITV camera 32 and a camera control unit 33, and is also recorded on a VTR 35. As described above, according to the visual inspection device according to the present embodiment, the inspection tool main body 21 is inserted through the runner gap 10 between the water turbine runner 1 and the lower cover 5, and the inspection tool body 21 is brought close to the lateral pressure chamber cover plate 9 as an inspection target. Since the chamber cover plate 9 can be visually inspected, there is no need to disassemble and jack up a part of the plant as in the past, making the inspection work easier and shortening the period required for inspection. It is possible to improve the operating rate and reduce costs. The inspection tool main body 21 according to this embodiment has an image guide 22 and a light guide 23 sandwiched between guides 24A and 24B from both sides, so that the inspection tool main body 21 can be attached to a desired surface to be inspected.
1 can be easily positioned, and since the guides 24A and 24B are made of highly rigid flat plate springs, the pushing force is transmitted to the tip of the inspection tool body 21 when inserting the inspection tool. It is also possible to easily ensure parallelism with the surface to be inspected. And image guide 22 and light guide 2
3 is fixed by the key 27 and the coupling band 25, so that the illumination range and the inspection field of view can always be matched, and stable information on the surface to be inspected can be obtained. In addition, since a balancer weight 29 is provided at the tip of the inspection tool body 21 , it is possible to prevent the tip from warping or swinging, thereby controlling the focal length of the image guide 22 over the entire inspection range, that is, the image guide 22 and the lateral pressure chamber. It becomes possible to maintain a constant distance from the cover plate 9, and a clear image can be obtained. Further, the guides 24A, 24B include operating wires 30A,
Since 30B is connected, the inspection tool body 2
When inserting 1, it is possible to perform isodirectional control to prevent bending to the left and right, thereby improving insertability and operability. As described in detail above, the visual inspection device according to the present invention has an image guide and a light guide arranged adjacent to each other, the image guide and the light guide being sandwiched between a pair of flat guides, fixed with a connecting band, and attached to the tip. It is equipped with an inspection tool body to which a balancer weight is attached, and a processing mechanism that inputs and processes the inspection surface information from the image guide, displays the image, and records it, and the inspection tool body is connected between the water turbine runner and the lower cover. The structure is such that it is inserted near the surface to be inspected through the runner gap. Therefore, unlike in the past, disassembling a part of the plant and then jacking it up makes it possible to perform inspections without having to carry out tedious operations, which simplifies inspection work and shortens the period required for inspections, thereby reducing costs. It is possible to reduce the amount of electricity and improve the operating rate.

[Brief explanation of the drawing]

Figures 1 to 5 are diagrams showing conventional examples.
The figure is a cross-sectional view of the water turbine, Figure 2 is a partially enlarged view of Figure 1, Figures 3 and 4 are diagrams for explaining the inspection method, Figure 5 is a diagram showing the inspection points, Figure 6 10 to 10 are diagrams showing an embodiment of the present invention, and FIG.
The figure is a sectional view showing the runner gap, FIG. 7A is a perspective view of the inspection tool body, FIG. 7B is a sectional view showing the key and keyway, FIG. 8 is a diagram showing the structure of the visual inspection device, and FIG. 9 10 is a diagram for explaining the function of the operating wire, and FIG. 10 is a diagram showing a state in which the inspection tool main body is inserted. 1... Water turbine runner, 5... Lower cover, 9... Lateral pressure chamber cover plate (surface to be inspected), 21 ... Inspection tool body, 22... Image guide, 23...
Light guide, 24A, 24B... Guide, 25
...Connection band, 29...Balancer weight,
31...Processing mechanism.

Claims (1)

[Scope of utility model registration request] An inspection tool body in which an image guide and a light guide are arranged adjacent to each other, these image guides and light guides are sandwiched between a pair of flat guides and fixed with a coupling band, and a balancer weight is attached to the tip; The inspection tool body is inserted into the vicinity of the surface to be inspected through a runner gap between the water turbine runner and the lower cover. A visual inspection device characterized by: