JPS5893968A - Method of inspection equipment in pumping-up power plant and apparatus thereof - Google Patents

Abstract

PURPOSE:To make it possible to simply arrange an underwater inspection machine of unmanned type at a low cost in a plant already constructed, by removably incorporating a housing pipe in which the underwater inspection machine is contained, in a manhole already formed outside of a draft tube or a casing. CONSTITUTION:In a manhole 8 already formed outside of a draft tube 3, there is provided a hosing pipe 11 for containing therein an underwater inspection machine 10. A rotatable driving wheel 11c is arranged in the upper part 11a of the housing pipe 11 by means of a supporting rod 11b, and is engaged with a guide rail 8 crried by the ceiling 8b of the manhole 8 so that the driving wheel 11c runs on the guide rail 8c. Accordingly, the housing pipe 11 is suspended by the guide rail 8c, and may be removed from the side wall of the draft tube 3 by sliding the housing pipe 11 on the coiling 8b of the draft tube 3 in the direction orthogonal to the side wall of the draft tube 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an equipment inspection method and apparatus for pumped storage power plants, and in particular, during periodic inspection of blunts in cultivated land, the present invention can be used to inspect equipment from a distance by remote control while the channel is still full of water. The present invention relates to a method and apparatus capable of inspecting waste or casing in a short period of time.

In recent years, with the development of industry, each press plant equipment is required to have higher performance and reliability. In particular, in highly public power generation plants such as hydropower, thermal power, and nuclear power, failure of such power plants may disrupt the stable supply of electricity and immediately have a serious impact on people's lives in the country. Reliability is required. In addition, to meet the above requirements, periodic inspection of plant equipment is essential.

The conventional inspection method will be explained with reference to FIG. 1, for example, in the case of a bow/pull turbine in a pumped storage power plant.

In Fig. 1, J6 indicates the main shaft of the pump vehicle.

At the lower end of this main shaft l is a runner λ which is rotatable in the runner chamber.
The interior of the lunch room is connected to Draft Team 3 at the bottom. Further, a casing 6 is strung radially outward of the space λ to cover the noid vane 4t and the stay vane O.

Next, manholes t and ♂ are provided on the outside of the 41111 wall of the upper r draft tube 3 and casing B, and the manhole g9g and the draft tube 3 are connected to the 17t casing 6. Inspection on the culm - servant f
fl manhole covers fJ and flL are provided.

From Kono VR
t7 To perform a + inspection, fully close the M indication, drain the draft tube 3 and the casing, and then place a point inside the draft tube 3. A temporary supply floor was set up, and inspection i7 was inspecting each part inside the equipment by entering from the manhole in the side wall of draft tube 3, through temporary floor 2, to runner 2, or through the manhole and into the casing.

However, in pumped storage power plants, due to recent advances in technology and constraints on location, heads are becoming higher, and as a result, the shapes of runners, casings, etc. tend to become uneven, and the cross-section of the flow path tends to become narrower. . Therefore, it has become impossible to perform a complete gamma inspection using the conventional inspection method as described above, and the mechanization of inspection work and remote production of 70m poles have become important issues. The conventional method of draining ice from the water inside the casing and temporarily constructing a
The major drawback of this method was that it required at least several days of additional steps before starting inspections, lowering the plant's operating rate, and that the work was dangerous.

Therefore, the object of the present invention is the above-mentioned 1. The problem with the conventional inspection method has been solved, and the runner and casing are filled with water, and an unmanned underwater inspection machine can be inserted into the area requiring inspection through an existing manhole, allowing easy and remote control. An object of the present invention is to provide a method and device for inspecting equipment for a pumped storage power generation plant, which allows inspection to be completed safely and reliably in a short time.

In order to achieve the above object, a pumped storage power plant equipment inspection method according to the present invention scans an underwater inspection device consisting of an underwater television camera and a flaw detector along the inner wall surface of the draft tube or casing of a hydraulic machine in a water-filled state. 15. The food inspection machine is configured to perform underwater inspection by remote control, and after the inspection is completed, the food inspection machine is stored outside the manhole entrance on the side wall of the draft tube or the casing. ing.

In addition, the equipment inspection device for a Yangsui production plant according to the present invention includes an underwater inspection joint such as an underwater television camera and a flaw detector, and a multi-jointed structure that supports the underwater inspection device so that it can be guided in any direction within the flow path. An arm, a storage pipe with one end removably open to the draft tube of the hydraulic camphor and a manhole entrance on the side wall of the casing, and capable of storing the above-mentioned underwater inspection machine, and the multi-jointed arm connected to the hydraulic machine from the storage pipe in -F. The present invention is characterized in that it is provided with a feeding mechanism that can be moved into and out of the flow path, and a remote monitoring and control device that can operate this feeding mechanism from a distance.

Hereinafter, an embodiment of the equipment inspection method and apparatus for a pumped storage power plant according to the present invention will be described with reference to FIGS. 2 to 5, in which the same parts as in FIG. do.

In FIG. 2, a storage pipe // for storing the underwater inspection device 10 is provided in an existing manhole r outside the draft cheep 3, and this storage pipe l/ is a horizontally long cylinder, The tube axis is provided so as to be perpendicular to the side wall of the draft tube. In addition, there are support rods //b, //b on the top of the 1, -9 case 1 tube/l case//B.
, //1'+ (See Figures 1-5 and 1-5. /(! engages with the guide rail ♂C provided on the manhole tonneau ceiling !rb and travels on the guide rail gC soil. Therefore,
The storage pipe // is suspended and supported by the guide rail fc, and the manhole ceiling rb is connected to the draft tube 301111.
It can slide in a direction perpendicular to the wall and can be attached to and detached from the side wall of the draft chive 3. The connection end of this storage pipe// to the draft cheese 3 opens into an existing manhole entrance/exit area a provided on the side wall of the draft cheese, and the underwater inspection device 10 is inserted through this opening ra. It is possible to enter and exit the draft chamber 3.

Similarly, the existing manhole r outside the casing 6
Several containment pipes, including those shown in // , /
/ , , , , // are arranged, and an underwater inspection device 10 is housed inside each one.

These underwater inspection devices 10 include an ice television camera 10 and an ultrasonic flaw detector 10 having a floodlight (not shown).
Hold b at tip/ri a1. The multi-joint arm 12 and the feed mechanism/3 are installed.
Accordingly, from inside the storage pipe //, the manhole entrance/exit area a can be used to enter into the draft chamber 3 I, and then retreat into the storage pipe ll to be accommodated.

This σ) type of operation is performed by the famous underwater surveying machines 10, 10,...
・In order to give instructions to the pump Mizuura control room IQ, the control cable /I is routed from the remote monitoring and control device 15 installed in the pump Mizuura control room IQ through the pipe 17 embedded in the concrete wall /6 to the feed mechanism /3 and the underwater It is connected to the TV camera/(1&, etc.), and control and inspection signals and video signals are sent and received.

The configuration of this underwater inspection device io will be explained in further detail with reference to FIGS. 3 to 5J.

A frame /q that is slidable in the pipe axis direction is provided inside the storage pipe // that houses the underwater inspection device 10, and a hydraulic cylinder 20 fixed to this frame /9 is attached to the cylinder rond 2/. One end is locked with two clevises provided at the rear end of the storage pipe//(i).Also, this frame/
q has a pair of guides), 3FL and one end of 231) fixed]1. The other ends vC of the guides la and JJb are provided with a storage pipe lid //θ.

Furthermore, another hydraulic cylinder 2t is attached to the frame lde.
/ is fixed, the tip of the rond 25 of this hydraulic cylinder J is connected to the base 2A, and the pace 2A is connected to the guides 2, 7a.
Oyohi 2Jb is now referred to as a contact motion. Sot2
The multi-joint arm 1.2 supported on the upper surface of this base, 2, is covered by a bellows, and between each
/! b.

/2b, . . . /20, it is configured to be able to move in the directions indicated by arrows x and y in Fig. J according to the control signal.

Next, the device inspection method according to the present invention configured as described above will be explained.

First, after stopping the operation of the pump-turbine, and with ice filling inside the main engine, a control signal is sent from the control room/lI by the remote monitoring control rack ``fits'' to operate the hydraulic cylinder 20. Then, the frame /q fixed to the cylinder is moved in the direction of the manhole entrance/exit Roy a, and guided to the inside center of the draft chive 3 or the casing t, 2ja and 2. ? Make the tip of b stick out. Next, the hydraulic cylinder 24/ is activated to slide the pace 26 that holds the multi-joint arm 12 along the guide unit Q7b as shown in FIG. Existing manhole access D from
t'a is introduced into the draft tube 3 or casing 6 through the eaves. In the control room/4I, images sent from the underwater television camera/Ca are sent to the remote monitoring control device/3tf.
(72t) of each joint of the multi-jointed arm 12 while looking at both sides of the monitor TV.

.../, 2b is operated to scan the inner wall surface of the draft tube 3 or the casing t. Taking runner inspection as an example, move the multi-joint arm tip/2a to the required inspection position as shown by the two-dot chain line in Figure 3, and move the flaw detector lOb held at the arm tip/2a to the runner. It is pressed against the inner wall surface to perform a non-destructive inspection and to observe the details using an underwater television camera/Ca. If, for example, an ultrasonic flaw detector is used as the flaw detector, the equipment becomes simpler because the flaw detection is carried out underwater and there is no need to supply a couplant. In addition, if necessary, television images can be recorded on videotape.
It can also be used as reference material for later consideration.

When the inspection is finished and the plant is to be put into normal operation, the underwater inspection device 10 is retreated and stored into the storage pipe l/ in the manhole g by the reverse procedure of the above explanation. Guide, Z
The lid l/e fixed to the tip of Ja and 23b fits into the manhole entrance/exit ♂a, and the surface of the lid//θ constitutes part of the draft tube 3 or the inner wall of the casing B, so that the flow inside the main machine is prevented. The storage pipe/l and the inside of the manhole t are completely isolated from each other.

If a defective part is found during the above inspection and it is necessary for people to enter the pond waterway, the manhole entrance,
l'aK Remove the connected storage pipe // case // &,
The case//& is moved backward along the guide rail b, the water in the flow path is drained, and a person can enter the flow path through a manhole or the like to perform repair work.

In addition, in this embodiment, the underwater inspection machine IO has a multi-joint arm/,
2 was used, however, other means such as a floating body that can move underwater may also be used.

As is clear from the above deception, according to the present invention, the containment pipe housing the underwater inspection machine is removably installed inside the existing manhole of the draft pipe or the casing. An unmanned underwater inspection machine can be easily and inexpensively installed in an existing FV plant, and 1. People can enter and exit the flow path as needed.

In addition, when inspecting the inside of a flow path, this unmanned underwater inspection machine is moved into a draft chimney or casing through a manhole entrance using an ice-filled rope, and the tip of the multi-jointed arm is moved to the required position using remote control. We made it possible to inspect the M11 section using an underwater television camera and flaw detector.
There is no need to drain the water in the flow path, temporary scaffolding for work can be set up on the lower wall, and remote monitoring and control allows detailed inspections to be carried out safely and easily, significantly shortening the inspection period. By doing so, it is also possible to improve the operation rate of the plant. Furthermore, by using the miniaturized multi-jointed arm, it is also possible to inspect the flow path of narrow high-head pump turbines.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of a pump length indicated by a conventional flow path inspection method, Figs. 2 and 2 are longitudinal cross-sectional views of a pump-turbine showing an embodiment of the present invention, and Fig. 3 is from the same book as Fig. The transverse cross-sectional views showing details of one embodiment of the invention, FIGS. -...Runner, 3...Draft tube, t...
casing,! ... Manhole, fa... Manhole entrance, 10... Underwater inspection machine, / (7a... Underwater TV camera, 10b... Flaw detector, /ka... Storage pipe,
lko...multi-jointed arm, /komi...joint, /3...
- Feeding mechanism, 15... remote monitoring control device. Applicant's agent Kiyoshi Inomata (/3)

Claims (1)

[Scope of Claims] / An underwater inspection device consisting of an underwater television camera and an underwater camera is scanned along the inner wall surface of the draft chevre or casing of a water-filled hydraulic machine, and by remote control. A method for inspecting equipment in a Yangbing plant, characterized in that the inspection is carried out underwater, and after the inspection is completed, the inspection machine is stored outside the manhole entrance on the side wall of the draft chive or casing. 2. Underwater inspection equipment such as an underwater television camera and flaw detector, a multi-joint arm that supports this underwater inspection equipment so that it can be guided in any direction within the drift vessel, a draft chime of a hydraulic e-shaft, and Casing 4! ! ! One end is removably opened in a manhole entrance/exit of one wall, and it is possible to move the above-mentioned multi-jointed arm into and out of the flow path of the hydraulic machine from the above-mentioned storage pipe. 1. An equipment inspection device for a pumped storage power generation plant, characterized in that it is equipped with a continuous feeding mechanism and a remote monitoring and control device that can operate the feeding mechanism from a distance.