JP3085888B2 - Telescopic cylinder type lifting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic cylinder type device applied to a scale removing device for a tube support plate in a steam generator of a nuclear power plant and a lifting device for a secondary visual inspection tool of a steam generator of a nuclear power plant. It relates to a lifting device.

[0002]

2. Description of the Related Art FIG. 6 shows a structure of a steam generator.
As can be seen in FIG. 6, the steam generator 10 is
Has a large number of inverted U-shaped heat transfer tubes 16 having both ends fixed, and the heat transfer tubes 16 are supported by BEC holes 20 of a tube support plate 11 appropriately arranged as shown in FIG. .

A scale 21 may be deposited near the BEC hole 20 of the tube support plate 11. Conventionally, this scale 21 is removed by hand-operating a high-pressure hose and spraying high-pressure water from hand holes (inspection holes) 18 provided at various locations on the outer periphery of the steam generator 10, or as shown in FIG. As described above, a high-pressure water nozzle was attached to the tip of the support plate visual inspection device to remove the scale of the support plate at a high place.

The visual inspection device shown in FIG.
And a second boom 26 rotatably coupled thereto, both of which can be inserted through a handhole (inspection hole) 18 and between the heat transfer tubes 16 by rotating the second boom 26 with respect to the first boom 25. Can take a vertical position.

At the end of the boom, a CCD that can be panned and tilted
Since the camera is attached, guidance to an arbitrary address, removal of dirt, and visual inspection can be performed. Also, the second boom 26
Is equipped with a large number of telescoping members so that it can be guided to a high place support plate.

[0006]

As shown in FIG. 6, in order to remove the scale 21 of the pipe support plate 11 of the steam generator 10, conventionally, there are provided handholes provided at various locations on the outer periphery of the steam generator 10. (Inspection hole) The operator inserts a high-pressure hose through 18 and removes the scale 21 while operating it. However, the following problem arises.

That is, the handholes are located on the first and second support plates (there are some in the seventh support plate), and the scales of the third to sixth or seventh support plates cannot be removed. In addition, the conventional scale removal is a manual operation of a worker, so that the scale cannot be sufficiently removed, and furthermore, a large amount of labor and a long time are required for the manual work.

In the operation using the apparatus shown in FIG. 7, the boom is erected by relying only on the CCD camera provided at the tip of the boom 26, and the high pressure water nozzle is guided and controlled. There is a problem that accurate positioning cannot be performed, and that there is no lock mechanism for fixing the position of the upright boom, so that the verticality of the boom cannot be maintained.

The present invention is proposed in view of the above-mentioned problems, and can be inserted from a handhole into a steam generator of a nuclear power plant, and can be inserted at a predetermined position in the steam generator from a top pipe support plate to a bottom pipe. It is an object of the present invention to provide an elevating device capable of ascending and descending to the tube support plate, and performing a visual inspection of the inside and scale removal of the tube support plate reliably and quickly.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a plurality of telescopic cylinders which can be extended and retracted in a plurality of stages, and a plurality of traveling rollers which are fixed at the lower end of the telescopic cylinder and are provided on the left and right. Provided is an elevating device having a support table provided with a support roller at a lower end.

The lifting device can be moved by a traveling roller of the support base on a traveling rail passed over an opposing hand hole of the steam generator, and the elevating device is moved from the hand hole by a wire connected thereto. It is carried into the steam generator along the traveling rail.

The lifting device carried into the steam generator in this manner is raised upright by the wire, and the telescopic cylinder is expanded and contracted at a predetermined position to move the telescopic cylinder up and down from the uppermost tube support plate to the lowermost tube support plate. It is configured to be able to move up and down in the direction.

The telescopic cylinder type lifting device according to the present invention comprises:
It is configured as described above, and by a plurality of telescopic cylinders that can be expanded and contracted into a plurality of stages, for example, 11 stages, the distance from the bottom stage to the top stage tube support plate can be raised and lowered in the vertical direction. The height can expand and contract to the height above the bottom tube support plate.

The lifting device according to the present invention is easy to carry in from the handhole (inspection hole) of the steam generator and can be raised upright. For example, a manual winch provided on both sides of the steam generator handhole is used. Complete positioning and fixing can be performed by stretching a wire connected to the lifting device.

Further, in the elevating device according to the present invention, the traveling roller and the supporting roller are provided on the support base below the telescopic cylinder, so that the traveling rail and the lowermost tube supporting plate stably and accurately position the front and rear. You can move.

Therefore, when the telescopic cylinder is equipped with a telescopic arm or a nozzle device at the tip of the telescopic cylinder and applied to a scale removing device, it is possible to completely remove the scale deposited on the tube support plates at each stage in the steam generator. It is possible to perform accurate in-tube observation when a camera or the like for in-tube observation is attached to the end of the telescopic cylinder to form an observation device.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a telescopic cylinder type lifting device according to the present invention will be described in detail with reference to an embodiment shown in FIGS. In the following embodiments, the same components as those of the conventional apparatus shown in FIGS. 6 and 7 are denoted by the same reference numerals for simplification of description.

In FIG. 1 and FIG.
It has a plurality of telescopic cylinders 2 that can be extended and retracted, each having an upper end fixed to a single flange 3 and a lower end fixed to a single support 4 having a pressure guiding hole 15. The traveling rail 9 is stretched over a hand hole (inspection hole) 18 facing the steam generator 10.

As shown in FIG. 3, the support platform 4 has a support platform 4-1. The support platform 4-1 has four running rollers 13 provided on the right and left sides of the support platform 4-1, as shown in FIG. So that it can move along the running rail 9.

As described above, the support base 4 is rotatably mounted on the support carriage 4-1 movable along the traveling rail 9 by the support shaft 4-2. Therefore, the support base 4 and the telescopic cylinder 2 are supported by the support shaft 4 with respect to the support carriage 4-1.
−2, and can be raised from a state of being laid parallel to the traveling rail 9 to a position perpendicular to the traveling rail 9.

As described above, the telescopic cylinder 2 which can travel on the traveling rail 9 together with the support 4 is connected to a cylinder upright wire 6a at the lower end and upper end thereof, and the cylinder contraction wire 6b is connected to the upper end flange 3. The cylinder contraction wire 6b passes through the outside of the telescopic cylinder 2 and is led out from the lower end by a pulley 7 '.

These cylinder erecting wires 6a
The cylinder contraction wire 6b is connected to a plurality of cylinder erect manual winches 5a and cylinder contraction manual winches 5b installed on the winch mount 8 outside the handhole 18 via pulleys 7, respectively. ing.

The support base 4 to which the lower end of the telescopic cylinder 2 is fixed is supported by running rollers 13 provided on the left and right sides of the frame 12 as shown in FIG. 3 and FIG. The roller 1 having the roller 14
4 can move on the lowermost tube support plate 11.

The telescopic cylinder 2 has a plurality of stages, for example, 11
It can expand and contract in stages, extends to the uppermost tube support plate 11 by the fluid pressure guided from the pressure guiding hole 15, and pulls the cylinder contraction wire 6b to lower the tube support plate 1
Can be reduced up to one.

When the lifting device 1 is used as a lifting device of a descaling device for a steam generator, as shown in FIG. Attach inspection tools.

When using the lifting device 1, the traveling rail 9 is rotated by rotating the support 4 and the telescopic cylinder 2 around the support shaft 4-2 with respect to the support carriage 4-1.
The lifting device 1 is pulled by the wire 6a from the handhole 18 of the steam generator 10 and carried along the traveling rail 9.

Then, at a specific position in the steam generator 10, the supporter 4 and the telescopic cylinder 2 are turned around the support shaft 4-2 by operating the cylinder erecting wire 6a by the cylinder erecting manual winch 5a. The cylinder is raised upright and stuck and fixed with the cylinder uprighting wire 6a.

In the state where the telescopic cylinder 2 is in the vertical state, the running roller 13 of the supporting carriage 4-1 rolls along the running rail 9 and the supporting roller 14 is connected to the tube supporting plate 11 by the telescopic cylinder 2. By rolling up,
When the wire 6a is pulled, the steam generator 1 moves along the running rail 9.
You can move within 0.

As described above, in order to put the scale removing device employing the lifting device of the present invention into the steam generator 10,
With the telescopic arm 23 contracted, the elevating device 1 is carried in from the handhole 18 along the traveling rail 9 by the manual winch 5a (FIG. 1), raised upright at a specified position, and supports the lower supporting roller 14 at the lower end. Wire 6a against plate 11
The telescopic cylinder 2 is extended upward through the flow slot 24 of the tube support plate 11. In order to contract the telescopic cylinder 2 that has been extended, the manual winch 5b for cylinder contraction is operated and the wire 6 for cylinder contraction is operated.
Lower with b.

In this manner, the distance from the lowermost stage to the uppermost tube support plate 11 is extended, and the height when the contraction is made is within the height on the lowermost tube support plate 11. The scale of each tube support plate 11 can be completely removed.

As described above, the present invention has been specifically described based on the illustrated embodiments. However, the present invention is not limited to these embodiments, and various modifications may be made within the scope of the present invention described in the appended claims. Needless to say, changes may be made.

For example, in the above-described embodiment, a manual winch is used to operate the wire. However, this may be performed by an appropriate means such as an electric winch. In the above-described embodiment, the nozzle device 22 or the like may be provided at the upper end of the telescopic cylinder 2. Although the case where the camera is used as a scale removing device is shown, it is also possible to attach only a camera or the like to the upper end of the telescopic cylinder 2 and apply it as a secondary visual inspection device of the steam generator.

[0033]

As described above, according to the present invention, an elevating device having a support base having a traveling roller and a supporting roller provided at the lower end of a telescopic cylinder which can be extended and retracted in a plurality of stages is provided. A handrail (inspection hole) that is passed over the running rail is carried in by a plurality of manual winch mechanisms installed near the handhole and wires, etc., and after erecting it, it is fixed in the steam generator by laminating the wires. , Accurate positioning is possible.

The desired operation can be performed by expanding and contracting the telescopic cylinder at a predetermined position on the traveling rail so as to expand and contract between the lowermost tube support plate and the uppermost tube support plate in the steam generator. it can.

For example, by attaching a telescopic arm, a nozzle device, a visual inspection tool, and the like to the tip of the telescopic cylinder, a scale removing device capable of completely removing scale deposited on the tube support plate at each stage is configured. This is extremely effective in industry. Further, by mounting a camera mechanism for observation inside the tube group and a feed device for inserting the camera into the tube group at the tip of the telescopic cylinder, the device can be used as a device for observation inside the tube group.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an elevating device according to an embodiment of the present invention, showing a state in which a telescopic cylinder is laid on a side and carried into a steam generator.

FIG. 2 is an explanatory view showing a state in which a telescopic cylinder is raised in the apparatus of FIG. 1;

FIG. 3 is an enlarged view of a support base in a portion A of FIG. 2;

FIG. 4 is a side view of the support table shown in FIG. 3;

FIG. 5 is a perspective view showing an operation state of a descaling device of a steam generator using the lifting device shown in FIGS. 1 and 2;

6A and 6B are drawings showing the structure of the steam generator, wherein FIG. 6A is a longitudinal sectional view, and FIG. 6B is a partial perspective view of the tube support plate.

FIG. 7 is a side view showing a conventional visual inspection device for a tube support plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elevating device 2 Telescopic cylinder 3 Flange 4 Support stand 4-1 Support carriage 4-2 Support shaft 5a Manual winch for raising cylinder 5b Manual winch for contracting cylinder 6a Wire for raising cylinder 6b Wire for contracting cylinder 7 Pulley 8 winch mounting Table 9 Running rail 10 Steam generator 11 Tube support plate 12 Frame 13 Running roller 14 Support roller 15 Pressure guiding hole 16 Heat transfer tube 17 Tube plate 18 Hand hole (inspection hole) 19 Flow passage hole 20 BEC hole 21 Scale 22 Nozzle device 23 Expansion / contraction Arm 24 flow slot

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Hiromasa Kamei 2-1-1, Shinhama, Arai-machi, Takasago-shi, Hyogo Pref. Inside the Takasago Research Laboratory, Mitsubishi Heavy Industries, Ltd. (56) References JP-A-5-188195 (JP, A) JP-A-61-256316 (JP, A) JP-A-60-242994 (JP, A) JP-A-59-19897 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G21C 17 / 00 F22B 37/48 F28G 15/00 JICST file (JOIS)

Claims (1)

(57) [Claims] 1. A lifting device in a steam generator of a nuclear power plant, comprising: a plurality of telescopic cylinders extendable in a plurality of stages; a lower end of the telescopic cylinder being fixed; It has a support base provided with a support roller, the elevating device is movable by a travel roller of the support base on a travel rail spanned across an opposing hand hole of the steam generator,
The lifting device is carried into the steam generator from the hand hole along the traveling rail by the wire tied to the elevating device, and is raised vertically, and by expanding and contracting the telescopic cylinder at a predetermined position, the upper pipe support plate is provided. A telescopic cylinder-type elevating device, which is configured to be able to ascend and descend in a vertical direction from a pipe support plate to a lower tube support plate.