JPH0990084A - Telescopic cylinder type elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator which is capable of inserting from a hand hole into a steam generator of a reactor power plant, elevating between upper tube support plate and lower tube support plate in the specific position of the steam generator, and quickly inspecting the interior by sight and removing the scale on the tube support plate. SOLUTION: This elevator 1 is placed freely expanding between the lowermost elevation and the uppermost elevation of a tube support plate in a steam generator of a reactor power plant. This device 1 has a telescopic cylinder 2 capable of expanding for a plurality of steps and a support stage 4 to which the lower end of the telescopic cylinder 2 is fixed and a plurality of running rollers in the left and right and a support roller at the bottom end are provided. This device 1 is movable on running rails 9 spanned over hand holes facing to each other in the steam generator 10 with running rollers of the support stage 4. This device 1 is carried in the steam generator 10 with a wire bound to the device through the hand hole along the running rails 9 and stood vertically.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a scale removing device for a tube support plate in a steam generator of a nuclear power plant, an elevating device for a secondary visual inspection tool of the steam generator of a nuclear power plant, etc. Lifting equipment.

[0002]

2. Description of the Related Art FIG. 6 shows the structure of a steam generator.
As shown in FIG. 6, the steam generator 10 has a tube sheet 17
Has a large number of inverted U-shaped heat transfer tubes 16 of which both ends are fixed, and the heat transfer tubes 16 are supported by BEC holes 20 of a tube support plate 11 arranged appropriately 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 spraying high-pressure water by an operator operating a high-pressure hose from a hand hole (inspection hole) 18 provided in various places on the outer periphery of the steam generator 10, or as shown in FIG. As described above, the 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 apparatus shown in FIG.
And a second boom 26 rotatably connected thereto, both of which can be inserted through the handhole (inspection hole) 18, and by rotating the second boom 26 with respect to the first boom 25, the heat transfer tubes 16 are connected to each other. Can take a vertical position.

A CCD that can pan and tilt at the tip of the boom
Since it has a camera, it can guide you to any address, remove dirt, and perform visual inspection. In addition, the second boom 26
Since it is equipped with a large number of telescopic members, it can guide to high-altitude support plates.

[0006]

As shown in FIG. 6, in order to remove the scale 21 of the tube support plate 11 of the steam generator 10, conventionally, handholes are provided at various places on the outer circumference of the steam generator 10. An operator inserted a high-pressure hose through the (inspection hole) 18 and removed the scale 21 while operating it, but there were the following problems.

That is, the handhole is in the first and second support plates (some of which are in the seventh support plate), and the scale of the third to sixth or seventh support plates cannot be removed. In addition, the conventional scale removal cannot be performed sufficiently because the scale is manually operated by an operator, and moreover, a lot of labor and a long time are required for the manual work.

Further, in the work using the apparatus shown in FIG. 7, since the boom is erected and the high pressure water nozzle is guided and controlled only by the CCD camera provided at the tip of the boom 26, the high pressure water nozzle There is a problem that the verticality of the boom cannot be maintained because there is no lock mechanism that fixes the position of the standing boom, as well as accurate positioning is not possible.

The present invention is proposed in view of the above-mentioned problems, and can be inserted into a steam generator of a nuclear power plant from a handhole, and the pipe support plate from the uppermost stage to the lowermost stage at a predetermined position in the steam generator. It is an object of the present invention to provide an elevating device that can ascend / descend to a pipe support plate and can perform visual inspection of the inside and scale removal of the pipe support plate reliably and quickly.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a plurality of telescopic cylinders that can be expanded and contracted in a plurality of stages, and a lower end of the telescopic cylinder is fixed, and a plurality of running rollers and right and left rollers. Provided is an elevating device having a support base provided with a support roller at its lower end.

This elevating device can be moved by the traveling rollers of the support table on the traveling rails spanning the handholes facing the steam generator, and the elevating device can be moved from the handhole by the wire tied to it. It is carried into the steam generator along the traveling rail.

The elevating device thus carried into the steam generator is vertically raised by the wire, and the telesco cylinder is expanded and contracted at a predetermined position to move the upper and lower pipe support plates up and down. It is configured to be able to move up and down.

The telescopic cylinder type lifting device of the present invention comprises:
With the configuration as described above, a plurality of telescopic cylinders capable of expanding and contracting in, for example, 11 stages, can vertically move up and down the distance from the lowermost stage to the uppermost stage tube support plate, and at the time of reduction. The height can be expanded and contracted to the height above the bottom tube support plate.

Further, the lifting device according to the present invention can be easily carried in from the steam generator handhole (inspection hole) and can be vertically raised and raised. For example, a manual winch provided on both sides of the steam generator handhole. By positioning the wire tied to the lifting device, complete positioning and fixing can be performed.

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

Therefore, when the telescopic cylinder is equipped with a telescopic arm and a nozzle device and applied to a scale removing device, it is possible to completely remove the scale accumulated on the tube supporting plate of each stage in the steam generator. However, if a camera for observing the inside of the tube group is attached to the tip of the telescopic cylinder to make an observation device, the inside of the tube group can be observed accurately.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a telescopic cylinder type lifting device according to the present invention will be specifically described based on the embodiment shown in FIGS. In the following embodiments, the same components as those of the conventional device shown in FIGS. 6 and 7 are designated by the same reference numerals for the sake of simplicity.

In FIGS. 1 and 2, the lifting device 1 includes 11
It has a plurality of telescopic cylinders 2 which can be expanded and contracted in stages, and the upper end of each is fixed to a single flange 3 and the lower end is fixed to a single support base 4 having pressure guiding holes 15. The traveling rail 9 is bridged across the handholes (inspection holes) 18 of the steam generator 10 which face each other.

As shown in FIG. 3, the support base 4 has a support carriage 4-1. The support carriage 4-1 has four traveling rollers 13 provided on each of the left and right sides thereof as shown in FIG. As described above, it is engaged with the traveling rail 9 and is movable along the traveling rail 9.

Thus, the support base 4 is rotatably attached to the support carriage 4-1 which is movable along the traveling rail 9 by the support shaft 4-2. Therefore, the support base 4 together with the telescopic cylinder 2 supports the support shaft 4 with respect to the support carriage 4-1.
It can be rotated around -2 and can be erected from a state in which it is laid parallel to the traveling rail 9 to a position perpendicular to the traveling rail 9.

In this way, the telescopic cylinder 2 which can travel on the traveling rail 9 together with the support 4 is connected to the lower end and the upper end of the cylinder raising wire 6a, and the upper end flange 3 is connected to the cylinder contracting wire 6b. The cylinder contracting wire 6b passes through the outside of the telescopic cylinder 2 and is guided from the lower end by a pulley 7 '.

These cylinder raising wires 6a
The cylinder contracting wire 6b and the cylinder contracting wire 6b are connected via a pulley 7 to a plurality of cylinder raising manual winches 5a and cylinder contracting manual winches 5b installed on a winch mount 8 outside the handhole 18, respectively. ing.

The support base 4, to which the lower end of the telescopic cylinder 2 is fixed, is supported on the lower ends of the running rollers 13 provided on the left and right of the frame 12 as shown in detail in FIGS. 3 and 4. The support roller 1 having a 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 be expanded and contracted in stages, and is extended to the uppermost tube support plate 11 by the fluid pressure introduced from the pressure guiding hole 15, and the lowermost tube support plate 1 is drawn by pulling the cylinder contraction wire 6b.
Can be reduced to 1 above.

When the elevating device 1 is used as an elevating device for a steam generator scale removing device, as shown in FIG. 5, the telescopic cylinder 2 has a single flange 3 on which a telescopic arm 23, a nozzle device 22, and a visual check are provided. Wear inspection tools.

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

At a specific position in the steam generator 10, the cylinder raising wire 5a is operated by the cylinder raising manual winch 5a to rotate the support base 4 and the telescopic cylinder 2 around the support shaft 4-2. And vertically erect, and the cylinder erecting wire 6a is attached to each other and fixed.

In the telescopic cylinder 2 thus vertically arranged, in the telescopic cylinder 2, the traveling roller 13 of the supporting carriage 4-1 rolls along the traveling rail 9 and the supporting roller 14 causes the supporting roller 14 to move. By rolling over
When the wire 6a is pulled, the steam generator 1 is moved along the traveling rail 9.
Can move in 0.

As described above, in order to put the scale removing device adopting the lifting device of the present invention in the steam generator 10,
With the telescopic arm 23 contracted, the lifting device 1 is carried in from the handhole 18 along the traveling rail 9 by the manual winch 5a (FIG. 1) and vertically raised at a prescribed position to support the support roller 14 at the lower end by pipe support. Hit the plate 11, wire 6a
Then, the telescopic cylinder 2 is extended upward through the flow slot 24 of the tube support plate 11. In order to contract the expanded telescopic cylinder 2, the cylinder contraction manual winch 5b is operated to activate the cylinder contraction wire 6.
Pull down with b.

In this way, the distance from the lowermost tube support plate 11 to the uppermost tube is extended, and the height when reduced is within the height above the lowermost tube support plate 11. This makes it possible to completely remove the scale of each tube support plate 11.

The present invention has been specifically described above based on the illustrated embodiments, but the present invention is not limited to these embodiments, and various configurations are possible within the scope of the present invention shown in the claims. It goes without saying that changes may be made.

For example, although a manual winch is used to operate the wire in the above-mentioned embodiment, this may be an appropriate means such as an electric winch, and in the above-mentioned embodiment, the nozzle device 22 or the like is provided at the upper end of the telescopic cylinder 2. Although it has been shown that it is mounted and used as a scale removing device, 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 constituted by providing a supporting base having a traveling roller and a supporting roller at the lower end of a telescopic cylinder capable of expanding and contracting in a plurality of stages is provided to face a steam generator. In order to fix it in the steam generator by bringing in the wires on the traveling rail that has been passed over the handhole (inspection hole) by multiple hand-operated winch mechanisms installed near the handhole and raising them, and then attaching the wires. , Accurate positioning is possible.

By expanding and contracting the telescopic cylinder on a predetermined position of the traveling rail, the space between the lowermost tube support plate and the uppermost tube support plate in the steam generator can be expanded and contracted to perform desired work. it can.

For example, a scale removing device is constructed which is capable of completely removing the scale accumulated on the tube support plate at each stage by mounting an expandable arm, a nozzle device, a visual inspection tool, etc. at the tip of the telescopic cylinder. Therefore, it is extremely effective in industry. Further, by mounting a camera mechanism for observing the inside of the tube group and a feeding device for inserting the camera into the tube group at the tip of the telescopic cylinder, it can be used as an apparatus for observing the inside of the tube group.

[Brief description of 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 in 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 shown in FIG.

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

FIG. 4 is a side view of the support base shown in FIG.

5 is a perspective view showing an operating state of a scale removing device of a steam generator using the lifting device shown in FIGS. 1 and 2. FIG.

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

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

[Explanation of symbols]

 1 Lifting device 2 Telesco cylinder 3 Flange 4 Support base 4-1 Support carriage 4-2 Support shaft 5a Cylinder raising manual winch 5b Cylinder contraction manual winch 6a Cylinder raising wire 6b Cylinder contraction wire 7 Pulley 8 winch mounting Base 9 Traveling rail 10 Steam generator 11 Pipe support plate 12 Frame 13 Traveling roller 14 Support roller 15 Pressure guide hole 16 Heat transfer tube 17 Tube plate 18 Hand hole (inspection hole) 19 Flow path hole 20 BEC hole 21 Scale 22 Nozzle device 23 Expansion and contraction Arm 24 flow slot

Continued Front Page (72) Inventor Hiromasa Kamei 2-1-1 Niihama, Arai-cho, Takasago-shi, Hyogo Mitsubishi Heavy Industries Ltd. Takasago Research Center

Claims (1)

[Claims] 1. An elevating device in a steam generator of a nuclear power plant, comprising a plurality of telescopic cylinders capable of expanding and contracting in a plurality of stages, a lower end of the telescopic cylinder being fixed, and a plurality of traveling rollers on the left and right and a lowermost end. Comprising 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 over the handholes of the steam generator facing each other,
The lifting device is carried into the steam generator from the handhole along the traveling rail by a wire tied to the lifting device and vertically erected, and the telesco cylinder is expanded and contracted at a predetermined position so that the upper tube support plate is extended. A telesco cylinder type lifting device, which is configured to be vertically movable from a pipe support plate to a lower pipe support plate.