JP2714682B2 - Polishing device for fuselage flange sheet surface - Google Patents

Description

The present invention relates to an apparatus for polishing a body surface of a fuselage flange,
More particularly, the present invention relates to an apparatus for removing dust such as silver plating of an O-ring adhered to a flange surface of a reactor pressure vessel body.

[Conventional technology]

As shown in FIGS. 5, 6, and 7, the reactor pressure vessel connects the upper lid 51 and the body 52 with stud bolts 54 and nuts 55 via O-rings (53 in FIG. 8). It has a structure that seals the entire pressure vessel.

The stud bolt 54 is connected by the engagement of the thread 58 of the body flange 57 and the thread 58 of the stud bolt 54. Further, the stud bolt 54 penetrates through a through hole 60 formed in the upper lid flange 59, and a screw portion at the other end of the stud bolt 54 is provided.
61 projects above the upper lid flange 59. This screw part 61
A washer 56 and a nut 55 are attached to the stud bolt 54 via an O-ring (53 in FIG. 8) by the tightening force.
The upper lid 51 and the body 52 are sealed.

FIG. 8 is an enlarged detail view of a portion B in FIG. 7, and shows a state in which the reactor pressure vessel is sealed by an O-ring 53 on a seat surface. The O-ring 53 is attached to an O-ring attachment groove 63 formed on the seat surface 62 of the upper lid flange 59, and the body flange
It is pressed against the 57 sheet surface 62. Thereafter, the O-ring 53 is crushed into an elliptical shape by tightening the body flange 57 and the upper lid flange 59 with the stud bolt 54, and the seat surfaces 62, 62 are seated by the reaction force. The outer surface of the O-ring 53 is plated with silver, and the silver plating is applied to the O-ring 53, the seat surface 62, and the O-ring mounting groove 63.
To fill the gap with the surface and improve the seat performance.

By the way, the reactor pressure vessel is opened and closed once a year for regular inspection, and prior to closing the upper cover 51,
The O-ring 53 is replaced with a new one. At this time, dust such as silver plating adhered to the sheet surface 62 of the body flange 57 needs to be removed, and the sheet surface 62 needs to be cleaned and polished. Further, it is necessary to clean and polish the O-ring mounting groove 63 of the upper lid flange 59 in the same manner.

Grinding and cleaning operations are performed with the seat surface 62 of the fuselage flange 57 filled with water in a reactor pressure vessel arranged in a reactor building below the operation floor. But,
Stud bolts are seated on the fuselage flange 57 on the seat surface 62
Since the sheet surface 62 is positioned inside the stud bolt 54, the work of polishing and cleaning the seat surface 62 must be performed manually between the stud bolts 54, 54. For this reason, workers have lowered their posture to minimize exposure from inside the reactor pressure vessel, put their hands through the gap between stud bolts 54, 54, and cleaned and polished directly using a whetstone .

It should be noted that those related to this type of apparatus include those described in Japanese Utility Model Laid-Open No. 60-134200, Japanese Utility Model Application No. 61-97786, and the like.

[Problems to be solved by the invention]

In the prior art, when cleaning and polishing the seat surface 62 of the fuselage flange 57, the worker is forced to take an unreasonable posture during work or at the time of checking after the work, and the worker is in a highly contaminated area. Are wearing protective clothing and dust masks, and furthermore, they have to put their hands through the narrow gaps between the stud bolts 54, 54, resulting in extremely poor work efficiency. In addition, there is also a problem that the worker is exposed to the body due to scattering of dust due to cleaning.

On the other hand, in Japanese Utility Model Application Laid-Open No. 60-134200, a scraper for peeling off extraneous matter is provided on a traveling carriage mounted on a flange surface so as to be able to travel freely, and an extraneous matter disposed near the scraper and exfoliated. And a vacuum cleaner for sucking
There is shown a rotary brush provided at the subsequent stage of the scraper to grind the flange surface, and a flange cleaning device provided at the subsequent stage of the rotary brush and provided with a removing means for removing deposits on the flange.

However, in the above-described apparatus, the condition that the stud bolts 54 stand on the outer periphery of the flange sheet surface 62 of the body flange 52 of the reactor pressure vessel is not sufficiently considered. For this reason, after removing all stud bolts 54,
Although it is possible to clean and polish the seat surface 62, the work of removing and re-inserting the stud bolts 54 may result in radiation exposure of new workers and increase the overall working time. Not so economical and efficient.

On the other hand, Japanese Utility Model Application No. 61-097786 discloses that a telescopic arm is mounted on a gantry mounted on the upper part of a fuselage flange 52 of a reactor pressure vessel, and a cleaning unit is mounted at one end of the telescopic arm. It has a structure that rotates around the center of 62. The cleaning unit includes a wire brush for cleaning the sheet surface 62, an electric motor for rotating the wire brush, a dust cover for preventing dust from scattering, a suction port, and the like. In this apparatus, the stud bolts 54 standing on the outer periphery of the seat surface 62 are taken into consideration, and the cleaning device can be set from the inside of the reactor pressure vessel via the gantry. However, in order to set up the cleaning device, it is necessary to set a large gantry of the same size as the diameter of the reactor pressure vessel at the time of work, which causes radiation exposure of new workers for setting the gantry, It is not economical and efficient because the working time is long. Furthermore, after the work is completed, it is necessary to secure a space for storing a large gantry.

SUMMARY OF THE INVENTION An object of the present invention is to provide a flange sheet surface polishing apparatus capable of not only mechanizing and automating the operation, but also improving the cleaning operation efficiency of the flange sheet surface where bolts of a reactor pressure vessel and the like stand up and reducing the exposure of workers. Is to do.

[Means for solving the problem]

The above-mentioned object is to provide a reciprocating slider portion having a plurality of reciprocating sliders capable of grasping and fixing the body flange and releasing the grasp fixing state with respect to the body flange, and alternately changing the relative positions of the plurality of reciprocating sliders. This is achieved by making the reciprocating slider portion movable along the sheet surface and mounting a polishing unit for polishing the sheet surface and a suction mechanism for sucking dust and the like on the reciprocating slider portion.

[Action]

When one of the reciprocating sliders is gripped and fixed to the fuselage flange, the other reciprocating slider is released from the gripping fixed state with respect to the fuselage flange, and in this state, the relative position of the two reciprocating sliders is changed, for example, by an air cylinder or the like. To change through. By performing such operations alternately, the polishing unit and the suction mechanism mounted on the reciprocating cylinder move along the sheet surface to remove deposits such as silver plating on the sheet surface.

When the reciprocating slider moves on the seat surface, the grip and fixed state with respect to the fuselage flange is released, and if the stud bolt is not interposed, naturally, even if the stud bolt stands, it can be moved without any trouble.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an overall plan view showing one embodiment of a body flange polishing apparatus of the present invention. The apparatus for polishing the body surface of the body flange includes a first reciprocating slider portion 1a, 1
b and second reciprocating slider portions 2a and 2b, the first reciprocating slider portion 1a and the first reciprocating slider portion 1b are connected by a connector 3, and the second reciprocating slider portion 2a and the second reciprocating slider portion
2b is connected by the connecting tool 4.

An air cylinder 5A is installed between the first reciprocating slider portion 1b and the second reciprocating slider portion 2b, thereby forming an integrated structure by the connecting member 3, and the first reciprocating slider portion 1a, The distance between the first reciprocating slider portions 2a and 2b, which are formed integrally by the connecting tool 4 and are fixed to each other, can be adjusted by moving one of the slider portions along the guide rail 6. It has become. In FIG. 1, the first reciprocating slider portions 1a and 1b grip and fix the body flange 57, and when the air cylinder 5A is operated, the second reciprocating slider portions 2a and 2b
b moves together to the right in the drawing, and the distance between the two cylinders is adjusted.

Therefore, in the apparatus for polishing the sheet surface of the body flange of the present invention, the reciprocating slider parts alternately move like a so-called scale insect. The polishing unit 5B is movable integrally with the first reciprocating slider part, and
It can be self-propelled along.

FIG. 2 is a side view of a main part of the apparatus for polishing a fuselage flange sheet surface according to the present invention, showing a state of a side surface of a first reciprocating slider portion 1b, a second reciprocating slider portion 2a, and a polishing unit 5B.

As shown in FIG. 2, the second reciprocating slider portion 2a (and 2
b) The air cylinder 18 having one end pivotally attached to the guide rail 15 is inclined upward, while the first reciprocating slider part 1b
In (and 1a), the air cylinder 18 having one end pivotally connected to the guide rail 15 is positioned substantially horizontally, and a flange gripping claw (not shown) grips and fixes the body flange. .

The polishing unit 5B includes a unit main body 7 through which a guide rail 6 is inserted. The unit main body 7 has a driving wheel 8 driven by a motor 9 and a rotary grindstone 10 driven by a motor 11 mounted thereon. A dust collection tube 12 having an opening near the grindstone 10 is connected.

Since the structure of each of the first reciprocating slider portions 1a and 1b and the second reciprocating slider portions 2a and 2b is substantially the same,
The structure will be described with reference to the drawings.

The reciprocating slider portion is provided with a guide guide 14 that moves along the sheet surface of the body flange 57 via the rotating roller 13, and the guide guide 14 has a pair of L-shaped guide rails 15.
Has been fixed. A pair of guide rails 15 has a slider 16
Is slidably mounted, and the slider 16 has a pair of arms 17.
One end of the air cylinder 18 is pivotally connected to an intermediate portion in the longitudinal direction of the slider 16 and one end of the guide rail 15. The arm 17 has an arm 19 having an elastic member 21 such as rubber at the distal end, and both ends of the air cylinder 20 are pivotally connected between an end of the arm 17 and a pivot portion of the air cylinder 18 to the arm 17. ing.

Next, the operation of the apparatus for polishing a body flange sheet surface configured as described above will be described.

At the time of refueling, the stud bolt 54 is loosened and the upper mirror 51 is opened, and the inspection and maintenance work of the seat surface 62 of the body flange 57 shown in FIG. 8 is performed. In this case, the upper lid flange of the upper mirror 51
59 has two O-ring mounting grooves 53, 53, in which O-rings 63, 63 coated with silver plating are mounted. When the upper mirror 1 is opened, the silver plating is applied to the body flange. 57 is attached to the sheet surface 62. The polishing apparatus of this embodiment moves along the sheet surface of the body flange 57 as shown in FIG. 1 in order to remove deposits such as silver plating as described above.

In FIG. 1, a first reciprocating slider portion 1a is shown. 1b is fixed by grasping and fixing the body flange 57.

In this state, when the drive shaft 8 is rotated by the motor 9 in the polishing unit 5B, the unit body 7 moves along the guide rail 6 in the direction indicated by the arrow in the drawing, and moves on the sheet surface. Then, the rotating grindstone 10 is rotated by the motor 11, and the sheet surface is polished, and the deposit such as silver plating is removed from the sheet surface. The removed deposits such as silver plating are sucked and removed through the dust collection tube 12 by a suction device (not shown).

When performing the polishing operation by moving the sheet surface between the second reciprocating slider part 2a and the first reciprocating slider part 1b in FIG. 2, the first reciprocating slider part 1b and the second reciprocating slider part 2b Compressed air is introduced into the air cylinder 5A mounted therebetween, and the second reciprocating slider units 2a and 2b move integrally to the right in the drawing.

At this time, the second reciprocating slider portion 2a in FIG.
(And 2b) are in the state shown in FIG. 3. In this state, when compressed air is introduced into the air cylinder 18 and the cylinder rod is extended, the arm 17 rotates about the fulcrum C,
The side surface of the arm 17 abuts on the claw b provided on the slider 16, and the rotation of the arm 17 stops. Therefore, the arm 17 stops in a state where it is inclined at an angle indicated by θ in the figure with respect to the horizontal plane. Here, when the extension operation of the cylinder rod of the air cylinder 18 continues, the slider 16 moves in parallel on the guide rail 15 to the right in the drawing, and the arm 17 inclines to the stud bolt 54 side. Then, when compressed air is introduced into the air cylinder 20 and the cylinder rod is extended, the arm
The pivot 19 rotates about the fulcrum d, as shown in FIG. 4, and the elastic member 21 at the tip of the arm 19 is pressed against the side of the trunk flange 57 to grasp and fix the trunk flange 57.

On the other hand, the first reciprocating slider portion 1b (and
In 1a), the compressed air is introduced into each of the air cylinders 18 and 20 by the reverse operation, and the gripping state on the body flange 57 is released as shown in FIG.
In this case, the arm 17 is locked and fixed on the side surface of the claw a.

Thereafter, when compressed air is introduced into the air cylinder 5A in FIG. 1, the second reciprocating slider portion 2a (and 2b) is fixed, and the first reciprocating slider portion 1b (and 1a) moves on the sheet surface. Then, the polishing unit 5B moves between the first reciprocating slider portion 2a and the first reciprocating slider portion 1b without falling down on the sheet surface, and polishes the sheet surface.

Thereafter, similarly, the first reciprocating slider portions 1a, 1b and the second reciprocating slider portions 2a, 2b alternately grip the body flange 57, and the polishing apparatus moves the sheet surface by the operation of the air cylinder 5A, and the polishing unit 5B Polishes the sheet surface. In these series of operations, compressed air is introduced into each of the air cylinders 5A, 18 and 20 at a predetermined timing by an air compressor and a control valve installed in an external unit (not shown).

〔The invention's effect〕

As described above, according to the present invention, even when obstacles such as stud bolts intervene in the reactor pressure vessel body fuselage, the reciprocating slider portion moves the sheet surface without hindrance. Since the mechanism can move along the sheet surface to polish the sheet surface, the work of polishing the body surface of the fuselage flange can be performed automatically, thereby improving the working efficiency and reducing the exposure of the worker.

[Brief description of the drawings]

FIG. 1 is an overall plan view of a body flange polishing apparatus according to the present invention when the apparatus is mounted on the body flange surface, FIG. 2 is a side view of each principal part in FIG. 1, and FIG. First
FIG. 3 (B) is a side view of FIG. 3 (A), FIG. 4 (A) is a view of arrow AA of FIG. 1, and FIG. 4 (B). 4 is a side view of FIG. 4 (A), FIG. 5 is a schematic sectional view of a reactor pressure vessel, FIG. 6 is an enlarged sectional view of a part A of FIG.
FIG. 7 is an enlarged detailed view of FIG. 6, and FIG. 8 is an enlarged detailed view of a portion B in FIG. 1a, 1b: first reciprocating slider portion, 2a, 2b: second reciprocating slider portion, 3: connecting member, 4: connecting member, 5A: air cylinder, 5B: polishing unit, 6: guide rail,
7 Unit body, 8 Drive wheels, 9 Motor
10… rotating whetstone, 11… motor, 12… dust collection tube, 13…
Roller, 14 …… Guide guide, 15 …… Guide rail, 16
... Slider, 17 ... Arm, 18 ... Air cylinder, 19 ... Arm, 20 ... Air cylinder, 21 ... Elastic member, 54 ... Stud bolt, 57 ... Body flange.

Claims (1)

(57) [Claims] 1. A polishing apparatus comprising: a polishing unit for polishing a sheet surface of a flange of a reactor pressure vessel body fuselage; and a suction mechanism for suctioning dust and the like generated by the polishing unit. Is mounted on a reciprocating slider portion capable of grasping and fixing the body flange and releasable from the fixing state with respect to the body flange, and the reciprocating slider portion includes a plurality of reciprocating sliders. An apparatus for polishing a seat surface of a body flange, wherein the reciprocating slider portion is moved on the seat surface by alternately changing a position.