JPH02221900A - Seat surface grinding device for barrel flange - Google Patents

Abstract

PURPOSE:To mechanize and automate operation and to improve the efficiency of the cleaning operation for the flange seat surface of a nuclear reactor pressure container by providing a reciprocal slider part which can grip and fix the barrel flange and release the grip fixation state. CONSTITUTION:When one-side sliders 1a and 1b grip and fix the barrel flange, the other-side sliders 2a and 2b are released from gripping and fixing the barrel flange and in this state, the relative positions of both the reciprocal sliders are changed through an air cylinder 5A, etc. This operation is performed alternately for the sliders and a grinding unit 5B and a sucking mechanism mounted on the reciprocal slider part move along a seat surface to remove sticking matter such as silver plating on the seat surface. When the reciprocal slider part moves on the seat surface, the barrel flange is released from being gripped and fixed and the slider part can move without any hindrance even when many stud bolts are stood, not to mention a case wherein there is no stud bolt 54.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to sheet face cutting of a fuselage flange of 9 gM, and in particular to removing dust such as silver plating of an O-ring attached to the face of a nuclear reactor pressure vessel fuselage flange. Relating to a device for

(Prior art) As shown in FIGS. 5, 6, and 7, the reactor pressure vessel is constructed by connecting the upper 151 and the body 52 with an O ring (53 in FIG. 8).
) with a stand bolt 54 and a nut 55 to seal the entire pressure vessel.

The stud bolt 54 is connected by a threaded portion 58 of the body flange 57 and a threaded portion 5B of the stud bolt 54 meshing together. Further, the stand bolt 54 passes through a through hole 60 formed in the upper lid flange 59, and the stud bolt 54 passes through a through hole 60 formed in the upper lid flange 59.
A threaded portion 61 at the other end of 4 protrudes above the upper lid flange 59. A washer 56 and a nut 55 are attached to this threaded portion 61.
Attach the O-ring (5 in Figure 8) and tighten it by force.
3) Connect the top cover 51 and body 52 with stud bolts 54 through
is sealed.

FIG. 8 is a detailed enlarged view of part B in FIG. 7, showing the sealed state of the reactor pressure vessel by the O-ring 53 on the seat surface.
The O-ring attachment formed in 2 is attached to the groove 63 and pressed against the seat surface 62 of the fuselage flange 57. Thereafter, by tightening the fuselage flange 57 and the upper cover flange 59 with the stud bolts 54, the O-ring 53 is crushed into an elliptical shape, and the reaction force causes the seat surface to 62°62
is sealed. Further, the outer surface of the O-ring 53 is plated with silver, and the silver plating fills the gaps between the O-ring 53 and the seat surface 62 and the surface of the groove 63 where the O-ring is attached, thereby improving sealing performance.

By the way, the upper 151 of the reactor pressure vessel is opened and closed once a year for periodic inspection, and before the upper 151 is closed, the O-ring 53 is replaced with a new one. At this time,
It is necessary to remove dust such as silver plating adhering to the seat surface 62 of the fuselage flange 57, and to clean and polish the seat surface 62.

Furthermore, when attaching the O-ring to the upper lid flange 59, the groove 63 also needs to be cleaned and polished in the same manner.

The seat surface 62 of the fuselage flange 57 is polished and cleaned while the reactor pressure vessel located in the reactor building below the operating room floor is filled with water. However, since the seat surface 62 is located inside the stud bolts 54 that stand on the flange 57, polishing and cleaning of the seat surface 62 must be done manually between the stud bolts 54 and 54. Therefore, in order to minimize exposure to radiation from inside the reactor pressure vessel, workers should sit low, insert their hands through the gaps between the stud bolts, and directly use a grindstone to clean and polish. It is carried out.

Examples of devices related to this type of device include those described in Japanese Utility Model Application No. 60-134200, Japanese Utility Model Application No. 61-97786, and the like.

[Problem to be solved by the invention]

In the case of cleaning and polishing the seat surface 62 of the fuselage flange 57, the above-mentioned conventional technology can
It forces workers into unreasonable postures and is highly contaminated 1
Due to the large size of the page area, the workers are wearing protective clothing and dust masks, and the work requires them to put their hands through the narrow gaps between the stand bolts 54 and 54, resulting in very poor work efficiency and the large amount of dust that is generated during cleaning. There is also the problem of internal radiation exposure for workers due to scattering.

On the other hand, in Japanese Utility Model Application Publication No. 60-134200, a scraper for peeling off the deposits is placed on a traveling cart that is movably placed on the flange surface, and a scraper is disposed near the scraper to remove the deposits that have been peeled off. A flange cleaning device is shown that includes a vacuum cleaner that sucks up dirt, a rotating brush that is placed after the scraper to polish the flange surface, and a extraction means that is placed after the rotating brush to remove deposits from the flange. has been done.

However, in the above-mentioned device, sufficient consideration is not given to the condition that the stand bolts 54 are lined up on the outer periphery of the flange seat surface 62 of the fuselage flange 52 of the reactor pressure vessel. Although it is possible to clean and polish the seat surface 62 after cleaning and polishing the seat surface 62, the work of removing the stud bolt 54 and re-inserting it will result in additional radiation exposure for the worker, and the overall work will be It is not economical or efficient because it takes a long time.

On the other hand, in Utility Model Application No. 61-097786, a telescoping arm is attached to a frame attached to the upper part of the fuselage flange 52 of the reactor pressure vessel, a cleaning section is attached to one end of this telescoping arm, and the telescoping arm is attached to the seat surface. It has a structure that rotates around the center of 62.

The cleaning section includes a wire brush for cleaning the seat 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 device, consideration has been given to the stand bolts 54 that stand on the outer periphery of the seat surface 62, and the cleaning device can be set from inside the reactor pressure vessel via a pedestal. However, in order to set up the cleaning equipment, it is necessary to set up a large pedestal with the same dimensions as the reactor pressure vessel diameter during work, which not only causes additional radiation exposure for workers for setting up the pedestal, but also Since the work time is long, it is not economical and efficient.Furthermore, it is necessary to secure a space to store the large frame after the work is completed.

The purpose of the present invention is to provide a flange sheet surface polishing device that not only mechanizes and automates the work, but also improves the cleaning efficiency of the flange sheet surface where many bolts are located in nuclear reactor pressure vessels, etc., and reduces the radiation exposure of workers. It is about providing.

[Means to solve the problem]

The above purpose is to provide a reciprocating slider section having a plurality of reciprocating sliders that can grip and fix the fuselage flange and release the gripping and fixing state to the fuselage flange, and alternately change the relative positions of the plurality of reciprocating sliders. This is achieved by making the reciprocating slider part movable along the sheet surface, and mounting a polishing unit for polishing the sheet surface and a suction mechanism for suctioning dust etc. on the reciprocating slider part.

[Effect]

When one of the reciprocating sliders grips and fixes the body flange, the other reciprocating slider grips and fixes the body flange. change through. By performing such operations alternately, the polishing unit and suction mechanism mounted on a portion of the reciprocating cylinder move along the sheet surface and remove deposits such as silver plating on the sheet surface.

When the reciprocating slider section moves on the seat surface, it is released from the gripping and fixing state to the fuselage flange, and can move without any problem even if there are no stud bolts involved, or even if there are a bunch of stud bolts.

【Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is an overall plan configuration diagram showing an embodiment of the fuselage flange sheet surface polishing apparatus of the present invention.

This fuselage flange sheet surface polishing device consists of first reciprocating slider parts 1a, lb and second reciprocating slider parts 2a, 2b.
The first reciprocating slider section la and the 1J41 reciprocating slider section 1b are connected by a connecting tool 3, and the second reciprocating slider section 2a and the second reciprocating slider section 2b are connected by a connecting tool 4.

First reciprocating slider section 1b and second reciprocating slider section 2b
An air cylinder 5A is installed between the first reciprocating slider portions la and lb, which are integrally formed by the connecting tool 3 and have a fixed distance from each other, and the connecting tool 4.
The distance between the second reciprocating slider portions 2a and 2b, which are integrally constructed and have a fixed distance from each other, can be adjusted by moving one of the slider portions along the guide rail 6. In FIG. 1, the first reciprocating slider parts 1a, lb grip and fix the fuselage flange 57, and when the air cylinder 5A is actuated, the second
The reciprocating slider parts 2a and 2b move together to the right in the drawing, and the distance between a portion of both cylinders is adjusted.

Therefore, in the fuselage flange sheet surface polishing device of the present invention, the reciprocating slider portions move alternately like so-called inchworms. The polishing unit 7 is movable integrally with the first reciprocating slider section, and has a structure in which it can move by itself along the guide rail 6.

FIG. 2 is a side view of the main parts of the fuselage flange seat surface polishing apparatus of the present invention, showing the state of the side surfaces of the first reciprocating slider section 1b and the second reciprocating slider section 2a (% polishing unit) 5B. .

As shown in FIG. 2, in the second reciprocating slider section 2a (and 2b), an air cylinder 18 whose one end is pivotally connected to the straw inner rail 15 is tilted upward, while the first reciprocating slider section 1b ( and Ia), the air cylinder 18 whose one end is pivotally attached 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 body 7 through which a guide rail 6 is inserted, and the unit body 7 is equipped with a drive wheel 8 driven by a motor 9 and a rotating grindstone 10 driven by a motor 11. A dust collecting pipe 12 having an opening near the grinding wheel lO is connected.

Since the structures of the first reciprocating slider sections 1a, lb and the second reciprocating slider sections 2a, 2b are substantially the same, their structures will be explained based on FIG. 3.

The reciprocating slider section includes a guide guide 14 that moves along the seat surface of the fuselage flange 57 via a rotating roller 13.
A pair of L-shaped guide rails 15 are fixed to the guide 14.

A slider 16 is slidably installed on the pair of guide rails 15 , one end of a pair of arms 17 is pivotally attached to the slider 16 , and the longitudinal intermediate portion of the slider 16 and one end of the guide rail 15 are connected to each other. Each end of the air cylinder 18 is pivotally connected to the air cylinder 18 . The arm 17 has an arm 19 having an elastic member 21 made of rubber or the like at its tip. Both ends of an air cylinder 200 are pivotally connected between the end of the arm 17 and the pivot point of the air cylinder 18 to the arm 17. ing.

Next, the operation of the fuselage flange sheet surface polishing device constructed as shown in Fig. 8 will be explained.

When replacing fuel, loosen the stand bolt 54 and tighten the upper g151.
is opened and the seat surface 62 of the fuselage flange 57 shown in FIG.
An O-ring 63.63 coated with silver plating is attached therein, and when the upper mirror 1 is opened, the silver plating adheres to the seat surface 62 of the fuselage flange 57. The polishing device moves along the seat surface of the fuselage flange 57 as shown in FIG. 1 in order to remove the above-mentioned dirt and deposits.

In FIG. 1, the first reciprocating slider section 1a.

1b is fixed by gripping and fixing the fuselage flange 57.

In this state, when the drive shaft 8 of the polishing unit 5B is rotated by the motor 9, the unit main body 7 moves along the guide rail 6 in the direction shown by the arrow in the figure, and moves on the sheet surface. Then, the motor 11 rotates the rotating grindstone lO
Rotate to polish the sheet surface and remove deposits such as silver plating from the sheet surface. The removed deposits such as silver plating are removed by suction through the dust collecting pipe 12 by a suction device (not shown).

When performing sharpening work by moving the seat surface between the second reciprocating slider section 2a and the first reciprocating slider section 1b in FIG. Air cylinder 5A installed between
Compressed air is introduced into the second reciprocating slider portions 2a, 2.
b move together to the right in the drawing.

At this time, the second reciprocating slider section 2a (
and 2b) are in the state shown in FIG. 3, and in this state, when compressed air is introduced into the air cylinder 18 and the cylinder rond is extended, the arm 17 rotates about the fulcrum C, and the arm 17 rotates around the fulcrum C, The side surface of the arm 17 comes into contact with the claw, and the rotational movement of the arm 17 is stopped. Therefore, the arm 17 stops at an angle indicated by θ in the figure with respect to the horizontal plane. When the cylinder rond of the air cylinder 18 continues to extend, the slider 16 moves in parallel on the inner rail 15 to the right in the drawing, and the arm 17 inclines toward the stud bolt 54 side. Thereafter, when compressed air is introduced into the air cylinder 20 and the cylinder rond is extended, the arm 19 rotates around the fulcrum d and becomes the state shown in FIG. The fuselage flange 57 is gripped and fixed by pressure contact with the side surface of the fuselage flange 57.

On the other hand, in the first reciprocating slider section 1b (and la) in FIG. 2, compressed air is introduced into the respective air cylinders 18, 20 by an operation opposite to that described above, and as shown in FIG. 57 is released. In this case, the arm 17 is locked and fixed by 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 section 2a (and 2b
) is fixed, and the first reciprocating slider part lb (and la)
moves on the sheet surface. The polishing unit 5B polishes the sheet surface without falling (self-propelled) between the first reciprocating slider section 2a and the first reciprocating slider section 1b.

Thereafter, similarly, the first reciprocating slider parts 1a, lb and the second reciprocating slider parts 2a, 2b alternately grip the body flange 57, and the polishing device moves on the seat surface by the operation of the air cylinder 5A, and the polishing unit 5B The sheet surface is polished. In this series of operations, each air cylinder 5A, 18.20
Meanwhile, compressed air is introduced at a predetermined timing.

〔Effect of the invention〕

As described above, according to the present invention, even if an obstacle such as a stand bolt is present in the reactor pressure vessel cavity flange, the reciprocating slider portion moves on the seat surface without any hindrance, and in response to this movement, the polishing unit and Since the suction mechanism can move along the sheet surface and polish the sheet surface, polishing of the sheet surface of the fuselage flange can be performed automatically, improving work efficiency and reducing radiation exposure of workers.

[Brief explanation of the drawing]

Fig. 1 is an overall plan configuration diagram when the fuselage flange sheet surface polishing device of the present invention is installed on the fuselage flange surface, Fig. 2 is a side view of each main part in Fig. 1, and Fig. 3 (A) is 1st
3(B) is a side view of FIG. 3(A), FIG. 4(A) is a sectional view of FIG.
) is a side view of FIG. 4(A), FIG. 5 is a schematic sectional view of the reactor pressure vessel, FIG. 6 is an enlarged sectional view of section A in FIG. 5, and FIG.
The figure is an enlarged detailed view of FIG. 6, and FIG. 8 is an enlarged detailed view of part B of FIG. 7. la, lb...first reciprocating slider section, 2a. 2b...Second reciprocating slider section, 3...
- Connector, 4... Connector, 5A... Air cylinder, 5B... Polishing unit, 6...
...Guide rail, 7...Unit body, 8
... Drive wheel, 9 ... Motor, 10.
... Rotating grindstone, 11 ... Motor, 12.
...Dust collection pipe, 13 ...Rotating roller, 14
...Guide guide, 15...Guide rail, 16...Slider 17...Arm, 18...Air cylinder, 19...・・・
・Arm, 20...Air cylinder, 21...
...Elastic member, 54...Stand bolt,
57... Fuselage flange. Representative Patent Attorney Masaru Nishimoto - Figure 7 Figure 8

Claims (1)

[Claims] (1) A device comprising a polishing unit for polishing a sheet surface of a reactor pressure vessel body flange, and a suction mechanism for suctioning dust, etc. generated by polishing by the polishing unit, in which the polishing unit and the suction mechanism are The reciprocating slider is mounted on a reciprocating slider part that can grip and fix the fuselage flange and can release the state of gripping and fixing the fuselage flange, and the reciprocating slider part is composed of a plurality of reciprocating sliders, and the relative position between these reciprocating sliders is determined. A fuselage flange seat surface polishing device characterized in that the reciprocating slider portion is moved on the seat surface by alternating the reciprocating slider portions.