JPH08271694A - Through hole cleaning device - Google Patents

Abstract

PURPOSE: To clean the inner surface of a multitude of bolt through holes efficiently and in a short time by rotating brush with a motor. CONSTITUTION: On a rotary table 9 rotatable in the circumferential direction of a pressure vessel head, an elevation stage 11 capable of elevating is provided so that the rotary table 9, when positioned coaxially with the pressure vessel head, comes to the position above a head flange part 2a of edge part of the pressure vessel head. To the elevation stage 11, a motor 29 having a driving shaft 29a extending below is provided so that the driving shaft 29a faces to each of a plurality of bolt penetration holes 2b formed on the head flange part 2a. The upper end of a rotary shaft 30 having a brush 31 with a diameter corresponding to the bolt through holes 2b at its lower end is connected to the drive shaft 29a of the motor 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a through hole cleaning device.

[0002]

2. Description of the Related Art As shown in FIG.
A hollow-structured pressure vessel body 1 including a tubular body portion 1a and a lower mirror portion connected to the lower portion thereof, and an upper end portion of the pressure vessel body 1 so as to close the internal space of the pressure vessel body 1 to the outside. The pressure vessel head 2 is mounted on the pressure vessel head 2.

The main body flange portion 1b formed on the peripheral edge of the upper end of the body portion 1a has a large number of bolt screw holes 1c extending downward from the upper surface of the main body flange portion 1b. The stud bolts 3 are formed at equal intervals in the direction, and the lower end male threads 3a of the vertically extending stud bolts 3 are screwed into the bolt screw holes 1c.

On the other hand, the stud bolt 3 is inserted into the head flange portion 2a formed on the lower end peripheral portion of the pressure vessel head 2 so as to correspond to the bolt screwing hole 1c of the main body flange portion 1b described above. A possible bolt through hole 2b is bored, and the internal space of the pressure vessel body 1 is closed to the outside by the pressure vessel head 2 (the pressure vessel head 2 is mounted on the upper end of the pressure vessel body 1). (In a state in which the stud bolts 3 are placed), the vertical intermediate portions 3b of the stud bolts 3 are fitted into the bolt through holes 2b, and the upper male threads 3c of the stud bolts 3 are attached to the head flange portion 2a.
It is designed to project above.

A washer 4 is fitted to a male screw 3c on the upper end side of the stud bolt 3 and a nut 5 is screwed therein. By tightening the nut 5 downwardly of the stud bolt 3, The pressure vessel head 2 is fixed to the pressure vessel body 1.

At the time of periodic inspection of the nuclear reactor, after the nut 5 is unscrewed from the male screw 3c on the upper end side of the stud bolt 3, the pressure vessel head 2 is removed from the pressure vessel body 1 by a lifting means such as a crane. After being cut off, the structure including the pressure vessel main body 1 and the like and the equipment installed in the pressure vessel main body 1 are inspected.

Since the above-mentioned structures and equipment are carefully inspected, during the periodic inspection of the nuclear reactor, the pressure vessel head 2 is cut off from the pressure vessel body 1 for a long period of time, and various inspections are performed. By the time it is completed, rust may occur on the inner peripheral surface of the bolt through hole 2b of the pressure vessel head 2, or foreign matter such as dust may adhere.

For this reason, conventionally, when the internal space of the pressure vessel main body 1 is closed by the pressure vessel head 2 after completion of various inspections in the regular inspection, the inner peripheral surface of the bolt through hole 2b is manually cleaned. This is done so that foreign matter such as rust and dust does not enter the inside of the pressure vessel body 1 when the pressure vessel body 1 is mounted on the pressure vessel body 1.

[0009]

However, the output 110
In a nuclear reactor applied to a power generation facility of about 10,000 kW, the pressure vessel head 2 is provided with 90 to 100 bolt through holes 2b, and the inner diameter of the bolt through holes 2b is 100.
Since it is about several tens of mm, it takes a lot of time to complete the cleaning work of each bolt through hole 2b.

The present invention has been made in view of the above situation, and an object thereof is to provide a through hole cleaning device capable of efficiently cleaning the bolt through holes of the pressure vessel head.

[0011]

In order to achieve the above object, in the through hole cleaning apparatus of the present invention, a swivel table which can be positioned coaxially with the pressure vessel head and can be rotated in the circumferential direction of the pressure vessel head. And a lift table supported up and down on the swivel table so that it can be positioned above the head flange portion at the peripheral edge of the pressure container head when the swivel table is positioned coaxially with the pressure container head, and A drive unit having an extending drive shaft attached to the elevator so that the drive shaft can face each of a plurality of bolt through holes formed in the head flange portion; and an upper end portion of the drive unit. A rotary shaft which can be connected to the drive shaft and has a brush having an outer diameter corresponding to the bolt through hole at the lower end.

[0012]

In the through-hole cleaning device of the present invention, the rotational force of the driving device is transmitted to the brush through the rotary shaft connected to the driving shaft of the driving device, and the lifting table is lowered with respect to the swivel table to apply pressure. A rotating brush is inserted into the bolt through hole of the container head to remove foreign matter such as rust formed on the inner peripheral surface of the bolt through hole and dust attached to the inner peripheral surface of the bolt through hole.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the through hole cleaning device of the present invention. In the drawings, the parts designated by the same reference numerals as those in FIG. 4 represent the same parts.

This embodiment is based on an existing pressure vessel head attachment / detachment device 6 whose overall structure is shown in FIG. 3, and has a structure in which a through hole cleaning function is added to the pressure vessel head attachment / detachment device 6.

The pressure vessel head attachment / detachment device 6 has an attachment / detachment device body (system base) 7 connectable to a bracket 2c provided on the upper surface of the pressure vessel head 2 and the attachment / detachment device body 7 connected to the pressure vessel head 2. At this time, an annular swivel table 9 is supported by the attachment / detachment device main body 7 via a bearing 8 so that the swivel table 9 can be rotated about the pressure vessel head 2, and the swivel table 9 can be moved up and down by an elevating mechanism 10. The lifting table (common bed) 11 supported by the lifting table 1
1, a nut washer attaching / detaching mechanism 12, a tension applying mechanism (stud tensioner) 13, a stud bolt attaching / detaching mechanism 14
Is equipped.

A motor 15 having a drive gear 15a is attached to a predetermined position of the attachment / detachment device main body 7, while an inner ring-shaped internal gear 9a along the circumferential direction is provided on the inner edge of the revolving table 9 for driving the drive. It is fixed so as to mesh with the gear 15a, and when the motor 15 is operated, the revolving table 9 rotates with respect to the attachment / detachment device body 7.

The elevating mechanism 10 includes a base plate 16 provided at a predetermined position on the revolving table 9 and an elevating rod 17a attached to the base plate 16 and vertically moving up and down.
A plurality of screw jacks 17, connecting rods 18 that connect the lower ends of the lifting rods 17a to the upper surface of the lifting table 11, and rotational force transmission that is attached to the upper surface of the base plate 16 and includes a shaft or the like. It is composed of a motor 19 for driving each screw jack 17 via a mechanism 19a, and when the motor 19 is operated, the elevator 11 is moved up and down with respect to the turning table 9.

The nut washer attaching / detaching mechanism 12 can be fitted to the nut 5 and the washer 4 shown in FIG. 4 from the upper side and is supported by the elevating table 11 so as to be rotatable in the circumferential direction. And a motor 21 for rotating the fitting tool 20 with respect to the lifting table 11, and the fitting tool 20 is provided.
Has a function of gripping the nut 5 and the washer 4, and is also movable in the horizontal direction.

The nut washer attaching / detaching mechanism 12 is used for the motor 2
1 is operated, the nut 5 is loosened by the fitting tool 20 to remove the nut 5 and the washer 4 from the stud bolt 3, and the washer 4 and the nut 5 are attached to the stud bolt 3 by the fitting tool 20. The work of tightening the nut 5 is performed.

The tension applying mechanism 13 can be fitted into the stud bolt 3 shown in FIG. 4 from the upper side and is supported by the lifting table 11 so that it can be moved up and down. A plurality of vertically extending screw jacks 23 whose lower end is fixed to the upper surface, and a rotational force transmission mechanism 2 which is attached to the upper surface of the lifting table 11 and includes a shaft or the like.
4a, a motor 24 for driving each screw jack 23, an elevating beam 25 interconnecting the upper ends of the screw jacks 23, and a lower end surface of the elevating beam 25 is an upper end surface of the fitting 22. And a connecting rod 25a connected to
It has a function of gripping the stud bolt 3.

The tension applying mechanism 13 applies a tension to the stud bolt 3 by pulling the stud bolt 3 by the fitting 22 when the motor 24 is operated when the nut 5 is attached and detached. ing.

The stud bolt attaching / detaching mechanism 14 can be fitted to the stud bolt 3 shown in FIG. 4 from the upper side, and a fitting tool 26 supported by the elevating table 11 so as to be able to move up and down while rotating. The fitting tool 26 is composed of a motor 27 that raises and lowers the fitting tool 26 while rotating the fitting tool 26 with respect to the lift table 11. The fitting tool 26 has a function of gripping the stud bolt 3.

The stud bolt attachment / detachment mechanism 14 is adapted to remove the stud bolt 3 from the main body flange portion 1b and to attach the stud bolt 3 to the main body flange portion 1b.

Further, the lifting table 11 described above is provided with a through hole cleaning mechanism 28.

The through hole cleaning mechanism 28 has a drive shaft 29a extending downward in the vertical direction and a motor 29 attached to the lifting table 11, a rotary shaft 30 extending vertically, and a lower end portion of the rotary shaft 30. And a brush 31 provided on the.

A rotational force transmitting flange 29b is provided on the lower end of the drive shaft 29a of the motor, and a rotational force transmitting flange 30a is also provided on the upper end of the rotating shaft 30.
By fastening both flanges 29b and 30a to each other by bolts, the rotary shaft 30 can be rotated relative to the drive shaft 29a of the motor 29.
Can be connected.

The brush 31 has an outer diameter corresponding to the bolt through hole 2b of the head flange portion 2a.

The entire length of the rotary shaft 30 is obtained by connecting the attachment / detachment device body 7 to the pressure vessel head 2 (see FIG. 3) and connecting the rotary shaft 30 to the drive shaft 29a of the motor 29.
So that the brush 31 is located above the head flange portion 2a in the state of raising (see FIG. 2), and that the brush 31 is inserted into the bolt through hole 2b in the state of lowering the elevating table 11. (See Figure 1)
The entire length of the drive shaft 29a is set so that it does not interfere with the head flange portion 2a regardless of the position of the lift table 11 when the rotary shaft 30 is not connected to the drive shaft 29a.

The operation of this embodiment will be described below.

When carrying out a periodic inspection of the reactor, the attaching / detaching device body 7 of the pressure vessel head attaching / detaching device 6 is engaged with a lifting means such as a crane to suspend the pressure vessel head attaching / detaching device 6, 7 is supported on the bracket 2c of the pressure vessel head 2 with a bolt or the like (see FIG. 3).

At this time, the rotary shaft 30 is not connected to the drive shaft 29a of the motor 29 constituting the through hole cleaning mechanism 28.

Then, the elevating mechanism 10 is operated to lower the elevating table 11 from the turning table 9, and then the tension applying mechanism 13 is operated to apply tension to the stud bolt 3 shown in FIG. The mechanism 12 is operated to remove the nut 5 and the washer 4 from the stud bolt 3, and the nut 5 and the washer 4 are supported on a nut mounting table (not shown) temporarily provided around the pressure vessel head 2.

After removing the nut 5 and the washer 4,
The stud bolt attaching / detaching mechanism 14 is operated to remove the stud bolt 3 from the main body flange portion 1b shown in FIG.

When performing the above-mentioned work of removing the nut 5 and the washer 4 and the work of removing the stud bolt 3, the certain nut 5 and the washer 4 or the certain stud bolt 3 are used.
After the removal, the lifting mechanism 10 is operated and the lifting table 11 is raised toward the turning table 9, and the turning table 9 is rotated with respect to the attachment / detachment device body 7 by the motor 15. The nut washer attaching / detaching mechanism 12,
The tension applying mechanism 13 and the stud bolt attaching / detaching mechanism 14 are made to face the next nut 5 and washer 4 or a certain stud bolt 3, and then the nut 5 is made by the procedure described above.
And washer 4 removal work, or stud bolt 3
Do the removal work of.

When all the nuts 5, washers 4 and stud bolts 3 for fixing the pressure vessel head 2 to the pressure vessel body 1 have been removed, the pressure vessel head attaching / detaching device 6 and the pressure vessel head attaching / detaching device 6 are pressed by a lifting means such as a crane. The container head 2 is lifted up and the pressure container head 2 is attached to the pressure container body 1
Then, the pressure vessel head 2 and the pressure vessel head attaching / detaching device 6 are transported to a predetermined storage location and stored.

When various operations in the regular inspection are completed, before the pressure vessel head 2 closes the internal space of the pressure vessel body 1, the rust formed on the inner peripheral surface of the bolt through hole 2b and the bolt through hole are formed. Cleaning is performed to remove foreign matter such as dust adhering to the inner peripheral surface of 2b.

At this time, the rotational force transmitting flange 29b at the lower end of the drive shaft 29a and the rotational force transmitting flange 30a at the upper end of the rotating shaft 30 are bolted to each other so that the motor 29 constituting the through-hole cleaning mechanism 28 is secured. The brush 31 is connected via the rotary shaft 30.

Next, the motor 29 is operated to operate the brush 3
1 is rotated and the lifting mechanism 10 is operated to lower the lifting platform 11 with respect to the turning table 9.

As a result, the rotating brush 31 is inserted into the bolt through hole 2b of the head flange portion 2a, and the rust generated on the inner peripheral surface of the bolt through hole 2b and the bolt through hole 2b.
Foreign matter such as dust adhering to the inner peripheral surface of b is cleaned and removed by the brush 31.

When the inner peripheral surface of the bolt through hole 2b is cleaned, the inner peripheral surface of a certain bolt through hole 2b is cleaned, and then the elevating mechanism 10 is operated to rotate the elevating table 11. With the elevator 11 raised toward the table 9,
That is, in the state where the brush 31 is pulled out to the upper outside of the bolt through hole 2b, the turning table 9 is driven by the motor 15.
Is rotated with respect to the attachment / detachment device main body 7 so that the brush 31 faces the next bolt through hole 2b, and the bolt through hole 2b is cleaned by the procedure described above.

All bolt through holes 2 of the pressure vessel head 2
When the cleaning work for b is completed, the rotary shaft 30 is removed from the drive shaft 29a of the motor 29 by releasing the bolt fastening of both rotational force transmission flanges 29b and 30a, and the pressure vessel is lifted by a crane or the like. The pressure vessel head 2 is lifted together with the head attaching / detaching device 6, and the pressure vessel head 2 is placed on the pressure vessel body 1.

Further, the work of attaching / detaching the stud bolt 3 to / from the main body flange portion 1b shown in FIG. 4 by the stud bolt attaching / detaching mechanism 14 and the nut washer attaching / detaching mechanism 12 while applying tension to the stud bolt 3 by the tension applying mechanism 13. The washer 4 and the nut 5 are attached to 3 and the nut 5 is tightened to fix the pressure vessel head 2 to the pressure vessel body 1.

Thus, in this embodiment, the motor 2
Since the brush 31 that rotates by 9 cleans the inner peripheral surface of each bolt through hole 2b, the inner peripheral surface of a large number of bolt through holes 2b can be reliably cleaned in a short time.

Further, in this embodiment, since the through hole cleaning mechanism 28 for cleaning the bolt through hole 2b is provided on the elevating table 11 of the pressure vessel head attaching / detaching device 6, the pressure vessel body 1 to the pressure vessel head are removed. It is possible to effectively use the pressure vessel head attaching / detaching device 6 which is in an idle state until the pressure vessel head 2 is mounted on the pressure vessel body 1 again after the pressure vessel head 2 is cut off.

The through-hole cleaning device of the present invention is not limited to the above-described embodiment, but can be realized as an independent structure without including the function of the pressure vessel head attaching / detaching device, and other aspects of the present invention. Of course, various changes can be made without departing from the range.

[0047]

As described above, according to the through-hole cleaning device of the present invention, the brush is connected to the drive shaft of the drive device to rotate the brush, and the elevator is lowered by lowering it relative to the swivel table. Insert the brush into the bolt through hole of the pressure vessel head to remove foreign matter such as rust generated on the inner peripheral surface of the bolt through hole and dust attached to the inner peripheral surface of the bolt through hole. The excellent effect that the inner peripheral surface can be reliably cleaned in a short time can be achieved.

[Brief description of drawings]

FIG. 1 is a front view showing a state in which a lift is lowered in an embodiment of a through-hole cleaning device of the present invention.

FIG. 2 is a front view showing a state in which a lift is raised in an embodiment of a through-hole cleaning device of the present invention.

FIG. 3 is a partially cut front view showing an example of a pressure vessel head attaching / detaching device.

FIG. 4 is a partial front view showing a fastening structure between a pressure vessel body and a pressure vessel head of a nuclear reactor.

[Explanation of symbols]

 2 Pressure Vessel Head 2a Head Flange 2b Bolt Through Hole 9 Turning Table 11 Lifting Table 29 Motor (Drive Device) 29a Drive Shaft 30 Rotation Shaft 31 Brush

Claims (1)

[Claims] 1. A swivel table which can be positioned coaxially with the pressure vessel head and can rotate in the circumferential direction of the pressure vessel head, and a swivel table of the pressure vessel head when the swivel table is positioned coaxially with the pressure vessel head. An elevation table supported by a revolving table so as to be able to move up and down so as to be located above the head flange portion at the peripheral edge portion, and a plurality of bolt penetrations having a drive shaft extending downward and having the drive shaft formed on the head flange portion. A driving device attached to the lifting table so as to face each of the holes, and an outer diameter corresponding to the bolt through hole at an upper end of the driving device and a driving shaft of the driving device. And a rotating shaft having a brush.