JP2952045B2 - Bellows cleaning 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 bellows cleaning apparatus, and performs a cleaning operation when a bellows groove faces a narrow portion.

[0002]

2. Description of the Related Art In a pipe used in a nuclear power generation facility or in a connection point of various pipes such as a thermal power plant or a chemical plant, a large pipe in a length direction of the pipe is absorbed so as to absorb a large thermal displacement of the pipe. When it is necessary to allow the amount of expansion and contraction, a molded bellows or a welded bellows is used in the joint portion of the pipe.

FIGS. 6 and 7 show an example of a mounting structure of a bellows disposed in a vent pipe in a suppression chamber of a boiling water reactor.

[0004] The tip of a vent pipe B attached to the outside of the containment vessel A penetrates the suppression chamber C, and inside the pool water of the suppression chamber C via a vent header D and a downcomer E. Around the vent pipe B, a vent nozzle G surrounding the vent pipe B with an annular gap F therebetween is attached to the wall of the suppression chamber C. The annular gap F between the vent pipe B and the vent nozzle G is The bellows H is communicated with the inside of the suppression chamber C, and is isolated from the outside air by disposing the bellows H on the opposite side.

As shown in FIG. 7, the bellows H is mounted on the vent pipe B via an end plate I and a mounting sleeve J, with an intermediate sleeve K and a mounting flange L interposed therebetween. A guard pipe M is provided for protection.

On the other hand, the bellows H is formed with a bellows groove X serving as a concave portion based on the provision of corrugated irregularities on the inner surface, and dust and the like are deposited on a portion below the bellows groove X. It has an easy structure. Therefore, factors such as the accumulation of dust during the construction of the reactor, the diffusion of radioactive materials after the start of operation of the reactor, and the condensation of water vapor generated by the pool water in the suppression chamber are superimposed. It is conceivable that they adhere to the groove X.

For this reason, in the bellows H used for nuclear power generation facilities, if the amount of dust adhering to the bellows groove X is large, when a worker enters the containment vessel or the suppression chamber during a periodic inspection or the like. In addition, the radiation exposure dose increases, and the workability during periodic inspections and the like deteriorates.
It is necessary to perform a cleaning operation for removing dust and the like prior to various operations inside the device.

[0008]

The work for cleaning the inner surface of the bellows H is extremely impaired because the annular gap F between the vent pipe B and the bellows H is a narrow portion. In the bellows H shown in FIGS. 6 and 7, for example, when the outer diameter of the vent pipe B is 1464 mm to 2075 mm and the inner diameter of the vent nozzle G is 1564 mm to 2175 mm, the gap between the vent pipe B and the vent nozzle G is about 50 mm. And
Further, the depth dimension from the opening of the vent nozzle G to the end plate I is, for example, about 1550 mm in a short part and about 2350 mm in a long part.

For this reason, inside the suppression chamber C, for example, a scaffolding device (scaffolding device) for a suppression chamber of a nuclear reactor proposed in Japanese Patent Application Laid-Open No. 61-265168.
Even if N is installed and a working scaffold is secured,
It is difficult to manually clean the bellows groove X of the bellows H, which is the narrowed portion, by hand. Further, a mechanical device for cleaning the inner surface of the bellows groove X located in the annular gap F has not been developed yet.

The present invention is to effectively solve such a problem. That is, when the bellows groove faces the narrow portion, the cleaning operation is performed by remote control.

[0011]

As a means for solving the above-mentioned problems, a bellows cleaning device according to the present invention comprises a swiveling guide rail and an uneven surface provided on the outer peripheral surface of a vent pipe so as to be parallel to each other along the circumferential direction. A ring, a support frame attached to the swivel guide rail and extending in the axial direction of the vent pipe, a movable frame supported by the support frame so as to be movable in its longitudinal direction, and a bellows mounted on the tip of the movable frame A working unit for cleaning the groove, a turning drive unit mounted on the support frame and engaging with the concave and convex ring to turn the support frame, and a moving frame disposed between the support frame and the moving frame, and Reciprocating drive means for moving in the direction , wherein the working portion has a bellows groove.
Rotation that is inserted to be able to swing inside and rotated
A cleaning brush, and a rotary cleaning brush connected to the rotary cleaning brush.
A brush rotation model that rotates the brush around its center axis.
And the rotating cleaning brush connected to the rotating cleaning brush.
And a swinging motor that swings around the base end of the motor .

[0012]

The swivel guide rail and the concavo-convex ring are arranged on the outer peripheral surface of the vent pipe, and the support frame is inserted into the narrow portion facing the bellows groove. By operating the turning drive means, the support frame is moved in the circumferential direction of the vent pipe to set the turning position, and by operating the reciprocating drive means, the moving frame is moved in the longitudinal direction of the support frame to set the working position, The operation of the working unit mounted on the moving frame performs the cleaning work of the bellows groove. In this case, the swing of the working unit
The rotary cleaning brush around its base end by the motor
And insert the rotating cleaning brush into the bellows groove.
In both cases, the cleaning brush is rotated by the brush rotation motor.
While rotating it around its central axis,
The rotating cleaning brush is swung by the
Can clean the inside of the bellows groove extensively.
You.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the bellows cleaning apparatus according to the present invention will be described below with reference to FIGS.

1 to 5, reference numeral 1 denotes a turning guide rail, 2 denotes an uneven ring, 3 denotes a support frame, 4 denotes a moving frame, 5 denotes a working unit, 6 denotes a turning drive unit, and 7 denotes a reciprocating drive unit. .

The swivel guide rail 1 is brought into close contact with the outer peripheral surface of the vent pipe B at the portion where the vent pipe B is exposed from the vent nozzle G shown in FIG. They are arranged along the circumferential direction, and as shown in FIG.

The concavo-convex ring 2 is, for example, a chain having a regular concavo-convex surface. The pair of concavo-convex rings 2 are arranged in parallel with each other near the turning guide rail 1 and in close contact with the outer peripheral surface of the vent pipe B.

As shown in FIG. 1, the support frame 3 is made of aluminum material or the like to reduce its weight. As shown in FIG. 1, a turning frame member 31 within the width of the pair of turning guide rails 1 and the turning frame member 31 are provided. A rectangular insertion frame member 32 fixed to 31 and extending in the axial direction of the vent pipe B orthogonal to the swing guide rail 1 and the concavo-convex ring 2, and connected to the swing frame material 31 to prevent falling off from the vent pipe B. Vent pipe B
And a plurality of turning guide rollers disposed on the turning frame member 31 and rolling along the turning guide rail 1.
And a plurality of reciprocating guide rollers 35 arranged on both inner sides of the insertion frame member 32 and spaced apart in the axial direction of the vent pipe B.
And

The moving frame 4 has a rectilinear guide rail 41 supported movably in the axial direction of the vent pipe B over a plurality of reciprocating guide rollers 35 in the support frame 3.

The working part 5 includes a bellows groove cleaning means 51 mounted on the distal end of the moving frame 4 and a vent pipe surface cleaning means.
52 and inspection means 53.

As shown in FIG. 4, the turning drive means 6 includes a turning motor 61 such as a DC motor mounted on the turning frame member 31, and a turning force transmission system for transmitting the turning force of the turning motor 61. 62, an engaging wheel 63 such as a sprocket that is connected to the turning force transmission system 62 and engages with the uneven portion of the uneven ring 2;
A turning encoder 64 for detecting a turning amount by rotation of the turning force transmission system 62 is provided.

As shown in FIGS. 4 and 5, the reciprocating drive means 7 includes a telescopic drive motor 71 such as a DC motor mounted on the base of the insertion frame member 32 of the support frame 3, and a telescopic drive motor 71. The expansion / contraction drive belt 72 which transmits the rotational force of the movable frame 4 and is connected to the base of the moving frame 4 or the like;
A retractable drive pulley 73 which is wound around 72 and rotatably attached to an appropriate position such as an intermediate portion of the support frame 3 is provided.

As shown in FIGS. 4 and 5, the bellows groove cleaning means 51 in the working unit 5 includes a brush rotating motor 5a mounted on the base of the moving frame 4 and the like, and a brush rotating motor 5a. A torque transmission system 5b for transmitting the torque of
A rotation direction conversion unit 5c which is connected to the rotation force transmission system 5b, converts the rotation direction by 90 degrees, and is rotatably attached to the end of the moving frame 4; A rotary cleaning brush 5d which is connected to the portion 5c and is inserted into the bellows groove X and rotated, a oscillating motor 5e mounted on the base of the moving frame 4, and the like, and a rotational force of the oscillating motor 5e. Power transmission system 5f for transmitting the rotation, and a connecting means 5g such as a gear group for connecting the tip of the vibration power transmission system 5f and the rotation direction conversion unit 5c to rock the rotary cleaning brush 5d. It is assumed.

As shown in FIG. 5, the vent pipe surface cleaning means 52 includes a rotational force transmitting system in the bellows groove cleaning means 51.
5b, which is a combination of a pulley and a belt connected in the middle of 5b and to which the rotational force is supplied, and a vent pipe B which is connected to the rotational force branching system 5h to be rotated and rotated.
Brush 5i for cleaning the surface of the vent pipe to be brought into contact with the surface of the pipe
And a support bracket 5j for rotatably mounting the vent pipe surface cleaning brush 5i to a side portion or the like of the moving frame 4.

The rotary cleaning brush 5d and the vent pipe surface cleaning brush 5i are made of, for example, fine stainless steel bristles having a softness that does not damage the bellows H and the vent pipe B.

The inspection means 53 is mounted at an appropriate position such as the tip of the moving frame 4 and operates the bellows groove cleaning means 51 and the vent pipe surface cleaning means 52 and foreign matter in the bellows groove X near the tip of the moving frame 4. It has a TV camera and an illuminating means for visualizing the accumulation state of (dust and the like).

The inspection means 53 is connected to a monitoring means which is separated from the narrow portion by a signal transmission cable or the like, and the monitoring means is constituted by a TV monitor, a TV recorder, a recording device and the like.

The bellows cleaning apparatus having the above-described structure is used for cleaning the bellows groove X and cleaning the surface of the vent pipe by operating the working unit 5 at a desired cleaning position as shown in FIGS. It is assembled in an annular gap F between a certain vent pipe B and a vent nozzle G.

The turning guide rail 1 and the concavo-convex ring 2 are integrally formed on the outer peripheral surface by an appropriate means such as connection with a pin joint portion, and are disposed integrally with the outer peripheral surface of the vent pipe B. .

After the swivel guide rail 1 and the concavo-convex ring 2 are attached to the outer peripheral surface of the vent pipe B, the swivel frame member 31 of the support frame 3 is inserted into the upper part of the annular gap F, and the upper surface of the vent pipe B To support the load.

The position of the vent pipe B in the axial direction is set by engaging a plurality of turning guide rollers 34 with the turning guide rail 1 for the portion of the turning frame member 31. By this position setting, a part of the revolving frame member 31 of the support frame 3 is in a state capable of revolving movement.

With respect to the portion of the turning frame member 31, the engaging wheel
The turning frame 31 can be driven to rotate by engaging the 63 with the concave and convex portions of the concave and convex ring 2.

As shown in FIG. 1, a plurality of connecting members 33 are connected to both ends of the revolving frame member 31 so that the vent pipe B
To prevent falling off.

On the turning frame member 31 supported by the turning guide rail 1, the insertion frame member 32 is inserted into the annular gap F.
It is mounted in a partially inserted state so that its longitudinal direction matches the axial direction of the vent pipe B, and is fixed to the revolving frame member 31 by bolting or the like.

The moving frame 4 is placed on the insertion frame 32.
And the working unit 5, and the linear guide rail 41 of the moving frame 4.
Is engaged with and supported by the reciprocating guide rollers 35 to obtain the axial movement of the vent pipe B.

At the time of mounting the moving frame 4 and the working unit 5 on the support frame 3, the turning position is adjusted so that the center of gravity of the support frame 3 is located directly above the vent pipe B, thereby mounting. The assembling operation can be performed smoothly while the weight of the part to be supported is supported by the vent pipe B.

As shown in FIGS. 2 and 3, the support frame 3, the moving frame 4, and the like are thin as a whole, and when the thickness of the annular gap F is, for example, 50 mm, the inside thereof is free. The thickness is set to, for example, about 30 mm, which can be moved. In this case, the working unit 5 and the like are also set to be within the thickness range.

Hereinafter, the operation of cleaning the bellows groove X of the bellows H and the operation of cleaning the surface of the vent pipe B will be described.

The operation of the turning drive means 6 causes the support frame 3
Is moved in the circumferential direction of the vent pipe B to set the turning position, and the reciprocating drive means 7 activates the moving frame 4.
Is moved in the longitudinal direction of the support frame 3, the working unit 5 is extended to a desired working position, and the axial position of the vent pipe B is set.

After the working unit 5 has been sent to the vicinity of the desired position, the inspection means 53 is operated to visualize the situation near the tip of the moving frame 4 and is monitored by the TV monitor of the above-mentioned monitoring means.

In the case where foreign matter is found to accumulate in the bellows groove X, or when foreign matter is found adhering or accumulating on the surface of the vent pipe B, a cleaning range is set. The cleaning operation of the part is started by the simultaneous operation with the surface cleaning means 52 or the separate operation.

When the bellows groove X is to be cleaned, the rotation direction changing unit 5c is operated by the operation of the swinging motor 5e.
Is rotated to insert the rotary cleaning brush 5d into the bellows groove X to be cleaned, and the rotary cleaning brush 5d is rotated by the operation of the brush rotation motor 5a to remove accumulated foreign matter.

In this case, when the rotary cleaning brush 5d is swung by the operation of the oscillating motor 5e while rotating the rotary cleaning brush 5d in the bellows groove X, the inside of the bellows groove X is widened. When the support frame 3 is turned by the operation of the turning motor 61, the rotating cleaning brush 5d is moved in the circumferential direction along the length direction of the bellows groove X to change the cleaning position. be able to.

On the other hand, the cleaning of the surface of the vent pipe B is performed simultaneously or separately with the cleaning of the bellows groove X as described above. However, in the example shown in FIGS. Depending on the operation, the vent pipe surface cleaning means 52
Is in an operating state in which it is constantly rotated.

Therefore, when the rotary cleaning brush 5d is rotated in the bellows groove X, the cleaning state is set at the same time. When the rotary cleaning brush 5d is removed from the bellows groove X, the cleaning state is different. Becomes

For this reason, with the rotary cleaning brush 5d removed from the bellows groove X, the brush rotating motor 5a is moved while changing the position of the working unit 5 in the circumferential direction and the reciprocating direction.
By rotating the vent pipe surface cleaning brush 5i based on the operation described above, an arbitrary position on the surface of the vent pipe B can be separately cleaned.

When the cleaning position of the bellows groove X is changed in the axial direction of the vent pipe B, the expansion / contraction drive motor 71
Is operated to move the moving frame 4 by one pitch of the bellows groove X.

After the removal of foreign matter from the inner surface of the bellows groove X and the surface of the vent pipe B, the inspection means 53 is operated again to
The status of the bellows groove X and the vent pipe B is visualized and confirmed.

[0048]

According to the bellows cleaning apparatus of the present invention, the swivel guide rail and the uneven ring are arranged on the outer peripheral surface of the vent pipe, the support frame is mounted on the swivel guide rail so as to be able to run, and the working unit is mounted on the support frame. The movable frame having the front end mounted thereon is movably supported, and the bellows groove is cleaned by the operation of the working unit. Therefore, the following effects are obtained. (1) Attach the swivel guide rail, etc., to a location where working conditions are good, such as the entrance of the narrow part, and send the tip of the moving frame to the narrow part to ensure that the target part is cleaned properly. Can be. (2) By feeding the moving frame into the narrowed portion, the working unit is set at the cleaning work position, and labor can be reduced. (3) By mounting a drive source on the support frame, the moving frame, and the working section, remote control becomes possible, and the bellows can be cleaned at a position separated from the narrow portion. The working part is swingably inserted into the bellows groove.
A rotating cleaning brush which is rotated while rotating
Around the center axis of the rotary cleaning brush connected to the cleaning brush.
Motor for rotating the brush and a rotating cleaning brush
And swing the rotating cleaning brush around its base end.
Cleaning motor.
Occasionally, the cleaning brush is rotated by the work unit's swing motor.
Rock the cleaning brush around its base end,
Inserted into the closet groove and the brush rotation motor
Do not rotate the rotating cleaning brush around its center axis.
Meanwhile, the rotation cleaning brush is swung by the swinging motor.
Movement to clean the inside of the bellows groove extensively.
Can be swept away.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of a main part of a bellows cleaning device according to the present invention.

FIG. 2 is a bottom view showing one embodiment of a main part of the bellows cleaning device according to the present invention.

FIG. 3 is a right side view showing one embodiment of a main part of the bellows cleaning device according to the present invention.

FIG. 4 is an enlarged view of a base portion of the bellows cleaning device of FIG. 1;

FIG. 5 is an enlarged view of the vicinity of a working section of the bellows cleaning device of FIG. 1;

FIG. 6 is a partially sectional front view showing an example of a mounting structure of a bellows arranged in a suppression chamber of a boiling water reactor.

FIG. 7 is an enlarged view of a portion indicated by a chain line G in FIG. 6;

[Explanation of symbols]

 B Bent pipe F Annular gap G Vent nozzle H Bellows X Bellows groove 1 Swing guide rail 2 Concavo-convex ring 3 Support frame 4 Moving frame 5 Working unit 6 Swing drive means 7 Reciprocating drive means 31 Swivel frame material 32 Insertion frame material 33 Connecting material 34 Revolving guide roller 35 Reciprocating guide roller 41 Straight guide rail 51 Bellows groove cleaning means 52 Vent pipe surface cleaning means 53 Inspection means 61 Rotating motor 62 Rotating force transmission system 63 Engagement wheel 64 Rotating encoder 71 Telescopic drive motor 72 Telescopic drive belt 73 Telescopic drive pulley 5a Brush rotation motor 5b Rotary force transmission system 5c Rotation direction converter 5d Rotary cleaning brush 5e Swinging motor 5f Swing power transmission system 5g Connection means 5h Rotating force branching system 5i Vent pipe surface Cleaning brush 5j support bracket

Continuing from the front page (72) Inventor Kiyosuke Hozumi 1-9-4 Fukuura, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture Inside the Ishikawajima Inspection & Measurement Co., Ltd. Yokohama 2nd Office (72) Inventor Shuji Miyahara Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa No. 1 Ishikawajima-Harima Heavy Industries Co., Ltd., Yokohama No. 1 Factory (72) Inventor Toshio Uehara No. 1, Shinnakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Ishikawajima-Harima Heavy Industries Co., Ltd. 129898 (JP, U) JP-A-2-129899 (JP, U) JP-A-3-3489 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B08B 9/02 G21F 9 / 00 G21F 9/28

Claims (1)

(57) [Claims] 1. A swiveling guide rail and a concavo-convex ring arranged on the outer peripheral surface of a vent pipe so as to be parallel to each other along the circumferential direction, and are mounted on the swiveling guide rail so as to be able to travel and extend in the axial direction of the vent pipe. A support frame, a movable frame supported by the support frame so as to be movable in its longitudinal direction, a working unit mounted on the tip of the movable frame for cleaning the bellows groove, and an uneven ring mounted on the support frame. engage and pivot drive means for pivoting the support frame, ingredients and reciprocating drive means for moving the arranged are movable frame in the longitudinal direction of the support frame between the support frame and the moving frame
The working part is swingably inserted into the bellows groove.
Rotary cleaning brush that is rotated together with the rotary cleaning brush
The rotating cleaning brush connected to the brush and around its central axis
Brush rotation motor and rotating cleaning brush
Swing the connected rotating cleaning brush around its base end
A bellows cleaning device comprising a head swing motor .