JP2543751Y2 - Bolt removal 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 bolt attaching / detaching apparatus for installing stud bolts on a body flange of a reactor pressure vessel.

[0002]

2. Description of the Related Art A large number of stud bolts for mounting and dismounting a lid on the top of a pressure vessel are arranged and planted on a body flange of a reactor pressure vessel installed in a nuclear power plant or the like. The stud bolts may be removed and inspected during periodic inspections of the reactor pressure vessel, with the stud bolts being removed by a remotely operated bolt removal device.

Further, the stud bolt has a measurement hole for measuring the elongation of the stud bolt along the axis thereof. A groove is formed.

On the other hand, the conventional bolt attaching / detaching device is shown in FIG.
As shown in FIG. 1, a pair of engaging pins 4 which are seated on the top of the stud bolt 1 and engage with the engaging grooves 3 on the inner surface of the top of the measuring hole 2 of the stud bolt 1 are provided. And a spline groove 7 which is connected to a rotating system (not shown), is fitted on the outer periphery of the rotating pawl member 6, and engages the spline 5 on the inner peripheral surface thereof. A bolt attaching / detaching device 9 was formed by the formed splice boss 8.

[0005]

By the way, in the above-mentioned bolt attaching / detaching device 9, the engaging pin 4 of the rotary pawl member 6 is not provided.
Is engaged with the engaging groove 3 of the stud bolt 1 and the rotary pawl member 6 is rotated via the spline boss 8 to remove the stud bolt 1. The bolt pitch at which the stud bolts 1 are arranged Since the circle diagram (not shown) is large, it is difficult to adjust the deviation between the rotation axis of the bolt attaching / detaching device 9 and the axis of the stud bolt 1. The eccentric load applied to the stud bolt 1 becomes large, so that the screwed stud bolt 1 cannot be rotated and unscrewed.

Therefore, conventionally, a dedicated aligning machine (not shown) is added to the bolt attaching / detaching device 9 to adjust the deviation of the axis, and the axis is adjusted. There is a problem of oversizing.

On the other hand, the bolt attaching / detaching device 9 is provided with the engaging groove 3 of the stud bolt 1 and the spline boss 8 so that the engagement of the engaging pin 4 of the rotary pawl member 6 and the engagement of the spline 5 allow some movement. Although the spline groove 7 is formed relatively large, the rotation pawl member 6 is formed in a large number of splines 5, so that even if there is a margin for engagement, the movement is restricted and the axis is automatically adjusted. There is no centering action, and the above centering machine adjusts the axis by moving the entire bolt attaching / detaching device 9, so that it is difficult to adjust the axis, and a large amount of time is required for centering. was there.

Therefore, an object of the present invention is to provide a bolt attaching / detaching apparatus capable of automatically adjusting the eccentricity with a compact configuration without having a dedicated aligning device in order to solve the above-mentioned problems. .

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a bolt attaching / detaching apparatus for implanting stud bolts on a body flange of a reactor pressure vessel. A pair of engagement grooves formed 180 degrees opposite to each other and a pair of engagement pins seated on the top of the stud bolt and engaged with the engagement grooves at the lower end. A rotating pawl member having a pair of spline protrusions protrudingly extended in the longitudinal direction of the stud bolt at a position rotated by 90 degrees with respect to the pin, and connected to a rotating system and fitted to the outer periphery of the rotating pawl member; together, and the spline projections on its inner periphery Sly
And a spline boss having a spline groove movably engaged with the spline boss.
The spline boss can be made to protrude and retract from the lower end of the spline boss .

[0010]

According to the above construction, when the stud bolt is to be attached / detached, the engagement pin of the rotary pawl member is engaged with the engagement groove of the stud bolt, and the stud holt is rotated to attach / detach the stud bolt.

The rotary pawl member is formed at a position where the pair of spline projections are rotated by 90 degrees with respect to the engaging pin, so that when the rotary pawl member is seated on the top of the stud bolt, its axis is the axis of the stud bolt. Even if it is displaced, the displacement of the shaft center can be automatically adjusted by moving the engagement groove, the engagement pin engaged with the spline groove, and the spline protrusion within the margin of engagement.

As described above, since the displacement of the axis can be adjusted by the rotating pawl member, the centering is facilitated, and it is not necessary to provide a conventional centering machine in the bolt attaching / detaching apparatus, and the entire apparatus can be made compact. It is possible to Also, times
While engaging the pawl member with the spline boss,
Because it can be moved in and out from the lower end of the
Large gap between the top of the stud bolt and the bottom of the spline boss
Regardless of the size, rotate the spline boss's rotational force well
It can be transmitted to the stud bolt side via the pawl member
You.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.

1 to 3 show an embodiment of the bolt attaching / detaching apparatus according to the present invention.

FIG. 1 shows a main part of an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a stud bolt which is implanted in a body flange 15 of a reactor pressure vessel. A measurement hole 2 for measuring the elongation of the stud bolt 1 is formed in the center along the axial direction. A pair of engagement holes is formed at the top of the measurement hole 2 so as to face the inner circumference 180 degrees. A groove 3 is formed.

On the other hand, a bolt attachment / detachment device 9 for attaching / detaching the stud bolt 1 is seated on the top of the stud bolt 1 and has a pair of engagement pins 4 at its lower end which engage with the engagement grooves 3 as shown by arrows in FIG. A rotating pawl member 11 formed opposite to the X direction and having a pair of spline protrusions 10 formed on its outer peripheral surface at a 90-degree rotation position (the Y direction in the figure) with respect to the engagement pin 4; The spline groove 1 is connected to the rotation system 17 and is fitted to the outer periphery of the rotary pawl member 11 and the spline projection 10 is engaged with the inner peripheral surface thereof.
2 is formed with the spline boss 13 formed.
As shown, these spline projections 10, 1
0 and the spline grooves 12
The bolt 1 is formed so as to extend in the longitudinal direction.
The rotating pawl member 11 engages with the spline boss 13
From the lower end of the spline boss 13
You.

More specifically, the bolt attaching / detaching device 9 is shown in FIG.
As shown in FIG. 2, the main body 14 is supported by a supporting device 16 so as to be able to move up and down so as to be seated on a body flange 15 of the reactor pressure vessel. Inside the main body 14, the spline boss 13 and the rotary pawl member 11 are provided. And a rotation system 17 for rotating the spline boss 13 is provided. In addition, the main body 14 includes the above-described rotary pawl member 11.
There is provided an elevating device 18 for elevating and lowering the rotating system 17 including the spline boss 13 integrally therewith.

As shown in FIG. 2, the lifting device 18
An elevating drive device 19 provided at the upper part of the main body 14, a bar screw member 20 which is driven to rotate up and down by the elevating drive device 19, and an elevating casing 21 connected to a lower end of the bar screw member 20. The main body 14 is provided with an elevating guide 33 for stably elevating the elevating casing 21.

As shown in FIG. 3, a shaft member 22 is connected to the lower end of the elevating casing 21 so as to be able to move up and down, and a measurement hole for the stud bolt 1 is provided below the shaft member 22. 2, a bolt pulling member 23 for pulling out the stud bolt 1 by screwing is connected, and a clutch 24 for engaging and disengaging the pulling member 23 is provided between the pulling member 23 and the shaft member 22. ing.

The outer periphery of the elevating casing 21 is shown in FIG.
As shown in the figure, while surrounding this along the axial direction,
A rotary casing 25 rotatably supported by the elevating casing 21, and a rotary drive device 27 connected via a gear device 26 to rotationally drive the rotary casing 25.
Is provided.

The outer periphery of the rotary casing 25 is provided with a fixed casing 28 surrounding the rotary casing 25 along the axial direction. The outer periphery of the fixed casing 28 is provided with the rotary drive device 27 and the main body 14. A guide member 30 for guiding the ascending and descending along the guide rail 29 is provided, and the fixed casing 28 is attached to the main body 14 through the ascending and descending casing 21 and the rotating casing 2 via the guide member 30.
5 is supported so as to move up and down integrally.

As shown in the figure, the outer peripheral surface of the upper end of the spline boss 13 is fitted to the inner peripheral surface of the lower end of the rotary casing 25, and is connected by being fastened with bolts 31. The outer peripheral surface of the rotary pawl member 11 is spline-fitted to the inner peripheral surface of the lower end portion of the thirteen, and the rotary pawl member 11 is pressed in the direction of the stud bolt 1 between the spline boss 13 and the rotary pawl member 11. A spring member 32 that urges as much as possible is provided.

The spline groove 1 of the spline boss 13
2 is formed to be larger than the spline projection 10 to be engaged therewith, and the engagement groove 3 of the stud bolt 1 is formed.
Similarly, the engagement pin 4 is formed larger than the engagement pin 4 to be engaged therewith.

Thus, the rotary pawl member 13 is allowed to move in the directions indicated by the arrows X and Y shown in FIG. 1 within the margin of engagement of the engagement pins 4 and the spline projections 10 to be engaged. It has become.

Next, when the stud bolt 1 is to be removed from the body flange 15 of the reactor pressure vessel for explaining the operation of the above embodiment, the lower end of the drawing member 23 is screwed in advance to the measurement hole 2 of the stud bolt 1. Then, the body 14 of the bolt attaching / detaching device 9 is seated on the body flange 15 so as to surround the stud bolt 1 to be pulled out, and the elevating casing 21, the rotating casing 25 and the fixed casing 28 are lowered, and 23 and the shaft member 22 are engaged by the clutch 24.

Next, the engaging pin 4 of the rotating pawl member 11 is engaged with the engaging groove 3 of the stud bolt 1, and the rotating pawl member 11 is rotated to unscrew the stud bolt 1. The stud bolt 1 may be removed by raising the member 23. These operations are automatically performed by remote control.

When the rotating pawl member 11 is seated and its axis deviates from the axis of the stud bolt 1, the rotating pawl member 11 engages with the engaging pin 4 and the spline projection 12. It moves in the direction of deviation of the axis within a margin and automatically adjusts the deviation of the axis. Also shown in FIG.
As described above, the rotary pawl member 11 is
Lower end of spline boss 13 while engaging with line boss 13
Because it is possible to slide out from the
Between the top of the tod bolt 1 and the lower end of the spline boss 13
Even if the distance changes, the engaging pin 4 of the rotary pawl member 11
Without disengaging from the engaging groove 3 of the
The rotational force of the emboss 13 is satisfactorily
It can be transmitted to the stud bolt 1 side.

As described above, since the axis of the shaft can be adjusted by the rotary pawl member 11, the centering is facilitated, and it is not necessary to provide a conventional centering machine, and the entire apparatus can be made compact.

[0029]

According to the present invention, the outer periphery of the rotary pawl member fitted to the inner surface of the splice boss has a 9
Since a pair of spline projections are formed at positions rotated by 0 degrees, even if the axis of the rotating pawl member is displaced from the axis of the stud bolt when removing the stud bolt, the displacement of the axis is moved by the rotating pawl member. Is adjusted automatically. Thus, it is not necessary to provide a centering device in the bolt attaching / detaching device as in the related art, and the entire device can be made compact.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view illustrating a main part of a bolt attaching / detaching device of the present invention.

FIG. 2 is a side view illustrating the entire bolt attaching / detaching device.

FIG. 3 is a sectional view taken along a line A in FIG. 2;

FIG. 4 is a schematic perspective view illustrating a conventional bolt attaching / detaching device.

[Description of Signs] 1 stud bolt 2 measuring hole 3 engaging groove 4 engaging pin 10 spline projection 11 rotating pawl member 12 spline groove 13 spline boss 15 trunk flange 17 rotating system

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Seiji Kurokawa 1st Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Pref. A) Hikaru 3-25605 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A bolt attachment / detachment device for implanting stud bolts on a body flange of a reactor pressure vessel, wherein a pair of engagements formed 180 degrees opposite to each other are formed on the inner circumference of a measurement hole at the top of the stud bolts. A groove and a pair of engagement pins which are seated on the top of the stud bolt and engage with the engagement groove at the lower end, and are provided on the outer periphery at a position rotated by 90 degrees with the engagement pin in a longitudinal direction of the stud bolt. a rotary pawl member having a pair of spline projections which protrude so as to extend, connected to a rotary system, as well as fitted to the outer periphery of the rotary pawl member, the spline projection and slide on the inner periphery thereof
De freely and a spline boss having a spline groove to be engaged, a lower end portion of the spline boss said rotary pawl member
A bolt attachment / detachment device characterized by being able to come and go.