JPH01263593A - Upper lid opening and closing device of nuclear reactor pressure vessel - Google Patents

Abstract

PURPOSE:To handle nuts rationally and to contrive the improvement in workability, by transferring the nuts removed from stud-bolts to a nut housing sequentially. CONSTITUTION:An upper lid opening and closing device 1 consists of a rotary table 3, a bolt handling and cleaning device 9, a nut transferring device 10, a nut housing 12, etc. The transferring device 10 transfers vertically ad horizontally a nut G removed from a stud-bolt E, holding the nut with a nut hold, and the nut housing 12 receives the nuts from the transferring device 10 and places the nuts in lines and also the rotary table 3 hangs the transferring device 10 and the nut housing 12 placed closely each other, and rotates them integrally. By this constitution, a continuous work of nut housing, by disposing the nut housing device 12 closely to the transferring device, and the control of the nuts without any mixing of various kinds of the nuts, by housing the nuts in a good order, can be practiced.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a top lid opening/closing device for a nuclear reactor pressure vessel, and in particular,
The present invention relates to a top lid opening/closing device in which a nut removed from a top lid fastening stud bolt is stored inside the device.

"Prior Art" Generally, a reactor pressure vessel in a boiling water nuclear reactor has a configuration shown in FIGS. 13 and 14. The reactor pressure capacity A is constructed by covering the upper part of the vessel body B with an upper cover C, and by penetrating the flange F of the upper cover C with a large number of stud bolts E, which are erected on the flange D of the vessel body B. It is designed to be fastened with a nut G. Symbol ■] indicates a washer.

In such a reactor pressure vessel, various works are carried out with the above-mentioned upper MC removed during nuclear fuel exchange and periodic inspections after the start of reactor operation, but since the work is within a radioactive control area. , there is a need to implement it efficiently with less effort.

Therefore, the present applicant has developed such a device for opening and closing the top cover, for example, “Nut attachment/detaching work equipment” in Japanese Patent Publication No. 59-11433, and “Opening/Closing Equipment for Reactor Pressure Vessel Top Cover” in Japanese Patent Publication No. 141478/1981. A rotating table (frame) is mounted on the upper cover C, and a bolt/nut attaching/detaching unit such as a stud tensioner for loosening the nut G or a nut attaching/detaching device is mounted on the rotating table along the pitch circle of the stud bolt E. The work of attaching and detaching the nut G from the stud bolt E has been automated by suspending it so that it can travel, and using these stud tensioners, etc., to reduce the radiation exposure of workers.

In addition, the nut G and washer H that have been removed from the stub and bolt E will be removed until the top cover C is fixed to the container body B again.
It is moved to a work scaffold provided around the flange F of the upper lid C and stored there. In this case, one nut G is stored near each stud bolt E so that the combination of each stud bolt E and nut G is fixed, so that mixed use does not occur.

``Problem to be solved by the invention'' However, with such technology, due to the relationship between fixing the combination of stud bolt E and nut G,
The work scaffold for storing the nut G also needs to be fixed to the upper 2tC, and work is required to attach and remove it, resulting in a problem that the number of work steps increases. In addition, the work scaffold needs to have high mechanical strength to be able to place all the nuts G and washers H, and in addition to storage space for these nuts G, space for the actual scaffolding is also required. , tend to have a large diameter.

The present invention has been proposed in view of the above circumstances, and aims to provide a top cover opening/closing device that allows nuts to be handled rationally and improves workability.

"Means for Solving the Problems" The present invention provides a rotary table with a nut conveying device that conveys the nut removed from the stud bolt in the vertical and horizontal directions while gripping it with a nut holder, and a nut conveying device that receives the nut from the nut conveying device. The nut storing device for placing the nuts in an aligned state is suspended in close proximity to each other.

In this case, it is preferable that the nut storage device has a structure in which a plurality of nut receivers are arranged along a circulation path and moved by a feeding mechanism.

"Operation" The top lid opening/closing device of the present invention sequentially transports the nuts removed from the stud bolts to the nut storage device using the nut transport device, continuously stores the nuts, and aligns the nuts with the nut storage device. Store it in the state,
It is possible to carry out management that does not cause mixed use, and it is possible to integrally rotate the nut transport bag, the nut storage device, and the nut storage device using a rotating table, and to always arrange the nut storage device near the nut transport device. It is possible.

Further, by arranging the nut receivers side by side along the circulation path, the same part of the circulation path can always be used as the delivery position with the nut conveying device.

"Embodiment" Hereinafter, an embodiment of the top lid opening/closing device of the present invention will be described based on FIGS. 1 to 12.

In the figures, the symbols A to H are the surface numbers of FIGS. 13 and 14.
The parts corresponding to the respective parts of the reactor pressure horn vessel explained in the drawings are shown, and the reference numeral ``■'' indicates the pitch circle of the stud bolt E, and the reference numeral ``■'' indicates the reactor containment vessel. In the overall front view of FIG. 11 and the partial cross-sectional view of FIG.
Code 2 is a fixed sling, code 3 is a rotating table, code 6
Reference numeral 7 indicates a unit lifting device, numeral 7 indicates a unit stand, numeral 8 indicates a stud tensioner, numeral 9 indicates a bolt attachment/detachment cleaning device, numeral 10 indicates a nut conveying device, numeral 11 indicates a positioning device, and numeral 12 indicates a nut storage device.

First, the outline of the top lid opening/closing device 1 will be explained.

As shown in FIG. 11, each leg 13 of the fixed sling 2 is attached to the mounting pieces Ca installed at a plurality of locations on the outer surface of the upper lid C, and the fixed sling 2
A horizontal ring frame 14 is provided on the ring frame 14, and the pitch circle J of the stud bolt E is placed on the ring frame 14.
The ring-shaped turning table 3 disposed above is mounted via a plurality of jaws 15, and is turned by a turning drive mechanism 16, which will be described later.

Further, the central part of the fixed sling 2 is connected to a rotating table 3.
It protrudes upward from the central hole 3a, and the protrusion has a
A hanging piece 19 for suspending the entire top lid opening/closing device 1 is provided, and the projecting portion and the hole 3a of the turning table 3 are connected to each other.
A six-output mechanism is provided to adjust the distance from the inner circumference of the holder.

The six-output mechanism moves the turning table 3 horizontally in the radial direction and arranges it concentrically with the pitch circle J,
A plurality of turning rollers 21 are provided radially between the fixed sling 2 protruding from the hole 3a of the turning table 3 and the inner circumference of the hole 3a of the turning table 3, as shown in FIG.

The swing drive mechanism 16 has a configuration in which a pinion 23 is engaged with a gear 24 and rotated by a drive motor 25.

Four of the unit elevating devices 6 are arranged on the revolving table 3 at intervals of, for example, 90° in the circumferential direction of the pitch circle J, and each unit is connected to three units via an electric servo motor and a deceleration mechanism. The unit base 7 is horizontally attached to the lower end of the lifting rod 28a of each pole screw jack 28 via a swingable link 29, and On the other hand, it is suspended so that it can move horizontally slightly back and forth and left and right.

As shown in FIG. 1 and the like, each unit stand 7 is integrally equipped with a bolt/nut attachment/detachment unit, that is, the stud tensioner 8, bolt attachment/detachment cleaning device 9, nut conveyance device 10, positioning device 11, etc. Of these, a stud tensioner 8 is disposed approximately at the center of the unit base 7, and other bolt attachment/detachment cleaning devices 9 and the like are disposed so as to have a relative positional relationship with respect to the stud tensioner 8, which will be described later.

The stud tensioner 8 is, for example, disclosed in the above-mentioned Japanese Patent Application Laid-open No.
The same technology as the "stud tensioner" described in Publication No. 141478 is applied mutatis mutandis, and it has the function of rotating the nut G while applying tension to the stud bolt E, and is suspended from the unit base 7 by the hanging rod 36. has been done.

The bolt attachment/detachment cleaning device 9 has a structure in which a bolt attachment/detachment mechanism 38 and a bolt cleaning mechanism 39 are housed in parallel and integrally in a housing 37 fixed to the lower surface of the unit base 7. The bolt attaching/detaching mechanism 38 is, for example, a mechanism for suspending the stud bolt E, which is a mechanism for suspending the stud bolt E, by making important use of the technology of the "stud bolt attaching/detaching device" described in Japanese Utility Model Publication No. 17737/1988, which the present applicant previously filed. It has a mechanism for screwing in or loosening the nut G.
This is a structure in which the stud bolt E with the washer H removed is suspended, and the stud bolt E is attached and detached while reducing the load on the threaded part caused by the stud bolt E's own weight. Most of the parts can be moved up and down within the housing 37. Further, the bolt cleaning mechanism 39 includes a bolt attaching/detaching mechanism 38.
The threaded portion of the stud bolt E is cleaned by placing a cylindrical brush over the stud bolt E and rotating it.

The nut conveying device 10 includes a nut attaching/detaching mechanism 41 that attaches and detaches the nut G to and from the stud bolt E while rotating and grips the washer, an elevating mechanism 42 that moves the nut attaching/detaching mechanism 41 in the vertical direction, and a longitudinal direction ( The nut G, which has been loosened by the stud tensioner 8, is removed from the stud bolt E along with the washer I, and then the nut G, which will be described later, is moved. Storage device 1
2.

As shown in FIGS. 7 and 8, the elevating mechanism 42 includes a vertical support frame 45 that is integrally fixed to the lower surface of the unit base 7, and a vertically extending feed screw 46 housed therein. The structure is such that the vertical slide block 47 is moved by rotationally driving the horizontal support frame 48 of the longitudinal movement mechanism 43.
are installed in succession. The back and forth movement mechanism 43 is a feed screw along the back and forth direction housed in the horizontal support frame 48 (see figure waterway).
The structure is such that the front and rear slide blocks 49 are moved by the front and rear slide blocks 49, and the nut attaching/detaching mechanism 4 is attached to the front and rear slide blocks 49.
1 are consecutively installed.

The nut attaching/detaching mechanism 41 includes a nut loosening part 50 that rotates the nut G with respect to the stud bolt E, a nut washer holding part 51 that holds the loosened nut G and the washer r, and a nut G that rotates the nut G with respect to the stud bolt E. and a centering part 52 for positioning with respect to the axis x1 of.

The nut loosening portion 5o has a support ring 55 that is connected to the four front and back slide blocks of the back and forth moving mechanism 43 and extends in the vertical direction, and the support ring 55 is rotated by a drive unit 56 such as a motor. A shaft 57 is provided and rotatably supported by a bearing 58.
A cylindrical wrench 59 that is engaged with the nut G is inserted into the lower end of the wrench so as to be movable up and down, and is pressed downward by a resilient member 60. The cylindrical wrench 59 is
It has an inner diameter larger than the outer diameter of the stud bolt E, and a protrusion 59a is disposed at the lower end thereof to be engaged with a plurality of locking grooves Ga formed radially in the head of the nut G. By rotating the projection 591 while engaging the nut G, the lifting mechanism 12 raises the nut G in synchronization with the loosening of the nut G.
is removed from stud bolt E.

On the other hand, the nut washer holding part 51 has a bracket 61 protruding from the outer side of the support ring 55 as shown in FIG.
A cylindrical case 62 surrounding the cylindrical case 62 is freely suspended via a hanging arad 63, and a nut holder 64 and a washer holder 65 are disposed at the lower end of the case 62. ing. In the illustrated example, the nut retainer 64 is constituted by a cylinder, and a plurality of nut retainers 64 are fixed to the outer circumferential portion of the case 62 so as to face inward at mutual intervals in the circumferential direction, and the protruding rods 66 penetrate through the wall of the case 62. These protruding rods 66 are arranged so as to be on the same horizontal level, and the nut G is placed thereon. Further, the washer retainer 65 is provided with a ring-shaped clamp membrane 67 made of rubber or the like along the circumferential direction on the inner circumference of the case 62 at a position below the nut retainer 64. A compressed air supply system 68 is connected to the space between the inner circumferential surface of the case 62 and the outer circumference of the washer 1-1 by expanding the clamp membrane 67 inwardly of the case 62 with compressed air. It is designed to be gripped by pressing the part.

Further, in the centering part 52, an elevator 70 such as a cylinder is attached to the upper surface of an end plate 69 that closes the upper part of the case 62, and a guide rod 7K that is moved up and down by the elevator 70 passes through the end plate 69. A centering roller 72 is protruded coaxially with the cylindrical wrench 59 into the case 62, and a centering roller 72 is supported on the outer periphery of the guide rod 71. A cap 73 is provided in series.

Three centering rollers 72 are arranged on a bracket 74 that is rotatably fitted onto the guide rod 71 at intervals of 120' in the circumferential direction, and their spindles 75 are arranged parallel to the tangential direction of the guide rod 71. The circumscribed circle of these three centering rollers 72 is set to be the same as the inner diameter of the nut G. The centering cap 73 has a tapered surface 73a on its inner peripheral surface.
The center X of the circumscribed circle of the centering roller 72 is formed by being placed over the tapered portion Ea formed at the head of the stud bolt E.

is aligned with the axis xl of the stud bolt E. The case 62 includes a connecting portion between the support ring 55 and the front and rear slide blocks 49, and a rotation shaft 5.
A hole 62a is provided through which a connecting portion between the drive unit 7 and the drive unit 56 is inserted.

The stud tensioner 8, the bolt attachment/detachment cleaning device 9, and the nut conveyance device IO are connected to the stud bolt E.
They are supported by the unit stand 7 along a pitch circle J at intervals that are integral multiples of the pitch. In other words, in terms of the spacing with respect to the stud tensioner 8, as shown in FIGS.
The nut attaching/detaching mechanism 41 of O is quadrupled on the side opposite to the bolt attaching/detaching mechanism 38, and its vertical support frame 45 is disposed offset to the outside of the pitch circle J.

Further, the positioning device 11, as shown in FIG.
The main positioning part 8 is integrated with the vertical support frame 45 in the nut conveying device 10! and a sub-positioning section 82 attached to the housing 37 of the bolt attachment/detachment cleaning device 9. Each of these positioning parts 81 and 82 is supported by a plurality of rollers 84 made of hard rubber or the like supported by a cylindrical rod 83 of a continuous cast form on the vertical support frame 45 or by the housing 37, and inside of these rollers 84. The tangent circle is set to be the same as or slightly smaller than the outer diameter of the stud bolt E, and by covering the stud bolt E with the roller 84, the axis of the stud bolt E and the center of the inscribed circle are aligned. The configuration is for positioning.

The main positioning part 81 is spaced apart from the stud tensioner 8 along the pitch circle J of the stud bolt E by twice the pitch, and the sub positioning part 82 is spaced apart from the stud tensioner 8 by a pitch circle J of the stud bolt E. The stud tensioner 8 and the like installed on the unit base 7 are aligned with the bolt pitch circle J of the stud bolt E by these positioning parts 81 and 82. It is intended to be placed in the same position.

Said nut storage device! 2 are suspended from the rotating table 3 at 90° intervals so as to be placed between each unit base 7, and are suspended horizontally from the rotating table 3 by a suspension rod 91. A plurality of nut receivers 93 are arranged movably on a base plate 92 arranged along a circulation path 94.

The base 92 is formed into a flat box shape, and its f
The circulation path 94 is formed by a slit 96 passing through EQ5. As shown in FIG. 3, a part of the circulation path 94 is disposed on the back-and-forth movement locus of the nut attaching/detaching mechanism 41 in the nut conveying device 10, and its position is determined as the nut transfer position with respect to the nut conveying device 10. A
It is said that

Further, the nut receiver 93 is mounted on a support plate 97 on which the washer H is placed, as shown in FIGS.
A stepped pin 98 to be inserted into the nut G is provided protrudingly, and a rod 99 is protrusively provided on the back surface of the support plate 97, and the rod 99 is engaged with the circulation path 94 of the base 92 in a penetrating state. There is.

The stepped pin 98 has a tapered portion 98a formed at its tip, and the outer diameter of its base end 98b is set to be slightly larger than the inner diameter of the nut G and smaller than the inner diameter of the washer H. . That is, when the nut G and the washer H are extrapolated onto the stepped pin 98, the washer H is arranged so as to surround the base end 98b, and the base end 98
The nut G is placed on the upper end of the nut G (see Fig. 12(f)). A space is created in which the rod 66 can be inserted.

On the other hand, inside the base 92, a chain 101 or a plurality of sprockets 102 is stretched along the circulation path 94.
Rods 99 of each nut receiver 93 passing through the lid 95 are fixed to the chain 101 at equal intervals,
These chain lots, sprockets 102, and their driving portions 103 constitute a feeding mechanism 104 for the nut receiver 93. Note that the circulation path 94 includes:
A plurality of free bearings 105 are arranged near the slit 96 to support the back surface of the support plate 97 of the nut receiver 93.

Next, a case will be described in which the upper cover C is removed from the vessel body B of the reactor pressure vessel A using the upper cover opening/closing device 1 having such a configuration.

By suspending the hanging piece 19 of the top lid opening/closing device 1, the fixed sling 2, the turning table 3, each bolt/nut attachment/detachment unit, the nut storage device 12, etc. are transported as one unit.
Mounted on the upper MC and fixed sling 2 to its mounting piece Ca.
Fix the legs 13 of.

Driving the turning table 3 by the turning drive mechanism 16,
Each unit stand 7 is moved along the pitch circle J, and the stud tensioner 8 is placed above the intended stud bolt E.

Next, the internal mechanism surrounded by the stud tensioner 8, the nut attaching/detaching mechanism 41 of the nut conveying device 10, and the housing 37 of the bolt attaching/detaching cleaning device 9 is raised upward, and the unit elevating device 6 lifts the unisolated nut stand 7. The unit base 7 is lowered and positioned by the positioning device 11, and the stud tensioner 8 and the bolt attachment/detachment cleaning device 9 are placed on the axis of the stud bolt E, respectively.

Then, after engaging the stud tensioner 8 with the stud bolt E and loosening the nut G, the unit base 7 is raised, and thereafter, the same operation as described above is repeated by rotating the unit by one pitch. Gradually loosen Natsu's G.

On the other hand, in the nut conveying device IO, the nut attaching/detaching mechanism 41 is disposed above the stud bolt E in which the nut G is loosened, and the nut G is removed after the unit base 7 is lowered, and the removed nut G is removed. is stored in the nut storage device 12.

This nut removal work and storage work will be explained in detail with reference to FIGS. 12(A) to 12(E). First, as shown in FIG.
0 to lower the centering cap 73 and cover the tapered portion Ea of the stud bolt E. Next, while fixing the position of the centering cap 73 and discharging the fluid on the piston end side, the support ring 55 is lowered by the elevating mechanism 42, and the case 62 is lowered as shown in FIG. 12(b).
is placed on the nut G, and the cylindrical wrench 59 of the nut loosening portion 50 is engaged with the locking groove Ga of the nut G. Then, the drive unit 56 of the nut loosening unit 50 is put into operation,
While rotating the cylindrical wrench 59, the nut loosening part 50 is raised by the elevating mechanism 42 so as to be synchronized with the loosening of the nut G. At this time, as shown in Figure 12 (c),
As the nut G rises, the nut retainer 64 is inserted between it and the washer H.
Secure a gap into which the ejector rod 66 can be inserted. Next, compressed air is sent into the space of the washer holder 65 to expand the clamp membrane 67 radially inward, thereby holding the washer 1-1.

After removing the nut G from the threaded portion of the stud bolt E as shown in FIG. 12(c), the ejector rod 6
6 is inserted and nut G is placed on it,
Pull up the stud bolt E as shown in FIG. 12(d).

Next, after the unit base 7 is raised to the position shown by the chain line in FIG. Place it directly above the . In this case, in the nut storage device 12, the nut receiver 93 is kept on standby at the delivery position A. And the 12th
As shown in Figure (E), the nut attaching/detaching mechanism 41 is lowered by the elevating mechanism 42 so as to cover the nut receiver 93. When the nut G and the washer () are placed over the nut receiver 93, the washer () is placed around the base end 98b of the stepped pin 98 of the nut receiver 93, and the nut is placed on the upper end of the base end 98b. G is placed, and a gap is formed between them.Next, the holding state by the nut retainer 64 and washer retainer 65 is released, and
As shown in FIG. 12(f), the nut attaching/detaching mechanism 41 is raised and placed on standby above the pitch circle J of the stud bolt E for the next nut removal operation.

On the other hand, the nut storage device I2 holds the nut G and the washer I.
When the nut receiver 93 is received, the nut receiver 93 is moved one pitch and advanced along the circulation path 94, and the next nut receiver 93 is placed at the nut transfer position A.

In this way, the unit base 7 is
All the nuts G and washers H are removed by moving the stud bolt E one pitch at a time, and each bolt/nut attachment/detachment unit is responsible for 174 rotations. Circulation path 9
While intermittently moving the nut receiver 93 along 4,
The removed nut G and washer H are sequentially stored.

In addition, in parallel with this kind of nut G removal work,
The stud bolts E, which are the passage points for nuclear fuel during nuclear fuel exchange, and some of the stud bolts E, which are to be inspected, are pulled out from the flange D of the container body B by the bolt attachment/detachment cleaning device 9, and then the hanging piece 19 of the fixed sling 2 is removed.
A crane or the like is connected to the fixed sling 2, the rotating table 3, the upper cover C, etc. are suspended together and transported to the operation floor for storage.

On the other hand, when attaching the upper MC to the vessel body B after nuclear fuel exchange or periodic inspection, etc., suspend the upper cover C on the operation floor together with the upper cover opening/closing device l, and place it over the vessel body B. The stud bolt E is fastened using each bolt/nut attachment/detachment unit.

Next, to explain the installation work of the nut G during this tightening, the nut transfer position A of the nut storage device 12 is
Place the target nut G in the hole, and place the nut attaching/detaching mechanism 41 directly above the nut receiver 93 as shown in FIG.
The washer H is held by the washer holder 65, and the protruding rod 66 of the nut holder 64 is inserted into the gap between the washer H and the nut G, as shown in Fig. 12 (E). After holding the nut G and washer H as shown, the lifting mechanism 42 and the forward/backward moving mechanism 43 are driven to move the nut attaching/detaching mechanism 41 directly above the held nut G, etc. and the corresponding stud bolt E in FIG. Arrange as shown in d). Then, as shown in FIG. 12 (G), after the centering cap 73 is placed over the tapered part Ea of the stud bolt E, the nut G is screwed onto the stud bolt E by the lifting mechanism 42 and the nut loosening part 50. while lowering it. At this time, the taper portion Ea of the stud bolt E
The center Xt of the circumscribed circle of the centering roller 72 is set by the centering cap 73 placed on the stud bolt E.
Since the circumscribed circle is set to have the same outer diameter as the threaded portion of the stud bolt E, the nut G is aligned with the axis X of the stud bolt E while contacting the centering roller 72. It is guided along the center X, and is accurately screwed into the threaded portion of the stud bolt E. Then, in the middle of the screwing, the holding state by the nut retainer 64 was released, and the nut G was fastened to the stud bolt E as shown in FIG. 12 (H), and the holding state by the washer retainer 65 was also released. Thereafter, the nut attaching/detaching mechanism 41 is raised to complete the attachment of the nut G to the stud bolt E.

Thereafter, the stud tensioner 8 is used to firmly fasten the bolts.

As described above, this top lid opening/closing device 1 has a rotating table 3.
The nut G can be continuously attached/detached and stored by the nut conveying device 1O and the nut storage device 12, which are suspended in close proximity from each other.In this case, the nut transfer position A between them is always the same. Because it is set in the position,
This simplifies the operation of the nut conveying device 10 and allows the nut G to be transferred smoothly and reliably. Further, since one nut storage device 12 is provided for each of the four sets of bolt/nut attachment/detachment units, each nut storage device 12 only needs to have a space for storing nuts G for 1/4 turn.

In addition, in the nut storage device, one of the nut receivers is colored so that it can be distinguished from the others, or one nut receiver is provided, for example, one more than the number of nuts to be stored, so that the empty space left after the nuts are stored is It may also be configured such that the storage order can be recognized based on the nut receiver.

Further, in the nut conveying device, the nut may be directly held by the cylindrical wrench, such as by configuring the cylindrical wrench with a magnet. Furthermore, a ring-shaped work scaffold may be suspended from the revolving table so as to surround the flange of the top cover. In this case, there is no need to fix the work scaffold to the flange during nut attachment/removal work, so the revolving table and It is possible to rotate the force in one piece.

"Effects of the Invention" As explained above, the top lid opening/closing device of the present invention can provide the following effects.

(1) Since the nuts are stored in a row in the nut storage device located close to the nut conveying device, it is possible to manage the nuts so as not to mix them.

(11) Since the nut conveying device and the NAND storage device can be rotated together by a rotating table, it is possible to continuously convey and store nuts that are attached to and removed from a series of stud bolts. Regardless of the operation of the turning table, both devices ξ can always be kept close to each other, and nuts can be transferred smoothly and reliably, greatly improving work efficiency.

(iii) When a work scaffold is provided, it can be used to the maximum extent as a scaffold and can be made smaller in diameter, compared to the conventional technology in which the work scaffold is provided with a nut storage function.

[Brief explanation of the drawing]

Figures 1 to 12 show an embodiment of the reactor pressure vessel top lid opening/closing device according to the present invention. Partially omitted plan view, Figure 3 is I of Figure 1.
4 is a front view showing a part of the nut storage device, FIG. 5 is a plan view thereof, and FIG. 6 is a longitudinal sectional view taken along line Vl-Vl in FIG. 5. , FIG. 7 is a longitudinal cross-sectional view of the nut conveying device, FIG. 8 is a cross-sectional view taken along the line ■-■ in FIG. 7, FIG. 9 is a cross-sectional view taken along the line IX--IX in FIG. The 1θ diagram is an arrow view along the X-X line in Figure 7,
Figure 1 is an overall front view of the top lid opening/closing device, Figures 12 (A) to 12 (H) are longitudinal sectional views showing the state of the nut attachment/detaching mechanism in each step of the nut attachment/detachment work, and Figure 13 is a nuclear reactor. FIG. 14 is a partially omitted vertical cross-sectional view showing the structure of the pressure vessel, and is an enlarged view of the portion surrounded by the chain line in FIG. 13. A: Reactor pressure vessel, B: Vessel body, C: Top lid, Ca: Mounting piece, D: Body Flange, E...Stud bolt, F...Top lid flange, G...
Nut, H...Washer, J...Pitch circle, K...Reactor containment vessel, L...Top lid opening/closing device, 2...・Fixed sling, 3... Turning table, 6... Unit lifting device, 7... Unit stand, 8...
...Stud tensioner, 9...Bolt attachment/detachment cleaning device, lO...Nut conveyance device, 1! ...
... Positioning device, 12 ... Nut storage device, 16 ... Rotating drive mechanism, 23 ... Telescopic arm, 28 ... Pole screw jack, 28a
...Lifting rod, 29...Link, 3
0...Pin, 37...Housing, 3
8... Bolt attachment and detachment mechanism, 39... Bolt cleaning mechanism, 41... Nut attachment and detachment mechanism, 12.
...Lifting mechanism, 43... Back and forth movement mechanism, 4
5... Vertical support frame, 46... Feed screw, 47... Vertical slide block, 48...
... Horizontal support frame, 49 ... Front and rear slide block, 50 ... Nut loosening part, 51 ...
... Nut washer holding part, 52 ... Centering part, 55 ... Support ring, 56 ... Drive part, 57 ... Rotating shaft, 58... Bearing, 59... Cylindrical wrench, 59a... Protrusion, 61... Bracket, 62... Case, 63... ...Hanging rod, 64...
...Nut retainer, 65...Washer retainer, 66
...Extrusion rod, 67...Clamp membrane, 68...Compressed air supply system, 69...
End plate, 7o... Elevator, 71... Guide rod, 72... Centering roller, 73
... Centering cap, 733 ... Tapered part, 74 ... Bracket, 75 ...
Support shaft, 81... Main positioning part, 82...
・Sub-positioning part, 83... Cylindrical rod, 84.
...Roller, 9I...Hanging rod, 92
...Base, 93...Nut holder, 94
...Circulation path, 95...Lid, 96...
...Slit, 97...Support plate, 98...
...Stepped pin, 98a...Tapered part, 98
b... Proximal end, 99... Rod, 10
1... Chain, 102... Sprocket, +03... Drive section, 104...
Feed mechanism, 105...Free bearing, X,
・・・・・・Axis of stud bolt, X, ・・・・・・
Center of the circumscribed circle of the centering roller. Applicant: Ishikawajima-Harima Heavy Industries Co., Ltd. Figure 9 Figure 12 (G) Figure 12 (H) b

Claims (2)

[Claims] (1) A nut transporting device that transports the nut removed from the top lid fastening stud bolt in the vertical and horizontal directions while gripping the nut removed from the top lid fastening stud bolt with a nut holder, and the nut transporting device is mounted on a rotating table mounted on the upper lid of the reactor pressure vessel. A top lid opening/closing device for a nuclear reactor pressure vessel, characterized in that a nut storage device for placing nuts received from the device in an aligned state is suspended in a close state. (2) The nut storage device is provided with a plurality of nut receivers arranged along a circulation path and a feeding mechanism for moving these nut receivers. Reactor pressure vessel top lid opening/closing device.