JPH01234657A - Opening and closing device for pressure container - Google Patents

Abstract

PURPOSE:To aim at shortening the working time by constituting an installation vehicle with a first carrier vehicle mounted thereon with a bolt cleaning device and a stud tensioner and a second carrier vehicle mounted thereon with a nut attaching and removing device, and by making the second carrier vehicle movable in a direction orthogonal to the direction of arrangement of bolts, relative to the first carrier vehicle. CONSTITUTION:A bolt cleaning device 14 and a stud tensioner 15 are attached to a first installation carrier vehicle 25 which can be centered by means of a motor 23 and which is mounted on a station 13 that can be driven along a ring-like guide rail 12 in the direction of arrangement of stud bolts 3-0-3-4. A second installation vehicle 26 mounted thereon with a nut attaching and removing device 16 and a motor 27 for moving nuts 4-0-4-4 toward a setting bed is arranged on the station 13 so as to be movable relative to and along the installation vehicle 25. Accordingly, the nut conveyance can be made by the nut attaching and removing device 16 alone while the nut fastening by the stud tensioner 15 and the nut conveyance can be simultaneously carried out, thereby it is possible to shorten the working time.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pressure vessel opening/closing device that opens and closes the top cover of a nuclear reactor pressure vessel, for example, and particularly relates to a pressure vessel opening/closing device that opens and closes the top cover of a reactor pressure vessel, and in particular, a device for tightening the top cover of a pressure vessel with stud bolts and bolts. This relates to an opening/closing device for a pressure vessel.

[Conventional technology]

As shown in FIG. 8, the reactor pressure vessel consists of a pressure vessel body 1 and an upper cover 2, which is a closed head placed on the pressure vessel body 1.
The structure is such that the pressure vessel body 1 and the upper lid 2 are sealed by tightening them with 70 to 80 stand bolts 3 and nuts 4. FIG. 9 is a detailed enlarged view of section B in FIG. 8. The star end bolt 3 is connected to the pressure vessel body 1 by a lower threaded portion 7 of the star end bolt 3 which is threadedly engaged with a female threaded portion 6 formed on the body flange 5G of the pressure vessel body 1, and protrudes from the upper surface thereof, and on the other hand, The stud bolt 3 is inserted through a bolt hole 10 having a diameter larger than the outer diameter of the upper threaded part 9 of the stud bolt 3 formed in the upper cover flange 8, and the upper threaded part 9 at the other end projects outside the upper cover flange 8.

A nut 4 is screwed into this threaded portion 9, and the tightening force of the nut 4 firmly connects the upper cover 2 and the pressure vessel body 1 with the stand bolt 3. The stud bolts 3 and nuts 4 are arranged in a circular shape along the fire spreading direction of the upper cover 2 and the pressure vessel body 1 at a pitch that is an integral multiple of the stud bolts 3.

In order to confirm the safety of the reactor, the upper cover 2 of the pressure vessel main body 1 was removed and the interior was inspected (internal inspection).
-3service inspection, etc. must be conducted during the service period.

At that time, the upper threaded portion 9 of the stud bolt 3 is cleaned by removing any deposits, the stud bolt 3 is tensioned, and then the nut 4 is rotated and removed, as shown in FIG. A switching device shown in FIGS. 11 and 12 is provided. The opening/closing device includes a bolt cleaning device 14, a stud tensioner 15, and a nut attaching/detaching device 1.
It is equipped with 6. However, in the vicinity of the reactor pressure vessel, there is a problem of radiation exposure for workers due to the relatively high radiation level in the working atmosphere. installation work, and installation/detachment work using the Nara 1 to the installation/detachment device 16 are being performed.

Hereinafter, the outline of the opening/closing device will be explained using FIG. 10, FIG. 11, and FIG. 12. Figure 10 is a front view of the switchgear,
11 is a plan view of FIG. 10, and FIG. 12 is an enlarged perspective view of essential parts of the opening/closing device of FIG. 10.

10 to 12, 2 is an upper lid, 3 is a stud port, 4 is a nut, and 8 is an upper lid flange of the upper lid 2. 11 is a frame for supporting the entire switchgear;
This pedestal 11 is fixed to the upper lid 2. 12 is a guide rail installed on the pedestal 11, and 13 is a drive morph A.
19 is a station that operates on the guide rail 12 along the arrangement direction of the stud bolts 3. This station 13 is equipped with a bolt cleaning device 14, a stud tensioner 15, and a nut attaching/detaching device 16 via a loading cart 18.
is installed. 17 is a position detector for the stud port 3. 20, 21 and 22 are bolt cleaning devices 14. Stud tensioner 15. Nut attachment/detachment device 16
drive motor B, drive motor C1 and drive motor D. 23 is stud port 3 and stud tensioner 1
Correcting the misalignment of 5 and mounting the nut 4 on the cart 1 when installing and removing it.
8 in a direction perpendicular to the arrangement direction of the stud ports 3.

Numeral 24 is a nut holder for storing the nut 4 after it has been removed from the stud port 3.

In addition, in the apparatus shown in FIG. 11, the bolt cleaning device 14
, a state in which four stations 13 to which stud tensioners 15 and nut attaching/detaching devices 16 are attached are arranged in the circumferential direction is shown.

Figures 13 and 14 are similar to Figures 10, 11, and 12.
This is to explain the conventional sequence of tightening the stud port 3 and removing the nut 4 using the opening/closing device shown in the figure. , but for convenience of explanation, stud bolt 3 and stud bolt 3-0.3-1.3 are shown.
-2.3-3.3-4.3-5.3-6, and the nuts 4 corresponding to those stud bolts are also 4-0.4-1.
．． It is called 4-2.4-3.4-4.4-5.4-6. The stud bolts 3-1 to 3-6 correspond to the stud ports 3-0 to 3-6 in FIG. 14. In addition, A in FIG. 13 is a bolt cleaning device 14 that removes rust from the stand bolt 3.
B is the position detection of the stand bolt 3 by the position detector 17, the work of correcting the misalignment of the stud bolt 3 and the stud tensioner 15, and the stand bolt 3
C indicates the tensioning work of the nut 4, C indicates the attachment/detachment of the nut 4 using the nut attachment/detachment device 16, and D indicates the conveyance operation of moving the nut 4 removed from the stud port 3 to the stand 24. The ○ mark in FIG. 13 indicates the position detection. Only the position detection of the stud bolt 3 by the device 17 and the misalignment correction work between the stud bolt 3 and the stud tensioner 15 are shown.

The opening/closing device moves clockwise as shown by the arrow in FIG. 14, and along the moving direction of the station 13, the bolt cleaning device 14 is placed at the top as shown in FIGS. 10 to 12. A stud tensioner 15 is located in the center, and a nut attaching/detaching device 16 is located at the rear. Further, the pitch between the stud bolts 3 shown in FIG. 12 is the same as the pitch of the bolt cleaning device 14, the stud tensioner 15, and the nut attaching/detaching device 16.

Step No. from step N001 in FIG.

By performing the work up to 12, cleaning work A for the five stud bolts from stud bolts 3-1 to 3-5 in Figure 14, and cleaning work for the five stud bolts from stud bolts 3-1 to 3-5 are completed. Nuts 4-1 to 4-5 screwed onto B1 stud bolts 3-1 to 3-5
5 nuts removal work C, nuts 4-1 to 4
This means that the nut conveyance work up to -5 has been carried out, and stud bolts 3-'o and 3-6 are used only for position detection B.

In this manner, the upper cover 2 can be removed from the pressure vessel body 1 by removing the nuts 4 from the stud bolts 3 shown in FIGS. 8 and 9.

[Problem to be solved by the invention]

However, the above prior art switchgear has a bolt cleaning device 1.
4. Since the stud tensioner 15 and the nut attaching/detaching device 16 are installed on the same single mounting cart 18, the bolt cleaning device 14, stud tensioner 15, and nut attaching/detaching device 16 are simultaneously moved in the radial direction by the drive motor E23. The structure is. Therefore, the nut 4 removed from the stud bolt 3-1 by the nut attaching/detaching device 16
-1 to the position of the nut holder 24, it is necessary to move not only the nut attaching/detaching device 16 but also the bolt cleaning device 14 and stud tensioner 15 to the nut holder 24.

In steps No. 3.5 and 7.9 shown in FIG. 13, since the tensioning work B in the stud tensioner 15 takes the longest time, the removing work C of the nut 4 from the stud bolt 3 by the nut attaching/detaching device 16 is completed. However, the nut 4 cannot be carried out immediately and is in a state of waiting for the tensioning work B to be completed. Bolt cleaning work A
and tensioning work B and nut removal work C
It is necessary to carry out the work of transporting the nut 4 after all the steps have been completed. For this reason, there is a disadvantage in that there is loss in the nut conveying operation and the overall working time is increased.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pressure vessel opening/closing device that solves the above-mentioned problems of the prior art, improves the efficiency of the top cover opening/closing operation, and reduces radiation exposure to workers.

[Means to solve problems]

The above purpose is to separate the loading truck into a loading truck with a nut attaching/detaching device attached, and a loading truck with a bolt cleaning device and a stud tensioner attached, so that the loading truck with the nut attaching/detaching device can remove the bolt cleaning device and stud tensioner. This is achieved by configuring the system to move with reference to the attached mounting carriage and the mounting carriage engaged by gears.

[Effect]

The mounting cart to which the nut attaching/detaching device is installed operates separately from the mounting cart to which the bolt cleaning device and stud tensioner are attached. Even if the work of the tensioner or bolt cleaning device is not completed, the nut can be lifted up by the nut attaching/detaching device and moved to the nut device stand, and step No.
4.6.8.10 The operation time for nut conveyance work can be shortened.

Further, since the mounting cart to which the nut attaching/detaching device is attached is connected to the mounting cart to which the bolt cleaning device and stud tensioner are attached via gears, it can be moved simultaneously with the mounting cart. Therefore, by stopping the loading truck equipped with the nut attaching/detaching device and other loading trucks at relative positions that serve as a reference, it is possible to correct the misalignment of the loading truck equipped with the stud tensioner.
At the same time, alignment of the nut attaching/detaching device with the stud bolt can be performed at the same time.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 to 4.

FIG. 1 is an enlarged perspective view showing an embodiment of the top lid opening/closing device according to the present invention, and FIGS. 2 and 3 are a front view and a plan view of the embodiment.

As shown in FIGS. 1 to 3, this opening/closing device is connected to stud bolts 3-0 to 3-3 along an annular guide rail 12 fixed to the upper lid 2 of the pressure vessel body 1 by a frame 11.
A station 13 is installed which can be driven in the arrangement direction. 13 studs Porto 3-0 on this station
~3-4 Drive motor E23 for center alignment adjustment
Bolt cleaning device 14 attached to a loading trolley A25 having
and a stand tensioner 15, and a nut attaching/detaching device 16 attached to a mounting cart B26 having a drive motor F27 for moving the nuts 4-0 to 4-4 to the nut holder 24 during nut attaching/detaching work.

Moreover, FIG. 4 is an enlarged detailed view of part A in FIG. 3.

As shown in FIG. 4, in this embodiment, a drive motor F27 for moving the loading truck B26 is attached to the loading truck B26, and this drive motor F27 has a gear A28 provided on the loading truck A25. A meshing gear B29 is provided. By meshing the gear A2B of the loading truck A25 and the gear B29 of the loading truck B26, the loading truck B26 has a mechanism that allows relative movement along the gear A28 of the loading truck A25.

In addition, in FIG. 1, the pitch of the stand bolts 3-0 to 3-4 and the pitch of the bolt cleaning device 14, stud tensioner 15, and nut attaching/detaching device 16 located at a preset reference position are the same pitch, and the pitch of the stand bolts 3-0 to 3-4 is the same. The axes of the bolt cleaning device 14, stud tensioner 15, and nut attaching/detaching device 16 are connected to the position detector 17 and the drive motor e.
23, the stud tensioner 15 is aligned by simply aligning the center of the stud tensioner 15.

Stud bolt 3 using the switchgear configured as above
-6th sequence when performing tightening work from 0 to 3-4
This will be explained below based on FIGS.

Steps N011 and 2 in FIG. 6 are the 13th step of the prior art.
Since the operation is the same as that explained in the figure, it will be omitted here.

The transition to step NO63 in FIG. 6 is to move the station 13 in the direction shown by the arrow in FIG.
After confirming the position of the bolt 3-2 in the figure with the position detector 17 of the stand bolt tensioner 15, the bolt 4-1 screwed onto the bolt 3-1 in FIG. is removed from the head bolt 3-1. At the same time, the bolt 4-2 of the stud bolt 3-2 is tightened by the stud tensioner 15, and the stud bolt 3-3 is cleaned by the bolt cleaning device 14. Therefore, in the conventional switchgear, in step 4, the nut 4-1 is
In order to carry out the nut transportation work, it was necessary to wait until the nut cleaning device 14 completed the cleaning work A of the bolt 3-3 and the stud tensioner 16 completed the tensioning work B of the bolt 3-2. However, in the embodiment of the present invention, since the nut 3 can be transported only by the nut attaching/detaching device 16, the other bolt cleaning device 14 performs the cleaning work A of the bolt 3-3, and the stud tensioner 16 performs the cleaning work A of the bolt 3-3. This can be done in parallel with the tensioning work B of the bolt 3-2.

In step N004, the nut attaching/detaching device 16 of the mounting cart B26 is moved to be on the pitch of the bolt 3-2, the bolt cleaning device 14 of the mounting cart A25 is moved to be on the pitch of the bolt 3-4, and the stand tensioner 15 is moved to be on the pitch of the bolt 3-3. , the mounting cart A25 is stopped at the reference position, the drive motor E23 of the mounting cart A25 is driven, and the stand tensioner 15 aligns the center of the stand and port 3-3. At this time, the gear B29 of the loading truck B26 is the gear A2 of the loading truck A25.
8, the nut attaching/detaching device 16 can also be aligned with the stud bolt 3-2 at the same time.

After correcting the misalignment with the stud bolt 3-3, the bolt cleaning device 14 moves to Pol) No. 3-4 and the stud tensioner 1.
5 to the bolt 3-3, and the nut attaching/detaching device 16 to the bolt 3-3.
2 and perform their respective tasks at the same time. The nut 4-2 removed from the stud port 3-2 by the nut attaching/detaching device 16 is held by the nut attaching/detaching device 16,
It is lifted together with the nut attaching/detaching device 16 by the drive motor B20. The lifted nut attaching/detaching device 16 is moved toward the nut holder 24 by moving the drive motor F27 clockwise.

The nut 4-2 lifted by the nut attaching/detaching device 16 is lowered onto the nut holder 24, and the driving motor F27 is reversely rotated to return the mounting cart B26 to its original position. At this time, the bolt cleaning device 14 and the stud tensioner 15
is attached to the loading trolley A25, so it does not move, and is used for cleaning work A and tensioning work B.
I do.

In this way, by repeating the same operations up to Step 7 in Figure 6, the nuts from bolts 3-1 to 3-5 can be removed C, and the nuts from bolts 3-1 to 3-5 can be removed. Tightening work B, bolts 3-1 to 3-
Cleaning work A up to 5 is performed.

In step 6 of Fig. 6, the nut tightening work B of bolt 3-5 and the nut removal work C of bolt 3-4 shown in Fig. 7 are performed.
and nut transportation work is performed, and in step N007, bolt 3-6 is used only for position detection work B, and bolt 3-6 is used only for position detection work B.
Nut removal work C and nut transportation work in step 5 are completed.

In this way, in the embodiment of the present invention, the loading trolley A2
5 and loading trolley B26 are divided into loading trolleys A25 and B26.
By connecting with gears A2B and B29,
While the bolt cleaning device 14 is performing bolt cleaning work A1 and the stud tensioner 15 is performing tensioning work B,
The nut attaching/detaching device 16 can shorten the working time by performing the nut removing work C and the nut transporting work.

FIG. 5 shows the aforementioned opening/closing device in which a drive motor F27 is attached to a mounting trolley A25, and a mounting trolley B26 is connected via gears A and 29 provided on the drive motor F27 and a gear B2B attached to a mounting trolley B26. Loading trolley A2
An example of a mechanism that can move relative to 5 is shown.

Therefore, the only difference between the device in FIG. 4 and the device in FIG. 5 is that gear A29 and gear B2B are installed in reverse, and the other explanations are the same as in FIG. 4. Therefore, the explanation will be omitted.

In the above embodiments of the present invention, the nut removal work C
Although the explanation has focused on tightening nuts after the internal inspection is completed, the opening/closing device of this embodiment can also be used for tightening nuts.

〔Effect of the invention〕

As described above, according to the present invention, the nut removed by the nut attaching/detaching device could not be transported to the nut holder until the nut tightening work by the stud tensioner was completed, but the tensioning work by the stud tensioner Even inside the nut, the nut removed by the nut attachment/detachment device can be transported to the nut holder, so while tightening the nut with the stud tensioner, the nut can be transported by the nut attachment/detachment device at the same time, reducing work time and This can be achieved by reducing the radiation exposure of workers. ,

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a switchgear according to the present invention, FIG. 2 is a front view of FIG. 1, and FIG. 3 is a plan view of FIG. 1.
FIG. 4 is an enlarged plan view of part A in FIG. 3, FIG. 5 is an enlarged perspective view of main parts showing another embodiment of the present invention, and FIG. Figure 7 is a diagram showing the arrangement of the stud ports in Figure 6, Figure 8 is a longitudinal section of the pressure vessel, Figure 9 is an enlarged sectional view of section B in Figure 8, and Figure 10 is a front view of the conventional switchgear. 11 is a plan view of FIG. 10, FIG. 12 is an enlarged perspective view of the main part of FIG. 10, and FIG. 13 is an opening/closing operation using the conventional opening/closing device shown in FIGS. The work sequence diagram, FIG. 14, is a diagram showing the arrangement of the stud bolts in FIG. 13. 1...Pressure vessel body, 2...Top lid, 3
...Stud bolt, 4...Nut,
5...Body flange, 6...Female threaded part, 7...Lower threaded part, 8...Top lid flange, 9...Top Threaded part, 10... Bolt 7L. 11... Frame, 12... Guide rail, 13... Station, 14... Bolt cleaning device, 15... Stud tensioner,
16... Nut attachment/detaching device, 17... Position detector, 19... Drive motor A, 20...
... Drive motor B, 21... Drive motor C1
22...Drive motor C123...Drive motor E, 24...Near)? ff stand, 25・
...Mounting trolley A, 26...Mounting trolley B,
27... Drive motor F, 28... Gear A, 29... Gear B. Agent Patent attorney Masaru Nishimoto − −19= ψ l “O r+”+ <D −81

Claims (2)

[Claims] (1) A station that moves along the direction in which the stud bolts are arranged on a pressure vessel in which the pressure vessel body and the top cover are tightened with stud bolts and nuts, and a station that moves on this station in a direction perpendicular to the direction in which the stud bolts are arranged. A mounting trolley that is movably installed and equipped with a bolt cleaning device, a stud tensioner, and a nut attaching/detaching device, and is used for loosening and tightening of stud bolts and nuts, and removing nuts from stud bolts, wherein said mounting trolley is divided into a mounting cart A to which a bolt cleaning device and a stud tensioner are attached and a mounting cart B to which a nut attaching/detaching device is attached, and the mounting cart B moves in a direction perpendicular to the arrangement direction of the stud bolts with reference to the mounting cart A. A pressure vessel opening/closing device characterized in that it can be installed. (2) The opening/closing device for a pressure vessel according to claim (1), wherein the loading truck A and the loading truck B are engaged with each other via gears.