JPH0797145B2 - Top lid opening / closing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION “Industrial field of application” The present invention, for example, in a reactor pressure vessel, uses a stud bolt or a nut to fasten a ring-shaped flange portion where the vessel upper lid and body are mutually mutual. The present invention relates to an upper lid opening / closing device used for attaching / detaching the upper lid when connected by, and more specifically, to an improvement of an upper lid opening / closing device having a plurality of working units for attaching / detaching the stud bolts or nuts. It is a thing.

"Prior Art" For example, an upper lid of a reactor pressure vessel in a boiling water reactor is fixed to a body using a stud bolt as a connecting means.

FIG. 10 shows a conventional example of the reactor pressure vessel. In the figure, reference symbol A is the reactor pressure vessel, B is the body of the reactor pressure vessel A, C is the upper lid, and F is the stud. It is a bolt.

The body portion B and the upper lid C are provided with flange portions D and E for connecting to each other with the stud bolts F. Further, in the upper lid C, a metal fitting for hanging (hanging metal fitting) on the middle of the outer surface thereof. Ca is projected.

As shown in FIG. 11, the stud bolt F is formed with screw parts Fa and Fb at positions near the lower end and the upper part, and is used for a stud tensioner (a device for grasping and pulling one end of the stud bolt) at the upper end. By forming the grip portion Fc, by screwing the screw portion Fa at the lower end to the flange portion D of the body portion B, and tightening the nut G screwed to the screw portion Fb near the upper portion via the washer H, Upper cover C to body B
Fixed to. A large number (eg, 92) of such stud bolts F are provided at equal intervals on the entire circumference of the upper cover C.

By the way, the upper lid C of the reactor pressure vessel is removed from the body B at the time of fuel rod replacement or regular inspection after the start of the reactor operation.

The opening / closing operation of the upper lid C in that case is performed by, for example, FIGS.
The procedure is as shown in the figure.

That is, first, as shown in FIG. 12, the nut G and washer H screwed onto the upper portion of the stud bolt F are removed, and then a clean (not shown) is used to remove the upper lid C as shown in FIG.
Is lifted and pulled out from the stud bolt F, and the upper lid C is moved to a predetermined storage place. The nut G
Before and after attaching / detaching, the exposed portion of the screw part is cleaned with a brush or the like to prevent the nut G from being galled at the time of attachment / detachment, and the stud bolt F is pulled upward by the stud tensioner. .

Next, as shown in FIG. 14, the stud bolts F protruding above the body B are taken out and moved to a predetermined storage place in the same manner as the upper cover C, and no extra parts are attached to the body B. Then, perform the initial refueling work or inspection work.

When attaching the upper lid C, the work is performed in the reverse order of the removal.

By the way, the upper lid C and the body portion B are connected to each other by the stud bolts F at 92 places as a whole of the upper lid C. Moreover, although the stud bolts F and nuts G vary depending on the size of the pressure vessel, they are generally quite large and heavy (for example, a stud bolt F having a length of about 1.8 m is
(Weighs 250 kg), and since the work of attaching and detaching the stud bolts F and nuts G is all performed within the radiation control area, it simplifies and automates the work, shortening the construction period and It is required to reduce the radiation exposure of workers.

The applicant has so far proposed, in order to meet the above requirements, JP-B-58-17737 [stud bolt attaching / detaching device] and JP-B-59-11433 [nut attaching / detaching work equipment]. In addition, labor has been reduced in the work of attaching and detaching nuts, the construction period has been shortened, and the radiation exposure of workers has been reduced.

"Problems to be Solved by the Invention" By the way, there is a very difficult problem in manufacturing an upper lid opening / closing device in which attachment / detachment of stud bolts F and nuts G is automated.

This is because the number of stud bolts F and nuts G used to connect the body B of the reactor pressure vessel and the upper lid C is 92 in the entire upper lid, as described above. If it is attempted to attach and detach the bolts F and nuts G in a shorter time, work units, which are devices for automatically attaching and detaching the stud bolts F and nuts G, are installed at multiple locations, and are simultaneously installed at multiple locations. It may be activated.

However, since the bolts and nuts used in the reactor pressure vessel are more reliable in fastening performance, the stud bolts F and nuts G may interfere with surrounding equipment or the working unit during the attachment / detachment work. Stud bolt F
Avoid the inconvenience of damaging the screw part of the nut and nut G, and use all the screws that are used in the same combination and at the same position as before the upper lid attaching / detaching work, that is, remove it. It is required that the stud bolt F and the nut G are always attached in their original positions.

Therefore, as described above, when the work units are provided at a plurality of positions in order to reduce the time required for the attachment / detachment process of the stud bolt F or the nut G, naturally, these work units are not suitable for the attachment / detachment work. Precisely align the stud bolts F and nuts G with the positions of the stud bolts F and nuts G so that they do not interfere with the threaded parts of the stud bolts F and nuts G.
However, in order to meet such demands,
The configuration of the device for positioning (hereinafter referred to as the centering device) becomes complicated, the device becomes very expensive, or careful position adjustment is required for each work unit.
There is a possibility that problems such as lengthening the time required for position adjustment may occur.

The present invention has been made in view of the above circumstances, and is provided with work units for attaching and detaching stud bolts and nuts at a plurality of locations, and these work units automate attachment and detachment of stud bolts and nuts to shorten the construction period. In the upper lid opening / closing device, multiple working units can be collectively aligned accurately with the positions of stud bolts and nuts, the time required for centering work can be shortened, and the configurations can be compared. It is an object of the present invention to provide an upper lid opening / closing device that can be simply simplified to reduce the manufacturing cost.

"Means for Solving Problems" An upper lid opening / closing device according to the present invention is made by fastening a flange portion formed in a ring shape at mutual end portions of a top lid and a body portion to each other with a stud bolt and a nut. An upper lid opening / closing device comprising a plurality of working units for attaching and detaching the stud bolts and nuts for attaching and detaching the upper lid of the container, wherein a fixed sling fixed on the upper lid and a horizontal plane on the fixed sling. And a swivel table that is rotatably held by the swivel table, and a plurality of swivel tables that are supported by the swivel table so that they are located at a plurality of locations with the same distance to the center of the swivel table, and that attach and detach the stud bolts and nuts, respectively Working unit, a table position adjusting device for horizontally moving the turning table with respect to the fixed sling, and a support for the turning table. A position detection device that is held and detects a relative position with respect to the upper lid, and a position adjustment that operates the position adjustment device so that the center position of the turning table matches the center position of the upper lid by an output signal from the position detection device. And a control device.

[Operation] In the upper lid opening / closing device according to the present invention, the plurality of working units for attaching and detaching the stud bolts and nuts are respectively located on the concentric circles with respect to the center of the turning table, and move the turning table itself. As a result, it is possible to collectively adjust the positions of the plurality of work units while maintaining the relative positional relationship between the units. If the swivel table is moved by the table position adjusting device based on the detection signal of the position detection device so that the center of the swivel table coincides with the center of the upper lid, the center of the upper lid can be collectively operated by a plurality of working units. Can be aligned with respect to, and can be aligned with the positions of stud bolts and nuts arranged concentrically with respect to the center of the upper lid. Therefore, when the upper lid opening / closing device is attached to the upper lid, the time required for centering work of the working unit can be shortened.

Further, since the turning table has a fixed position in the vertical direction and is moved only in the horizontal direction, the position adjusting device for adjusting the position of the turning table also expands and contracts using, for example, a hydraulic cylinder. A relatively simple mechanism such as connecting the swivel table and the fixed sling with the enabled position adjusting arm can be used, and the structure can be simplified and the manufacturing cost can be reduced.

In addition, the position detection device has the same distance to the center of the revolving table, and the sensors are arranged at positions facing each other across the center of the revolving table, and these sensors measure the distance to the stud bolt at the nearest position. For example, when the detection signal of each sensor indicates a position shift, if the turning table is turned within an appropriate range of one rotation or less while continuing the position detection, the signals are arranged in concentric circles. The amount of eccentricity of the turning table with respect to the stud bolts, that is, the displacement of the position of the turning table can be grasped as a whole, and the position of the turning table can be adjusted more accurately and quickly.

"Embodiment" FIGS. 1 to 3 show an embodiment of an upper lid opening / closing device according to the present invention.

In these drawings, reference numeral 1 is an upper lid opening / closing device.

This upper lid opening / closing device 1 automates the attachment / detachment of the stud bolts F, nuts G, and washers H that connect the upper lid C and the body B when the upper lid C of the reactor pressure vessel A is attached / detached from the body B. Fixed sling 2 fixed to the upper lid C,
The turning table 3 that is turnably held by the fixed sling 2 and a scaffolding device 4 for work are used as a basic configuration.

The fixed sling 2 is fixed to the upper lid C by connecting a leg 2b hanging from the end of the frame 2a of the fixed sling 2 to a hanging metal Ca of the upper lid C by a pin P. The legs 2b are arranged at three or more places to rigidly connect the fixed sling 2 to the upper cover C, and the length thereof can be adjusted by a known means.

At the center of the frame 2a of the fixed sling 2, a hanging metal fitting 2c for hanging by a crane (not shown) is provided. The hanging metal fitting 2c, the frame 2a, and the like have strength enough to support the weight of the upper lid C and the turntable 3, and if the upper lid C is separated from the body B, the hanging metal fitting 2c can be used by a crane. By lifting, the upper lid C can be moved together with the upper lid opening / closing device 1. In addition, on the upper surface of the fixed sling 2, the first
As shown in the figure, the checker plate J is stretched so that the worker can stand up and the gap between the turntable 3 and the operator can be eliminated.

As shown in FIG. 4, the revolving table 3 is in the shape of a donut having an opening for inserting the hanging metal fitting 2c of the fixed sling 2 formed in the center thereof. Placed on the installed roller 5,
Vertical positioning is done. As shown in FIG. 4, a rail portion 3a having a smooth contact surface with the roller 5 is formed at a portion of the revolving table 3 which is in contact with the roller 5, so that the fixed sling 2 can be swung freely. It has been supported by. Also, a checker plate 3b is stretched on the upper surface of the revolving table 3 as in the case of the fixed sling 2, and as shown in FIG.
An operation panel 3c for operating the upper lid opening / closing device 1 is arranged.

The scaffolding device 4 provides a scaffold around which the operator can pass around the upper cover C, but as can be understood from FIGS. 1 to 4, each stud bolt fixing the upper cover C. Corresponding to the position of F, pins 6 that can be inserted into the nut G and the washer H are projected upward, and the nut G and the washer H removed from the upper cover C can be fitted into these pins 6. It is considered that it can be used as a storage place for the nut G and the washer H. This scaffolding device 4 is in the form of a ring that goes around the outer periphery of the flange portion E of the upper lid C as a whole, and the lower surface on the outer peripheral side is placed on the structural portion (bulkhead or the like) T of the reactor containment vessel. It is supported, and a checker plate 4a is stretched on the upper surface portion.

Further, as shown in FIG. 2 to FIG. 4, the fixed sling 2 is provided with a drive unit 8 for turning the turning table 3.
A table position adjusting device (hereinafter referred to as a centering device) 9 for moving the turning table 3 in a horizontal plane in order to match the center position of the turning table 3 with the center position of the upper cover C is provided.

As shown in FIGS. 2 to 4, the drive unit 8 includes a drive motor 10 supported by the fixed sling 2 and the motor 10.
A pinion 11 fixed to the output shaft of 10 and a ring-shaped gear 12 fixed to the turning table 3 side and having teeth engaging with the pinion 11 are provided, and the pinion 11 is driven by the motor 10. By rotating
The turning table 3 is turned in the rotation direction of the pinion 11.

In the centering device 9, as shown in FIGS. 2 to 4, the annular inner peripheral surface of the revolving table 3 is used as a reference surface 9a, and the position of the roller 15 brought into contact with the reference surface 9a is set to the table. The position of the turntable 3 is corrected by moving the turntable 3 in the radial direction. In this embodiment, the rollers 15 are arranged at four locations, and each roller 15 is supported by the tip of an arm 16 which is capable of expanding and contracting in the radial direction. And arm 16
As shown in FIG. 3, in this embodiment, a fixed arm 16a having a tip fixed to the fixed sling 2, a middle portion pivotally supported by the tip of the fixed arm 16a, and the roller 15 at one end is It is provided with a lever type link 16b attached, and a hydraulic cylinder 16c for connecting the other end of the link 16b and the fixed arm 16a to expand and contract to displace the roller 15 in the radial direction of the tape 3. . Further, the link 16b also functions as a support base for the motor 10.

The position correction operation of the turning table 3 by the centering device 9 is performed by a position adjustment control device (not shown) based on detection data of a position detecting device for the turning table 3 described later.

As shown in FIG. 2, the turning table 3 as described above,
The work unit 19 for attaching and detaching the stud bolt F, the nut G, the washer H, and the like, and the position of the turning table 3 for setting the operation of the centering device 9 are detected, and the detected data is detected. A position detecting device 20 for sending to the control device of the centering device 9 and a scaffold holding device 21 for holding the scaffolding device 4 until the scaffolding device 4 is set at a predetermined position with respect to the upper cover C. It is equipped.

As shown in FIG. 5, the working unit 19 is equipped with a unit lifting device 23 installed on the turntable 3, a unit platform 24 that is vertically operated by the lifting device 23, and the unit platform 24. It is composed of three working devices, and is arranged at four places which are concentric with the center of the table 3. One of the above-mentioned three working devices is a stud tensioner 25, the other one is a stud bolt attaching / detaching device 26, and the other one is a nut conveying device 27.

The stud tensioner 25 has a function of gripping and pulling up the grip portion Fc of the stud bolt F, and a function of turning the nut G to remove it from the stud bolt F. It is based on the 141478 gazette.

The stud bolt attaching / detaching device 26 uses the screw hole Fo formed from the upper end of the stud bolt F along the central axis to screw or remove the stud bolt F. The basic configuration is
This is based on the official gazette of Japanese Utility Model Publication 58-17737.

The nut transfer device 27 grips the nut G and the washer H removed from the stud bolt F by the stud tensioner 25 with the grip bracket 29 (see FIG. 5), and moves the stud bolt F to the pin 6 of the scaffolding device 4. Similarly, the nut G and the washer H stored on the pin 6 or stored in the pin 6 are transferred to the stud bolt F by the grip bracket 29. The gripping bracket 29 has a vertically elevating mechanism 29a and a radially elevating mechanism 29b so that it can freely move between the stud bolt F and the pin 6. The tip of the grip bracket 29 has a structure suitable for gripping the nut G and the washer H. That is, the tip portion 29c of the gripping bracket 29 has a fork shape having a groove through which the stud bolt F is inserted, and the nut G
Insert the fork-shaped part on the underside of the bracket 29
The nut G can be pulled out from the stud bolt F by raising. Further, a magnet is embedded in the lower surface of the fork-shaped portion of the bracket 29, and if the fork-shaped portion is inserted between the nut G and the washer H, the washer H can be attracted by the magnet.

As shown in FIG. 4, the position detecting device 20 is provided with a sensor S for detecting the distance to the stud bolt F at a position of a predetermined radius from the center of the revolving table 3 and detecting the distance from the detected distance. The position shift with respect to the fixed sling 2 connected to the upper end C of the turning table 3 is detected.
Mounting radius R of the sensor S on the turntable 3
As shown in FIG. 6, that the radius of the pitch circle of the stud bolt F plus the distance δ to the radius r and the reference of the stud bolts F in R _1, i.e., R = R ₁
It is set to + r + δ.

A plurality of such position detecting devices 20 are arranged on the circumference of the radius R so as to face each other with the center of the table 3 interposed therebetween, and the detection signals from the respective sensors S are compared and examined. By observing the change of the detection value from each sensor S by appropriately rotating the table 3 while performing the detection, the eccentric amount with respect to the fixed sling 2 connected to the upper lid C of the table 3 as a whole can be easily and You can know exactly. In addition, as the sensor S,
Optical, magnetic, mechanical, etc. may be appropriately adopted.

The scaffold holding device 21 supports the scaffolding device 4 until the work of installing the scaffolding device 4 on the structural part T of the reactor containment vessel A is completed. A lifting device such as a chain block is used so that it can be removed.

Now, the operation of the upper lid opening / closing device 1 will be described.

First, the case of removing the upper lid C will be described. First, the entire upper lid opening / closing device 1 is lifted using a crane or the like,
Install on top lid C.

In the installation of the opening / closing device 1, first, the fixed sling 2 is fixed to the upper lid C, and then the centering work of aligning the center of the turning table 3 with the center of the bolt pitch circle is performed.
This centering operation can be automatically performed by operating the above-mentioned centering device 9. Then, when the centering work is completed, the scaffolding device 4 is installed on the structural part T of the reactor containment vessel A.

After the installation of the scaffolding device 4 is completed, the scaffolding holding device 21
Is removed from the turning table 3 so as not to interfere with the subsequent work.

After the setting of the upper lid opening / closing device 1 is completed, next, the working unit 19 is operated to disengage the stud bolt F from the body portion B of the reactor pressure vessel A.

As a concrete procedure in this case, first, the grip portion Fc of the stud bolt F is raised by the stud tensioner 25, and then the nut G is loosened.

When the nut G and the stud bolt F are completely unscrewed, the nut transfer device 27 is actuated and the nut G
And the washer H is replaced with the pin 6 on the scaffolding device 4 and stored. The work of removing the nut G and the washer H is carried out by rotating the table 3 by one pitch of the stud bolts F arranged side by side.
Since it is provided in four places in total, the table 3 itself
All nuts G and washers H can be removed by turning 1/4 turn.

Then, when the removal of all the nuts G and washers H is completed, the number of stud bolts F that are considered to be necessary next
Is removed, and then the upper lid C is lifted. In that case, the fixed sling 2 of the upper lid opening / closing device 1 is lifted by a crane or the like, and the upper lid C and the upper lid opening / closing device 1 are
And will be transported to the operation floor that is secured as a storage location for one job.

When attaching the removed upper lid C, the above procedure is performed in reverse.

As is clear from the above description, in the upper lid opening / closing device 1, the plurality of work units 19 for attaching and detaching the stud bolts F and the nuts G are located concentrically with respect to the center of the revolving table 3, respectively. Therefore, by moving the revolving table 3 itself, it is possible to collectively adjust the positions of the plurality of work units 19 while maintaining the relative positional relationship between the units. Therefore, if the turning table 3 is moved by the table position adjusting device 9 based on the detection signal of the position detecting device 20 so that the center of the turning table 3 coincides with the center of the bolt pitch circle, a plurality of operations can be performed. The unit 19 can be collectively positioned with respect to the center of the bolt pitch circle,
The position of the stud bolt F or the nut G arranged concentrically with respect to the center of the upper lid C can be aligned.

Therefore, when the upper lid opening / closing device 1 is attached to the upper lid C, the time required for the centering work of the working unit 19 can be shortened.

Further, since the turning table 3 has a fixed position in the vertical direction and is moved only in the horizontal direction, the position adjusting device 9 for adjusting the position of the turning table 3 also uses, for example, a hydraulic cylinder or the like. A relatively simple mechanism, such as connecting the swivel table 3 and the fixed sling 2 with a position adjusting arm 16 that can be expanded and contracted, can be used, and the structure can be simplified and the manufacturing cost can be reduced.

Further, in the position detecting device 20, the sensors S are arranged at positions where the distances to the center of the turning table 3 are equal and are opposed to each other across the center of the turning table 3, and the sensors S are located at the nearest position. If the distance to the bolt F is detected, for example, when the detection signal of each sensor S indicates a position shift, the turning table 3 is turned within an appropriate range of one rotation or less while continuing the position detection. Thus, the eccentric amount of the turning table 3, that is, the displacement of the position of the turning table 3 with respect to the stud bolts F arranged on the concentric circles can be grasped as a whole, and the position adjustment of the turning table 3 can be more accurately performed. It can be done quickly.

The position of the turning table 3 may be adjusted by using a position adjusting mechanism as shown in FIG. 7 or 8 instead of using the centering device 9 described above.

In FIG. 7, a positioning jig 31 that fits into the stud bolt F is placed on the periphery of the revolving table 3 concentrically with respect to the center of the table 3 so as to hang down. As shown in the figure, the jig 31 is provided with a taper portion 31a whose diameter is gradually widened on the lower end side, and the mounting diameter D of each jig 31 matches the diameter D ₁ of the pitch circle of the stud bolt F. In addition, the maximum diameter of the tapered portion 31a is set so as to allow the maximum dimensional error δ ₁ that occurs during mounting.

Further, as shown in FIG. 8, the jig 32 for hanging from the revolving table 3 is formed in a straight tube shape, and the stud bolt F side is covered with a jig 33 having a tapered portion 33a. Is.

Further, in the above-described embodiment, the arm 16 of the centering device 9 is used.
In the above, the link 16b is used, but the structure shown in FIG. 9 may be used.

In FIG. 9, two rollers 15 are supported by a tip of a moving arm 16d, which is guided by a fixed arm 16a so as to be able to move straight forward and backward in a radial direction, via a support plate 16e. The operation itself uses a hydraulic cylinder or the like as in the first embodiment.

Further, the upper lid opening / closing device of the one embodiment was for the reactor pressure vessel, but the device according to the present invention can be used regardless of the reactor pressure vessel as long as it is a vessel having a similar connection structure. Needless to say.

[Advantages of the Invention] In the upper lid opening / closing device according to the present invention, a plurality of working units for attaching and detaching stud bolts and nuts are respectively located on concentric circles with respect to the center of the turning table,
By moving the revolving table itself, it is possible to collectively adjust the positions of the plurality of work units while maintaining the relative positional relationship between the units. Therefore, if the turning table is moved by the table position adjusting device based on the detection signal of the position detecting device so that the center of the turning table coincides with the center of the bolt pitch circle, a plurality of working units can be integrated. Can be aligned with the center of the bolt pitch circle, and can be aligned with the positions of stud bolts and nuts arranged concentrically with the center of the upper lid.

Therefore, when attaching the top lid opening / closing device to the top lid,
The time required for centering work unit can be shortened.

Further, since the turning table has a fixed position in the vertical direction and is moved only in the horizontal direction, the position adjusting device for adjusting the position of the turning table also expands and contracts using, for example, a hydraulic cylinder. A relatively simple mechanism such as connecting the swivel table and the fixed sling with the enabled position adjusting arm can be used, and the structure can be simplified and the manufacturing cost can be reduced.

In addition, the position detecting device is provided with sensors at positions where the distance to the center of the turning table is equal and which oppose each other across the center of the turning table, and these sensors measure the distance to the stud bolt at the nearest position. For example, when the detection signal of each sensor indicates a position shift, if the turning table is turned within an appropriate range of one rotation or less while continuing the position detection, the signals are arranged in concentric circles. The amount of eccentricity of the turning table with respect to the stud bolts, that is, the displacement of the position of the turning table can be grasped as a whole, and the position of the turning table can be adjusted more accurately and quickly.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of an upper lid opening / closing device according to the present invention, FIG. 2 is a front view of the same embodiment, FIG. 3 is a plan view of the same embodiment, and FIG. FIG. 5 is an enlarged view of a part, FIG. 5 is a perspective view of a main part of the embodiment, FIG. 6 is a detailed explanatory view of the position detecting device shown in FIG. 4, and FIGS. 7 and 8 are position adjusting devices, respectively. 9 is a plan view of still another embodiment of the upper lid opening / closing device according to the present invention, FIG.
FIG. 11 is a side sectional view of a reactor pressure vessel, FIG. 11 is an enlarged view of a main part in FIG. 10, and FIGS. 12 to 14 are process explanatory views of a conventional attachment / detachment method. A ... Reactor pressure vessel, B ... Body, C ... Top, Ca ... Suspension fitting, E ... Flange, F ... Stud bolt, Fa ... Screw, Fb ... Screw, Fc ...... Grip, G ... Nut, H ... Washer, 1 ... Top lid opening / closing device, 2 ... Fixed sling, 3 ... Swivel table, 4 ... Scaffolding device, 5 ... Roller, 6 ... Pin, 8 ... Drive unit, 9 ... Centering device, 10 ... Motor, 11 ... Pinion, 12 ... Rack, 15 ... Roller, 16 ... Arm, 19 ... Working unit, 20 ... Position detection device , 21 …… Scaffold support device, 23 …… Unit lifting device, 24 …… Unit stand, 25 …… Stud tensioner, 26 …… Stud bolt attaching / detaching device, 27 …… Nut transfer device, 29 …… Grip bracket, 30… … Spacer, 31 …… Main body, 32 …… Handle, 33 …… Hinge, 34 …… Mounting fitting, 35 …… Lock metal Tool, 37 …… Spacer, 38 …… Coupling plate, 39 …… Screw member.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yutaka Omura Yutaka Omura No. 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishi Kawashima Harima Heavy Industries Co., Ltd. Yokohama No. 1 Factory (56) Reference JP 60-243594 (JP, A) JP 59-97849 (JP, A) JP 60-238793 (JP, A)

Claims (3)

[Claims] 1. The stud bolt for attaching and detaching the upper lid of a container, wherein the coupling between the upper lid and the body is made by tightening flange portions formed in a ring shape at mutual ends with stud bolts and nuts. An upper lid opening / closing device having a plurality of work units for attaching and detaching nuts and nuts,
A fixed sling fixed on the upper lid, a turning table held by the fixed sling so as to be turnable in a horizontal plane, and supported on the turning table so that the turning table is located at a plurality of positions at equal distances to the center of the turning table. A plurality of working units for respectively mounting / demounting / transporting the stud bolts and nuts, and a table position adjusting device for horizontally moving the turning table with respect to the fixed sling,
A position detecting device that is supported by the turning table and detects a relative position with respect to the upper lid, and the position adjusting device that adjusts the center position of the turning table to the center position of the upper lid by an output signal from the position detecting device. An upper lid opening / closing device, comprising: a position adjustment control device for operating. 2. The position adjusting device abuts on a reference surface which is formed inwardly on the turning table so that the center of the turning table serves as a center of curvature and forms an annular shape in a horizontal plane. The plurality of rollers and a position adjusting arm that horizontally extends from a fixed sling to support these rollers and that is capable of expanding and contracting the supported rollers in the horizontal direction are provided. The upper lid opening / closing device according to claim 1, wherein the amount of advance / retreat of the position adjusting arm is adjusted by an output signal from the device. 3. The position detecting devices are respectively provided at positions having the same distance to the center of the turning table and facing each other with the center of the turning table interposed therebetween, and each of them is connected to a stud bolt located at the nearest position. The upper lid opening / closing device according to claim 1, further comprising a sensor for detecting a distance.