KR20080054877A - Equipment for cleaning and removing the reactor stud bolts and nuts - Google Patents

Abstract

The present invention relates to an apparatus for cleaning and detaching a reactor stud bolt and nut for automatically cleaning and detaching a stud bolt and nut of a nuclear reactor, the apparatus comprising: a rail mounted to be disassembled and assembled in a lower portion of a multi stud expander; A washing and detaching machine which is movably installed on the rail and detaches and cleans the stud bolts and nuts installed in the multi stud extender; And a control unit for automatically or manually controlling the cleaning and detaching device, thereby minimizing the number of workers, reducing the working time, and exposing the radioactive material to the body. And preventing diffusion, protecting workers from chemicals such as cleaning liquids, and increasing the efficiency of stud bolt cleaning, such as increasing the utilization of a workspace in a containment building.

Description

Cleaning, detaching and mounting apparatus of stud bolt and nut for reactor

1 is a view showing a state in which a stud bolt is mounted on a general reactor and a state in which a cleaning device according to the present invention is mounted.

Figure 2 is a schematic diagram showing a device for cleaning and removing the reactor stud bolt and nut according to the present invention.

Figure 3 is a schematic diagram showing an apparatus for transferring the cleaning and demounting device for the reactor stud bolt and nut according to the present invention.

Figure 4 is a side view showing a rail for transporting the cleaning and demounting device for the reactor stud bolt and nut according to the present invention.

5 is a schematic diagram illustrating a desorption unit of the reactor stud bolt and nut according to the present invention.

Figure 6a and 6b is a schematic diagram showing the operating state of the drive chuck and reference chuck provided in the cleaning and demounting device of the reactor stud bolt and nut according to the present invention.

7 shows a seating portion of a reactor stud bolt bottom in accordance with the present invention.

8 is a schematic diagram illustrating a reactor stud nut disassembly assembly according to the present invention.

9A and 9B are schematic diagrams illustrating a reactor stud bolt and nut cleaner in accordance with the present invention.

* Brief description of symbols for the main parts of the drawings *

2: multi stud expander 3: stud bolt

4: nut

100: rail 110: leveling bolt

120: spur gear 200: cleaning and demounting machine

210: driver 212: first motor

214: roller 220: detacher

221: second motor 222: first guide screw

223: first linear moving rail 224: first linear moving bearing

225: third motor 226: drive chuck

226-1: first roller 226-2: first hydraulic cylinder

227: reference chuck 227-1: second roller

227-2: second hydraulic cylinder 228: first seat

228-1: opening 228-2: bearing

230: nut disassembly 231: fourth motor

232: second guide screw 233: second linear moving rail

234: second linear moving bearing 235: fifth motor

236: second seat 236-1: spring lock

237: oilless bearing 238: pneumatic cylinder

240: cleaner 241: first wire brush

241-1: 3rd hydraulic cylinder 242: 2nd wire brush

242-1: 4th hydraulic cylinder 243: 6th motor

244: fifth hydraulic cylinder 245: cleaning liquid tank

300: control unit

The present invention relates to a device for cleaning and detaching a reactor stud bolt and nut, and more particularly, a batch process of automatically removing and cleaning and then remounting a stud bolt and nut for fastening the reactor head of a nuclear power plant in a multi-studd expander. A device for cleaning and demounting reactor stud bolts and nuts that can be performed.

In general, reactor heads are joined by 54 to 58 stud bolts and nuts through a multiple stud tensioner (MST), although there will be some dimensional variation depending on the type of power plant.

The stud bolts and nuts for the nuclear reactor head coupling are stuck with a large number of foreign substances during long time operation of the reactor, and in order to remove such foreign substances, it is necessary to separate and dismantle the stud bolts and nuts at an appropriate time during the operation of the reactor.

In the conventional method for cleaning the stud bolts and nuts, when the stud bolts are removed from the multiple stud expander through a loading vehicle, they are moved to a separate work place using a polar crane disposed around After lying on top, all work is done manually by unscrewing the nuts, cleaning the stud bolts and nuts with a wire brush, and then remounting the stud bolts in the multiple stud stretcher in the reverse order above.

In the above cleaning and demounting operations, the method of receiving and removing the stud bolts using a multi stud extender itself hoist using a bogie placed under the multi stud extender stand, or the motor without a multi stud extender itself hoist In this method, it is possible to use the loaded vehicle to attach and detach it.In this method, there is a risk of overloading of the loaded vehicle due to the large amount of manpower consumed by 4-5 people and the weight of the stud bolt. There was a problem such as being a risk factor.

In addition, there is a risk of falling heavy items (approximately 320 kg) due to the use of the reactor building overhead crane, and the overhead crane work cannot be performed due to stud bolt moving operations. There was a problem of poor efficiency.

In addition, when the stud bolts are laid down or erected on the base, slipping or rolling may cause thread damage, and there is a risk of safety accidents. There was an increasing problem.

In addition, there is a risk of exposure to the body due to radioactive substances scattered during the cleaning of the stud bolt and nut threads and a risk of washing liquid (acetone, etc.) coming into direct contact with an operator, and seizure of the stud bolt occurs due to inefficient cleaning by human personnel There was a latent problem.

As described above, the stud bolt is bulky and heavy, which not only takes up a lot of space, but also is inconvenient to handle, so some nuclear power plants automatically clean only the stud bolt by using equipment. In addition, it often occurred that the stud bolt was not cleaned to an appropriate level.

An object of the present invention for solving the problems as described above, by allowing the reactor head fastening stud bolt and nut of the nuclear power plant to be removed from the multi-stud expander to clean and then re-attach the process to automatically perform a batch process, Minimize the number of workers, reduce the working time much more than before, prevent exposure and diffusion of radioactive material into the body, protect workers from chemicals such as cleaning liquids, The present invention provides a cleaning and demounting device for reactor stud bolts and nuts that increases the utilization of a workspace in a containment building.

In the apparatus for cleaning and detaching the reactor stud bolts and nuts for automatically cleaning and removing the stud bolts and nuts of the reactor according to the embodiment of the present invention for achieving the above object, decomposition in the lower part of the multiple stud expander And a rail mounted to be assembled thereon; A washing and detaching machine which is movably installed on the rail and detaches and cleans the stud bolts and nuts installed in the multi stud extender; And a control unit for automatically or manually controlling the cleaning and detaching device.

According to an embodiment of the present invention, the rail is formed in a T-shape so that the cleaning and detaching device can be precisely positioned without being separated, and are installed on both sides to maintain horizontality through the fastening / unscrewing action of the screw. It is provided with a horizontal adjustment bolt and a spur gear provided on the outer surface in order to ensure that the position can be accurately controlled without the slip and the cleaning and detaching device.

According to an embodiment of the present invention, the cleaning and demounting device includes: a driver for moving the cleaning and demounting device while preventing it from being separated from the rail; A detacher which is moved from the upper part of the rail by the driver and separates and mounts a stud bolt installed in the multi stud expander; A nut disassembling assembly mounted on an upper portion of the cleaning and detaching unit to separate and mount a nut fastened to the stud bolt; And a scrubber for cleaning the separated stud bolts and nuts.

According to an embodiment of the present invention, the driver has a first motor for moving the cleaning and demounting device under control of the control unit, and the shape of the driver to the rail so that the cleaning and demounting device can withstand an earthquake or vibration. It is equipped with the roller fitted.

According to an embodiment of the invention, the demounter, the second motor and the first guide screw to guide the vertical lifting and lowering movement of the stud bolt and to fine-tune in the center "X" axis, and the vertical of the stud bolt A first linear moving rail and a first linear moving bearing for guiding the position to be precisely controlled without being shaken when moving up and down, a third motor operative to rotate the stud bolt, and rotation according to the operation of the third motor And a first roller coated with a polyurethane outer surface, the drive chuck supporting the stud bolt by the action of a first hydraulic cylinder, and simultaneously rotating when the stud bolt is rotated by the first roller. A second chuck coated with plastic, the reference chuck supporting the stud bolt by the action of a second hydraulic cylinder, and the stud The lower part of the bolt is provided with a bearing therein so as to be seated without being restrained, and includes a first seating part having an open part open at one side.

According to an embodiment of the present invention, the nut disassembly assembly, the fourth motor and the second guide screw for guiding the horizontal movement of the nut, and the guide for guiding the position can be precisely controlled without shaking during the horizontal movement of the nut 2 a linear moving rail and a second linear moving bearing, a fifth motor for rotating the nut to be separated, and a second seat having a spring lock so that the nut is seated and has a restraining force only when the nut is rotated. And an oilless bearing provided at the second seating part to assist the rotation of the nut, and a pneumatic cylinder to assist the horizontal movement of the nut.

According to an embodiment of the invention, the pitch of the first guide screw and the second guide screw is 8UN equal to the stud bolt.

According to an embodiment of the present invention, the cleaner includes two first wire brushes for cleaning each of the upper and lower parts of the stud bolt by the operation of a third hydraulic cylinder, and the nut for cleaning the nut by the operation of a fourth hydraulic cylinder. A second wire brush, a sixth motor for rotating the first wire brush and the second wire brush, a fifth hydraulic cylinder for vertically raising and lowering the first wire brush and the second wire brush, a foreign material and a cleaning liquid An air blower for removal and a cleaning liquid tank mounted at the bottom for storing and supplying the cleaning liquid for cleaning the stud bolts and nuts.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the apparatus for cleaning and detaching the reactor stud bolt and nut according to the present invention will be described.

1 is a view illustrating a state in which a stud bolt is mounted on a general reactor and a state in which a cleaning device according to the present invention is mounted, and FIG. 2 is a schematic view showing a cleaning and demounting device of a nuclear reactor stud bolt and nut according to the present invention. Figure 3 is a schematic diagram showing a device for transporting the cleaning and demounting device of the reactor stud bolt and nut according to the present invention, Figure 4 is a rail for transporting the cleaning and demounting device of the reactor stud bolt and nut according to the present invention. 5 is a schematic view showing a detacher of a nuclear reactor stud bolt and nut according to the present invention, and FIGS. 6A and 6B are drivings provided in the apparatus for cleaning and detaching the nuclear reactor stud bolt and nut according to the present invention. Schematic diagram showing the operating state of the chuck and the reference chuck, Figure 7 is a view showing the seating portion of the reactor stud bolt lower according to the present invention, 8 is a schematic view showing a reactor stud nut exploded assembly machine according to the invention, Figures 9a and 9b is a schematic diagram showing a reactor stud bolts and nuts scrubber according to the invention.

Reactor stud bolt according to the present invention for automatically separating, cleaning and remounting the stud bolts 3 and nuts 4 mounted on the multiple stud expanders 2 for fastening the reactor head as shown in FIG. And the nut cleaning and demounting device, as shown in the drawing, is comprised of a rail 100, a cleaning and demounting machine 200, and a control unit 300.

As shown in Figures 2 to 4, the rail 100 is mounted on the lower part of the multiple stud expander 2 so as to be disassembled and assembled, and has a constant track, and accurately positions each of the stud bolts 3. It serves as a base to assign.

The rail 100 is made of a T-shape in order to enable the cleaning and removal device 200 to be precisely positioned without being separated.

Both sides of the lower side of the rail 100 is provided with a horizontal adjustment bolt 110 to be maintained horizontal through the fastening / loosening action of the screw.

In addition, the spur gear 120 is provided on the outer surface of the rail 100 so that the position of the cleaning and removal device 200 can be accurately controlled without slipping.

The cleaning and detachment unit 200 is installed to be movable on the rail 100 to remove and clean the stud bolts 3 and the nuts 4 installed in the multi-stud expander 2, and then serve to re-install. It is composed of a driver 210, a detacher 220, a nut disassembly assembly 230 and a cleaner 240.

The driver 210 as shown in FIG. 3 serves to move the cleaning and demounting device 200 while preventing it from being detached from the rail 100. The first motor 212 and the roller 214 can be moved. ).

The first motor 212 is a power source for moving the cleaning and removal device 200 by the control of the control unit 300, it is possible to precise control.

The roller 214 is fitted to the top of the rail (100) in the shape of the top so that the cleaning and detachment unit 200 to withstand the impact of the earthquake or vibration.

The detacher 220 as shown in FIG. 5 moves from the rail 100 by the driver 210 and serves to separate and mount the stud bolts 3 installed on the multiple stud expanders 2. The second motor 221, the first guide screw 222, the first linear moving rail 223, the first linear moving bearing 224, the third motor 225, the driving chuck 226, and the reference chuck. 227 and the first seating portion 228 are configured.

The second motor 221 guides the vertical raising and lowering movement of the stud bolts 3 and allows the stud bolts 3 to be finely adjusted in the "X" axis at the center.

The second motor 221 is precisely controlled by the control unit 300 through the PLC program so that the position where the stud bolt 3 is seated can be precisely controlled, the stud to be described later The third motor 225 and the fifth motor 235 for rotating the bolt 3 are in communication with each other.

The first guide screw 222 receives the rotational force of the second motor 221 to guide the vertical raising and lowering movement of the stud bolt (3), the stud bolt (3) is fine in the "X" axis from the center Can be adjusted.

Here, the pitch of the first guide screw 222 is formed to be the same 8UN as the stud bolt 3, it is possible to precisely control the movement position of the stud bolt (3).

The first linear moving rail 223 and the first linear moving bearing 224 provided therein serve to guide the position to be precisely controlled without being shaken when the stud bolt 3 vertically moves up and down.

As shown in FIGS. 5, 6A, and 6B, the third motor 225 drives the first roller 226-1 provided in the driving chuck 226 so that the entire thread of the stud bolt 3 is reduced. It is rotated to be cleaned and controlled by the control unit 300.

The driving chuck 226 rotates according to the operation of the third motor 225 as described above, and includes a first roller 226-1 that receives the rotational force to rotate the stud bolt 3.

Here, the first roller 226-1 supports the stud bolt 3 by the action of the first hydraulic cylinder 226-2.

In addition, the third motor 225 not only causes the first roller 226-1 to chuck and clean the stud bolt 3, but also plays a role of assisting in disassembly and assembly of the nut 4.

As shown in FIG. 6B, the first roller 226-1 has a outer surface in order to prevent the thread from being damaged when supporting the stud bolt 3 and to increase friction when the stud bolt 3 rotates. Coated with urethane.

The reference chuck 227 rotates at the same time as the stud bolt 3 rotates by the first roller 226-1, and supports two materials for supporting the smooth rotation and detachment of the stud bolt 3. 2 rollers 227-1 are provided.

Here, the second roller 227-1 supports the stud bolt 3 by the action of the second hydraulic cylinder 227-2.

As shown in FIG. 6B, the second roller 227-1 is coated with a plastic outer surface to prevent the thread from being damaged when supporting the stud bolt 3.

As shown in FIG. 7, the first seating portion 228 has a bearing 228-2 therein so that the lower portion of the stud bolt 3 can be seated without being restrained by force, and one side thereof is opened. The opening 228-1 is provided to allow the second wire brush 242 to come in contact with each other to clean the stud bolt 3.

Thus, the stud bolt 3 can be rotated lightly through the bearing 228-2, and it is possible to completely clean the lower part of the stud bolt 3 through the opening 228-1.

The nut disassembly 230 as shown in FIG. 8 is mounted on top of the cleaning and demounting machine 200 as shown in FIG. 2 to separate the nuts 4 fastened to the stud bolts 3. It serves to mount, the fourth motor 231, the second guide screw 232, the second linear moving rail 233, the second linear moving bearing 234, the third motor 225, the second seating The part 236, the oilless bearing 237, and the pneumatic cylinder 238 are comprised.

The fourth motor 231 operates to drive a second guide screw 232 that guides the horizontal movement of the nut 4.

The fourth motor 231 is precisely controlled by the control unit 300 through the PLC program, so that the position where the nut 4 is moved and seated can be precisely controlled.

The second guide screw 232 receives the rotational force of the fourth motor 231 to guide the horizontal movement of the nut 4, and allows the nut 4 to be finely adjusted from the center to the "X" axis. .

Here, it is preferable that the pitch of the second guide screw 232 is formed to be 8UN so that the stud bolt 3 and the nut 4 are smoothly disassembled and assembled.

The second linear moving rail 233 and the second linear moving bearing 234 provided therein serve to guide the position of the nut 4 to be precisely controlled without shaking when the nut 4 moves horizontally.

When the nut 4 is supported by the spring lock 236-1, the third motor 225 of the detacher 220 is operated to rotate and lower the stud bolt 3 so that the nut 4 is automatically disconnected, or 5 Rotate the nut 4 through the motor 235 so that it can be vertically raised to separate it.

The second mounting part 236 is provided with a spring lock 236-1 to allow the nut 4 to be seated and to have a restraining force only when the nut 4 is rotated.

Accordingly, the spring lock 236-1 does not interfere when the nut 4 is seated, and has a restraining force only when the nut is rotated.

The oilless bearing 237 is provided on the second seating portion 236 to help the rotation of the nut 4 and does not occupy much space.

The pneumatic cylinder 238 serves to assist the horizontal movement of the nut 4, that is, the "X" axis feed, it is not equipped with a working rod to reduce the installation space and weight and improve safety.

As shown in FIGS. 9A and 9B, the cleaner 240 serves to clean the separated stud bolt 3 and the nut 4, and includes a first wire brush 241 and a second wire brush. 242, a sixth motor 243, and a fifth hydraulic cylinder 244.

The first wire brush 241 is composed of two for cleaning each of the upper and lower parts of the stud bolt (3), each of the third hydraulic cylinder (241-1) for driving the first wire brush (241) Equipped.

On the other hand, the front and rear conveying action of the first wire brush 241 is acted by the fifth hydraulic cylinder 244.

The second wire brush 242 cleans the nut 4 by the operation of the fourth hydraulic cylinder 242-1.

In addition, the vertical raising and lowering action of the second wire brush 242 is acted by the fifth hydraulic cylinder 244.

The first wire brushes 241 and the second wire brushes 242 are driven by a plurality of sixth motors 243.

The lower part of the cleaner 240 is provided with a cleaning liquid tank 245 for storing the cleaning liquid for cleaning the stud bolt (3) and the nut (4).

In addition, the cleaner 240 is provided with an air blower (not shown) for cleaning the stud bolts 3 and the nuts 4 and then removing the cleaning liquid from them.

Thus, the air blower allows the cleaning solution on the surface of the stud bolt 3 and the nut 4 to be completely removed and dried.

The control unit 300, as shown in FIG. 2, serves to automatically or manually control the cleaning and removal device 200.

In the control unit 300, the cleaning operation may be automatically performed up to 54 times of the stud bolt 3 by a PLC program.

In addition, the control unit 300 is provided with a function that can be manually operated in preparation for the occurrence of an error of the equipment.

Thus, the operator can clean the stud bolts 3 to 1 to 54 one by one.

Looking briefly at the operating state of the cleaning and demounting device for the stud bolt and nut of the reactor according to the present invention made as described above.

When the cleaning and detachment unit 200 moving on the rail 100 stops at the position of the stud bolt 3 hanging on the multi stud expander 2, the detacher 220 is operated to multi-studd the stud bolt 3. It is separated from the expander (2) and lowered vertically.

The disassembly assembly 230, which is a vertical elevating and rotating device of the nut 4, which is movable in the X-axis and the Y-axis, disassembles the nut 4, and releases the nut 4 above the stud bolt 3. It is fixed by the second seating portion 236 and the spring lock 236-1 of the nut 4, and then reverses (the X-axis movement) to the cleaner 240 of the nut 4.

In this state, the washing machine 240 of the stud bolt 3 has its upper and lower threads, and the nut washing machine 240 has its internal threads driven by the sixth motor 243, respectively. The second wire brush 242 is cleaned.

At this time, the cleaning liquid is automatically supplied from the cleaning liquid tank 245, and the front and rear of the facility are shielded by a transparent window and a blocking film.

The threads of the cleaned stud bolts 3 and the nuts 4 are removed by the air blower to remove foreign substances and washing liquid.

The nut after the air blowing operation is moved to the position of the stud bolt (3) by the nut disassembly assembly 230 moving in the X-axis and then vertically lowered and assembled to the stud bolt (3).

Thereafter, the detacher 220 of the stud bolt 3 advances forward and stops at the position where the stud bolt 3 should be mounted, and then is mounted on the multi stud expander 2.

All of the above operations are automatically performed by the PLC program of the control unit 300, but it is possible to operate semi-automatically and manually.

Although the above has been shown and described with respect to the preferred embodiments of the present invention, the present invention is not limited to the above-described embodiment, in the technical field to which the present invention pertains without departing from the spirit of the invention as claimed in the claims. Various modifications can be made by those skilled in the art, and such changes are within the scope of the appended claims.

According to the cleaning and desorption apparatus of the reactor stud bolt and nut according to the present invention as described above can provide the following effects.

first. Automatically perform all tasks in one place to reduce input manpower and working time.

second. By doing all the work with the stud bolts upright in the installation, the installation itself is compact and the work space can be minimized.

third. This allows the safety hazards associated with human handling of heavy stud bolts to be eliminated.

fourth. There is no stud bolt moving process, so the parallel work is possible, which increases the efficiency of the overhead crane.

fifth. It is possible to check the working status by installing a transparent window and a barrier on the facility, and to prevent scattering of radioactive pollutants and to prevent worker's body exposure.

Sixth. Allows workers to be protected from cleaning fluids

Seventh. Automated cleaning by the facility improves efficiency and eliminates stud bolt fastening factors in advance.

Claims (8)

A device for cleaning and removing a reactor stud bolt and nut for automatically cleaning and removing the stud bolt and nut of the reactor, A rail 100 mounted to be disassembled and assembled at the bottom of the multiple stud expander 2; A washing and detaching device (200) installed on the rail (100) to detach and clean the stud bolt (3) and the nut (4) installed in the multiple stud expander (2), and then remount it; And And a control unit (300) for automatically or manually controlling the cleaning and demounting device (200). The method of claim 1, wherein the rail 100 is formed in a T-shape so that the cleaning and removal device 200 can be precisely positioned without being separated, and is installed on both sides to fasten / unscrew the screw. Horizontal adjustment bolt 110 and horizontal cleaning bolt 110 to maintain the horizontal through the spur gear 120 is provided on the outer surface in order to accurately control the position without slipping occurs without slipping Reactor cleaning and removal of the reactor stud bolt and nut characterized in that it comprises a. The method of claim 1, wherein the cleaning and demounting device 200, A driver (210) to move while preventing the cleaning and detachment (200) from being separated from the rail (100); A detacher 220 which is moved by the driver 210 above the rail 100 and separates and mounts a stud bolt 3 installed in the multi stud expander 2; A nut disassembly assembly unit 230 mounted to an upper portion of the cleaning and detaching unit 200 to separate and mount the nut 4 fastened to the stud bolt 3; And And a scrubber (240) for cleaning the separated stud bolts (3) and the nut (4). The method of claim 3, wherein the driver 210, A first motor 212 for moving the cleaning and demounting machine 200 by the control of the control unit 300, Reactor and stud bolts and nuts, characterized in that the cleaning and removal unit 200 is equipped with a roller 214 fitted in the shape of the rail in order to resist the earthquake or vibration. The method of claim 3, wherein the detacher 220, A second motor 221 and a first guide screw 222 for guiding the vertical lifting and lowering movement of the stud bolt 3 and allowing fine adjustment in the center of the “X” axis; A first linear moving rail 223 and a first linear moving bearing 224 for guiding the position of the stud bolt 3 to be precisely controlled without being shaken during vertical raising and lowering; A third motor 225 operating to rotate the stud bolt 3, The first roller 226-1 is rotated according to the operation of the third motor 225 and the outer surface is coated with polyurethane, and the stud bolt 3 is formed by the action of the first hydraulic cylinder 226-2. A driving chuck 226 for supporting), When the stud bolt 3 is rotated by the first roller 226-1, two stud bolts 227-1 are rotated at the same time and the outer surface thereof is coated with plastic, and the second hydraulic cylinder 227 is provided. A reference chuck 227 for supporting the stud bolt 3 by the action of -2), A first seating portion 228 having a bearing 228-2 therein and having an open portion 228-1 open at one side thereof so that the lower portion of the stud bolt 3 can be seated without being restrained by force. Apparatus for cleaning and removing the reactor stud bolt and nut, characterized in that it comprises a). According to claim 3, The nut disassembly 230 is, A fourth motor 231 and a second guide screw 232 for guiding the horizontal movement of the nut 4; A second linear moving rail 233 and a second linear moving bearing 234 for guiding the position of the nut 4 to be precisely controlled without being shaken during horizontal movement of the nut 4; A fifth motor 235 for rotating the nut 4 to be separated; A second seating portion 236 having a spring lock 236-1 on which the nut 4 is seated, and having a restraining force only when the nut 4 is rotated; An oilless bearing 237 provided at the second seating part 236 to assist rotation of the nut 4; Reactor and stud bolts and nuts, characterized in that it comprises a pneumatic cylinder (238) to help the horizontal movement of the nut (4). 7. The cleaning of the reactor stud bolts and nuts according to claim 5 or 6, characterized in that the pitch of the first guide screw 222 and the second guide screw 232 is 8UN equal to the stud bolt 3. And a detachment device. The method of claim 1, wherein the cleaner 240, Two first wire brushes 241 for cleaning each of the upper and lower portions of the stud bolt 3 by the operation of the third hydraulic cylinder 241-1, A second wire brush 242 for cleaning the nut 4 by operation of a fourth hydraulic cylinder 242-1, A plurality of sixth motors 243 for rotating the first wire brushes 241 and the second wire brushes 242, Two fifth hydraulic cylinders 244 for raising and lowering the first wire brush 241 and the second wire brush 242 vertically; An air blower to remove foreign substances and cleaning liquid, And a cleaning liquid tank (245) mounted at the bottom for storing and supplying the cleaning liquid for cleaning the stud bolt (3) and the nut (4).

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