KR102684247B1 - System For Laser Shock Peening - Google Patents

Abstract

A laser peening system for maintaining the integrity of spent nuclear fuel storage containers is introduced. The laser peening system uses cable carriers to move the mobile truck. The transfer rail is installed through the upper vent of the outer shell, and its front end passes the first edge of the inner shell and spans the second edge on the radially opposite side of the first edge. The mobile cart moves along the transport rail by a cable chain and is inserted into the gap between the inner shell and the outer shell at the second edge.

Description

Laser peening system {System For Laser Shock Peening}

The present invention relates to a laser peening system for maintaining the integrity of radioactive waste, especially spent nuclear fuel storage containers.

Spent nuclear fuel refers to fuel that is discharged to the outside after being loaded and used in the reactor of a nuclear power plant. The spent nuclear fuel withdrawn from the reactor not only has fissile material remaining, making it recyclable, but also emits high levels of radioactivity and heat for a long period of time, so the spent nuclear fuel within the power plant is cooled and stored in underwater storage tanks for decades.

While the operation period of a nuclear power plant is approximately 40 to 60 years, the capacity of the storage tank within the power plant at the time of construction was designed for a shorter period of approximately 10 to 20 years. In order to store spent nuclear fuel generated during the operation of a power plant, the storage rack in the storage tank must be replaced with a compact rack, or it must be moved and stored in a storage tank at an adjacent power plant that has room for storage.

The final management plan for spent nuclear fuel includes reprocessing and recycling and permanent disposal. Reprocessing is a desirable alternative in terms of resource utilization and high-level waste reduction, but there is not much demand for reprocessing in Korea due to concerns about nuclear proliferation, delays in commercialization of fast breeder reactors, and economic issues due to stabilization of uranium prices.

The basic principle for permanent disposal of spent nuclear fuel is deep disposal at a depth of approximately 500 to 1,000 m underground, but feasibility studies on deep seabed disposal have recently been conducted. Which management method to adopt is very complex, as it must take into account not only domestic considerations such as energy policy, economic feasibility, and environmental issues, but also political and diplomatic factors related to nuclear proliferation.

As the final management plan for spent nuclear fuel is delayed, the storage tanks of operating nuclear power plants approach saturation, and the decommissioning period of nuclear power plants that have reached the end of their lifespan approaches, disposal of spent nuclear fuel is emerging as a major issue. Currently, most countries are adopting a plan to collect and store fuel temporarily stored in storage tanks within power plants in one place as an intermediate step before reprocessing or permanent disposal (interim storage).

Intermediate storage methods for spent nuclear fuel include wet storage and dry storage. Until the mid-1980s, wet storage, which had abundant empirical experience, was mainly adopted, but there was a burden on continuous management such as circulation of cooling water. In the 1990s, dry storage methods, which are advantageous in terms of expansion of storage capacity and long-term management, began to be adopted, and dry storage facilities are currently operated in many countries around the world.

Spent nuclear fuel can be managed in storage tanks within power plants through procedures of temporary storage, intermediate storage, reprocessing, or permanent disposal. When moving to an intermediate storage facility after temporary storage, for example, a canister loaded with spent nuclear fuel is moved to a dry storage facility using a transport container. In a dry storage facility, the canister is taken out of the transport container and placed in a concrete cask using a transport container. Transfer it.

Canisters used for dry storage are made of austenitic stainless steel such as SUS304 and SUS316. Although stainless steel is resistant to corrosion, contact with moisture, chloride, and elements present in the air over several decades threatens its health. A representative example is stress corrosion cracking of stainless steel due to chloride penetration. Additionally, since the canister is manufactured by bending and welding stainless steel plates, stress corrosion cracking due to residual stress in the weld zone, especially in the heat-affected zone of the weld, is a problem. A maintenance plan is required to maintain the integrity of the canister, especially the welded area, during use when access is difficult due to the risk of radiation exposure.

Figure 1 is a partial cutaway view of a container for storing spent nuclear fuel.

As shown in Figure 1, the spent nuclear fuel storage vessel consists of an internal canister (1), an external cask, and a top cover (3). Spent nuclear fuel generates decay heat for a long period of time, and storage containers are designed to dissipate the decay heat through natural air convection. There is a radial gap of approximately 50 mm, for example, between the canister (1) and the cask (2), and the inner wall of the cask (2) has a protruding rib to ensure the separation between the canister (1) and the cask (2). A shaped guide channel (8) extends vertically. An air inlet is provided from the bottom of the cask (2), and an outlet is provided at the top.

The canister 1 is manufactured by welding several segments and has several weld lines 9 in the vertical and horizontal directions. These weld lines (9) are at risk of stress corrosion cracking due to residual stress. If a crack has occurred through investigation of the inside of the storage container, appropriate repair measures must be prepared. If the crack has not yet reached the level of becoming a problem due to stress corrosion cracking, a method of relieving residual stress in the weld zone may be considered. .

There is a risk of radiation exposure inside the storage container, so worker access is restricted. In order to inspect and maintain the health of the canister (1), a robot must enter the storage container through remote control. However, as can be seen from the shape of the welding lines (9), vertical climbing is required, and the passage for the robot to move is very narrow and movement is limited. The use of electronic devices or circuits sensitive to radiation is limited, and there are many difficulties that have not been experienced, such as how to insert a robot into the gap between the canister (1) and the cask (2) to perform repairs. In particular, unlike simple investigation, in the case of repair, the equipment and various cables to perform the repair are mounted on the robot, so there are difficulties in designing the robot as well as entering the storage container and designing the movement route.

Hangu Patent Publication No. 2002-0053742 introduces an airtight container and storage facility containing radioactive materials.

The present invention is based on the recognition of the above prior arts, and seeks to provide a system for performing repair work, especially laser peening, necessary to maintain the integrity of welds of radioactive waste storage containers, for example, canisters.

In addition, the present invention provides a system for allowing a mobile truck to smoothly enter and move into the narrow passage of a radioactive waste storage container, especially the vertical passage between the canister and the cask, and to perform laser peening on the outer wall of the canister by being fixed in position. We would like to provide

The problems to be solved by the present invention are not necessarily limited to the matters mentioned above, and other problems not yet mentioned may also be understood by the matters described below.

The above objectives are achieved by the inventions and configurations described in the claims. The laser peening system according to the present invention is configured to use a cableveyor so that a mobile truck can stably enter the narrow vertical passage of a storage container and perform movement and laser peening operations.

The laser peening system according to the present invention includes a mobile cart; And a transfer guide including a transfer rail for moving the mobile cart, a cable chain connected to the mobile cart, and a feeding module for moving the cable chain forward and backward along the transfer rail. The transfer rail is installed through the upper vent of the outer shell of the storage container, and its front end passes the first edge of the inner shell and spans the second edge on the radially opposite side of the first edge. The laser peening system is configured so that the mobile cart moves along the transport rail by a cable chain and can be inserted into the gap between the inner shell and the outer shell at the second edge.

According to an embodiment of the present invention, the curvature of the path through which the mobile cart enters the gap at the front end of the transfer rail is configured to be adjusted according to the entry position of the mobile cart.

According to a specific example of the present invention, a curved bracket is connected to the front end of the transfer rail. The laser peening system is configured so that the path through which the mobile truck enters the gap at the front end of the transfer rail is gently bent downward by a curved bracket.

According to a specific example of the present invention, the front end of the transfer rail is connected to the rear end of the curved bracket. The laser peening system is configured so that the rear end of the curved bracket can be lifted depending on the position where the mobile truck enters the gap at the front end of the transfer rail.

According to an embodiment of the present invention, a cover is installed on the transfer rail to limit the upward movement of the cable chain.

According to a specific example of the present invention, the mobile cart is provided with a supporting element capable of being lifted up so as to support its own weight by frictional force with the outer wall surface of the outer shell when moving vertically in the gap between the inner shell and the outer shell.

According to the present invention as described above, repair work necessary to maintain the soundness of a radioactive waste storage container can be smoothly performed.

Additionally, according to the present invention, a mobile truck can smoothly enter a narrow vertical passage using a cable carrier, etc., and can be moved and fixed in position within the vertical passage.

In addition, according to the present invention, the mobile truck can smoothly enter and move into the narrow passage of the radioactive waste storage container, especially the vertical passage between the canister and the cask, and is fixed in position to perform laser peening on the outer wall of the canister.

Figure 1 is a partial cutaway view of a spent nuclear fuel storage container.
Figure 2 shows a schematic concept of a laser peening system according to an embodiment of the present invention.
Figure 3 is a view from above of the interior of the illustrated storage container shown in Figure 2.
Figure 4 shows a laser peening system according to an embodiment of the present invention.
Figure 5 is a side view of the laser peening system shown in Figure 4.
Figure 6 is a top view of the laser peening system shown in Figure 4.
Figure 7 is a rear view of the laser peening system shown in Figure 4.
Figures 8 to 10 show examples of use of the laser peening system shown in Figure 4.
Figures 11 and 12 show a laser peening system according to another embodiment of the present invention.
Figures 13 and 14 show a mobile truck according to an embodiment of the present invention.

Hereinafter, we will look at examples in more detail so that we can understand various characteristic aspects of the present invention. In the drawings, identical or equivalent components may be indicated by the same symbols, and the drawings may be exaggerated or schematically shown for intuitive understanding of the features of the present invention.

Unless otherwise specified or inherently impermissible in this document, expressions to describe the relationship between two elements, such as 'phase' and 'connection', do not mean that the two elements are in direct contact with each other. Of course, a third element is allowed to be inserted between the first and second elements. Directional indications such as front and back, left and right, or up and down are only for convenience of explanation.

In this document, the expression 'A and/or B' is interpreted to include 'A', 'B' or 'A and B'.

Figures 2 and 3 are drawings for explaining the concept of a laser peening system according to an embodiment. In Figure 2, a transfer guide (10) is shown for allowing the mobile truck (20) to enter the storage containers (1, 2), and in Figure 3, the storage containers (1, 2) with the top cover (3) removed or cut. )'s interior top view is shown.

Referring to Figure 2, the storage container includes an inner shell (1), an outer shell (2), and a top cover (3). The outer shell (2) surrounds the inner shell (1) into which the spent nuclear fuel is charged. The inner shell (1) is placed on the bottom (4) of the outer shell (2), and there is a radial gap (6) of about 50 mm, for example, between the inner shell (1) and the outer shell (2), and the outer shell ( 2) On the inner wall, a guide channel (8, see Figure 1) extends in the vertical direction to maintain the gap (6) between the inner shell (1) and the outer shell (2). As an example, the inner shell (1) is a canister and the outer shell (2) is a cask.

The outer shell 2 has a plurality of vents 5 and 7 arranged in the circumferential direction at its upper and lower parts. This is to dissipate heat inside the storage container by natural convection of air. The air flowing into the lower vent (7) is heated as it rises through the gap (6) and flows out to the upper vent (5). To repair the inner shell (1), the transfer guide (10) is installed and the mobile cart (20) is introduced through the upper vent (5).

Referring to FIG. 3, the upper vent 5 includes first to fourth vents 5a to 5d arranged in the circumferential direction. The first edge (P1) of the inner shell (1) inside the first upper vent (5a), and the inner shell (1) inside the second upper vent (5b) on the radially opposite side of the first upper vent (5a). The second edge (P2) is located. The transfer guide 10 is installed horizontally into the outer shell 2 through the first upper vent 5a. The transfer guide 10 is installed to extend through the center of the top surface 1a of the inner shell 1 to the second edge P2. According to one embodiment, the transfer guide 10 has a rotation axis P3 located at the center of the top surface 1a, and the front end of the rotation axis P3 is configured to rotate clockwise or counterclockwise. By rotating the front end of the rotation shaft P3 clockwise or counterclockwise like an arm, the insertion position of the mobile cart 20 into the gap 6 can be selected. For example, after positioning the mobile truck 20 at the front end of the rotation shaft P3, the front end can be rotated 90 degrees clockwise to insert the mobile truck 20 in the direction of the second upper vent 5b.

Referring to FIGS. 2 and 3, the tip of the transfer guide 10 is placed over the second edge P2. The transfer guide 10 is designed to be gently bent downward at its tip 10a so that its path does not bend vertically when the mobile truck 20 enters the inside of the gap 6. The mobile truck 20 moves from outside the outer shell 2 along the transfer guide 10 and enters the gap 6 between the inner shell 1 and the outer shell 2 at the second edge P2.

The mobile truck 20 is inserted into the gap 6 between the guide channels 8 on the inner wall of the outer shell 2. Because the spacing between the guide channels (8) and the spacing between the inner wall of the outer shell (2) and the outer wall of the inner shell (1) are narrow, it is not easy to design and manufacture the mobile truck (20) inserted into the gap (6). not. The mobile truck 20 moves with equipment for repair of the inner shell 1. The mobile truck 20 must be able to move up and down within the gap 6 between the outer shell 2 and the inner shell 1.

The mobile cart 20 may have a moving mechanism based on tracks, wheels, etc. However, in order to move up and down within the narrow gap 6 and perform repair work at a certain position within the gap 6, it is necessary to ensure stable movement of the mobile cart 20. According to the example. A cableveyor is used to ensure stable movement of the mobile truck 20.

In order to remove residual stress around the welded area of the inner shell (1) canister, laser peening is performed on the outer wall of the inner shell (1) using a mobile cart (20). Stress corrosion cracks in stainless steel occur under tensile stress, and in order for the generated stress corrosion cracks to grow, high tensile stress must be maintained for a long period of time. Laser peening irradiates and heats the material surface with a high-energy (5-10J) short-pulse (5-10Hz) laser in a short period of time (5-20ns), causing local plastic deformation of the material surface by the shock wave of the generated high-pressure plasma. It is a technology that solves stress corrosion cracking by increasing fatigue strength by forming compressive residual stress on the surface of the material through restraint by surrounding undeformed parts. During laser peening, the plasma pressure can be further increased by applying a water film to the surface of the material.

4 to 7 show a laser peening system for repairing spent nuclear fuel storage containers 1 and 2 according to an embodiment. Shown in Figures 4 to 7 are prototypes used in the development and performance testing of the laser peening system. Storage containers (1, 2) for storing spent nuclear fuel are simulated.

Referring to Figures 4 and 5, the laser peening system includes a mobile cart 20 and a transfer guide 10 for moving the mobile cart 20. The transfer guide 10 and the storage containers 1 and 2 are supported by the support frame 30.

The mobile truck 20 is equipped with an optical system for laser peening. Various cables for power, data transmission and reception, and laser peening are connected to the mobile truck 20 through a cable carrier line. Power for movement and laser peening of the mobile truck (20) is supplied from the outside through a cable, and a high-energy pulse laser emitted from a laser peening facility placed outside the outer shell (2) is transmitted to the mobile truck (20) through an optical cable. transmitted to the optical system. A water hose is connected to the mobile cart 20 to form a water film along the welded portion on the outer wall of the inner shell 1.

This prototype reflects the concept of the laser peening system shown in Figures 2 and 3. The transfer guide 10 is installed horizontally from outside the outer shell 20 into the outer shell 2 through the upper vent 5, for example, the first upper vent 5a. The transfer guide 10 is installed to extend beyond the radial center of the inner shell 1 to the second edge P2 of the inner shell 1. The mobile cart 20 moves along the transfer guide 10 and is inserted into the gap 6 between the inner wall 2b of the outer shell 2 and the outer wall 1b of the inner shell 1.

According to the embodiment, the transfer guide 10 is composed of a cable carrier. The mobile cart 20 does not move by magnetic force but moves by a cable carrier. Since the mobile cart 20 does not need to be equipped with a heavy motor for movement, it can be manufactured to be lightweight and small. According to this embodiment, the mobile truck 20 can be manufactured to a size more suitable for insertion into the narrow gap 6, and movement and repair work within the gap 6 can be performed stably.

Referring to Figures 4 and 7, the transfer guide 10 includes a transfer rail 11, a cable chain 12 connected to the mobile cart 20, and a longitudinal (x-direction) shear 11a of the transfer rail 11. ) of the curved bracket 16, and a feeding module 18 at the rear end 11b in the longitudinal direction (x direction) of the transfer rail 11.

The transfer rail (11) is installed to extend inside the outer shell (2) through the upper vent (5). The transfer rail 11 prevents the cable chain 12 from sagging and guides the mobile cart 20 and the cable chain 12 to move stably forward and backward in the target direction. The transfer rail 11 has a floor and side walls on both sides of the width direction (y direction).

The cable chain 12 consists of multiple links. For example, in the cable chain 12, joints between links are connected with pins, so that the links can be bent at a certain angle. The front end of the cable chain 12 is connected to the rear end of the mobile cart 20. The cable chain 12 is connected to the rear end of the mobile cart 20 and moves the mobile cart 20 forward or backward by the force of pushing or pulling the mobile cart 20, and moves the mobile cart 20 within the vertical gap 6. ) has a certain degree of rigidity in the longitudinal direction so that it can be suspended, and also has flexibility to bend. The cable chain 12 usually has a linkage structure in which several links are connected, and various technologies can be applied. As a preferred example, the cable chain 12 can be bent not only up and down, but also in the left and right directions.

The curved bracket 16 ensures that the traveling path of the mobile truck 20 descending into the gap 6 between the outer shell 2 and the inner shell 1 is smooth. The curved bracket 16 is designed in a shape that can be seated on the inner shell 1 near the second edge P2. According to the embodiment, when viewed from the side direction (y direction), the curved bracket 16 has a semicircular shape with a curved portion on the upper side. The lower side of the curved bracket (16) is flat so that it is seated on the inner shell (1). The front end of the curved bracket 16 is disposed continuously with the second edge P2. A separate member may be provided so that the curved bracket 16 can be temporarily fixed or stopped near the second edge P2.

The front end (11a) of the transfer rail (11) is connected to the curved bracket (16). The curved bracket 16 has a bolster (16c) installed in the width direction (y direction). The bolsters 16c support the curved bracket 16 and are arranged in plural numbers spaced apart in the moving direction (x-direction) of the mobile cart 20. The bolster 16c more easily adjusts the curvature of the path along which the mobile cart 20 travels and facilitates the manufacture of the curved bracket 16.

Referring to Figures 6 and 7, the cable chain 12 moves forward and backward along the transfer rail 11 by the feeding module 18. The feeding module 18 includes a roller 13 on which a cable chain 12 is wound, and a motor 14 axially connected to the roller 13. The motor 14 can rotate in forward and reverse directions. The roller 13 rotates by driving the motor 14, and the cable chain 12 moves forward or backward depending on the rotation direction of the roller 13. The connecting pin (12a) of the joint between the links of the cable chain (12) is inserted into the groove provided in the roller (13), so that the cable chain (12) moves when the roller (13) rotates. The unexplained reference numeral 15 is a bracket for installing the feeding module 18 to the outer shell 2 in the prototype.

Referring to Figures 4 and 5, the support frame 30 is a first frame (31, 32, 33) that supports the outer shell (2) and the inner shell (1) on the front end (11a) side of the transfer rail (11). ) and a second frame 34 supporting the inner shell (1) and the outer shell (2) at the rear end (11b). The first frame 31 and the second frame 34 are each configured to be movable. In these drawings, the support frame 30 is prepared for simulation of the system. For field application of the system, a frame is required to install and support the transfer rail (11) outside the outer shell (2).

8 to 10 show examples of use of the laser peening system according to the embodiment.

Figures 8 and 9 show the mobile truck 20 entering the gap 6 between the outer shell 2 and the inner shell 1. The front end of the cable chain (12) is connected to the rear end (29) of the mobile cart (20). The curved bracket 16 allows the mobile truck 20, which was moving horizontally along the transfer rail 11, to enter the gap 6 while gently bending. If the design of the travel path (curvature) of the mobile truck 20 near the gap 6 is not optimized, the process of the mobile truck 20 entering the gap 6 cannot be controlled smoothly and stably, and sudden movements or sudden accidents occur. Adverse situations may arise.

Figure 10 shows the cover 19 installed on the transfer rail 11. During the forward and backward process of the cable chain 12, problems may occur in the behavior of the cable chain 12 due to clearance between the rollers 13 and the cable chain 12. For stable operation of the cable chain 12, a cover 19 covering the cable chain 12 is installed on the transfer rail 11. The cover 19 limits the upward movement of the cable chain 12, for example, the bending of some sections of the cable chain 12 up and down. The cover 19, together with the sidewall of the transfer rail 11, allows the cable chain 12 to move forward and backward in the target direction within the transfer rail 11. The cover 19 may, for example, be installed in front of the feeding module 18 to which the cable chain 12 is supplied.

11 and 12 show a laser peening system according to another embodiment.

Referring to FIGS. 11 and 12, the laser peening system is configured so that the curvature of the path through which the mobile truck 20 enters the gap 6 at the front end 11a of the transfer rail 11 can be adjusted. According to the embodiment, the front end (11a) of the transfer rail (11) is connected to the rear end (16b) of the curved bracket (16), and the rear end (16b) of the curved bracket (16) is lifted with respect to the front end (16a). You can lose. A lift 17 is installed on the transfer rail 11 to lift the rear end 16b of the curved bracket 16. The front end (11a) of the transfer rail (11) is connected above the rear end (16b) of the curved bracket (16), and the front end (17a) of the lift (17) is connected below the rear end (16b) of the curved bracket (16). do. In the process of the mobile truck 20 entering the gap 6, the rear end 16b of the curved bracket 16 is lifted using the lift 17 so that the mobile truck 20 moves smoothly into the gap 6. Allow entry. According to this embodiment, the curvature can be adjusted in real time according to the position of the mobile truck 20 on the path where the mobile truck 20 enters the gap 6 from the front end 11a of the transfer rail 11.

13 and 14 show a mobile truck 20 according to an embodiment.

13 and 14, the mobile cart 20 includes a main body 21 and a trailing link 60 behind the main body 21. The main body (21) has a z-direction so that its own weight can be supported by friction with the inner wall (2b) of the outer shell (2) when moving vertically in the gap (6) between the inner shell (1) and the outer shell (2). A supporting module 40 that can be lifted up/down is provided. According to the embodiment, the supporting module 40 is configured as a scissor lift. When the mobile truck 20 enters the gap 6, the supporting module 40 is lifted up and deployed. The supporting module 40 includes a scissor link 41 and a lift plate 42. A pneumatic cylinder is used to operate the scissor lift, i.e. lift up or pop up the lift plate 42.

First roller wheels 27 are installed at the bottom of both sides in the width direction (y direction) of the main body 21. A plurality of first roller wheels 27 are arranged in the longitudinal direction (x direction). In particular, the first roller wheel 27 rolls on the path where the mobile cart 20 enters the gap 6 from the front end 11a of the transfer rail 11 so that the mobile cart 20 can move smoothly. do. Second roller wheels 43 are installed on both sides of the lift plate 42 in the width direction (y direction). The second roller wheels 43 are arranged in plural numbers in the longitudinal direction (x-direction), and roll against the inner wall 2b of the outer shell 2 within the gap 6 so that the mobile cart 20 can move smoothly. make it possible

A laser module 50 for laser peening is provided inside the main body 21. The laser module 50 includes a laser head 51 having an output terminal 55 and a mounting bracket for mounting the laser head 51 to the body. The laser head 51 is configured so that the beam output end 55 can irradiate a downward beam toward the bottom, that is, the outer wall 1b of the inner shell 1 within the gap 6. An optical fiber is connected to the laser head 51 from the rear end of the laser head 51. A beam from a laser oscillator (not shown) is transmitted along the optical fiber and irradiated toward the outer wall 1b through the beam output end 55.

The laser head 51 can be reciprocated left and right by the sliding module 70 to perform laser peening on a wide area, including the weld line 9 of the inner shell 1 and the heat-affected zone around it. there is. Meanwhile, according to one embodiment, the beam irradiated through the beam output end 55 of the laser head 51 may be configured to cause wobble. Due to the spent nuclear fuel stored in the inner shell (2), the use of precision electronic devices or circuits sensitive to radiation is limited, and beam wobble using an optical system alone ensures reliable laser peening over a wide range of areas. There are limitations to implementing laser peening using only beam wobble, as it is difficult to do. Beam wobble and sliding module 52 can be employed together.

Embodiments of the present invention have been described above, and these embodiments will be helpful in understanding various aspects and features of the present invention. The features or elements introduced in these embodiments may be variously and selectively combined with each other, and through these combinations, other embodiments not yet described in this document may be presented.

The scope of the invention sought to be protected is set forth in the claims. The elements described in the claims may be variously changed, modified, and replaced with equivalents without departing from the essence or scope of the invention. The reference numerals in the claims, if provided, are only intended to facilitate easy and intuitive understanding of the claimed inventions or their elements and do not limit the scope of the claimed inventions.

1: Inner shell (canister) 1b, 2b: Vertical wall
2: Outer shell (cask) 3: Top cover
4: Bottom 5,7: Vent
6: Gap 8: Guide Channel
10: Transfer guide 11: Transfer rail
12: Cable chain 17: Lift
18: Feeding module 19: Cover
20: Mobile cart 21: Main body
27,43: roller wheel 30: support frame
41: Scissor link 42: Lift plate
51: Razorhead 60: Rear link

Claims (6)

mobile truck; and
It includes a transfer guide including a transfer rail for moving the mobile cart, a cable chain connected to the mobile cart, and a feeding module for moving the cable chain forward and backward along the transfer rail,
The transfer rail is installed through the upper vent of the outer shell of the storage container, and its front end passes the first edge of the inner shell and spans the second edge on the radially opposite side of the first edge,
A laser peening system configured to allow the mobile cart to move along the transfer rail by the cable chain and be inserted into the gap between the inner shell and the outer shell of the storage container at the second edge. The laser peening system according to claim 1, wherein the curvature of the path through which the mobile cart enters the gap at the front end of the transfer rail can be adjusted according to the entry position of the mobile cart. The laser peening system according to claim 1, wherein a curved bracket is connected to the front end of the transfer rail, and the path through which the mobile cart enters the gap at the front end of the transfer rail is configured to be gently bent downward by the curved bracket. The laser peening system according to claim 3, wherein the front end of the transfer rail is connected to the rear end of the curved bracket, and the rear end of the curved bracket can be lifted depending on the position at which the mobile cart enters the gap at the front end of the transfer rail. The laser peening system according to claim 1, wherein a cover is installed on the transfer rail to limit upward movement of the cable chain. The method of claim 1, wherein the mobile truck,
A laser peening system including a supporting element capable of lifting up to support its own weight by friction with the outer wall surface of the outer shell when moving vertically in the gap between the inner shell and the outer shell.