KR20110064226A - Anti-derail apparatus - Google Patents

Abstract

PURPOSE: An anti-derailing apparatus is provided to implement stable unloading in spite of fluctuation of a ship due to waves and wind. CONSTITUTION: An anti-derailing apparatus comprises a side contact roller(412), a bottom contact roller(422), and a plate(430). The side contact roller contacts the side of the upper part of an I-shaped rail as being able to rotate and prevents derailing of a transfer device to the left or right. The bottom contact roller contacts the bottom of the upper part of the I-shaped rail and prevents the vertical separation of the transfer device. The plate, to which the side and bottom contact rollers are connected, is attached to the transfer unit moving along the rail.

Description

Rail-break prevention device {ANTI-DERAIL APPARATUS}

The present invention relates to a rail departure prevention device, and more particularly to a rail departure prevention device for allowing various container transport means to move stably without leaving on the rail.

Maritime transportation using ships as a means of moving goods between remote areas uses less energy than other means of transportation and the transportation cost is low, making up a large part of international trade.

Recently, in the sea transportation using a container, a large sized ship is used to improve the efficiency of transportation, which is to secure the economics of transportation by increasing the amount of transportation of the vessel. As a result, more ports and ports are required to dock large vessels and to unload containers.

However, harbors that can dock large container ships are limited at home and abroad, and the construction of such ports requires a lot of expenses due to dredging to maintain the required port depth, as well as a large place. In addition, due to the construction of a large port has a lot of influence on the surrounding environment, such as causing a traffic jam or destruction of the coastal environment, there are many restrictions on the construction of a large port.

Therefore, there is a need for the development of a new system that can unload cargo at sea offshore, without having to dock a large vessel on the quay of a seaport on land. In this regard, a mobile harbor (Mobile Harbor) and Patent invention (registration number 10-0895604) regarding the cargo transfer method used was received. 1 is a view showing a schematic view of the mobile port shown in the patent. The mobile floating port 10, which is a marine floating body, may perform an unloading operation by using a crane 20, and FIG. 1A shows the unloading between the mobile harbor 10 and the large container ship 30, and FIG. 1B shows the mobile harbor. The unloading between 10 and the land pier 40 is shown.

2 is a view schematically showing a state of performing container unloading by using a crane installed in a mobile harbor. Here, the longitudinal direction X of the mobile harbor 10 is defined as the longitudinal direction, the width direction Y direction is the transverse direction, and Z direction is defined as the vertical direction. When the crane 20 unloads the container C between the container ship 30 or the land pier 40 using the spreader 80, the container C is fastened to the spreader 80. It moves along the direction of the arrow shown in the figure.

In this case, even after the spreader 80 moves to the mobile port 10 side, the container C is loaded at a desired position on the mobile port 10 by repeatedly moving the transverse direction, the longitudinal direction and the vertical direction. do. In addition, the spreader 80 can then start the unloading work for the next container only after repeating several movements again through the reverse process. Therefore, the unloading operation by the crane 20 only takes a long time and there is a problem that the work efficiency is low, it is necessary to solve this.

In addition, the loading and unloading operation of the container (C) is to move the cargo of several tons to several tens of tons, it is required that the unloading device such as the mobile harbor 10 and the crane mounted thereon to be balanced and move along a predetermined path. In the sea, the fluctuation of the ship is indispensable under the influence of wind, blue, or tidal current. Despite this fluctuation, an unloading device having a structure capable of moving along a predetermined path without shaking during operation at sea is required. Do.

The present invention has been made in consideration of the necessity as described above, and various container transport means such as a crane, an automatic unloading device, a container transporting device can stably move on a rail, and when installed on a ship, It is an object of the present invention to provide a rail departure preventing device that can perform a stable unloading operation despite the fluctuation of the ship.

The present invention, the side contact roller to be in contact with the upper side of the I-type rail rotatable and prevent the left and right separation of the conveying means, and the bottom contact contacting to be rotatable in the upper lower surface of the I-type rail and to prevent the top and bottom of the conveying means Provided with a roller and a plate attached to the conveying means moving along the rail, the side contact roller and the lower surface contact roller is rotatably connected to the plate.

The side contact roller may be connected to the plate through a side bar provided on the plate, and the bottom contact roller may be connected to the plate through a bottom bar provided on the plate.

The side contact roller and the side bar may be formed in plural, and the side bars may be connected to and supported with each other.

In another aspect, the present invention, the rail departure preventing device is attached to the wheel fastening portion is fastened so that at least one wheel is rotatable, provides a rail moving device for moving along the I-type rail.

In another aspect, the present invention provides a container unloading device is attached to the wheel fastening portion is fastened so that one or more wheels rotatable, the rail is moved along the I-type rail.

According to the present invention, by the use of the rail departure prevention device, various container transport means such as an automatic unloading device can be stably moved without being separated on the rails, especially when installed on a ship, the fluctuation of the ship by the sea waves and wind Nevertheless, stable unloading can be performed.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that detailed descriptions of related well-known technologies or functions may obscure the gist of the present invention, the detailed description thereof will be omitted.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

DETAILED DESCRIPTION Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings, and in the following description with reference to the accompanying drawings, the same or corresponding components will be given the same reference numerals and redundant description thereof will be omitted. do.

Prior to describing the present invention, the standard of the container C will be described with reference to FIG. 18. Commonly used containers include a Twenty-foot Equivalent Unit (TEU) container and a Forty-foot Equivalent Unit (FEU) container. TEU containers are 20 feet long (L), FEU containers are 40 feet long (L), and both containers are 8 feet wide (W) and 8 feet high (H). Is the same in inches.

It looks at the container two-stage unloading device according to the present invention.

3 is a view schematically showing a state in which a container two-stage unloading device according to an embodiment of the present invention is installed on a ship to perform container unloading. Here, the longitudinal direction X of the vessel 500 is defined as the longitudinal direction, the width direction Y direction is the transverse direction, and Z direction is defined as the vertical direction.

Container two-stage unloading device according to an embodiment of the present invention, the platform 520, the crane 100, and the automatic unloading device 200.

The platform 520 has a space in which the container C is loaded. As shown in FIG. 3, the platform 520 may be a deck of the ship 500, but a dock of the land may also be used. The vessel 500 is floating on the sea and can be moved to perform the function of the mobile port, and may also have its own power.

The automatic unloading device 200 includes a frame module 210 supported by the platform 520, a container transport module 300 and a spreader module 280 moving along the frame module 210.

The container transport module 300 performs a function of transferring the container C between the automatic loading and unloading device 200 and the crane 100.

The spreader module 280 transfers the container C with the container transport module 300 and loads the container C with the platform 520.

The crane 100 includes a crane boom 120, a crane leg 110, and a crane spreader 180. The crane 100 may be installed in close proximity to the automatic unloading device 200, and may further share some structures with the automatic unloading device 200.

The crane boom 120 is formed on the upper portion of the automatic loading and unloading device 200 and uses a spreader to transfer the container C between the container transport module 300 and a container (S) between the container ships S that are unloaded. C) Transfer

The crane leg 110 is a structure for supporting the crane boom 120. In the embodiment of FIG. 3, two crane legs 110 are installed at intervals at both ends of the platform 520 at intervals. Automatic loading and unloading device 200 is installed between the two crane legs 110 can move in the longitudinal direction.

Here, the unloading target of the crane 100 may be a land pier or another place other than the container ship S, and may be another ship or another mobile port. Alternatively, the container transfer in the automatic unloading device 200 and the container transfer in the crane 100 may be performed in parallel or simultaneously.

Hereinafter, the structure and function of the automatic unloading device 200 will be described in detail.

4 is a perspective view three-dimensionally showing the container automatic loading and unloading device 200 according to an embodiment of the present invention. 5 is a perspective view three-dimensionally illustrating the frame module 210 of the automatic container unloading device according to an embodiment of the present invention. 6 is a plan view conceptually illustrating the automatic container unloading device according to an embodiment of the present invention.

The automatic unloading device 200 includes a frame module 210, a container transportation module 300, and a spreader module 280.

As shown in FIG. 4, the frame module 210 includes a moving frame 214 through which the container transportation module 300 and the spreader module 280 move, and a support frame 212 supporting the moving frame 214. It may include. The moving frame 214 has an elongated shape and is horizontally installed, and the support frame 212 may support both ends of the moving frame 214.

The frame module 210 may be provided with a frame module transfer unit 230 for allowing the frame module 210 to move along the rail 240. The side surface of the frame module 210 may be provided with a side support part 220 fixed to the platform 520 to support the frame module 210. The frame module 210 may be guided and moved by the side support part 220.

The container transport module 300 and the spreader module 280 on the frame module 210 may move using different rails so as not to interfere with each other. The frame module 210 may move in the longitudinal direction, and the container transport module 300 and the spreader module 280 may move in the horizontal direction.

Referring to FIG. 5, the moving frame 214 may be supported by a support wire 216 having an intermediate portion connected to the support frame 212. In addition to the frame formed vertically, the support frame 212 may be a frame formed horizontally or diagonally or curved to increase rigidity, or may have a separate reinforcing structure 218.

Referring to FIG. 6, the moving frame 214 may be installed in parallel with two frames spaced apart from each other, and the distance between the two frames may be wider than the length of the FEU container C40. One FEU (C40), one TEU (C20), or two TEUs (C20) may pass between the two moving frames 214.

7 is a view schematically showing how the container automatic loading and unloading apparatus 200 according to an embodiment of the present invention performs container unloading.

As shown in FIG. 7, the container transport module 300 and the spreader module 280 may include transport module transporters 310 and spreader transporters 284 that move along rails formed in the frame module 210, respectively. Can be.

The container transport module 300 loads and transports the container C thereon. The container transport module 300 may be formed in a quadrangular shape corresponding to the shape of the container. The container transportation module 300 will be described later in detail.

The spreader module 280 may include a container fastening portion 282 contacting the container C at a lower portion corresponding to the container transportation module 300. The spreader module 280 supports a plurality of support bars 288 that form a space through which the container can pass, and a cable 286 that is supported at the top of the support bars 288 to raise and lower the container fastening portion 282. It can be provided.

The frame module transfer unit 230, the transfer module transfer unit 310, or the spreader transfer unit 284 may be implemented in a form including a transfer wheel or a roller. The transfer units 230, 310, and 284 may include a rail departure preventing module 400 to prevent the rails from being separated from the rails. The rail departure prevention module 400 will be described in detail later.

8A and 8B are perspective views showing other embodiments of the container automatic loading and unloading vessel of the present invention, respectively.

As shown in FIG. 8A, the support frame 212 may be installed near the middle of the moving frame 214 as well as across the platform 520 of the ship, to prevent sagging of the moving frame 214. As shown in FIG. 8B, two or more automatic unloading devices 200 may be installed and operated independently of each other.

Hereinafter, a method of operating a two-stage unloading device or an automatic unloading device will be described with reference to FIGS. 3 and 7.

In a two-stage unloading method according to an embodiment of the present invention, a crane spreader 180 mounted on the crane 100 receives and transports the container C between the container ship S and a step S600. And a first step S610 in which the crane spreader 180 delivers the container C to the automatic unloading device 200, and the automatic unloading device 200 moves the container C to a desired position on the platform 520. The second step (S620) for transporting, and the third step (S630) for the automatic loading and unloading device 200 to load the container (C) on the platform 520.

The first step (S610), the container transport module 300 receives the container C from the crane 100 and loads the container (C) 1-1 (S611), and the container transport module 300 or the spreader module. Step 1-2 (S612) in which the 280 moves along the frame module 210 and faces each other, and the first-3 in which the container transportation module 300 delivers the container C to the spreader module 280. Step S613 may be included.

In the second step S620, the frame module 210 supported by the platform 520 directly moves in the longitudinal direction to transfer the container C to the second step S621, and the frame module 210. The container transport module 300 or the spreader module 280 moving along the second may include a second step (S622) for transporting the loaded container (C) in the lateral direction.

In this case, the movement in the second-second step S622 may be achieved by the movement in the first-second step S612. In addition, step 2-1 (S621) and step 2-2 (S622) may be performed simultaneously or in any order. In addition to this, the order is described in each step, but this is for convenience only, and each step may be performed in any order by appropriate selection.

In the embodiment of the present invention has been described a case of unloading the container from the container ship (S) to the mobile port 500, but the present invention reversely performs the unloading from the ship 500 to the container ship (S) Also includes apparatus and methods. In addition, the terms convey, convey, and load include the meaning of receiving, conveying or lifting.

According to the present invention, in the unloading operation of the container, the crane 100 and the automatic unloading device 200 can work in parallel or simultaneously and cooperate with each other, thereby reducing the unloading time. In addition, the automatic loading and unloading device can load a container at a desired loading position at high speed, thereby maintaining stability at the center of gravity of the installed vessel.

Using the present invention, it is possible to load the container systematically and smoothly, compared to the method of transporting the container to a vehicle, etc. after first laying down the container on the platform. In addition, the automatic unloading device receives the container from the air and transports it, which is efficient in terms of time and cost, and furthermore, the container can be loaded anywhere on the platform.

Next, the container transportation module 300 (hereinafter also referred to as a container transportation device) will be described.

9 is a perspective view showing the structure of a container transport apparatus 300 according to an embodiment of the present invention. 10 is a side view illustrating the position and role of the container fixing part 330 of the container transport apparatus according to an embodiment of the present invention.

Referring to FIG. 9, the container transport apparatus 300 according to an embodiment of the present invention includes a loading frame 320 in which a container is loaded on an upper portion thereof, and a fixing hole mounted on the loading frame 320 and formed on a bottom surface of the container. A plurality of container fixing parts 330 inserted into and fixed to the container, a rotating driving part 350 fastening the container fixing parts 330 to a fixing groove through a rotating motion to fix the container, and a plurality of container fixing parts It includes a vertical drive unit 340 to selectively insert the 330 into the fixing groove.

The container transport apparatus 300 may further include a transport module transport unit 310 provided in the loading frame 320 to allow the container transport device to be movable. The container transport apparatus according to the present invention through the movement by the transfer unit 310 may be an independent vehicle itself.

The loading frame 320 is formed in a quadrangular shape corresponding to the shape of the FEU container or the TEU container, and the container fixing part 330 is formed at the position corresponding to the fixing hole formed on the lower surface of the FEU container or the TEU container. It may be inserted into and mounted on 320. Specifically, the loading frame 320 is formed in a quadrangular shape corresponding to the shape of the FEU container, the container fixing portion 330 is 0 point (A), 1 of the length of the TEU container from each end of the loading frame 320 It can be mounted to the loading frame 320 at the / 2 point (B), 1 point (C).

As shown in FIG. 10, when loading one TEU container, a container fixing part 330B installed at a 1/2 point is used. When loading two TEU containers, a container fixing part 330A installed at point 0 and a container fixing part 330C installed at one point are used. When loading the FEU container, the container fixing part 330A installed at the zero point is used. Here, the container fixing portion 330A of the 0 point may be maintained in a protruding state, and the container fixing portion 330B of the 1/2 point and the container fixing portion 330C of the 1 point are selectively protruded to secure the container. Used or inserted into the loading frame 320 does not interfere with the loading of the container.

11 is a perspective view showing the structure of the container fixing part 330 of the container transport apparatus according to an embodiment of the present invention. The container fixing part 330 is rotatably mounted to the housing 338 and the housing 338 inserted into the loading frame 320 and rotated in accordance with the rotation of the lock adjusting part 332. It can be provided.

12 is a perspective view illustrating a structure of a rotation driving unit 350 of a container transport apparatus according to an embodiment of the present invention. The rotary drive unit 350 includes a drive bar 356 for converting the rotational motion of the drive motor 352 and the drive motor 352 into linear motion, and the optionally inserted container fixing part 330 includes the drive bar 356. The container can be fixed by converting the linear motion of) into a rotary motion.

13 is a perspective view illustrating a structure of the vertical driving unit 340 of the container transport apparatus according to an embodiment of the present invention. The vertical driving unit 340 may include a plurality of selection cams 344 for vertically moving the plurality of container fixing units 330 and a cam connection bar 342 to which the plurality of selection cams 344 are connected and rotated. . Specifically, the selection cam 344 is provided at the 1/2 point (B) and one point (C) and is formed to protrude in different directions from the cam connection bar 342, the selection cam 344 is crossed with each other The container fixing part 330 can be moved up and down.

14A and 14B are views illustrating how the container fixing part 330 of the container transport apparatus according to an embodiment of the present invention operates differently according to positions. An example of working when loading two TEU containers is shown.

 When the cam connecting bar 342 rotates by the operation of the up and down driving unit 340, the rotating cam also rotates accordingly. At this time, since the selection cam 344 protrudes from the cam connecting bar 342 in different directions, the container fixing part 330B of FIG. 14A is lowered with the movement of the selection cam 344B, and FIG. 14B. In the selection cam 344C raises the container fixing part 330C.

Subsequently, the rotation driving unit 350 is operated so that the driving bar 356 rotates the lock adjusting unit 332 so that the twist lock 336 also rotates. At this time, the twist lock 336B in Fig. 14A idles without being inserted into the fixing hole of the container. On the other hand, the twist lock 336C of FIG. 14B rotates while being inserted into the fixing hole of the container to fix and fasten the container.

The use of a container transport device enables crane spreaders to transport and load containers faster and more efficiently than loading containers directly, and in particular to systematically and smoothly unload operations for containers of various sizes. Here, the container transport apparatus is used in the automatic unloading apparatus according to the embodiment of the present invention, but the appearance may be variously implemented.

Next, the rail departure prevention module 400 (hereinafter, also used as a term for a rail departure prevention device) that can be used in a rail moving device moving on an I-type rail will be described.

First, the shape of the I-type rail 240 will be described with reference to FIG. 19. As shown in the figure I-shaped rail is formed with a recessed recess, the portion to be used in the present invention is the upper lower surface of the rail and the upper side of the rail.

Rail moving apparatus according to an embodiment of the present invention may be a frame module transfer unit 230 (see Fig. 4 or 5) attached to the lower portion of the frame module 210. The rail moving device is not limited to the frame module conveying unit 230 of the automatic unloading device, and can also be used in the conveying module conveying unit 310 or the spreader conveying unit 284. Furthermore, various container transfer means such as a general crane may be an application example, and any device that moves widely on an I-type rail may be included.

15 is a perspective view showing a state of a rail moving device to which a rail departure preventing device is attached according to an embodiment of the present invention.

An example of a rail moving device, the frame module transfer unit 230 may include one or more wheels 238, a wheel fastening part 236 to which the wheels 238 are rotatably fastened, and a rail attached to the wheel fastening part 236. The departure prevention apparatus 400 is included.

16A and 16B are views conceptually illustrating a rail departure preventing apparatus according to an embodiment of the present invention. 17 is a view showing the structure of the rail departure prevention apparatus according to an embodiment of the present invention.

Rail departure preventing device 400 according to an embodiment of the present invention, the side roller portion 410 is provided with a side contact roller 412 in contact with the rotatable upper side of the I-type rail to prevent the left and right separation of the conveying means And attached to the lower surface roller portion 420 and the wheel fastening portion 236 having a lower surface contact roller 422 which rotates and rotates on the upper lower surface of the I-type rail and prevents the upper and lower deviations of the transfer means. And a plate 430 to which the roller 412 and the bottom contact roller 422 are rotatably connected.

The side contact roller 412 is connected to the plate through the side bar 414 provided in the plate 430, and the bottom contact roller 422 is connected to the plate 430 through the bottom bar 424 provided in the plate 430. ) Can be connected. The side contact roller 412 and the side bar 414 may be formed in plural, and the side bar 414 may be connected to each other and supported. In addition, various reinforcements 434 may be used to increase rigidity. The plate 430 is attached to the wheel fastener 236 by the plate fastener 432.

In the rail moving device according to the present invention, the wheel 238 and the rail departure preventing device 400 move together in contact with the rail 240 so that the rail moving device shakes on the rail despite the fluctuations transmitted to the rail moving device. You can move without falling off.

The use of the rail departure prevention device enables various container transport means such as cranes, automatic unloading devices, and container transport devices to move stably on the rails. And stable unloading operation.

As mentioned above, although specific embodiment of this invention was described, this is only an illustration and this invention is not limited to this, It should be interpreted that it has the broadest range based on the basic idea disclosed in this specification. Those skilled in the art can change the material, size, etc. of each component according to the application field, it is possible to implement the pattern of the shape not shown by combining or replacing the disclosed embodiments, but this also does not depart from the scope of the present invention will be. In addition, those skilled in the art can easily change or modify the disclosed embodiments based on the present specification, it is apparent that such changes or modifications are included in the scope of the present invention.

1a and 1b is a view showing a schematic view of the mobile port shown in the prior patent.

2 is a view schematically showing a state of performing container unloading by using a crane installed in a mobile harbor.

3 is a view schematically showing a state in which a container two-stage unloading device according to an embodiment of the present invention is installed on a ship to perform container unloading.

4 is a perspective view three-dimensionally showing the automatic container unloading device according to an embodiment of the present invention.

5 is a perspective view three-dimensionally showing the frame module of the automatic container unloading device according to an embodiment of the present invention.

6 is a plan view conceptually illustrating the automatic container unloading device according to an embodiment of the present invention.

7 is a view schematically showing how the container automatic loading and unloading device according to an embodiment of the present invention performs container unloading.

8A and 8B are perspective views showing other embodiments of the container automatic loading and unloading vessel of the present invention, respectively.

9 is a perspective view showing the structure of a container transport apparatus according to an embodiment of the present invention.

10 is a side view showing the position and the role of the container fixing portion of the container transport apparatus according to an embodiment of the present invention.

11 is a perspective view illustrating a structure of a container fixing part of the container transportation device according to an embodiment of the present invention.

12 is a perspective view illustrating a structure of a rotation driving unit of a container transport apparatus according to an embodiment of the present invention.

FIG. 13 is a perspective view illustrating a structure of a vertical driving part of a container transport apparatus according to an embodiment of the present invention. FIG.

14A and 14B are views illustrating how the container fixing part of the container transport apparatus according to an embodiment of the present invention operates differently according to positions.

FIG. 15 is a view illustrating a rail moving device to which a rail departure preventing device according to an embodiment of the present invention is attached. FIG.

16A and 16B are perspective views conceptually illustrating a rail departure preventing apparatus according to an embodiment of the present invention.

17 is a view showing the structure of the rail departure prevention apparatus according to an embodiment of the present invention.

It is a figure which shows the shape of a general container.

It is a figure which shows the shape of an I-type rail.

<Description of identification number in drawing>

100: crane 110: crane leg

120: crane boom 180: crane spreader

200: automatic loading and unloading device 210: frame module

212: support frame 214: moving frame

216: support wire 218: reinforcing structure

220: side support

230: frame module transfer unit 236: wheel fastener

238: wheel 240: rail

280: spreader module 282: container fastening portion

284: spreader feed section 286: cable

288: support bar

300: container transportation module 310: transportation module transfer unit

320: loading frame 330: container fixing portion

332: lock adjuster 336: twist lock

338: housing 340: vertical drive

342: cam connection bar 344: cam selection

350: rotary drive unit 352: drive motor

356: drive bar

400: rail departure prevention module 410: side roller portion

412: side contact roller 414: side bar

420: lower surface roller 422: lower surface contact roller

424: bar bar 430: plate

432: plate fastening portion 434: reinforcing material

500: ship 520: platform

S: container ship C: container

Claims (5)

A side contact roller contacting to be rotatable on the upper side of the I-type rail and preventing left and right separation of the conveying means; A lower surface contact roller which is rotatably in contact with the upper lower surface of the I-type rail and prevents the upper and lower portions of the conveying means from falling off; A plate attached to a conveying means moving along a rail, wherein the side contact roller and the bottom contact roller are rotatably connected. Rail departure prevention device that includes. The method of claim 1, The side contact roller is connected to the plate through the side bar provided on the plate, The bottom contact roller is connected to the plate through a bottom bar provided on the plate. Rail break prevention device. The method of claim 2, The side contact roller and the side bar is formed in plurality, The side bars are connected to each other and supported Rail break prevention device. The rail shifting device according to any one of claims 1 to 3 is attached to a wheel fastening part to which at least one wheel is rotatably fastened and moves along an I-type rail. 4. The container unloading device of claim 1, wherein the rail departure preventing device of claim 1 is attached to a wheel fastening part to which at least one wheel is rotatably fastened and moves along an I-type rail.

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