JP2005289561A - Load conveyance box body with loading and unloading device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To dispose a towing member for towing a movable partitioning wall or a longitudinal member for fixing the movable partitioning wall so as not to obstruct loads and prevent even small block loads such as sand, gravel, and other grains from entering the portions in which the towing member and the movable partitioning wall are disposed, in a load conveyance box body with the loading and unloading device having the movable partitioning wall in which a floor plate is disposed on a bottom portion so as to move fore and aft, and the movable partitioning wall in which only the floor plate moves at the time of stopping and which moves together with the floor plate at the time of traveling is provided on the floor plate as the loading and unloading device for loading and unloading provided in the load conveyance box body, such as a container or a truck loading space. <P>SOLUTION: A first chain 2a and a second chain 2b are disposed in a recessed groove portion of a transverse surface opening which is formed in a longitudinal direction at a bottom corner portion of a box body 10 as the towing member for towing the movable partitioning wall 12 and the longitudinal member for fixing the movable partitioning wall 12, and the transverse surface opening in the recessed groove portion is closed with a band body 8 which is wound around guide rollers 7a, 7b with each other, and travels together with the movable partitioning wall 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention unloads a load loaded without any pallet without any pallet in the box without major modifications to the load carrying box such as a container or a truck bed, and without providing a large device outside or inside. Can be mechanized, and the heavy work of unloading manually can be eliminated, which also improves the work efficiency and the aging of unloading and loading workers. The present invention relates to a load carrying box with a cargo handling device that can be used.

  The applicant previously filed the following application as a container with a cargo handling device for loading and unloading loads.

Japanese Patent Application No. 2000-307713 (Japanese Patent Laid-Open No. 2002-114290)

  In this case, a movable partition wall that moves in the front-rear direction as a load discharging device or a floor plate that can be moved back and forth laid below the movable partition wall is provided in the box body that is a container outer shell.

  In this way, the container is provided with a cargo handling device, and the unloading work of loads loaded without any gaps in the container without a pallet can be mechanized, including loose articles such as chips. The container has a movable bulkhead that moves in the front-rear direction as a load discharge device or a load device in the outer shell, and in the case of load discharge, the chip and other loads are moved in the direction of the discharge port. In the case of loading, the load is sent to the back side by this movable partition, and there is no pallet inside the container without major modification of the container and without a large external device. It becomes possible to mechanize the unloading operation or loading operation of the load loaded without any problems.

  A load such as chips is placed on a floor board in a container box, and moves rearward together with the floor board, and a rear load goes out of the box. At this stage, the load is on the floor plate, but if the floor plate is pulled forward while the movable partition is locked to the box side and the front end of the load is suppressed, the floor plate under the rear load disappears and falls.

  The lock between the movable partition and the box side is released, the movable partition is moved rearward together with the floor of the load, and the subsequent operation is repeated to drop the load sequentially from the rear.

  Even if the cylinder is used for the back and forth movement of the floor board, its stroke may be small and small, and the movable partition does not push out the load such as chips, so its own strength and locking to the bed side plate It doesn't have to be very robust.

  On the other hand, when used as a loading / unloading device, on the contrary, the movable partition wall is at the rearmost position, and this slide is placed after a load such as chips is placed on the floor plate in the container box on the front side. It moves to the front (back side of the box) together with the board, and the load is on the floor board at this stage. Locking the movable bulkhead to the box side and pushing the floor plate backward while suppressing the rear end of the load, then unlocking the movable bulkhead and the box side, and moving the movable partition wall together with the floor plate of the load The load is moved from the rear side to the front side sequentially by repeating the forward movement and the subsequent operation.

  It is possible to selectively and reliably obtain the movement of the floor plate that can be moved back and forth and the movement of the movable bulkhead that moves synchronously or relatively displaces, and prevents the movement of the movable bulkhead from turning to the left and right. The following can be considered as a mechanism capable of maintaining a stable state.

  As shown in FIGS. 12 to 14, the box 10 is, for example, a container or a truck bed, and has a rear end as a discharge port 11.

  A movable partition wall 12 that moves in the front-rear direction as a load discharging device or a loading device is provided in the box body 10, and a floor plate (slide plate) 13 that is laid under the movable partition wall 12 and is movable back and forth.

  The movable partition wall 12 is made of steel, and is disposed in a direction parallel to the discharge port 11 assuming that the box 10 is a rectangular parallelepiped. In addition, the movable partition wall 12 has an inclined surface 12c with the lower portion projecting further forward on the side facing the discharge port 11. The floor plate 13 is also made of steel or stainless steel and may be relatively thin.

  The movable partition wall 12 is placed on the floor plate 13 only in contact with the lower surface. On the other hand, a reciprocating cylinder 15 is provided between the floor plate 13 and the box 10.

  A first rotating body (guide roller) 1a and a second rotating body 1b are provided in the lower part of the movable partition wall 12 so as to be separated from each other in the wall width direction. The body 1c was brought close to the second rotating body 1b to provide a fourth rotating body 1d.

  One end is fixed to the rear end side of the box body 10 and the middle of the first chain 2a fixing the other end to the front end side is stretched over the first rotating body 1a and the fourth rotating body 1d. Set up.

  Further, the middle of the second chain 2b that fixes one end to the front end side of the box 10 and the other end to the rear end side is stretched over the second rotating body 1b and the third rotating body 1c. Set up.

  In this way, the first chain 2a and the second chain 2b are relatively close to each other between the first rotating body 1a, the third rotating body 1c, the second rotating body 1b, and the fourth rotating body 1d. Thus, it will be parallel or substantially parallel.

  As shown in FIG. 15, a sprocket 3 is provided between the first chain 2a and the second chain 2b. The sprocket 3 has a recess 4 into which one of the continuous rings of the chain is fitted. A guide having a curved surface that presses the first chain 2a and the second chain 2b against the sprocket 3 in order to ensure the engagement between the first chain 2a and the second chain 2b and the sprocket 3a. 22 was provided. The guide 22 has a corrugated curved surface so as to be bonded to the first chain 2a and the second chain 2b and to prevent the guide 22 from moving.

  Further, the sprocket 3 is provided on the rotating shaft of a motor 47 that can rotate forward and backward. The motor 47 is a mechanism that serves as a brake for fixing the rotation of the sprocket 3 when stopped.

  As another embodiment, the movable partition 12 is placed on a floor plate (slide plate) 13, and when this locking mechanism does not act, the movable partition 12 moves with respect to the floor plate 13 by friction. It may be a thing.

  Next, the usage will be described. In the case of unloading in a state where the box 10 is loaded on the trailer truck as a container, the discharge port 11 is opened assuming that there is a load in the box 10 as a container. The movable partition 12 is located on the front side of the box 10.

  If the cylinder 15 is extended, the floor plate 13 moves from the front side to the rear end in the box body 10, and the motor 47 is driven to rotate the sprocket 3, and the movable partition 12 is also synchronized with the movement of the floor plate 13. The box 10 is moved from the front side toward the rear end. As a result, the load on the floor plate 13 and the movable partition 12 are also moved accordingly.

  In this state, the first chain 2a is wound halfway around the first rotating body 1a and the fourth rotating body 1d, and therefore, between the first rotating body 1a and the fourth rotating body 1d. The second chain 2b is wound around the second rotating body 1b and the third rotating body 1c in the same manner along the width direction of the movable partition wall 12, so that the first chain 2a and the second chain 2b slidably move the movable partition wall 12, and the movable partition wall 12 is supported by the first rotating body 1a, the second rotating body 1b, the third rotating body 1c, and the fourth rotating body 1d. Since both the left and right sides of the box 10 are pulled back and forth of the box body 10, the movement of turning left and right is prevented and a stable state can be maintained.

  When the movable partition 12 moves together with the floor plate 13 as described above, the first rotating body 1a, the second rotating body 1b, the third rotating body 1c, and the fourth rotating body 1d are connected to the first chain 2a. The second chain 2b is slid, and the movable partition 12 is moved in a cross, so-called staking state, by the first chain 2a and the second chain 2b.

  Next, when the cylinder 15 is reduced and the floor 13 moves in the reverse direction, the motor 47 is stopped, and this is used as a brake mechanism to fix the rotation of the sprocket 3. This stops the movement of the first chain 2a and the second chain 2b via the sprocket 3, and as a reaction thereof, the movable partition 12 is fixed, and the load is as it is because the front end is fixed to the movable partition 12. Even if only the floor board 13 moves, it does not move and returns.

  As described above, (1) the rearward movement of the floor plate 13 and the movement of the movable partition 12 and the load synchronized therewith, (2) the locking of the movable partition 12, and (3) the forward movement of only the floor plate 13 Is repeated to move the movable partition 12 and all the loads sequentially to the rear side of the floor plate 13, and the loads are dropped from the rear end to the outside of the box 10.

  In order to prepare for unloading again from the state where all the loads are unloaded, or to perform loading, it is necessary to move the movable partition wall 12 to the front side of the floor plate 13.

  In this case, the motor 47 is reversely rotated to move only the movable partition wall 12 to the front side to prepare for the next unloading.

  By the way, as shown in FIG. 14, a concave groove 6 having a lateral opening formed in the longitudinal direction of the bottom corner of the box 10 is formed, and the first chain 2 a and the second chain 2 b are formed on the floor plate 13. Both of the portions from the end fixed to the box 10 and the floor board 13 to the rotating bodies 1a to 1d are arranged in the concave groove 6.

  In this way, the first chain 2a and the second chain 2b can be arranged on the floor board 13 so as not to obstruct the load.

  Further, the groove 6 is closed by a flexible plate body 19 such as a rubber plate that hangs down on the lateral surface, so that even if the load is sand, gravel, or other granular or small lump loads, Intrusion can be prevented by the flexible plate 19.

  The first chain 2a and the second chain 2b are laid so as to cross the floor plate 13 from the rotating bodies 1a to 1d, and the portion pushes up the flexible plate body 19 in a warming manner. This will not cause any problems.

  Although the movable partition 12 moves with respect to the flexible plate 19 so as to push it up in a warm manner, there is a risk that it will break with a material such as a rubber plate. Moreover, in the case of a metal such as steel, there is little bending and it cannot be pushed up in a warm shape.

  The object of the present invention is to eliminate the disadvantages of the conventional example described above, and arrange a floor plate that can be moved back and forth at the bottom as a loading / unloading device for discharging or loading a container or a cargo carrier such as a truck bed. On top of this, in a load carrying box with a cargo handling device provided with a movable partition that moves only when the floor is locked and moves with the floor when moved, a pulling member for pulling the movable partition or a long member for fixing the movable partition A load carrying box with a cargo handling device that can prevent the load from entering even in the case of sand, gravel, or other granular or small lump loads. Is to provide.

  In order to achieve the above object, the present invention according to claim 1 arranges a floor plate that can move back and forth at the bottom as a loading / unloading device for loading / unloading a container or a cargo carrier such as a truck bed. On the floorboard, only the floorboard moves when locked, and a load carrying box with a cargo handling device that moves with the floorboard when moving.Long length for fixing the pulling member or movable partition that pulls the movable partition. The groove is disposed in a groove in the lateral opening formed in the longitudinal direction of the bottom corner of the box, wound around the guide rollers, and locked with the movable partition so as to move together with the movable partition. The gist of this is to close the lateral opening.

  According to the first aspect of the present invention, when the movable partition wall moves, the belt body also moves to act as a shutter that always closes the lateral surface opening of the concave groove portion, and acts as a sand, gravel, or other granular or small lump load. Intrusion can be prevented, and there is little risk of breakage because no excessive deformation is applied to the band.

  The gist of the present invention described in claim 2 is that the belt body is made of rubber or synthetic resin, and the guide roller is turned around in parallel in the vertical direction with the guide roller as a folded portion.

  According to the second aspect of the present invention, since the belt is made of rubber or synthetic resin, folding can be obtained at the guide roller, and the belt can be configured in a simple state in which the belt is folded back in parallel. . In particular, even if it is made of rubber, if it is a synchro belt with a wire, a sufficient strength can be obtained.

  According to the third aspect of the present invention, the belt body is made of metal, the guide rollers are provided in the upper and lower stages, the guide rollers are vertically oriented as folded portions that are twisted outward from the guide rollers, and the upper and lower stages. The gist is to hang it on.

  According to the present invention described in claim 3, since it is made of metal, it is rich in robustness and high in shielding accuracy compared to rubber or synthetic resin.

  As described above, the load carrying box with a cargo handling device of the present invention is provided with a floor plate that can be moved back and forth at the bottom as a cargo handling device for discharging or loading a container or a cargo carrier such as a truck bed. In order to fix the pulling member or the movable bulkhead for pulling the movable bulkhead in the cargo transport box with a cargo handling device provided with the movable bulkhead on the floorboard, the movable bulkhead moves only when locked and moves together with the floorboard when moving. The long member can be disposed so as not to obstruct the load, and even if it is sand, gravel or other granular or small-sized load, the load can be prevented without difficulty.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing an embodiment of a cargo carrying box with a cargo handling device of the present invention, FIG. 4 is a plan view of the main part of the same, and the same components as those in FIGS. The same reference numerals are given.

  That is, the box 10 is a box as a container or a truck bed, and the rear end is the discharge port 11.

  A movable partition wall 12 that moves in the front-rear direction as a load discharging device or a loading device is provided in the box body 10, and a floor plate (slide plate) 13 that is laid under the movable partition wall 12 and is movable back and forth.

  The movable partition wall 12 is made of steel, and is disposed in a direction parallel to the discharge port 11 assuming that the box 10 is a rectangular parallelepiped. In addition, the movable partition wall 12 has an inclined surface 12c with the lower portion projecting further forward on the side facing the discharge port 11. The floor plate 13 is also made of steel or stainless steel and may be relatively thin.

  The movable partition wall 12 is placed only on the lower surface of the floor plate 13, and although not shown, a reciprocating cylinder is provided between the floor plate 13 and the box 10.

  A first rotating body (guide roller) 1a and a second rotating body 1b are provided in the lower part of the movable partition wall 12 so as to be separated from each other in the wall width direction. The body 1c was brought close to the second rotating body 1b to provide a fourth rotating body 1d.

  As a pulling member of the movable partition 12 or a long member for fixing the movable partition 12, one end is fixed to the rear end side of the box body 10 and the middle of the first chain 2a fixing the other end to the front end side. It is stretched over the first rotating body 1a and the fourth rotating body 1d.

  Further, the middle of the second chain 2b that fixes one end to the front end side of the box 10 and the other end to the rear end side is stretched over the second rotating body 1b and the third rotating body 1c. Set up.

  In this way, the first chain 2a and the second chain 2b are relatively close to each other between the first rotating body 1a, the third rotating body 1c, the second rotating body 1b, and the fourth rotating body 1d. Thus, it will be parallel or substantially parallel.

  Between the first chain 2a and the second chain 2b, a sprocket 3 in which a recess for fitting one of the continuous rings of the chain is provided at an appropriate interval is disposed.

  Further, the sprocket 3 is provided on the rotating shaft of a motor 47 that can rotate forward and backward. The motor 47 is a mechanism that serves as a brake for fixing the rotation of the sprocket 3 when stopped. The motor 47 is electric or hydraulic, and when using a hydraulic motor, a battery may be mounted and DC control may be performed.

  As described above, since the first chain 2a is wound around the first rotating body 1a and the fourth rotating body 1d, the first rotating body 1a and the fourth rotating body 1d. Since the second chain 2b is wound around the second rotating body 1b and the third rotating body 1c in the same manner along the width direction of the movable partition wall 12, the first chain The movable partition 12 is overlaid by the chain 2a and the second chain 2b. The movable partition 12 is supported by using the first rotating body 1a, the second rotating body 1b, the third rotating body 1c, and the fourth rotating body 1d as fulcrums. Since both the left and right sides of 12 are pulled back and forth of the box body 10, the movement of turning left and right is prevented and a stable state can be maintained.

  When the movable partition 12 moves together with the floor plate 13, the first rotating body 1a, the second rotating body 1b, the third rotating body 1c, and the fourth rotating body 1d are the first chain 2a and the second chain 2b. The movable partition wall 12 is moved in a crossed state, that is, in a so-called staking manner, by the first chain 2a and the second chain 2b.

  As shown in FIGS. 3 and 7, a concave groove 6 having a lateral opening formed in the longitudinal direction of the bottom corner of the box 10 is formed, and the first chain 2 a and the second chain are formed on the floor plate 13. The part from the edge part fixed to the box 10 or the floor board 13 to the rotary bodies 1a and 1b is arranged in this concave groove part 6 in both 2b.

  In this way, the first chain 2a and the second chain 2b can be arranged on the floor board 13 so as not to obstruct the load.

  The portions from the rotating bodies 1c and 1d of the first chain 2a and the second chain 2b to the end portions fixed to the box 10 and the floor board 13 are located on the back side of the movable partition wall 12, There is no load in the box 10 when unloading, and the first chain 2a and the second chain 2b can be exposed without any problem.

  A guide roller 7a is provided on the outer side of the end of the first chain 2a and the second chain 2b that is fixed to the box 10 and the floor plate 13 from the rotating bodies 1c and 1d, and is most distant from the discharge port 11 of the box 10 The guide roller 7b is provided outside the both side positions where the movable partition wall 12 is located, and the endless belt 8 is wound around the guide rollers 7a and 7b.

  As shown in FIGS. 8 and 9, the installation holder 16 for the guide rollers 7a and 7b is provided with a support bracket 15 such as a bolt with a spring 14 interposed therebetween so as to apply a traction force. Can always be stretched. The traction force can be adjusted by adjusting the length with the nut at the end using the support fitting 15 as a bolt.

  The endless belt 8 is made of rubber and is a synchro belt with a wire.

  The guide rollers 7a and 7b are vertically oriented, and the endless belt 8 is provided in such a manner that the guide rollers 7a and 7b are folded back in parallel with each other in the vertical direction.

  In this way, the lateral opening 6a of the groove 6 is closed by the endless belt 8, and at this time, the first chain 2a and the rotating bodies 1c and 1d of the second chain 2b are used for the box 10 and the floor plate 13. The portion up to the end fixed to the belt is housed inside the portion of the belt 8 that is folded back by the guide roller 7a. Note that the first chain 2a and the second chain 2b can be accommodated in the concave groove portion 6 if the rotating bodies 1c and 1d are partially inserted into the concave groove portion 6.

  The endless strip 8 need not be made entirely of rubber, and may be configured as a strip at least a portion capable of closing the lateral opening 6a of the recessed groove portion 6; It is also possible to make the whole endless by connecting parts that are not belts. Here, the endless shape means that the entire shape is endless, and that the portion that becomes the band body includes a part.

  As shown in FIG. 7, the lateral opening 6 a of the recessed groove portion 6 is configured such that the endless belt body 8 is fitted from the side by a receiving metal fitting 17.

  Further, the endless strip 8 is partly locked to the movable partition 12 and moves together with the movable partition 12. The end of the strip 8 is held by the fixing bracket 9 as shown in FIG. ing.

  Next, usage and operation will be described. In the case of unloading with the box body 10, assuming that there is a load in the box body 10 as a container, the discharge port 11 is opened, and the movable partition 12 is located on the front side of the box body 10.

  If the cylinder is extended, the floor plate 13 moves from the front side to the rear end in the box body 10, and the motor 47 is driven to rotate the sprocket 3, and the movable partition wall 12 is also synchronized with the movement of the floor plate 13. The body 10 is moved from the front side toward the rear end, and as a result, the load on the floor plate 13 and the movable partition 12 are also moved accordingly.

  When the movable partition 12 moves together with the floor plate 13, the first rotating body 1a, the second rotating body 1b, the third rotating body 1c, and the fourth rotating body 1d are the first chain 2a and the second chain 2b. The movable partition wall 12 is moved in a crossed state, that is, in a so-called staking manner, by the first chain 2a and the second chain 2b.

  Next, when the cylinder is reduced and the floor board 13 moves in the reverse direction, the motor 47 is stopped, and this is used as a brake mechanism to fix the rotation of the sprocket 3. This stops the movement of the first chain 2a and the second chain 2b via the sprocket 3, and as a reaction thereof, the movable partition 12 is fixed, and the load is as it is because the front end is fixed to the movable partition 12. Even if only the floor board 13 moves, it does not move and returns.

  As described above, (1) the rearward movement of the floor plate 13 and the movement of the movable partition 12 and the load synchronized therewith, (2) the locking of the movable partition 12, and (3) the forward movement of only the floor plate 13 Is repeated to move the movable partition 12 and all the loads sequentially to the rear side of the floor plate 13, and the loads are dropped from the rear end to the outside of the box 10.

  When the movable partition wall 12 moves together with the floor plate 13 as described above, the endless belt 8 also moves together to continue to close the lateral surface opening 6a of the recessed groove portion 6, and the first chain 2a and the second chain 2b. Portions from the rotating bodies 1 c and 1 d to the end portions fixed to the box 10 and the floor board 13 move only inside the band 8.

  FIG. 5 shows a second embodiment of the present invention, in which the endless belt 8 is made of a metal such as steel or stainless steel.

  In the case of a metal, it is more robust than the rubber of the first embodiment and has a high shielding accuracy, but it cannot be folded back with respect to the guide roller.

  Therefore, in this case, in addition to the guide rollers 7a and 7b, the guide rollers 7c and 7d are further arranged in two upper and lower stages, and the endless strip 8 is folded back between the upper and lower guide rollers 7a and 7c and the guide rollers 7b and 7d. Was twisted and the folds were parallel to the top and bottom rather than sideways.

  In the case of the second embodiment, the operation is the same as that of the first embodiment, and a description thereof will be omitted.

  In the above-described embodiment, the first chain 2a and the second chain 2b are the traction member that pulls the movable partition wall 12 or the long member that fixes the movable partition wall 12. However, although not shown, the traction member Alternatively, a rack rail may be provided in the concave groove portion 6 as a long member, and a cam that is locked to the rack rail only in one direction may be provided on the movable partition wall 12.

  Alternatively, a rail-shaped ridge portion may be used as the pulling member or the long member, and a chuck mechanism for this may be provided in the movable partition 12.

It is a top view which shows one Embodiment of the cargo conveyance box body with a cargo handling apparatus of this invention. It is a vertical side view which shows one Embodiment of the cargo conveyance box body with a cargo handling apparatus of this invention. It is a vertical front view which shows one Embodiment of the cargo conveyance box with a cargo handling apparatus of this invention. It is a top view of the important section showing a 1st embodiment of a cargo transportation box with a cargo handling device of the present invention. It is a top view of the principal part which shows 2nd Embodiment of the cargo conveyance box with a cargo handling apparatus of this invention. It is a side view of an endless belt which shows a 2nd embodiment of a cargo transportation box with a cargo handling device of the present invention. It is a vertical side view of the groove part of a horizontal opening. It is a top view of the guide roller installation part of an endless strip. It is a side view of the guide roller installation part of an endless strip. It is a top view of the drive part of a movable partition. It is a vertical front view of the drive part of a movable partition. It is a cross-sectional top view of the load conveyance box body with a cargo handling apparatus of a prior art. It is a vertical front view of a load carrying box with a prior art cargo handling device. It is a vertical side view of a prior art load carrying box with a cargo handling device. It is a top view of the principal part of the load conveyance box body with a cargo handling apparatus of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a ... 1st rotary body (guide roller) 1b ... 2nd rotary body 1c ... 3rd rotary body 1d ... 4th rotary body 2a ... 1st chain 2b ... 2nd chain 3 ... Sprocket 4 ... Concave 6 ... concave groove 6a ... lateral surface openings 7a, 7b, 7c, 7d ... guide roller 8 ... strip 9 ... fixing bracket 10 ... box 11 ... discharge port 12 ... movable partition wall 13 ... floor plate 14 ... spring 15 ... cylinder 16 ... Holder 17 ... Receiving bracket 19 ... Flexible plate 22 ... Guide 47 ... Motor

Claims (3)

  A floorboard that can be moved back and forth is placed at the bottom as a loading / unloading device for loading and unloading inside a container or truck carrier, and only the floorboard moves when locked, In a load carrying box with a cargo handling device provided with a movable bulkhead that moves with the floor plate, a lateral opening that forms a pulling member for pulling the movable bulkhead or a long member for fixing the movable bulkhead in the longitudinal direction of the bottom corner of the box With a cargo handling device characterized in that the lateral opening of the concave groove portion is closed by a belt body that is disposed in the concave groove portion, wound around the guide rollers, locked to the movable partition wall, and moved together with the movable partition wall. Cargo box.   2. A load carrying box with a cargo handling device according to claim 1, wherein the belt is made of rubber or synthetic resin, and the guide rollers are folded back over the guide rollers in the vertical direction.   The cargo handling system according to claim 1, wherein the belt body is made of metal, the guide rollers are provided in the upper and lower stages, and the guide rollers are turned vertically and twisted over the upper and lower stages as a folded portion that is twisted outward from the guide rollers. Cargo box with equipment.

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