JP2019196264A - Connection conveyor - Google Patents

Abstract

To provide a connection conveyor, which is configured so that stress generated in a connection part of the conveyor is reduced when a travelling carriage meanders.SOLUTION: A connection conveyor 21, which is connected to a travelling carriage 20 which travels in a horizontal direction, comprises a fourth conveyor 3d, a fifth conveyor 3e and a connection member 23. The fourth conveyor 3d is a device that extends in a first direction to convey a cargo in the first direction. The fourth conveyor 3d has a front side end to be connected to the travelling carriage 20. The fifth conveyor 3e is positioned below the fourth conveyor 3d and partially overlaps with a rear side end of the fourth conveyor 3d in a planar view. The connection member 23, arranged between the fourth conveyor 3d and the fifth conveyor 3e in a height direction, connects the fourth conveyor 3d to the fifth conveyor 3e. The connection member 23 turns around a Y-axis and turns around a Z-axis.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a connection conveyor, and more particularly to a connection conveyor connected to a traveling carriage.

Conventionally, a load in a container that has arrived at a destination is taken out of the container and reloaded onto a pallet. For this transshipment, a vanning and devanning apparatus for unloading (devanning) from a container is used (see, for example, Patent Document 1).
Specifically, the front end of the conveyor of the apparatus is placed in a container, and an operator places a load on the conveyor in the container. The conveyor then transports the load out of the container, and finally another worker loads the load on the pallet.

JP 2017-224136 A

The vanning / devanning apparatus includes, for example, a traveling carriage and a plurality of conveyors connected to the traveling carriage. The plurality of conveyors are connected to each other.
In a conventional apparatus, for example, when the traveling carriage is steered during traveling, the entire traveling body travels while meandering. At that time, a large stress is generated in the connecting portion between the conveyors, so that the connecting portion is expected to be damaged.

An object of the present invention is to prevent breakage of the connecting portion between the conveyors by reducing the stress generated in the connecting portion of the connecting conveyor when the traveling carriage meanders.
Another object of the present invention is to make the connecting conveyor compact.

  Hereinafter, a plurality of modes will be described as means for solving the problems. These aspects can be arbitrarily combined as necessary.

A connection conveyor according to an aspect of the present invention is a connection conveyor that is connected to a traveling carriage that travels in a horizontal direction, and includes a first conveyor device, a second conveyor device, and a connection member.
The first conveyor device is a device that extends in the first direction and conveys the load in the first direction. The first conveyor device has a first direction first end connected to the traveling carriage.
The second conveyor device is located below the first conveyor device, and partially overlaps the first direction second end of the first conveyor device in plan view.
The connecting member is disposed between the first conveyor device and the second conveyor device in the height direction, and connects the first conveyor device and the second conveyor device. The connecting member enables the first conveyor device and the second conveyor device to rotate about an axis parallel to the second direction that intersects the first direction and extends in the horizontal direction, and in the third direction that is the vertical direction. It can be rotated around a parallel axis.
In this case, since the first conveyor device can rotate around the axis parallel to the third direction with respect to the second conveyor device, when the both conveyor devices meander during traveling, the connecting portion of both conveyor devices is large. No stress is generated.
Furthermore, since the first conveyor device and the second conveyor device are arranged one above the other, the first conveyor device can be rotated 180 degrees from the load-conveyable state to the storage state. The overlapping area of the second conveyor device can be increased. That is, in the stored state, the connecting conveyor is compact with respect to the first direction. Specifically, in the stowed state, the first conveyor device and the second conveyor device rotate around the connection member, and are the end portions on the side connected to the traveling carriage of the first conveyor device in plan view. The 1st direction 1st edge has overlapped with the 2nd conveyor apparatus.
In addition, a load conveyance possible state is a state which can convey a load on the 1st conveyor apparatus and the 2nd conveyor apparatus on it in the shape of a straight line or a slant with respect to each other in planar view.

  The connecting member may have a first connecting member, a second connecting member, and a third connecting member. In that case, the first connecting member connects the second connecting member and the first conveyor device to each other, and the third connecting member connects the second connecting member and the second conveyor device to each other. The first connecting member and the second connecting member are rotatable with respect to each other around an axis parallel to the second direction. The second connecting member and the third connecting member are rotatable with respect to each other around an axis parallel to the third direction.

At least the first conveyor device side of the second conveyor device may be wider than the first conveyor device in the second direction.
In this case, even if the first conveyor device is displaced in the second direction with respect to the second conveyor device, the load is reliably delivered from the first conveyor device to the second conveyor device. That is, the load does not fall.

The connection conveyor may further include an additional conveyor device and a rotation stopper.
The additional conveyor device is connected to the first direction second end of the first conveyor device.
The rotation prevention part is provided in the 1st conveyor apparatus side edge part in the 1st direction of a 2nd conveyor apparatus.
When the first conveyor device is rotated 180 degrees around an axis parallel to the third direction with respect to the second conveyor device, and the connected conveyor is in the storage state, the additional conveyor device and the rotation preventing portion overlap in the second direction view. .
In this case, a special operation for preventing the first conveyor device from rotating with respect to the second conveyor device becomes unnecessary.

In the connection conveyor according to the present invention, the stress generated in the connection part of the connection conveyor when the traveling carriage meanders can be reduced, and therefore the connection part between the conveyors is not easily damaged.
The connecting conveyor according to the present invention becomes compact.

1 is a side view of a vanning / devanning apparatus according to a first embodiment of the present invention. The perspective view of a vanning and a debanning apparatus. The typical side view of a connection conveyor (load conveyance possible state). The schematic plan view of a connection conveyor (load conveyance possible state). The typical side view of a connection conveyor (load conveyance possible state). The schematic plan view of a connection conveyor (load conveyance possible state). The typical side view of a connection conveyor (storage state). The schematic plan view of a connection conveyor (storage state). The schematic front view of a connection conveyor (storage state). The front view of a connection member. The top view of a connection member. The side view of a connection member.

1. First Embodiment (1) Basic Configuration of Vanning / Devanning Device A vanning / devanning device 1 (hereinafter referred to as “device 1”) will be described with reference to FIGS. 1 and 2. FIG. 1 is a side view of the vanning and devanning apparatus according to the first embodiment of the present invention. FIG. 2 is a perspective view of the vanning and devanning apparatus.
In the following description, the length direction of the apparatus 1 is defined as a first direction (arrow X), the width direction is defined as a second direction (arrow Y), and the height direction is defined as a third direction (arrow Z). An axis extending in the first direction is an X axis, an axis extending in the second direction is a Y axis, and an axis extending in the third direction is a Z axis.

The device 1 is used, for example, to unload a container (devanning) or to load a container (vanning), for example. Accordingly, the device 1 is moved to the container placement position for debunning and / or vanning of the load.
The apparatus 1 mainly includes a conveyor 3, a work table 5, and a traveling unit 7.

(2) Conveyor The conveyor 3 is a device that conveys a load from a load input unit to a load discharge unit in a state where the load is placed on the upper surface. Hereinafter, for simplification of description, a case where the apparatus 1 is used as a devanning apparatus will be described. In this case, the upstream side in the transport direction of the conveyor 3 is the front side, and the downstream side in the transport direction is the rear side.
The conveyor 3 is composed of a plurality of conveyors. Specifically, the conveyor 3 includes a first conveyor 3a, a second conveyor 3b, a third conveyor 3c, a fourth conveyor 3d, and a fifth conveyor 3e arranged side by side in the first direction. is doing. The first conveyor 3a is a belt conveyor driven by a motor. The second to fifth conveyors 3b to 3e are free roller roller conveyors. However, these conveyors may be driven by a motor.

The first conveyor 3a is a loading unit for an operator to place a load during the devanning operation. The first conveyor 3a is disposed, for example, inside or outside a container or a truck when performing vanning or devanning.
The load conveying surface of the first conveyor 3a is moved to the rear side by a conveyor driving unit (not shown) such as a motor.

The rear end of the first conveyor 3a is attached to the traveling unit 7 so as to be rotatable about the Y axis. Furthermore, the conveyor raising / lowering part (not shown) which rotates the 1st conveyor 3a is provided. The conveyor elevating unit is a known technique for elevating the tip of the first conveyor 3a, and includes an elevating motor, a rotation driving unit composed of a plurality of gears, and the like.
The rear end of the first conveyor 3a is attached to the traveling unit 7 so as to be rotatable about the Z axis. More specifically, the various structures of the conveyor lifting part described above are rotatable about the Z axis with respect to the traveling part 7.
Thereby, the operator can move the front-end | tip of the 1st conveyor 3a to the desired position of up and down, left and right.

  The second conveyor 3b is provided on the rear side of the first conveyor 3a. Between the 1st conveyor 3a and the 2nd conveyor 3b, the 1st additional conveyor 3f for bridging the rear end of the 1st conveyor 3a and the 2nd conveyor 3b is provided. Thereby, the load conveyance surface of the 1st conveyor 3a and the load conveyance surface of the 2nd conveyor 3b can be connected by a small level | step difference.

The third conveyor 3c is connected to the upper rear end of the traveling unit 7 so as to be rotatable about the Y axis. Specifically, in the third conveyor 3c, a gap and a step generated between the front end of the third conveyor 3c and the rear end of the second conveyor 3b are reduced, that is, the rear end of the second conveyor 3b and the third conveyor 3c. It is connected to the upper rear end of the traveling unit 7 so that the distance from the front end is minimized. More specifically, since the position connected to the traveling section 7 of the third conveyor 3c is in the vicinity of the transport surface at the front end of the third conveyor 3c (just below the front end of the third conveyor 3c), The distance between the end and the front end of the third conveyor 3c is reduced.
The rear end of the third conveyor 3 c is supported on the upper portion of the first carriage 13. The first carriage 13 has a front wheel 13 a and a rear wheel 13 b, and the rear wheel 13 b is in contact with the traveling surface F. Thereby, the rear end of the third conveyor 3c can be arranged at a position higher than the traveling surface F by the height of the first carriage 13.

The first carriage 13 is connected to the lower rear end of the traveling unit 7 so as to be rotatable about the Y axis. Furthermore, the rear end of the third conveyor 3c can be moved relative to the first carriage 13 in the first direction.
With such a configuration, for example, when the device 1 travels on a traveling surface F having an inclination, the first carriage 13 rotates around the Y axis at the lower rear end of the traveling unit 7, and the third conveyor 3 c It rotates around the Y axis at the upper rear end of the traveling unit 7. At this time, the rear end of the third conveyor 3c moves relative to the first carriage 13 in the first direction, so that the first carriage 13 and the third conveyor 3c can smoothly rotate.

The front end (an example of the first end portion in the first direction) of the fourth conveyor 3d (an example of the first conveyor device) is supported on the upper portion of the first carriage 13. Specifically, in the upper part of the first cart 13, the front end of the fourth conveyor 3d is connected to the rear end of the third conveyor 3c by a connecting member (for example, a hook). This minimizes the distance between the front end of the fourth conveyor 3d and the rear end of the third conveyor 3c, that is, between the load transfer surface of the third conveyor 3c and the load transfer surface of the fourth conveyor 3d. Can be minimized.
The front end of the fourth conveyor 3d is relatively movable in the first direction while being supported from below by the first carriage 13.

The fifth conveyor 3e (an example of a second conveyor device) is a load discharging unit for an operator to take out a load during the devanning operation. As shown in FIGS. 1 and 2, the fifth conveyor 3 e is provided on the upper portion of the second carriage 15. The second carriage 15 has a front wheel 15 a and a rear wheel 15 b that are in contact with the traveling surface F. The fifth conveyor 3e is connected to the rear end of the fourth conveyor 3d (an example of the second end portion in the first direction) by a connection member 23 (described later) provided on the second carriage 15.
A second additional conveyor 3g (an example of an additional conveyor device) is connected to the rear end of the fourth conveyor 3d. Specifically, the front end of the second additional conveyor 3g is connected to the rear end of the fourth conveyor 3d so as to be rotatable about the Y axis. In the state where the rear end of the fourth conveyor 3d is connected to the second carriage 15, as shown in FIGS. 3 to 6, the rear end of the second additional conveyor 3g hangs down, and the load is conveyed by the fifth conveyor 3e. Touching the surface. Thereby, the load conveyance surface of the 4th conveyor 3d and the load conveyance surface of the 5th conveyor 3e can be connected by a small level | step difference.

As shown in FIGS. 4 and 6, the fifth conveyor 3 e is wider than the fourth conveyor 3 d in the second direction. Therefore, even if the fourth conveyor 3d is displaced in the second direction with respect to the fifth conveyor 3e, the load is reliably delivered from the fourth conveyor 3d to the fifth conveyor 3e. That is, the load does not fall.
A detent 31 is provided on the front side of the fifth conveyor 3e. Specifically, the rotation preventing portion 31 is a pair of members disposed on both sides in the second direction at the end of the second carriage 15 provided with the fifth conveyor 3e on the fourth conveyor 3d side. Specifically, the rotation stopper 31 is provided so as to protrude upward. As a modification, the rotation stopper may protrude upstream. As shown in FIGS. 7 to 9, when the connecting conveyor 21 is in the housed state, the rear end of the second additional conveyor 3g hangs down by its own weight between the pair of detents 31 in the second direction, thereby The rotation of the fourth conveyor 3d with respect to the fifth conveyor 3e is limited.

(3) Work table The work table 5 is a lifter disposed below the first conveyor 3a and on which an operator can ride. When an operator gets on the work table 5, the load can be placed on the first conveyor 3a.
The work table 5 extends long in the second direction. Therefore, when the first conveyor 3a is in the vicinity of the center position in the second direction of the work table 5, the operator can select any one of the second directions of the first conveyor 3a. You can also stand on the side.

  The work table 5 is movable in the vertical direction according to the position of the first conveyor 3a when an operator loads a load on the conveyor 3. As a structure for this purpose, the work table 5 is connected to the traveling unit 7 by a work table elevating unit (not shown). The work table elevating unit is a known technique for driving the work table 5 up and down, and includes a cylinder, a drive direction conversion mechanism, and the like. Thereby, the operator can move the work table 5 to a desired position above and below.

(4) Traveling unit The traveling unit 7 is a traveling device that travels on the traveling surface F. In the present embodiment, the traveling unit 7 can change the traveling direction by an operation of an operating device (no symbol).
The traveling unit 7 includes the first conveyor 3a and the second conveyor 3b, and connects the third conveyor 3c and the first carriage 13 to the rear end. Further, the second carriage 15 is connected to the fourth conveyor 3 d supported by the first carriage 13.
Thereby, while the traveling unit 7 travels on the traveling surface F, the first carriage 13 and the second carriage 15 connected to the traveling unit 7 move according to the traveling of the traveling unit 7, so that the apparatus 1 is connected to the first conveyor. 3a-5th conveyor 3e can be moved.

(5) Connection of 4th conveyor and 5th conveyor Using FIGS. 3-9, connection of 4th conveyor 3d (an example of a 1st conveyor apparatus) and 5th conveyor 3e (an example of a 2nd conveyor apparatus) is connected. explain. FIG. 3 is a schematic side view of a connecting conveyor (a load transportable state). FIG. 4 is a schematic plan view of a connection conveyor (a state in which a load can be conveyed). FIG. 5 is a schematic side view of a connecting conveyor (load transportable state). FIG. 6 is a schematic plan view of a connecting conveyor (a load transportable state). FIG. 7 is a schematic side view of the connection conveyor (stored state). FIG. 8 is a schematic plan view of a connecting conveyor (stored state). FIG. 9 is a schematic front view of a connecting conveyor (stored state).
The connection conveyor 21 is comprised by the 4th conveyor 3d and the 5th conveyor 3e. As shown in FIGS. 2 to 4, the connecting conveyor 21 is connected to a traveling carriage 20 including a traveling unit 7 that travels in the horizontal direction, a first conveyor 3 a, a second conveyor 3 b, a third conveyor 3 c, and the like. A subsequent conveyor 22 can be connected to the rear end of the connecting conveyor 21 as shown in FIG.

The connection conveyor 21 includes a connection member 23 that rotatably connects the fourth conveyor 3d and the fifth conveyor 3e. The fourth conveyor 3d can be rotated around the Z axis with respect to the fifth conveyor 3e by the connecting member 23 (described later), and the fourth conveyor 3d and the fifth conveyor 3e are arranged so as to overlap each other. 3d can rotate 180 degrees around the Z axis between the load transportable state and the stored state. In the load transportable state, as shown in FIGS. 3 to 6, the fourth conveyor 3 d extends from the fifth conveyor 3 e to the front side. In the stored state, as shown in FIGS. 7 to 9, the fourth conveyor 3d overlaps the upper side of the fifth conveyor 3e.
Specifically, the connecting member 23 is disposed between the fourth conveyor 3d and the fifth conveyor 3e in the height direction, and the fourth conveyor 3d and the fifth conveyor 3e can be rotated about the Y axis and the Z axis. Connect to. Thereby, the 4th conveyor 3d can be rotated to the periphery of the Y-axis in the connection member 23, as shown in FIG. That is, the fourth conveyor 3d can swing in the vertical direction. Furthermore, the 4th conveyor 3d can be rotated to Z-axis rotation in the connection member 23, as shown in FIG. Thereby, when the apparatus 1 meanders, it is hard to generate | occur | produce a stress in a connection location.

The connection member 23 will be described in detail with reference to FIGS. FIG. 10 is a front view of the connection member. FIG. 11 is a plan view of the connection member. FIG. 12 is a side view of the connection member.
The connection member 23 includes a first connection member 25, a second connection member 27, and a third connection member 29. The first connecting member 25 connects the second connecting member 27 and the fourth conveyor 3d to each other. The third connection member 29 connects the second connection member 27 and the fifth conveyor 3e to each other. The first connecting member 25 and the second connecting member 27 are pin-supported and connected so as to rotate relative to each other around the Y axis. The second connecting member 27 and the third connecting member 29 are pin-supported and connected so as to rotate relative to each other around the Z axis.

More specifically, the first connection member 25 is a pair of plate members fixed to the lower surface of the fourth conveyor 3d and arranged side by side in the second direction. The second connection member 27 is a block-shaped member disposed between a pair of plate members. One first connection member is pivotally connected to the second connection member 27 by a first pin 61. The other first connection member 25 is pivotally connected to the second connection member by a second pin 63. That is, both ends in the second direction of the second connection member 27 are supported by the first connection member 25.
The 3rd connection member 29 is a member fixed to the upper surface of the 5th conveyor 3e, and has the plate-shaped part 29a and the 3rd pin 29b extended upwards from there. The 3rd pin 29b is inserted in the hole 27a formed in the 2nd connection member 27, and is supporting the 2nd connection member 27 rotatably. A retaining member 65 is fixed to the upper end of the third pin 29b.

Initially, the load conveyance possible state of the connection conveyor 21 is demonstrated in detail. As shown in FIGS. 3 to 6, the fifth conveyor 3 e is located below the fourth conveyor 3 d and is partially in plan view with the rear end of the fourth conveyor 3 d (an example of the second end portion in the first direction). Overlap. Specifically, the rear end of the fourth conveyor 3d is disposed above the front end of the fifth conveyor 3e.
In this load transportable state, when the fourth conveyor 3d and the fifth conveyor 3e meander as shown in FIGS. 4 and 6, both rotate around the Z axis in the connecting member 23, so that the fourth conveyor 3d And a big stress does not generate | occur | produce in the connection part of the 5th conveyor 3e.
Moreover, in the state which can convey a load, since the 5th conveyor 3e is wide, even if it is the state from which the 4th conveyor 3d and the 5th conveyor 3e shifted | deviated during driving | running | working, a load can be conveyed.

Next, the storage state of the connection conveyor 21 will be described in detail. First, the fourth conveyor 3d is separated from the traveling carriage 20. Next, by rotating the fourth conveyor 3d with respect to the fifth conveyor 3e, the fourth conveyor 3d is placed so as to overlap the fifth conveyor 3e, thereby bringing the connection conveyor 21 into the storage state. In this case, as shown in FIGS. 7 to 9, the overlapping area of the fourth conveyor 3d and the fifth conveyor 3e becomes large. That is, in the stored state, the connecting conveyor 21 is compact with respect to the first direction.
Further, when the connecting conveyor 21 is in the housed state, as shown in FIGS. 7 to 9, the second additional conveyor 3 g automatically hangs down so that the rotation stopper 31 can be rotated within a predetermined angle range. Engage. That is, a special operation for preventing the fourth conveyor 3d from rotating with respect to the fifth conveyor 3e is unnecessary.

2. Features of the embodiment The embodiment can also be described as follows.
The connecting conveyor 21 (an example of a connecting conveyor) is connected to a traveling cart 20 (an example of a traveling cart) that travels in the horizontal direction, and includes a fourth conveyor 3d (an example of a first conveyor device) and a fifth conveyor. 3e (an example of a second conveyor device) and a connection member 23 (an example of a connection member).
The fourth conveyor 3d is a device that extends in the first direction and conveys the load in the first direction. The fourth conveyor 3d has a front end (an example of the first end in the first direction) connected to the traveling carriage 20.
The fifth conveyor 3e is located below the fourth conveyor 3d and partially overlaps the rear end of the fourth conveyor 3d (an example of the second end in the first direction) in plan view.
The connecting member 23 is disposed between the fourth conveyor 3d and the fifth conveyor 3e in the height direction, and connects the fourth conveyor 3d and the fifth conveyor 3e. The connecting member 23 enables the fourth conveyor 3d and the fifth conveyor 3e to rotate around the Y axis and the Z axis.
In this case, since the fourth conveyor 3d can rotate around the Z axis with respect to the fifth conveyor 3e, no great stress is generated at the connecting portion of the two conveyors when the both conveyors meander while traveling.

3. Other Embodiments Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention. In particular, a plurality of embodiments and modifications described in this specification can be arbitrarily combined as necessary.
The connecting conveyor can be applied to devices other than the vanning and devanning devices.
The connection member may have the attachment destination of the pin support structure around the Y axis and the pin support structure around the Z axis reversed.
The rear side width of the fifth conveyor may be narrower than the front side.

The fourth conveyor and the fifth conveyor may be capable of rotating 360 degrees.
The fourth conveyor and the fifth conveyor may be rotatable only within a predetermined angle range. For example, the fourth conveyor and the fifth conveyor may be capable of rotating, for example, 190 degrees only in one rotational direction from the storage state where they overlap each other. In this case, when it rotates 190 degrees, further rotation is restricted by the stopper. Thereby, in a load transportable state, when meandering occurs, for example, the fourth conveyor can turn to the left and right sides at a position of 180 degrees with respect to the fifth conveyor to release the stress. In addition, since it rotates only in one rotation direction from an accommodation state, it is sufficient to provide only one rotation stopper on the rotation direction side. The stopper may also be used as a rotation stopper.
As a configuration for maintaining the storage state, a recess may be provided in a part of the rollers of the fifth conveyor 3e, and in the storage state, a wheel provided at the front lower portion of the fourth conveyor 3d may be fitted into the recess. .

  The present invention can be widely applied to linked conveyors.

1: Vanning and devanning device 3: Conveyor 3a: 1st conveyor 3b: 2nd conveyor 3c: 3rd conveyor 3d: 4th conveyor 3e: 5th conveyor 5: Work table 7: Traveling part 13: 1st cart 15: 1st 2 carts 20: traveling cart 21: connecting conveyor 22: conveyor 23: connecting member 25: first connecting member 27: second connecting member 29: third connecting member 31: rotation stopper

Claims (4)

It is a connecting conveyor connected to a traveling cart that runs in the horizontal direction,
A first conveyor device that extends in a first direction and conveys a load in a first direction and has a first direction first end connected to the traveling carriage;
A second conveyor device located below the first conveyor device and partially overlapping the first direction second end of the first conveyor device in plan view;
It is arranged between the first conveyor device and the second conveyor device in the height direction, connects the first conveyor device and the second conveyor device, and connects the first conveyor device and the second conveyor device to the first conveyor device. A connecting member that is rotatable about an axis parallel to the second direction extending in the horizontal direction and intersecting one direction, and rotatable about an axis parallel to the third direction that is the vertical direction;
A connected conveyor. The connection member includes a first connection member, a second connection member, and a third connection member,
The first connection member connects the second connection member and the first conveyor device to each other,
The third connecting member connects the second connecting member and the second conveyor device to each other,
The first connection member and the second connection member are rotatable with respect to each other around an axis parallel to the second direction,
The connection conveyor according to claim 1, wherein the second connection member and the third connection member are rotatable with respect to each other around an axis parallel to the third direction.   The connected conveyor according to claim 1 or 2, wherein the second conveyor device is wider at least on the first conveyor device side in the second direction than the first conveyor device. An additional conveyor device connected to the first direction second end of the first conveyor device;
A detent provided at the first conveyor device side end in the first direction of the second conveyor device;
Further comprising
When the first conveyor device is rotated 180 degrees around an axis parallel to the third direction with respect to the second conveyor device, and the connected conveyor is in the storage state, the additional conveyor device and the The connection conveyor in any one of Claims 1-3 with which a rotation prevention part overlaps.

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