CN218986943U - Freight unmanned aerial vehicle - Google Patents

Abstract

The utility model belongs to the technical field of aviation, and relates to a freight unmanned aerial vehicle, which comprises an open cabin arranged on a machine body and a separated cargo cabin arranged in the open cabin, wherein the separated cargo cabin is detachably connected with the open cabin through a fixing assembly; by arranging the open cabin, the structural difficulty and the manufacturing cost of the unmanned aerial vehicle are reduced, the dead weight of the unmanned aerial vehicle is reduced, and the freight carrying capacity of the unmanned aerial vehicle is improved; simultaneously, the open cabin loading or unloading is simpler, more convenient and quicker, so that unmanned loading of the separated cargo hold can be realized, unmanned unloading can be completed through separation of the fixed assembly and the separated cargo hold, the loading and unloading efficiency of the unmanned aerial vehicle is improved, the transportation efficiency of the unmanned aerial vehicle is improved, and the cost is reduced.

Description

Freight unmanned aerial vehicle

Technical Field

The utility model belongs to the technical field of aviation, and relates to a freight unmanned aerial vehicle.

Background

Along with unmanned aerial vehicle technology development for terminal commodity circulation breaks away from ground and comes to the high altitude to become possible, when practicing thrift logistics personnel time cost, improves distribution efficiency, promotes logistics service level. The freight unmanned aerial vehicle is still in the early stage of development, and the existing freight unmanned aerial vehicle adopts two development ideas: firstly, unmanned reconstruction is carried out on a manned freight aircraft; second, complete re-development. In order to improve the transfer efficiency, the existing freight unmanned aerial vehicle adopts a mode of separating a cargo hold from a cabin, then loads the cargo hold into the cabin through a manual work or a transfer device, and unloads the cargo hold after reaching a destination, so that the transfer efficiency can be greatly improved, but the problem still exists:

1) The loading and unloading efficiency is low. And (3) loading process: the cargo holds are transported to a designated position (cabin tail) by a carrying device or manually, the cargo holds are moved into the cabin by a conveyor belt or other means, the cargo holds are carried one by one, and the cabin doors are closed after the cabin is filled; and (3) unloading process: the unmanned aerial vehicle is parked at a designated position, the cargo hold is conveyed to the door of the cabin through a driving belt in the cabin, and then the cargo hold is moved away by a cargo transport device or manually. Whether loading or unloading cargo, the cargo holds need to be transported to the designated positions by a transport device or manually, and then transported to the inside of the machine cabin one by one, which is inefficient.

2) And the unmanned aerial vehicle needs to be parked at a specific position during loading and unloading. When loading and unloading cargo tanks, unmanned aerial vehicles need to be parked at specified positions, and the positions are limited.

Disclosure of Invention

The utility model aims to solve the technical problems that the existing freight unmanned aerial vehicle is low in freight loading efficiency and cannot realize completely unmanned freight loading and unloading.

In order to solve the technical problems, the utility model provides a technical solution:

the cargo unmanned aerial vehicle is characterized by comprising an open cabin arranged on the aircraft body and a separated cargo hold arranged in the open cabin, wherein the separated cargo hold is detachably connected with the open cabin through a fixing assembly.

Further defined, the open cabin comprises a top plate and side plates, wherein the side plates are arranged on two opposite sides of the top plate to form a -shaped structure, the separated cargo hold is connected with the top plate and/or the side plates through a fixing assembly, and when the separated cargo hold is arranged in the open cabin, the top plate and the side plates are positioned on the outer sides of the separated cargo hold.

Further, the number of the divided cargo holds is plural, and the plural divided cargo holds are arranged in sequence along the length direction of the open type nacelle.

Further limited, the fixed subassembly is including setting up the mounting on the curb plate, the spout has been seted up on the roof, the spout sets up along the length direction of open cabin, the opposite both sides at separation type cargo hold top are provided with the slider with spout sliding connection, separation type cargo hold and roof sliding connection, separation type cargo hold passes through mounting and curb plate fastening connection.

Further limited, fixed subassembly includes connecting piece and 7 style of calligraphy pulley spare, offer on the roof with 7 style of calligraphy pulley spare sliding connection's L type joint platform, L type joint platform sets up along the length direction of open cabin, 7 style of calligraphy pulley spare sets up the relative both sides at separation type cargo hold top, separation type cargo hold and roof sliding connection, the connecting piece sets up on the curb plate, separation type cargo hold passes through connecting piece and curb plate fastening connection.

Further limited, the fixed subassembly includes ratchet couple and with ratchet couple ratchet end complex dog, the draw-in groove that matches with ratchet couple gear end is seted up to the opposite both sides of disconnect-type cargo hold, the connector has been seted up on the curb plate, be provided with the connecting axle with open cabin length direction syntropy in the connector, the ratchet couple passes through the connecting axle and rotates with the connector and be connected, the dog is located the top of ratchet couple, and the dog rotates with the connector to be connected, and the disconnect-type cargo hold passes through ratchet couple and is connected with open cabin.

Further defined, the cargo unmanned aerial vehicle further comprises a separated energy module, the separated energy module is identical to the separated cargo compartment in structure, the separated energy module is connected with the open type cabin through a fixing assembly, and the separated energy module and the plurality of separated cargo compartments are arranged along the length direction of the open type cabin.

The utility model has the beneficial effects that:

1. according to the utility model, through arranging the open cabin, on one hand, the structural complexity and the manufacturing cost of the unmanned aerial vehicle are reduced, and on the other hand, the dead weight of the unmanned aerial vehicle is reduced, and the freight carrying capacity of the unmanned aerial vehicle is improved, so that the transportation efficiency of the unmanned aerial vehicle is improved; meanwhile, the open type cabin is simpler, more convenient and quicker to load or unload.

2. The separated cargo hold can be loaded in the open type cabin in a sliding or clamping manner, so that the loading manner is simple, time and labor are saved, unmanned operation can be realized, the cost is saved, the loading and unloading efficiency is improved, the transportation efficiency is improved, and the transportation cost is reduced.

Drawings

FIG. 1 is a schematic cross-sectional front view of a cargo drone of the present utility model;

FIG. 2 is a schematic side cross-sectional view of the cargo drone of the present utility model when loaded;

FIG. 3 is a schematic view of a fixing assembly according to embodiment 1 of the present utility model;

FIG. 4 is a schematic view of a fixing assembly according to embodiment 2 of the present utility model;

FIG. 5 is a schematic view showing the structure of a fixing assembly in embodiment 3 of the present utility model;

FIG. 6 is a schematic diagram of a cargo handling drone of the present utility model;

FIG. 7 is a schematic illustration of the cargo drone of the present utility model;

1-a split cargo hold; 2-a fuselage; 3-an open nacelle; 4-top plate; 5-side plates; 6-a split energy module; a-a fixing piece; b-a chute; c-a slider; d-a connecting piece; e-7 shaped pulley members; f-L type clamping table; g-a ratchet hook; h-a locking claw; i-a clamping groove; j-connection port.

Detailed Description

Example 1

Referring to fig. 1 and 2, this embodiment provides a cargo unmanned aerial vehicle, this cargo unmanned aerial vehicle is a sliding unmanned aerial vehicle or a vertical take-off and landing unmanned aerial vehicle, take the sliding unmanned aerial vehicle as an example, there are wings and aircraft nose on the fuselage 2 of the cargo unmanned aerial vehicle, open cabin 3 is located the belly position of fuselage 2, open cabin 3 is open, open cabin 3 bottom face while open cabin 3 tail end no cabin door, open cabin 3 inside can with external direct contact, the cargo only needs to be connected in open cabin 3 at this moment can realize the cargo and load the transportation that carries out in open cabin 3, cost and dead weight of cargo unmanned aerial vehicle have been reduced, cargo unmanned aerial vehicle's transportation ability and transportation efficiency have been improved.

In order to avoid the increase of the loading and unloading difficulty of the cargo unmanned aerial vehicle due to the fact that different-sized cargoes are connected with the open type cabin 3, the cargo is preferably loaded in the separated type cabin 1, the open type cabin 3 is connected with the separated type cabin 1 during transportation, and accordingly the cargo transportation is achieved through the fact that the separated type cabin 1 is directly connected with the open type cabin 3, the separated type cabin 1 is designed according to the size of the inner end face of the open type cabin 3, the plurality of separated type cabins 1 are sequentially placed in the open type cabin 3 along the length direction of the open type cabin 3, the separated type cabins 1 at the tail end of the open type cabin 3 are matched with the separated type cabins 1 of corresponding sizes according to the model number of the cargo unmanned aerial vehicle, the plurality of separated type cabins 1 are sequentially contacted to form a separated type cabin group, the bottoms of the separated type cabins 1 are flush with the bottom of the open type cabin 3, and the separated type cabins 1 at the tail end of the open type cabin 3 are flush with the tail end of the open type cabin 3, and accordingly the separated type cabin 1 and the open type cabin 3 form a sealed type fuselage.

Because the cargo unmanned aerial vehicle has different amounts or weights or distances each time the cargo unmanned aerial vehicle is loaded, the required electric quantity or oil quantity of the cargo unmanned aerial vehicle is different, if a large battery or a large oil tank is used for transporting the cargo at a short distance and a large weight, the dead weight of the cargo unmanned aerial vehicle is increased, and the transport capacity of the cargo unmanned aerial vehicle is reduced, the cargo unmanned aerial vehicle further preferably further comprises a separated energy module 6, wherein the separated energy module 6 is a battery or an oil tank with different thicknesses, the size is the same as the cross section of the side end of the open cabin 3, the separated energy module 6 with different specifications can be matched according to the transport plan of the cargo unmanned aerial vehicle, and the same separated energy module 6 is connected in the open cabin 3, so that the separated energy module 6 and the separated cargo cabin 1 are simultaneously connected in the open cabin 3 for transport, and the separated energy module 6 is preferably arranged on one side of the open cabin 3 close to the machine head in order to avoid frequent disassembly.

In order to ensure that the separate cargo compartment is stably connected with the open type cabin 3 during transportation, the separate cargo compartment 1 is connected with the open type cabin 3 through a fixing assembly, the open type cabin 3 comprises a top plate 4 and side plates 5, and the side plates 5 are positioned on two opposite sides of the top plate 4, so that the open type cabin 3 forms a -shaped structure; referring to fig. 3, the fixing assembly includes a fixing member a provided on a side plate 5, a sliding groove b provided on a top plate 4, the sliding groove b being provided at opposite sides of the top plate 4, and the sliding groove b being provided along a length direction of the open type cabin 3, the sliding groove b having a rectangular or square or sector-shaped or trapezoid-shaped cross section, for example, a bottom surface of the sliding groove b being flush with a lower surface of the top plate 4, while for facilitating connection of the separate type cabin 1 with the open type cabin 3, opposite sides of a top of the separate type cabin 1 are selectively provided with a sliding member c, the sliding member c being matched with the sliding groove b, so that the separate type cabin 1 can be slidably connected with the sliding groove b on the top plate through the sliding member c, in order to ensure that the separate type cabin 1 is stably connected with the open type cabin 3 without dropping, the fixing member a is provided on the side plate 5, one end of the fixing member a is provided on an outer side of the side plate 5, and the other end of the fixing member a is extended to an inner side of the top plate 4 through the side plate 5 and the sliding member c, so that the separate type cabin 1 is connected with the fixing member a through the sliding member c to the fixing member a to realize stable connection of the separate type cabin 1 with the open type cabin 3.

When loading, only the sliding part c of the separated cargo hold 1 is matched with the sliding groove b on the open type cabin 3, so that the separated cargo hold 1 can slide from the tail end of the open type cabin 3 to the head end of the open type cabin 3, the separated cargo hold 1 is sequentially contacted with the head end and the tail end, time and labor are saved, and when the separated cargo hold 1 slides in place, the separated cargo hold 1 is connected with the open type cabin 3 through the fixing part a, and loading is completed; when unloading, the separated cargo hold 1 can be slid out of the open type cabin 3 in sequence to finish unloading only after the fixing piece a is removed, so that the unloading is simple and quick; since the slide groove b cannot be engaged with the slider c, it is necessary to carry the split cargo tank 1 to slide along the longitudinal direction of the open nacelle 3 by using a moving cart at the time of loading and unloading.

Meanwhile, as the sliding piece c can move up and down in the sliding groove b, the separated cargo hold 1 can also ascend into the open type cabin 3 from the bottom of the open type cabin 3, so that the sliding piece c stretches into the sliding groove b, then the separated cargo hold 1 is fixedly connected with the open type cabin 3 through the fixing piece a, at the moment, a lifting table is required to be arranged at the bottom of the machine body 2, so that the separated cargo hold 1 can be placed on the top of the lifting table when the lifting table falls down, and after the lifting table is lifted, the separated cargo hold 1 is lifted into the open type cabin 3 and then connected with the open type cabin 3 through the fixing piece a, so that loading is completed; when unloading, the lifting platform is only required to be moved to the lower part of the machine body 2, the lifting platform is lifted and is contacted with the separated cargo hold 1, and then the lifting platform is lowered to finish the unloading of the separated cargo hold 1 after the fixing piece a is detached, so that the operation is simple and convenient, and the time and the labor are saved.

Example 2

Referring to fig. 4, the present embodiment provides a cargo transportation type unmanned aerial vehicle, unlike embodiment 1, in which the fixing assembly includes a connection member d and a 7-shaped pulley member e, an L-shaped clamping table f slidably connected to the 7-shaped pulley member e is provided on the top plate 4, the L-shaped clamping table f is provided along a longitudinal direction of the open type cabin 3, the L-shaped clamping table f is located between the top plate 4 and the side plate 5, a pulley is provided on a short side of the 7-shaped pulley member e, the 7-shaped pulley member e can be slidably connected to the L-shaped clamping table f by contacting the pulley with a short side top of the L-shaped clamping table f, a gap is provided between the side plate 5 and the top plate 4, a long side of the 7-shaped pulley member e can be moved along the gap, a bottom of the long side of the 7-shaped pulley member e is connected to a fixed top of the separate type cabin 1, and the 7-shaped pulley member e is provided on opposite sides of the top of the separate type cabin 1, thereby enabling the separate type cabin 1 to slide in the open type cabin 3, and also limiting up-down movement of the separate type cabin 1.

In order to further ensure that the cargo hold 1 can be stably connected when the cargo unmanned aerial vehicle is transported, the side plate 5 is provided with the connecting groove, the liquid level T-shaped structure of the connecting groove is arranged in the same direction, the short side section of the connecting groove is far away from the top plate 4, the long side section of the connecting groove penetrates through the side plate 5 and is opposite to the side part of the top plate 4, the connecting piece d is horizontally arranged, one end of the connecting piece d is connected with the 7-shaped pulley piece e, the other end of the connecting piece d penetrates through the long side section of the connecting groove and is positioned at the short side section of the connecting groove, when the cargo hold 1 slides in the open cabin 3, the 7-shaped pulley piece e is in sliding connection with the L-shaped clamping table f, the connecting piece d is in sliding connection with the connecting groove, and the connecting piece d is fastened with the side plate 5 after the connecting piece d is fastened, so that the cargo hold 1 can not slide in the open cabin 3, and meanwhile, the cargo hold 1 can be stably connected with the open cabin 3 through the support of the L-shaped pulley piece f and the connecting groove.

In use, unlike in embodiment 1, the split cargo compartment 1 may not need to be supported by a mobile cart when slid with the open nacelle 3, but it is preferable to slide in the open nacelle 3 after the split cargo compartment 1 is placed on the mobile cart in order to enhance the structural strength and service life of the fixed assembly.

Example 3

Referring to fig. 5, this embodiment provides a cargo unmanned aerial vehicle, unlike embodiment 1 and embodiment 2, the fixing assembly includes a ratchet hook g and a stopping claw h, the top end of the ratchet hook g is a ratchet, the bottom of the ratchet hook g is a hook, a shaft hole is formed in the center of the ratchet, so that the ratchet hook g can rotate around the shaft hole, the stopping claw h is mounted on the top of the ratchet hook g, so that the ratchet hook g and the stopping claw h form a ratchet mechanism, and the rotation restriction of the ratchet hook g is realized through the stopping control of the ratchet.

The fixed subassembly sets up in the opposite both sides of roof 4 equally for fixed subassembly equidistant setting along the length direction of open cabin 3, for convenient maintenance, set up connector j on curb plate 5, set up the connecting axle on connector j, the connecting axle sets up along the length direction of open cabin 3, and ratchet couple g's shaft hole rotates with the connecting axle to be connected, makes ratchet couple g can rotate around the connecting axle.

The clamping grooves i are formed in the two opposite sides of the separation type cargo hold 1, and when the separation type cargo hold 1 is connected with the open type cabin 3, the clamping grooves i on the separation type cargo hold 1 are clamped with the gear ends of the ratchet hooks g, so that the separation type cargo hold 1 is stably installed in the open type cabin 3.

When loading, the separated cargo hold 1 can lift the separated cargo hold 1 into the open cabin 3 through the lifting table, the gear end of the ratchet hook g is clamped with the clamping groove i after the locking claw h is lifted, and the locking claw h is put down to limit the rotation of the ratchet hook g, so that the stable connection of the separated cargo hold 1 is ensured; the loading of the separate cargo tanks 1 may also be accomplished by pushing the separate cargo tanks 1 into the open type nacelle 3 along the length direction of the open type nacelle 3 using a horizontal cart, and then coupling the separate cargo tanks 1 by means of ratchet hooks g.

In unloading, the top of the lifting platform or the top of the moving platform is contacted with the bottom of the separated cargo compartment 1, the ratchet hook g is rotated to separate the separated cargo compartment 1 from the open type cabin 3 after the stop pawl h is lifted, so that the moving trolley is pushed or the lifting platform is lowered to separate the separated cargo compartment 1 from the open type cabin 3, and unloading is completed.

Example 4

Referring to fig. 6, in combination with the cargo unmanned aerial vehicle described in embodiments 1 to 3, the present embodiment provides a cargo loading method of the cargo unmanned aerial vehicle, including the following steps:

1) Preparing goods;

according to the size of an open cabin 3 of the cargo unmanned aerial vehicle, preparing a separated cargo cabin group with the same size as the open cabin 3, wherein the separated cargo cabin group comprises a plurality of separated cargo cabins 1 which are sequentially contacted along the horizontal direction, and the separated cargo cabins 1 are filled with cargos;

2) Preparing cargo loading;

placing the separated cargo compartment group on a loading apron;

3) Landing of the freight unmanned aerial vehicle;

the freight unmanned aerial vehicle falls to the position right above or right in front of the goods loading field, so that the bottom of the open cabin 3 is opposite to the top of the separated cargo compartment group or the tail end of the open cabin 3 is opposite to the side end of the separated cargo compartment group;

4) Loading goods;

the separate cargo hold assembly is loaded in the open cabin 3 and the separate cargo hold 1 of the separate cargo hold assembly is connected to the open cabin 3 by means of a securing assembly.

Step 2) cargo loading preparation specifically comprises:

placing a mobile cart on a loading yard, and placing a separated cargo compartment set on top of the mobile cart;

or a lift table is placed on the loading dock and a separate cargo compartment set is placed on top of the lift table.

The step 3) of landing the freight unmanned aerial vehicle is specifically as follows:

when the mobile cart is placed on the goods yard plateau, the freight unmanned aerial vehicle falls to the right front of the goods yard plateau, so that the mobile cart and the open cabin 3 are arranged in the same direction;

when the lifting platform is placed on the goods yard plateau, the freight unmanned aerial vehicle falls to the position right above the goods yard plateau, so that the bottom port of the open cabin 3 is opposite to the top of the lifting platform.

Step 4) cargo loading specifically comprises:

when the freight unmanned aerial vehicle falls to the right front of the goods loading apron and the mobile cart and the open cabin 3 are arranged in the same direction, pushing the separated cargo compartment group on the mobile cart into the open cabin 3 along the length direction of the open cabin 3, and then fastening and connecting the separated cargo compartment group with the open cabin 3 through a fixing assembly;

when the cargo drone drops directly above the loading apron such that the bottom port of the open cabin 3 is aligned with the top of the lifting platform, the lifting platform is lifted to lift the split cargo compartment set on the lifting platform into the open cabin 3, and then the split cargo compartment set is securely connected to the open cabin 3 by the securing assembly.

Example 5

In combination with the cargo unmanned aerial vehicle described in embodiments 1 to 3, the embodiment provides a cargo unmanned aerial vehicle unloading method, which includes the following steps:

1) Preparing for unloading;

placing a movable trolley or a lifting platform on a goods yard;

2) Landing of freight unmanned aerial vehicle

When the mobile cart is placed on the goods yard plateau, the freight unmanned aerial vehicle falls to the right front of the goods yard plateau, so that the mobile cart and the open cabin 3 are arranged in the same direction;

when a lifting platform is placed on the goods loading field plat, the freight unmanned aerial vehicle falls to the position right above the goods loading field plat, so that the bottom port of the open cabin 3 is opposite to the top of the lifting platform;

3) Cargo unmanned aerial vehicle unloading

When the freight unmanned aerial vehicle falls to the right front of the goods loading field so that the movable trolley and the open cabin 3 are arranged in the same direction, the movable trolley is moved to the bottom of the separated type cargo cabin group, the separated type cargo cabin group is separated from the open cabin 3 by releasing the fixing component, and then the separated type cargo cabin group falls on the top of the movable trolley;

when the cargo drone drops directly above the loading apron such that the bottom port of the open cabin 3 is aligned with the top of the lift, the split cargo compartment set is separated from the open cabin 3 by releasing the securing assembly, and then the lift is lowered after the split cargo compartment set falls on top of the lift.

The unloading mode is simple and quick, no staff is needed to operate, time is saved, cost is reduced, waiting time of the freight unmanned aerial vehicle is reduced, and unloading efficiency is improved.

Claims (7)

1. The cargo unmanned aerial vehicle is characterized by comprising an open cabin (3) arranged on a fuselage (2) and a separated cargo hold (1) arranged in the open cabin (3), wherein the separated cargo hold (1) is detachably connected with the open cabin (3) through a fixing assembly.

2. Freight unmanned aerial vehicle according to claim 1, wherein the open cabin (3) comprises a roof (4) and side plates (5), the side plates (5) are arranged on opposite sides of the roof (4) to form a -shaped structure, the separate cargo compartment (1) is connected with the roof (4) and/or the side plates (5) through a fixing assembly, and when the separate cargo compartment (1) is arranged in the open cabin (3), the roof (4) and the side plates (5) are both positioned outside the separate cargo compartment (1).

3. A cargo drone according to claim 2, wherein the number of separate cargo holds (1) is plural, the plural separate cargo holds (1) being arranged in sequence along the length of the open nacelle (3).

4. The cargo unmanned aerial vehicle according to claim 2, wherein the fixing assembly comprises a fixing piece (a) arranged on the side plate (5), a sliding groove (b) is formed in the top plate (4), the sliding groove (b) is formed in the length direction of the open cabin (3), sliding pieces (c) which are in sliding connection with the sliding groove (b) are arranged on two opposite sides of the top of the separated cargo compartment (1), the separated cargo compartment (1) is in sliding connection with the top plate (4), and the separated cargo compartment (1) is in fastening connection with the side plate (5) through the fixing piece (a).

5. The cargo unmanned aerial vehicle according to claim 2, wherein the fixing assembly comprises a connecting piece (d) and a 7-shaped pulley piece (e), an L-shaped clamping table (f) which is slidably connected with the 7-shaped pulley piece (e) is arranged on the top plate (4), the L-shaped clamping table (f) is arranged along the length direction of the open cabin (3), the 7-shaped pulley piece (e) is arranged on two opposite sides of the top of the separated cargo compartment (1), the separated cargo compartment (1) is slidably connected with the top plate (4), the connecting piece (d) is arranged on the side plate (5), and the separated cargo compartment (1) is fixedly connected with the side plate (5) through the connecting piece (d).

6. The cargo unmanned aerial vehicle according to claim 2, wherein the fixing component comprises a ratchet hook (g) and a locking claw (h) matched with the ratchet end of the ratchet hook (g), clamping grooves (i) matched with the gear end of the ratchet hook (g) are formed in two opposite sides of the separated cargo compartment (1), a connecting port (j) is formed in the side plate (5), a connecting shaft in the same direction as the length direction of the open type cabin (3) is arranged in the connecting port (j), the ratchet hook (g) is rotationally connected with the connecting port (j) through the connecting shaft, the locking claw (h) is located at the top of the ratchet hook (g), the locking claw (h) is rotationally connected with the connecting port (j), and the separated cargo compartment (1) is connected with the open type cabin (3) through the ratchet hook (g).

7. The cargo unmanned aerial vehicle according to any one of claims 2 to 5, further comprising a separate energy module (6), wherein the separate energy module (6) has the same structure as the separate cargo compartment (1), the separate energy module (6) is connected to the open cargo compartment (3) by a fixing assembly, and the separate energy module (6) and the plurality of separate cargo compartments (1) are arranged along the length direction of the open cargo compartment (3).

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