A drone cargo docking system

Abstract

This invention relates to the field of low-altitude economy, and more particularly to a drone cargo compartment docking system, comprising a detachable cargo compartment and a cargo compartment docking station. The detachable cargo compartment is connected to a logistics drone via an intermediate connector, and the mating surfaces of the intermediate connector and the detachable cargo compartment are connected by a padlock structure. After the cargo compartment is separated from the drone, it can be vertically transported downwards from the drone's take-off and landing platform to a lower space and horizontally pushed to a designated location via the cargo compartment docking station. It can also perform reverse cargo retrieval operations from the lower space to the upper space, completing the cargo compartment transfer task between the drone's take-off and landing platform and the logistics warehouse. This invention features a novel design, greatly improving the automated operation efficiency of drone community logistics systems, and has high application value as an important piece of equipment in drone community logistics and support systems.

Description

Technical Field

[0001] This invention relates to the field of low-altitude economy, and more particularly to a drone cargo docking system. Background Technology

[0002] With the gradual implementation of the low-altitude economy, drone-based community logistics is developing rapidly, and some large logistics companies have already taken the lead in deploying community logistics systems. In these systems, standardized drone-mounted, detachable cargo compartments will be widely used as transport carriers, and automated cargo compartment docking has become a key technology. Currently, when drones perform logistics tasks, cargo compartments are mostly manually attached and detached, which is time-consuming, labor-intensive, and inefficient, hindering automated logistics operations. Manual docking and unloading significantly impacts the automation process of community logistics systems. With the rapid deployment of unmanned community logistics systems, unmanned logistics stations are quietly emerging, creating an urgent need for numerous drone logistics docking points to complete cargo compartment docking and transfer. The automatic attachment and release of detachable drone cargo compartments, and the transfer of cargo compartments from logistics drones to pickup warehouses, are two major technical challenges for unmanned community logistics systems. Summary of the Invention

[0003] In view of the above problems, the purpose of this invention is to provide a drone cargo compartment docking system, and the present invention adopts the following technical solution:

[0004] This invention provides a drone cargo docking system, comprising:

[0005] Separate cargo hold;

[0006] An intermediate connector connects the logistics drone and the separate cargo compartment. The mating surfaces of the intermediate connector and the separate cargo compartment are connected by a padlock structure. The padlock structure includes a locking bar and a locking hook assembly. The locking hook assembly locks or unlocks with the locking bar under the action of a driving locking device.

[0007] The cargo hold docking station includes a lifting mechanism, a pushing mechanism, and a docking container; both the pushing mechanism and the lifting mechanism are installed inside the docking container; after the lifting mechanism carries the detachable cargo hold to a certain height, the pushing mechanism transfers the detachable cargo hold and pushes it horizontally to a designated position.

[0008] Preferably, the intermediate connector includes a body, and four fasteners and four connecting holes are arranged around the body;

[0009] The intermediate connector is fixed to the logistics drone by four fasteners and is connected to the landing gear of the logistics drone by four connection holes.

[0010] Preferably, the locking bar is fixed in the mounting groove on the bottom surface of the intermediate connector, and the locking hook assembly and the drive locking device are installed in the mounting groove on the top of the split cargo compartment;

[0011] The number of locking bars is two;

[0012] The locking hook assembly includes two rotating locking hooks arranged symmetrically away from each other. The rotating locking hooks are engaged with corresponding locking bar hooks. The front end of the rotating locking hook is fixed with a front support shaft, and the rear end is fixed with a rear support shaft. Both the front support shaft and the rear support shaft are rotatably connected to the corresponding bearing seats.

[0013] The drive locking device includes a coupling and a drive servo motor, and the drive servo motor is poweredly connected to the rear support shaft through the coupling.

[0014] Preferably, the drive locking device further includes a lead screw servo, a locking plate, and a locking pin. The lead screw servo is installed in the mounting slot on the top of the split cargo compartment. A lead screw is fixed on the drive shaft of the lead screw servo, and the lead screw is threadedly connected to the locking plate. The locking plate is slidably connected to the two front support shafts. The locking plate is provided with a locking hole. A locking pin is fixed to the front end of the rotating locking hook, and the locking pin is inserted into the locking hole.

[0015] Preferably, a dustproof plate is provided on the mounting groove on the top of the split cargo compartment, and the dustproof plate has a hollow structure corresponding to the position of the rotary lock hook.

[0016] Preferably, the mating surfaces of the intermediate connector and the separate cargo compartment are precisely positioned vertically through a positioning structure;

[0017] The positioning structure includes multiple positioning hole assemblies and multiple positioning pins, wherein the positioning pins and the positioning hole assemblies are inserted into each other in a one-to-one correspondence.

[0018] The positioning pin is located on the top of the split cargo compartment, and the positioning hole assembly is located on the intermediate connector;

[0019] The positioning hole assembly includes a positioning hole provided on the intermediate connector. Both ends of the positioning hole are fixed with guide sleeves. A buffer rod that can slide up and down is provided between the two guide sleeves. A spring is sleeved on the buffer rod. The lower end of the spring presses on the base of the buffer rod, and the upper end of the spring presses on the upper guide sleeve.

[0020] Preferably, the lifting mechanism includes a cargo hold pallet, which is movably connected to a linkage seat via a cross linkage assembly. A first drive electric cylinder is provided on the linkage seat, and the telescopic end of the first drive electric cylinder is connected to the movable end of the cross linkage assembly. A vertically arranged vertical guide rod is fixed on the linkage seat, and the upper end of the vertical guide rod is connected to the docking box via a guide rod fixing seat. A linear bearing is slidably connected to the vertical guide rod, and the linear bearing is fixed on the cargo hold pallet.

[0021] Preferably, the pushing mechanism includes two movable side plates, which are respectively arranged on both sides of the lifting mechanism; both sides of the movable side plates are connected to the connecting box through guide sliding components, and a second drive electric cylinder is provided below the movable side plate, with the extension and retraction end of the second drive electric cylinder connected to the movable side plate.

[0022] The movable side panel has a linear module on the side near the lifting mechanism. The linear module has a cargo hold bracket on its slide. Both sides of the split cargo hold have support bars, and the cargo hold bracket cooperates with the support bars for support.

[0023] Preferably, the cargo hold bracket is provided with a rectangular cargo hold positioning groove, and the bottom of the support bar is provided with a positioning protrusion. The positioning protrusion is embedded and cooperates with the rectangular cargo hold positioning groove to prevent the cargo hold from slipping during the transfer process.

[0024] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0025] This invention achieves the attachment and locking of the drone cargo compartment through a reliable mechanical structure, innovatively solving the problem of low transportation efficiency caused by manual loading and unloading of cargo compartments. Simultaneously, a unique combination of mechanisms enables efficient transportation of the cargo compartment between the cargo compartment delivery port on the take-off and landing platform and the lower-level enclosed logistics warehouse, providing a solution for the automation and unmanned operation of drone community logistics connection points. This invention features a novel design, greatly improving the automated operation efficiency of drone community logistics systems, and as an important piece of equipment in drone community logistics and support systems, it has high application value. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] Figure 1 This is a schematic diagram of the structure of the UAV cargo compartment docking system of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the intermediate connector of the present invention;

[0029] Figure 3This is a schematic diagram showing the connection between the detachable cargo compartment and the intermediate connector of the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of the present invention, in which the locking bar is disposed on the intermediate connector.

[0031] Figure 5 This is a schematic diagram of the structure of the locking hook assembly of the present invention installed on the top of a split cargo hold.

[0032] Figure 6 This is a top view of the top of the detachable cargo hold of the present invention;

[0033] Figure 7 This is an exploded view of the drive locking device and the locking hook assembly of the present invention;

[0034] Figure 8 This is a cross-sectional view of the positioning hole assembly of the present invention;

[0035] Figure 9 This is a schematic diagram of the positioning hole assembly and positioning pin of the present invention.

[0036] Figure 10 This is a schematic diagram of the cargo hold docking station of the present invention;

[0037] Figure 11 This is a schematic diagram of the lifting mechanism of the present invention driving the detachable cargo compartment to descend.

[0038] Figure 12 This is a schematic diagram of the push mechanism of the present invention pushing out the detachable cargo compartment;

[0039] Figure 13 This is a schematic diagram showing the arrangement of the lifting mechanism and the pushing mechanism of the present invention;

[0040] Figure 14 This is a schematic diagram of the lifting mechanism of the present invention;

[0041] Figure 15 This is a front view of the lifting mechanism of the present invention;

[0042] Figure 16 This is a schematic diagram of the pushing mechanism of the present invention;

[0043] Figure 17 This is a schematic diagram of the support bar of the present invention being disposed on the detachable cargo side.

[0044] Explanation of reference numerals in the attached drawings: 1. Separate cargo hold; 2. Intermediate connector; 201. Body; 202. Fastener; 203. Connecting hole; 3. Locking bar; 4. Locking hook assembly; 401. Rotary locking hook; 402. Front support shaft; 403. Rear support shaft; 404. Bearing seat; 5. Drive locking device; 501. Coupling; 502. Drive servo motor; 503. Screw servo motor; 504. Locking plate; 505. Locking pin; 506. Screw; 507. Locking hole; 6. Cargo hold docking station; 601. Lifting mechanism; 601-1. Cargo hold pallet; 601-2. Cross linkage assembly; 601-3. Connecting... 601-4, First drive electric cylinder; 601-5, Vertical guide rod; 601-6, Guide rod fixing seat; 601-7, Linear bearing; 602, Pushing mechanism; 602-1, Movable side plate; 602-2, Guide sliding assembly; 602-3, Second drive electric cylinder; 602-4, Linear module; 602-5, Cargo hold bracket; 602-6, Rectangular cargo hold positioning groove; 603, Connecting box; 7, Dustproof plate; 8, Positioning hole assembly; 801, Positioning hole; 802, Guide sliding sleeve; 803, Buffer rod; 804, Spring; 9, Positioning pin; 10, Support bar; 1001, Positioning protrusion. Detailed Implementation

[0045] To make the technical problems, technical solutions, and beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0046] like Figure 1 As shown in the figure, this embodiment discloses a drone cargo compartment docking system, comprising a separate cargo compartment 1 and a cargo compartment docking station 6.

[0047] The detachable cargo compartment 1 is connected to the logistics drone via an intermediate connector 2. The mating surfaces between the intermediate connector 2 and the detachable cargo compartment 1 are connected by a padlock structure, which enables the attachment and detachment of the cargo compartment. After the cargo compartment is separated from the drone and the intermediate connector 2, it can be transported vertically downwards from the drone landing platform to the lower space and then horizontally pushed to a designated location via the cargo compartment transfer station 6. It can also perform reverse cargo retrieval operations from the lower space to the upper space, completing the transfer task of the cargo compartment between the drone landing platform and the logistics warehouse.

[0048] like Figure 2 As shown, the intermediate connector 2 includes a body 201, and four fasteners 202 and four connecting holes 203 are arranged around the body 201. The intermediate connector 2 is fixed to the logistics drone by the four fasteners 202 and connected to the landing gear of the logistics drone by the four connecting holes 203.

[0049] like Figures 3 to 5As shown, the padlock structure includes a locking bar 3 and a locking hook assembly 4. The locking hook assembly 4 is locked or unlocked from the locking bar 3 under the action of the driving locking device 5.

[0050] In this embodiment, the locking bar 3 is fixed in the mounting groove on the bottom surface of the intermediate connector 2, and the locking hook assembly 4 and the drive locking device 5 are installed in the mounting groove on the top of the split cargo compartment 1.

[0051] like Figure 6 and 7 As shown, the locking hook assembly 4 includes two rotating locking hooks 401 arranged symmetrically away from each other, and two corresponding locking bars 3. The rotating locking hooks 401 are hooked and engaged with the corresponding locking bars 3. The front end of the rotating locking hook 401 is fixed with a front support shaft 402, and the rear end is fixed with a rear support shaft 403. Both the front support shaft 402 and the rear support shaft 403 are rotatably connected to the corresponding bearing seats 404.

[0052] The drive locking device 5 includes a coupling 501 and a drive servo motor 502, which is poweredly connected to the rear support shaft 403 via the coupling 501. Both the bearing housing 404 and the drive servo motor 502 are installed in mounting slots on the top of the separable cargo compartment 1.

[0053] The drive locking device 5 also includes a lead screw servo motor 503, a locking plate 504, and a locking pin 505. The lead screw servo motor 503 is installed in the mounting slot on the top of the split cargo compartment 1. A lead screw 506 is fixed on the drive shaft of the lead screw servo motor 503. The lead screw 506 is threadedly connected to the locking plate 504. The locking plate 504 is slidably connected to the two front support shafts 402. The locking plate 504 is provided with a locking hole 507. The front end of the rotating locking hook 401 is fixed with a locking pin 505. The locking pin 505 is inserted into the locking hole 507.

[0054] During operation, the two sets of drive servo motors 502 drive the two sets of rotary locking hooks 401 to rotate in opposite directions via coupling 501. When the rotary locking hook 401 is hooked on the locking bar 3, the separate cargo compartment 1 is engaged with the intermediate connector 2; when the rotary locking hook 401 is disengaged from the locking bar 3, the separate cargo compartment 1 is separated from the intermediate connector 2.

[0055] The locking function is achieved by the locking plate 504 and the locking pin 505. The locking plate 504 moves axially under the drive of the lead screw servo motor 503, realizing the engagement and disengagement of the locking hole 507 and the locking pin 505. When the locking hole 507 on the locking plate 504 engages with the locking pin 505, the rotary locking hook 401 is locked, and the two sets of locking hooks 0221 are locked with the locking bar 3. At this time, the connection between the separate cargo compartment 1 and the intermediate connector 2 is locked. When the locking hole 507 on the locking plate 504 separates axially from the locking pin 505, the rotary locking hook 401 is unlocked under the drive of the drive servo motor 502. At this time, the separate cargo compartment 1 and the intermediate connector 2 are unlocked and separated.

[0056] In this embodiment, a dustproof plate 7 is provided on the mounting groove at the top of the split cargo compartment 1, and the dustproof plate 7 has a hollow structure corresponding to the position of the rotating lock hook 401.

[0057] like Figure 3 As shown, the mating surfaces of the intermediate connector 2 and the separate cargo compartment 1 are precisely positioned vertically through a positioning structure; the positioning structure includes multiple positioning hole assemblies 8 and multiple positioning pins 9, and the positioning pins 9 and the positioning hole assemblies 8 are inserted and mated in a one-to-one correspondence.

[0058] In this embodiment, the positioning pin 9 is disposed on the top of the split cargo compartment 1, and the positioning hole assembly 8 is disposed on the intermediate connector 2.

[0059] like Figure 8 and 9 As shown, the positioning hole assembly 8 includes a positioning hole 801 provided on the intermediate connector 2. Both ends of the positioning hole 801 are fixed with guide sleeves 802. A buffer rod 803 that can slide up and down is provided between the two guide sleeves 802. A spring 804 is sleeved on the buffer rod 803. The lower end of the spring 804 presses on the base of the buffer rod 803, and the upper end of the spring 804 presses on the upper guide sleeve 802.

[0060] When the separate cargo compartment 1 is connected to the intermediate connector 2, the positioning pin 9 must first be inserted into the positioning hole assembly 8 on the intermediate connector 2. That is, after the positioning pin 9 is inserted into the guide sleeve 802, it rests against the buffer rod 803. Since there will inevitably be impact during automatic docking, the buffer rod 803 and the spring 804 play a buffering and energy absorption role.

[0061] like Figures 10 to 13 As shown, the cargo hold transfer station 6 includes a lifting mechanism 601, a pushing mechanism 602, and a transfer box 603; both the pushing mechanism 602 and the lifting mechanism 601 are installed inside the transfer box 603; after the lifting mechanism 601 carries the separate cargo hold 1 to a certain height, the pushing mechanism 602 transfers the separate cargo hold 1 and pushes it horizontally to the designated position (the reverse transfer process is the opposite of the above process).

[0062] The connecting container 603 adopts a profile frame and skin structure, and its front is an open structure, through which the separate cargo compartment 1 can be sent out from the cargo compartment connecting station 6.

[0063] like Figure 14 and 15 As shown, the lifting mechanism 601 includes a cargo pallet 601-1, which is movably connected to a linkage seat 601-3 via a cross linkage assembly 601-2. The cross linkage assembly 601-2 is a scissor lift structure as used in the prior art. The vertically moving ends of the cross linkage assembly 601-2 are respectively connected to the sliding grooves of the cargo pallet 601-1 and the linkage seat 601-3 via higher pairs. The linkage seat 601-3 is fixed within the docking box 603.

[0064] A first drive cylinder 601-4 is provided on the linkage seat 601-3. The telescopic end of the first drive cylinder 601-4 is connected to the moving end of the cross linkage assembly 601-2. The first drive cylinder 601-4 controls the scissor movement of the cross linkage assembly 601-2 by pushing the moving end of the cross linkage assembly 601-2, thereby driving the cargo pallet 601-1 to rise and fall, realizing the vertical transportation of the separate cargo compartment 1 under the support of the cargo pallet 601-1.

[0065] In this embodiment, a vertically arranged vertical guide rod 601-5 is fixed on the connecting rod seat 601-3. The upper end of the vertical guide rod 601-5 is connected to the connecting box 603 through the guide rod fixing seat 601-6. A linear bearing 601-7 is slidably connected on the vertical guide rod 601-5. The linear bearing 601-7 is fixed on the cargo pallet 601-1.

[0066] like Figure 16 and 17 As shown, the pushing mechanism 602 includes two movable side plates 602-1, which are respectively arranged on both sides of the lifting mechanism 601. Both sides of the movable side plates 602-1 are connected to the connecting box 603 through the guide sliding assembly 602-2. The guide sliding assembly 602-2 includes a guide rail and a slider. The guide rail is fixed on the inner wall of the connecting box 603, and the slider is fixed on the movable side plate 602-1.

[0067] A second drive cylinder 602-3 is provided below the movable side plate 602-1. The telescopic end of the second drive cylinder 602-3 is connected to the movable side plate 602-1. The bottom of the second drive cylinder 602-3 is fixedly installed inside the connecting box 603.

[0068] The movable side panel 602-1 has a linear module 602-4 on the side near the lifting mechanism 601. The linear module 602-4 has a cargo hold bracket 602-5 on its slide. Both sides of the split cargo hold 1 have support bars 10. The cargo hold bracket 602-5 and the support bars 10 cooperate to support each other.

[0069] The linear module 602-4 mainly consists of a drive motor and a lead screw slide module. The cargo hold bracket 602-5 is connected to the slide block of the lead screw slide module and is driven by the drive motor to perform telescopic movement in the horizontal direction.

[0070] In this embodiment, the cargo hold bracket 602-5 is provided with a rectangular cargo hold positioning groove 602-6, and the bottom of the support bar 10 is provided with a positioning protrusion 1001. The positioning protrusion 1001 is engaged with the rectangular cargo hold positioning groove 602-6 to prevent the cargo hold from slipping during the transfer process.

[0071] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A drone cargo compartment docking system, characterized in that, include: Separate cargo compartment (1); Intermediate connector (2) connects the logistics drone and the separate cargo compartment (1). The mating surfaces of the intermediate connector (2) and the separate cargo compartment (1) are connected by a padlock structure. The padlock structure includes a locking bar (3) and a locking hook assembly (4). The locking hook assembly (4) locks or unlocks from the locking bar (3) under the action of the driving locking device (5). Cargo hold docking station (6), the cargo hold docking station (6) includes a lifting mechanism (601), a pushing mechanism (602) and a docking box (603); the pushing mechanism (602) and the lifting mechanism (601) are both installed in the docking box (603); the lifting mechanism (601) carries the separate cargo hold (1) to a certain height, and then the pushing mechanism (602) transfers the separate cargo hold (1) and pushes it horizontally to a designated position; The intermediate connector (2) includes a body (201), and four fasteners (202) and four connecting holes (203) are arranged around the body (201). The intermediate connector (2) is fixed to the logistics drone by four fasteners (202) and connected to the landing gear of the logistics drone by four connecting holes (203); The locking bar (3) is fixed in the mounting groove on the bottom surface of the intermediate connector (2), and the locking hook assembly (4) and the drive locking device (5) are installed in the mounting groove on the top of the split cargo compartment (1); The number of the locking bars (3) is two; The locking hook assembly (4) includes a rotating locking hook (401). There are two rotating locking hooks (401) arranged symmetrically away from each other. The rotating locking hook (401) is hooked and engaged with the corresponding locking bar (3). The front end of the rotating locking hook (401) is fixed with a front support shaft (402), and the rear end is fixed with a rear support shaft (403). The front support shaft (402) and the rear support shaft (403) are both rotatably connected to the corresponding bearing seat (404). The drive locking device (5) includes a coupling (501) and a drive servo motor (502), and the drive servo motor (502) is poweredly connected to the rear support shaft (403) through the coupling (501).

2. The UAV cargo bay docking system according to claim 1, characterized in that: The drive locking device (5) further includes a lead screw servo motor (503), a locking plate (504), and a locking pin (505). The lead screw servo motor (503) is installed in the mounting slot on the top of the split cargo compartment (1). A lead screw (506) is fixed on the drive shaft of the lead screw servo motor (503). The lead screw (506) is threadedly connected to the locking plate (504). The locking plate (504) is slidably connected to the two front support shafts (402). A locking hole (507) is provided on the locking plate (504). A locking pin (505) is fixed at the front end of the rotating locking hook (401). The locking pin (505) is inserted into the locking hole (507).

3. The unmanned aerial vehicle (UAV) cargo docking system according to claim 1, characterized in that: A dustproof plate (7) is provided on the mounting groove at the top of the split cargo compartment (1), and the dustproof plate (7) has a hollow structure corresponding to the position of the rotating lock hook (401).

4. The UAV cargo bay docking system according to claim 1, characterized in that: The mating surfaces of the intermediate connector (2) and the separate cargo compartment (1) are precisely positioned vertically through a positioning structure. The positioning structure includes multiple positioning hole assemblies (8) and multiple positioning pins (9), wherein the positioning pins (9) and the positioning hole assemblies (8) are inserted into each other in a one-to-one correspondence; The positioning pin (9) is located on the top of the split cargo compartment (1), and the positioning hole assembly (8) is located on the intermediate connector (2); The positioning hole assembly (8) includes a positioning hole (801) provided on the intermediate connector (2). Both ends of the positioning hole (801) are fixed with guide sleeves (802). A buffer rod (803) that can slide up and down is provided between the two guide sleeves (802). A spring (804) is sleeved on the buffer rod (803). The lower end of the spring (804) presses on the base of the buffer rod (803), and the upper end of the spring (804) presses on the guide sleeve (802) above.

5. The unmanned aerial vehicle (UAV) cargo docking system according to claim 1, characterized in that: The lifting mechanism (601) includes a cargo hold pallet (601-1), which is movably connected to a linkage seat (601-3) via a cross linkage assembly (601-2). A first drive electric cylinder (601-4) is provided on the linkage seat (601-3), and the telescopic end of the first drive electric cylinder (601-4) is connected to the moving end of the cross linkage assembly (601-2). A vertically arranged vertical guide rod (601-5) is fixed on the linkage seat (601-3), and the upper end of the vertical guide rod (601-5) is connected to the docking box (603) via a guide rod fixing seat (601-6). A linear bearing (601-7) is slidably connected to the vertical guide rod (601-5), and the linear bearing (601-7) is fixed on the cargo hold pallet (601-1).

6. The unmanned aerial vehicle (UAV) cargo docking system according to claim 1, characterized in that: The pushing mechanism (602) includes two movable side plates (602-1) arranged on both sides of the lifting mechanism (601). Both sides of the movable side plates (602-1) are connected to the connecting box (603) through guide slide components (602-2). A second drive cylinder (602-3) is provided below the movable side plate (602-1), and the telescopic end of the second drive cylinder (602-3) is connected to the movable side plate (602-1). The movable side panel (602-1) is provided with a linear module (602-4) on the side near the lifting mechanism (601). A cargo hold bracket (602-5) is provided on the slide of the linear module (602-4). Support bars (10) are provided on both sides of the split cargo hold (1). The cargo hold bracket (602-5) and the support bars (10) support each other.

7. The unmanned aerial vehicle (UAV) cargo docking system according to claim 6, characterized in that: The cargo hold bracket (602-5) is provided with a rectangular cargo hold positioning groove (602-6), and the bottom of the support bar (10) is provided with a positioning protrusion (1001). The positioning protrusion (1001) is embedded in the rectangular cargo hold positioning groove (602-6) to prevent the cargo hold from slipping during the transfer process.

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