A logistics distribution aircraft and its suspended cargo cabin device suitable for low-altitude cargo transport scenarios

Abstract

The application relates to a logistics distribution aircraft suitable for a low-altitude cargo transportation scene and a suspended cargo cabin device thereof, and belongs to the technical field of the logistics distribution aircraft. The logistics distribution aircraft comprises a machine body, air guide covers are fixedly installed at four output fan positions of the machine body, a ball head pin type clamping groove positioning structure is arranged at the center of the bottom of the machine body, the four air guide covers each comprise a connecting cylinder, a conical air suction cylinder and a conical air guide cylinder, the conical air suction cylinder is coaxially fixedly installed at the upper end of the connecting cylinder, the circumferential side of the cargo cabin is synchronously unfolded in a take-off stage, a ring-shaped flow guide structure formed by the circumferential side of the cargo cabin can regularize and guide the downward washing airflow, and the strong convection turbulence phenomenon on the surface of the cargo cabin is completely eliminated, so that the shaking, displacement and damage of the goods in the cargo cabin caused by airflow impact can be avoided, the integrity of the goods transportation is guaranteed, the interference moment of the turbulent airflow on the machine body can be eliminated, the attitude control precision of the machine body is improved, the risk of attitude instability in the take-off stage is reduced, and the flight safety is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of logistics delivery aircraft technology, specifically to a logistics delivery aircraft suitable for low-altitude freight scenarios and its suspended cargo hold device. Background Technology

[0002] Logistics delivery aircraft are a type of unmanned aerial vehicle used for cargo transportation and delivery. They rely on technologies such as autonomous flight, path planning, and environmental perception to achieve rapid and accurate delivery at low altitudes. They are suitable for various scenarios such as last-mile delivery in cities, remote areas, and emergency rescue, and are core equipment for the low-altitude economy and intelligent logistics.

[0003] During operation, the downwash airflow of a logistics delivery aircraft directly impacts the cargo hold at the bottom of the fuselage. This causes strong convective turbulence on the cargo hold surface, disrupting the aerodynamic stability of the cargo hold. This not only easily leads to the shaking, displacement, or even damage of the cargo inside the hold, but also interferes with the aircraft's attitude control precision, increasing the risk of flight attitude instability. Ultimately, this seriously affects the delivery efficiency, transportation safety, and economic efficiency of the logistics delivery aircraft.

[0004] To address the aforementioned issues, we propose a logistics delivery aircraft and its suspended cargo hold device suitable for low-altitude freight scenarios. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a logistics delivery aircraft suitable for low-altitude freight scenarios, comprising an air body, wherein air guides are fixedly installed at the four output fan positions of the air body, and a ball-head pin type slot positioning structure is provided at the center of the bottom of the air body; Each of the four air guide hoods includes a connecting cylinder, a conical suction cylinder, and a conical air guide cylinder. The conical suction cylinder is coaxially fixedly installed at the upper end of the connecting cylinder, and the conical air guide cylinder is coaxially fixedly installed at the lower end of the connecting cylinder. Three connecting diagonal rods are fixedly installed circumferentially at equal intervals on the lower side of the inner wall of the connecting cylinder. The bottom ends of the three connecting diagonal rods are fixedly connected to the outer wall of the machine body. A spiral air guide plate is fixedly installed circumferentially on the inner wall of the conical air guide cylinder.

[0006] Furthermore, the top of the connecting rod has an upward-sloping air-guiding slope structure to reduce airflow resistance and improve airflow efficiency. The openings of the conical intake cylinder and the conical air guide cylinder are both frustum-shaped structures with a larger top and a smaller bottom.

[0007] A suspended cargo hold device for a logistics delivery aircraft suitable for low-altitude freight scenarios includes a storage box installed at the bottom of a ball-head pin-type slot positioning structure. Each of the four corners of the storage box has a push cavity along the extension direction of the corner. The inner walls of the four push cavities are slidably mounted with movable blocks, and the inner walls of the movable blocks are threadedly connected with a spiral conveying rod. The upper end of the spiral conveying rod is coaxially fixed with a transmission fan through a one-way rotating bearing. On the outer peripheral wall of the storage box, collection grooves are provided along its circumference. A guide plate is rotatably mounted on the upper side of the inner wall of each collection groove. An embedded groove is provided on the adjacent side wall of the moving block. An unfolding rod is rotatably installed on the groove wall of each embedded groove. An extension opening is provided on the cavity wall of the pushing cavity on one side corresponding to the two unfolding rods. One end of the unfolding rod passes through the extension port and extends into the groove of the collection tank. The end of the unfolding rod is rotatably connected to the surface of the guide plate through a connecting block to achieve the arc swing deformation of the guide plate. A push spring is coaxially fitted on the rod wall of the spiral conveying rod and below the moving block.

[0008] Furthermore, the upper ends of the four spiral conveying rods extend through to the top of the storage box, and the lower ends of the spiral conveying rods are rotatably connected to the lower side of the inner wall of the pushing square cavity. The transmission fan can receive the downward airflow generated by the machine body and convert the airflow energy into rotational driving force, driving the spiral conveying rods to rotate synchronously along the rotation direction defined by the one-way rotation bearing. The bottom of the one-way rotation bearing is rotatably connected to the top of the storage box.

[0009] Furthermore, the thread helix angle and thread clearance of the spiral conveyor are set to a large clearance specification, so that the moving block can be displaced along the axial direction of the spiral conveyor without relying on the rotation drive of the spiral conveyor, only under the assistance of external thrust.

[0010] Furthermore, the guide plate, moving block, unfolding rod, and storage box are all made of carbon fiber reinforced composite material to reduce the overall weight of the device.

[0011] Furthermore, the top of the storage box has two symmetrical feeding ports, and the inner wall of each feeding port is slidably fitted with a sealing cover. The sealing cover and the feeding port adopt an embedded sliding connection structure. The outer wall of the sealing cover fits against the inner wall of the feeding port. The outer edge of the sealing cover is provided with a pull groove for the operator to insert their fingers and apply force.

[0012] Furthermore, a matching snap-fit ​​groove is provided at the corresponding position of the feeding port. When the sealing cover is fully pushed into the feeding port and is in the closed state, the sealing cover engages with the snap-fit ​​groove to lock and fix the sealing cover.

[0013] Furthermore, the elastic thrust of the push spring in its initial state can drive the moving block to move upward along the axial direction of the spiral conveyor rod, thereby pulling the guide plate into the collection trough through the unfolding rod.

[0014] Furthermore, when the aircraft takes off and is in the maximum wind condition, the push spring is compressed and deformed by the reverse pressure of the airflow. After the aircraft takes off and the wind weakens, the elastic restoring force of the push spring drives the moving block to reset, thereby pulling the guide plate to retract into the collection trough again.

[0015] Compared with the prior art, the present invention provides a logistics delivery aircraft and its suspended cargo hold device suitable for low-altitude cargo scenarios, which has the following beneficial effects: 1. During takeoff, the device simultaneously deploys the deflectors around the cargo hold, forming a ring-shaped flow structure that regulates and guides the downwash airflow. This transforms the turbulent airflow that would otherwise directly impact the cargo hold surface into an orderly flow along the deflector surface, completely eliminating strong convective turbulence on the cargo hold surface. This prevents cargo from swaying, shifting, or being damaged due to airflow impact, ensuring the integrity of cargo transport. It also eliminates the interference torque of turbulent airflow on the aircraft fuselage, improving the accuracy of aircraft attitude control, reducing the risk of attitude instability during takeoff, and ensuring flight safety.

[0016] 2. This device optimizes the aerodynamic environment around the cargo hold by deploying deflectors, reducing additional drag caused by turbulent airflow. This eliminates the need for the aircraft's power system to output additional power to overcome drag, effectively reducing energy consumption during takeoff. At the same time, the deflectors automatically retract during level flight, maintaining the integrity of the cargo hold surface and reducing cruise drag, thereby improving the aircraft's range and effective payload capacity, and optimizing the efficiency and economy of logistics and distribution.

[0017] 3. The device uses a purely mechanical linkage to achieve power transmission and deflector deployment, eliminating the need for additional sensors, controllers, and other electronic control components. This not only reduces structural complexity and failure rate but also avoids energy loss in the electronic control system. The structure is adaptable to logistics delivery aircraft with different configurations, such as multi-rotor and compound wing aircraft, and has strong versatility and engineering application value. Attached Figure Description

[0018] Figure 1 This is a perspective view of the entire invention; Figure 2 This is a three-dimensional view of the entire invention. Figure 3 This is a bottom-view perspective view of the body of the present invention; Figure 4 This is a perspective view of the air guide cover of the present invention. Figure 5 This is a vertical sectional perspective view of the air guide cover of the present invention; Figure 6 This is a perspective cross-sectional view of the storage box of the present invention; Figure 7 for Figure 6 Enlarged structural diagram of section A in the middle; Figure 8 This is a perspective view of the storage box of the present invention. Figure 9 for Figure 8 Enlarged structural diagram of section B; Figure 10 This is a perspective view of the guide plate of the present invention; Figure 11 This is a perspective view of the moving block of the present invention.

[0019] In the image: 1. Body; 2. Air guide hood; 201. Connecting cylinder; 202. Conical air intake cylinder; 203. Conical air guide cylinder; 204. Connecting diagonal rod; 205. Spiral air guide plate; 3. Ball-head pin type slot positioning structure; 4. Storage box; 5. Pushing square cavity; 6. Moving block; 7. Spiral conveyor rod; 8. One-way rotating bearing; 9. Drive fan; 10. Collection tank; 11. Guide plate; 12. Embedded groove; 13. Unfolding rod; 14. Extension port; 15. Connecting block; 16. Push spring; 17. Feed port; 18. Sealing cover; 19. Pull groove. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1 to 11 This embodiment of a logistics delivery aircraft suitable for low-altitude freight scenarios includes a fuselage 1. Air guides 2 are fixedly installed at the four output fan positions of the fuselage 1. A ball-head pin type slot positioning structure 3 is provided at the center of the bottom of the fuselage 1. Each of the four air guide hoods 2 includes a connecting cylinder 201, a conical air intake cylinder 202, and a conical air guide cylinder 203. The conical air intake cylinder 202 is coaxially fixedly installed at the upper end of the connecting cylinder 201, and the conical air guide cylinder 203 is coaxially fixedly installed at the lower end of the connecting cylinder 201. Three connecting diagonal rods 204 are fixedly installed circumferentially on the lower side of the inner wall of the connecting cylinder 201. The bottom ends of the three connecting diagonal rods 204 are fixedly connected to the outer wall of the machine body 1. A spiral air guide plate 205 is fixedly installed circumferentially on the inner wall of the conical air guide cylinder 203, which is used to guide and pressurize the airflow during the airflow output process to improve the output kinetic energy of the airflow. The top of the connecting rod 204 is an upward-sloping air guide slope structure to reduce airflow resistance and improve airflow efficiency. The openings of the conical intake cylinder 202 and the conical air guide cylinder 203 are both frustum-shaped structures with a larger top and a smaller bottom.

[0022] A suspended cargo hold device for a logistics delivery aircraft suitable for low-altitude freight scenarios includes a storage box 4 installed at the bottom of a ball-head pin type slot positioning structure 3. At the four corners of the storage box 4, a push cavity 5 is provided along the extension direction of the corner. The inner walls of the four push cavities 5 are slidably installed with movable blocks 6, and the inner walls of the movable blocks 6 are threadedly connected with spiral conveying rods 7. The upper end of the spiral conveying rods 7 is coaxially fixedly installed with a transmission fan 9 through a one-way rotating bearing 8. The upper ends of the four spiral conveying rods 7 extend through to the top of the storage box 4. The thread of the screw conveyor 7 and the internal thread of the moving block 6 are in a large clearance fit. When the airflow power weakens and the push spring 16 pushes the moving block 6 to reset upward, the moving block 6 and the screw conveyor 7 slide relative to each other axially instead of driving the screw conveyor 7 to rotate. The screw conveyor 7 remains stationary or slightly idle under the support of the one-way rotating bearing 8, thereby realizing the rapid and low-resistance linear reset motion of the moving block 6. The lower end of the spiral conveyor 7 is rotatably connected to the lower side of the inner wall of the push cavity 5. The drive fan 9 can receive the downward airflow generated by the body 1 and convert the airflow energy into rotational driving force to drive the spiral conveyor 7 to rotate synchronously in the rotation direction defined by the one-way rotating bearing 8. The bottom of the one-way rotating bearing 8 is rotatably connected to the top of the storage box 4. The thread helix angle and thread clearance of the spiral conveyor 7 are set to a large clearance specification, so that the moving block 6 can be displaced along the axial direction of the spiral conveyor 7 without relying on the rotational drive of the spiral conveyor 7, only under the assistance of external thrust. The storage box 4 has collection grooves 10 on its outer peripheral wall along its circumference. Each collection groove 10 has a guide plate 11 rotatably mounted on the upper side of its inner wall. The adjacent side walls of the moving block 6 have embedded grooves 12. Each embedded groove 12 has an extension rod 13 rotatably mounted on its groove wall. The cavity wall of the pushing cavity 5 has an extension port 14 on one side corresponding to the two extension rods 13. The guide plate 11, the moving block 6, the extension rod 13 and the storage box 4 are all made of carbon fiber reinforced composite material to reduce the overall weight of the device. When the aircraft 1 takes off and is in the maximum wind condition, the push spring 16 is compressed and deformed by the reverse pressure of the airflow. After the aircraft 1 takes off, the wind weakens, and the elastic restoring force of the push spring 16 drives the moving block 6 to reset, thereby pulling the deflector plate 11 back into the collection tank 10. When the aircraft 1 is in the downwash airflow condition with the peak power output of the rotor during the takeoff stage, the deflector plate 11 is driven by the positive thrust of the downwash airflow, which drives the moving block 6 to slide along the extension direction of the collection tank 10 and compresses and deforms the push spring 16. When the aircraft 1 completes takeoff and enters the cruise stage, and the downwash airflow intensity weakens to a preset threshold, the elastic restoring force of the push spring 16 drives the moving block 6 to slide back into the collection tank 10 in the opposite direction, thereby pulling the deflector plate 11 back into the collection tank 10. One end of the unfolding rod 13 passes through the extension port 14 and extends into the groove of the collection tank 10. The end of the unfolding rod 13 is rotatably connected to the surface of the guide plate 11 through the connecting block 15 to realize the arc swing deformation of the guide plate 11. A push spring 16 is coaxially mounted on the rod wall of the spiral conveying rod 7 and below the moving block 6. The elastic thrust of the push spring 16 in the initial state can drive the moving block 6 to move upward along the axial direction of the spiral conveying rod 7, and then pull the guide plate 11 to retract into the collection tank 10 through the unfolding rod 13. The top of the storage box 4 has two feeding ports 17 with a symmetrical structure. The inner wall of each feeding port 17 is slidably fitted with a sealing cover 18. The sealing cover 18 and the feeding port 17 adopt an embedded sliding connection structure. The outer wall of the sealing cover 18 is in contact with the inner wall of the feeding port 17. The outer edge of the sealing cover 18 is provided with a pull groove 19 for the operator to insert and apply force with their fingers. A corresponding snap-fit ​​groove is provided at the corresponding position of the feeding port 17. When the sealing cover 18 is fully pushed into the feeding port 17 and is in the closed state, the sealing cover 18 is engaged with the snap-fit ​​groove to lock and fix the sealing cover 18. The depth and width of the pull groove 19 are adapted to the insertion size of the operator's fingers so that the sealing cover 18 can be pulled out of the feeding port 17 by pulling the inner wall of the pull groove 19, thereby improving the convenience of opening and closing the sealing cover 18.

[0023] The working principle of the above embodiments is as follows: When the device is in use, the four output fan blades of the body 1 are activated, generating a strong downwash airflow. Each fan blade is equipped with an air guide shroud 2. Under the action of the air guide shroud 2, the airflow is first gathered by the cone-shaped air intake 202, which is larger at the top and smaller at the bottom. When it flows through the connecting cylinder 201, the inclined connecting rod 204 inside it effectively reduces the wind resistance due to the guide slope structure at the top. Finally, the airflow enters the cone-shaped air guide 203 and is guided and pressurized by the spiral air guide plate 205 fixed on its inner wall, forming a concentrated, high-kinetic-energy downward jet airflow. This generates a downward airflow that is higher than that of a traditional body 1 when the body 1 just begins to take off, which produces the necessary power output effect for better take-off and to ensure the stability of the storage box 4. The storage box 4 is connected to the top of the storage box 4 via the ball-head pin type slot positioning structure 3 at the bottom of the fuselage 1. The top of the storage box 4 is equipped with a drive fan 9, which is located directly below the outlet of the air guide shroud 2 in the fuselage 1. When the fuselage 1 takes off or is in a high-power condition, the strongest downwash airflow directly impacts the drive fan 9, driving it to rotate. The drive fan 9 is coaxially connected to the screw conveyor 7 via a one-way rotating bearing 8. This one-way bearing limits the drive fan 9 to drive the screw conveyor 7 to rotate in only one direction. The rotation of the spiral conveyor rod 7 drives the movable block 6, which is threadedly connected to it, to move downward along the push cavity 5. The downward movement of the movable block 6 overcomes the elastic force of the push spring 16 below it. At the same time, the unfolding rod 13, which is connected to the side wall of the movable block 6 through the embedded groove 12, moves accordingly. The unfolding rod 13 passes through the extension port 14, and its end is hinged to the guide plate 11 through the connecting block 15. Therefore, the downward movement of the movable block 6 is converted into a thrust on the guide plate 11 through the unfolding rod 13, which forces the guide plate 11, which was originally gathered in the collection tank 10, to rotate outward and downward to form a guide surface surrounding the cargo hold. In this way, during takeoff, landing and low-speed maneuvering, the deployed deflector 11 can effectively sort and regulate the turbulent airflow from the fuselage 1 through the cargo hold, reduce air vortices, and thus significantly improve the wind resistance and operational stability of the fuselage 1. When the aircraft 1 finishes high-power operation, such as after takeoff and transitioning to stable cruise, the airflow power of the impact drive fan 9 weakens. At this time, the elastic restoring force of the compressed push spring 16 becomes dominant. This force pushes the moving block 6 to move upward and reset along the spiral conveyor rod 7. Due to the large thread helix angle and clearance of the spiral conveyor rod 7, the moving block 6, under the action of the push spring 16, can drive the spiral conveyor rod 7 to rotate in the opposite direction to the rotation direction at startup. Under the unidirectional rotation effect of the one-way rotating bearing 8, combined with the thrust of the push spring 16, the spiral conveyor rod 7 can rotate in the opposite direction without causing other effects on the drive fan 9. The upward movement of the moving block 6 pulls the guide plate 11 in the opposite direction through the unfolding rod 13, causing it to automatically fold back and perfectly fit into the collection groove 10 on the side wall of the storage box 4, restoring the streamlined appearance of the cargo hold, so as to maximize the reduction of air resistance during the cruise phase. The storage box 4 is provided with a feeding port 17 on the top. Its sealing cover 18 adopts an embedded sliding connection. The edge of the cover has a groove 19. Its size is adapted to the fingers, which facilitates quick opening and closing and improves the convenience of loading and unloading on the ground. When closed, the sealing cover 18 can be locked and fixed with the snap-fit ​​groove in the feeding port 17. The snap-fit ​​groove of this device is a mature existing technology and will not be described in detail in this application. Key structural components of this application, such as the guide plate 11, the moving block 6, the unfolding rod 13, and the storage box 4, are all made of carbon fiber reinforced composite materials. While ensuring structural strength, the weight of the device is greatly reduced, which is beneficial to improving the load-bearing capacity and endurance of the body 1. Furthermore, the space of the collection tank 10 can greatly reduce the weight of the storage box 4, thereby reducing the energy consumption of the body 1.

[0024] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods. Any method that can achieve its beneficial effect can be implemented. In addition, the electrical components in this embodiment are all electrically connected to the main controller and the power supply. The main controller can be a conventional known device such as a computer that plays a control role. Those skilled in the art can control the electrical components through simple programming. Moreover, the existing disclosed power connection technology is also common knowledge in the field. Therefore, the specific structural composition and working principle will not be described in detail in this embodiment.

Claims

1. A logistics delivery aircraft suitable for low-altitude freight scenarios, comprising an airframe (1), characterized in that: The machine body (1) has air guide covers (2) fixedly installed at the four output fan positions, and the bottom of the machine body (1) is provided with a ball head pin type slot positioning structure (3). Each of the four air guide hoods (2) includes a connecting cylinder (201), a conical air intake cylinder (202), and a conical air guide cylinder (203). The conical air intake cylinder (202) is coaxially fixedly installed at the upper end of the connecting cylinder (201), and the conical air guide cylinder (203) is coaxially fixedly installed at the lower end of the connecting cylinder (201). Three connecting diagonal rods (204) are fixedly installed circumferentially on the lower side of the inner wall of the connecting cylinder (201). The bottom ends of the three connecting diagonal rods (204) are fixedly connected to the outer wall of the machine body (1). A spiral air guide plate (205) is fixedly installed circumferentially on the inner wall of the conical air guide cylinder (203).

2. The logistics delivery aircraft suitable for low-altitude freight scenarios according to claim 1, characterized in that: The top of the connecting rod (204) is an upward-sloping air guide slope structure to reduce airflow resistance and improve airflow efficiency. The openings of the conical air intake cylinder (202) and the conical air guide cylinder (203) are both frustum-shaped structures with a larger top and a smaller bottom.

3. A suspended cargo hold device for a logistics delivery aircraft suitable for low-altitude freight scenarios, characterized in that: The logistics delivery aircraft applicable to low-altitude freight scenarios as described in claim 2, and the storage box (4) installed at the bottom of the ball-head pin type slot positioning structure (3), wherein the storage box (4) has a push square cavity (5) at each of the four corners along the extension direction of the corner, and a movable block (6) is slidably installed on the inner wall of each of the four push square cavities (5), and a spiral conveying rod (7) is threadedly connected to the inner wall of the movable block (6), and a transmission fan (9) is coaxially fixedly installed on the upper end of the spiral conveying rod (7) through a one-way rotating bearing (8); On the outer peripheral wall of the storage box (4), there are collection grooves (10) along its circumference. A guide plate (11) is rotatably mounted on the upper side of the inner wall of each collection groove (10). An embedded groove (12) is opened on the adjacent side wall of the moving block (6). An unfolding rod (13) is rotatably installed on the groove wall of each embedded groove (12). An extension port (14) is opened on the cavity wall of the pushing cavity (5) corresponding to one side of the two unfolding rods (13). One end of the unfolding rod (13) passes through the extension port (14) and extends into the groove of the collection tank (10). The end of the unfolding rod (13) is rotatably connected to the surface of the guide plate (11) through a connecting block (15) to realize the arc swing deformation of the guide plate (11). A push spring (16) is coaxially fitted on the rod wall of the spiral conveying rod (7) and below the moving block (6).

4. The suspended cargo hold device for a logistics delivery aircraft suitable for low-altitude freight scenarios according to claim 3, characterized in that: The upper ends of the four spiral conveying rods (7) extend through to the top of the storage box (4), and the lower ends of the spiral conveying rods (7) are rotatably connected to the lower side of the inner wall of the push square cavity (5). The drive fan (9) can receive the downward airflow generated by the body (1) and convert the airflow energy into rotational driving force, driving the spiral conveying rods (7) to rotate synchronously in the rotation direction defined by the one-way rotating bearing (8). The bottom of the one-way rotating bearing (8) is rotatably connected to the top of the storage box (4).

5. A suspended cargo hold device for a logistics delivery aircraft suitable for low-altitude freight scenarios according to claim 3, characterized in that: The thread helix angle and thread clearance of the spiral conveyor (7) are set to a large clearance specification, so that the moving block (6) can generate displacement along the axial direction of the spiral conveyor (7) without relying on the rotation drive of the spiral conveyor (7) and only under the assistance of external thrust.

6. A suspended cargo hold device for a logistics delivery aircraft suitable for low-altitude freight scenarios according to claim 3, characterized in that: The guide plate (11), the moving block (6), the unfolding rod (13) and the storage box (4) are all made of carbon fiber reinforced composite material to reduce the overall weight of the device.

7. A suspended cargo hold device for a logistics delivery aircraft suitable for low-altitude freight scenarios according to claim 3, characterized in that: The top of the storage box (4) has two feeding ports (17) with a symmetrical structure. Each feeding port (17) has a sealing cover (18) that is slidably fitted on its inner wall. The sealing cover (18) and the feeding port (17) adopt an embedded sliding connection structure. The outer wall of the sealing cover (18) is in contact with the inner wall of the feeding port (17). The outer edge of the sealing cover (18) is provided with a groove (19) for the operator to insert his / her fingers and apply force.

8. A suspended cargo hold device for a logistics delivery aircraft suitable for low-altitude freight scenarios according to claim 7, characterized in that: The feeding port (17) is provided with a matching snap-fit ​​groove at the corresponding position. When the sealing cover (18) is fully pushed into the feeding port (17) and is in the closed state, the sealing cover (18) engages with the snap-fit ​​groove to lock and fix the sealing cover (18).

9. A suspended cargo hold device for a logistics delivery aircraft suitable for low-altitude freight scenarios according to claim 3, characterized in that: The elastic thrust of the push spring (16) in the initial state can drive the moving block (6) to move upward along the axial direction of the spiral conveying rod (7), and then pull the guide plate (11) into the collection groove (10) through the unfolding rod (13).

10. A suspended cargo hold device for a logistics delivery aircraft suitable for low-altitude freight scenarios according to claim 3, characterized in that: When the aircraft (1) takes off and is in the maximum wind condition, the push spring (16) is compressed and deformed by the reverse pressure of the airflow. After the aircraft (1) takes off, the wind weakens, and the elastic restoring force of the push spring (16) drives the moving block (6) to reset, and then pulls the guide plate (11) to gather in the collection groove (10) again.

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