A cargo carrier for unmanned aerial vehicles

Abstract

This utility model discloses a cargo-carrying device for unmanned aerial vehicles (UAVs), including a UAV body, a connecting plate, a vertical rod, and a cargo-carrying frame assembly. By setting up the cargo-carrying frame assembly, pressure sensor arrays are integrated at the four corners of the cargo-carrying frame base plate to collect pressure data from all directions in real time, calculate the coordinates of the object's center of gravity, and accurately identify the direction and magnitude of the center of gravity offset, providing data support for dynamic adjustment. Based on the center of gravity detection results, a drive motor is linked to a screw and a ring slide rail system to control the counterweight to move radially and circumferentially in a coordinated manner, achieving multi-degree-of-freedom precise weight distribution, ensuring that the overall center of gravity of the cargo-carrying frame coincides with the axis of the UAV, and significantly improving flight stability.

Description

Technical Field

[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) cargo-carrying technology, specifically a cargo-carrying device for UAVs. Background Technology

[0002] As a core support for modern intelligent logistics, emergency rescue and special operations, unmanned aerial vehicle (UAV) cargo technology is gradually developing towards high efficiency and intelligence. In existing UAV cargo devices, the center of gravity control problem has always been a key bottleneck restricting their transportation stability.

[0003] When transporting multiple types of items simultaneously, such as in the transportation of logistics parcels, each parcel has a different weight and volume. The current method of adjusting the weights based on manual experience is not only inefficient but also makes it difficult to achieve precise balance, which in turn affects the flight attitude of drones and may even lead to the risk of loss of control. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the shortcomings of the existing technology, this utility model provides a cargo-carrying device for unmanned aerial vehicles (UAVs), which solves the problems mentioned above.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution: a cargo-carrying device for unmanned aerial vehicles (UAVs), comprising a UAV body, a connecting plate, a vertical rod, and a cargo-carrying frame assembly. The connecting plate is fixed to the bottom end of the UAV body, and vertical rods are fixed to the bottom corners of the connecting plate, with the bottom of the vertical rods fixedly connected to the cargo-carrying frame assembly.

[0008] The loading frame assembly includes an outer frame, a base plate, pressure sensors, an item placement frame, a center of gravity adjustment device, and latches. The base plate is located on the inner bottom of the outer frame, and pressure sensors are installed at the four corners of the bottom of the base plate. The item placement frame is placed inside the outer frame, and its bottom is supported by the base plate. The center of gravity adjustment device is located at the bottom of the outer frame, and its four sides are locked to the outer frame by latches.

[0009] Preferably, the center of gravity adjustment device includes a housing, a drive device, a screw, a slider, a counterweight, and an annular slide rail. The drive device is installed in the middle of the housing. One end of the screw is connected to the drive device for transmission, and the other end of the drive device is rotatably connected to the slider through a bearing. The screw passes through the counterweight, and the inner wall of the counterweight is threadedly connected to the screw. The bottom of the slider slides along the annular slide rail.

[0010] Preferably, a universal ball bearing is installed at the bottom corner of the counterweight, and the bottom of the universal ball bearing is in contact with the inner bottom surface of the outer shell.

[0011] Preferably, the driving device includes a rotating shell, bearings, a connecting pipe, gear one, gear two, drive motor one, drive motor two, a transmission shaft, and a bevel gear set. The rotating shell is circular in plan view and is located at the center of the bottom inner side of the outer shell. The bottom of the outer wall of the rotating shell is rotatably connected to the outer shell through the bearing. A connecting pipe is provided at the center of the top of the rotating shell. Gear one is fitted on the outer wall of the connecting pipe and is drivingly connected to the connecting pipe. The left side of gear one meshes with gear two. The output shaft of drive motor one is drivingly connected to gear two, and the output shaft of drive motor two is drivingly connected to the transmission shaft. The transmission shaft vertically passes through the connecting pipe, and the bottom end of the transmission shaft extends into the rotating shell. The bottom end of the transmission shaft is drivingly connected to a screw through the bevel gear set. Both drive motor one and drive motor two are fixed to the top of the outer shell.

[0012] Preferably, the centers of the rotating housing, bearing, connecting pipe, and transmission shaft are arranged on the same vertical line.

[0013] Preferably, a gearbox is installed on the outer side of gear one and gear two, and the top of the gearbox is fixedly connected to the outer shell.

[0014] Preferably, a controller is installed on the top of the housing, and a protective frame is provided on the outside of the drive motor one, drive motor two and the controller, and a groove corresponding to the protective frame is opened at the bottom of the outer frame.

[0015] Preferably, a support arm is fixed to the outside of the main body of the drone, and a propeller motor is installed at the outer end of the support arm. The output shaft of the propeller motor is connected to the propeller drive.

[0016] (III) Beneficial Effects

[0017] This invention provides a cargo-carrying device for unmanned aerial vehicles (UAVs). It offers the following advantages: By incorporating a cargo-carrying frame assembly and integrating pressure sensor arrays at the four corners of the frame's base plate, it collects pressure data from all directions in real time, calculates the coordinates of the object's center of gravity, and accurately identifies the direction and magnitude of the center of gravity shift. This provides data support for dynamic adjustment. Based on the center of gravity detection results, a drive motor, a linkage screw, and a circular slide rail system control the counterweight to move radially (screw direction) and circumferentially (slide rail direction) in a coordinated manner. This achieves precise multi-degree-of-freedom weight distribution, ensuring that the overall center of gravity of the cargo-carrying frame coincides with the UAV's axis, significantly improving flight stability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a front view of the structure of this utility model;

[0020] Figure 3This is a schematic diagram of the structure of the loading frame component in this utility model;

[0021] Figure 4 This is a schematic diagram of the internal structure of the loading frame component in this utility model;

[0022] Figure 5 This is a schematic diagram of the internal structure of the center adjustment device in this utility model;

[0023] Figure 6 This is a top view of the internal structure of the center adjustment device in this utility model;

[0024] Figure 7 This is a schematic diagram of the internal structure of the drive device in this utility model;

[0025] Figure 8 This utility model Figure 7 A magnified view of a portion of area A.

[0026] In the diagram: UAV main body-1, connecting plate-2, vertical rod-3, cargo frame assembly-4, support arm-5, propeller motor-6, propeller-7, outer frame-41, base plate-42, pressure sensor-43, item placement frame-44, center of gravity adjustment device-45, latch-46, outer shell-451, drive device-452, screw-453, slider-454, counterweight-455, circular slide rail-456, rotating shell-4521, bearing-4522, connecting pipe-4523, gear one-4524, gear two-4525, drive motor one-4526, drive motor two-4527, transmission shaft-4528, bevel gear set-4529, gearbox-45210, controller-45211. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-2 This utility model provides a technical solution for a cargo carrier for unmanned aerial vehicles (UAVs): A cargo carrier for UAVs includes a UAV body 1, a connecting plate 2, a vertical rod 3, and a cargo frame assembly 4. The connecting plate 2 is fixed to the bottom end of the UAV body 1, and the vertical rod 3 is fixed to the bottom corner of the connecting plate 2. The bottom of the vertical rod 3 is fixedly connected to the cargo frame assembly 4. A support arm 5 is fixed to the outside of the UAV body 1, and a propeller motor 6 is installed at the outside end of the support arm 5. The output shaft of the propeller motor 6 is connected to the propeller 7 for transmission.

[0029] Please see Figure 3-4 The carrying frame assembly 4 includes an outer frame 41, a base plate 42, a pressure sensor 43, an item placement frame 44, a center of gravity adjustment device 45, and a latch 46. The base plate 42 is provided on the inner bottom of the outer frame 41. Pressure sensors 43 are installed at the four corners of the bottom of the base plate 42. The item placement frame 44 is placed inside the outer frame 41, and the bottom of the item placement frame 44 is supported by the base plate 42. The center of gravity adjustment device 45 is provided at the bottom of the outer frame 41, and the center of gravity adjustment device 45 is locked to the outer frame 41 by latches 46 on all four sides.

[0030] The item placement frame 44 is a replaceable frame, and different item placement frames 44 can be replaced according to the items to be placed. The item placement frame 44 can be equipped with partitions to separate the items, and can also be equipped with limiting plates to center and limit the items, and ensure that the center of gravity of the items is centered. The items and the item placement frame 44 can be filled with filler materials, such as foam boards, to prevent the items from moving during transportation and affecting the stability of the drone.

[0031] Please see Figure 5-6 The center of gravity adjustment device 45 includes a housing 451, a drive device 452, a screw 453, a slider 454, a counterweight 455, and an annular slide rail 456. The drive device 452 is installed in the middle of the housing 451. One end of the screw 453 is connected to the drive device 452 for transmission, and the other end of the drive device 452 is rotatably connected to the slider 454 through a bearing. The screw 453 passes through the counterweight 455, and the inner wall of the counterweight 455 is threadedly connected to the screw 453. The bottom of the slider 454 slides along the annular slide rail 456.

[0032] Universal ball bearings are installed at the bottom corner of the counterweight 455, and the bottom of the universal ball bearings is in contact with the inner bottom surface of the outer casing 451. The bottom of the counterweight 455 can slide at any angle through the universal ball bearings, and the rotation of the counterweight 455 is restricted, so that the screw 453 rotates to drive the counterweight 455 to move.

[0033] Please see Figure 7-8The drive unit 452 includes a rotating housing 4521, a bearing 4522, a connecting pipe 4523, a first gear 4524, a second gear 4525, a first drive motor 4526, a second drive motor 4527, a transmission shaft 4528, and a bevel gear set 4529. The rotating housing 4521 is circular in plan view and is located at the center of the bottom inner side of the outer housing 451. The bottom of the outer wall of the rotating housing 4521 is rotatably connected to the outer housing 451 via the bearing 4522. The connecting pipe 4523 is located at the center of the top of the rotating housing 4521, and the first gear 4524 is fitted onto the outer wall of the connecting pipe 4523. Furthermore, gear 4524 is connected to connecting pipe 4523 for transmission, and the left side of gear 4524 meshes with gear 4525. The output shaft of drive motor 4526 is connected to gear 4525 for transmission, and the output shaft of drive motor 4527 is connected to drive shaft 4528 for transmission. Drive shaft 4528 vertically passes through connecting pipe 4523, and the bottom end of drive shaft 4528 extends into rotating housing 4521. The bottom end of drive shaft 4528 is connected to screw 453 through bevel gear set 4529 for transmission. Both drive motor 4526 and drive motor 4527 are fixed to the top of housing 451.

[0034] The rotating housing 4521, bearing 4522, connecting pipe 4523 and transmission shaft 4528 are arranged with their centers on the same vertical line, so that when gear 4524 rotates, it drives the connecting pipe 4523 and rotating housing 4521 to rotate concentrically, and the connecting pipe 4523 drives along the outer wall of transmission shaft 4528.

[0035] Gearbox 45210 is installed on the outside of gear 1 4524 and gear 2 4525, and the top of gearbox 45210 is fixedly connected to housing 451. Gear 1 4524 and gear 2 4525 are protected by gearbox 45210.

[0036] The bevel gear set 4529 consists of two meshing bevel gears, and the centers of the two bevel gears are respectively connected to the drive shaft 4528 and the screw 453.

[0037] The top of the outer casing 451 is equipped with a controller 45211, and a protective frame is provided on the outside of the drive motor 4526, the drive motor 4527 and the controller 45211. The bottom of the outer frame 41 is provided with a groove corresponding to the protective frame. The controller 45211 is equipped with a power supply module for supplying power to the drive motor 4526 and the drive motor 4527 and for controlling them.

[0038] Pressure sensor 43 is a strain gauge type pressure sensor, and it can transmit data to controller 45211 via wired or wireless data transmission. The data transmission method is a mature existing technology and therefore will not be described in detail. Four pressure sensors 43 are respectively installed at the four corners of the base plate 42, forming a four-corner support structure. When an item is placed in the item placement frame 44, the sensors detect the pressure values ​​at each corner in real time and output analog signals. Controller 45211 receives the data from the four sensors and calculates the center of gravity position.

[0039] When using it, first put the required item placement box 44 into the outer frame 41, then place the item in the item placement box 44, and limit the placement of the item to prevent the item from moving during transportation.

[0040] The weight of the object is calculated by the four pressure sensors 43 at the bottom of the base plate 42 in different directions, and the center of gravity of the object is determined. The position of the counterweight 455 is then adjusted according to the center of gravity of the object.

[0041] When adjusting the position of the counterweight 455, drive motor 4526 and drive motor 4527 are controlled respectively. Drive motor 4526 drives gear 4525 to rotate, gear 4525 drives gear 4524 to rotate, and when gear 4524 rotates, it drives connecting pipe 4523 and rotating shell 4521 to rotate concentrically. Rotating shell 4521 drives screw 453, slider 454 and counterweight 455 to rotate in a plane with the center of rotating shell 4521 as the center point. Adjusting the position of counterweight 455, and when slider 454 rotates, it slides along annular slide rail 456. Drive motor 4527 drives transmission shaft 4528 to rotate, and transmission shaft 4528 drives screw 453 to rotate through bevel gear set 4529. The rotation of screw 453 drives counterweight 455 to move along the direction of screw 453 through the threaded engagement between screw 453 and counterweight 455.

[0042] By controlling drive motor 4526 and drive motor 4527 respectively to adjust the position of counterweight 455, the center of gravity of the item is matched, so that the center of gravity of the cargo frame assembly 4 containing the item is centered, increasing the stability of the item transportation process. The main body of the drone 1 controls the propeller motor 6 to drive the propeller 7 to rotate at high speed, so that the main body of the drone 1 drives the cargo frame assembly 4 to carry out flight transportation.

[0043] When the center of gravity of the item is centered and no counterweight is needed, the center of gravity adjustment device 45 can be removed by opening the latch 46 and disconnecting the connection between the center of gravity adjustment device 45 and the outer frame 41.

[0044] The control method of this utility model is to control the device by manually starting and stopping the switch. The wiring diagram of the power element and the supply of power are common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and wiring layout will not be explained in detail.

[0045] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

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