Unmanned aerial vehicle load releasing device

Abstract

A load to be released is fixed to a bottom plate, a box body is of a hollow structure with an opening in the bottom, and the top of the box body is fixedly connected with an unmanned aerial vehicle. The L-shaped claw is arranged at the side part of the box body, the lower part of the L-shaped claw is hinged with the lower part of the box body, and the bottom of the L-shaped claw is used for supporting the bottom plate; the electromagnet and the control circuit board are both installed on the upper portion of the box body. The electromagnet is connected with the control circuit board through a cable. When the control circuit board controls the electromagnets to extend and the upper portions of the L-shaped claws abut against and limit the upper portions of the L-shaped claws, the bottoms of the L-shaped claws are buckled to the bottom of the bottom plate so that the bottom plate can cover the bottom of the box body. And when the control circuit board controls the electromagnet to contract and loosen the limit on the upper part of the L-shaped hook claw, the L-shaped hook claw rotates along the hinge point, and the bottom of the L-shaped hook claw loosens the bottom plate, so that the bottom plate and the load are released together. The utility model has the characteristics of compact structure, light weight, large load, low cost and the like, and has higher engineering application value.

Description

Technical Field

[0001] The utility model relates to the technical field of unmanned aerial vehicle airdrop equipment, and in particular to an unmanned aerial vehicle load delivery device for emergency material supply. Background Art

[0002] Drones have a wide range of uses, are low cost, highly efficient, have no risk of casualties, have strong survivability, good maneuverability, and are easy to use. They have broad application prospects in many fields.

[0003] Most of the UAV mission payload delivery devices disclosed in the prior art are relatively complex in configuration, or have poor operation convenience, or have a small load capacity, or the delivery device is unreliable, or have an impact on the stability of the UAV, or are unable to quickly achieve mission payload loading, etc. In the application environment of emergency material supply, it is impossible to quickly complete the rapid loading and accurate delivery of the mission payload. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in view of the above-mentioned problems in the prior art, a UAV payload delivery device is provided which has a compact structure, is easy to operate, has a large load capacity and can be delivered accurately.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A device for delivering a load to an unmanned aerial vehicle comprises: a box, a bottom plate, an L-shaped hook, an electromagnet and a control circuit board, wherein the load to be delivered is fixed on the bottom plate, the box adopts a hollow structure with an opening at the bottom, and the top of the box is connected and fixed to the unmanned aerial vehicle; the L-shaped hook is arranged on the side of the box, the lower part of the L-shaped hook is hinged to the lower part of the box, and the bottom of the L-shaped hook is used to support the bottom plate; the electromagnet and the control circuit board are both installed on the upper part of the box, and the electromagnet is connected to the control circuit board through a cable; when the control circuit board controls the electromagnet to extend, the electromagnet abuts and limits the upper part of the L-shaped hook, and the bottom of the L-shaped hook is buckled on the bottom of the bottom plate to achieve the bottom plate covering the bottom of the box; when the control circuit board controls the electromagnet to contract, the electromagnet releases the limit on the upper part of the L-shaped hook, the L-shaped hook rotates along the hinge point, and the bottom of the L-shaped hook releases the bottom plate to achieve the delivery of the bottom plate and the load together.

[0007] As a further improvement of the utility model, it also includes an image transmission module and a camera installed on the side of the box, the camera is vertically facing downward, the camera is connected to the image transmission module through a cable, and the image transmission module is used to transmit back real-time images taken by the camera.

[0008] As a further improvement of the present invention, the box body is surrounded by long side panels, short side panels and a top panel, the inner side of the short side panels forms an inner cavity, and the inner cavity is used to accommodate the load to be dropped; the outer side of the short side panels forms an outer cavity, and the outer cavity is symmetrically arranged on both sides of the inner cavity, the L-shaped hook is located in the outer cavity, and the L-shaped hook is symmetrically arranged on both sides of the outer cavity along the vertical direction; when the electromagnet releases the limit on the upper part of the L-shaped hook, the L-shaped hook rotates toward the inner side of the outer cavity, and the bottom of the L-shaped hook releases the bottom plate to achieve the dropping of the bottom plate and the load together.

[0009] As a further improvement of the utility model, bosses with holes are symmetrically provided on both sides of the upper part of the short side plate, and a plurality of first mounting holes are provided on the upper part of the long side plate, and the bosses with holes and the first mounting holes are used to connect the electromagnet; bosses with threaded holes are symmetrically provided on both sides of the lower part of the short side plate, and the bosses with threaded holes are used to connect the L-shaped hook claws.

[0010] As a further improvement of the utility model, a mounting platform and a second mounting hole are provided at the lower part of the long side plate, the mounting platform is used to install the camera, and the second mounting hole is used to install the image transmission module.

[0011] As a further improvement of the utility model, a notch is provided at the top of the base plate, and the L-shaped hook passes through the notch and is snapped onto the bottom of the base plate; a plurality of slots are provided on the side of the base plate, and fasteners are inserted into the slots to achieve a fixed connection between the load to be dropped and the base plate.

[0012] As a further improvement of the utility model, the L-shaped hook claw includes an integrally formed hook handle and hook claw, a bearing is provided at the lower part of the hook handle, and the bearing is close to the hook claw; when installing the L-shaped hook claw, the bearing is aligned with the boss with a threaded hole, and the screw passes through the bearing and is connected to the boss with a threaded hole; the L-shaped hook claw rotates around the bearing.

[0013] As a further improvement of the utility model, the electromagnet includes an iron core and an electromagnetic assembly, and a plurality of third mounting holes are provided on the side of the electromagnetic assembly. The third mounting holes are aligned with the first mounting holes, and screws are screwed in to connect and fix the electromagnet to the box body; the electromagnetic assembly is connected to the control circuit board through a cable, and the electromagnetic assembly drives the iron core to extend or contract along the perforated boss to abut or release the upper part of the hook handle.

[0014] As a further improvement of the utility model, a retaining ring is sleeved on the iron core, and the retaining ring abuts against the inner wall of the short side plate to prevent the iron core from falling.

[0015] As a further improvement of the utility model, a control signal interface and a power supply interface are provided in the control circuit board, the control signal interface is connected to the electromagnet, and the power supply interface is connected to the power supply module in the drone.

[0016] Compared with the prior art, the advantages of the utility model are:

[0017] The payload delivery device for unmanned aerial vehicles of the present invention adopts a bottom plate and a hollow box body at the bottom to form the main structure of the delivery device. The load to be delivered is fixed on the bottom plate, and the top of the box body is connected and fixed to the unmanned aerial vehicle, so that the delivery device carrying the mission payload and the unmanned aerial vehicle are connected, and the device has the characteristics of compact structure and convenient assembly and disassembly. Furthermore, an L-shaped hook is arranged on the side of the box body, and the lower part of the L-shaped hook is hinged to the lower part of the box body, and the bottom of the L-shaped hook is used to support the bottom plate, and the connection between the box body and the bottom plate is realized by using the L-shaped hook. At the same time, an electromagnet and a control circuit board are arranged on the box body. The electromagnet is connected to the control circuit board through a cable. When the control circuit board controls the electromagnet to extend, the electromagnet is used to abut and limit the upper part of the L-shaped hook claw, so that the bottom of the L-shaped hook claw is tightly buckled on the bottom of the bottom plate, that is, the bottom plate is covered on the bottom of the box body; when the control circuit board controls the electromagnet to contract, the electromagnet releases the limit on the upper part of the L-shaped hook claw, and the L-shaped hook claw can be rotated at a certain angle along the hinge point, so that the bottom of the L-shaped hook claw releases the bottom plate, that is, the bottom plate and the load are dropped together. The load dropping process is simple to operate, and the accurate drop of the load is achieved, which well meets the on-site use needs in emergency situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structural principle of the delivery device in a specific embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of the cross-sectional structure principle of the delivery device in a specific embodiment of the utility model;

[0020] Figure 3 for Figure 2 Schematic diagram of the structural principle at A in the middle;

[0021] Figure 4 for Figure 2 Schematic diagram of the structural principle at B in the middle;

[0022] Figure 5 This is a schematic diagram of the structural principle of the box in a specific embodiment of the utility model;

[0023] Figure 6 This is a schematic diagram of the structural principle of the bottom plate in a specific embodiment of the utility model;

[0024] Figure 7 This is a schematic diagram of the structural principle of an L-shaped hook in a specific embodiment of the utility model;

[0025] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure principle in the OO direction;

[0026] Fig. 9 for Figure 8 Schematic diagram of the structural principle at C in the middle;

[0027] Fig.10 It is a schematic diagram of the partial structural principle of the L-shaped hook inverted on the bottom plate in a specific embodiment of the utility model;

[0028] Fig.11 It is a schematic diagram of the structural principle of the delivery device in a delivery state in a specific embodiment of the utility model;

[0029] Fig.12 This is a schematic diagram of the structural principle of the electromagnet in a specific embodiment of the utility model;

[0030] Fig.13 This is a schematic diagram of the structural principle of the image transmission module in a specific embodiment of the utility model;

[0031] Fig.14 This is a schematic diagram of the structural principle of a camera in a specific embodiment of the utility model;

[0032] Fig.15 It is a schematic diagram of the force analysis of the L-shaped hook in a specific embodiment of the utility model; wherein, Figure (a) is a schematic diagram of the force of the L-shaped hook, bearing and iron core in a vertical plane, and Figure (b) is a force distribution diagram of the L-shaped hook.

[0033] Legend: 1. Box body; 101. Outer cavity; 1011. Boss with hole; 1012. Boss with threaded hole; 102. Inner cavity; 1021. First mounting hole; 103. Mounting platform; 104. Second mounting hole; 105. Long side panel; 106. Short side panel; 107. Top panel; 2. Bottom panel; 201. Notch; 202. Slotted hole; 3. L-shaped hook; 301. Hook handle; 302. Bearing; 303. Screw; 304. Hook; 4. Electromagnet; 401. Iron core; 4011. Retaining ring; 402. Third mounting hole; 403. Electromagnetic assembly; 404. Screw; 5. Control circuit board; 501. Control signal interface; 502. Power interface; 6. Image transmission module; 601. Fourth mounting hole; 7. Camera; 701. Fifth mounting hole. DETAILED DESCRIPTION

[0034] The following describes the embodiments of the present invention in detail, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. Figures 1 to 15 The described embodiments are exemplary and intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0035] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "inlay" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Example

[0039] like Figures 1 to 15 As shown, the payload delivery device for a drone of the present invention comprises: a box body 1, a bottom plate 2, an L-shaped hook 3, an electromagnet 4 and a control circuit board 5. The load to be delivered is fixed on the bottom plate 2. The box body 1 adopts a hollow structure with an opening at the bottom, and the top of the box body 1 is connected and fixed to the drone. The L-shaped hook 3 is arranged on the side of the box body 1, and the lower part of the L-shaped hook 3 is hinged to the lower part of the box body 1, and the bottom of the L-shaped hook 3 is used to support the bottom plate 2. The electromagnet 4 and the control circuit board 5 are both installed on the upper part of the box body 1, and the electromagnet 4 is connected to the control circuit board 5 via a cable. As shown Figure 1 As shown, when the control circuit board 5 controls the electromagnet 4 to extend, the electromagnet 4 abuts against the upper part of the L-shaped hook 3 to limit the position, and the bottom of the L-shaped hook 3 is buckled on the bottom of the bottom plate 2 to achieve the bottom plate 2 covering the bottom of the box body 1. Fig.11 As shown, when the control circuit board 5 controls the electromagnet 4 to contract, the electromagnet 4 releases the limit on the upper part of the L-shaped hook 3, the L-shaped hook 3 rotates along the hinge point, and the bottom of the L-shaped hook 3 releases the bottom plate 2 to achieve the release of the bottom plate 2 together with the load.

[0040] In this embodiment, the main structure of the delivery device is formed by using a bottom plate 2 and a hollow box 1 at the bottom, the load to be delivered is fixed on the bottom plate 2, and the top of the box 1 is connected and fixed to the drone, that is, the connection between the delivery device carrying the mission load and the drone is realized, which has the characteristics of compact structure and convenient assembly and disassembly. Furthermore, an L-shaped hook 3 is provided on the side of the box 1, and the lower part of the L-shaped hook 3 is hinged to the lower part of the box 1, and the bottom of the L-shaped hook 3 is used to support the bottom plate 2, and the connection between the box 1 and the bottom plate 2 is realized by using the L-shaped hook 3. At the same time, an electromagnet 4 and a control circuit board 5 are also arranged on the box body 1. The electromagnet 4 is connected to the control circuit board 5 through a cable. When the control circuit board 5 controls the electromagnet 4 to extend, the electromagnet 4 is used to abut and limit the upper part of the L-shaped hook claw 3, so that the bottom of the L-shaped hook claw 3 is tightly buckled on the bottom of the bottom plate 2, that is, the bottom plate 2 is covered on the bottom of the box body 1; when the control circuit board 5 controls the electromagnet 4 to contract, the electromagnet 4 releases the limit on the upper part of the L-shaped hook claw 3, and the L-shaped hook claw 3 can be rotated at a certain angle along the hinge point, so that the bottom of the L-shaped hook claw 3 releases the bottom plate 2, that is, the bottom plate 2 is dropped together with the load, and the load dropping process is simple to operate, and the accurate drop of the load is achieved, which well meets the on-site use requirements in emergency situations.

[0041] like Figure 1 and Fig.11 As shown, it also includes an image transmission module 6 and a camera 7 installed on the side of the box 1. The camera 7 is vertically downward and is used to shoot the picture of the delivery location. The camera 7 is connected to the image transmission module 6 through a cable. The image transmission module 6 is used to transmit the real-time picture taken by the camera 7, so that the operator can understand the delivery status of the load in real time and improve the accuracy of the load delivery.

[0042] like Figure 5 As shown, the box body 1 is enclosed by two long side plates 105, two short side plates 106 and a top plate 107. The inner sides of the short side plates 106, the inner sides of the long side plates 105 and the inner sides of the top plate 107 enclose an inner cavity 102, which is used to accommodate the load to be released; the outer sides of the short side plates 106, the inner sides of the long side plates 105 and the inner sides of the top plate 107 enclose an outer cavity 101, and the volume of the outer cavity 101 is smaller than that of the inner cavity 102. The outer cavity 101 is symmetrically arranged on both sides of the inner cavity 102, and the L-shaped hooks 3 are located in the outer cavity 101, and the L-shaped hooks 3 are symmetrically arranged on both sides of the outer cavity 101 along the vertical direction, that is, a total of four L-shaped hooks 3 are arranged on the side of the box body 1 to support the four vertices of the bottom plate 2. The long side plate 105 limits the L-shaped hook 3 to prevent the L-shaped hook 3 from rotating toward the outside of the outer cavity 101, that is, the L-shaped hook 3 can rotate around the axis within a limited angle range under the restriction of the side wall of the long side plate 105. Fig.11As shown, when the electromagnet 4 releases the limit on the upper part of the L-shaped hook 3, the two L-shaped hooks 3 located in the same outer cavity 101 both rotate toward the inner side of the outer cavity 101, and the bottom of the L-shaped hook 3 releases the bottom plate 2 to achieve the release of the bottom plate 2 together with the load.

[0043] Furthermore, the short side panels 106, the long side panels 105 and the top panel 107 all adopt a hollow structure, which can reduce the deadweight of the box body 1 as much as possible and increase the load capacity while ensuring the structural strength of the box body 1.

[0044] like Figure 3 and Figure 5 As shown, the short side plate 106 has symmetrically disposed bosses 1011 with holes on both sides of the upper part, and the long side plate 105 has a plurality of first mounting holes 1021 on the upper part. The bosses 1011 with holes and the first mounting holes 1021 are used to connect the electromagnet 4. Figure 4 and Figure 5 As shown, bosses 1012 with threaded holes are symmetrically provided on both sides of the lower part of the short side plate 106 , and the bosses 1012 with threaded holes are used to connect the L-shaped hook claws 3 .

[0045] like Figure 1 and Figure 5 As shown, a mounting platform 103 and a second mounting hole 104 are provided at the lower part of the long side plate 105. The mounting platform 103 is used to mount the camera 7, and the second mounting hole 104 is used to mount the image transmission module 6. Fig.13 As shown, the image transmission module 6 is provided with a plurality of fourth mounting holes 601. The fourth mounting holes 601 are aligned with the second mounting holes 104, and fasteners are screwed in, so that the image transmission module 6 is connected and fixed to the long side plate 105. Fig.14 As shown, the camera 7 is provided with a plurality of fifth mounting holes 701. The fifth mounting holes 701 are aligned with the mounting platform 103, and fasteners are screwed in, so that the camera 7 is connected and fixed to the long side plate 105.

[0046] like Figure 6 As shown, the four vertices of the bottom plate 2 are provided with notches 201, and the L-shaped hooks 3 pass through the notches 201 and snap onto the bottom of the bottom plate 2. The side of the bottom plate 2 is provided with a plurality of slots 202, and straps or rubber bands are inserted into the slots 202 to fix the load, so as to achieve a fixed connection between the load to be dropped and the bottom plate 2.

[0047] like Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown, the L-shaped hook 3 includes an integrally formed hook handle 301 and a hook 304. A bearing 302 is provided at the lower portion of the hook handle 301, and the bearing 302 is close to the hook 304. Figure 4As shown, when installing the L-shaped hook 3, align the bearing 302 with the boss 1012 with a threaded hole, and the screw 303 passes through the bearing 302 and is connected to the boss 1012 with a threaded hole. The L-shaped hook 3 rotates around the bearing 302 based on the principle of a torque lever.

[0048] like Figure 2 , Figure 3 and 12 As shown, the electromagnet 4 includes an iron core 401 and an electromagnetic assembly 403. A plurality of third mounting holes 402 are provided on the side of the electromagnetic assembly 403. The third mounting holes 402 are aligned with the first mounting holes 1021, and screws 404 are screwed in to achieve the connection and fixation of the electromagnet 4 with the box body 1. The electromagnetic assembly 403 is connected to the control circuit board 5 through a cable. The electromagnetic assembly 403 drives the iron core 401 to extend or contract along the perforated boss 1011 to abut or release the upper part of the hook handle 301, as shown in FIG. Fig.10 and Fig.11 as shown in .

[0049] In this embodiment, the L-shaped hook 3 is fixed to the boss 1012 with threaded holes by screws 303, and the hook handle 301 is blocked by the iron core 401 and the side wall of the long side plate 105, and the hook 304 can only rotate within a small angle range. When a delivery command is sent to the control circuit board 5, the control circuit will turn on the power of the electromagnetic component 403, and the electromagnetic component 403 will suck the iron core 401, and the hook handle 301 of the L-shaped hook 3 will lose its obstruction, and the bottom plate 2 and the task load will fall downward under the action of gravity. At this time, the hook 304 is still in contact with the bottom plate 2, and the L-shaped hook 3 is rotated around the bearing 302 by the action of the bottom plate 2 until it rotates to a certain angle, so that the hook 304 is completely separated from the bottom plate 2, and the task load delivery is completed.

[0050] Figure 3 and Fig.12 As shown, a retaining ring 4011 is sleeved on the iron core 401 , and the retaining ring 4011 abuts against the inner wall of the short side plate 106 to prevent the iron core 401 from falling.

[0051] like Figure 1 As shown, a control signal interface 501 and a power interface 502 are provided in the control circuit board 5. The control signal interface 501 is connected to the electromagnet 4, and the power interface 502 is connected to the power module in the drone.

[0052] like Fig.15As shown, the forces on the L-shaped hook 3, the bearing 302 and the iron core 401 in the vertical plane are schematically shown. When the total mass of the base plate 2 and the load is m kg, the gravity of the base plate 2 and the load is mg N (g is the acceleration due to gravity), and the vertical force value G of the four L-shaped hooks 3 is mg / 4 N. When the angle between the long arm of the L-shaped hook 3 and the acceleration due to gravity is set to α°, and α is set within a range of ±10°, the horizontal component of the force value G of the L-shaped hook 3 is G3=G×Arctan(α / 180×π)=mg / 4×Arctan(α / 180×π). According to the known moment balance formula, the force F applied by the L-shaped hook 3 to the iron core 401, the horizontal component G3 of the force value G of the L-shaped hook 3, and the levers L1 and L3 rotating around the bearing 302 have the following relationship: F×L1=G3×L2, and if the lever L1>lever L2, the force F<force G3 can be achieved. If the L-shaped hook 3 is also made of steel, the static friction coefficient μs between the L-shaped hook 3 and the iron core 401 is about 0.15 (refer to the known friction coefficient standard), and the static friction force fs=μs×F=μs×G3×L2 / L1=mg / 4×Arctan(α / 180×π)×L2 / L1. When the force arm L1 is set to be larger than the force arm L2, and the static friction coefficient μs is equal to 0.15 and less than 1.0, the electromagnetic component 403 needs to generate a smaller electromagnetic pulling force fl whose value is equal to the static friction force fs and in the opposite direction to reliably pull the iron core 401 in. After the hook handle 301 loses the obstruction of the iron core 401, the torque balance state is broken, and the base plate 2 and the load drive the L-shaped hook claw 3 to rotate freely around the bearing 302 under the action of gravity. When the rotation angle is large enough, the hook claw 304 is completely separated from the base plate 2, and the load is dropped.

[0053] The working principle of the drone payload delivery device of this embodiment is as follows: when the control circuit board 5 receives a delivery signal, the control circuit will turn on the power supply of the electromagnetic component 403, and the electromagnetic component 403 will suck in the iron core 401. After the hook handle 301 loses the obstruction of the iron core 401, the base plate 2 and the load drive the L-shaped hook 3 to rotate around the bearing 302 under the action of gravity. When the rotation angle is large enough, the hook 304 is completely separated from the base plate 2, and the delivery is completed; when loading the mission load, first fix the mission load on the base plate 2 to ensure that the L-shaped hook 3 is in an open state, send the base plate 2 into the inner cavity 102, and then push the L-shaped hook 3 to a vertical state, and the hook 304 buckles the base plate 2. At this time, the delivery signal is turned off, the control circuit disconnects the power supply of the electromagnetic component 403, and the iron core 401 resets and extends to block the hook handle 301 to prevent the L-shaped hook 3 from rotating.

[0054] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A drone payload delivery device, characterized in that: include: A box (1), a bottom plate (2), an L-shaped hook (3), an electromagnet (4) and a control circuit board (5); the load to be dropped is fixed on the bottom plate (2); the box (1) adopts a hollow structure with an open bottom; the top of the box (1) is connected and fixed to the drone; the L-shaped hook (3) is arranged on the side of the box (1); the lower part of the L-shaped hook (3) is hinged to the lower part of the box (1); the bottom of the L-shaped hook (3) is used to support the bottom plate (2); the electromagnet (4) and the control circuit board (5) are both installed on the upper part of the box (1); the electromagnet (4) is connected to the drone through a cable The electromagnet (4) is connected to the control circuit board (5); when the control circuit board (5) controls the electromagnet (4) to extend, the electromagnet (4) abuts against and limits the upper part of the L-shaped hook (3), and the bottom of the L-shaped hook (3) is buckled on the bottom of the bottom plate (2), so that the bottom plate (2) covers the bottom of the box body (1); when the control circuit board (5) controls the electromagnet (4) to contract, the electromagnet (4) releases the limit on the upper part of the L-shaped hook (3), the L-shaped hook (3) rotates along the hinge point, and the bottom of the L-shaped hook (3) releases the bottom plate (2), so that the bottom plate (2) and the load are dropped together.

2. The UAV payload delivery device according to claim 1, characterized in that: It also includes an image transmission module (6) and a camera (7) installed on the side of the box (1), wherein the camera (7) faces vertically downward, and the camera (7) is connected to the image transmission module (6) via a cable, and the image transmission module (6) is used to transmit back real-time images captured by the camera (7).

3. The UAV payload delivery device according to claim 2, characterized in that: The box body (1) is formed by enclosing a long side plate (105), a short side plate (106) and a top plate (107); an inner cavity (102) is formed on the inner side of the short side plate (106); the inner cavity (102) is used to accommodate a load to be dropped; an outer cavity (101) is formed on the outer side of the short side plate (106); the outer cavity (101) is symmetrically arranged on both sides of the inner cavity (102); the L-shaped hook claw (3) is located in the outer cavity (101), and the L-shaped hook claw (3) is symmetrically arranged on both sides of the outer cavity (101) along the vertical direction; when the electromagnet (4) releases the limit on the upper part of the L-shaped hook claw (3), the L-shaped hook claw (3) rotates toward the inner side of the outer cavity (101), and the bottom of the L-shaped hook claw (3) releases the bottom plate (2), so that the bottom plate (2) and the load are dropped together.

4. The UAV payload delivery device according to claim 3, characterized in that: The upper part of the short side plate (106) is symmetrically provided with bosses with holes (1011), and the upper part of the long side plate (105) is provided with a plurality of first mounting holes (1021), and the bosses with holes (1011) and the first mounting holes (1021) are used to connect the electromagnet (4); the lower part of the short side plate (106) is symmetrically provided with bosses with threaded holes (1012), and the bosses with threaded holes (1012) are used to connect the L-shaped hook claw (3).

5. The UAV payload delivery device according to claim 3, characterized in that: A mounting platform (103) and a second mounting hole (104) are provided at the lower portion of the long side plate (105); the mounting platform (103) is used to mount a camera (7), and the second mounting hole (104) is used to mount an image transmission module (6).

6. The UAV payload delivery device according to claim 4, characterized in that: A notch (201) is provided at the top of the bottom plate (2), and the L-shaped hook claw (3) passes through the notch (201) and is engaged with the bottom of the bottom plate (2); a plurality of slot holes (202) are provided on the side of the bottom plate (2), and fasteners are inserted into the slot holes (202) to achieve fixed connection between the load to be placed and the bottom plate (2).

7. The UAV payload delivery device according to claim 6, characterized in that: The L-shaped hook claw (3) comprises an integrally formed hook handle (301) and a hook claw (304); a bearing (302) is provided at the lower part of the hook handle (301), and the bearing (302) is close to the hook claw (304); when installing the L-shaped hook claw (3), the bearing (302) is aligned with the boss with a threaded hole (1012), and the screw (303) passes through the bearing (302) and is connected to the boss with a threaded hole (1012); the L-shaped hook claw (3) rotates around the bearing (302).

8. The UAV payload delivery device according to claim 7, characterized in that: The electromagnet (4) comprises an iron core (401) and an electromagnetic assembly (403); a plurality of third mounting holes (402) are provided on the side of the electromagnetic assembly (403); the third mounting holes (402) are aligned with the first mounting holes (1021), and screws (404) are screwed in to achieve connection and fixation between the electromagnet (4) and the box (1); the electromagnetic assembly (403) is connected to the control circuit board (5) via a cable; the electromagnetic assembly (403) drives the iron core (401) to extend or contract along the boss with holes (1011) to abut against or release the upper part of the hook handle (301).

9. The UAV payload delivery device according to claim 8, characterized in that: A retaining ring (4011) is sleeved on the iron core (401), and the retaining ring (4011) abuts against the inner wall of the short side plate (106) to prevent the iron core (401) from falling.

10. The UAV payload delivery device according to any one of claims 1 to 9, characterized in that: The control circuit board (5) is provided with a control signal interface (501) and a power supply interface (502); the control signal interface (501) is connected to the electromagnet (4); and the power supply interface (502) is connected to a power supply module in the drone.

Images