阅读说明：本技术 农业无人机及其水箱 (Agricultural unmanned aerial vehicle and water tank thereof ) 是由 周万仁 常子敬 周乐 于 2018-08-13 设计创作，主要内容包括：一种农业无人机的水箱(10),用于挂载在农业无人机的机架(20)上,水箱(10)包括：箱体(101)、压力传感器(301)和非接触式通信标签(302)；压力传感器(301)安装于箱体(101)的底部(1012),用于测量箱体(101)内液体的体积；非接触式通信标签(302)安装于箱体(101)上、并与压力传感器(301)电连接,非接触式通信标签(302)用于在与机架(20)上安装的通信读卡器(401)通信时为压力传感器(301)供电,以获取压力传感器(301)测量到的箱体(10)内液体的体积并将体积发送给通信读卡器(401)。(A water tank (10) of an agricultural unmanned aerial vehicle for mounting on a frame (20) of the agricultural unmanned aerial vehicle, the water tank (10) comprising: the device comprises a box body (101), a pressure sensor (301) and a non-contact communication tag (302); the pressure sensor (301) is arranged at the bottom (1012) of the box body (101) and is used for measuring the volume of liquid in the box body (101); the non-contact communication tag (302) is mounted on the box body (101) and electrically connected with the pressure sensor (301), and the non-contact communication tag (302) is used for supplying power to the pressure sensor (301) when communicating with a communication card reader (401) mounted on the rack (20) so as to acquire the volume of liquid in the box body (10) measured by the pressure sensor (301) and send the volume to the communication card reader (401).)

1. The utility model provides an agricultural unmanned aerial vehicle's water tank for the carry is in agricultural unmanned aerial vehicle's the frame, its characterized in that, the water tank includes: the device comprises a box body, a pressure sensor and a non-contact communication tag;

the pressure sensor is arranged at the bottom of the box body and used for measuring the volume of liquid in the box body;

the non-contact communication tag is arranged on the box body and electrically connected with the pressure sensor, and is used for supplying power to the pressure sensor when communicating with a communication card reader arranged on the rack so as to obtain the volume of liquid in the box body measured by the pressure sensor and send the volume to the communication card reader.

2. The water tank as recited in claim 1, wherein the contactless communication tag is in continuous communication with the communication reader to continuously power the pressure sensor.

3. The water tank as recited in claim 1, wherein the contactless communication tag intermittently communicates with the communication reader to intermittently power the pressure sensor.

4. The water tank of claim 1 wherein the pressure sensor is mounted with the contactless communication tag to form an integrated sensing assembly.

5. The water tank of claim 4, wherein the contactless communication tag is mounted on a surface of the pressure sensor facing away from the tank body.

6. The water tank as claimed in claim 4, wherein a mounting hole is formed at the bottom of the tank body, the sensing assembly is mounted at the mounting hole, and the pressure sensor extends into the mounting hole.

7. The tank of claim 6, wherein the sensor assembly further comprises a connector for securing with the bottom of the tank body, the contactless communication tag and the pressure sensor being mounted to the connector.

8. The water tank as claimed in claim 7, wherein the connector is detachably connected to the bottom of the tank body.

9. The water tank as claimed in claim 8, wherein the connector is screw-coupled to the bottom of the tank body.

10. The water tank as claimed in claim 8, wherein the connector is connected to the bottom of the tank body by a snap fit.

11. The water tank as claimed in claim 7, wherein a sealing member is provided between the connection member and the bottom of the tank body.

12. The water tank of claim 11 wherein the seal is a gasket.

13. The water tank as claimed in claim 7, wherein the connection member includes a sealing cover, and the non-contact communication tag and the pressure sensor are provided at an inner side of the sealing cover.

14. The water tank as claimed in claim 13, wherein the sealing cover is provided at an inner side thereof with a receiving groove, and the non-contact communication tag and the pressure sensor are provided in the receiving groove.

15. The water tank as claimed in claim 13, wherein the connector further comprises a fixing cover, a through hole is formed in the middle of the fixing cover, the sealing cover is inserted into the through hole, and the fixing cover is detachably connected to the bottom of the tank body.

16. The water tank as claimed in claim 15, wherein a lug is protruded from the bottom of the tank body toward the outside, the lug is disposed around the mounting hole, and the fixing cover is detachably coupled to the lug.

17. The water tank as claimed in claim 7, wherein the bottom of the tank body is provided with a leg protruding from the bottom of the tank body to a height greater than a height of the connector protruding from the bottom of the tank body, so as to protect the contactless communication tag and the pressure sensor.

18. The water tank as claimed in claim 17, wherein the legs are plural, and the connection member is located between the plural legs.

19. The water tank of claim 17, wherein the leg is removably connected to the bottom of the tank body;

or/and the non-contact communication tag is an NFC tag or an RFID tag.

20. An agricultural drone, comprising: a frame and a water tank;

the water tank includes: the device comprises a box body, a pressure sensor and a non-contact communication tag;

the pressure sensor is arranged at the bottom of the box body and used for measuring the volume of liquid in the box body;

the non-contact communication tag is arranged on the box body and is electrically connected with the pressure sensor;

a communication card reader is arranged on the rack at a position close to the non-contact communication tag of the water tank and is in communication connection with a flight control system arranged on the rack;

the non-contact communication tag is used for supplying power to the pressure sensor when communicating with a communication card reader arranged on the rack so as to acquire the volume of liquid in the box body measured by the pressure sensor and send the volume to the communication card reader.

21. The agricultural drone of claim 20, wherein the contactless communication tag is in continuous communication with the communication reader to continuously power the pressure sensor;

or/and the non-contact communication tag is an NFC tag or an RFID tag.

22. The agricultural drone of claim 20, wherein the contactless communication tag communicates intermittently with the communication reader so as to intermittently power the pressure sensor.

23. The agricultural drone of claim 20, wherein the pressure sensor and the contactless communication tag are mounted together to form an integral sensing assembly.

24. The agricultural drone of claim 23, wherein the contactless communication tag is mounted on a surface of the pressure sensor that faces away from the tank.

25. The agricultural unmanned aerial vehicle of claim 23, wherein a mounting hole is formed in the bottom of the box body, the sensing assembly is mounted at the mounting hole, and the pressure sensor extends into the mounting hole.

26. The agricultural drone of claim 25, wherein the sensing assembly further comprises a connector for securing with the bottom of the tank, the contactless communication tag and the pressure sensor being mounted on the connector.

27. The agricultural drone of claim 26, wherein the connector is removably connected to the bottom of the tank.

28. The agricultural drone of claim 27, wherein the connector is threaded to the bottom of the tank.

29. The agricultural drone of claim 27, wherein the connector is snap-fit to the bottom of the tank.

30. An agricultural drone according to claim 26, wherein a seal is provided between the connector and the bottom of the tank.

31. The agricultural drone of claim 30, wherein the seal is a seal ring.

32. An agricultural drone according to claim 26, wherein the connector includes a sealing cover, the contactless communication tag and the pressure sensor being located inside the sealing cover.

33. The agricultural drone of claim 32, wherein the sealing cap has a receiving groove on an inside thereof, the contactless communication tag and the pressure sensor being located in the receiving groove.

34. The agricultural unmanned aerial vehicle of claim 32, wherein the connector further comprises a fixing cover, a through hole is formed in the middle of the fixing cover, the sealing cover is embedded into the through hole, and the fixing cover is detachably connected with the bottom of the box body.

35. The agricultural drone of claim 34, wherein the bottom of the tank body protrudes outward to form a lug, the lug is disposed around the mounting hole, and the fixed cover is detachably connected to the lug.

36. The agricultural drone of claim 26, wherein the bottom of the box is provided with feet that protrude a greater height than the connector protrudes from the bottom of the box to protect the contactless communication tag and the pressure sensor.

37. The agricultural drone of claim 36, wherein the support feet are plural in number, the connector being located between the plural support feet.

38. The agricultural drone of claim 36, wherein the feet are removably connected to the bottom of the tank.

39. An agricultural drone according to any one of claims 20 to 38, wherein the communication card reader is connected to the flight control system by a communication line.

40. The agricultural drone of claim 39, wherein the communication line is threaded within the hollow frame.

41. An agricultural drone according to any one of claims 20 to 38, wherein the communication card reader is wirelessly connected to the flight control system.

42. The agricultural drone of claim 41, wherein a frequency of communication of the communication reader with the flight control system is different than a frequency of communication of the communication reader with the contactless communication tag.

43. The agricultural drone of claim 41, wherein the flight control system controls communication of the communication reader with the flight control system and communication of the communication reader with the contactless communication tag to alternate.

44. The agricultural drone of claim 41, wherein the flight control system controls the communication reader to periodically communicate with the contactless communication tag.

45. An agricultural drone according to any one of claims 20 to 38, wherein the chassis includes: the communication card reader is arranged on the lower frame, and when the water tank passes through an upper opening defined by the upper frame and is mounted on the rack, the communication card reader is positioned below the non-contact communication tag.

46. An agricultural drone according to claim 45, wherein a portion of the top of the tank that exceeds the side walls of the tank is carried on the upper frame.

Technical Field

The invention relates to an agricultural unmanned aerial vehicle and a water tank thereof, and belongs to the technical field of agricultural machinery.

Background

Along with the development of unmanned aerial vehicles and agricultural technologies, agricultural unmanned aerial vehicles are increasingly being used in agricultural production due to the characteristics of high efficiency, convenience and the like. An existing agricultural unmanned aerial vehicle for fertilizing, watering or spraying pesticide generally has a water tank mounted on a machine frame of the agricultural unmanned aerial vehicle, and liquid in the water tank is sprayed out from a nozzle under the action of a pump and then can be attached to blades of crops. However, since the water tank is generally mounted on the frame by fasteners such as screws, but all require quick disassembly in order to improve the efficiency of the operation, the volume of the liquid in the water tank cannot be accurately measured by the existing agricultural unmanned aerial vehicle, and thus the accuracy of the operation is difficult to improve.

Disclosure of Invention

In order to solve the above or other potential problems in the prior art, an embodiment of the present invention provides an agricultural unmanned aerial vehicle and a water tank thereof.

According to some embodiments of the invention, there is provided a water tank of an agricultural drone, for mounting on a frame of the agricultural drone, the water tank comprising: the device comprises a box body, a pressure sensor and a non-contact communication tag; the pressure sensor is arranged at the bottom of the box body and used for measuring the volume of liquid in the box body; the non-contact communication tag is arranged on the box body and electrically connected with the pressure sensor, and is used for supplying power to the pressure sensor when communicating with a communication card reader arranged on the rack so as to obtain the volume of liquid in the box body measured by the pressure sensor and send the volume to the communication card reader.

According to some embodiments of the invention, there is provided an agricultural drone comprising: a frame and a water tank; the water tank includes: the device comprises a box body, a pressure sensor and a non-contact communication tag; the pressure sensor is arranged at the bottom of the box body and used for measuring the volume of liquid in the box body; the non-contact communication tag is arranged on the box body and is electrically connected with the pressure sensor; a communication card reader is arranged on the rack at a position close to the non-contact communication tag of the water tank and is in communication connection with a flight control system arranged on the rack; the non-contact communication tag is used for supplying power to the pressure sensor when communicating with a communication card reader arranged on the rack so as to acquire the volume of liquid in the box body measured by the pressure sensor and send the volume to the communication card reader.

According to the scheme of the embodiment of the invention, the pressure sensor is arranged at the bottom of the tank body of the water tank to measure the volume of the liquid in the tank body, and meanwhile, the pressure sensor is electrically connected with the non-contact communication tag, so that the pressure sensor can be supplied with power through induced current generated by communication between the communication card reader and the non-contact communication tag, a joint electrically connected with a rack of the agricultural unmanned aerial vehicle is not required to be arranged on the tank body, the safety is ensured, the function of quickly disassembling the water tank is conveniently realized, the time for disassembling the water tank is reduced, and the operation efficiency is improved.

Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and other objects, features and advantages of the embodiments of the present invention will become more readily understood by the following detailed description with reference to the accompanying drawings. Embodiments of the invention will now be described, by way of example and not limitation, in the accompanying drawings, in which:

fig. 1 is a schematic structural view of an assembled water tank and a rack according to an embodiment of the present invention;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is an exploded view of FIG. 1;

FIG. 4 is an enlarged schematic view of a portion of the structure of FIG. 3;

FIG. 5 is a cross-sectional view of FIG. 1;

fig. 6 is an enlarged view of the position a in fig. 5.

In the figure:

10-a water tank; 101-a box body;

1011-top; 1012-bottom;

1013-side walls; 1014-liquid injection port;

1015-mounting holes; 1016-lugs;

102-tank lid; 103-a handle;

104-a leg; 20-a frame;

201-an upper frame; 2011-upper stringer;

2012-upper beam; 202-a lower frame;

2021-lower longitudinal beams; 2022-lower beam;

2023-communication card reader mounting beam; 203-a support beam;

30-a sensing component; 301-a pressure sensor;

302-a contactless communication tag; 303-a connector;

3031-sealing cap; 30311-a receiving groove;

3032-fixing cover; 304-a sealing ring;

401-a communication card reader; 402-a communication card reader cover;

403-sealing ring.

Detailed Description

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Further, in the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Fig. 1 is a schematic structural view of the assembled water tank and rack provided in this embodiment; FIG. 2 is a front view of FIG. 1; FIG. 3 is an exploded view of FIG. 1; FIG. 4 is an enlarged schematic view of a portion of the structure of FIG. 3; FIG. 5 is a cross-sectional view of FIG. 1; fig. 6 is an enlarged view of the position a in fig. 5.

As shown in fig. 1 to 3, the embodiment provides an agricultural unmanned aerial vehicle and can install water tank 10 on this agricultural unmanned aerial vehicle's frame 20 fast in the dismouting to improve the volume measurement precision of liquid in the water tank 10, thereby carry out more accurate control to operation processes such as agricultural unmanned aerial vehicle fertilization, watering, application of pesticides. It should be noted that, components such as a rotor assembly, a power supply, a flight control system and the like of the agricultural unmanned aerial vehicle are omitted in fig. 1 to 3, and these components are conventional components of the unmanned aerial vehicle and are not described again here.

Referring to fig. 1 to 3, the unmanned aerial vehicle of the present embodiment includes: a frame 20 and a water tank 10, the water tank 10 can be quickly mounted on the frame 20 and can be quickly dismounted from the frame 20. The water tank 10 includes a tank body 101, a pressure sensor 301, and a contactless communication tag 302. The pressure sensor 301 is installed at the bottom 1012 of the tank 10 to detect the pressure of the liquid in the tank 101, thereby obtaining the volume of the liquid in the tank 101. The noncontact communication tag 302 is mounted on the tank 101 and electrically connected to the pressure sensor 301 to acquire the volume of the liquid in the tank 101 detected by the pressure sensor 301. A communication reader 401 is mounted on the chassis 20 near the contactless communication tag 302, and is used for communicating with the contactless communication tag 302 on the tank 101 under the control of the flight control system, so as to read the volume of the liquid in the tank 101, which is obtained by the contactless communication tag 302 from the pressure sensor 301. Further, when the contactless communication tag 302 passively communicates with the communication reader 401, it generates an induced current by itself and supplies a part of the induced current to the pressure sensor 301 to operate the pressure sensor 301, thereby detecting the volume of the liquid in the tank 101 and transmitting it to the contactless communication tag 302. After the communication card reader 401 reads the volume of the liquid in the box 101 received by the non-contact communication tag 302, the volume can be transmitted to the flight control system in a wired or wireless mode, so that the flight control system can adjust the whole operation process according to the volume, and the operation precision is improved.

The contactless communication tag 302 may be an NFC tag, an RFID tag, or the like, and accordingly, the communication reader 401 is an NFC reader, an RFID reader, or the like. Specifically, in the illustrated embodiment, the communication tag 302 is described by taking an NFC tag as an example, and the communication card reader 401 is described by taking an NFC card reader as an example. Agricultural unmanned aerial vehicles are illustrated with a multi-rotor unmanned aerial vehicle as an example.

Specifically, in this embodiment, the case 101 may be made of plastic, stainless steel, or other material into a square or circular shape by injection molding, die pressing, casting, or other processes. As shown in fig. 1-3, the case 101 includes a top 1011, a bottom 1012, and a sidewall 1013 between the top 1011 and the bottom 1012. A liquid inlet 1015 for injecting liquid such as water, fertilizer, or agricultural chemicals into the casing 101 is opened at the top 1011 of the casing 101. In order to prevent the liquid in the case 101 from spilling and to prevent dust, insects, leaves, or the like from falling into the case 101 from the liquid pouring port 1015, the tank lid 102 is detachably attached to the liquid pouring port 1015. For example, a circle of protrusion may be formed along the edge of the liquid filling opening 1015, a part of external thread or a snap structure may be formed on the protrusion, and another part of internal thread or a snap structure may be formed on the water tank cover 102, so as to detachably mount the water tank cover 102 to the liquid filling opening 1015 by means of screw connection or snap connection. It is understood that, in order to avoid the tank cover 102 being lost, the tank cover 102 and the tank body 101 may be connected by a flexible rope-like member, for example, a connecting ring may be provided on each of the tank body 101 and the tank cover 102, and both ends of a nylon rope may be respectively passed through the connecting rings on the tank body 101 and the tank cover 102 and tied together. Optionally, a handle 103 is also provided at the top 1011 of the tank 101 to facilitate the user's carrying of the tank 10.

As shown in fig. 3 to 6, the pressure sensor 301 attached to the bottom 1012 of the case 101 may be a varistor type pressure sensor, a ceramic pressure sensor, a diffused silicon pressure sensor, a sapphire pressure sensor, a piezoelectric pressure sensor, or the like. The pressure sensor 301 is generally composed of a pressure sensing element and a signal processing unit, the pressure sensor 301 is mounted on the bottom 1012 of the housing 101, so that the pressure of the liquid in the housing 101 can be sensed by the pressure sensing element, and the signal processing unit converts the pressure signal sensed by the pressure sensing element into a usable electric signal and outputs the usable electric signal to the contactless communication tag 302 electrically connected to the pressure sensor 301.

With continued reference to fig. 3 to 6, the contactless communication tag 302 electrically connected to the pressure sensor 301 and supplying power to the pressure sensor 301 may be installed below the pressure sensor 301, that is, the contactless communication tag 302 is also installed at the bottom 1012 of the case 101, so as to reduce the length of a connection line for electrically connecting the pressure sensor 301 and the contactless communication tag 302, thereby reducing the loss of induced current on the connection line, so as to ensure that the contactless communication tag 302 can generate enough induced current to operate itself and the pressure sensor 301 when communicating with the communication reader 401, thereby realizing the measurement of the volume of the liquid in the case 101. Accordingly, when the contactless communication tag 302 is mounted on the bottom 1012 of the housing 101, the communication reader 401 communicating with the contactless communication tag 302 is correspondingly disposed below the contactless communication tag 302, so as to improve the communication quality between the communication reader 401 and the contactless communication tag 302. Specifically, a communication card reader mounting beam 2023 may be provided at the bottom 1012 of the housing 20 as described below for mounting the communication card reader 401 so that the distance between the communication card reader 401 and the contactless communication tag 302 is within a suitable range, thereby improving the communication quality between the two.

Of course, in other examples, the contactless communication tag 302 may be mounted in other suitable positions of the housing 101. For example, the contactless communication tag 302 may be mounted on the top 1011 of the housing 101, and electrically connected to the pressure sensor 301 and power the pressure sensor 301 through connecting wires embedded in segments in the top 1011, side 1013, and bottom 1012 of the housing 101. Accordingly, a communication reader 401 that communicates with the contactless communication tag 302 is provided above the contactless communication tag 302 so as to effectively communicate with the contactless communication tag 302. For another example, the contactless communication tag 302 may be mounted on the sidewall 1013 of the casing 101, and the pressure sensor 301 may be electrically connected to the contactless communication tag by connecting wires embedded in the sidewall 1013 and the bottom 1012 of the casing 101 in segments, so as to supply power to the contactless communication tag 301. Accordingly, a communication reader 401 for communicating with the contactless communication tag 302 is provided on the side of the contactless communication tag 302 so as to communicate with the contactless communication tag 302.

In the present embodiment, the contactless communication tag 302 may be any commercially available type and model of contactless communication tag 302, or a homemade contactless communication tag 302 may be used. The contactless communication tag 302 may be a separate component or may be an NFC coil soldered or formed directly on a circuit board.

The communication card reader 401 mounted on the rack 20 may be any communication card reader 401 adopted in the prior art, and is connected with the flight control system of the agricultural drone through a wireless communication module or a communication line, so as to actively turn on a radio frequency field under the control of the flight control system, thereby establishing a communication connection with the contactless communication tag 302, and enabling a coil in the contactless communication tag 302 to generate an induced current to provide a working current for the contactless communication tag 302 and the pressure sensor 301.

When the communication card reader 401 establishes communication connection with the flight control system through the wireless communication module, the communication frequency of the communication card reader 401 and the flight control system generally selects a frequency different from the communication frequency of the communication card reader 401 and the non-contact communication tag 302, so as to reduce interference of the two frequencies and improve respective communication quality. Optionally, the wireless communication between the communication reader 401 and the flight control system and the wireless communication between the communication reader 401 and the contactless communication tag 302 can be alternated to further reduce the possibility of communication interference between the two, thereby improving the quality of communication. It is understood that when the communication card reader 401 is in wireless communication with the flight control system, the communication card reader 401 may be configured with a separate power supply to supply power to the communication card reader 401 or the communication card reader 401 may be powered by the flight control system through wireless charging. For example, a button cell battery may be used to power the communication card reader 401.

When the communication card reader 401 is connected to the flight control system through a communication line, the communication line may be inserted into the rack 20. For example, the housing 20 may be made of a hollow rod member, and the communication line may be inserted into the rod member. Through the communication line, the flight control system can not only transmit data information with the communication card reader 401, but also supply power to the communication card reader 401. It should be understood that in some alternative examples, the communication lines used to connect the communication card reader 401 and the flight control system may also be located outside of the housing 20.

Furthermore, in the present embodiment, the frame 20 of the agricultural drone may be any suitable structure that enables quick-release water tank 10. For example, an alternative frame structure is shown in fig. 3, and the frame 20 includes an upper frame 201, a lower frame 202, and support beams 203 between the upper frame 201 and the lower frame 202. The upper frame 201 comprises two upper longitudinal beams 2011 which are oppositely arranged and two upper transverse beams 2012 which are oppositely arranged and positioned between the two upper longitudinal beams 2011; the lower frame 202 includes two side sills 2021 disposed opposite to each other and two side sills 2022 disposed opposite to each other between the two side sills 2021. A communication card reader mounting beam 2023 is provided between the two lower cross beams 2022 for mounting the communication card reader 401. The upper cross beam 2012, the lower cross beam 2022, the upper longitudinal beam 2011, the lower longitudinal beam 2021, the communication card reader mounting beam 2023, and the support beam 203 may be hollow rods. When the water tank 10 is installed, the handle 103 at the top 1011 of the water tank 10 is held, and the bottom 1012 of the water tank 10 is put into the accommodating space defined by the upper frame 201, the lower frame 202 and the support beams 203 from the upper opening defined by the upper cross beam 2012 and the upper longitudinal beam 2011 of the upper frame 201 until the part of the top 1011 of the water tank 10, which exceeds the side wall 1013, is supported on the upper cross beam 2012 and the upper longitudinal beam 2011. At this time, the contactless communication tag 302 located at the bottom 1012 of the water tank 10 faces the communication card reader 401 mounted on the communication card reader mounting beam 2023, so that effective communication between the two can be achieved. When the water tank 10 is disassembled, the handle 103 at the top 1011 of the water tank 10 is only needed to be grasped to pull out the water tank 10 from the accommodating space defined by the upper frame 201, the lower frame 202 and the supporting beam 203, which is not only convenient, but also fast and efficient.

Optionally, as shown in fig. 3, 4 and 6, the outside of the communication card reader 401 (e.g., above the communication card reader 401 in fig. 3) may be covered with a communication card reader cover 402 to prevent the communication card reader 401 from being exposed to the external environment, thereby improving the service life thereof. In order to prevent rain, snow, and the like in the external environment from entering the communication card reader 401, a seal ring 403 may be provided between the communication card reader cover 402 and the communication card reader mounting beam 2023 to improve the sealing performance between them.

Two optional ways of acquiring the volume information of the liquid in the box 101 by the agricultural unmanned aerial vehicle provided by the embodiment are briefly described as follows:

one way is that: the flight control system sends a control signal to the communication card reader 401 of the rack 20 in a wired or wireless manner, and controls the communication card reader 401 to continuously communicate with the contactless communication tag 302, so that an induced current is continuously generated by a coil in the contactless communication tag 302 and supplied to the pressure sensor 301, and the pressure sensor 301 continuously detects the liquid volume information in the box 101 and transmits the liquid volume information to the contactless communication tag 302. The contactless communication tag 302 continuously transmits the liquid volume information to the communication card reader 401 after acquiring the liquid volume information transmitted from the pressure sensor 301. The liquid volume information acquired by the communication card reader 401 is transmitted back to the flight control system in a wired or wireless mode. After the flight control system processes the liquid volume information, the operating state of the spraying pump is controlled to adjust the liquid spraying speed and the like to control the operation process, so that the operation accuracy is improved.

The other mode is as follows: the flight control system sends a control signal to the communication card reader 401 of the rack 20 in a wired or wireless mode, and controls the communication card reader 401 to intermittently communicate with the contactless communication tag 302, so that an induced current is intermittently generated by a coil in the contactless communication tag 302 and is supplied to the pressure sensor 301, the pressure sensor 301 starts to detect liquid volume information in the box 101 at the moment that the contactless communication tag 302 supplies power to the pressure sensor, and the liquid volume information is transmitted to the contactless communication tag 302. The contactless communication tag 302 acquires the liquid volume information transmitted from the pressure sensor 301 and then transmits the liquid volume information to the communication card reader 401. The liquid volume information acquired by the communication card reader 401 is transmitted back to the flight control system in a wired or wireless mode. After the flight control system processes the liquid volume information, the operating state of the spraying pump is controlled to adjust the liquid spraying speed and the like to control the operation process, so that the operation accuracy is improved. It should be understood that the intermittent communication with the contactless communication tag 302 by the communication reader 401 may be periodic, random or according to any preset schedule. For example, in the early stage of spraying, because there is more liquid in the box 101, the time interval for the communication card reader 401 to read the liquid volume information may be slightly longer; in the middle stage of spraying, the time interval for reading the liquid volume information by the communication card reader 401 can be properly shortened; at the end of the spraying, the time interval for the communication reader 401 to read the liquid volume information may be shortened again to accurately stop the spraying operation.

In the embodiment, the pressure sensor 301 is arranged at the bottom 1012 of the box body 101 to measure the volume of liquid in the box body 101, and meanwhile, the pressure sensor 301 is electrically connected with the non-contact communication tag 302, so that induced current generated by communication between the communication card reader 401 and the non-contact communication tag 302 can be used for supplying power to the pressure sensor 301, a joint electrically connected with the frame 20 of the agricultural unmanned aerial vehicle does not need to be arranged on the box body 101, the safety is ensured, the time for assembling and disassembling the water tank 10 is shortened, and the operation efficiency is improved.

Further, the pressure sensor 301 and the contactless communication tag 302 may be mounted together to form an integrated sensing assembly 30, thereby reducing assembly and replacement time and preventing fluid within the housing 101 from affecting the electrical connection of the pressure sensor 301 and the contactless communication tag 302. For example, in some alternative embodiments, the pressure sensor 301 and the contactless communication tag 302 may be encapsulated together by an insulating encapsulant. In other alternative embodiments, the pressure sensor 301 and the contactless communication tag 302 may be mounted together by other structures. For example, the contactless communication tag 302 may be mounted on a surface of the pressure sensor 301 facing away from the box 101, so as to reduce the volume of the sensing assembly 30 and achieve the requirements of miniaturization and light weight. In addition, in order to facilitate the installation of the sensing unit 30, a mounting hole may be opened in the bottom 1012 of the casing 101, the sensing unit 30 may be mounted at the mounting hole, and the pressure sensor 301 may be inserted into the mounting hole so as to be in contact with the liquid in the casing 101. Based on this, the pressure sensor 301 above the sensing assembly 30 is in direct contact with the liquid in the box 101 to measure the volume of the liquid in the box 101, and the contactless communication tag 302 below is opposite to the communication reader 401 mounted on the rack 20 to improve the ability of effective communication.

Further, as shown in fig. 3 to 6, the sensor assembly 30 further includes a connector 303, the connector 303 is used for being fixed to the bottom 1012 of the housing 101, and the contactless communication tag 302 and the pressure sensor 301 are mounted on the connector 303. By providing the connector 303, the contactless communication tag 302 and the pressure sensor 301 can be easily mounted at the mounting hole of the bottom 1012 of the housing 101.

Optionally, the connector 303 is detachably connected to the bottom 1012 of the box 101, so that the sensing assembly 30 can be detached for cleaning, so as to clean the sediment deposited on the pressure sensor 301, thereby ensuring the measurement accuracy of the pressure sensor 301. For example, the connector 303 may be threaded with the bottom 1012 of the case 101 by a threaded structure, or the connector 303 may be snap-fit with the bottom 1012 of the case 101 by a snap-fit structure. For example, the connector 303 may be externally threaded and the wall of the mounting hole may be internally threaded so that the connector 303 is threaded with the bottom 1012 of the housing 101. Or, an annular groove is formed on the wall of the connecting piece 303 or the mounting hole, correspondingly, a protrusion is formed on the wall of the mounting hole or the connecting piece 303, and when assembling, the flange is clamped into the annular groove, so that the connecting piece 303 can be detachably connected with the bottom 1012 of the box body 101.

To ensure the sealing of the sensing assembly 30 with the housing 101, a sealing member, including but not limited to a sealing ring 304, a labyrinth structure, or a sealing cover 3031 described below, may be disposed between the connecting member 303 and the bottom 1012 of the housing 101. For example, an annular sealing groove may be formed in the hole wall of the mounting hole or the connecting member 303, and the sealing ring 304 may be sleeved in the annular sealing groove, so that the connecting member 303 may be sealed from the bottom 1012 of the case 101 by a threaded connection or a snap connection.

Further, as shown in fig. 3 to 6, the connector 303 includes a fixing cover 3032 and a sealing cover 3031. The noncontact communication tag 302 and the pressure sensor 301 are provided inside the seal cover 3031. For example, a seal cover 30311 may be formed inside the seal cover 3031 so that the contactless communication tag 302 and the pressure sensor 301 are provided inside the seal cover 30311. The seal cover 30311 may be formed by forming a ring-shaped protrusion on the body of the seal cover 3031, and the shape of the seal cover 30311 may be set according to actual needs, and may be designed to be circular or oval, for example. A first step surface for carrying the contactless communication tag 302 may be formed at a lower half portion of the seal cover 30311, and a second step surface for carrying the pressure sensor 301 may be formed at an upper half portion of the seal cover 30311.

The retaining cap 3032 may be removably attached to the bottom 1012 of the housing 101, for example, by a lug 1016 extending outwardly from the bottom 1012 of the housing 101. A through hole is formed in the middle of the fixing cover 3032, and the sealing cover 3031 is inserted into the through hole. Specifically, an annular protrusion formed on the body of the seal cover 3031 is inserted into a through hole formed in the middle of the fixed cover 3032. A packing 304 may be provided between the fixed cover 3032 and the sealing cover 3031 to improve sealability. For example, a sealing groove surrounding the annular protrusion may be dug in a position adjacent to the annular protrusion, and the sealing ring 304 may be fitted in the sealing groove, so that when the annular protrusion is inserted into the through hole of the fixing cover 3032, the sealing performance of the fixing cover 3032 and the sealing cover 3031 may be enhanced. A ring of sealing groove may be formed inside the fixing cover 3032, and a sealing ring 304 is sleeved in the sealing groove to enhance the sealing performance between the fixing cover 3032 and the bottom 1012 of the case 101.

A lug 1016 formed at the bottom 1012 of the housing 101 is provided around the mounting hole, and the fixed cover 3032 is detachably coupled to the lug 1016 by means of a screw or a snap fit, etc. For example, as shown in FIG. 4, internal threads may be formed on the side walls 1013 of the retaining cap 3032 and, correspondingly, external threads may be formed on the lugs 1016 on the bottom 1012 of the housing 101 to threadably couple the retaining cap 3032 and the lugs 1016 together. At this time, the bottom end of the lug 1016 may abut against the sealing ring 304 in the stationary cover 3032 to improve sealing performance.

It should be appreciated that although the construction of the connector 303 including the seal 3031 and the stationary cover 3032 is described in detail above in connection with fig. 3-6, in alternative embodiments, only the seal 3031 may be provided and removably connected directly to the bottom 1012 of the tank 101. Meanwhile, in some alternative embodiments, the lug 1016 may not be formed on the bottom 1012 of the housing 101, for example, a mounting groove formed by recessing the bottom 1012 of the housing 101 may be formed to detachably connect with the sealing cover 3031, the fixing cover 3032 or other alternative connecting member 303 structure.

Further, referring to fig. 1 to 3, a leg 104 is further provided on the bottom 1012 of the housing 101, and the leg 104 protrudes from the bottom 1012 of the housing 101 to a height greater than that of the connector 303 protruding from the bottom 1012 of the housing 101, so as to protect the contactless communication tag 302 and the pressure sensor 301. The support may be any supporting leg 104 structure in the prior art, and may be non-detachably connected to the box 101 by means of integral molding, bonding, welding, or detachably connected by means of threads, fasteners, or the like.

Alternatively, there are a plurality of legs 104 provided at the bottom 1012 of the casing 101, and the connection member 303 is provided between the plurality of legs 104. For example, fig. 1 to 3 show that four legs 104 are provided on the bottom 1012 of the housing 101, the four legs 104 are provided at four peripheral positions of the bottom 1012 of the rectangular housing 101, and the connector 303 including the fixing cover 3032 and the sealing cover 3031 is provided at an intermediate position of the bottom 1012 of the housing 101.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, while advantages associated with certain embodiments of the technology have been described in the context of those embodiments, other embodiments may also include such advantages, and not all embodiments describe all of the advantages of the invention in detail, and all advantages resulting from the technical features of the embodiments should be construed as advantages which distinguish the invention from the prior art, and are within the scope of the invention.