WO2020107324A1

WO2020107324A1 - Electromagnetic flowmeter and plant-protecting unmanned aerial vehicle having same

Info

Publication number: WO2020107324A1
Application number: PCT/CN2018/118184
Authority: WO
Inventors: 黄稀荻; 周乐; 常子敬; 孟祥�; 潘国秀
Original assignee: 深圳市大疆创新科技有限公司
Priority date: 2018-11-29
Filing date: 2018-11-29
Publication date: 2020-06-04
Also published as: CN110785637B; CN110785637A

Abstract

An electromagnetic flowmeter (4000) and a plant-protecting unmanned aerial vehicle having the electromagnetic flowmeter (4000). The electromagnetic flowmeter (4000) comprises: a support frame (1); a pipeline (2) disposed at the support frame (1), two open ends of the pipeline (2) being exposed by the support frame (1); two electrodes (3) disposed opposite to each other at two sides of the support frame (1), wherein detection ends of the two electrodes (3) pass through side walls of the support frame (1) and the pipeline (2), respectively, and can make contact with liquid flowing in the pipeline (2), and the detection ends of the two electrodes (3) are disposed opposite to each other; two signal acquisition panels (4), the two signal acquisition panels (4) and the two electrodes (3) being correspondingly disposed at the same side of the support frame (1), and the signal acquisition panels (4) being used to acquire signals from the electrodes (3) at the side corresponding thereto; two coil components (5) being disposed opposite to each other at another two sides of the support frame (1); and a control board (6) electrically coupled and respectively connected to the two signal acquisition panels (4), and used to obtain, according to signals collected by the two signal acquisition panels (4), a flow rate and/or velocity of the liquid flowing in the pipeline (2), wherein the control board (6) and one of the signal acquisition panels (4) are integrated with each other and disposed on the same circuit board. The electromagnetic flowmeter (4000) has a compact design and reduced size, is light weight, and is applicable to plant-protecting unmanned aerial vehicles for performing spraying operations.

Description

Electromagnetic flowmeter and plant protection drone with the electromagnetic flowmeter

Technical field

The invention relates to the field of flow detection, in particular to an electromagnetic flowmeter and a plant protection drone with the electromagnetic flowmeter.

Background technique

The electromagnetic flowmeter is an instrument that uses the principle of electromagnetic induction to measure the water flow according to the induced electromotive force generated by the conductor flowing through the external magnetic field. It is widely used in agricultural plant protection operations, food processing, industrial solvent filling and other scenarios. For example, an electromagnetic flow meter can be applied to a plant protection drone, and the spray flow rate and/or spray rate of the spray assembly can be detected by the electromagnetic flow meter. Plant protection drones are very sensitive to load, and the existing electromagnetic flowmeters are limited in size, volume and weight, which is not conducive to the life of plant protection drones and also affects the installation of other components on plant protection drones.

Summary of the invention

The invention provides an electromagnetic flowmeter and a plant protection drone with the electromagnetic flowmeter.

Specifically, the present invention is achieved through the following technical solutions:

According to a first aspect of the present invention, an electromagnetic flowmeter is provided, the electromagnetic flowmeter including:

support;

A pipe, the pipe is provided on the bracket, and two open ends of the pipe are exposed outside the bracket;

Two electrodes, two of the electrodes are disposed on opposite sides of the bracket, and the detection ends of the two electrodes pass through the bracket and the side wall of the pipe, and can flow through the pipe The liquid is in contact, and the detection ends of the two electrodes are arranged oppositely;

Two signal acquisition boards, two of the signal acquisition boards and two of the electrodes are correspondingly disposed on the same side of the bracket, and the signal acquisition board is used to acquire signals of the corresponding side electrodes;

Two coil assemblies, the two coil assemblies are oppositely arranged on the other two sides of the bracket, and are used to generate an electromagnetic field; and

A control board, which is electrically coupled to the two signal acquisition boards, and used to obtain the flow rate and/or velocity of the liquid flowing through the pipeline according to the signals collected by the two signal acquisition boards;

Wherein, the control board is integrated with one of the signal acquisition boards on the same circuit board.

According to a second aspect of the present invention, there is provided a plant protection drone, the plant protection drone including:

frame;

Spraying assembly, installed on the rack;

A medicine box, mounted on the rack; and

An electromagnetic flowmeter for real-time detection of the spray flow of the spray assembly, the electromagnetic flowmeter includes a bracket, a pipe, two electrodes, two signal acquisition boards, two coil assemblies, and a control board;

The duct is provided on the bracket, and two open ends of the duct are exposed outside the bracket, one of the open ends of the duct is communicated with the spraying assembly through a diversion tube, and the other open end is through a diversion The tube is in communication with the medicine box;

The two electrodes are oppositely arranged on both sides of the bracket. After the detection ends of the two electrodes pass through the bracket and the side wall of the pipe, they can contact with the liquid flowing through the pipe. And the detection ends of the two electrodes are oppositely arranged;

Two of the signal acquisition boards and two of the electrodes are correspondingly arranged on the same side of the bracket, and the signal acquisition board is used to collect signals of the electrodes on the corresponding side;

The two coil assemblies are oppositely arranged on the other two sides of the bracket, and are used to generate an electromagnetic field;

The control board is electrically coupled to the two signal acquisition boards, and is used to obtain the flow rate and/or velocity of the liquid flowing through the pipeline according to the signals collected by the two signal acquisition boards;

It can be seen from the above technical solutions provided by the embodiments of the present invention that the structural layout of the bracket, electrodes, signal acquisition board and coil assembly and the integrated arrangement of one of the signal acquisition board and the control board increase the compactness of the structure, thereby reducing The volume of the electromagnetic flowmeter and reduce the weight of the electromagnetic flowmeter.

BRIEF DESCRIPTION

In order to more clearly explain the technical solutions in the embodiments of the present invention, the drawings required in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without paying any creative labor, other drawings can also be obtained based on these drawings.

1 is an exploded view of the structure of an electromagnetic flowmeter in an embodiment of the invention;

2 is an exploded view of the electromagnetic flowmeter of the embodiment shown in FIG. 1 in another direction;

3 is a perspective view of the electromagnetic flowmeter of the embodiment shown in FIG. 1;

4 is a cross-sectional view of an electromagnetic flowmeter in an embodiment of the invention;

5 is a partial enlarged view of the electromagnetic flowmeter of the embodiment shown in FIG. 4;

6 is a perspective view of an electrode in an embodiment of the invention;

7 is a perspective view of an electrode fixing plate in an embodiment of the invention;

8 is an assembly schematic diagram of a part of the structure of an electromagnetic flowmeter in an embodiment of the invention;

9 is a schematic structural view of the electromagnetic flowmeter of the embodiment shown in FIG. 8 in another direction;

10 is a schematic structural view of the electromagnetic flowmeter of the embodiment shown in FIG. 8 in yet another direction;

11 is a schematic structural view of the electromagnetic flowmeter of the embodiment shown in FIG. 8 in yet another direction;

12 is a schematic cross-sectional view of an electromagnetic flowmeter in an embodiment of the invention;

13 is a partial enlarged view of the electromagnetic flowmeter of the embodiment shown in FIG. 12;

14 is another partial enlarged view of the electromagnetic flowmeter of the embodiment shown in FIG. 12;

15 is a perspective view of a partial structure of an electromagnetic flowmeter in an embodiment of the invention;

16 is a perspective view of a plant protection drone in an embodiment of the invention.

Reference signs: 1000: frame; 1100: body; 1200: tripod; 1300: arm; 2000: spray assembly; 3000: medicine box; 4000: electromagnetic flowmeter; 1: bracket; 11: electrode mounting hole; 12: accommodating groove; 13: positioning and matching part; 2: pipe; 3: electrode; 31: electrical connection hole; 32: boss; 33: first step part; 4: signal acquisition board; 41: conductive hole; 5 : Coil assembly; 51: spiral coil; 511: iron core; 512: coil; 52: coil fixing plate; 6: control board; 61: ground jack; 62: second electrical connection; 7: electrode fixing plate; 71 : First through hole; 72: positioning hole; 8: housing; 81: housing; 811: second mounting boss; 8111: mounting groove; 812: second mounting hole; 82: cover plate; 821: second positioning Part; 822: grounding protrusion; 823: first mounting boss; 824: first mounting hole; 825: socket; 9: signal line; 10: first seal ring; 20: first seal; 30: No. Second seal; 40: Second seal ring; 50: Third seal; 100: First pipe connector; 110: Third stepped part; 120: First mounting part; 200: Second pipe connector; 210: The fourth step portion; 220: second mounting portion; 300: electric plug; 400: conductive connector; 500: ground connector.

detailed description

The technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

The electromagnetic flowmeter of the present invention and the plant protection drone with the electromagnetic flowmeter will be described in detail below with reference to the drawings. The features in the following examples and implementations can be combined with each other without conflict.

With reference to FIGS. 1 to 4, an embodiment of the present invention provides an electromagnetic flowmeter. The electromagnetic flowmeter 4000 may include a bracket 1, a pipe 2, an electrode 3, a signal acquisition board 4 and a coil assembly 5. Wherein, the pipe 2 is provided on the bracket 1, and the two open ends of the pipe 2 are exposed outside the bracket 1. The pipeline 2 in this embodiment is used for liquid (for example, when the electromagnetic flowmeter 4000 is applied to a plant protection drone, the liquid may be water or liquid pesticide), optionally, the pipeline 2 in this embodiment is a straight pipeline 2. The two open ends of the pipe 2 are exposed from the two opposite side walls of the bracket 1 respectively. Optionally, the material of the pipe 2 is the same as the material of the bracket 1, and the pipe 2 and the bracket 1 are integrally formed.

The electrode 3 in this embodiment includes two electrodes. The two electrodes 3 are oppositely arranged on both sides of the bracket 1. After the detection ends of the two electrodes 3 pass through the side walls of the bracket 1 and the pipe 2 respectively, The liquid is in contact, and the detection ends of the two electrodes 3 are arranged oppositely.

Further, the signal collection board 4 also includes two. The two signal collection boards 4 and the two electrodes 3 are correspondingly disposed on the same side of the bracket 1. The signal collection board 4 is used to collect signals of the corresponding side electrodes 3. In this embodiment, the signal acquisition board 4 on each side collects the signal of the electrode 3 on the corresponding side, thereby reducing signal interference. After collecting the signal of the corresponding electrode 3, the signal collecting board 4 of this embodiment can amplify and filter the collected signal, thereby reducing the noise of the signal. For example, the signal collecting board 4 is provided with a differential circuit and the signal collecting board 4 The collected signal of the electrode 3 will remove common mode noise through the differential circuit.

Furthermore, the coil assembly 5 of this embodiment also includes two coil assemblies 5, which are disposed on the other two sides of the bracket 1 oppositely. In this embodiment, the two coil assemblies 5 are used to generate an electromagnetic field, which is an alternating magnetic field. The electromagnetic field generated by the two coil assemblies 5 can pass through the pipe 2 and enter the pipe 2. When the flow velocity of the liquid flowing through the pipe 2 changes, under the action of the electromagnetic field, the difference between the induced electromotive forces of the two electrodes 3 will also change accordingly.

The structural layout of the support 1, the electrode 3, the signal acquisition board 4 and the coil assembly 5 of the embodiment of the present invention increases the compactness between the structures, thereby reducing the volume of the electromagnetic flowmeter 4000 and reducing the weight of the electromagnetic flowmeter 4000 .

In some embodiments, the electromagnetic flowmeter 4000 further includes a control board 6, which is electrically coupled to the two signal acquisition boards 4, and the control board 6 can be based on the signals collected by the two signal acquisition boards 4. Obtain the flow rate and/or velocity of the liquid flowing through the pipe 2. Optionally, the control board 6 is integrated with one of the signal acquisition boards 4 on the same circuit board. The integrated arrangement of one of the signal acquisition boards 4 and the control board 6 in the embodiment of the present invention further increases the compactness of the structure. Thereby, the volume of the electromagnetic flowmeter 4000 is reduced, and the weight of the electromagnetic flowmeter 4000 is reduced. Optionally, the control board 6 and one of the signal acquisition boards 4 are provided on the same side of the bracket 1, and the control board 6 and the signal acquisition board 4 on the same side are connected through fixed connections (such as screw or bolt threaded fasteners) The fixed connection forms an integral structure to increase the compactness of the structure, thereby reducing the volume of the electromagnetic flowmeter 4000.

In other embodiments, the function of the control board 6 is integrated on one of the signal acquisition boards 4 and the two signal acquisition boards 4 are electrically coupled and connected. In this embodiment, the signal acquisition board 4 integrated with the function of the control board 6 is used to The signals collected by the two signal acquisition boards 4 acquire the flow rate and/or velocity of the liquid flowing through the pipeline 2.

The calculation formula of the flow rate Q of the liquid flowing through the pipeline 2 is as follows:

In formula (1), B is the magnetic field strength; U is the induced electromotive force generated by the two electrodes 3; A is the cross-sectional area of the pipe 2; d is the diameter of the pipe 2; k is the correction factor, and the liquid in the pipe 2 can be considered In fact, the rate is not uniform and other factors to set the size of k, so as to reduce the error between the flow rate Q of the liquid flowing through the pipeline 2 calculated by formula (1) and the actual flow rate of the liquid flowing through the pipeline 2 .

Optionally, k is about 0.8, for example, k may be 0.8±0.05. For an electromagnetic flowmeter 4000 of a specific size and for a specific working condition, the volume method (the volume of liquid flowing through the pipeline 2 within a certain period of time) can be used to calibrate the size of k.

After calculating the flow rate Q of the liquid flowing through the pipe 2 according to formula (1), the rate of the liquid flowing through the pipe 2 can be calculated according to the flow Q of the liquid flowing through the pipe 2.

Optionally, the bracket 1 is made of plastic material, which is convenient for magnetic field penetration, and can reduce the weight of the electromagnetic flowmeter 4000. Of course, the material of the bracket 1 is not limited to plastic, and other materials that are lighter in texture and easy to penetrate magnetic fields can be selected. Optionally, the bracket 1 may have a square shape such as a cube or a rectangular parallelepiped, or other regular shapes. Specifically, the shape of the bracket 1 may be designed according to needs.

The following embodiments further illustrate the structure of the electromagnetic flowmeter 4000 by taking the bracket 1 as a square as an example.

In this embodiment, the bracket 1 may include a first side wall and a second side wall disposed oppositely, wherein one electrode 3 is provided on one side of the first side wall, and the other electrode 3 is provided on one side of the second side wall. The first side wall and the second side wall are provided with electrode mounting holes 11 respectively, and the side wall of the pipe 2 is provided with a through hole corresponding to the position of the electrode mounting hole 11, and the electrode mounting hole 11 communicates with the corresponding through hole. After the detection end of one of the electrodes 3 passes through the electrode mounting hole 11 of the first side wall and the corresponding through hole, at least part of it is exposed in the pipe 2. After the detection end of the other electrode 3 passes through the electrode mounting hole 11 of the second side wall and the corresponding through hole, it is at least partially exposed in the pipe 2.

If the electrode 3 and the electrode mounting hole 11 are not tightly sealed, the liquid in the pipe 2 will leak through the electrode mounting hole 11 and enter the signal acquisition board 4, which may cause the signal acquisition board 4 to short-circuit. Therefore, in order to prevent liquid leakage in the pipe 2, in some embodiments, the outer side wall of the detection end of the electrode 3 abuts the side wall of the through hole. In other embodiments, the outer side wall of the detection end of the electrode 3 is not in abutting connection with the side wall of the through hole, but a sealing ring is provided between the detection end of the electrode 3 and the side wall of the through hole. It is a rubber sealing ring, and it can also be a sealing ring made of other materials.

Optionally, referring to FIGS. 5 and 6, the detection end of the electrode 3 is provided with a first stepped portion 33, and the side wall of the through hole is correspondingly provided with a second stepped portion (not shown), the first stepped portion 33 and the second The stepped portion abuts and fits, and the electrode 3 is limited by the second stepped portion to prevent the electrode 3 from being excessively installed.

In some embodiments, referring to FIG. 4, the electromagnetic flowmeter 4000 is further provided with a first sealing ring 10 which is sleeved on the electrode 3, and the first sealing ring 10 is used to seal the electrode 3 with The gap between the side walls of the electrode mounting hole 11 further prevents the liquid in the pipe 2 from leaking. Specifically, a first sealing ring 10 is provided between each electrode 3 and the side wall of the corresponding electrode mounting hole 11. The first sealing ring 10 may be a rubber sealing ring or a sealing ring made of other materials. The embodiment of the present invention does not specifically limit the material of the first sealing ring 10.

Further, referring to FIGS. 4 to 6, the side wall of the electrode 3 is provided with a boss 32, the side wall of the electrode mounting hole 11 is provided with a stepped surface, the boss 32 is in abutting connection with the stepped surface, and the first seal ring 10 is provided at The side of the boss 32 away from the detection end of the electrode 3 is designed with such a structure to prevent liquid from leaking from the electrode mounting hole 11.

Optionally, the electrode 3 includes a plurality of cylinders with different diameters. As shown in FIG. 6, the diameter of the portion between the detection end surface and the first step portion 33 on the electrode 3 is less than the diameter of the electrode 3 on the end surface of the first step portion 33 The diameter between the end surface of the boss 32 and the diameter of the portion between the end surface of the boss 32 and the trailing end surface of the electrode 3 on the electrode 3. Wherein, the tail end of the electrode 3 and the detection end of the electrode 3 are located at both ends of the electrode 3 respectively.

In this embodiment, the electrode 3 can be taken out of the electrode mounting hole 11 to facilitate maintenance and replacement of the electrode 3.

In order to make the two electrodes 3 better generate the induced electromotive force, in some embodiments, the two electrodes 3 are arranged coaxially, that is, the detection ends of the two electrodes 3 are directly opposite. Further, the two coil assemblies 5 are also coaxially arranged. Optionally, the axial direction of the electrode 3 is perpendicular to the axial direction of the coil assembly 5.

In addition, in order to position the electrode 3 in the bracket 1 and prevent the electrode 3 from falling from the electrode mounting hole 11, optionally, in combination with FIG. 1, FIG. 2, FIG. 4, FIG. 5, and FIG. 7, the electromagnetic flowmeter 4000 may further include The electrode fixing plate 7 includes two electrode fixing plates 7 in this embodiment. The two electrode fixing plates 7 are used to respectively fix the two electrodes 3 on the corresponding side walls of the bracket 1.

Specifically, the electrode fixing plate 7 is in contact with the electrode 3, and the electrode fixing plate 7 is installed on the side wall of the bracket 1 through a quick-release connection, thereby positioning the electrode 3 in the bracket 1. In this embodiment, the electrode fixing plate 7 cooperates with the quick release connector to position the electrode 3 in the bracket 1 to prevent the electrode 3 from falling; and, the quick fix piece is used to install the electrode fixing plate 7 on the bracket 1 and the electrode 3 When it needs to be replaced or repaired, the quick-release connector can be directly detached from the bracket 1, so that the electrode 3 can be quickly taken out, and the operation is convenient and quick.

The type of the quick release connector can be selected according to needs. The quick release connector in this embodiment may include at least one of the following: threaded fasteners and snaps. Among them, the threaded fasteners may be screws or bolts. It can be understood that the type of the quick release connector is not limited to this, and may be other quick release structures.

Referring again to FIG. 7, the electrode fixing plate 7 of this embodiment further includes a positioning hole 72. A first positioning portion is provided at a corresponding position of the bracket 1, and the quick-release member passes through the setting hole 72 and is fixed on the first positioning portion. Optionally, the positioning holes 72 include a plurality, for example, the positioning holes 72 include two, and the two positioning holes 72 are provided on both sides of the first through hole 71, so as to more firmly fix the electrode fixing plate 7 on the bracket 1 . Optionally, referring to FIG. 2, the side wall of the bracket 1 is provided with an accommodating groove 12, the electrode fixing plate 7 is installed in the accommodating groove 12, and the electrode fixing plate 7 is more firmly installed on the bracket 1.

The electrode fixing plate 7 may be made of plastic or other lighter materials to reduce the weight of the electromagnetic flowmeter 4000.

In some embodiments, referring to FIG. 7, the electrode fixing plate 7 is provided with a first through hole 71, the electrode fixing plate 7 is sleeved on the tail end of the electrode 3 through the first through hole 71, and the electrode fixing plate is sleeved and matched 7 The electrode 3 can be positioned more firmly in the bracket 1 to prevent the electrode 3 from shaking. Optionally, a sleeve portion (not shown) is provided on the end face of the electrode 3, and the electrode fixing plate 7 is sleeved on the sleeve portion through the first through hole 71. Further considering the compactness of the structural layout, optionally, the electrode fixing plate 7 is sandwiched between the electrode 3 and the signal acquisition plate 4 on the corresponding side.

As a feasible implementation manner, the signal acquisition board 4 and the electrode 3 on the corresponding side may be electrically coupled by direct contact. For example, the signal acquisition board 4 is provided with a first electrical connection portion, and the electrode 3 is provided with a first The electrical mating part, the first electrical connecting part and the first electrical mating part are connected in a plug-in or docking manner to realize the electrical coupling connection between the signal acquisition board 4 and the electrode 3 on the corresponding side.

As another feasible implementation manner, an indirect connection can be used to realize electrical coupling between the signal acquisition board 4 and the electrode 3 on the corresponding side. Optionally, in conjunction with FIG. 1 and FIG. 6, the end of the electrode 3 is provided with an electrical connection. The connection hole 31 and the signal acquisition board 4 are provided with conductive holes 41. The electromagnetic flowmeter 4000 may further include conductive connectors 400, wherein the conductive connectors 400 include two. The two conductive connectors 400 respectively cooperate with the conductive holes 41 of the signal acquisition board 4 on the corresponding side and the electrical connection holes 31 of the electrodes 3. Specifically, the conductive connector 400 passes through the conductive holes 41 and is fixedly connected to the electrical connection holes 31. The electrode 3 and the signal acquisition board 4 on the corresponding side are electrically coupled. In this embodiment, the signal collection board 4 and the electrode 3 are fixedly connected by the conductive connection member 400 to ensure the stability of the electrical coupling connection between the signal collection board 4 and the electrode 3. Optionally, the conductive connector 400 is a threaded fastener, such as a conductive screw or a conductive bolt. Optionally, the electrical connection holes 31 and the conductive holes 41 are respectively provided with electrical contact terminals, and both ends of the conductive connection member 400 are in electrical contact with the electrical contact terminals of the electrical connection holes 31 and the electrical contact terminals in the conductive holes 41, respectively.

Optionally, the signal acquisition board 4 is fixed on the bracket 1 by fasteners, and the fasteners may be screws, bolts, or other quick-release parts.

The bracket 1 of this embodiment may further include a third side wall and a fourth side wall disposed oppositely, wherein one coil component 5 is provided on one side of the third side wall, and the other coil component 5 is provided on a side of the fourth side wall side. The arrangement direction of the first side wall and the second side wall is perpendicular to the arrangement direction of the third side wall and the fourth side wall. The arrangement of the electrode 3 and the coil assembly 5 of this embodiment is adopted to make the electromagnetic flowmeter The structure of 4000 is more compact, thereby reducing the volume of electromagnetic flowmeter 4000.

1, 2 and 4, the coil assembly 5 may include a spiral coil 51 and a coil fixing plate 52, the spiral coil 51 includes an iron core 511 and a coil 512 wound on the iron core 511, the coil fixing plate 52 and the bracket 1 The corresponding side walls of the are fixedly connected, and the corresponding side walls of the coil fixing plate 52 and the bracket 1 surround to form a receiving space, and the iron core 511 and the coil 512 are contained in the receiving space, so that the electromagnetic field is sealed in the bracket 1 by the coil fixing plate 52 . Optionally, the coil fixing plate 52 is a metal plate such as an iron plate or a steel plate. The metal plate can block the electromagnetic field generated by the coil assembly 5 and seal the electromagnetic field in the bracket 1.

In this embodiment, the bracket 1 may further include a fifth side wall and a sixth side wall disposed oppositely, one of the open ends of the pipe 2 extends from the fifth side wall, and the other open end of the pipe 2 extends from the sixth side wall Reach out. In this embodiment, the arrangement direction of the first side wall and the second side wall, the arrangement direction of the third side wall and the fourth side wall, and the arrangement direction of the fifth side wall and the sixth side wall are respectively perpendicular.

Optionally, the pipeline 2 is a pipeline 2, the axis of the spiral coil 51 is arranged substantially perpendicular to the extending direction of the pipeline 2, and the structure layout of the electromagnetic flowmeter 4000 is more compact.

1 to FIG. 3, the electromagnetic flowmeter 4000 further includes a housing 8, the housing 8 has a housing space, the bracket 1 is installed in the housing space. Optionally, the housing 8 includes a housing 81 and a cover plate 82, an opening is provided on one side of the housing 81, the cover plate 82 is used to cover the opening, the holder 1, the electrode 3, the signal acquisition board 4, the coil assembly 5 and the control The plates 6 are all provided in the casing 81.

In some embodiments, the cover 82 is fixedly connected to the bracket 1. Optionally, a second positioning portion 821 is provided on the cover plate 82, and a positioning and matching portion 13 is provided on the bracket 1. The second positioning portion 821 is connected to the positioning and matching portion 13, so that the cover plate 82 is fixedly connected to the bracket 1. The second positioning portion 821 and the positioning and matching portion 13 can be mated by plug-in connection or other methods.

In addition, the materials of the housing 81 and the cover plate 82 can be selected according to needs. Optionally, the cover plate 82 and/or the housing 81 are aluminum structures, such as aluminum alloy. Further, the outer surface of the cover plate 82 and/or the casing 81 can be coated with laser engraving technology to prevent corrosion of the cover plate 82 and/or the casing 81.

In some embodiments, the cover plate 82 is in conductive contact with the housing 81. Optionally, the cover plate 82 is in direct contact with the housing 81 to achieve electrical contact. Further, referring to FIGS. 8 to 11, the signal acquisition board 4 and/or the control board 6 are provided with a ground jack 61. The electromagnetic flowmeter 4000 of this embodiment may further include a ground connection 500, and the ground connection 500 passes through the ground The socket 61 is fixed on the inner side wall of the housing 8, for example, the grounding connector 500 is fixed to the cover plate 82 through the ground socket 61, so that the cover plate 82 and the housing 81 are grounded. This embodiment realizes the grounding of the housing 8 through the cooperation of the ground jack 61 and the ground connector 500. The housing 8 can play the role of electromagnetic shielding. In this embodiment, without adding an additional electromagnetic shielding cover, the housing 8 is grounded. Grounding can avoid the signal acquisition board 4, control board 6, etc. from being interfered by external signals. The way in which the housing 8 is grounded to achieve electromagnetic shielding does not increase the volume and weight of the electromagnetic flowmeter, and the electromagnetic flowmeter has a wide range of applications.

Optionally, the ground connection 500 is a threaded fastener, such as a screw or bolt.

As a feasible implementation manner, the ground jack 61 is provided on the signal acquisition board 4, optionally, one of the signal acquisition boards 4 is adjacent to the cover board 82, and the ground jack 61 is located adjacent to the cover board 82 On the signal acquisition board 4 provided, it is convenient for the ground connection 500 to connect the ground jack 61 and the housing 8.

As another feasible implementation manner, the ground jack 61 is provided on the control board 6. Optionally, the control board 6 is provided adjacent to the cover plate 82 to facilitate the ground connector 500 to connect the ground jack 61 and the housing 8.

Optionally, referring to FIGS. 9 to 11 and FIG. 15, the side wall of the cover plate 82 facing the opening is provided with a ground protrusion 822. The ground connector 500 passes through the ground jack 61 and is detachably connected to the ground protrusion 822 by The ground connector 500 detachably connects the control board 6 and the ground protrusion 822. When the signal acquisition board 4 or the control board 6 needs to be repaired, the ground connector 500 can be directly removed from the ground protrusion 822, which is convenient and quick .

In addition, if the connection between the housing 81 and the cover 82 is not well sealed, water (mainly moisture in the air) may flow into the housing 81 from the gap between the opening edge of the housing 81 and the cover 82 The signal acquisition board 4 and the control board 6 in the housing 81 may be short-circuited when encountering water, and other components in the housing 81 may be damaged due to water, thereby causing damage to the electromagnetic flowmeter 4000. In this regard, referring to FIGS. 12 and 13, the connection between the housing 81 and the cover plate 82 is provided with a first seal 20, which is used to prevent water (mainly moisture in the air) from the housing 81. The gap between the peripheral edge of the opening and the cover plate 82 flows into the housing 81. The first sealing member 20 may be a rubber sealing member or a sealing member of other materials. The embodiment of the present invention does not specifically limit the material of the first sealing member 20.

Optionally, one of the open ends of the pipe 2 protrudes from the side wall of the housing 81 opposite the opening, and the other open end of the pipe 2 protrudes from the cover plate 82. It can be understood that the two open ends of the pipe 2 can also protrude from other positions of the housing 8.

1 to 3 and 8 to 12, the electromagnetic flowmeter 4000 of this embodiment may further include a first pipe connector 100 and a second pipe connector 200, one of the first pipe connector 100 and the pipe 2 The open end is connected, and the second pipe connector 200 is connected to the other open end of the pipe 2. The first pipe connector 100 and the second pipe connector 200 can be connected to an external structure, so as to realize the connection between the electromagnetic flowmeter 4000 and the external structure.

In the existing electromagnetic flowmeter, the liquid flowing through the pipeline may have different potentials at different positions of the pipeline, and the potential reference referred to when the two electrodes are detected may be inconsistent, resulting in low measurement accuracy. For this, in this embodiment, the first pipe connector 100 and the cover plate 82 are fixedly connected, and the first pipe joint 100 and the cover plate 82 are electrically connected to ground. Further, the second pipe connector 200 is fixedly connected to the casing 81, and the second pipe joint 200 and the casing 81 are electrically connected to ground. The grounding of the first pipe connector 100 and the second pipe connector 200 makes the liquid potential in the pipe 2 zero, and both electrodes 3 detect the electromotive force based on the zero potential of the liquid, thereby improving the detection accuracy. In addition, if the first pipe connector 100 and the second pipe connector 200 are only connected to the open end of the pipe 2, it is easy to fall off. In this embodiment, the first pipe connector 100 is fixed to the cover 82 to connect the second pipe The head 200 is fixed on the casing 81, which can prevent the first pipe connector 100 and the second pipe connector 200 from falling off and improve the stability of the electromagnetic flowmeter 4000.

The fixed connection between the first pipe connector 100 and the cover plate 82 can be designed as required. For example, in one embodiment, referring to FIGS. 12 and 13, the cover plate 82 is provided with a first mounting boss 823, A mounting boss 823 is provided with a second through hole, the second through hole communicates with one of the open ends of the pipe 2, and the first pipe connector 100 is sleeved on the first mounting boss 823. In this embodiment, since the first mounting boss 823 is provided on the cover plate 82, the first mounting boss 823 is also grounded. The first pipe connector 100 is sleeved on the first mounting boss 823 to realize electrical conduction between the first pipe connector 100 and the first mounting boss 823, thereby achieving grounding of the first pipe connector 100. In addition, the first pipe connector 100 is sleeved on the first mounting boss 823, and the first pipe connector 100 can be stably fixed on the cover plate 82. Optionally, the first mounting boss 823 has a circular ring shape.

Optionally, a third step portion 110 is provided on the inner side wall of the first pipe connector 100, and the third step portion 110 abuts the end surface of the top end of the first mounting boss 823 to ensure that the first pipe connector 100 and the first The mounting boss 823 can be installed in place. Further, a second seal 30 is provided between the third step portion 110 and the end surface of the first mounting boss 823 away from the open end of the pipe 2, the second seal 30 is used to prevent water in the pipe 2 from the first pipe The gap between the connector 100 and the first mounting boss 823 flows into the housing 81, thereby preventing the signal acquisition board 4, the control board 6 and the like in the housing 81 from being short-circuited with water, and avoiding the other in the housing 81 Parts are damaged due to water. The second sealing member 30 may be a rubber sealing member or a sealing member of other materials. The embodiment of the present invention does not specifically limit the material of the second sealing member 30.

Optionally, the cover plate 82 is provided with a plurality of first mounting holes 824, and the first pipe connector 100 includes a first mounting portion 120, and the first mounting portion 120 is respectively fixed to the plurality of first mounting holes 824 by threaded fasteners The connection realizes a stable connection between the first pipe connector 100 and the cover 82. The plurality of first mounting holes 824 are spaced apart, so that the first pipe 2 can be fixed to the cover 82 more stably from different directions. Among them, the threaded fasteners may be screws or bolts.

The fixed connection between the second pipe connector 200 and the housing 81 can also be designed as required. For example, in an embodiment, referring to FIGS. 12 and 14, the housing 81 is provided with a second mounting boss 811, The second mounting boss 811 is provided with a third through hole, and the second pipe connector 200 is sleeved on the second mounting boss 811. In this embodiment, since the second mounting boss 811 is provided on the housing 81, the second mounting boss 811 is also grounded. The second pipe connector 200 is sleeved on the second mounting boss 811 to realize electrical conduction between the second pipe connector 200 and the second mounting boss 811, thereby achieving grounding of the second pipe connector 200. In addition, the second pipe connector 200 is sleeved on the second mounting boss 811, and the second pipe connector 200 can be stably fixed on the housing 81. Optionally, the second mounting boss 811 has a circular ring shape.

Optionally, a second sealing ring 40 is provided between the inner side wall of the second pipe connector 200 and the outer side wall of the second mounting boss 811, and the second sealing ring 40 is used to prevent water from passing outside the housing 81 The gap between the first pipe connector 100 and the second mounting boss 811 flows into the housing 81, thereby preventing the signal acquisition board 4, control board 6 and the like in the housing 81 from being short-circuited with water, and avoiding the housing 81 The other parts inside are damaged by water. Optionally, referring to FIG. 14, the outer wall of the second mounting boss 811 is provided with a mounting groove 8111, and the second sealing ring 40 is accommodated in the mounting groove 8111. The second sealing ring 40 may be a rubber sealing ring or a sealing ring made of other materials. The embodiment of the present invention does not specifically limit the material of the second sealing ring 40.

Optionally, the inner wall of the second pipe connector 200 is provided with a fourth stepped portion 210, and the fourth stepped portion 210 is in contact with the end surface of the top end of the second mounting boss 811 to ensure that the second pipe connector 200 and the second The mounting boss 811 can be installed in place. Further, a third seal 50 is provided between the fourth step portion 210 and the top end of the second mounting boss 811 to prevent water in the pipe 2 from passing between the second pipe connector 200 and the second mounting boss 811 The gap between them flows into the housing 81, thereby preventing the signal acquisition board 4, the control board 6 and the like in the housing 81 from being short-circuited with water, and preventing other components in the housing 81 from being damaged by water. The third sealing member 50 may be a rubber sealing member or a sealing member of other materials. The embodiment of the present invention does not specifically limit the material of the third sealing member 50.

Optionally, the housing 81 is provided with a plurality of second mounting holes 812, and the second pipe connector 200 includes a second mounting portion 220; the second mounting portion 220 is respectively fixed to the plurality of second mounting holes 812 by threaded fasteners The connection realizes a stable connection between the second pipe connector 200 and the housing 81. The plurality of second mounting holes 812 are spaced apart, so that the second pipe connector 200 can be more stably fixed to the housing 81 from different directions. Among them, the threaded fasteners may be screws or bolts.

In addition, the first pipe connector 100 and the second pipe connector 200 in this embodiment may be made of stainless steel, which is not easy to be oxidized, thereby preventing the first pipe connector 100 and the second pipe connector 200 from oxidizing and conducting electricity. If the first pipe connector 100 and the second pipe connector 200 are electrically conductive, the detection reference of the two electrodes 3 is not 0 potential, and with time, the detection reference of the two electrodes 3 may also change, resulting in electromagnetic The detection accuracy of the flow meter 4000 decreases. Of course, the first pipe connector 100 and the second pipe connector 200 can also be made of other materials that are not easily oxidized.

Optionally, the parts where the first pipe connector 100 and the second pipe connector 200 are in contact with the cover plate 82 and the housing 81 are passivated to prevent the oxidation of the first pipe connector 100 and the second pipe connector 200 Conductive.

1 to FIG. 3, FIG. 8 to FIG. 11 and FIG. 15, the electromagnetic flowmeter 4000 of this embodiment further includes an electric plug 300, which is used to connect an external power source, so that the electromagnetic flowmeter 4000 is powered on. Optionally, referring to FIGS. 1 and 15, the control board 6 is provided with a second electrical connection portion 62, the cover plate 82 is provided with a plug interface 825, the second electrical connection portion 62 is accommodated in the plug interface 825, and the electric plug 300 is connected to The second electrical connection portion 62 is mated in the socket 825.

Since the two electrodes 3 must be located on both sides of the electromagnetic field, and the signals of the two electrodes 3 need to be amplified and/or noise-reduced corresponding to the signal acquisition board 4 on the side, the signals collected by the two signal acquisition boards 4 need to be finally aggregated to the control Only board 6 can be processed. Since the two signal acquisition boards 4 are also relatively arranged on both sides of the bracket 1, one of the signal acquisition boards 4 needs to be connected to the control board 6 through the signal line 9, due to structural limitations, the signal line 9 will pass through the electromagnetic field, which is It will cause a closed conductor loop in the electromagnetic field. And because the electromagnetic field in the electromagnetic flowmeter is an alternating magnetic field, if the plane formed by the conductor loop is not parallel to the direction of the magnetic field, it will be affected by the changing magnetic field to generate an induced electromotive force and interfere with the measurement signal. This interference is called Differential interference. The existence of differential interference will affect the stability of the flow rate signal and reduce the measurement accuracy. For a long time, the industry lacked effective solutions. Relying on manual adjustments and software evasion methods cannot solve this problem very well.

At present, most electromagnetic flowmeters are designed to fine-tune the mechanical structure of the signal line. After the electromagnetic flowmeter is assembled, manually observe the differential interference signal and manually fine-tune the mechanical structure to reduce the interference signal. This method is inefficient and difficult to accurately assess the adjustment effect, which is not suitable for large-scale use of mass-produced products.

Manual fine-tuning can only be used in the manufacture of small batches of customized flowmeters. This solution cannot be mass-produced, cannot guarantee product consistency, and cannot measure the effectiveness of adjustments with objective indicators; software circumvention methods set accurate sampling times To avoid interference signal time, this method will shorten the effective signal sampling time. For high-frequency excitation scenarios, if the interference cannot be effectively suppressed, the upper limit of the excitation frequency will be limited, especially for the small-scale electromagnetic flowmeter, the signal is weak If the interference is too large, it will seriously affect the signal measurement.

For this, the embodiments of the present invention reduce the projected area of the conductor loop formed by the signal line in the direction of the electromagnetic field by adjusting the direction of the signal line, and suppress the differential interference within a reasonable range to reduce the degree of interference and effectively control the individual The difference between them ensures that the assembled flow meter has a small difference.

With reference to FIGS. 1 and 9 to 11, the electromagnetic flowmeter 4000 may further include a signal line 9. Both ends of the signal line 9 are electrically connected to two signal acquisition boards 4 (one of which is also a control board 6 ). Coupling connection, the two helical coils 51 of this embodiment are arranged coaxially, the arrangement direction of the signal line 9 intersects the axes of the two helical coils 51, and the signal line 9 is arranged around the end of one of the coil assemblies 5 . The signal line 9 and the two signal acquisition boards 4 form a “gate”-like structure.

It should be noted that, in the embodiment of the present invention, the arrangement direction of the signal wires 9 refers to the extending direction of the two connecting ends of the signal wires 9 used to connect the two signal acquisition boards 4.

In the embodiment of the present invention, the structural limit between the signal line 9 and the two signal acquisition boards 4 is rationally designed to minimize the projection area of the conductor loop formed by the signal line 9 in the direction of the electromagnetic field, which can eliminate differential interference on the signal The effect of the electromagnetic flowmeter 4000 improves the measurement accuracy of the electromagnetic flowmeter 4000, and effectively controls the differences between the individuals, ensuring that the difference in the assembled flowmeter is small, so that the electromagnetic flowmeter 4000 has better signal consistency.

Optionally, the pipeline 2 is a straight pipeline 2, and the signal line 9 is arranged substantially perpendicular to the extending direction of the pipeline 2. Since the axis of the spiral coil 51 is perpendicular to the extending direction of the pipe 2, the central axis of the signal line 9 and the axis of the spiral coil 51 are also perpendicular to each other, and the projection of the conductor loop formed by the signal line 9 in the direction of the electromagnetic field is a point, so This structural design method can minimize the projection area of the conductor loop formed by the signal line 9 in the direction of the electromagnetic field, thereby maximally eliminating the effect of differential interference on the signal and improving the measurement accuracy of the electromagnetic flowmeter 4000. It can be understood that the extending direction of the signal line 9 and the pipeline 2 is substantially perpendicular means that the angle between the signal line 9 and the extending direction of the pipeline 2 is 90°± an error value, that is, within the allowable error range, the signal line 9 can be considered It is substantially perpendicular to the extending direction of the pipe 2.

Optionally, the two electrodes 3 are arranged coaxially, and the central axis of the signal line 9 is arranged coplanar with the central axis of the electrode 3. Since the axis of the spiral coil 51 is perpendicular to the central axis of the electrode 3, the central axis of the signal line 9 and the axis of the spiral coil 51 are also perpendicular to each other, and the projection of the conductor loop formed by the signal line 9 in the direction of the electromagnetic field is a point, so This structural design method can minimize the projection area of the conductor loop formed by the signal line 9 in the direction of the electromagnetic field, thereby maximally eliminating the effect of differential interference on the signal and improving the measurement accuracy of the electromagnetic flowmeter 4000.

Optionally, the signal line 9 has a preset width and a preset length, and the width direction of the signal line 9 is parallel to the extending direction of the pipe 2. This layout method can also make the central axis of the signal line 9 and the axis of the spiral coil 51 perpendicular to each other , And to the greatest extent eliminate the effect of differential interference on the signal, improve the measurement accuracy of the electromagnetic flowmeter 4000. It should be noted that in the embodiment of the present invention, the width of the signal line 9 refers to the width of the signal line 9 perpendicular to the arrangement direction of the signal line 9. The preset width can be determined according to the number of signal paths between the two signal acquisition boards 4.

The shape of the signal line 9 can be designed according to needs, in order to increase the compactness of the structure to reduce the volume of the electromagnetic flowmeter 4000, optionally, the signal line 9 is a sheet structure, and the signal line 9 is substantially parallel to the support 1 The sidewall is set.

In addition, in some embodiments, the bracket 1 is square, and the signal wires 9 are arranged along the symmetry axis of the side wall of the bracket 1 to ensure that the arrangement direction of the signal wires 9 intersects the axes of the two helical coils 51 as much as possible. It is possible to eliminate the effect of differential interference on the signal.

With reference to FIGS. 9 to 11, the signal line 9 of this embodiment may be provided on one side of the third side wall or the fourth side wall, as far as possible to ensure that the arrangement direction of the signal line 9 intersects the axes of the two spiral coils 51. Optionally, the middle of the signal line 9 is substantially parallel to the surface of the third side wall or the fourth side wall to ensure that the axis of the signal line 9 and the spiral coil 51 are perpendicular to eliminate the effect of differential interference on the signal as much as possible and improve the electromagnetic The measurement accuracy of the flowmeter 4000. It can be understood that the middle of the signal line 9 is substantially parallel to the surface of the third side wall or the fourth side wall means that the middle of the signal line 9 is completely parallel to the surface of the third side wall or the fourth side wall, or the The middle portion is approximately parallel to the surface of the third side wall or the fourth side wall.

In some embodiments, there is a gap between the signal line 9 and the third side wall or the fourth side wall, increasing the distance between the signal line 9 and the coil assembly 5 within the third side wall or the fourth side wall, thereby Reduce the interference of the signal line 9 to the electromagnetic field when transmitting signals. Further, a spacer is provided between the coil fixing plate 52 and the signal line 9, and the spacer is used to make a gap between the signal line 9 and the coil fixing plate 52 to ensure the signal line 9 and the third side wall or the fourth side wall The spacing between the inner coil assemblies 5 is stable. The spacer can be made of hard material or flexible material. Optionally, the spacer is made of a material that can be deformed to prevent the signal line 9 from being worn and extend the service life of the signal line 9. The spacer can be foam or rubber, or other flexible parts.

The implementation method of connecting the signal line 9 to the two signal acquisition boards 4 can be selected according to needs. For example, in some embodiments, the two ends of the signal line 9 are detachably connected to the corresponding signal acquisition boards 4 through electrical connectors, respectively. The two signal acquisition boards 4 are electrically coupled.

In other embodiments, one end of the signal line 9 is integrally formed with one of the signal acquisition boards 4, and the other end of the signal line 9 is provided with an electrical connector, which is detachable from the electrical connector of the other signal acquisition board 4 Connection, the signal line 9 is not easy to lose, and this design will not cause trouble to the installation of the signal acquisition board 4 and reduce the weight of the electromagnetic flowmeter 4000. It can be understood that the electrical connector of the signal line 9 and the electrical connector of the signal acquisition board 4 are a male head and a female head that cooperate with each other, and the cooperation of the male head and the female head can realize the electrical connection between the signal line 9 and the signal acquisition board 4. Coupling connection.

Further optionally, the two ends of the signal line 9 are respectively connected to the center positions of the sides of the two signal acquisition boards 4 so as to ensure that the axes of the two spiral coils 51 pass through the signal line 9.

The signal line 9 in this embodiment may be an FPC line, and the FPC line is convenient to be bent, so that the signal acquisition boards 4 relatively disposed on both sides of the bracket 1 can be more conveniently connected. It can be understood that the signal line 9 may also be other types of wires.

It can be understood that, the layout manners of the signal lines 9 in the above embodiments may be combined with each other.

In addition, in an alternative embodiment, the two signal acquisition boards 4 are connected by a signal transmission circuit board to realize signal transmission. The two signal acquisition boards 4 and the signal transmission board form a similar "gate" shape structure, thereby eliminating differential interference pairs The influence of the signal improves the measurement accuracy of the electromagnetic flowmeter 4000.

It is worth mentioning that the electromagnetic flowmeter 4000 of the above embodiment can be applied to plant protection drones or other devices with liquid channels.

Referring to FIG. 16, an embodiment of the present invention further provides a plant protection drone, which may include a rack 1000, a spray assembly 2000 installed on the rack 1000, a medicine box 3000 installed on the rack 1000, and The electromagnetic flowmeter 4000 of the spraying flow in the above embodiment, wherein the electromagnetic flowmeter 4000 is used to detect the spraying assembly 2000 in real time, the structure and working principle of the electromagnetic flowmeter 4000 can be referred to the description of the above embodiment, and will not be repeated here.

In this embodiment, one of the open ends of the pipe 2 of the electromagnetic flowmeter 4000 communicates with the spraying assembly 2000 through a diversion tube, and the other open end of the pipe 2 communicates with the medicine box 3000 through a diversion tube. Specifically, one of the open ends of the pipe 2 is connected to the sprinkler assembly 2000 through the first pipe connector 100 to connect with the guide tube, and the other open end of the pipe 2 is connected to the guide pipe through the second pipe connector 200 to connect with the medicine box 3000 connectivity.

The electromagnetic flowmeter 4000 of this embodiment is small in size and light in weight. The application of the electromagnetic flowmeter 4000 to a plant protection drone will not affect the installation of other structures of the plant protection drone, and will not bring about a greater impact on the plant protection drone. The heavy load has improved the endurance of plant protection drones.

The rack 1000 may include a body 1100 and a tripod 1200 connected to both sides of the bottom of the body 1100. Further, the rack 1000 may further include arms 1300 connected to both sides of the fuselage 1100. The spray assembly 2000 of this embodiment includes at least a spray head. Optionally, the spray assembly 2000 is installed at an end of the arm 1300 away from the fuselage 1100. Optionally, the plant protection drone is a multi-rotor drone, including a propeller. The propeller is disposed at an end of the arm 1300 away from the fuselage 1100, and the spray assembly 2000 is located below the propeller. Optionally, the medicine box 3000 is installed at the bottom of the fuselage 1100, and is located between the two tripods 1200. Optionally, the electromagnetic flowmeter 4000 is provided at the water outlet of the medicine box 3000.

In this embodiment, after obtaining the spray flow of the spray assembly 2000, the control board 6 sends the spray flow to the flight controller of the plant protection drone, and the flight controller according to the spray flow sent by the control board 6 and the actual demanded spray The flow rate controls the water output of the medicine box 3000.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations There is any such actual relationship or order. The terms "include", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also others that are not explicitly listed Elements, or also include elements inherent to such processes, methods, objects, or equipment. Without more restrictions, the element defined by the sentence "include one..." does not exclude that there are other identical elements in the process, method, article or equipment that includes the element.

The electromagnetic flowmeter provided by the embodiment of the present invention and the plant protection drone with the electromagnetic flowmeter have been described in detail above. Specific examples are used in this article to explain the principle and implementation of the present invention. It is only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope, in summary, The contents of this description should not be construed as limiting the invention.

Claims

An electromagnetic flowmeter, characterized in that the electromagnetic flowmeter includes:

support;

A pipe, the pipe is provided on the bracket, and two open ends of the pipe are exposed outside the bracket;

Two electrodes, two of the electrodes are disposed on opposite sides of the bracket, and the detection ends of the two electrodes pass through the bracket and the side wall of the pipe, and can flow through the pipe The liquid is in contact, and the detection ends of the two electrodes are arranged oppositely;

Two signal acquisition boards, two of the signal acquisition boards and two of the electrodes are correspondingly disposed on the same side of the bracket, and the signal acquisition board is used to acquire signals of the corresponding side electrodes;

Two coil assemblies, the two coil assemblies are oppositely arranged on the other two sides of the bracket, and are used to generate an electromagnetic field; and

A control board, which is electrically coupled to the two signal acquisition boards, and used to obtain the flow rate and/or velocity of the liquid flowing through the pipeline according to the signals collected by the two signal acquisition boards;

Wherein, the control board is integrated with one of the signal acquisition boards on the same circuit board.
The electromagnetic flowmeter of claim 1, wherein the two electrodes are coaxially arranged, and the two coil assemblies are coaxially arranged.
The electromagnetic flowmeter according to claim 2, wherein the axial direction of the electrode is perpendicular to the axial direction of the coil assembly.
The electromagnetic flowmeter according to any one of claims 1 to 3, wherein the bracket includes a first side wall and a second side wall disposed oppositely, wherein one electrode is provided on one of the first side walls Side, another electrode is provided on one side of the second side wall;

The first side wall and the second side wall are respectively provided with electrode mounting holes, the pipe side wall is provided with a through hole corresponding to the position of the electrode mounting hole, and the electrode mounting hole communicates with the through hole ;

After the detection end of one electrode passes through the electrode mounting hole of the first side wall and the corresponding through hole, it is at least partially exposed in the pipe, and the detection end of the other electrode passes through the electrode of the second side wall After the installation hole and the corresponding through hole, at least part of it is exposed in the pipe.
The electromagnetic flowmeter according to claim 4, wherein the electromagnetic flowmeter is further provided with a first seal ring, the first seal ring is sleeved on the electrode, and is used to seal the electrode and the The gap between the side walls of the electrode mounting hole.
The electromagnetic flowmeter according to claim 5, wherein the sidewall of the electrode is provided with a boss, the sidewall of the electrode mounting hole is provided with a stepped surface, and the boss is in contact with the stepped surface connection;

The first sealing ring is disposed on a side of the boss away from the detection end of the electrode.
The electromagnetic flowmeter according to claim 4, wherein the electromagnetic flowmeter further comprises:

Two electrode fixing plates are respectively used to fix the two electrodes on the corresponding side walls of the bracket.
The electromagnetic flowmeter according to claim 7, wherein the electrode fixing plate is in contact with the electrode, and the electrode fixing plate is installed on the side wall of the bracket through a quick-release connection, so that The electrode is positioned within the bracket.
The electromagnetic flowmeter according to claim 8, wherein the electrode fixing plate is provided with a first through hole, and the electrode fixing plate is sleeved on the tail end of the electrode through the first through hole, and The electrode fixing plate is sandwiched between the electrode and the signal acquisition plate on the corresponding side;

Wherein, the tail end of the electrode and the detection end of the electrode are respectively located at both ends of the electrode.
The electromagnetic flowmeter according to claim 8, wherein an electrical connection hole is provided at the tail end of the electrode, and a conductive hole is provided at the signal acquisition board;

The electromagnetic flowmeter further includes two conductive connecting pieces, and the two conductive connecting pieces respectively cooperate with the conductive holes of the signal acquisition board on the corresponding side and the electrical connecting holes of the electrodes;

After the conductive connection piece passes through the conductive hole and is fixedly connected to the electrical connection hole, the electrode and the signal acquisition board on the corresponding side are electrically coupled and connected.
The electromagnetic flowmeter of claim 10, wherein the conductive connecting member is a threaded fastener, and the signal collecting board and the electrode are fixedly connected through the conductive connecting member.
The electromagnetic flowmeter according to claim 2, wherein the axis of the coil assembly is arranged substantially perpendicular to the extending direction of the pipe.
The electromagnetic flowmeter according to claim 1, wherein the bracket further comprises third and fourth side walls disposed oppositely, wherein one coil assembly is provided on one side of the third side wall, and the other A coil assembly is provided on one side of the fourth side wall.
The electromagnetic flowmeter according to claim 1, 12 or 13, wherein the coil assembly includes a spiral coil, the spiral coil includes an iron core and a coil wound on the iron core, the coil assembly Also includes coil fixing plate;

The coil fixing plate is fixedly connected to the corresponding side wall of the bracket, and the coil fixing plate and the corresponding side wall of the bracket surround to form an accommodation space, and the iron core and the coil are accommodated in the accommodation space Inside.
The electromagnetic flowmeter according to claim 14, wherein the coil fixing plate is a metal plate.
The electromagnetic flowmeter according to claim 1, wherein the bracket is made of plastic material.
The electromagnetic flowmeter according to claim 1, wherein the bracket further comprises oppositely arranged fifth side walls and sixth side walls, and one of the open ends of the pipe protrudes from the fifth side wall , The other open end of the pipe protrudes from the sixth side wall.
The electromagnetic flowmeter according to claim 1 or 17, wherein the electromagnetic flowmeter further comprises a housing and a cover plate, an opening is provided on one side of the housing, and the cover plate is used to cover the Narration

The bracket, the electrode, the signal acquisition board, the coil assembly and the control board are all provided in the housing;

One open end of the duct extends from a side wall of the housing opposite to the opening, and the other open end of the duct extends from the cover plate.
The electromagnetic flowmeter of claim 18, wherein the electromagnetic flowmeter further comprises a first pipe connection head and a second pipe connection head;

The first pipe connector is connected to one of the open ends of the pipe, and the second pipe connector is connected to the other open end of the pipe.
The electromagnetic flowmeter according to claim 19, wherein the cover plate and/or the housing are made of aluminum.
The electromagnetic flowmeter according to claim 20, wherein the outer surface of the cover plate and/or the housing is coated with laser engraving technology.
The electromagnetic flowmeter of claim 18, wherein a second positioning portion is provided on the cover plate, a positioning and matching portion is provided on the bracket, and the second positioning portion is connected to the positioning and matching portion So that the cover plate is fixedly connected to the bracket.
The electromagnetic flowmeter of claim 18, wherein the cover plate is in conductive contact with the housing;

The control board is provided with a ground jack, and the electromagnetic flowmeter further includes a ground connector, and the ground connector is fixed to the cover plate through the ground jack so that the cover plate and the shell The body is grounded.
The electromagnetic flowmeter of claim 23, wherein the control board is disposed adjacent to the cover board.
The electromagnetic flowmeter according to claim 24, wherein the side wall of the cover plate facing the opening is provided with a grounding protrusion, and the grounding connecting member passes through the grounding jack and is connected to the grounding protrusion Detachable connection.
The electromagnetic flowmeter of claim 23, wherein the ground connection is a threaded fastener.
The electromagnetic flowmeter of claim 23, wherein the electromagnetic flowmeter further comprises:

Electric plug

The control board is provided with a second electrical connection part, and the cover board is provided with a plug interface;

The second electrical connection portion is accommodated in the socket, and the electrical plug and the second electrical connection portion are mated in the socket.
The electromagnetic flowmeter of claim 1, wherein the electromagnetic flowmeter further comprises:

Signal line

Wherein, both ends of the signal line are electrically coupled to the two signal acquisition boards, the two coil assemblies are coaxially arranged, and the arrangement direction of the signal lines intersects the axes of the two coil assemblies , And the signal line is disposed around the end of one of the coil assemblies.
The electromagnetic flowmeter of claim 28, wherein the signal line is disposed substantially perpendicular to the extending direction of the pipe.
The electromagnetic flowmeter according to claim 28 or 29, wherein the two electrodes are coaxially arranged, and the central axis of the signal line is coplanar with the central axis of the electrode.
The electromagnetic flowmeter according to claim 28 or 29, wherein the signal line has a preset width and a preset length, and the width direction of the signal line is parallel to the extending direction of the pipe.
The electromagnetic flowmeter according to claim 28 or 29, wherein the bracket is square, and the signal lines are arranged along the symmetry axis of the side wall of the bracket.
The electromagnetic flowmeter according to claim 28 or 29, wherein one end of the signal line is integrally formed with one of the signal acquisition boards;

The other end is provided with an electrical connector for detachable connection with the electrical connector of another signal acquisition board.
The electromagnetic flowmeter according to claim 28 or 29, wherein the two ends of the signal line are respectively connected to the center positions of the sides of the two signal acquisition boards.
A plant protection drone, characterized in that the plant protection drone includes:

frame;

Spraying assembly, installed on the rack;

A medicine box, mounted on the rack; and

An electromagnetic flowmeter for real-time detection of the spray flow of the spray assembly, the electromagnetic flowmeter includes a bracket, a pipe, two electrodes, two signal acquisition boards, two coil assemblies, and a control board;

The duct is provided on the bracket, and two open ends of the duct are exposed outside the bracket, one of the open ends of the duct is communicated with the spraying assembly through a diversion tube, and the other open end is through a diversion The tube is in communication with the medicine box;

The two electrodes are oppositely arranged on both sides of the bracket. After the detection ends of the two electrodes pass through the bracket and the side wall of the pipe, they can contact with the liquid flowing through the pipe. And the detection ends of the two electrodes are oppositely arranged;

Two of the signal acquisition boards and two of the electrodes are correspondingly arranged on the same side of the bracket, and the signal acquisition board is used to collect signals of the electrodes on the corresponding side;

The two coil assemblies are oppositely arranged on the other two sides of the bracket, and are used to generate an electromagnetic field;

The control board is electrically coupled to the two signal acquisition boards, and is used to obtain the flow rate and/or velocity of the liquid flowing through the pipeline according to the signals collected by the two signal acquisition boards;

Wherein, the control board is integrated with one of the signal acquisition boards on the same circuit board.
The plant protection drone according to claim 35, wherein two of the electrodes are coaxially arranged, and two of the coil assemblies are coaxially arranged.
The plant protection drone according to claim 36, wherein the axial direction of the electrode is perpendicular to the axial direction of the coil assembly.
The plant protection drone according to any one of claims 35 to 37, wherein the bracket includes a first side wall and a second side wall disposed oppositely, wherein one electrode is provided on the first side wall On one side, another electrode is provided on one side of the second side wall;

The first side wall and the second side wall are respectively provided with electrode mounting holes, the pipe side wall is provided with a through hole corresponding to the position of the electrode mounting hole, and the electrode mounting hole communicates with the through hole ;

After the detection end of one electrode passes through the electrode mounting hole of the first side wall and the corresponding through hole, it is at least partially exposed in the pipe, and the detection end of the other electrode passes through the electrode of the second side wall After the installation hole and the corresponding through hole, at least part of it is exposed in the pipe.
The plant protection drone according to claim 38, wherein the electromagnetic flowmeter is further provided with a first sealing ring, the first sealing ring is sleeved on the electrode, and is used to seal the electrode and the The gap between the side walls of the electrode mounting hole.
The plant protection drone according to claim 39, wherein the side wall of the electrode is provided with a boss, the side wall of the electrode mounting hole is provided with a step surface, and the boss is in contact with the step surface Connect

The first sealing ring is disposed on a side of the boss away from the detection end of the electrode.
The plant protection drone according to claim 38, wherein the electromagnetic flowmeter further comprises:

Two electrode fixing plates are respectively used to fix the two electrodes on the corresponding side walls of the bracket.
The plant protection drone according to claim 41, wherein the electrode fixing plate is in contact with the electrode, and the electrode fixing plate is installed on the side wall of the bracket through a quick release connector, thereby Position the electrode within the bracket.
The plant protection drone according to claim 42, wherein the electrode fixing plate is provided with a first through hole, and the electrode fixing plate is sleeved on the tail end of the electrode through the first through hole, And the electrode fixing plate is sandwiched between the electrode and the signal acquisition plate on the corresponding side;

Wherein, the tail end of the electrode and the detection end of the electrode are respectively located at both ends of the electrode.
The plant protection drone according to claim 42, wherein an electrical connection hole is provided on the tail end of the electrode, and a conductive hole is provided on the signal acquisition board;

The electromagnetic flowmeter further includes two conductive connecting pieces, and the two conductive connecting pieces respectively cooperate with the conductive holes of the signal acquisition board on the corresponding side and the electrical connecting holes of the electrodes;

After the conductive connection piece passes through the conductive hole and is fixedly connected to the electrical connection hole, the electrode and the signal acquisition board on the corresponding side are electrically coupled and connected.
The plant protection drone according to claim 44, wherein the conductive connection member is a threaded fastener, and the signal collection board and the electrode are fixedly connected through the conductive connection member.
The plant protection drone according to claim 36, wherein the axis of the coil assembly is arranged substantially perpendicular to the extending direction of the pipe.
The plant protection drone according to claim 35, wherein the bracket further includes third and fourth side walls disposed oppositely, wherein one coil assembly is provided on one side of the third side wall, Another coil assembly is provided on one side of the fourth side wall.
The plant protection drone according to claim 35, 46, or 47, wherein the coil assembly includes a spiral coil, the spiral coil includes an iron core and a coil wound on the iron core, the coil The assembly also includes a coil fixing plate;

The coil fixing plate is fixedly connected to the corresponding side wall of the bracket, and the coil fixing plate and the corresponding side wall of the bracket surround to form an accommodation space, and the iron core and the coil are accommodated in the accommodation space Inside.
The plant protection drone according to claim 48, wherein the coil fixing plate is a metal plate.
The plant protection drone according to claim 35, wherein the bracket is made of plastic material.
The plant protection drone according to claim 35, wherein the bracket further comprises oppositely arranged fifth side walls and sixth side walls, and one of the open ends of the duct extends from the fifth side wall Out, the other open end of the pipe protrudes from the sixth side wall.
The plant protection drone according to claim 35 or 51, wherein the electromagnetic flowmeter further includes a housing and a cover plate, an opening is provided on one side of the housing, and the cover plate is used for covering The opening;

The bracket, the electrode, the signal acquisition board, the coil assembly and the control board are all provided in the housing;

One open end of the duct extends from a side wall of the housing opposite to the opening, and the other open end of the duct extends from the cover plate.
The plant protection drone according to claim 52, wherein the electromagnetic flowmeter further comprises a first pipe connection head and a second pipe connection head;

The first pipe connector is connected to one of the open ends of the pipe, and the second pipe connector is connected to the other open end of the pipe.
The plant protection drone according to claim 53, wherein the cover plate and/or the housing is an aluminum structure.
The plant protection drone according to claim 54, wherein the outer surface of the cover plate and/or the casing is coated with laser engraving technology.
The plant protection drone according to claim 52, wherein a second positioning portion is provided on the cover plate, and a positioning and matching portion is provided on the bracket, and the second positioning portion and the positioning and matching portion Connection, so that the cover plate is fixedly connected to the bracket.
The plant protection drone according to claim 52, wherein the cover plate is in conductive contact with the housing;

The control board is provided with a ground jack, and the electromagnetic flowmeter further includes a ground connector, and the ground connector is fixed to the cover plate through the ground jack so that the cover plate and the shell The body is grounded.
The plant protection drone according to claim 57, wherein the control board is disposed adjacent to the cover board.
The plant protection drone according to claim 58, wherein the side wall of the cover plate facing the opening is provided with a grounding protrusion, and the grounding connector passes through the grounding jack and is connected to the grounding The protrusion is detachably connected.
The plant protection drone according to claim 57, wherein the ground connection member is a threaded fastener.
The plant protection drone according to claim 57, wherein the electromagnetic flowmeter further comprises:

Electric plug

The control board is provided with a second electrical connection part, and the cover board is provided with a plug interface;

The second electrical connection portion is accommodated in the socket, and the electrical plug and the second electrical connection portion are mated in the socket.
The plant protection drone according to claim 35, wherein the electromagnetic flowmeter further comprises:

Signal line

Wherein, both ends of the signal line are electrically coupled to the two signal acquisition boards, the two coil assemblies are coaxially arranged, and the arrangement direction of the signal lines intersects the axes of the two coil assemblies , And the signal line is disposed around the end of one of the coil assemblies.
The plant protection drone according to claim 62, wherein the signal line is arranged substantially perpendicular to the extending direction of the pipeline.
The plant protection drone according to claim 62 or 63, wherein the two electrodes are coaxially arranged, and the central axis of the signal line is coplanar with the central axis of the electrode.
The plant protection drone according to claim 62 or 63, wherein the signal line has a preset width and a preset length, and the width direction of the signal line is parallel to the extending direction of the pipe.
The plant protection drone according to claim 62 or 63, wherein the bracket is square, and the signal lines are arranged along the symmetry axis of the side wall of the bracket.
The plant protection drone according to claim 62 or 63, wherein one end of the signal line is integrally formed with one of the signal acquisition boards;

The other end is provided with an electrical connector for detachable connection with the electrical connector of another signal acquisition board.
The plant protection drone according to claim 62 or 63, wherein the two ends of the signal line are respectively connected to the center positions of the sides of the two signal acquisition boards.