CN111699366A

CN111699366A - Electromagnetic flowmeter and agricultural plant protection machine

Info

Publication number: CN111699366A
Application number: CN201980010513.1A
Authority: CN
Inventors: 舒展; 周乐
Original assignee: SZ DJI Technology Co Ltd
Current assignee: SZ DJI Technology Co Ltd
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2020-09-22
Anticipated expiration: 2039-11-04
Also published as: CN114440991A; WO2021087666A1; CN111699366B

Abstract

An electromagnetic flowmeter (400) comprises a bracket (401), a pipeline (402), a measuring electrode (403), a coil assembly (404) and two signal acquisition boards (405), wherein one end of the pipeline is arranged on the bracket; the measuring electrodes comprise two first electrodes, the two first electrodes are oppositely arranged on two sides of the outer side wall of the pipeline, penetrate through the side wall of the pipeline respectively and then are contacted with liquid flowing through the pipeline, and detection ends of the two first electrodes are oppositely arranged; the coil assembly is arranged on one side of the outer side wall of the pipeline, and the axial direction of the coil assembly is orthogonal to the connecting line of the detection ends of the two first electrodes; the two signal acquisition plates are used for acquiring signals of the first electrodes on the corresponding sides; the pipeline comprises two planar electrode mounting surfaces (4021) which are arranged oppositely, a first electrode mounting hole is formed in each electrode mounting surface, a detection end of each first electrode penetrates through each first electrode mounting hole, and the end face of each detection end of each first electrode is basically flush with the inner side wall of the pipeline. An agricultural plant protection machine including the electromagnetic flow meter is also provided.

Description

Electromagnetic flowmeter and agricultural plant protection machine

Technical Field

The invention relates to the field of flow detection, in particular to an electromagnetic flowmeter and an agricultural plant protection machine.

Background

With the gradual popularization of agricultural plant protection machines, the requirement on the spraying precision is higher and higher. The spraying flow is low, so that the spraying is leaked or the protection is not in place, and the high flow causes adverse effects such as seedling burning. In addition, the sprayed amount is an important parameter during plant protection operation, the precision of the existing liquid level meter is limited, and the statistical operation area of the flyer is influenced. In order to improve the control accuracy of spraying and the calculation accuracy of the sprayed amount, an electromagnetic flow meter is used.

The potential detection of the existing electromagnetic flowmeter is realized by a pair of metal electrodes inserted into the pipeline, and the metal electrodes are called detection electrodes. The existing pipeline is generally round, and the end face of the detection electrode is a plane, so that the detection electrode can extend out of the pipeline by a certain length and cannot be flush with the pipeline, which can cause the flow field to be disordered and influence the measurement precision; the protruding sensing electrodes also foul, clogging the electromagnetic flow meter over time.

Disclosure of Invention

The invention provides an electromagnetic flowmeter and an agricultural plant protection machine.

Specifically, the invention is realized by the following technical scheme:

according to a first aspect of the present invention, there is provided an electromagnetic flow meter comprising:

a support;

one end of the pipeline is arranged on the bracket, and the pipeline is exposed out of the bracket close to the opening end of the bracket;

the measuring electrode is matched with the pipeline and comprises two first electrodes, the two first electrodes are oppositely arranged on two sides of the outer side wall of the pipeline, the detection ends of the two first electrodes can be contacted with liquid flowing through the pipeline after respectively penetrating through the side wall of the pipeline, and the detection ends of the two first electrodes are oppositely arranged;

the coil assembly is arranged on one side of the outer side wall of the pipeline, and the axial direction of the coil assembly is orthogonal to a connecting line of the detection ends of the two first electrodes; and

the two signal acquisition plates are arranged on the same side of the outer side wall of the pipeline corresponding to the two first electrodes, and are electrically coupled with the first electrodes on the corresponding sides and used for acquiring signals of the first electrodes on the corresponding sides;

the pipeline comprises two planar electrode mounting surfaces which are arranged oppositely, first electrode mounting holes are formed in the electrode mounting surfaces, the detection ends of the first electrodes penetrate through the first electrode mounting holes respectively, and the end faces of the detection ends of the first electrodes are basically flush with the inner side wall of the pipeline.

According to a second aspect of the invention, an agricultural plant protection machine is provided, which comprises a frame, a water tank, a water separator, an electromagnetic flow meter, a pump device and a spray head, wherein the water tank and the spray head are mounted on the frame, a water inlet of the water separator is communicated with a water outlet of the water tank, a water outlet of the water separator is communicated with a water inlet of the pump device through the electromagnetic flow meter, and a water outlet of the pump device is communicated with the spray head;

wherein the electromagnetic flow meter comprises:

a support;

one end of the pipeline is arranged on the support, the opening end, close to the support, of the pipeline is exposed out of the support and is communicated with the water outlet of the water separator, and the opening end, far away from the support, of the pipeline is communicated with the water inlet of the pump device;

According to the technical scheme provided by the embodiment of the invention, the electrode mounting surface on the pipeline is designed to be planar, when the first electrode (namely the detection electrode) is mounted in the first electrode mounting hole on the electrode mounting surface, the end surface of the detection end of the first electrode is basically flush with the inner side wall of the pipeline, the continuity of a flow field is ensured, and the measurement precision is improved; meanwhile, the scale is prevented, and the cleaning and maintenance of the flowmeter are more convenient.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.

FIG. 1 is a schematic cross-sectional view of an electromagnetic flow meter in an embodiment of the invention;

FIG. 2 is a cross-sectional schematic view of an electromagnetic flow meter in another embodiment of the invention;

FIG. 3 is a cross-sectional schematic view of an electromagnetic flow meter in another embodiment of the invention;

FIG. 4 is a schematic perspective view of an electromagnetic flow meter in an embodiment of the invention;

FIG. 5 is a cross-sectional schematic view of an electromagnetic flow meter in another embodiment of the invention;

FIG. 6 is a cross-sectional schematic view of an electromagnetic flow meter in another embodiment of the invention;

FIG. 7 is a fragmentary schematic illustration of a partial structure of an electromagnetic flowmeter in an embodiment of the invention;

FIG. 8 is a broken-away schematic view of another partial structure of an electromagnetic flow meter in an embodiment of the invention;

FIG. 9 is a schematic perspective view of an electromagnetic flow meter in another embodiment of the invention;

FIG. 10 is a schematic view of an agricultural plant protection machine according to another embodiment of the present invention;

FIG. 11 is a schematic perspective view of an agricultural plant protection machine in another embodiment of the present invention;

fig. 12 is a perspective view of an agricultural plant protection machine in another embodiment of the present invention in another orientation.

Reference numerals:

100: a frame;

200: a water tank; 201: a box body; 2011: a groove; 202: a main pipeline; 2021: a first water outlet;

300: a water separator;

400: an electromagnetic flow meter; 401: a support; 402: a pipeline; 4021: an electrode mounting surface; 403: a measuring electrode; 404: a coil assembly; 4041: an iron core; 4042: a bobbin; 4043: a coil; 405: a signal acquisition board; 4051: a first signal acquisition board; 4052: a second signal acquisition board; 4053: a third signal acquisition board; 406: a fastener; 407: a quick release connector; 408: a second electrode; 409: a main water inlet; 410: a main circuit board; 4101: an electrical connection portion; 4102: a coil socket; 4103: an external interface; 411: a signal line; 412: a shock-absorbing structure; 413: a reinforcing plate; 414: a housing; 415: a cover body; 416: a water diversion cavity; 417: a flow guide structure; 418: a transition curved surface; 419: a sealing structure;

500: a pump device;

600: a quick-release fixing piece; 601: fastening a nut; 602: a flange nut;

700: a branch pipe;

800: a gasket;

900: a seal ring;

1000: and a fixing member.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, in the following examples and embodiments, features may be combined with each other without conflict.

Referring to fig. 1 to 6, an embodiment of the present invention provides an electromagnetic flowmeter, where the electromagnetic flowmeter 400 may include a support 401, a pipe 402, a measuring electrode 403, a coil assembly 404, and a signal acquisition board 405. Wherein, one end of the pipeline 402 is arranged on the bracket 401, and the opening end of the pipeline 402 close to the bracket 401 is exposed out of the bracket 401, the pipeline 402 of this embodiment is used for liquid (for example, when the electromagnetic flowmeter 400 is applied to an agricultural plant protection machine, the liquid can be water or liquid pesticide) to flow through.

The measuring electrode 403 is matched with the pipeline 402, the measuring electrode 403 of the embodiment includes two first electrodes, the two first electrodes are oppositely arranged on two sides of the outer side wall of the pipeline 402, and the detection ends of the two first electrodes can contact with the liquid flowing through the pipeline 402 after respectively penetrating through the side wall of the pipeline 402. Moreover, the detection ends of the two first electrodes are arranged oppositely, that is, the connection line of the detection ends of the two first electrodes is orthogonal to the flow direction of the liquid in the pipeline 402. In this embodiment, the pipeline 402 includes two planar electrode mounting surfaces 4021 arranged oppositely, first electrode mounting holes are formed on the electrode mounting surfaces 4021, the detection ends of the first electrodes respectively penetrate through the first electrode mounting holes, and the end surfaces of the detection ends of the first electrodes are substantially flush with the inner side wall of the pipeline 402. It should be noted that, in the embodiment of the present invention, substantially flush means that the end surface of the detection end of the first electrode is considered to be coplanar with the inner side wall of the pipe 402 within an allowable error range.

Further, the coil assembly 404 is configured to generate an electromagnetic field, and the coil assembly 404 is disposed on one side of the outer side wall of the pipeline 402, in this embodiment, the axial direction of the coil assembly 404 is orthogonal to the connection line of the detection ends of the two first electrodes, that is, the flow direction of the liquid in the pipeline 402, the axial direction of the coil assembly 404, and the connection line of the detection ends of the two first electrodes of this embodiment are orthogonal to each other, so as to meet the requirement of electromagnetic induction detection. In this embodiment, the coil assembly 404 is used to generate an electromagnetic field, which is an alternating magnetic field, and the electromagnetic field generated by the coil assembly 404 is capable of passing through the pipe 402 into the pipe 402. When the flow rate of the liquid flowing through the pipe 402 changes, the difference between the induced electromotive forces of the two first electrodes also changes under the action of the electromagnetic field. Furthermore, the two signal collecting plates 405 and the two first electrodes are correspondingly disposed on the same side of the outer side wall of the pipeline 402, and the signal collecting plates 405 and the first electrodes on the corresponding sides are electrically coupled, and the signal collecting plates 405 of this embodiment are used for collecting signals of the first electrodes on the corresponding sides.

In the electromagnetic flowmeter 400 of the embodiment of the present invention, by designing the electrode mounting surface 4021 on the pipeline 402 to be planar, when the first electrode (i.e., the detection electrode) is mounted in the first electrode mounting hole on the electrode mounting surface 4021, the end surface of the detection end of the first electrode is substantially flush with the inner side wall of the pipeline 402, thereby ensuring the continuity of the flow field and improving the measurement accuracy; meanwhile, the scale is prevented, and the cleaning and maintenance of the flowmeter are more convenient.

The flow rate and/or velocity of the liquid flowing through the pipe 402 can be obtained from the signals collected by the two signal collecting plates 405. Alternatively, the flow rate Q of the liquid flowing through the pipe 402 is calculated as follows:

in the formula (1), B is the magnetic field intensity; u is induced electromotive force generated by the two first electrodes; a is the cross-sectional area of the conduit 402; d is the distance between the two electrode mounting faces 4021 on the conduit 402 for mounting the two first electrodes; k is a correction coefficient, and the magnitude of k can be set in consideration of factors such as the velocity of the liquid in the pipe 402 and the fact that the magnetic field intensity is not uniform, so as to reduce the error between the flow rate Q of the liquid flowing through the pipe 402 obtained by the calculation of the formula (1) and the flow rate of the liquid actually flowing through the pipe 402.

Alternatively, k is approximately 0.8, for example, k may be 0.8 ± 0.05. For a particular size of electromagnetic flowmeter 400 for a particular operating condition, the magnitude of k may be calibrated by volumetric (the volume of liquid flowing through conduit 402 over time).

After calculating the flow rate Q of the liquid flowing through the pipe 402 according to equation (1), the velocity of the liquid flowing through the pipe 402 can be calculated from the flow rate Q of the liquid flowing through the pipe 402.

Optionally, the bracket 401 is made of plastic, which can reduce the weight of the electromagnetic flow meter 400. Of course, the material of the bracket 401 is not limited to plastic, and other materials with lighter weight can be selected.

The pipe 402 of this embodiment may be a straight pipe or a curved pipe. In addition, the pipe 402 may be made of a plastic material, which facilitates penetration of a magnetic field and reduces the weight of the electromagnetic flow meter 400; of course, the material of the pipe 402 is not limited to plastic, and other materials that are light and easy to penetrate the magnetic field may be selected. It is understood that the material of the conduit 402 and the material of the bracket 401 may be the same or different. Further, the pipe 402 may be provided integrally with the bracket 401; of course, the conduit 402 and the frame 401 may be separate structures.

Optionally, the cross section of the flow channel of the conduit 402 is a regular polygon, such as a square or other regular polygon, where the electrode mounting surface 4021 is two opposite and parallel side walls of the conduit 402.

Because the first electrode needs to stretch into the liquid in the pipeline 402, so need consider waterproof problem, for preventing the liquid in the pipeline 402 from leaking from the first electrode mounting hole and getting into signal acquisition board 405, the mode that now adopts the cover sealing washer on detecting electrode realizes waterproofly to fix detecting electrode on pipeline 402 through electrode set screw. In this embodiment, the first electrode mounting hole is communicated with the flow channel of the pipeline 402, the first electrode is integrally formed in the first electrode mounting hole, the fixed connection between the first electrode and the pipeline 402 is realized, liquid in the pipeline 402 cannot leak from the first electrode mounting hole, the step of mounting the first electrode in the first electrode mounting hole is omitted, and the existing sealing ring and electrode fixing screw are saved, so that the cost is reduced, and the mounting difficulty is reduced. Optionally, the first electrode is embedded in the first electrode mounting hole through in-film injection molding, that is, the first electrode is integrally formed in the first electrode mounting hole through in-film injection molding; it should be understood that other processes or methods may be used to integrally form the first electrode within the first electrode mounting aperture.

In order to enable the two first electrodes to better generate induced electromotive force, the two first electrodes are coaxially arranged, namely the detection ends of the two first electrodes are opposite; in addition, the axial directions of the two first electrodes are perpendicular to the axial direction of the coil assembly 404, so that the flow direction of the liquid in the pipeline 402, the axial direction of the coil assembly 404 and the axial directions of the two first electrodes are orthogonal to each other, and the electromagnetic induction detection requirement is met. By adopting the arrangement of the first electrode and coil assembly 404 of the present embodiment, the structure of the electromagnetic flowmeter 400 is more compact, thereby reducing the volume of the electromagnetic flowmeter 400. For example, the extending direction of the pipe 402 is a left-right direction, that is, the flow direction of the liquid in the pipe 402 is a left-right direction, the two first electrodes are coaxially provided on both upper and lower sides of the pipe 402, and the axial direction of the coil assembly 404 coincides with the front-rear direction of the pipe 402.

The signal acquisition board 405 of this embodiment may be made of plastic or other light materials to reduce the weight of the electromagnetic flowmeter 400.

The signal collecting plate 405 and the first electrode on the corresponding side may be electrically coupled by direct contact, for example, in some embodiments, the signal collecting plate 405 is provided with a through hole (not labeled), and the signal collecting plate 405 is sleeved on the tail end of the first electrode through the through hole, so as to achieve electrical connection between the signal collecting plate 405 and the first electrode. In this embodiment, the signal acquisition board 405 is provided with the through hole, so that the signal acquisition board 405 is electrically connected to the tail end of the first electrode, and the signal acquisition board 405 is electrically connected to the first electrode, and meanwhile, the electrical plug connection mode is favorable for stable transmission of signals; it should be understood that in other embodiments, other direct contact means (e.g., the signal collecting plate 405 directly abuts against the end face of the first electrode) may be used to electrically connect the signal collecting plate 405 and the first electrode. The tail end of the first electrode and the detection end of the first electrode are respectively positioned at two ends of the first electrode.

The signal collecting board 405 and the first electrode on the corresponding side may be electrically coupled by an indirect connection manner, for example, the signal collecting board 405 and the first electrode are connected by a conductive connecting member, wherein one end of the conductive connecting member is connected to the signal collecting board 405 to achieve electrical connection between the conductive connecting member and the signal collecting board 405, and the other end of the conductive connecting member is connected to the tail end of the first electrode to achieve electrical connection between the conductive connecting member and the first electrode. Optionally, the signal collecting board 405 is provided with a first conductive hole, the tail end of the first electrode is provided with a second conductive hole, one end of the conductive connecting member is electrically matched with the first conductive hole, and the other end of the conductive connecting member is matched with the second conductive hole.

Referring to fig. 2, in some embodiments, the signal collecting plate 405 is mounted on the tail portion of the first electrode through a fastener 406, and the signal collecting plate 405 is stably connected to the first electrode through the fastener 406, so that the electrical connection between the signal collecting plate 405 and the first electrode is more stable, which facilitates stable transmission of signals between the signal collecting plate 405 and the first electrode. The type of the fastener 406 may be selected as desired, and the fastener 406 of the present embodiment includes at least one of: threaded fasteners, snaps. Wherein the threaded fastener may be a screw or a bolt. It is understood that the type of fastener 406 is not limited thereto and other quick release configurations are possible.

Referring to fig. 3, in some embodiments, the signal collecting plate 405 is mounted on the sidewall of the pipeline 402 by a quick release connector 407, and the signal collecting plate 405 is stably connected to the outer sidewall of the pipeline 402 by the quick release connector 407, so that the electrical connection between the signal collecting plate 405 and the first electrode is more stable, which facilitates stable transmission of signals between the signal collecting plate 405 and the first electrode. The type of the quick release connector 407 can be selected according to the requirement, and the quick release connector 407 of the present embodiment may include at least one of the following: threaded fasteners, snaps. Wherein the threaded fastener may be a screw or a bolt. It is understood that the type of quick release connector 407 is not limited thereto, and other quick release configurations are possible.

It should be appreciated that the two embodiments of mounting the signal acquisition board 405 on the tail of the first electrode by fasteners and mounting the signal acquisition board 405 on the sidewall of the conduit 402 by quick release connectors 407 may be combined to make the electrical connection between the signal acquisition board 405 and the first electrode more stable, facilitating stable transmission of signals between the signal acquisition board 405 and the first electrode.

In addition, the signal collecting plate 405 may abut against the first electrode to increase the compactness of the structure, which is advantageous for the miniaturized design of the electromagnetic flow meter 400.

In the embodiment, referring to fig. 1 to 6 again, the electromagnetic flowmeter 400 may further include two second electrodes 408, the two second electrodes 408 are respectively disposed at two open ends of the pipe 402, and the two second electrodes 408 are disposed at two sides of one of the first electrodes, and after the heads of the two second electrodes 408 respectively pass through the side wall of the pipe 402, the two second electrodes can contact with the liquid flowing through the pipe 402. A second electrode 408 mounting hole is further formed in one of the electrode mounting surfaces 4021, a head of the second electrode 408 penetrates through the second electrode 408 mounting hole, and an end face of the head of the second electrode 408 is substantially flush with an inner side wall of the pipe 402. Further, the tail portions of the two second electrodes 408 are in contact with the signal collecting plate 405 on the corresponding side to be grounded. The second electrode 408 is grounded to connect the signal acquisition board 405 with the liquid in the pipeline 402, and the grounding point is used as a potential reference point of the electromagnetic flowmeter 400 to realize accurate detection of the flow rate and/or the flow velocity. It should be noted that, in the embodiment of the present invention, one of two open ends of the duct 402 serves as a water inlet of the duct 402, and the other open end serves as a water outlet of the duct 402. The second electrodes 408 are respectively arranged at the water inlet and the water outlet of the pipeline 402, so that the liquid in the water inlet and the water outlet of the pipeline 402 are respectively grounded, and the current circulation is realized. The ground path includes: the liquid- > corresponding second electrode 408- > signal acquisition plate 405 in the water inlet of the pipeline 402, and the liquid corresponding second electrode 408- > signal acquisition plate 405 in the water outlet of the pipeline 402.

In this embodiment, the mounting hole of the second electrode 408 is communicated with the flow channel of the pipe 402, and the second electrode 408 is integrally formed in the mounting hole of the second electrode 408. Through with second electrode 408 integrated into one piece in second electrode 408 mounting hole, realized the fixed connection of second electrode 408 and pipeline 402, liquid in the pipeline 402 can not leak from second electrode 408 mounting hole, has saved the step in installing second electrode 408 mounting hole with second electrode 408 simultaneously, need not adopt the sealing washer sealed second electrode 408, also need not adopt electrode set screw fixed second electrode 408 to the cost is reduced, and the installation degree of difficulty is reduced. Optionally, the second electrode 408 is embedded in the mounting hole of the second electrode 408 by injection molding, that is, the second electrode 408 is integrally formed in the mounting hole of the second electrode 408 by injection molding; it should be understood that other processes or methods may be used to integrally form the second electrode 408 within the second electrode 408 mounting aperture.

In this embodiment, the signal collecting plate 405 is provided with a grounding hole at a position corresponding to the second electrode 408, and the tail of the second electrode 408 is matched with the grounding hole to realize grounding of the second electrode 408. The second electrode 408 is grounded by providing a grounding hole on the signal collecting plate 405.

Further, referring to fig. 2, in some embodiments, the signal collecting plate 405 is mounted on the tail portion of the second electrode 408 by the fastener 406, and the signal collecting plate 405 is stably connected to the second electrode 408 by the fastener 406, so as to ensure that the second electrode 408 is always grounded. The type of the fastener 406 may be selected as desired, and the fastener 406 of the present embodiment includes at least one of: threaded fasteners, snaps. Wherein the threaded fastener may be a screw or a bolt. It is understood that the type of fastener 406 is not limited thereto and other quick release configurations are possible.

The first electrode 408 and the second electrode 408 of this embodiment are both metal electrodes.

Referring to fig. 5, the coil assembly 404 may include an iron core 4041, a coil former 4042 sleeved on the iron core 4041, and a coil 4043 wound on the coil former 4042, wherein the iron core 4041 may restrict a magnetic field direction and reduce magnetic leakage. The coil former 4042 of the present embodiment is fixedly connected to the outer sidewall of the pipe 402, the coil former 4042 is matched with the outer sidewall of the pipe 402 to form a closed receiving space, and the iron core 4041 is received in the receiving space, so that the electromagnetic field is sealed in the receiving space by the coil former 4042 and the pipe 402. Optionally, the coil former 4042 is a metal frame, such as an iron frame or a steel frame, and the metal frame can shield the electromagnetic field generated by the coil assembly 404, so as to seal the electromagnetic field in the receiving space.

The conduit 402 of this embodiment may include one, two, three, four, or more than four conduits, thereby enabling the measurement of liquid flow and/or flow rate in a single channel, two channels, three channels, four channels, or more than four channels.

Referring to fig. 4 to 9, the plurality of pipes 402 and the plurality of measuring electrodes 403 are respectively included, the plurality of pipes 402 are disposed substantially in parallel, and the plurality of measuring electrodes 403 are correspondingly matched with the plurality of pipes 402, where the implementation process of matching the measuring electrodes 403 with the pipes 402 to measure the flow rate and/or the flow velocity of the liquid in the pipes 402 may refer to the description of the corresponding parts of the above embodiments, and is not repeated here. In the embodiment of the present invention, the substantially parallel means that the plurality of pipes 402 are considered to be parallel to each other within an allowable angle error range.

In this embodiment, the first electrodes of the plurality of measurement electrodes 403 are oppositely disposed in two rows, for example, the extending direction of the pipe 402 is the left-right direction, one of the two first electrodes corresponding to each pipe 402 is disposed at the bottom of the pipe 402, and the other is disposed at the top of the pipe 402. Further, the electromagnetic flow meter 400 can further comprise a main water inlet 409, the main water inlet 409 and the plurality of pipelines 402 are arranged at the opening ends of the support 401 and are respectively communicated, and the electromagnetic flow meter 400 of the embodiment also achieves the function of a water separator. If the electromagnetic flowmeter 400 is applied to an agricultural plant protection machine, the main water inlet 409 can be communicated with a water outlet of a water tank 200 of the agricultural plant protection machine, liquid in the water tank 200 flows into the main water inlet 409 through the water outlet of the water tank 200, and then flows into the corresponding pipeline 402 through the open ends of the pipelines 402 arranged on the support 401, so that the function of the water separator is realized.

Correspondingly, the two open ends of each pipe 402 are respectively provided with a second electrode 408, and the way of matching the second electrode 408 with the pipe 402 can be referred to the description of the corresponding parts of the above embodiments, and is not described herein again.

The following embodiment will describe the structure of the electromagnetic flowmeter 400 of the present embodiment in detail, taking the case where the four pipes 402 are included as an example.

Referring to fig. 5 and fig. 6, the coil assemblies 404 of the present embodiment may include two coil assemblies, wherein one coil assembly 404 is disposed between two adjacent pipes 402, and the other coil assembly 404 is disposed between two adjacent pipes 402. In this embodiment, the magnetic field direction is perpendicular to the liquid direction. Two groups of coils are symmetrically arranged in the middle of the four pipelines 402, so that the magnetic field intensity at the center of the four pipelines 402 is ensured to be consistent as much as possible, and the measurement precision is ensured. It should be noted that, in the embodiment of the present invention, the magnetic field strength at the center of the middle two pipes 402 in the four pipes 402 is slightly greater than the magnetic field strength at the center of the two pipes 402 on the outer side, and the correction coefficient k in the formula (1) may be adjusted according to the difference in the magnetic field strength, so as to eliminate the influence of the difference in the magnetic field strength, and improve the detection accuracy of the liquid flow rate in each pipe 402.

The coil assembly 404 is clamped between two adjacent pipes 402, and two ends of the coil former 4042 of the coil assembly 404 are respectively connected with the outer side wall of the pipe 402 on the corresponding side in a sealing manner, so that the coil former 4042 is matched with the outer side walls of the pipes 402 on two sides to form a closed accommodating space, so that the electromagnetic field is sealed in the accommodating space through the coil former 4042 and the pipes 402.

In this embodiment, the two coil assemblies 404 are coaxially disposed, and the axial directions of the two coil assemblies 404 are perpendicular to the axial directions of the two first electrodes corresponding to each pipe 402, and the axial directions of the two coil assemblies 404 are also perpendicular to the center line of the pipe 402. The arrangement of the second electrode 408 and the coil assembly 404 of the present embodiment enables the structure of the electromagnetic flowmeter 400 to be more compact, thereby reducing the volume of the electromagnetic flowmeter 400.

For two rows of first electrodes on the four pipelines 402, four signal collecting plates 405 corresponding to one row of first electrodes are integrally formed to form a first signal collecting plate 4051, and two pairs of four signal collecting plates 405 corresponding to the other row of first electrodes are integrally formed to form a second signal collecting plate 4052 and a third signal collecting plate 4053 respectively. When the first signal collecting plate 4051, the second signal collecting plate 4052 and the third signal collecting plate 4053 are installed on the pipeline 402, the first signal collecting plate 4051 is parallel to the second signal collecting plate 4052 and the third signal collecting plate 4053, and the first signal collecting plate 4051 is arranged opposite to the second signal collecting plate 4052 and the third signal collecting plate 4053, and the second signal collecting plate 4052 and the third signal collecting plate 4053 are located on the same plane. The structure design mode facilitates the fixation of the structures.

Further, referring to fig. 6 to 8, the electromagnetic flowmeter 400 further includes a main circuit board 410 and two signal wires 411, the main circuit board 410 is disposed on one side of the first signal collecting board 4051, an electrical connection portion 4101 is disposed on the main circuit board 410 at a position opposite to the second signal collecting board 4052 and the third signal collecting board 4053, an electrical matching portion is disposed at a position corresponding to the first signal collecting board 4051, and the electrical connection portion 4101 is connected with the electrical matching portion to electrically connect the first signal collecting board 4051 and the main circuit board 410. Two ends of one signal wire 411 are respectively connected with the same sides of the first signal acquisition board 4051 and the second signal acquisition board 4052, so as to realize the electrical connection between the first signal acquisition board 4051 and the second signal acquisition board 4052. Two ends of the other signal wire 411 are respectively connected to the same sides of the first signal collecting board 4051 and the third signal collecting board 4053, so as to electrically connect the first signal collecting board 4051 and the third signal collecting board 4053. The two signal lines 411 are substantially parallel to each other. Optionally, the main circuit board 410 is configured to obtain the flow rate and/or the velocity of the liquid in the four pipes 402 according to the signals collected by the first signal collecting board 4051, the second signal collecting board 4052, and the third signal collecting board 4053.

In the embodiment, the detection circuit is arranged on the signal acquisition board 405, and the signal is relatively weak; the power signal and the processing circuit are arranged on the main circuit board 410, the signals are relatively strong, and the interference of strong signals to weak signals is avoided, so that the detection precision is ensured. Meanwhile, the electric connection part 4101 and the electric matching part are arranged at the positions opposite to the middle of the second signal acquisition board 4052 and the third signal acquisition board 4053, so that the length difference of detection loops of the four pipelines 402 is small, and the detection precision is improved.

In addition, the main circuit board 410 of the present embodiment can supply power to the first signal collecting board 4051, the second signal collecting board 4052, the third signal collecting board 4053, the coil block 404, and the like, and can perform calculation, amplification, and the like of signals.

Further, referring to fig. 7, the main circuit board 410 may further include a coil socket 4102 for electrically coupling with the coil assembly 404 to energize the coil assembly 404 through the main circuit board 410.

Referring again to fig. 7, the main circuit board 410 is further provided with an external interface 4103, and the external interface 4103 is used for electrically connecting with external devices to electrically connect the electromagnetic flow meter 400 with the external devices. Optionally, the main circuit board 410 calculates the flow rate and/or the velocity of the liquid in the four pipes 402, and then sends the flow rate and/or the velocity of the liquid in the four pipes 402 to the external device through the external interface 4103. Optionally, the main circuit board 410 acquires and amplifies signals acquired by the first signal acquisition board 4051, the second signal acquisition board 4052, and the third signal acquisition board 4053, and the main circuit board 410 further sends the amplified signals to an external device, and the external device calculates the flow rate and/or the velocity of the liquid in the four pipes 402 according to the amplified signals.

Due to structural constraints, the signal line may cross the electromagnetic field, which may result in a closed conductor loop within the electromagnetic field. And because the electromagnetic field in the electromagnetic flowmeter is an alternating magnetic field, if the plane formed by the conductor loops is not parallel to the direction of the magnetic field, the interference is called differential interference, and the interference is influenced by the changed magnetic field to generate induced electromotive force to interfere the measurement signal. The existence of differential interference can affect the stability of a flow velocity signal and reduce the measurement accuracy, an effective solution is lacked in the industry for a long time, and the problem cannot be solved well by means of manual adjustment, software evasion and the like. At present, most of electromagnetic flowmeters are designed to finely adjust the mechanical structure of the position of a signal wire, and after the electromagnetic flowmeters are assembled, differential interference signals are observed manually, and the mechanical structure is finely adjusted manually, so that the interference signals are reduced. The method has low efficiency, the adjusting effect is difficult to accurately evaluate, and the method is not suitable for large-scale use of mass production products. Manual fine adjustment can only be used in small-batch customized flowmeter manufacturing, and the scheme cannot realize large-scale mass production, cannot ensure the consistency of products, and cannot use objective indexes to measure the effectiveness of adjustment; the software evasion method avoids interfering signal time by setting accurate sampling time, shortens the sampling time of effective signals, and limits the upper limit of excitation frequency if interference cannot be effectively inhibited in a high-frequency excitation scene, and seriously affects signal measurement if the interference is too large particularly under the condition that signals are weak in a micro electromagnetic flowmeter.

In contrast, the embodiment of the invention reduces the projection area of the conductor loop formed by the signal wire in the electromagnetic field direction as much as possible by adjusting the direction of the signal wire, suppresses differential interference within a reasonable range to reduce the interference degree, effectively controls the difference among individuals, and ensures that the difference of the assembled flowmeter is smaller.

The signal lines 411 are arranged in a direction intersecting the axis of the coil block 404, and the signal lines 411 are arranged around the outer sides of the four ducts 402. One signal wire 411 forms a structure similar to a "door" shape with the first signal collecting plate 4051 and the second signal collecting plate 4052, and the other signal wire 411 forms a structure similar to a "door" shape with the first signal collecting plate 4051 and the third signal collecting plate 4053. It should be noted that, in the embodiment of the present invention, the arrangement direction of the signal line 411 refers to an extending direction of the signal line 411 for connecting two connection ends of two signal acquisition boards 405. According to the embodiment of the invention, through the structural limit between the signal wire 411 and the two signal acquisition boards 405 which are reasonably designed, the projection area of a conductor loop formed by the signal wire 411 in the electromagnetic field direction is reduced as much as possible, the influence of differential interference on signals can be eliminated, the measurement accuracy of the electromagnetic flowmeter 400 is improved, the difference among individuals is effectively controlled, the assembled flowmeter difference is ensured to be small, and the signal consistency of the electromagnetic flowmeter 400 is better.

Further optionally, a shock absorbing structure 412 is disposed between the signal line 411 and the conduit 402 to prevent the signal line 411 from vibrating and generating electromagnetic interference. The shock absorbing structure 412 may include shock absorbing foam or other structures made of a shock absorbing material.

Alternatively, the pipe 402 is a straight pipe, and the signal line 411 is provided substantially perpendicular to the extending direction of the pipe 402. Because the axis of the coil assembly 404 is perpendicular to the extending direction of the pipeline 402, the central axis of the signal line 411 is also perpendicular to the axis of the coil assembly 404, and the projection of the conductor loop formed by the signal line 411 in the electromagnetic field direction is a point, therefore, the structural design mode can minimize the projection area of the conductor loop formed by the signal line 411 in the electromagnetic field direction, thereby eliminating the influence of differential interference on signals to the maximum extent and improving the measurement accuracy of the electromagnetic flowmeter 400. It is understood that the signal line 411 is substantially perpendicular to the extending direction of the pipe 402, which means that the included angle between the signal line 411 and the extending direction of the pipe 402 is 90 ° ± error value, that is, within the allowable error range, the signal line 411 is considered to be substantially perpendicular to the extending direction of the pipe 402.

Alternatively, the two first electrodes of each measuring electrode 403 are coaxially disposed, and the central axis of the signal line 411 is disposed coplanar with the central axis of the first electrodes. Because the axis of the coil assembly 404 is perpendicular to the central axis of the first electrode, the central axis of the signal line 411 is also perpendicular to the axis of the coil assembly 404, and the projection of the conductor loop formed by the signal line 411 in the electromagnetic field direction is a point, the structural design mode can minimize the projection area of the conductor loop formed by the signal line 411 in the electromagnetic field direction, thereby eliminating the influence of differential interference on signals to the maximum extent and improving the measurement accuracy of the electromagnetic flowmeter 400.

Optionally, the signal line 411 has a preset width and a preset length, the width direction of the signal line 411 is parallel to the extending direction of the pipeline 402, and the layout manner can also enable the central axis of the signal line 411 and the axis of the coil assembly 404 to be perpendicular to each other, so that the influence of differential interference on the signal is eliminated to the maximum extent, and the measurement accuracy of the electromagnetic flowmeter 400 is improved. It should be noted that, in the embodiment of the present invention, the width of the signal line 411 refers to a width of the signal line 411 perpendicular to the arrangement direction of the signal line 411. The preset width may be determined according to the number of signal paths between the two signal collecting boards 405.

Further optionally, the first signal collecting plate 4051, the second signal collecting plate 4052, and the third signal collecting plate 4053 are all square, and one signal wire 411 is arranged along a symmetry axis of the side portions of the first signal collecting plate 4051 and the second signal collecting plate 4052; another signal wire 411 is arranged along the symmetrical axis of the sides of the first signal collecting plate 4051 and the third signal collecting plate 4053, thereby ensuring that the axes of the two solenoid assemblies 404 pass through the signal wire 411.

The wiring mode of the signal line 411 ensures that the plane of the signal loop is parallel to the direction of the magnetic field, so that the signal loop is not interfered by the alternating magnetic field.

The shape of the signal line 411 may be designed as needed to increase the compactness of the structure to reduce the volume of the electromagnetic flow meter 400, and optionally, the signal line 411 has a sheet-like structure, and the signal line 411 is disposed substantially parallel to the side wall of the bracket 401.

The implementation manner of connecting the signal line 411 and the two signal acquisition boards 405 may be selected as required, for example, in some embodiments, two ends of the signal line 411 are detachably connected to the corresponding signal acquisition boards 405 through electrical connectors, respectively, to implement electrical coupling connection of the two signal acquisition boards 405.

In other embodiments, one end of the signal line 411 is integrally formed with one of the signal collecting plates 405, and the other end of the signal line 411 is provided with an electrical connector for detachable connection with the electrical connector of the other signal collecting plate 405, so that the signal line 411 is not easy to lose, and such a design does not cause trouble to the installation of the signal collecting plate 405 and reduces the weight of the electromagnetic flowmeter 400. It is understood that the electrical connector of the signal line 411 and the electrical connector of the signal acquisition board 405 are a male connector and a female connector which are matched with each other, and the male connector and the female connector are matched to realize the electrical coupling connection of the signal line 411 and the signal acquisition board 405.

The signal line 411 of this embodiment may be an FPC line, which is conveniently bent, so that the signal collecting boards 405 relatively disposed at both sides of the bracket 401 can be more conveniently connected. It should be understood that the signal line 411 may be other types of conductive lines.

It is to be understood that the layout manners of the signal lines 411 in the above embodiments may be combined with each other.

Referring to fig. 8, the reinforcing plates 413 are disposed on two sides of the signal line 411 to improve the strength of the signal line 411 and prolong the service life of the signal line 411.

In addition, in an alternative embodiment, the two signal acquisition boards 405 are overlapped by the signal transmission circuit board to realize signal transmission, and the two signal acquisition boards 405 and the signal transmission board form a structure similar to a shape like a Chinese character 'men', so that the influence of differential interference on signals is eliminated, and the measurement accuracy of the electromagnetic flowmeter 400 is improved.

Referring to fig. 4 to 9, the electromagnetic flowmeter 400 may further include a housing 414, the main water inlet 409 is disposed on one side of the bracket 401, the housing 414 is disposed on the other side of the bracket 401, and the housing 414 is fixedly connected to the bracket 401. The housing 414 cooperates with the frame 401 to form a receiving chamber, the open end of the conduit 402 remote from the frame 401 is exposed outside the housing 414, and the portion of the conduit 402 between the two open ends is received in the receiving chamber. The measuring electrode 403, the coil assembly 404, the signal acquisition board 405, the second electrode 408, the main circuit board 410, the signal wire 411, and the like are also accommodated in the accommodation chamber.

In the following embodiments, the pipe 402 is referred to as a water distribution pipe.

The embodiment of the invention provides an airborne spraying system which can be applied to an agricultural plant protection machine, such as a plant protection unmanned aerial vehicle or other agricultural spraying devices, and the agricultural plant protection machine comprises a rack 100. Referring to fig. 10-12, the on-board sprinkler system may include a water tank 200, a water separator 300, a flow meter, a pump device 500, a quick release fixture 600, and a branch conduit 700. Wherein, the water tank 200 includes a tank 201 and a main pipe 202, the tank 201 is used for installing the tank 201 on the rack 100, and the main pipe 202 is arranged outside the tank 201. The tank 201 of this embodiment has a reservoir chamber for storing liquid such as water or agricultural chemicals. And, a groove 2011 is arranged at one side of the box 201, and the groove 2011 is close to the rack 100.

In this embodiment, the water separator 300 is integrated on the flowmeter to form the electromagnetic flowmeter 400 of the above embodiment, which solves the problem of one-to-many pipelines, and simultaneously, does not need to add a special water separator module, and has a more compact structure.

Further, the main pipe 202 comprises a first water inlet (not shown) and a first water outlet 2021, the water separator 300 is provided with a second water inlet (i.e. the main water inlet 409 in the above embodiment) and a plurality of second water outlets, and a flow meter is used for detecting the flow rate and/or velocity of the liquid in each second water outlet. In this embodiment, trunk line 202, water knockout drum 300 and flowmeter all accept in recess 2011, and trunk line 202 pastes the lateral wall setting of establishing box 201, first water inlet and stock solution chamber intercommunication, and the top of recess 2011 is located to first delivery port 2021 to, first delivery port 2021 is located between water tank 200 and the frame 100. Further, the pump device 500 is adapted to be mounted on the tank 201, and the pump device 500 is located at the bottom of the rack 100. The second water inlet of this embodiment is mounted on the first water outlet 2021 through a quick release fastener 600, and the second water outlet is communicated with the water inlet of the pump device 500 through a branch pipe 700.

According to the onboard spraying system disclosed by the embodiment of the invention, the groove 2011 is formed in one side of the box body 201 of the water tank 200, the main pipeline 202, the water separator 300 and the flow meter of the water tank 200 are all accommodated in the groove 2011, and the main pipeline 202 is arranged by being attached to the side wall of the box body 201, so that the problem of messy pipeline layout of the multichannel spraying system is solved, and the compactness of the spraying system pipeline is improved; meanwhile, the water separator 300 and the main pipeline 202 can be quickly disassembled and assembled through the quick-release fixing piece 600, and the water separator 300 can be conveniently maintained and replaced.

Two open ends of water distribution pipeline are first open end and second open end respectively, and first open end, second open end are located water distribution pipeline's both ends. Moreover, the water diversion pipeline of the present embodiment includes a water inlet end and a water outlet end, one of the first opening end and the second opening end serves as the water inlet end, and the other serves as the water outlet end. The first open end is fixedly connected to the bracket 401, and the second open end is exposed out of the housing 414. Alternatively, the parts of the water distribution pipe except for the second opening end are all accommodated in an accommodating cavity formed by the shell 414 and the bracket 401 together.

The electromagnetic flow meter 400 further includes a cover 415, the second water inlet is disposed on the cover 415, the cover 414 and the bracket 401 surround to form a water diversion cavity 416, the second water inlet, the first open end and the water diversion cavity 416 are respectively communicated, and the second water outlet is the second open end.

In this embodiment, the liquid flow path includes: the liquid storage cavity- > the first water inlet- > the flow passage- > the first water outlet 2021- > the second water inlet- > the water diversion cavity 416- > the first open end- > the flow passage- > the second open end (namely, the second water outlet) of the water diversion pipeline.

Referring to fig. 6 again, the electromagnetic flowmeter 400 further includes a flow guide structure 417, a portion of the flow guide structure 417 is accommodated in the accommodating cavity, and the plurality of water diversion pipes are respectively disposed on two sides of the flow guide structure 417. The diversion structure 417 of this embodiment is provided with a diversion cone, the diversion cone is accommodated in the water diversion cavity 416, and the diversion cone is right opposite to the second water inlet, and after the liquid flows into the water diversion cavity 416 from the second water inlet, the liquid is diverted by the diversion cone, so that the liquid is uniformly distributed to both sides of the diversion cone. Optionally, the surface of the guide cone is arc-shaped, so that the impact force generated when the liquid passes through the surface of the guide cone is reduced.

Optionally, the diversion structure 417 is an axisymmetric structure, a central axis of the diversion structure 417 coincides with a central axis of the second water inlet, and the plurality of water distribution pipes are symmetrically arranged on two sides of the diversion structure 417, for example, for four-channel diversion, two water distribution pipes are respectively arranged on two sides of the diversion structure 417, and the four water distribution pipes are symmetrically arranged along the central axis of the diversion structure 417, so that liquid flow substrates flowing into the four water distribution pipes are the same, and uniform diversion is realized.

Referring to fig. 6 again, the inner side wall of the first opening end near the diversion cone is provided with a transition curved surface 418, so that the flow rates of the liquid flowing into the plurality of water distribution pipes are substantially the same, and the effect of uniformly spraying the pump device 500 is finally achieved. Optionally, the bending degree of the transition curved surface 418 of the first opening end is directly proportional to the distance from the first opening end to the diversion cone, that is, the smaller the bending degree of the transition curved surface 418 of the first opening end closer to the diversion cone is, the smaller the opening of the corresponding first opening end is, the larger the bending degree of the transition curved surface 418 of the first opening end farther from the diversion cone is, the larger the opening of the corresponding first opening end is, so that the flow rates of the liquids flowing into the plurality of pipelines tend to be consistent, and the problem of uneven spraying is solved.

The matching mode of the cover 415 and the bracket 401 can be designed as required, for example, in some embodiments, a clamping groove is formed in the edge of the cover 415, a clamping portion is formed in a corresponding position of the bracket 401, and the clamping portion is matched with the clamping groove to realize matching of the cover 415 and the bracket 401; of course, the mating method of the cover 415 and the bracket 401 is not limited to the snap-fit method, and other mating methods may be selected.

The manner in which the housing 414 cooperates with the bracket 401 may also be designed as desired, for example, in some embodiments, the housing 414 is fixed to the bracket 401 by a quick release structure, wherein the quick release structure may include at least one of a threaded fastener and a snap, and the threaded fastener may be a screw or a bolt; it should be understood that the type of quick release structure is not limited thereto, but may be other.

Further, the joint of the cover 415 and the bracket 401, the joint of the housing 414 and the bracket 401, and the joint of the second open end and the housing 414 are respectively provided with a sealing structure 419, such as a sealing ring, to achieve a waterproof function.

The structure of the quick-release fixing member 600 can be designed as required, please refer to fig. 5 and fig. 6 again, the quick-release fixing member 600 can include a fastening nut 601, the fastening nut 601 is sleeved on the second water inlet, furthermore, the fastening nut 601 is provided with an internal thread, and the outer side wall of the first water outlet is provided with an external thread matched with the internal thread.

Further, the quick release fastener 600 further includes a flange nut 602, the flange nut 602 is used for fixing the fastening nut 601 on the outer side wall of the second water inlet, specifically, the flange nut 602 is sleeved on the second water inlet, and one end of the flange nut 602 is received in the fastening nut 601, and an end of the flange nut 602 received in the fastening nut 601 is matched with an end of the first water outlet.

Furthermore, a gasket 800 is arranged between one end of the flange nut 602 accommodated in the fastening nut 601 and the end of the first water outlet, and the flange nut 602 is tightly matched with the first water outlet through the gasket 800, so that the tight fit between the first water outlet and the fastening nut 601 is realized.

In addition, in order to prevent liquid leakage, a seal ring 900 is arranged between one end of the flange nut 602 away from the fastening nut 601 and the outer side wall of the second water inlet, the inner ring of the seal ring 900 is sleeved on the outer side wall of the second water inlet, and the outer ring of the seal ring 900 is hermetically connected with the inner side wall of one end of the flange nut 602 away from the fastening nut 601.

Referring to fig. 10, the on-board sprinkler system may further include a fixing member 1000, and the fixing member 1000 is used to mount the second water outlet on the sidewall of the recess 2011, thereby fixing the water separator on the tank 201. Specifically, the fixing member 1000 is provided with a sleeve portion and a fixing portion, wherein the sleeve portion is sleeved on the second water outlet, and the fixing portion is detachably connected with the side wall of the groove 2011. The fixed part can be detachably connected to the side wall of the groove 2011 in a threaded connection mode, a clamping connection mode and the like.

The direction of the pipe between the flow meter and the pump device 500 inevitably turns for many times, and a general solution is to add an elbow, but one elbow means that two joints are provided, at least two nuts need to be screwed, when the number of the second water outlet and the pump device 500 is large, the number of the nuts needing to be screwed is also large, and the operation is very complicated. In this embodiment, the branch pipes 700 are U-shaped pipes, that is, the branch pipes 700 are directly integrated into a U-shaped pipe, and 2 elbow joints and at least 4 nuts are omitted for one U-shaped pipe. In this embodiment, one opening of the U-shaped tube is communicated with the second water outlet, and the other opening is communicated with the water inlet of the pump device 500, so as to communicate the flow meter with the pump device 500.

Optionally, the pump device 500 is accommodated in a U-shaped groove of a U-shaped tube, so that the structural compactness is improved; of course, in order to avoid the pump device 500 from colliding with the U-shaped tube and causing the U-shaped tube to be easily damaged, the pump device 500 may not be accommodated in the U-shaped groove of the U-shaped tube, for example, see fig. 12, the U-shaped tube is disposed below the pump device 500.

For the reason that the U-shaped pipe cannot be demoulded by a conventional method and cannot be processed by a conventional injection molding process, the embodiment of the present invention uses a blow molding process to process the U-shaped pipe, that is, the branch pipe 700 of the embodiment of the present invention is a blow molding integrally formed pipe.

In addition, the hardness of the material of the branch pipe 700 is greater than a preset hardness threshold value, and the branch pipe is conveniently processed into a U-shaped pipe.

In this embodiment, the number of the pump devices 500 may be equal to the number of the second water outlets, or the number of the pump devices 500 is smaller than the number of the second water outlets. In this embodiment, the number of the pump devices 500 is equal to the number of the second water outlets, and each second water outlet is communicated with the water inlet of the corresponding pump device 500 through a branch pipe 700. In this embodiment, a plurality of pump units 500 form a pump unit, and the pump unit is fixed to the case 201.

It should be noted that the electromagnetic flowmeter 400 of the above embodiment can be applied to an agricultural plant protection machine or other equipment with a liquid passage.

Referring to fig. 10 to 12, an embodiment of the present invention further provides an agricultural plant protection machine, which may include a rack 100, a water tank 200, a water separator 300, the electromagnetic flow meter 400 of the above embodiment, a pump device 500, and a spray head, wherein the water tank 200 and the spray head are mounted on the rack 100, a water inlet of the water separator 300 is communicated with a water outlet of the water tank 200, a water outlet of the water separator 300 is communicated with a water inlet of the pump device 500 through the electromagnetic flow meter 400, and a water outlet of the pump device 500 is communicated with the spray head. In this embodiment, the open end of the pipe 402 of the electromagnetic flowmeter 400, which is close to the support 401, is exposed outside the support 401 and is communicated with the water outlet of the water separator 300, and the open end of the pipe 402, which is far from the support 401, is communicated with the water inlet of the pump device 500.

The number of the spray heads is the same as that of the pump devices 500, and the spray heads are correspondingly communicated with the water outlets of the pump devices 500.

In this embodiment, the water separator 300 is integrated on the electromagnetic flow meter 400. Optionally, referring to fig. 11, the agricultural plant protection machine includes a plurality of pump devices 500, the plurality of pump devices 500 are communicated with the liquid storage cavity of the tank 201 through the main pipe 202, the electromagnetic flow meter 400 and the branch pipe 700, and are communicated with the corresponding spray heads through the water outlet pipe, and the liquid in the liquid storage cavity is sprayed out through the flow path of the main pipe 202, namely the first water inlet- > the first water outlet 2021- > the second water inlet- > the water splitting cavity 416- > the first open end- > the flow path of the water splitting pipe- > the second open end- > the branch pipe 700- > the water inlet of the pump device 500- > the water outlet pipe- > the spray heads, so as to spray the liquid (pesticide and water) to the crops. The water separator 300 uniformly distributes the liquid to the pump devices 500, and the plurality of pump devices 500 pump the liquid medicine to the corresponding nozzles.

The agricultural plant protection machine of this embodiment can be plant protection unmanned aerial vehicle, also can be pesticide spray truck or manpower sprinkler.

In this embodiment, the box 201 is fixedly connected to the frame 100. Taking plant protection unmanned aerial vehicle as an example, frame 100 includes the fuselage and the foot rest that links to each other with the fuselage bottom, box 201 and fuselage fixed connection. The fixed connection mode of the box 201 and the machine body can be any existing fixed mode, such as threads, clamping connection and the like. In addition, the rack 100 may further include a boom connected to the body, and the nozzle is disposed at an end of the boom away from the body.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The electromagnetic flowmeter and the agricultural plant protection machine provided by the embodiment of the invention are described in detail, a specific example is applied in the description to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. An electromagnetic flow meter, comprising:

a support;

2. The electromagnetic flowmeter of claim 1 wherein the flow path cross section of the conduit is in regular polygonal rows.

3. The electromagnetic flowmeter of claim 1 wherein the first electrode mounting hole is in communication with a flow passage of the conduit, the first electrode being integrally formed within the first electrode mounting hole.

4. The electromagnetic flow meter according to claim 3, wherein the first electrode is embedded in the first electrode mounting hole by in-film injection molding.

5. An electromagnetic flowmeter according to claim 1 wherein the two first electrodes are coaxially arranged, the axial directions of the two first electrodes being perpendicular to the axial direction of the coil assembly.

6. The electromagnetic flowmeter of claim 1, wherein the signal acquisition plate is provided with a through hole, and the signal acquisition plate is sleeved at the tail end of the first electrode through the through hole so as to realize the electrical connection between the signal acquisition plate and the first electrode;

the tail end of the first electrode and the detection end of the first electrode are respectively positioned at two ends of the first electrode.

7. The electromagnetic flowmeter of claim 6 wherein the signal acquisition board is mounted on the tail portion of the first electrode by a fastener.

8. The electromagnetic flow meter of claim 7, wherein the fasteners comprise at least one of: threaded fasteners, snaps.

9. The electromagnetic flowmeter of claim 1 wherein the signal acquisition board is mounted on a sidewall of the conduit by a quick disconnect connection.

10. The electromagnetic flowmeter of claim 9 wherein the quick release connection comprises at least one of: threaded fasteners, snaps.

11. The electromagnetic flowmeter of claim 1, further comprising two second electrodes disposed at two open ends of the pipe, respectively, and disposed at two sides of one of the first electrodes, wherein heads of the two second electrodes can contact the liquid flowing through the pipe after passing through the side wall of the pipe, respectively;

one of the electrode mounting surfaces is also provided with a second electrode mounting hole, the head of the second electrode penetrates through the second electrode mounting hole, and the end face of the head of the second electrode is basically flush with the inner side wall of the pipeline;

the tail parts of the two second electrodes are in contact with the signal acquisition plates on the corresponding sides so as to be grounded.

12. The electromagnetic flowmeter of claim 11 wherein the second electrode mounting hole is in communication with a flow passage of the conduit, the second electrode being integrally formed within the second electrode mounting hole.

13. The electromagnetic flowmeter of claim 12 wherein the second electrode is embedded within the second electrode mounting hole by in-mold injection.

14. The electromagnetic flowmeter of claim 11 wherein said signal acquisition board is provided with a grounding hole at a location corresponding to said second electrode, and wherein a tail portion of said second electrode cooperates with said grounding hole to ground said second electrode.

15. The electromagnetic flowmeter of claim 1 wherein the coil assembly comprises a core, a bobbin disposed around the core, and a coil wound around the bobbin;

the coil rack is fixedly connected with the outer side wall of the pipeline.

16. The electromagnetic flowmeter of claim 1 wherein said conduits and said measuring electrodes each comprise a plurality of said conduits disposed substantially in parallel, said plurality of measuring electrodes being correspondingly mated with said plurality of conduits, first electrodes of said plurality of measuring electrodes being disposed in two opposing rows;

the electromagnetic flowmeter comprises a main water inlet, and the main water inlet is communicated with the plurality of pipelines arranged at the open ends of the supports respectively.

17. The electromagnetic flowmeter of claim 16 wherein said conduits comprise four and said coil assemblies comprise two, one of said coil assemblies being disposed between two adjacent conduits of one of said sets and the other of said coil assemblies being disposed between two adjacent conduits of the other of said sets.

18. An electromagnetic flowmeter according to claim 17 wherein the two coil assemblies are arranged coaxially.

19. The electromagnetic flow meter according to claim 16, wherein the four signal collecting plates corresponding to the first electrode in the row are integrally formed to form a first signal collecting plate;

every two of the four signal acquisition plates corresponding to the other row of the first electrodes are integrally formed to form a second signal acquisition plate and a third signal acquisition plate respectively;

the first signal acquisition board is parallel to the second signal acquisition board and the third signal acquisition board, just the first signal acquisition board with the second signal acquisition board the third signal acquisition board sets up relatively, the second signal acquisition board with the third signal acquisition board is located the coplanar.

20. The electromagnetic flow meter of claim 19, further comprising a main circuit board and two parallel signal wires;

the main circuit board is arranged on one side of the first signal acquisition board, an electric connection part is arranged at a position, opposite to the second signal acquisition board and the third signal acquisition board, on the main circuit board, an electric matching part is arranged at a corresponding position of the first signal acquisition board, and the electric connection part is connected with the electric matching part to realize the electric connection of the first signal acquisition board and the main circuit board;

two ends of one signal wire are respectively connected with the same sides of the first signal acquisition board and the second signal acquisition board so as to realize the electric connection of the first signal acquisition board and the second signal acquisition board;

two ends of the other signal wire are respectively connected with the same sides of the first signal acquisition board and the third signal acquisition board so as to realize the electric connection of the first signal acquisition board and the third signal acquisition board;

the main circuit board is used for acquiring the flow and/or the speed of the liquid in the four pipelines according to the signals acquired by the first signal acquisition board, the second signal acquisition board and the third signal acquisition board.

21. The electromagnetic flowmeter of claim 20 wherein the signal wires are arranged in a direction that intersects the axis of the coil assembly and are disposed around the outside of the four conduits.

22. An electromagnetic flow meter according to claim 21, wherein a shock absorbing structure is provided between the signal wire and the conduit.

23. An electromagnetic flow meter according to claim 22, wherein the damping structure comprises damping foam.

24. The electromagnetic flowmeter of claim 20 or 21 wherein said signal lines are disposed substantially perpendicular to the direction of elongation of said conduit.

25. The electromagnetic flowmeter of claim 20 or 21 wherein the two first electrodes of each of the measuring electrodes are disposed coaxially, and the central axis of the signal line is disposed coplanar with the central axis of the first electrodes.

26. The electromagnetic flow meter according to claim 20 or 21, wherein the signal line has a preset width and a preset length, and a width direction of the signal line is parallel to an extending direction of the pipe.

27. The electromagnetic flow meter according to claim 20 or 21, wherein the first signal collecting plate, the second signal collecting plate, and the third signal collecting plate are each square, and wherein one of the signal lines is arranged along a symmetry axis of a side portion of the first signal collecting plate and the second signal collecting plate;

and the other signal line is arranged along the symmetrical axis of the side parts of the first signal acquisition board and the third signal acquisition board.

28. The electromagnetic flowmeter of claim 20 wherein said signal wires are provided with reinforcing plates on both sides.

29. The electromagnetic flow meter of claim 20, wherein the main circuit board is further provided with an external interface for electrical connection with an external device to enable electrical connection of the electromagnetic flow meter with the external device.

30. An agricultural plant protection machine is characterized by comprising a rack, a water tank, a water separator, an electromagnetic flow meter, a pump device and a sprayer, wherein the water tank and the sprayer are mounted on the rack;

wherein the electromagnetic flow meter comprises:

a support;

31. The agricultural plant protection machine of claim 30, wherein the flow passage cross section of the conduit is in regular polygonal rows.

32. The agricultural plant protection machine of claim 30, wherein the first electrode mounting hole is in communication with the flow channel of the conduit, the first electrode being integrally formed within the first electrode mounting hole.

33. The agricultural plant protection machine of claim 32, wherein the first electrode is embedded in the first electrode mounting hole by in-mold injection.

34. The agricultural plant protection machine of claim 30, wherein the two first electrodes are coaxially disposed, and an axial direction of the two first electrodes is perpendicular to an axial direction of the coil assembly.

35. The agricultural plant protection machine of claim 30, wherein the signal acquisition plate is provided with a through hole, and the signal acquisition plate is sleeved at the tail end of the first electrode through the through hole so as to realize the electrical connection between the signal acquisition plate and the first electrode;

36. The agricultural plant protection machine of claim 35, wherein the signal acquisition board is mounted on the tail of the first electrode by fasteners.

37. The agricultural plant protection machine of claim 36, wherein the fasteners include at least one of: threaded fasteners, snaps.

38. The agricultural plant protection machine of claim 30, wherein the signal acquisition board is mounted on the side wall of the pipeline by quick release connections.

39. The agricultural plant protection machine of claim 38, wherein the quick release connection comprises at least one of: threaded fasteners, snaps.

40. The agricultural plant protection machine of claim 30, wherein the electromagnetic flow meter further comprises two second electrodes, the two second electrodes are respectively disposed at two open ends of the pipe, and the two second electrodes are disposed at two sides of one of the first electrodes, and the heads of the two second electrodes can be contacted with the liquid flowing through the pipe after respectively passing through the side walls of the pipe;

41. The agricultural plant protection machine of claim 40, wherein the second electrode mounting hole is in communication with the flow channel of the conduit, the second electrode being integrally formed within the second electrode mounting hole.

42. The agricultural plant protection machine of claim 41, wherein the second electrode is embedded in the second electrode mounting hole by in-mold injection.

43. The agricultural plant protection machine of claim 40, wherein a grounding hole is formed in the position of the signal acquisition plate corresponding to the second electrode, and the tail of the second electrode is matched with the grounding hole to realize grounding of the second electrode.

44. The agricultural plant protection machine of claim 30, wherein the coil assembly comprises an iron core, a coil frame sleeved on the iron core, and a coil wound on the coil frame;

the coil rack is fixedly connected with the outer side wall of the pipeline.

45. The agricultural plant protection machine of claim 30, wherein said conduits and said measuring electrodes each comprise a plurality of said conduits arranged substantially in parallel, said plurality of measuring electrodes being correspondingly engaged with said plurality of conduits, first electrodes of said plurality of measuring electrodes being oppositely arranged in two rows;

46. An agricultural plant protection machine according to claim 45, wherein the number of conduits includes four, and the number of coil assemblies includes two, one coil assembly being disposed between two adjacent conduits of one of the sets, and the other coil assembly being disposed between two adjacent conduits of the other set.

47. The agricultural plant protection machine of claim 46, wherein the two coil assemblies are coaxially disposed.

48. The agricultural plant protection machine of claim 45, wherein four signal acquisition plates corresponding to a row of first electrodes are integrally formed to form a first signal acquisition plate;

49. The agricultural plant protection machine of claim 48, wherein the electromagnetic flow meter further comprises a main circuit board and two parallel signal lines;

50. The agricultural plant protection machine of claim 49, wherein the signal wires are arranged in a direction intersecting the axis of the coil assembly and are disposed around the outside of the four pipes.

51. An agricultural plant protection machine according to claim 50, wherein a shock absorbing structure is provided between the signal line and the conduit.

52. The agricultural plant protection machine of claim 51, wherein the shock absorbing structure comprises shock absorbing foam.

53. An agricultural plant protection machine according to claim 49 or 50, wherein the signal line is disposed substantially perpendicular to the direction of extension of the pipe.

54. An agricultural plant protection machine according to claim 49 or claim 50, wherein two first electrodes per said measuring electrode are coaxially arranged, and the central axis of said signal wire is arranged coplanar with the central axis of said first electrodes.

55. An agricultural plant protection machine according to claim 49 or 50, 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 pipeline.

56. An agricultural plant protection machine according to claim 49 or 50, wherein the first signal acquisition board, the second signal acquisition board and the third signal acquisition board are square, wherein one of the signal lines is arranged along a symmetry axis of the side portions of the first signal acquisition board and the second signal acquisition board;

57. An agricultural plant protection machine according to claim 49, wherein reinforcing plates are provided on both sides of the signal line.

58. The agricultural plant protection machine of claim 49, wherein the main circuit board is further provided with an external interface for electrical connection with an external device to enable electrical connection of the electromagnetic flow meter with the external device.