WO2022088207A1

WO2022088207A1 - Liquid level monitoring device and plant protection unmanned aerial vehicle comprising same

Info

Publication number: WO2022088207A1
Application number: PCT/CN2020/126244
Authority: WO
Inventors: 高廉洁; 田瑜; 任乐乐
Original assignee: 南京拓攻自动驾驶技术研究院有限公司
Priority date: 2020-10-30
Filing date: 2020-11-03
Publication date: 2022-05-05
Also published as: CN112278284A; CN112278284B

Abstract

Disclosed are a liquid level monitoring device and a plant protection unmanned aerial vehicle comprising same, relating to the technical field of unmanned aerial vehicles. The problem that a liquid level monitoring device is fixed mostly in a bonding manner and is not suitable for long-term use is solved. The liquid level monitoring device comprises: a driving wheel, a connecting line, a first magnet, a driven wheel, a floating ball, a second magnet, a third magnet and a Hall angle sensor, wherein the floating ball floats on a liquid level in a chemical box; the second magnet in the floating ball drives the first magnet on the connecting line to move up and down, so as to drive the driving wheel to rotate, and further drives the third magnet on a rotating shaft to rotate; the angle of rotation of the third magnet can be measured by the Hall angle sensor; a change in the length of the connecting line is obtained by means of the conversion of the angle of rotation; and a change in the liquid level in the chemical box is then obtained. The length of the connecting line and the liquid levels corresponding to different heights of the chemical box can be calibrated in advance, such that the corresponding liquid level in the chemical box can be visually obtained.

Description

A liquid level monitoring device and a plant protection drone containing the same

This application claims the priority of the Chinese patent application filed on October 30, 2020 with the application number 202011194585.7 and the invention titled "A liquid level monitoring device and a plant protection drone containing the same", the entire contents of which are Incorporated herein by reference.

technical field

The present application relates to the technical field of unmanned aerial vehicles, and in particular, to a liquid level monitoring device and a plant protection unmanned aerial vehicle containing the same.

Background technique

Plant protection drones realize spraying operations through ground remote control or navigation flight control. In the process of spraying pesticides, a liquid level gauge needs to be used to monitor the amount of liquid in the medicine tank, so as to avoid the repeated back and forth of the drone due to the observation of the liquid in the water tank, reducing unmanned The flight distance of the drone can be saved, the power of the drone can be saved, and the spraying efficiency can be improved. The float type liquid level gauge is composed of a float ball, a rod, etc. When the liquid level of the container changes, the float ball also moves up and down. Due to the magnetic effect, the dry reed of the float ball level gauge is magnetically attracted, and the liquid level is closed. The position is changed into an electrical signal, and the actual position of the liquid is displayed digitally through the display meter. However, the traditional float level gauge has low adaptability, and in addition, it is inconvenient to monitor the remaining amount of medicine in the medicine box as needed. Therefore, in the field of unmanned aerial vehicles, certain modifications have been made to the float level gauge to suit the actual needs.

In the related art, the plant protection drone includes a water tank, a light bar is wound around the outer surface of the water tank, a water filling port is embedded on the top of the water tank, a baffle is welded at the bottom of the water filling port, and connecting rods are slidably embedded on the front and rear sides of the baffle. A funnel is embedded on the top of the water inlet, and electromagnets are fixedly connected to the front and rear sides of the funnel by bolts. A groove is provided on one side of the water tank, and the inner side of the groove is provided with a contact piece and a shrapnel. A second magnet block is embedded. The change of water level is sensed by the sliding rod and the floating ball in the water tank, and the contact piece is attracted by the magnetic block in the floating ball to connect it with the contact piece, so that the light bar on the outside of the water tank is illuminated, and the operator is accurately reminded of the medicine in the water tank according to the light. liquid volume.

However, the related art has the following problems: the light bar on the outside of the water tank is fixed on the outer wall of the medicine box by means of bonding, which is exposed to the outside for a long time and is easy to fall off and damage, and the reliability and service life are not high.

SUMMARY OF THE INVENTION

In view of the above technical problems existing in the prior art, the present application provides a liquid level monitoring device and a plant protection drone containing the same, which solves the problem that the liquid level monitoring device is mostly fixed by bonding and is not suitable for long-term use.

A first aspect of the present application discloses a liquid level monitoring device, comprising: a first fixing plate, a detection box, a driving wheel, a connecting wire, a first magnet, a driven wheel, a floating ball, a second fixing plate, a connecting bar, a third Magnet, third fixing plate, first sensor plate and Hall angle sensor,

A detection box is arranged on the first fixing plate;

The inner side wall of the detection box is provided with a driving wheel and a driven wheel, the driving wheel and the driven wheel are rotatably connected with the detection box, the driving wheel and the driven wheel are connected by a connecting line, and a first magnet is arranged on the connecting line;

A connecting bar is arranged on the second fixing plate, a floating ball is arranged on the connecting bar, and a second magnet is arranged on the floating ball;

The third magnet is arranged on the end face of the rotating shaft of the driving wheel;

The third fixing plate is arranged on the side of the driving wheel away from the detection box, the first sensor plate is arranged at the side of the third fixing plate away from the driving wheel, and the Hall angle sensor is arranged on the first sensor plate.

Optionally, it also includes: quick release device,

The quick release device is arranged on the first fixing plate. The quick release device includes a quick release button, a spring, a first snap ring and a second snap ring. The spring is arranged between the first snap ring and the second snap ring. The snap ring and the second snap ring are sleeved on the quick release button.

Optionally, it also includes: upper limit card and lower limit card,

The upper limit card is arranged on the inner wall of the detection box near the driving wheel side, and the connecting line passes through the upper limit card.

The lower limit card is arranged on the inner wall of the detection box on the side close to the driven wheel, and the connecting wire passes through the lower limit card.

The first magnet is arranged between the upper limit card and the lower limit card.

Optionally, it also includes: a second sensor board, a first Hall sensor switch, and a second Hall sensor switch,

The second sensor board is arranged on the inner side wall of the detection box, the length of the second sensor board is greater than the center distance between the driving wheel and the driven wheel, the second sensor board is provided with a hall sensor switch, and the first hall sensor switch is arranged close to The position of the upper limit card enables the first magnet moving to the position of the upper limit card to be inductive with the first Hall sensor switch,

The second hall sensor switch is arranged close to the lower limit card, so that the first magnet moved to the position of the lower limit card can sense the second hall sensor switch,

Optionally, the mounting bracket, the first mounting plate, the second mounting plate, the threaded rod, the first motor, the fourth fixing plate, the second motor and the rubber ring,

The mounting bracket is arranged on the upper end of the inner side wall of the detection box, and is arranged on the side of the second sensor board away from the connecting wire,

The upper end of the mounting bracket is provided with a first mounting plate, the lower end is provided with a second mounting plate, and the second mounting plate is provided with a first motor,

The threaded rod is rotatably connected to the first mounting plate and the second mounting plate, and is connected to the first motor,

A second motor is arranged on the fourth fixing plate, a rubber ring is arranged on the second motor, and the rubber ring is arranged just below the driving wheel,

One end of the fourth fixing plate away from the second motor is provided with first mounting ears and bolts, and the bolts are matched with the threaded grooves of the threaded rods,

The threaded rod and the fourth fixing plate are connected through the first mounting ears, and the bolt is in the threaded groove of the threaded rod.

Optionally, it further includes: a fourth magnet, a third Hall sensor switch and a fourth Hall sensor switch,

The fourth magnet is arranged on the fourth fixing plate, between the bolt and the second motor,

The third hall sensor switch and the fourth hall sensor switch are arranged on the second sensor board, the third hall sensor switch is arranged on the side close to the first mounting plate, and the fourth hall sensor switch is arranged near the second mounting plate side of the board.

Optionally, it also includes: a positioning shaft and a second mounting ear,

One end of the positioning shaft is connected with the first mounting plate, and the other end is connected with the second mounting plate,

The second installation ear is arranged on the fourth fixing plate, and the positioning shaft is matched with the second installation ear hole shaft.

Optionally, the Hall angle sensor, the first Hall sensor switch, the second Hall sensor switch, the third Hall sensor switch and the fourth Hall sensor switch, the first motor and the second motor are flying with the drone The controller is electrically connected.

Optionally, the inner side wall of the detection box is provided with a first boss and a second boss, the first boss is set at the upper end of the detection box, the second boss is set at the lower end of the detection box, and the driving wheel is connected to the first boss. The hole shaft is matched, and the driven wheel is matched with the hole shaft of the second boss;

The side of the driving wheel away from the first boss is provided with a shaft sleeve and a rotating shaft, the shaft sleeve is arranged in the middle of the driving wheel and the rotating shaft, and the driving wheel, the shaft sleeve and the rotating shaft are coaxially arranged;

The side of the driven wheel away from the second boss is provided with a rotating shaft, and the driven wheel and the rotating shaft are coaxially arranged;

A first fixing column and a second fixing column are arranged on the inner side wall of the detection box.

A second aspect of the present application discloses a plant protection drone, comprising: a drone body and a medicine box, the medicine box is plugged into the body, and the first fixing plate of the liquid level monitoring device is installed on the drone body Above, the second fixing plate of the liquid level monitoring device is arranged on the inner wall of the medicine box, and the detection box is located outside the medicine box and is close to the inner wall of the medicine box on which the second fixing plate is fixed.

The liquid level monitoring device disclosed in this application includes: a first fixing plate, a detection box, a driving wheel, a connecting wire, a first magnet, a driven wheel, a second fixing plate, a floating ball, a second magnet, a connecting bar, a third magnet, The third fixed plate, the first sensor plate and the Hall angle sensor, the floating ball floats on the liquid surface in the medicine box, and the second magnet in the floating ball drives the first magnet on the connecting line to move up and down, thereby driving the driving wheel to rotate, Then, the third magnet on the rotating shaft is driven to rotate, and the angle rotated by the third magnet can be measured by the Hall angle sensor, and the change of the length of the connecting line can be obtained through the conversion of the angle of rotation, and then the change of the liquid level in the medicine box can be obtained. The liquid level corresponding to the length of the connecting line and the different heights of the medicine box can be calibrated in advance, and the corresponding liquid level in the medicine box can be obtained through the change of the length of the connecting line. For the plug-in medicine box, in some embodiments, the magnet on the fixing member in the detection box can be returned to the lower limit card, which is convenient for the next measurement. The liquid level detection device shown in this application is suitable for different medicine boxes without changing the structure of the medicine box; it is easy to assemble and disassemble, the detection box can be quickly disassembled from the drone, and it can detect the liquid levels of various heights in the medicine box, which is safe and reliable. Not easy to fall off.

Description of drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings used in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, which are of great significance to the art. For those of ordinary skill, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic structural diagram of an embodiment of a liquid level monitoring device provided by the application;

2 is a schematic structural diagram of an embodiment of a liquid level monitoring device and a plant protection drone containing the same provided by the application;

Fig. 3 is the structural representation of the quick release button provided by this application;

4 is a schematic structural diagram of an embodiment of the interior of the detection box provided by the application;

5 is a schematic structural diagram of another embodiment inside the detection box provided by the application;

6 is a schematic diagram of the internal structure of the medicine box provided by the application;

7 is a structural cross-sectional view of the medicine box provided by the application;

8 is a schematic structural diagram of the reset device of the first magnet provided by the application;

Fig. 9 is the structural disassembly schematic diagram of the internal parts of the detection box provided by the application;

10 is a sectional view of the structure at the upper driving wheel provided by the application;

FIG. 11 is a schematic structural diagram of another embodiment of the interior of the detection box provided by the application.

1- the first fixing plate; 2- detection box, 201- the first boss, 202- the second boss, 203- the first fixing column, 204- the second fixing column; 3- driving wheel, 301- bushing, 302-rotating shaft; 4-connecting wire; 5-first magnet; 6-driven wheel, 601-rotating shaft; 7-floating ball; 8-second fixing plate; 9-connecting bar, 901-second magnet; 10-first Three magnets; 11-third fixing plate; 12-first sensor plate; 13-Hall angle sensor; 14-quick release device, 141-quick release button, 142-spring, 143-first snap ring, 144-first Two snap rings; 15-upper limit card; 16-lower limit card; 17-second sensor board; 18-first hall sensor switch, 19-second hall sensor switch; 20-installation bracket; 21-first Mounting plate, 22-second mounting plate; 23-threaded rod; 24-first motor; 25-fourth fixing plate, 251-first mounting ear, 252-bolt; 26-second motor; 27-rubber ring; 28- fourth magnet; 29- third hall sensor switch, 30- fourth hall sensor switch; 31- positioning shaft; 32- second mounting ear; 33- drone body; 34- medicine box.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, and to make the above-mentioned purposes, features and advantages of the embodiments of the present application more clearly understood, the following describes the technical solutions in the embodiments of the present application with reference to the accompanying drawings. plan in detail.

The following first describes the embodiment of the liquid level detection device provided by the present application and the plant protection drone containing the same. The liquid level detection device provided by the embodiment of the present application can be applied to a plant protection drone, or other liquid level detection. system.

The application provides a liquid level detection device and a plant protection drone containing the same, as shown in Figures 1, 2 and 3, the liquid level detection device includes two parts, one part is installed on the drone, and includes a first fixing plate 1 and the detection box 2, the first fixing plate 1 is fixed on the fuselage of the drone, the detection box 2 is fast-released on the first fixing plate 1, and the first fixing plate 1 is provided with a quick-release groove, and the detection The box 2 is slidably connected in the quick release slot, the bottom of the detection box is provided with a quick release button 141, the quick release button 141 is sleeved with a spring 142, and the spring 142 is located between the first snap ring 143 and the second snap ring 144. The release button 141 prevents the detection box 2 from falling down and out of the quick release slot. It should be noted that the above description is only a specific implementation manner, and the present application does not limit the number of detection boxes and the fixing manner of the detection boxes.

As shown in Figures 4 and 5, in an implementation manner, a driving wheel 3 and a driven wheel 6 are fixed in the detection box, and the driving wheel 3 and the driven wheel 6 are driven by a connecting wire 4, and a first magnet is fixed on the connecting wire 4 5. The first magnet 5 can be fixed on the connecting wire 4 through a fixing piece, and the first magnet 5 can be embedded on the fixing piece.

The other part of the liquid level detection device is installed on the medicine box 34, as shown in FIG. , a floating ball 7 is fixed on the connecting bar 9, and there is a second magnet 901 on the floating ball 7. The liquid level in the medicine box 34 drives the floating ball 7 to move, and there is a second magnet 901 on the floating ball 7 to move with it.

It can be seen from the structure of the above-mentioned liquid level detection device that the moving second magnet 901 will drive the first magnet 5 in the detection box to move. Since the first magnet 5 is fixed on the connecting wire 4, the connecting wire 4 will move accordingly, thereby The driving wheel 3 is driven to rotate, and the driving wheel 3 drives the driven wheel 6 to rotate. A third magnet 10 is fixed on the end face of the rotating shaft on the driving wheel 3, and also includes a third fixing plate 11 and a first sensor plate 12. The third fixing plate 11 is supported and fixed by three fixing columns 203 fixed on the inner wall of the detection box. A sensor board 12 is stacked above the third fixed board 11 with a certain gap between the two boards. The first sensor board 12 is provided with a Hall angle sensor 13, and the Hall angle sensor 13 can measure the rotation of the driving wheel 3 by the Hall angle sensor 13. The moving distance of the first magnet 5 is obtained through the angle of rotation, and then the change of the liquid level is obtained.

The way to convert the rotation angle into the moving distance is as follows: In the angle system, because the arc length corresponding to the central angle θ of 360° is equal to the circumference (the radius of the circle is r), the arc length L corresponding to the central angle is:

In the radian system, if the central angle subtended by the arc is θ, there is a formula:

L=θr

The liquid level corresponding to the length of the connecting line 4 and the different heights of the medicine box 34 can be calibrated in advance, and the corresponding liquid level in the medicine box 34 can be obtained by changing the length of the connecting line 4 . Pre-calibration means that, before using the medicine box 34, the first magnet 5 is located at the lower limit card 16, first inject different volumes of medicine into the medicine box 34, and record the volume of the medicine injected each time and the Hall angle sensor 13. According to the obtained angle, the moving distance of the first magnet 5 can be known, and the length of the connecting line corresponds to the volume of the liquid medicine. In normal use, whenever the length of the connecting line is obtained, the volume of the medicinal liquid corresponding to the length of the connecting line can be obtained, that is, the liquid level in the medicine box 34 , and the liquid level actually refers to the volume of the remaining medicinal liquid in the medicine box 34 . It should be noted that the above description is only a specific implementation manner, and the present application does not limit the calculation method for the conversion relationship between the connection line and the position of the medicinal liquid in the medicine box.

The limiting device of the first magnet in the foregoing embodiment will be described below with reference to the accompanying drawings. As shown in Figures 4 and 5, the driving wheel 3 and the driven wheel 6 are respectively provided with an upper limit card 15 and a lower limit card 16 to limit the upper and lower positions of the first magnet 5 to move. In addition, the inner wall of the detection box 2 is provided with a second sensor The upper and lower ends of the board 17 and the second sensor board 17 are provided with a first hall sensor switch 18 and a second hall sensor switch 19, the hall sensor switch The first hall sensor switch 18 and the second hall sensor switch 19 correspond to the upper limit The positions of the card 15 and the lower limit card 16 are used to sense the first magnet 5 reaching the upper and lower positions.

The first Hall sensor switch 18 and the second Hall sensor switch 19 correspond to the upper limit card 15 and the lower limit card 16 , and are used to sense that the first magnet 5 reaches the upper and lower positions. If the medicine box 34 is installed on the drone fuselage 33 in a plug-in type, the first magnet 5 in the detection box 2 will float with the ball 7 in the medicine box 34 during the process of pulling the medicine box 34 upward from the fuselage. Moving up to the upper limit card 15, the Hall sensor switch 19 at the upper limit card 15 can sense the position information and send it to the flight controller. Before the next installation, the magnet located at the upper limit card 15 needs to be returned to the lower limit card 16. The first hall sensor switch 18 and the second hall sensor switch 19 are used to sense the position, and there is no first hall sensor switch. Hall sensor switch 18 and second Hall sensor switch 19, the flight controller cannot know whether the upper and lower limit positions have been reached.

The manual reset method of the first magnet in the foregoing embodiment will be described below with reference to the accompanying drawings. Some medicine boxes 34 are installed on the fuselage of the drone in a plug-in manner. When the medicine box 34 is pulled out, the first magnet 5 in the detection box 2 will follow the floating ball 7 in the medicine box 34 upward. Move to the upper and upper limit card 15. For the next liquid level measurement, the magnet needs to return to the lower limit card 16.

Another magnet can be arranged on the detection box 2 , and when the above adjustment is required, the operator can hold the magnet to attract the first magnet 5 to the lower limit card 16 .

The automatic reset method of the first magnet in the foregoing embodiment will be described below with reference to the accompanying drawings.

As shown in Figures 5, 8 and 9, the adopted solution is: a mounting bracket 20 is provided on one side of the second sensor board 17, and both ends of the mounting bracket 20 include a first mounting plate 21 and a second mounting plate 22. A threaded rod 23 is rotatably connected between the plate 21 and the second mounting plate 22, the threaded rod 23 is connected with the first motor 24, the first motor 24 is fixed on one of the mounting plates, and also includes a fourth fixing plate 25, see FIG. 6 , a second motor 26 is fixed on the fourth fixing plate 25, a rubber ring 27 is sleeved on the output shaft of the second motor 26, the second motor 26 rotates, and drives the driving force through the friction between the rubber ring 27 and the driving wheel 3 The wheel 3 moves to send the magnets to the lower and

upper limit cards

15 and 16 .

In order to adjust the distance between the rubber ring 27 on the output shaft of the second motor 26 and the driving wheel 3 to ensure that the rubber ring 27 can drive the driving wheel 3 to move, the first motor 24 drives the threaded rod 23 to move, and the fourth fixing plate 25 passes through The bolts 252 on the threaded rod 23 are clamped into the gap on the threaded rod 23 and fixed on the threaded rod 23. The movement of the threaded rod 23 drives the fourth fixed plate 25 to move linearly on the threaded rod 23. In order to be able to accurately locate, the fourth fixed plate 25 A magnet is provided on the sensor board, and a third Hall sensor switch 29 and a fourth Hall sensor switch 30 are provided at the corresponding positions of the sensor board, which can sense that the fourth fixed board 25 reaches an accurate position. One end of the threaded rod 23 is connected to the first motor 24, and the other end is rotatably connected to the shaft sleeve on the mounting plate. A positioning shaft 31 is provided on one side of the threaded rod 23 , and the fourth fixing plate 25 is sleeved on the positioning shaft 31 . Each sensor and motor are connected to the UAV flight controller and controlled by the flight controller.

Based on the method for resetting the first magnet described in the foregoing embodiments, the present application also provides a mechanical structure of the resetting device for the first magnet. FIG. 8 is a schematic structural diagram of a reset device of the first magnet in a liquid level monitoring device of the present application. As shown in FIG. 8 , the present application provides a specific structure of a reset device for a first magnet in a liquid level detection device, including: a mounting bracket 20 , a first mounting plate 21 , a second mounting plate 22 , a threaded rod 23 , a A motor 24, a fourth fixing plate 25, a second motor 26 and a rubber ring 27, the mounting bracket 20 is arranged on the upper end of the inner side wall of the detection box 2, and is arranged on the side of the second sensor board 17 away from the connecting wire 4, the mounting bracket 20 The upper end is provided with a first mounting plate 21, the lower end is provided with a second mounting plate 22, the second mounting plate 22 is provided with a first motor 24, and the threaded rod 23 is rotatably connected to the first mounting plate 21 and the second mounting plate 22, and is connected with the first mounting plate 21 and the second mounting plate 22. The first motor 24 is connected, the fourth fixing plate 25 is provided with a second motor 26, the second motor 26 is provided with a rubber ring 27, the rubber ring 27 is arranged directly under the driving wheel 3, and the fourth fixing plate 25 is far away from the second motor 26. One end of the motor 26 is provided with a first mounting ear 251 and a bolt 252. The bolt 252 is matched with the threaded groove of the threaded rod 23. The threaded rod 23 and the fourth fixing plate 25 are connected through the first mounting lug 251. The bolt 252 is on the threaded rod 23. in the threaded groove.

Optionally, it also includes: a fourth magnet 28 , a third hall sensor switch 29 and a fourth hall sensor switch 30 , the fourth magnet 28 is arranged on the fourth fixing plate 25 , and is arranged on the bolt 252 and the second motor 26 In between, the third hall sensor switch 29 and the fourth hall sensor switch 30 are arranged on the second sensor board 17, the third hall sensor switch 29 is arranged on the side close to the first mounting plate 21, the fourth hall The sensor switch 30 is provided on the side close to the second mounting plate 22 .

Optionally, it also includes: a positioning shaft 31 and a second mounting ear 32, one end of the positioning shaft 31 is connected to the first mounting plate 21, the other end is connected to the second mounting plate 22, and the second mounting ear 32 is arranged on the fourth fixing plate 25, the positioning shaft 31 is matched with the hole shaft of the second mounting ear 32.

Based on the detection box described in the foregoing embodiments, the present application also provides a connection structure at the upper driving wheel inside the detection box. As shown in FIGS. 10 and 11 , the present application discloses the structure at the driving wheel inside the detection box, including: a first fixing plate 1 , a detection box 2 , a driving wheel 3 , a connecting wire 4 , a first magnet 5 , and a driven wheel 6 , the medicine box 34, the second fixing plate 88, the connecting bar 9, the third magnet 10, the third fixing plate 11, the first sensor plate 12 and the Hall angle sensor 13, the first fixing plate 1 and the detection box 2 are slidingly connected , the inner wall of the detection box 2 is provided with a first boss 201 and a second boss 202, the first boss 201 is set at the upper end of the detection box 2, the second boss 202 is set at the lower end of the detection box 2, the driving wheel 3 It is matched with the hole shaft of the first boss 201, the driven wheel 6 is matched with the hole shaft of the second boss 202, the driving wheel 3 is provided with a shaft sleeve 301 and a rotating shaft 302 on the side away from the first boss 201, and the shaft sleeve 301 is arranged on the driving In the middle of the wheel 3 and the rotating shaft 302, the driving wheel 3, the shaft sleeve 301 and the rotating shaft 302 are arranged coaxially, the side of the driven wheel 6 away from the second boss 202 is provided with a rotating shaft 601, and the driven wheel 6 and the rotating shaft 601 are arranged coaxially. The inner side wall of the box 2 is provided with a first fixing column 203 and a second fixing column 204, the rotating shaft 302 is connected with the first fixing column 203, the rotating shaft 601 is connected with the second fixing column 204, the driving wheel 3 and the driven wheel 6 are connected through the connecting line 4 For connection, the first magnet 5 is arranged on the connecting line 4, the third magnet 10 is arranged in the through hole of the driving wheel 3, the third fixing plate 11 is arranged on the side of the rotating shaft 302 away from the shaft sleeve 301, and is screwed with the rotating shaft 302, A first sensor plate 12 is disposed on the side of the third fixing plate 11 close to the rotating shaft 302 , and a Hall angle sensor 13 is disposed on the first sensor plate 12 , which can be sensed by the Hall angle sensor 13 and the third magnet 10 .

Optionally, the fourth fixing plate 25 , the first mounting ears 251 , the bolts 252 and the second mounting ears 32 are integrally formed. It should be noted that the above description is only a specific implementation manner, and the present application does not limit the molding manner.

The basic principles and main features and advantages of the present invention have been shown and described above. For those skilled in the art, it is obvious that the present application is not limited to the details of the above-mentioned exemplary embodiments, and does not deviate from the spirit or essential characteristics of the present invention. In other cases, the application can be implemented in other specific forms. Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, the scope of the present application being defined by the appended claims rather than the foregoing description, and it is therefore intended that All changes that come within the meaning and range of equivalents are embraced within this application.

In addition, it should be understood that although this specification is described in terms of embodiments, not each embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Similar parts between the embodiments provided in the present application may be referred to each other. The specific embodiments provided above are just a few examples under the general concept of the present application, and do not constitute a limitation on the protection scope of the present application. For those skilled in the art, any other implementations expanded according to the solution of the present application without creative work fall within the protection scope of the present utility.

Claims

A liquid level monitoring device, comprising: a first fixing plate (1), a detection box (2), a driving wheel (3), a connecting wire (4), a first magnet (5), a driven wheel (6), a floating ball (7), the second fixing plate (8), the connecting bar (9), the third magnet (10), the third fixing plate (11), the first sensor plate (12) and the Hall angle sensor (13),

The detection box (2) is arranged on the first fixing plate (1);

The driving wheel (3) and the driven wheel (6) are arranged on the inner side wall of the detection box (2), and the driving wheel (3) and the driven wheel (6) are connected with the detection box (2). ) rotatably connected, the driving wheel (3) and the driven wheel (6) are connected by the connecting wire (4), and the first magnet (5) is arranged on the connecting wire (4);

The connecting bar (9) is provided on the second fixing plate (8), the floating ball (7) is provided on the connecting bar (9), and the floating ball (7) is provided with a second magnet(901);

The third magnet (10) is arranged on the end face of the rotating shaft of the driving wheel (3);

The third fixing plate (11) is arranged on the side of the driving wheel (3) away from the detection box (2), and the first sensor plate (12) is arranged on the third fixing plate (11) The Hall angle sensor (13) is arranged on the first sensor board (12) on the side away from the driving wheel (3).
A liquid level monitoring device according to claim 1, further comprising: a quick release device (14),

The quick release device (14) is arranged on the first fixing plate (1), and the quick release device (14) comprises a quick release button (141), a spring (142), a first snap ring (143) and a A second snap ring (144), the spring (142) is arranged between the first snap ring (143) and the second snap ring (144), the spring (142), the first snap ring (144) The ring (143) and the second snap ring (144) are sleeved on the quick release button (141).
A liquid level monitoring device according to claim 1, further comprising: an upper limit card (15) and a lower limit card (16),

The upper limit card (15) is arranged on the inner wall of the detection box (2) on the side close to the driving wheel (3), and the connecting wire (4) passes through the upper limit card (15);

The lower limit card (16) is arranged on the inner wall of the detection box (2) on the side close to the driven wheel (6), and the connecting wire (4) passes through the lower limit card (16);

The first magnet (5) is arranged between the upper limit card (15) and the lower limit card (16).
A liquid level monitoring device according to claim 3, further comprising: a second sensor board (17), a first Hall sensor switch (18) and a second Hall sensor switch (19),

The second sensor board (17) is arranged on the inner side wall of the detection box (2), and the length of the second sensor board (17) is greater than the length of the driving wheel (3) and the driven wheel (6). Center distance, the second sensor board (17) is provided with the first Hall sensor switch (18) and the second Hall sensor switch (19), the first Hall sensor switch (18) being arranged at a position close to the upper limit card (15), so that the first magnet (5) moved to the position of the upper limit card (15) can sense the first hall sensor switch (18);

The second hall sensor switch (19) is arranged at a position close to the lower limit card (16), so that the first magnet (5) moved to the position of the lower limit card (16) can interact with the lower limit card (16). The second hall sensor switch (19) senses.
The liquid level monitoring device according to claim 4, further comprising: a mounting bracket (20), a first mounting plate (21), a second mounting plate (22), a threaded rod (23), and a first motor (24) , the fourth fixing plate (25), the second motor (26) and the rubber ring ((27)),

The mounting bracket (20) is arranged on the upper end of the inner side wall of the detection box (2), and is arranged on the side of the second sensor board (17) away from the connecting wire (4);

The upper end of the mounting bracket (20) is provided with the first mounting plate (21), the lower end is provided with the second mounting plate (22), and the second mounting plate (22) is provided with the first motor (twenty four);

The threaded rod (23) is rotatably connected to the first mounting plate (21) and the second mounting plate (22), and is connected to the first motor (24);

The fourth fixing plate (25) is provided with the second motor (26), the second motor (26) is provided with the rubber ring (27), and the rubber ring (27) is provided on the Just below the driving wheel (3), the end of the fourth fixing plate (25) away from the second motor (26) is provided with a first mounting ear (251) and a bolt (252), the bolt (252) ) is matched with the thread groove of the threaded rod (23);

The threaded rod (23) and the fourth fixing plate (25) are connected through the first mounting ears (251), and the bolts (252) are in the threaded grooves of the threaded rod (23).
The liquid level monitoring device according to claim 5, further comprising: a fourth magnet (28), a third Hall sensor switch (29) and a fourth Hall sensor switch (30),

The fourth magnet (28) is arranged on the fourth fixing plate (25), and is arranged between the bolt (252) and the second motor (26);

The third hall sensor switch (29) and the fourth hall sensor switch (30) are arranged on the second sensor board (17), and the third hall sensor switch (29) is arranged On the side close to the first mounting plate (21), the fourth hall sensor switch (30) is arranged on the side close to the second mounting plate (22).
The liquid level monitoring device according to claim 5, further comprising: a positioning shaft (31) and a second mounting ear (32),

One end of the positioning shaft (31) is connected with the first mounting plate (21), and the other end is connected with the second mounting plate (22);

The second mounting ears (32) are arranged on the fourth fixing plate (25), and the positioning shafts (31) are matched with the holes of the second mounting ears (32).
The liquid level monitoring device according to claim 6, wherein the Hall angle sensor (13), the first Hall sensor switch (18), the second Hall sensor switch (19), the third Hall sensor The switch (29), the fourth Hall sensor switch (30), the first motor (24) and the second motor (26) are electrically connected to the drone flight controller.
According to the liquid level monitoring device according to claim 1, a first boss (201) and a second boss (202) are provided on the inner side wall of the detection box (2), and the first boss (201) is arranged at the upper end of the detection box (2), the second boss (202) is arranged at the lower end of the detection box (2), the driving wheel (3) and the first boss (201) The hole and shaft are matched, and the driven wheel (6) is matched with the hole and shaft of the second boss (202);

A shaft sleeve (301) and a rotating shaft (302) are provided on the side of the driving wheel (3) away from the first boss (201), and the shaft sleeve (301) is arranged on the driving wheel (3) and the rotating shaft (302). In the middle of the rotating shaft (302), the driving wheel (3), the shaft sleeve (301) and the rotating shaft (302) are coaxially arranged;

A rotating shaft (601) is provided on the side of the driven wheel (6) away from the second boss (202), and the driven wheel (6) and the rotating shaft (601) are arranged coaxially;

A first fixing column (203) and a second fixing column (204) are arranged on the inner side wall of the detection box (2).
A plant protection drone, comprising: a drone body (33) and a medicine box (34), the medicine box (34) being plugged into the body (33), and further including claims 1-9 The liquid level monitoring device described in any one of the above, wherein the first fixed plate (1) of the liquid level monitoring device is arranged on the fuselage (33) of the drone, and the second fixed plate of the liquid level monitoring device The plate (8) is arranged on the inner wall of the medicine box (34), and the detection box (2) is arranged outside the medicine box (34) and close to the inner wall of the medicine box (34) on which the second fixing plate (8) is fixed.