CN214241240U

CN214241240U - Material detection device of sowing machine, sowing machine and plant protection system

Info

Publication number: CN214241240U
Application number: CN202022578191.3U
Authority: CN
Inventors: 吴帆; 颜勋; 马泽豪
Original assignee: SZ DJI Technology Co Ltd
Current assignee: SZ DJI Technology Co Ltd
Priority date: 2020-11-09
Filing date: 2020-11-09
Publication date: 2021-09-21
Anticipated expiration: 2030-11-09
Also published as: WO2022095216A1

Abstract

The application discloses material detection device, machine of scattering and plant protection system of machine of scattering. The material detection device comprises a torque motor, a damping blade and a detection element, wherein the torque motor is provided with a rotating shaft, and the damping blade is fixedly connected with the rotating shaft in a transmission manner. When the torque motor is switched from the locked-rotor state to the started-rotor state, the detection element can detect the state change of the torque motor and send the state change information. When the damping blade is blocked by the material, the torque motor is in a locked-rotor state; when the damping blade rotates, the torque motor is in a starting state. The sowing machine adopts the material detection device of the sowing machine in any embodiment, can accurately judge whether the plant seeds in the bin exist or not by detecting the state of the torque motor, and has high detection reaction speed and small time delay. The plant protection system adopts the sowing machine, which is beneficial to improving the sowing quality.

Description

Material detection device of sowing machine, sowing machine and plant protection system

Technical Field

The application relates to the technical field of planting, especially relates to a material detection device of a sowing machine, the sowing machine and a plant protection system.

Background

As the use of unmanned aerial vehicles in agriculture has become more sophisticated, more and more farms and the like have begun to use unmanned aerial vehicles for plant protection operations. Plant protection operation can involve the seeding operation, needs to carry out the storage of plant seed and broadcast through the machine of scattering. Due to the large operation area and the limited cruising ability of the unmanned aerial vehicle, the unmanned aerial vehicle is required to be used for sowing repeatedly when sowing operation is carried out.

Because the plant seeds are of various types, and have different densities, sizes and shapes, the application of the traditional solid material detection technology to the sowing machine cannot timely and accurately judge whether the plant seeds completely flow out from the outlet of the material box, and the sowing quality is not favorably improved.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a material monitoring device of machine of scattering, machine of scattering and agricultural unmanned vehicles, can improve the quality of agricultural unmanned vehicles operation of scattering.

The technical scheme is as follows:

in a first aspect, the application provides a material detection device of a sowing machine, which comprises a torque motor, a damping blade and a detection element, wherein the torque motor is provided with a rotating shaft, and the damping blade is in fixed transmission connection with the rotating shaft. When the torque motor is switched from the locked-rotor state to the started-rotor state, the detection element can detect the state change of the torque motor and send the state change information. When the damping blade is blocked by the material, the torque motor is in a locked-rotor state; when the damping blade rotates, the torque motor is in a starting state.

When the material detection device of the sowing machine is used, the damping blades are arranged at the outlet of the material box. When the material is stored in the bin, the damping blade is surrounded by the material and cannot rotate, namely, the damping blade is blocked by the material. At the moment, the starting torque motor is also in a locked-rotor state; when the outlet of the bin is opened, the materials gradually flow outwards, and the damping blades are still surrounded by the materials and cannot rotate. When the material of the material box flows out from the outlet, the damping blade is not blocked by the material, so that the resistance borne by the torque motor is reduced, and the torque generated by the torque motor in a locked-rotor state can drive the damping blade to rotate, so that the torque motor can be started; and the torque motor is switched from a locked-rotor state to a started-rotor state, the state of the torque motor changes, such as the current, the voltage or the rotating speed of the torque motor changes, the state change is detected by using the detection element, the state change information can be sent to the corresponding control element, and the control element can indirectly know that the material has completely flowed from the outlet of the feed box according to the state change information. The judging process is accurate in detection, high in speed and small in time delay, and the unmanned aerial vehicle controller can conveniently obtain the information that the material is used up in time.

The technical solution is further explained below:

in one embodiment, the damping blade comprises at least two blades which are uniformly arranged along the same circumference at intervals, and an avoidance space is arranged between every two adjacent blades; the blade is equipped with first lateral wall, and first lateral wall and pivot interval set up, and with the whereabouts direction syntropy setting of material.

In one embodiment, the blade is provided with a first inclined surface which is arranged above the first side wall, and the first inclined surface is inclined downwards towards the falling direction of the material.

In one embodiment, the blade comprises a first body and a second body, one end of the first body is connected with the rotating shaft, the other end of the first body is connected with the second body, and the second body and the first body are arranged in an intersecting mode.

In one embodiment, the second body is perpendicular to the first body, one end of the second body is disposed below the first body, and one end of the second body is disposed with a third body protruding toward the axial direction of the rotating shaft.

In one embodiment, the first body and the third body are provided with a second inclined surface, and the second inclined surface inclines downwards towards the falling direction of the materials.

In one embodiment, the output torque of the torque motor during starting is adjustable; and/or the size of the rotating diameter of the damping vane is adjustable.

In one embodiment, the detection element is a voltage detection element for detecting a voltage change of the torque motor; or the detection element is a current detection element and is used for detecting the current change of the torque motor; or the detection element is used for detecting whether the rotating shaft rotates or not so as to obtain the change of the rotating speed of the torque motor; or the detection element is a rotating speed detection element and is used for detecting the rotating speed change of the torque motor.

In a second aspect, the present application further provides a spreader, including workbin, valve unit and as above-mentioned arbitrary material detection device of spreader, the workbin is equipped with the export, and valve unit is including opening and closing the valve of export, and the damping leaf sets up in the top of export.

When the sowing machine is used, the detection element is in communication connection with the controller of the unmanned aerial vehicle, the plant seeds are stored through the bin, the damping leaves are surrounded by the plant seeds and cannot rotate, and the damping leaves are blocked by the materials. At this time, the starting torque motor is also in a locked-rotor state. The valve is actuated to open the outlet of the bin, the plant seeds gradually flow outwards, and the damping leaves are still surrounded by the plant seeds and cannot rotate. When the plant seeds in the bin flow out from the outlet, the damping blades are not blocked by the material, so that the resistance borne by the torque motor is reduced, and the torque generated by the torque motor in a locked-rotor state can drive the damping blades to rotate, so that the torque motor can be started; and the torque motor is switched from a locked-rotor state to a started-rotor state, the state of the torque motor changes, such as the current, the voltage or the rotating speed of the torque motor changes, the state change is detected by using the detection element, the state change information can be sent to a corresponding controller, and the controller can indirectly know that the plant seeds completely flow out of the outlet of the bin according to the state change information. Therefore, the material detection device of the sowing machine in any embodiment is adopted by the sowing machine, the existence or nonexistence of the plant seeds in the material box can be accurately judged by detecting the state of the torque motor, the detection reaction speed is high, the time delay is small, the controller of the unmanned aerial vehicle can conveniently obtain the plant seed use-up information in time, and the sowing quality is favorably improved.

The technical solution is further explained below:

in one embodiment the bin is provided with a mounting unit for mounting the material detection device of the spreader, the mounting unit being provided with a material discharge opening.

In a third aspect, the present application further provides a plant protection system, which includes an unmanned aerial vehicle and a sowing machine as in any of the above embodiments, wherein the unmanned aerial vehicle can carry the sowing machine to perform sowing operation, and a controller of the unmanned aerial vehicle is in communication connection with the detection element and the valve unit.

When this plant protection system sows the operation, carry the machine of scattering through unmanned vehicles and fly to the seeding region, then control valve unit action through unmanned vehicles's controller for the export is opened and can be sowed in the soil of unmanned vehicles' flight orbit below. When the detecting element detects that the current, the voltage or the rotating speed of the torque motor can change, the related detection information is sent to the controller, and the controller knows that the plant seeds in the bin are used up according to the information and records the sowing position. And controlling the unmanned aerial vehicle to return, supplementing plant seeds to the material box for sowing operation, and starting sowing from the recorded sowing position. So, be favorable to guaranteeing the seeding quality between the adjacent twice seeding region, and then can improve unmanned vehicles and carry out the seeding quality of seeding operation.

Drawings

Fig. 1 is a schematic structural diagram of a seeding machine in an embodiment.

Fig. 2 is a schematic view of the material detecting apparatus shown in fig. 1.

Fig. 3 is a schematic view of the mounting unit shown in fig. 1.

FIG. 4 is a top view of a damper blade according to one embodiment.

Fig. 5 is a schematic view of a material detection device shown in an embodiment.

Fig. 6 is a schematic view of a material detection device shown in an embodiment.

FIG. 7 is a partial structural view of a blade shown in one embodiment.

Description of the reference numerals

10. A material detection device; 20. a material box; 22. an outlet; 24. a mounting unit; 24a, a material leakage hole; 30. a valve unit; 32. a valve; 40. a sowing unit; 100. a torque motor; 110. a rotating shaft; 200. a damping blade; 210. a blade; 211. a first side wall; 212. a first inclined surface; 213. a first body; 214. A second body; 215. a third body; 216. a second inclined surface; 220. avoiding a space; 300. a detection element.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

As the application of unmanned aerial vehicles to agriculture is becoming more mature, more and more farms, forest farms, pastures, or the like start to use unmanned aerial vehicles for plant protection work. When the unmanned aerial vehicle is used for seeding operation, if the operation area is large, the endurance time of the unmanned aerial vehicle is limited, and the weight of the carried plant seeds is also limited, so that the unmanned aerial vehicle can complete seeding in a large area only by repeatedly replenishing the plant seeds and charging. However, due to the various types of plant seeds and the defects of the traditional solid material detection technology, the judgment of whether the plant seeds in the material box exist is not accurate or timely enough, and the sowing quality is difficult to ensure. Meanwhile, when the weight detection element is used for judging whether the plant seeds in the bin exist or not, the ascending or descending or shaking of the unmanned aerial vehicle can influence the detection result, so that the accurate judgment is difficult.

Based on this, it is necessary to provide a material detection device of machine of scattering, improves the detection accuracy and the detection speed that whether plant seed has judged, and the controller of the unmanned vehicles of being convenient for in time obtains plant seed and runs out information, is favorable to improving seeding quality.

For a better understanding of the material detection device of the spreader of the present application, a spreader to which the material detection device of the spreader is applied is described.

As shown in fig. 1 and 2, in one embodiment, there is also provided a spreader comprising a spreader material detection device 10, a bin 20 and a valve unit 30. The material detection device 10 of the sowing machine comprises a torque motor 100, a damping blade 200 and a detection element 300, wherein the torque motor 100 is provided with a rotating shaft 110, and the damping blade 200 is fixedly connected with the rotating shaft 110 in a transmission manner. When the torque motor 100 is switched from the locked state to the unlocked state, the detection element 300 can detect a change in the state of the torque motor 100 and transmit the change-in-state information. When the damping blade 200 is blocked by the material, the torque motor 100 is in a locked-rotor state; when the damping vane 200 rotates, the torque motor 100 is in a starting state.

When the sowing machine is used, the detection element 300 is in communication connection with the controller of the unmanned aerial vehicle, plant seeds are stored through the bin 20, the damping leaves 200 are surrounded by the plant seeds, and the starting torque motor 100 is in a locked-rotor state at the moment. The valve 32 is actuated to open the outlet 22 of the bin 20, the plant seeds gradually flow outwards, and the damping leaves 200 are still surrounded by the plant seeds and cannot rotate. When the plant seeds in the bin 20 completely flow out from the outlet 22, the damping leaves 200 are not blocked by the plant seeds, so that the resistance borne by the torque motor 100 is reduced to be capable of starting; when the torque motor 100 is switched from the locked state to the unlocked state, the current, voltage or rotation speed thereof will change, and the change is detected by the detecting element 300, and the state change information can be sent to the corresponding controller, and the controller can indirectly know that the plant seeds have run out from the outlet 22 of the bin 20 according to the state change information. Therefore, the material detection device 10 of the sowing machine in any embodiment is adopted by the sowing machine, the existence or nonexistence of the plant seeds in the material box 20 can be accurately judged by detecting the state of the torque motor 100, the detection reaction speed is high, the time delay is small, the controller of the unmanned aerial vehicle can conveniently obtain the plant seed use-up information in time, and the sowing quality is improved.

The "state change of the torque motor 100" includes, but is not limited to, a current change, a voltage change, a rotation speed change, and the like of the torque motor 100.

The state change information may be implemented by means of an electrical signal, a digital signal, or the like. The specific characteristics may be determined according to the characteristics of the detecting element 300.

For example, the sensing element 300 can generate electromagnetic excitation according to the current variation to form an electromagnetic signal. Thus, the control unit can indirectly obtain the variation condition of the torque motor 100 according to the electromagnetic signal, and further can indirectly know the plant seeds in the bin 20.

"torque motor 100" includes, but is not limited to, dc torque motor 100, ac torque motor 100, brushless dc torque motor 100, and the like.

It should be noted that the specific implementation manner of the "valve unit 30" can be implemented by any structure meeting the use requirement.

On the basis of the above embodiments, as shown in fig. 2 and fig. 4, in an embodiment, the damping vane 200 includes at least two vanes 210 uniformly spaced along the same circumference, and an avoidance space 220 is provided between two adjacent vanes 210; the blade 210 is provided with a first sidewall 211, and the first sidewall 211 is spaced apart from the rotating shaft 110 and is disposed in the same direction as the falling direction of the material. Thus, the material, such as plant seeds, can flow outward through the leaves 210 via the avoiding space 220, which is also convenient for disposing the damping leaves 200 in the plant seed pile. Meanwhile, the first side wall 211 can be abutted against the plant seeds, so that the rotation of the damping leaf 200 needs to overcome a larger resistance; the torque set by the torque motor 100 is constant, so that when there are plant seeds in the bin 20, the damping leaves 200 are blocked, and the torque motor 100 is in a locked-rotor state. Only when the plant seeds flow completely and do not interfere with the damping leaves 200, the torque motor 100 can drive the damping leaves 200 to rotate, and then the rotation is switched to the starting state.

Further, as shown in fig. 5, in an embodiment, the blade 210 is provided with a first inclined surface 212, the first inclined surface 212 is disposed above the first sidewall 211, and the first inclined surface 212 is inclined downward toward the falling direction of the material. Thus, the first inclined surface 212 is beneficial to the materials (such as plant seeds) falling on the first inclined surface 212 to slide downwards more easily, and is beneficial to ensuring the materials to be gathered at the outlet 22, so that the materials in the material box 20 can flow out as much as possible.

Based on any of the above embodiments of the blade 210, as shown in fig. 4 and fig. 6, in an embodiment, the blade 210 includes a first body 213 and a second body 214, one end of the first body 213 is connected to the rotating shaft 110, the other end of the first body 213 is connected to the second body 214, and the second body 214 intersects with the first body 213. As such, the cooperation of the first body 213 and the second body 214 is beneficial to increase the resistance of the blade 210 in the material.

The second body 214 may be disposed above the first body 213, or disposed below the first body 213; of course, the first body 213 may be disposed in the middle of the second body 214. The specific selection can be carried out according to the needs.

In addition to the above embodiments, as shown in fig. 7, in an embodiment, the second body 214 is disposed perpendicular to the first body 213, one end of the second body 214 is disposed below the first body 213, and one end of the second body 214 is disposed with a third body 215 protruding toward the axial direction of the rotating shaft 110. In this way, by providing the third body 215, the detection accuracy can be further improved by being closer to the outlet 22 of the hopper 20. Meanwhile, the second body 214 is connected with the first body 213 and the third body 215, so that an installation space is formed, the stirring mechanism can be installed, and the stirring mechanism is integrated conveniently.

Alternatively, as shown in fig. 7, in an embodiment, the first body 213 and the third body 215 are both provided with a second inclined surface 216, and the second inclined surface 216 is inclined downwards towards the falling direction of the material. In this way, the second inclined surface 216 is provided to facilitate the materials (such as plant seeds) falling on the second inclined surface 216 to slide down more easily, so as to ensure the materials to be gathered at the outlet 22, and the materials in the bin 20 can flow out as much as possible.

On the basis of any of the above embodiments, in an embodiment, the output torque of the torque motor 100 during starting and rotating is adjustable. When a user uses the damping blade 200, the resistance of the damping blade changes when the motor is aged, equipment is corroded and rusted, and liquid and dust are excessively accumulated; the output torque of the torque motor 100 during starting can be adjusted, so that the torque motor can adapt to the detection requirements of various materials, equipment states and materials in different environments, and is favorable for ensuring the reliability of the detection of the materials.

Specifically, when there is no material in the bin 20. And dynamically generating a torque instruction, adjusting the torque instruction to change, and when the torque reaches a certain value, starting the rotation of the motor, wherein the torque at the moment is the static friction force of the whole structure. When the torque is reduced to a certain value, the motor stops rotating, and the torque at the moment is the dynamic friction force of the whole structure. By the method, the magnitude of the dynamic friction force which needs to be overcome when the motor is started is measured, so that the output torque can be set, the output torque is greater than the static friction force, and the calibration is completed.

Alternatively, in one embodiment, the rotational diameter of the damping vane 200 is adjustable in size. Therefore, the rotating diameter of the damping blade 200 can be flexibly adjusted according to the size of the material port, so that the material detection device 10 is better in adaptability.

Specifically, as shown in fig. 4, the spacing between the blades 210 can be limited, and the specific implementation manner can be various, including but not limited to a telescopic connection structure.

Furthermore, in combination with the embodiment of the first body 213, the length of the first body 213 can be adjusted. That is, the first body 213 is a telescopic rod.

Or, in an embodiment, the output torque of the torque motor 100 during starting is adjustable; and the rotating diameter of the damping vane 200 is adjustable in size. In combination with the above analysis, the rotation resistance of the damping vane 200 is changed while adjusting the rotation diameter thereof; thereby synchronously adjusting the output torque of the torque motor 100. Therefore, the adaptability of the physical monitoring unit can be improved, and the detection precision can be ensured.

On the basis of any of the above embodiments, in an embodiment, the detecting element 300 is a voltage detecting element 300, and is used for detecting a voltage change of the torque motor 100. Further, the voltage detection element 300 can detect a voltage change of the torque motor 100, and can transmit change information according to the voltage change.

Alternatively, in one embodiment, the detecting element 300 is a current detecting element 300 for detecting a current change of the torque motor 100. Further, the current detection element 300 can detect a change in the current of the torque motor 100, and can transmit change information according to the change in the current. For example, the corresponding detection signal can be sent to the control element from the current increase, so that the judgment of the existence of the materials is facilitated.

Alternatively, in an embodiment, the detecting element 300 is used to detect whether the rotating shaft 110 rotates, so as to obtain the rotation speed variation of the torque motor 100. Therefore, the change of the rotating speed of the torque motor 100 can be indirectly judged by detecting the motion state of the rotating shaft 110, and related detection signals can also be sent to a control element to judge whether materials exist or not.

Alternatively, in one embodiment, the detecting element 300 is a rotational speed detecting element 300 for detecting the rotational speed variation of the torque motor 100. Further, the change in the rotational speed of the torque motor 100 can be detected by the rotational speed detecting element 300, and change information can be transmitted according to the change in the rotational speed. If the material is changed from '0' to '0', a corresponding detection signal can be sent to the control element, so that the material existence is judged conveniently.

On the basis of any of the above embodiments, as shown in fig. 3, in one embodiment, the bin 20 is provided with a mounting unit 24 for mounting the material detecting device 10 of the spreader, and the mounting unit 24 is provided with a material leaking hole 24 a. In this way, the material detection device 10 can be mounted near the outlet 22 of the bin 20 by the mounting unit 24 to ensure detection accuracy; meanwhile, the material leakage holes 24a are arranged, so that the flowing of the materials is not influenced, and the materials can smoothly flow out of the material outlet.

The "mounting unit 24" may be any mounting structure capable of mounting the material detection device 10, such as a mounting bracket, a mounting seat, or a mounting case.

It should be noted that the "first body 213" may be "a part of the blade 210", that is, the "first body 213" and "the other part of the blade 210, such as the second body 214", are integrally formed; or a separate member that is separable from other parts of the blade 210, such as the second body 214, i.e., the first body 213 can be manufactured separately and then combined with other parts of the blade 210, such as the second body 214, into a single body.

Equivalently, the "body" and the "certain part" can be parts of the corresponding "component", i.e., the "body" and the "certain part" are integrally manufactured with other parts of the "component"; the "part" can be made separately from the "other part" and then combined with the "other part" into a whole. The expressions "a certain body" and "a certain part" in the present application are only one example, and are not intended to limit the scope of the present application for reading convenience, and the technical solutions equivalent to the present application should be understood as being included in the above features and having the same functions.

Furthermore, as shown in fig. 1, the spreader also comprises a spreading unit 40 arranged below the outlet 22. The plant seeds are uniformly sown by the sowing unit 40.

In an embodiment, as shown in fig. 1 and fig. 2, the present application further provides a plant protection system, which includes an unmanned aerial vehicle and a seeding machine as in any of the above embodiments, the unmanned aerial vehicle can carry the seeding machine to perform seeding operation, and a controller of the unmanned aerial vehicle is communicatively connected to the detecting element 300 and the valve unit 30.

When the plant protection system is used for seeding operation, the unmanned aerial vehicle carries the seeding machine to fly to a seeding area, and then the controller of the unmanned aerial vehicle controls the valve unit 30 to act, so that the outlet 22 is opened to seed the land below the flight track of the unmanned aerial vehicle. When the detecting element 300 detects that the current, voltage or rotating speed of the torque motor 100 will change, it sends the relevant detecting information to the controller, and the controller knows that the plant seeds in the bin 20 are used up according to the information and records the sowing position. And controlling the unmanned aerial vehicle to return, supplementing the plant seeds to the material box 20 for sowing operation, and starting sowing from the recorded sowing position. So, be favorable to guaranteeing the seeding quality between the adjacent twice seeding region, and then can improve unmanned vehicles and carry out the seeding quality of seeding operation.

Of course, the application of the sowing machine to sowing is one of the application examples, and the sowing machine is not limited. The sowing machine can also be applied to the sowing operation of other materials (such as solid fertilizer, solid insect repellent and the like), such as the fertilizer sowing operation, the insect repellent operation and the like.

Equivalently, the plant protection system can also be applied to fertilizer application operation, and can improve the uniformity and quality of fertilizer application.

It should be noted that the "torque motor 100" may be one of the components of the module of the "material detecting device 10", that is, the component is assembled together with the other components of the "material detecting unit" to form a whole, so as to facilitate the modular assembly; or can be relatively independent from other components of the material detection unit, and can be separated, namely can be assembled with other components of the material detection unit in the device.

Equivalently, the components included in the unit, the assembly, the mechanism and the device can be flexibly combined, and can be produced in a modularized mode according to actual needs, so that the modularized assembly is convenient. The division of the above-mentioned components in the present application is only one example, which is convenient for reading and is not a limitation to the protection scope of the present application, and the same functions as the above-mentioned components should be understood as equivalent technical solutions in the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to," "disposed on," "secured to," or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Further, when one element is regarded as being fixedly connected with the other element in a transmission manner, the two elements can be detachably connected and also can be fixed in an undetachable manner, power transmission can be achieved, such as sleeving, clamping, integrally-formed fixing, welding and the like, and the traditional technology can achieve the purpose of no encumbrance. When an element is perpendicular or nearly perpendicular to another element, it is desirable that the two elements are perpendicular, but some vertical error may exist due to manufacturing and assembly effects. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application.

Claims

1. A material detection device of a spreader, comprising:

the torque motor is provided with a rotating shaft;

the damping blade is fixedly connected with the rotating shaft in a transmission manner; and

the detection element can detect the state change of the torque motor and send the state change information when the torque motor is switched from a locked-rotor state to a started-rotor state;

when the damping blade is blocked by the material, the torque motor is in the locked-rotor state; when the damping blade rotates, the torque motor is in the starting state.

2. The material detection device of the spreader as recited in claim 1, wherein the damping vane comprises at least two vanes evenly spaced along a same circumference, and an avoiding space is provided between two adjacent vanes; the blade is equipped with first lateral wall, first lateral wall with the pivot interval sets up, and sets up with the whereabouts direction syntropy of material.

3. A material detecting device of a spreader as claimed in claim 2, wherein the blade is provided with a first inclined surface which is disposed above the first side wall and which is inclined downwardly towards a falling direction of the material.

4. The material detecting device of a spreading machine as claimed in claim 2, wherein the blade comprises a first body and a second body, one end of the first body is connected with the rotating shaft, the other end of the first body is connected with the second body, and the second body is intersected with the first body.

5. The material detecting device of the spreading machine as claimed in claim 4, wherein the second body is perpendicular to the first body, one end of the second body is disposed below the first body, and one end of the second body is provided with a third body protruding toward the axial direction of the rotating shaft.

6. A material detection device of a spreader as claimed in claim 5, wherein the first body and the third body are each provided with a second inclined face which is inclined downwardly towards the falling direction of the material.

7. The material detection device of the sowing machine as claimed in claim 1, wherein the output torque of the torque motor during starting is adjustable; and/or the rotating diameter of the damping blade is adjustable.

8. A material detection device of a spreader as claimed in any one of claims 1 to 7, wherein the detection element is a voltage detection element for detecting a voltage change of the torque motor; or the detection element is a current detection element and is used for detecting the current change of the torque motor; or the detection element is used for detecting whether the rotating shaft rotates or not so as to obtain the change of the rotating speed of the torque motor; or the detection element is a rotating speed detection element and is used for detecting the rotating speed change of the torque motor.

9. A spreader comprising a bin provided with an outlet, a valve unit comprising a valve capable of opening and closing the outlet, and a material detection device of the spreader as claimed in any one of claims 1 to 8, the damper being disposed above the outlet.

10. A plant protection system comprising an unmanned aerial vehicle and a seed planter as claimed in claim 9, the unmanned aerial vehicle being capable of carrying the seed planter for planting, and a controller of the unmanned aerial vehicle being in communication with the sensing element and the valve unit.