Seed metering detection device, seed metering device and hole sowing machine

Abstract

The utility model discloses a seed-metering detection device, a seed-metering device and a hill-drop planter, and the seed-metering detection device comprises a first detection sensor which is arranged on a shell of the seed-metering device and is positioned at the tail section of an operation path of a pickup part for picking up seeds by a seed-metering disc of the seed-metering device, and a second detection sensor which is arranged on the shell of the seed-metering device and is positioned at the tail section of the operation path of the pickup part, and the second detection sensor is arranged at a seed-metering opening of the seed-metering device. According to the seed metering detection device, the detection accuracy is easy to guarantee.

Description

Technical Field

[0001] This utility model relates to a clock detection device for a seed metering device in a hill-planting seeder, and also to a seed metering device equipped with the clock detection device. Furthermore, this utility model relates to a hill-planting seeder equipped with the seed metering device. Background Technology

[0002] A cave-casting machine, or simply a cave seeder, is a sowing machine that plants seeds in holes at specific row and hole spacings. It is widely used in the cultivation of crops such as corn, peanuts, cotton, sunflowers, and pumpkins. A cave seeder generally includes a frame, a seed chamber mounted on the frame, several seed metering devices arranged horizontally on the frame, and furrow openers and soil-covering and compacting devices located below the frame, each corresponding to one of the seed metering devices. A single cave seeder typically has at least three seed metering devices, which are usually connected to the seed chamber via pipes. Cave seeders are suitable for crops with a relatively small number of plants per acre, but not for crops with a relatively large number of plants per acre, such as wheat, millet, and rice. Considering the biological activity of the seeds and the risk of pests and diseases, the number of seeds sown per hole is generally 1-3. If the expected sowing quantity per hole is only 1 seed, due to the reliability of the seeder, there may be a certain number of missed seeds.

[0003] The seed metering device most commonly used in current seeders is the disc-type seed metering device. This disc-type seed metering device usually includes a roughly circular base and a roughly cylindrical cover. The base is used to install the seed metering device on the frame. A circular seed metering disc is installed inside the base. The seed metering disc is directly mounted on the base via bearings or indirectly via other rotating parts. One side of the seed metering disc forms a cavity between itself and the base or other rotating parts. An air extraction device is connected to the outside of the cavity. The seed metering disc has a circular array of air suction holes, and a perforation (generally called a seed suction hole) or seed suction nozzle is formed on the other side of the seed metering disc.

[0004] The cover is fixedly connected to the base, and a space is formed between the seed metering tray and the bottom plate of the cover. A seed inlet pipe is connected to the outside of the cover, and a seed storage space is formed in a predetermined area on the lower side of the space (the axis of the seed metering device is generally horizontal, that is, the seed metering tray is generally installed vertically). When the rotating seed metering tray passes through the seed storage space, the seed suction hole or seed suction nozzle will suck up a certain number of seeds. However, due to the influence of suction control, such as the speed of the seed suction nozzle when passing through the seed storage space and the density of the seeds in the seed storage area, some seed suction holes or seed suction nozzles may not be able to suck up seeds, or some seeds may fall off prematurely during the operation of the seed metering tray and fail to reach or reach the seed outlet prematurely, which may result in some holes being seedless, i.e., missed sowing.

[0005] If the missed seeding rate is relatively high, such as exceeding 10%, it will seriously affect the crop yield. Therefore, a seed metering detection device is installed on the seed metering device to determine whether the seed metering device needs to be repaired based on the detected missed seeding rate.

[0006] Currently, seed metering detection mostly uses optical sensors installed at the seed metering port of the seed meterer. However, since some impurities may be mixed in with the seeds, or the seeds themselves need to be coated (such as bran), optical sensors are prone to false detections or missed detections.

[0007] Since a single seeder is often equipped with multiple seed metering devices, a current seed metering detection method compares the seeding status detected by all optical sensors on all seed metering devices at the same time with a ± margin. If an optical sensor does not detect a seed, then there is a missed seeding in the corresponding hole at that moment. This detection method has a relatively narrow scope of application, mainly requiring that the seed metering discs of the seed metering devices on the same seeder have exactly the same graduation method and that the crop rows and columns are relatively regular. However, it cannot solve the problem of potential false detections or missed detections when a seed metering device is equipped with only one optical sensor. Utility Model Content

[0008] The purpose of this utility model is to provide a seed metering detection device with easily guaranteed detection accuracy. Another purpose of this utility model is to provide a seed metering device equipped with the seed metering detection device. Yet another purpose of this utility model is to provide a hole-planting seeder equipped with the seed metering device.

[0009] According to a first aspect of the present invention, a seed metering detection device is provided for seed metering detection of a hill-planting seeder, the seed metering detection device comprising:

[0010] The first detection sensor is installed on the housing of the seed meterer and is located at the end of the running path of the seed picking part of the seed meterer's seed picking disc;

[0011] The second detection sensor is installed at the seed outlet of the seed metering device.

[0012] Optionally, the first detection sensor is located behind the second seed-dispelling component corresponding to the end segment.

[0013] Optionally, both the first and second detection sensors are optical sensors. The first detection sensor is included in a first sensor assembly, and the second detection sensor is included in a second sensor assembly. Both the first and second sensor assemblies include a sensor mounting bracket, which includes:

[0014] The support body has a sensor mounting section;

[0015] An air outlet or a group of holes is formed on a support body or disposed on a given pipe body. Accordingly, if disposed on a pipe body, the pipe body is mounted on the support body or is an integral structure with the support body.

[0016] The air outlet or hole group is installed opposite to the sensor at the sensor mounting part.

[0017] Optionally, the support body included in the second sensor assembly is a tube housing structure, one end of the tube housing is an inlet and the other end is an outlet, and the corresponding outlet end constitutes the second detection sensor mounting part;

[0018] The outlet end has a set of mounting positions on each of its opposite sides. The mounting position on one side is used to install the transmitter of the optical sensor, and the mounting position on the other side is used to install the receiver of the optical sensor.

[0019] Optionally, the arrangement of the transmitting end and the receiving end can be either two straight lines or two arcs.

[0020] If there are two arcs arranged, the distance between the two arcs is the farthest.

[0021] If there are two straight lines arranged in a straight line, the two lines are parallel to each other.

[0022] Optionally, if there are two linearly arranged air outlets or hole groups, each corresponds one-to-one with the linear arrangement and is located at one end of the linear arrangement to direct airflow towards the other end of the corresponding linear arrangement; or

[0023] The air outlet or hole group corresponds one-to-one with the mounting position and is located on the side of the mounting position corresponding to the second detection sensor;

[0024] If there are two arc-shaped arrangements, the air outlets or hole groups correspond one-to-one with the mounting positions and are located on the side of the mounting position corresponding to the second detection sensor.

[0025] Optionally, the mounting position has:

[0026] The arc-shaped groove has an axis that is parallel to or consistent with the extension direction of the sensor probe of the second detection sensor.

[0027] A rear mounting bracket, located on the rear side of the sensor probe, is used to mount the sensor probe.

[0028] If the air outlet or hole group corresponds one-to-one with the installation position, the air outlet or hole group is opened at the bottom of the arc-shaped groove.

[0029] If the air outlet or orifice group is located at one end of a straight line, the arc-shaped groove is omitted or a portion of the groove wall is omitted from the end where the air outlet or orifice group is located to expose the head end of the sensor probe.

[0030] Optionally, if the air outlet or hole group is located at one end of a straight arrangement, the air outlet or hole group is located on the corresponding pipe body.

[0031] Optionally, the inlet of the tube shell is formed into a funnel-shaped structure, where the flow cross-section gradually decreases from the inlet to the outlet.

[0032] Optionally, adapted to a first detection sensor, the sensor mounting bracket includes:

[0033] The support arm has a pair of parallel arrangements between the two support arms. The support arm has an airflow channel arranged in the extension direction of the arm body. One end of the support arm has an air outlet and the other end has an air inlet. The air outlet is provided with a mounting position for installing a first detection sensor. The air outlet is located on one side of the mounting position so that the corresponding first detection sensor is exposed to the air outlet.

[0034] Connecting arm, used for connecting two support arms in the middle or at the air inlet end of the support arm.

[0035] Optionally, the side of the two mounting positions that is far apart from each other is a back plate, which is used as a mounting base plate for the first detection sensor, so that the support arm forms a stepped structure at the air outlet end.

[0036] The air outlet is located on the tread surface of the stepped structure.

[0037] Optionally, a guide fin is provided on the kick surface of the stepped structure. The guide fin is located between the first detection sensor and the tread surface, so that part of the airflow blowing directly onto the first detection sensor is deflected toward the probe side of the first detection sensor.

[0038] Optionally, the airflow channel is perpendicular to the probe of the first detection sensor, and the radial extension of the guide fins in the airflow channel is equal to the radius of the airflow channel.

[0039] The angle between the guide fins and the axis of the airflow channel is 30°~60°.

[0040] According to a second aspect of the present invention, a seed metering device is provided, including the seed metering detection device described in the first aspect of the present invention.

[0041] According to a third aspect of the present invention, a hill-seeding machine is provided, including a frame and a plurality of seed metering devices arranged laterally on the frame, as described in the second aspect of the present invention.

[0042] Unlike existing technologies where only one sensor is used to detect seed distribution on a single seed metering device, the seed metering detection device according to this embodiment has two sensors on the seed metering device. One sensor detects the final stage of seed delivery, and the other detects seed discharge. When both sensors detect seeds within a predetermined detection period, sowing is confirmed as normal; otherwise, it is recorded as missed sowing. It should be noted that double confirmation may produce false alarms, but these do not result in actual losses and may only shorten the maintenance cycle. Double confirmation can also reduce another type of false alarm, such as when one sensor detects seeds while the other does not. In this case, it may be a false alarm from one sensor, and treating it as missed sowing will not result in actual losses, but it can reduce the actual missed sowing caused by a single sensor's false alarm, thus improving overall accuracy. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the fit between the cover and the seed metering disc in one embodiment of the seed metering device.

[0044] Figure 2 This is a schematic diagram of the seed metering device structure in one embodiment.

[0045] Figure 3 This is a schematic diagram of the seed metering device housing structure in one embodiment (with a first sensor assembly and a second sensor assembly installed).

[0046] Figure 4 This is another schematic diagram of the seed metering device housing structure in one embodiment (with a first sensor assembly and a second sensor assembly installed).

[0047] Figure 5 This is a schematic diagram of the seed metering device housing structure in one embodiment (without the first and second sensor components installed).

[0048] Figure 6 This is a schematic diagram of the first structure of the sensor mounting bracket in the first embodiment.

[0049] Figure 7 This is a schematic diagram of the second structure of the sensor mounting bracket in the first embodiment.

[0050] Figure 8 This is a schematic diagram of the sensor mounting bracket structure in the second embodiment.

[0051] Figure 9 This is a schematic diagram of the sensor mounting bracket structure in the third embodiment.

[0052] Figure 10 This is a schematic diagram of the main cross-section of the sensor mounting bracket in the fourth embodiment.

[0053] Figure 11This is a schematic diagram of the left-hand structure of the sensor mounting bracket in the fourth embodiment.

[0054] Figure 12 This is a top-section schematic diagram of the sensor mounting bracket in the fourth embodiment.

[0055] Figure 13 This is a three-dimensional structural diagram of the sensor mounting bracket in the fourth embodiment.

[0056] In the picture: 1. Cover, 2. Seed metering tray.

[0057] 11. Seed inlet tube, 12. First seed feeding assembly, 13. Housing, 14. Mounting tube, 15. First sensor assembly, 16. Second seed feeding assembly, 17. Seed outlet assembly, 18. Material blocking brush, 19. Cleaning port assembly.

[0058] 21. Disc body, 22. Positioning and mounting center hole, 23. Seed suction nozzle, 24. Seed suction nozzle seat.

[0059] 131. Enclosure, 132. First through hole, 133. Guide plate, 134. Positioning groove, 135. Second through hole, 136. Positioning port.

[0060] 151. First pipe connector, 152. Airflow channel, 153. Support arm, 154. Sensor mounting hole, 155. Guide fin, 156. First air outlet, 157. Mounting hole, 158. Connecting arm.

[0061] 171. Seed outlet, 172. Pipe connector, 173. First base plate, 174. Seed inlet hopper, 175. Seed inlet, 176. Second base plate, 177. Support platform, 178. Air outlet.

[0062] 191. Cover

[0063] 711. Jet nozzle array.

[0064] 1721. Mesh.

[0065] 1731. Wiring positioning slot.

[0066] 1771. Sensor positioning slot. Detailed Implementation

[0067] Unlike existing technologies, the improvement of the seed metering detection device in the embodiments of this utility model lies in the fact that the seed meterer is equipped with two detection sensors. For other parts of the seed meterer and other parts of the hill-planting machine, except for the relevant parts, existing technologies can be used. Therefore, the embodiments of this utility model focus on describing the two sensors and the configuration and selection of each sensor, and do not describe the other parts of the seed meterer and hill-planting machine in detail.

[0068] In the embodiments of this utility model, the focus is on the description of the structure or construction of the product. As for how the sensor is used, only the content related to the implementation of this utility model is described in the embodiments of this utility model, and other content will not be described in detail.

[0069] The following describes the general configuration of a hill-seeding machine. As mentioned in the background section, a hill-seeding machine generally includes a frame, which can be equipped with independent wheels or mounted on other carriers.

[0070] A seed compartment is mounted on the frame or the carrier on which it is installed. Additionally, several seed metering devices are arranged horizontally on the frame; the number of seed metering devices is generally no less than three, but rarely exceeds ten. When a seed metering machine has too many seed metering devices, its flexibility will be relatively reduced. One seed metering device can correspond one-to-one with a seed compartment, or multiple seed metering devices can share a single seed compartment. The seed compartment and the seed metering devices are generally connected by a seed delivery pipe. Therefore, if... Figure 4 As shown, the seed metering device is generally equipped with a seed inlet tube 11 on its casing 1 for communication with the seed chamber.

[0071] Figure 3 and Figure 5 The illustrated structure is the cover 1 of the seed metering device. In this embodiment of the invention, the cover 1 is a shallow barrel-shaped structure. Its depth only needs to ensure that there is no motion interference between the seed metering disc 2 and the cover 1 when they rotate and pick up seeds. The depth of the cover 1 can vary depending on the type of seed. In other words, the larger the individual seed, the greater the depth of the cover 1 can be. For example, for sunflower seeds, the depth of the cover 1 can be between 20mm and 65mm.

[0072] Regarding the depth of the cover 1, it is existing technology and its design basis is relatively obvious, but different hole seeding machine manufacturers may have their own considerations and design it to have different depths.

[0073] The open end of the cover 1 mates with the base shell of the seed metering device to form the seed metering shell. Figure 1 The seed metering disc 2 shown is located inside the seed metering shell and is generally matched with a rotating seat located inside the seed metering shell. The seat plate of the seat shell generally has a central hole for connecting the drive shaft.

[0074] In addition, a vacuum chamber is formed on the side of the seed metering disc 2 away from the cover 1. The vacuum chamber is generally connected to a vacuum tube connector from the base shell to connect to vacuum equipment, such as a vortex blower.

[0075] Figure 3 and Figure 5The illustrated state of the casing 1 is adapted to the clockwise rotation of the seed metering disc 2. In the figure, the baffle brush 18 and the guide plate 133 inside the casing 1 divide the internal space of the casing 1 into two parts. Due to the constraint of the fit between the seed metering disc 2 and the casing 1, a certain amount of seeds will accumulate after entering the space between the casing 1 and the seed metering disc 2 from the seed inlet tube 11; at the same time, due to the relatively limited fluidity of the seeds, the amount of seeds accumulating in this space is not large. For ease of description, the space used for seed accumulation is referred to as the first space.

[0076] Figure 5 The guide plate 133 shown is an arc-shaped plate, which is generally coaxial with the casing 131 of the cover 1. Its central angle is generally between 50° and 90°. The space between the guide plate 133 and the casing 131 is hereinafter referred to as the second space. The cross-section of the second space perpendicular to the axis of the cover 1 is generally fan-shaped. It should also be noted that the second space is located at the end of the entire journey from seed pickup to discharge, and the central angle of the guide plate 133 determines the main body of the end section. The corresponding initial section is used for seed pickup, and the middle section is used for removing excess seeds.

[0077] The quasi-isolation component between the first space and the second space Figure 5 The illustrated structure uses a baffle brush 18, which is generally a bristle brush. Clearly, when the baffle brush 18 is used to isolate the first space from the second space, it operates in a quasi-isolation state. That is, it prevents seeds from the seed pile in the first space from entering the second space due to gravity, while ensuring that, for example, the seed suction nozzle seat 24 can pass through. It should be understood that the bristle brush also has a certain rigidity, but not much. Under the condition of seed blocking, the seed suction nozzle seat 24, protruding from the seed metering disc 2, can be squeezed through the baffle brush 18.

[0078] The seeds are squeezed through the baffle brush 18, for example, into the seed pile via the seed suction nozzle seat 24. The seed suction nozzles 23 on the seed suction nozzle seat 24 will suck up a certain number of seeds, which will then pass through the seed pile and follow the seed metering disc 2. Figure 3 Rotate clockwise in the illustrated state.

[0079] Since the number of seeds picked up by the seed suction nozzle 23 is uncertain, it is generally necessary to use 3 and Figure 5 The first seed-dispensing component 12 shown in the figure dispenses some of the seeds adsorbed on the seed suction nozzle 23.

[0080] Figure 5 The bottom plate of the middle housing 13 has a first through hole 132 for installing the first seed-dispensing component 12. The first seed-dispensing component 12 is also a common configuration of the seed metering device, and will not be described in detail here.

[0081] The first seed-dispensing component 12 includes a handle located outside the housing 1, which can adjust the deflection angle of a cylindrical or conical spring on the first seed-dispensing component 12 for dispensing seeds according to different types of seeds, so as to dispense excess seeds while avoiding dispensing the intended remaining seeds.

[0082] However, it should also be understood that, in Figure 3 The illustrated structure contains two first seed-dispensing components 12. While controlling the number of seeds adsorbed on the seed suction nozzle 23 to an appropriate level, it is also possible to dispense all the seeds, causing the seeds on a certain seed suction nozzle seat 24 to be dispensed before entering the second space, which may result in a missed seeding problem.

[0083] In addition, if the vacuum tube connector, the connected pipeline, or the vacuum chamber of the seed metering device leaks, it may also cause insufficient suction of the seed suction nozzle 23 on the seed suction nozzle seat 24, or unstable air source vacuum, which may also result in missed seeding.

[0084] For example, contamination of the lens of an infrared sensor may lead to insufficient sensitivity, causing it to register seed passage even when no seeds have passed. Therefore, this invention employs a dual-determination approach to ensure that even if the sensor produces a false detection, the "actual" missed seeding is accurately detected.

[0085] The cover 1 is provided with a cleaning port assembly 19 at the lower end corresponding to the first space. It can generally be configured as a discharge nozzle. The discharge nozzle generally has a threaded head, which is connected to a cap. After sowing is completed, the cap is opened to discharge the remaining seeds.

[0086] In addition, the spacing of the seed metering device is common knowledge in this field and depends on the crop row spacing, so it will not be elaborated here.

[0087] exist Figure 2 In the aforementioned structure, the seed metering disc 2 has twelve seed suction nozzle seats 24, each with two seed suction nozzles 23, primarily suitable for sowing two seeds per hole. Therefore, the seed metering disc 2 can sow twelve holes per rotation, and the sowing cycle per hole is also fixed when the rotation speed of the seed metering disc 2 is constant.

[0088] Generally, the travel speed of the seed planter is positively correlated with the rotation speed of the seed metering disc 2 to ensure a fixed spacing between holes. Therefore, the sowing cycle per hole is fixed relative to the seed planter.

[0089] Furthermore, the starting and ending points of a sowing cycle only need to be determined. Since the cycle length is fixed, it is not important how to choose the starting and ending points of the sowing cycle. This is common knowledge in this field and will not be elaborated here.

[0090] Once the sowing cycle is determined, the time it takes for the seed suction nozzle 23 to reach the position of the first sensor component 15 is also predetermined. Since the seeds are dislodged at the seed outlet component 17, their descent is affected by other factors, such as the direction of dislodging and whether they collide with other physical parts. Therefore, the time it takes for the seeds to reach the second sensor component often has a certain time interval. However, this time interval is usually much shorter than the wavelength of the sowing cycle. A time interval can be defined to ensure that the objects monitored by the first sensor component 15 and the second sensor component are the same set of seeds. This can be easily determined by those skilled in the art through limited experiments and will not be elaborated upon here.

[0091] In addition, the components of the seeder that work in conjunction with the seed metering device also include a furrow opener and a soil covering and compacting device. In most implementations, the furrow opener and soil covering and compacting device correspond one-to-one with the seed metering device. The furrow opener is located in front of the seed metering device and is used to directly form holes or furrows. The soil covering and compacting device is located behind the seed metering device. After the seeds fall into the holes or furrows, the soil covering and compacting device covers the seeds and compacts them appropriately. This is common knowledge in the field and will not be elaborated further here.

[0092] Figure 2 Take, for example, the seed metering disc 2 provided with a seed metering device. The seed metering disc 2 is generally a circular structure. The number of seed suction nozzles 23 or seed suction holes on it is related to the planting density of the plants, which will not be elaborated here.

[0093] In addition, such as Figure 2 The seed suction nozzle seat 24 shown has two seed suction nozzles 23, which are mainly used for the application of sowing two seeds in one hole.

[0094] The first sensor assembly includes a first detection sensor for initial seed confirmation, which is used to detect when the seed is being carried, for example, by a seed suction nozzle 23 or a suction hole.

[0095] exist Figure 3 and Figure 5 In the illustrated structure, the first detection sensor is located within the second space, essentially located within... Figure 3 The second seed-picking component 12 can be placed behind the seed-picking component. Specifically, after removing the excess seeds, the first seed test can be performed.

[0096] Figure 3 The illustrated housing 1 is in Figure 3The state is adapted to the case where the seeding disc 2 rotates clockwise. The first seeding component directly indicated by the label 12 is the first seeding component 12. In some applications, only one first seeding component 12 can be set. When there are two, the seeding direction will be somewhat different. Such configuration is common knowledge in the field and will not be described in detail here.

[0097] In comparison, in the prior art, a seed metering device typically has only one sensor for detecting seeds, and it is usually located at the seed outlet. In the embodiment of this utility model, it is equivalent to adding a sensor location. This added sensor location is mainly in the first space, and its location has been explained in other parts of the embodiment of this utility model, so it will not be repeated here.

[0098] According to the previous definition, after excess seeds are removed, the seed-picking component enters the final stage of the operating path. The operating path of this picking component is divided into stages based on function: seed picking, excess seed removal, and seed detection and removal / dispatch. The detection and removal / dispatch stage is the final stage. This operating path corresponds to the stages when the seed metering disc 2 completes one revolution. Since the seed metering disc 2 rotates continuously, determining the operating path facilitates the determination of each stage, and the fact that the central angles of the three stages are exactly 360° also aids in the overall definition.

[0099] As mentioned above, the second detection sensor is typically located in the conventional position used in existing technologies when only one sensor is installed. Specifically, it is positioned at the seed outlet of the seed metering device. Figure 3 See the seed outlet component 17 shown.

[0100] from Figure 3 As can be seen, although the distance between the second first seed-dispensing component 12 and the seed outlet is relatively far, that is, the entire end section is relatively long, even if there are multiple seed suction nozzles 23 between the setting position of the first detection sensor and the seed outlet, it does not affect the processing of the same detection object of the first detection sensor and the second detection sensor. Those skilled in the art can easily determine this based on the cycle and the step size between the seed suction nozzles 23.

[0101] In contrast, offsetting the first detection sensor as close as possible to the seed dispensing port reduces computational load. In a preferred embodiment, the first detection sensor only needs to be located in front of the second seed-dispensing component 16 used for seed dispensing, i.e., detection precedes dispensing. Correspondingly, the second detection sensor is used to detect the seed dispensing section after the seeds have been dispensed.

[0102] Furthermore, in the embodiments of this utility model, the sensor mounting bracket is used for mounting the optical sensor. Optical sensors are relatively sensitive to light obstruction; therefore, when their probes are contaminated or obstructed by dirt, false detections or missed detections are inevitable. In the embodiments of this utility model, compressed gas is mainly used to clean the probes of the optical sensors. Regarding the use of compressed gas in real-time blowing, periodic pulse impact, or a cleaning method based on the degree of probe contamination, those skilled in the art can adapt it according to the needs of the developed product. How it is adapted is almost unrelated to the product structure or construction of this utility model. However, it is recommended that pulsed airflow be used for probe cleaning whenever possible.

[0103] It should be understood that seed metering devices are often equipped with a negative pressure system, typically provided by a fan. A set of suction nozzles (also called suction ports, seed suction ports, or seed suction nozzles 23) are often arranged in a circular array on the seed metering disc 2 of the seed metering device. When a seed suction nozzle 23 reaches the seed discharge port, it is dislodged from the suction nozzle and enters the seed discharge port. When a seed is on a seed suction nozzle 23, its state is relatively stable, and therefore its position is basically fixed when it reaches the seed discharge port. Thus, a single sensor can be used for detection. However, when a seed is dislodged at the seed discharge port, it falls freely with a relatively random trajectory, often requiring a set of sensors for detection. In the embodiments of this utility model, two types of sensor mounting brackets are provided, one of which is... Figures 6-9 The illustrated sensor mounting bracket is used for mounting a group of sensors; another type is... Figures 10-13 The illustrated sensor mounting bracket is used for mounting a single sensor, and the sensor assembly with a single sensor is configured as follows: Figure 3 The first sensor assembly 15 shown is used to detect relatively simple objects.

[0104] It should be understood that the embodiments of this utility model do not involve the selection of optical sensors, but can be understood as cleaning known optical sensors. Furthermore, regarding cleaning, it is not necessary to clean the entire structure of the optical sensor; the object to be cleaned is more easily determined, based on the purpose of this utility model, to be the lens part of the optical sensor (the light exit window or the light entrance window).

[0105] It should also be known that the optical sensors suitable for seed metering devices mainly include optical sensors with light sources and detectors. The light source is also called the transmitter, and the detector is also called the receiver. In the optical sensors suitable for seed metering devices, the transmitter and receiver are generally set in an aligned manner, and the object being detected passes through the space between the receiver and the transmitter.

[0106] The light source, i.e. the emitting end, often uses light-emitting diodes, laser diodes, infrared emitting diodes, etc. These light sources are focused by optical elements such as lenses or light rays, so that an accurate light path can be determined. The receiving end is precisely placed on the light path. The space that the object being detected passes through is also often traversed by the light path. Thus, for example, when a seed passes through this space, it temporarily blocks the light path, and the receiving end cannot receive the light and sends out a switching signal.

[0107] Receivers are typically equipped with photosensitive elements, such as photoresistors, phototransistors, and photovoltaic cells. In some high-value applications, they can also be configured as image sensors. The compatibility between the receiver and transmitter is common knowledge in this field and will not be elaborated upon here. However, as mentioned earlier, the light emitted from the transmitter is generally output in a relatively narrow beam. Therefore, the probe areas that need to be cleaned, whether at the receiver or transmitter, do not need to be large. In other words, the main part of the probe cleaned using, for example, pulsed airflow is the light output or input, such as the lens section.

[0108] Admittedly, it's always better to clean the rest of the sensor, such as the packaging and wiring, to minimize the impact on heat dissipation. However, this also suggests that when cleaning the probe using, for example, pulsed airflow, the airflow impact does not need to cover a large area.

[0109] Regarding the probe, referred to in this invention as the transmitter and receiver, it generally has a package containing a transparent portion, which includes, for example, the aforementioned lens. This portion is the focus of cleaning, while the rest of the probe does not need to be cleaned.

[0110] The foregoing has clarified that there are two main types of sensor mounting brackets based on embodiments of this utility model, for application in different scenarios. One type can... Figures 6-9 The illustrative structure will be used for explanation, hereinafter referred to as the first type; the other type will be described using... Figures 10-13 The illustrated structure will be explained below, hereinafter referred to as the second type. As can be seen from the previous description, the first type of sensor mounting bracket is mainly used to detect objects passing through in a relatively free manner, while the second type is mainly used to detect objects passing through in a relatively stable manner.

[0111] The first type of sensor mounting bracket will be described below. Figures 6-9 In the illustrated structure, the support body for mounting the sensor is a tubular shell structure. However, it should be understood that for a seed metering device, which has a seed dispensing port, the support body of the tubular shell structure is typically installed at a predetermined position of the seed dispensing port to construct the seed dispensing port. Therefore, it can also be understood that if the seed dispensing port is constructed from the shell of the seed metering device, then the portion of the shell located at the seed dispensing port can constitute the support body.

[0112] As can be seen from the foregoing description, the first type of sensor mounting bracket is used to mount multiple optical sensors. Therefore, the sensor mounting part provided includes multiple sensor mounting positions. The number of sensor mounting positions depends on the size of the seeding port. Obviously, the number of sensors should be sufficient to avoid missed detections as a basic condition, which can be easily determined by those skilled in the art.

[0113] Obviously, since different types of seeds have different sizes, the size requirements for the seed outlet will also vary. Therefore, there is no uniform requirement for the number of sensors, and the corresponding technical requirement is the coverage area of ​​all the aforementioned sensors.

[0114] It should also be understood that in the embodiments of this utility model, the focus is on cleaning the sensor rather than the arrangement of the sensor. In other words, the arrangement of the sensor can be understood here as known technical content.

[0115] also, Figure 6 The second air outlet 178, which is adapted for cleaning, needs to take into account the structure or construction of the bracket itself, as well as the layout of the sensor and other technical conditions. These technical conditions will affect the arrangement of the air outlet. However, it is also understandable that if the entire sensor mounting bracket is designed as a whole with the second air outlet 178 configured, the bracket needs to be adjusted to match the position of the second air outlet 178. Such adjustments indicate that the second air outlet 178 constitutes the design basis of the bracket. In other words, in the embodiments of this utility model, the second air outlet 178 and its associated structure or construction will also cause changes to the bracket.

[0116] exist Figure 7 and Figure 8 In the illustrated structure, the second air outlet 178 is a functional part used for cleaning the probe. Figure 9 In the illustrated structure, the jet hole array 17711 constitutes the functional part for cleaning the probe. For ease of description, the jet hole array 17711 is simply referred to as the hole group, and the hole group and the second air outlet 178 are collectively referred to as the cleaning unit below.

[0117] From a positional perspective, the gas blown out by the cleaning unit should be directed directly at the probe, especially the lens part of the probe used for emitting or receiving light.

[0118] Regarding the configuration of the second air outlet 178 and the hole group in the cleaning unit, it can be directly formed on the support body, such as... Figure 9 The jet hole array 17711 shown can be directly formed when the support body is formed by, for example, injection molding or 3D printing, or it can be configured on a given tube body.

[0119] In addition, the molding process can be as described above, such as injection molding, or holes can be formed after the support body is formed by machining methods such as drilling.

[0120] Regarding the construction of the pipe on the support body, it can be integrally formed with the support body, or it can be a pipe installed on the support body later. These construction methods are common knowledge in the relevant fields and will not be elaborated here.

[0121] In addition, for examples such as having a first air outlet 156 or a second air outlet 178, the support body generally needs to be adapted to a flow channel. The flow channel can be directly connected to an external pipeline, or the flow channel can be adapted to a second pipe connector 172 integrally formed with the support body for connecting to a pipeline.

[0122] In some implementations, the second air outlet 178 is formed on the support body, and the corresponding flow channel is also formed on the support body. The inlet end of the flow channel is tapped to form a threaded hole, which can be directly connected to a threaded joint.

[0123] Regarding the flow channel, it can be a channel or a cavity, such as... Figure 9 The jet hole array 17711 shown can be a cavity or a channel in the part of the support body used to connect the second pipe connector 172. When configured as a channel, the jet hole array 17711 on the same side is connected through the channel.

[0124] exist Figure 9 In the illustrated structure, each of the jet hole arrays 17711 located on both sides is equipped with a second pipe connector 172. In some embodiments, the jet hole arrays 17711 located on both sides may be equipped with only one second pipe connector 172. When only one second pipe connector 172 is provided, the lumen or channel for connecting the jet hole arrays 17711 on the same side is connected to the second pipe connector 172 of that one.

[0125] Figures 6-9 The second pipe connector 172 is mainly used for the inlet of compressed gas. The corresponding seed metering device has a through hole corresponding to the second pipe connector 172. The main body of the support is housed in the seed metering device and is detached from the seed metering disc, but can also be in contact with it and have sliding friction or rolling friction.

[0126] Figures 10-13 The second type of sensor mounting bracket is simpler in structure than the first type of sensor mounting bracket because, as mentioned earlier, the seed metering device generally holds the seeds by suction holes or nozzles. The position of the suction holes or nozzles is fixed. When the seeds are held by the suction holes or nozzles, the axial position of the seeds in the seed metering device is fixed. Therefore, for the second type of sensor mounting bracket, in principle, installing one sensor is sufficient to meet the detection requirements, but the possibility of installing two or more sensors cannot be ruled out.

[0127] Compared to Figures 6-9 The illustrated sensor mounting bracket has a tubular support body. Figures 10-13 The main body of the support structure of the illustrated second type of sensor is roughly U-shaped, but considering the configuration of the first pipe connector 151, it could be H-shaped. Figure 5 In a variation of the illustrated structure, if the two first pipe joints 151 are combined into one, the first pipe joint 151 of the one is simultaneously connected to the two airflow channels 152 shown in the figure through a connecting channel opened on, for example, the connecting arm 158.

[0128] Figures 10-13 The second type of sensor mounting bracket illustrated has a pair of support plates 153 arranged in parallel between the two support plates 153. When the bracket is mounted on the seed metering device, the extension direction of the support plates 153 is parallel to the axis of the seed metering device.

[0129] The second type of sensor mounting bracket is suitable for mounting sensors when seeds are in a state where they are adsorbed by suction holes or nozzles on the seed metering disc. As mentioned earlier, in this state, the seed's trajectory along the axis of the seed metering device is basically determined, making it suitable for detection by a single sensor. The optical path of this single sensor is approximately aligned with the radial direction of the seed metering device or forms an angle of no more than 30°.

[0130] One end of the two support plates 153 is the sensor mounting end, and the other end can introduce airflow. Therefore, the support plate 153 has an airflow channel 152 arranged in the extension direction of the arm body. One end of the support plate 153 has a first air outlet 156, and the other end has an air inlet. Obviously, the first air outlet 156 and the air inlet also constitute the two ends of the airflow channel 152.

[0131] The first pipe connector 151 can be directly formed at the end of the support plate 153 with the air inlet, and the extension direction of the first pipe connector 151 is consistent with the extension direction of the support plate 153. As mentioned above, the two support plates 153 can share a first pipe connector 151, and the corresponding two airflow channels 152 can be connected by a transverse airway (i.e., the aforementioned connecting channel) opened in, for example, the connecting arm 158.

[0132] Figure 10 In the middle, the connecting arm 158 also forms the seat of the support frame, which can be fixed to the housing of the seed metering device by, for example, screws.

[0133] Accordingly, the sensor is installed at the end of the second air outlet 156 of the second type of sensor mounting bracket. At this time, the second air outlet 156 directly faces the sensor probe and is used for cleaning the sensor probe.

[0134] exist Figures 10-13In the illustrated structure, the end of the support plate 153 where the second air outlet 156 is located is provided with a sensor mounting hole 154, and the optical path direction of the installed sensor is perpendicular to the blowing direction of the second air outlet 156.

[0135] For ease of description, in the embodiment where the support body is mainly composed of a support plate 153, in order to distinguish the orientation, the end where the second air outlet 156 is located is called the air outlet end of the support plate 153, or simply the air outlet end, and the other end is called the air inlet end, or simply the air inlet end.

[0136] The first and second type sensor mounting brackets are equipped with a first air outlet 156, a second air outlet 178, or a group of holes. For example, the air blowing direction of the second air outlet 178 or the group of holes is approximately perpendicular to the optical path direction of the sensor, so as to clean the sensor probe and reduce false alarms or missed detections caused by the sensor lens being blocked by dirt.

[0137] The support body of the first type of sensor mounting bracket preferably adopts a tubular shell structure. Figures 6-9 The example structure clearly demonstrates this.

[0138] The support body adopts a tubular shell structure, which can be directly used as the seed outlet of the seed metering device. Figure 6 The diagram shows the approximate installation state of the support body on the seed metering device. Seeds enter through the seed inlet 175 shown in the diagram and exit through the seed outlet 171 shown in the diagram. The upper middle part of the support body shown in the diagram has a bucket-shaped structure, which makes the tube-shell structure of the support body gradually narrow in the upward and downward direction, which facilitates the seeds falling more easily into the predetermined holes.

[0139] Furthermore, due to the constricted opening, the seed outlet 171 shown in the figure is relatively small, yet it can still meet the detection requirements when seeds pass through the support structure of the tube shell while allowing for the placement of relatively few sensors. Specifically, the sensors are installed at the seed outlet 171.

[0140] A single-sided buckle can be installed at the seed outlet 171, which can be fastened to the remaining mounting hole on the seed metering device.

[0141] To more clearly show the seed outlet 171, the sensor mounted on the housing portion that defines the tube structure of the seed outlet 171, and the status of the second pipe connector 172, Figures 7-9 The illustrated sensor mounting bracket is shown in a roughly inverted position.

[0142] See Figures 7-9The second type of sensor mounting bracket shown defines the cross-section of the tube shell portion of the seed outlet 171 as approximately rectangular, but it can also be other shapes, such as two curved panels connected at both ends, or two panel ends connected by a flat plate, or the seed outlet 171 being a circular outlet.

[0143] Regardless of the structural form of the outlet 171, the transmitter and receiver of the sensor should be set on opposite sides. It should be noted that even a circular outlet does not affect the understanding of the two sides. In particular, for the transmitter and receiver, their optical path determines their installation method, that is, the transmitter and receiver need to be strictly aligned. Based on this, the "two sides" can be determined.

[0144] Furthermore, based on the aforementioned structure of the seed outlet 171, the arrangement of the transmitter and receiver can be either two straight lines or two arcs. Regardless of the arrangement, the optical paths of the sensors should be as parallel as possible to achieve a relatively large coverage area with the same number of sensors.

[0145] If the sensor is arranged in two arcs, the distance between the two arcs is the farthest. This state is most easily understood with a circular seed outlet 171. One of the two arcs is located on one side of the circular seed outlet 171, and the other is located on the other side of the seed outlet 171. At this time, based on the reasonable coverage of the optical path, the two arcs are symmetrical about one side of the seed outlet 171. Obviously, the distance between the two arcs is the farthest at the middle.

[0146] If two straight lines are arranged, they are parallel to each other.

[0147] It is easy to understand that if two arrangements are used, one is the transmitter arrangement and the other is the receiver arrangement.

[0148] Furthermore, if the sensors are arranged in two straight lines, there are two options for the configuration of the second air outlet 178 or the hole group. One option is that the second air outlet 178 corresponds one-to-one with the straight line arrangement, that is, there are also two second air outlets 178, with one arrangement corresponding to one second air outlet 178. Figure 7 and Figure 8 The example structure is shown in another example. Figure 8 In the illustrated structure, a mesh 1721 is provided at the second air outlet 178 to disperse the airflow. Specifically, in a linear arrangement, sensor probes farther from the second air outlet 178 are blocked by sensor probes closer to the second air outlet 178, affecting the cleaning effect. The presence of the mesh 1721 disperses the airflow, allowing some airflow to bypass probes relatively close to the second air outlet 178 and clean probes relatively farther away from the second air outlet 178.

[0149] from Figure 7 and Figure 8 As can be seen from the positional relationship, the second air outlet 178 is located at one end of a linearly arranged, for example, transmitter array, and flows toward the other end of the transmitter array.

[0150] Figure 9 Another form is shown, in which the second air outlet 178 or the jet hole array 17711 is directly opened at the bottom of the sensor positioning slot 1771 illustrated in the figure. Under this condition, the second air outlet 178 or the jet hole array 17711 corresponds one-to-one with the probe, and there is no mutual obstruction between the probes.

[0151] If two arcs are arranged, it can be used as follows: Figure 9 The configuration shown is such that the second air outlet 178 or hole group corresponds one-to-one with the mounting position and is located on the side of the mounting position corresponding to the sensor. This side is the side where the main body of the bracket is located, so as to facilitate the formation of a cavity or channel, thereby facilitating the construction of a communication channel between the second air outlet 178 or hole group and the matched, for example, the second pipe connector 172.

[0152] exist Figures 7-9 In the illustrated structure, the mounting position is configured as a protective portion and a mounting base portion. The sensor positioning groove 1771 with an arc-shaped portion shown in the figure is mainly used to protect the sensor probe, while the portion on the back side of the sensor in the sensor mounting state constitutes as follows: Figures 7-9 The mounting base shown is the first base plate 3 shown in the figure.

[0153] The first seat plate 3 can be opened as if Figure 10 The sensor mounting hole 154 shown can also be made with only a wiring positioning groove 1731 for bending and adjusting the sensor lead, and can further be made with a wire through hole. After the sensor lead passes through the wire through hole, the wire through hole can be sealed with, for example, hot melt glue to fix the sensor lead.

[0154] The sensor positioning groove 1771 is an arc-shaped groove, and the axis of the arc-shaped groove is parallel to or consistent with the extension direction of the sensor probe.

[0155] Regarding the slot type and size of sensor positioning slot 1771, a comparison is needed. Figure 7 The example structure and Figure 9 The example structure, Figure 7 The sensor positioning slot 1771 is relatively short, mainly to allow airflow to be blown from one end of the probe arrangement, and it is necessary to avoid the probe, at least the lens, being blocked in that direction. Figure 9 In the illustrated structure, the sensor positioning slot 1771 is relatively long, so only the protection and positioning of the sensor need to be considered, and it will not obstruct the jet hole array 17711 opened at the bottom of the slot.

[0156] Figure 9 The jet hole array 17711 located at the bottom of the sensor positioning slot 1771 shown has three rows and three columns of jet holes, which can better clean the probe. If a single second air outlet 178 is used, the diameter of the single second air outlet 178 should be much larger than the diameter of the single jet hole. If the number of jet holes is 9, the cross-sectional area of ​​the single second air outlet 178 should be 1.5 to 2 times the cross-sectional area of ​​the 9 jet holes.

[0157] Based on the foregoing description, if the second air outlet 178 or the hole group is located at one end of a straight arrangement, for example, the sensor positioning groove 1771 with an arc-shaped groove is omitted or a portion of the groove wall is omitted from the end where the second air outlet 178 or the hole group is located to expose the head end of the sensor probe.

[0158] Furthermore, if the second air outlet 178 or the orifice group is located at one end of a straight arrangement, and the second air outlet 178 or the orifice group is located on the corresponding pipe body, such as... Figure 7 Or on the second pipe joint 172 on the sensor mounting bracket illustrated in example 8.

[0159] If a single pipe is adapted to a hole group, the hole group can be configured as follows: Figure 8 The example shown is formed by mesh 1721.

[0160] exist Figure 10 As can be seen in the illustrated structure, the air outlet end of the second type of sensor mounting bracket presents a stepped structure. For ease of description, the concept of a step is used to describe the structure of the air outlet end.

[0161] Accordingly, Figure 10 In the illustrated structure, the side of the two mounting positions that is furthest from each other is the back plate, which also constitutes the part corresponding to the kick surface of the step, or in other words, the part that provides the kick surface, to be used as a mounting plate for the sensor. In a preferred embodiment, the back plate has a sensor mounting hole 154.

[0162] Accordingly, Figure 10 In this configuration, the first air outlet 156 is located on the tread of the stepped structure, so that the probe extending from the kick surface is directly impacted by the first air outlet 156.

[0163] exist Figure 5 As can be seen in the illustrated structure, a guide fin 155 is provided on the kick surface of the stepped structure. The guide fin 155 is located between the sensor and the tread surface, so that part of the airflow blowing directly on the sensor is deflected toward the sensor probe side, thereby improving the cleaning ability.

[0164] Based on the aforementioned positional relationship, a further preferred configuration can be determined as follows: the airflow channel 152 is perpendicular to the sensor probe, and the radial extension of the guide fins 155 in the airflow channel 152 is equal to the radius of the airflow channel 152, that is, partially blocking the second air outlet 156, with some airflow blowing directly onto the sensor probe and some being redirected, resulting in a better overall cleaning effect on the probe.

[0165] Due to airflow interference, the aforementioned direct airflow cannot be achieved, but the interference can generate turbulence in the airflow, which can produce a better cleaning effect.

[0166] Furthermore, the angle between the guide fin 155 and the axis of the airflow channel 152 is 30°~60°.

[0167] Regarding the sensor assembly, in the embodiments of this utility model, it refers to the assembly formed after the sensor is assembled on the sensor mounting bracket.

[0168] One type I sensor mount and one type II sensor mount can be installed on a seed metering device. A seeder typically has several seed metering devices, and the distance between the seed metering devices is the spacing between plants, i.e., the width of the row.

[0169] Regarding the seed metering detection method in this utility model embodiment, it is mainly applicable to the aforementioned seed metering detection device for seed metering detection. The core of the corresponding detection method is: when both the first detection sensor and the second detection sensor detect seeds within a detection cycle, it is recorded as normal seeding in the current hole; otherwise, it is recorded as seeding failure in the current hole and marked as missed seeding. The ratio of the number of missed seeds to the expected number of seeds is recorded as the missed seeding rate. If the missed seeding rate within a predetermined time period is equal to or higher than the preset missed seeding rate, an alarm signal is generated.

[0170] Alarms are primarily issued via speakers. Additionally, as a standard configuration, seed detection devices typically include control components such as microcontrollers, human-machine interface devices like touchscreens, and memory. Some implementations also include several LEDs for status indication. Therefore, alarms can also be indicated using indicator lights, such as designated indicator lights flashing. Touchscreens can also serve as alarm signal output devices.

[0171] Regarding data storage, it can include the sowing status of each row (corresponding to the corresponding seed metering device), or the overall sowing status. Missed sowing can be reflected in the overall sowing status, or it can store and display the missed sowing status for each row.

[0172] Additionally, some implementations include a step to remove false positives, which involves:

[0173] Based on the rotation speed of the seed metering disc 2, the current time when the seed arrives at the first detection sensor and the detection window at the current rotation speed are determined. Detection information reported outside the current detection window within the current detection cycle is then discarded. It should be noted that if the sensor is cleaned using, for example, compressed air, such false alarms will be relatively less frequent.

Claims

1. A seed metering detection device for detecting seed metering in a hill-planting seeder, characterized in that, The seeding detection device includes: The first detection sensor is installed on the housing of the seed meterer and is located at the end of the running path of the seed picking component of the seed meterer's seed picking disc; The second detection sensor is installed at the seed outlet of the seed metering device.

2. The seeding detection device according to claim 1, characterized in that, The first detection sensor is located on the rear side of the second seed-dispelling component corresponding to the end segment.

3. The seeding detection device according to claim 1, characterized in that, Both the first and second detection sensors are optical sensors. The first detection sensor is included in a first sensor assembly, and the second detection sensor is included in a second sensor assembly. Both the first and second sensor assemblies include a sensor mounting bracket, which includes: The support body has a sensor mounting section; An air outlet or a group of holes is formed on a support body or disposed on a given pipe body. Accordingly, if disposed on a pipe body, the pipe body is mounted on the support body or is an integral structure with the support body. The air outlet or hole group is installed opposite to the sensor at the sensor mounting part.

4. The seeding detection device according to claim 3, characterized in that, The support body included in the second sensor assembly is a tube shell structure, with one end of the tube shell being an inlet and the other end being an outlet, and the corresponding outlet end constituting the second detection sensor mounting part; The outlet end has a set of mounting positions on each of its opposite sides. The mounting position on one side is used to install the transmitter of the optical sensor, and the mounting position on the other side is used to install the receiver of the optical sensor.

5. The seeding detection device according to claim 4, characterized in that, The arrangement of the transmitting end and the receiving end can be either two straight lines or two arcs. If there are two arcs arranged, the distance between the two arcs is the farthest. If there are two straight lines arranged in a straight line, the two lines are parallel to each other.

6. The seeding detection device according to claim 5, characterized in that, If there are two straight lines, the air outlets or orifice groups correspond one-to-one with the straight lines and are located at one end of the straight line, so as to direct the airflow towards the other end of the corresponding straight line; or The air outlet or hole group corresponds one-to-one with the mounting position and is located on the side of the mounting position corresponding to the second detection sensor; If there are two arc-shaped arrangements, the air outlets or hole groups correspond one-to-one with the mounting positions and are located on the side of the mounting position corresponding to the second detection sensor.

7. The seeding detection device according to claim 6, characterized in that, The mounting position has: The arc-shaped groove has an axis that is parallel to or consistent with the extension direction of the sensor probe of the second detection sensor. A rear mounting bracket, located on the rear side of the sensor probe, is used to mount the sensor probe. If the air outlet or hole group corresponds one-to-one with the installation position, the air outlet or hole group is opened at the bottom of the arc-shaped groove. If the air outlet or orifice group is located at one end of a straight line, the arc-shaped groove is omitted or a portion of the groove wall is omitted from the end where the air outlet or orifice group is located to expose the head end of the sensor probe.

8. The seeding detection device according to claim 6 or 7, characterized in that, If the air outlet or hole group is located at one end of a straight line, the air outlet or hole group is located on the corresponding pipe body.

9. The seeding detection device according to claim 4, characterized in that, The inlet of the tube shell forms a funnel-shaped structure, and at this funnel-shaped structure, the flow cross section gradually decreases from the inlet to the outlet.

10. The seeding detection device according to claim 3, characterized in that, The sensor mounting bracket, adapted to the first detection sensor, includes: The support arm has a pair of parallel arrangements between the two support arms. The support arm has an airflow channel arranged in the extension direction of the arm body. One end of the support arm has an air outlet and the other end has an air inlet. The air outlet is provided with a mounting position for installing a first detection sensor. The air outlet is located on one side of the mounting position so that the corresponding first detection sensor is exposed to the air outlet. Connecting arm, used for connecting two support arms in the middle or at the air inlet end of the support arm.

11. The seeding detection device according to claim 10, characterized in that, The side furthest from each other between the two mounting positions is the back plate, which serves as the mounting base for the first detection sensor, while the support arm forms a stepped structure at the air outlet end. The air outlet is located on the tread surface of the stepped structure.

12. The seeding detection device according to claim 11, characterized in that, A guide fin is provided on the kick surface of the stepped structure. The guide fin is located between the first detection sensor and the tread surface, so that part of the airflow blowing directly to the first detection sensor is deflected toward the probe side of the first detection sensor.

13. The seeding detection device according to claim 12, characterized in that, The airflow channel is perpendicular to the probe of the first detection sensor, and the radial extension of the guide fins in the airflow channel is equal to the radius of the airflow channel. The angle between the guide fins and the axis of the airflow channel is 30°~60°.

14. A seed metering device, characterized in that, Includes the seeding detection device as described in any one of claims 1 to 13.

15. A hill-planting seeder, characterized in that, It includes a frame and multiple seed metering devices as described in claim 14 arranged laterally on the frame.

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