Sensor mounting bracket, sensor assembly, seed-metering device and seeding machine

Abstract

The utility model discloses a sensor mounting bracket, a sensor assembly, a seed-metering device and a seeding machine, and the sensor mounting bracket comprises a bracket body, a sensor mounting part and a sensor mounting part, the air outlet or the hole group is formed in the support body or arranged on a given pipe body, and correspondingly, if the air outlet or the hole group is arranged on the pipe body, the pipe body is arranged on the support body or the pipe body and the support body are of an integrated structure; wherein the air outlet or the hole group is opposite to the sensor mounted at the sensor mounting part. According to the sensor mounting bracket, the sensor can be kept clean.

Description

Technical Field

[0001] This utility model relates to a mounting bracket for mounting a sensor on a seed meter, a sensor assembly equipped with a sensor mounting bracket, a seed meter equipped with the sensor assembly, and a seeder equipped with the seed meter. Background Technology

[0002] Seed metering devices, especially those used in hill-seeding machines, have very high requirements for detecting missed seeds to avoid economic losses caused by undetected missed seed amounts requiring timely repair or adjustment. Missed seed detection often relies on the reliability of the sensors installed on the seed metering device. Since seeds often have dust or other debris on them, for example, infrared sensors may accumulate dust or bran after a period of operation, leading to false detections. In other words, the reliability of infrared sensors, for example, is affected not only by their inherent reliability but also by the working environment. However, current research in the field of seeding technology lacks sufficient attention to the reliability of infrared sensors. Utility Model Content

[0003] The purpose of this utility model is to provide a sensor mounting bracket suitable for a seed metering device to keep the sensor clean. Another purpose of this utility model is to provide a sensor assembly equipped with the sensor mounting bracket. Yet another purpose of this utility model is to provide a seed metering device equipped with the sensor assembly, and further to provide a seeder equipped with the seed metering device.

[0004] According to a first aspect of the present invention, a sensor mounting bracket is provided for mounting an optical sensor on a seed metering device, the sensor mounting bracket comprising:

[0005] The support body has a sensor mounting section;

[0006] 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.

[0007] The air outlet or hole group is installed opposite to the sensor at the sensor mounting part.

[0008] Optionally, the support body is a tubular shell structure, with one end of the tubular shell being an inlet and the other end being an outlet, and the corresponding outlet end constituting a sensor mounting part;

[0009] 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.

[0010] Optionally, the arrangement of the transmitting end and the receiving end can be either two straight lines or two arcs.

[0011] If there are two arcs arranged, the distance between the two arcs is the farthest.

[0012] If there are two straight lines arranged in a straight line, the two lines are parallel to each other.

[0013] 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

[0014] 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 sensor;

[0015] 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 sensor.

[0016] Optionally, the mounting position has:

[0017] The arc-shaped groove has an axis that is parallel to or consistent with the extension direction of the sensor probe.

[0018] A rear mounting bracket, located on the rear side of the sensor probe, is used to mount the sensor probe.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] According to a second aspect of the present invention, a sensor mounting bracket is provided for mounting an optical sensor, the sensor mounting bracket comprising:

[0024] 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 sensor. The air outlet is located on one side of the mounting position so that the corresponding sensor is exposed to the air outlet.

[0025] Connecting arm, used for connecting two support arms in the middle or at the air inlet end of the support arm.

[0026] 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 sensor, so that the support arm forms a stepped structure at the air outlet end.

[0027] The air outlet is located on the tread surface of the stepped structure.

[0028] Optionally, a guide fin is provided on the kick surface of the stepped structure, which 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.

[0029] Optionally, the airflow channel is perpendicular to the sensor probe, and the radial extension of the guide fins in the airflow channel is equal to the radius of the airflow channel;

[0030] The angle between the guide fins and the axis of the airflow channel is 30°~60°.

[0031] According to a third aspect of the present invention, a sensor assembly is provided, including the sensor mounting bracket described in the first or second aspect of the present invention, and a sensor mounted on the sensor mounting bracket.

[0032] According to a fourth aspect of the present invention, a seed metering device is provided, including the sensor assembly described in the third aspect of the present invention.

[0033] According to a fifth aspect of the present invention, a seeder is provided, including the seed metering device described in the fourth aspect of the present invention.

[0034] In the embodiments of this utility model, the configured sensor mounting bracket is provided with an air outlet or a group of holes, and the air outlet or group of holes faces the sensor, which can clean the sensor, thereby preventing false alarms or missed alarms due to the sensor probe being blocked by dirt, and improving the reliability of the sensor operation. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the first structure of the sensor mounting bracket in the first embodiment.

[0036] Figure 2 This is a schematic diagram of the second structure of the sensor mounting bracket in the first embodiment.

[0037] Figure 3 This is a schematic diagram of the sensor mounting bracket structure in the second embodiment.

[0038] Figure 4 This is a schematic diagram of the sensor mounting bracket structure in the third embodiment.

[0039] Figure 5 This is a schematic diagram of the main cross-section of the sensor mounting bracket in the fourth embodiment.

[0040] Figure 6 This is a schematic diagram of the left-hand structure of the sensor mounting bracket in the fourth embodiment.

[0041] Figure 7 This is a top-section schematic diagram of the sensor mounting bracket in the fourth embodiment.

[0042] In the diagram: 1. Seed outlet, 2. Pipe connector, 3. First base plate, 4. Seed inlet hopper, 5. Seed inlet, 6. Second base plate, 7. Support platform, 8. Air outlet, 9. Airflow channel, 10. Support arm, 11. Sensor mounting hole, 12. Guide fins, 13. Mounting hole, 14. Connecting arm.

[0043] 21. Mesh sheet.

[0044] 31. Wiring positioning slot.

[0045] 71. Sensor positioning slot.

[0046] 711. Jet nozzle array. Detailed Implementation

[0047] 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.

[0048] 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.

[0049] 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 tips) are usually arranged in a circular array on the seed metering disc. When a suction nozzle reaches the seed discharge port, the seed is peeled off and enters the discharge port. When the seed is on the suction nozzle, its state is relatively stable, and therefore its position is basically fixed when it reaches the seed discharge port, so a single sensor can be used for detection. However, when the seed is peeled off at the seed discharge port, it basically falls freely, and its falling trajectory is relatively random, 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 1-4 The illustrated sensor mounting bracket is used for mounting a group of sensors; another type is... Figures 5-7 The illustrated sensor mounting bracket is used for mounting a single sensor.

[0050] 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).

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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 1-4 The illustrative structure will be used for explanation, hereinafter referred to as the first type; the other type will be described using... Figures 5-7 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.

[0057] The first type of sensor mounting bracket will be described below. Figures 1-4 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] Furthermore, adapting the air outlet 8 for cleaning requires consideration of 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 air outlet 8 configured, the bracket needs to be adjusted to match the position of the air outlet 8. Such adjustments indicate that the air outlet 8 constitutes the design basis of the bracket. In other words, in the embodiments of this utility model, the air outlet 8 and its associated structure or construction will also cause changes to the bracket.

[0062] exist Figure 2 and Figure 3 In the illustrated structure, the air outlet 8 is a functional part used for cleaning the probe. Figure 4 In the illustrated structure, the jet hole array 711 constitutes the functional part for cleaning the probe. For ease of description, the jet hole array 711 is simply referred to as the hole group, and the hole group and the air outlet 8 are collectively referred to as the cleaning unit below.

[0063] 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.

[0064] Regarding the configuration of the air outlet 8 and the hole assembly in the cleaning unit, they can be directly formed on the support body, such as... Figure 4 The jet hole array 711 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.

[0065] 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.

[0066] 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.

[0067] In addition, for example, in the case of an air outlet 8, the support body generally needs to be adapted to a flow channel. The flow channel can be directly connected to the external pipeline, or the flow channel can be adapted to a pipe fitting 2 integrally formed with the support body for connecting the pipeline.

[0068] In some implementations, the air outlet 8 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 the threaded joint.

[0069] Regarding the flow channel, it can be a channel or a cavity, such as... Figure 4The jet hole array 711 shown can be adapted to the portion of the support body for connecting the pipe connector 2. It can be a cavity or a channel. When configured as a channel, the jet hole array 711 on the same side is connected through the channel.

[0070] exist Figure 4 In the illustrated structure, each of the jet hole arrays 711 located on both sides is equipped with a pipe connector 2. In some embodiments, the jet hole arrays 711 located on both sides may be equipped with only one pipe connector 2. When only one pipe connector 2 is provided, the lumen or channel used to connect the jet hole arrays 711 on the same side is connected to that one pipe connector 2.

[0071] Figures 1-4 The middle pipe connector 2 is mainly used for the inlet of compressed gas. The corresponding seed metering device has a through hole corresponding to the pipe connector 2. 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.

[0072] Figures 5-7 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.

[0073] Compared to Figures 1-4 The illustrated sensor mounting bracket has a tubular support body. Figures 5-7 The main body of the support structure for the second type of sensor illustrated is roughly U-shaped, but considering the configuration of the pipe connector 2, it can be H-shaped. Figure 5 In a variation of the illustrated structure, if the two pipe joints 2 are combined into one, the single pipe joint 2 is simultaneously connected to the two airflow channels 9 shown in the figure through a connecting channel opened on, for example, the connecting arm 14.

[0074] Figures 5-7 The second type of sensor mounting bracket illustrated has a pair of support arms 10, which are arranged in parallel. When the bracket is mounted on the seed meterer, the extension direction of the support arms 10 is parallel to the axis of the seed meterer.

[0075] 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°.

[0076] One end of the two support arms 10 is the sensor mounting end, and the other end can introduce airflow. Therefore, the support arm 10 has an airflow channel 9 arranged in the extension direction of the arm body. One end of the support arm 10 has an air outlet 8, and the other end has an air inlet. Obviously, the air outlet 8 and the air inlet also constitute the two ends of the airflow channel 9.

[0077] One end of the support arm 10 with an air inlet can be directly formed into a pipe connector 2, and the extension direction of the pipe connector 2 is consistent with the extension direction of the support arm 10. As mentioned above, the two support arms 10 can share a single pipe connector 2, and the corresponding two airflow channels 9 can be connected through a transverse airflow channel (i.e., the aforementioned connecting channel) opened in, for example, the connecting arm 14.

[0078] Figure 5 In the middle, the connecting arm 14 also forms the seat of the support frame, which can be fixed to the housing of the seed metering device by, for example, screws.

[0079] Accordingly, the sensor is installed at the end of the second type of sensor mounting bracket where the air outlet 8 is located. At this time, the air outlet 8 directly hits the sensor probe and is used for cleaning the sensor probe.

[0080] exist Figures 5-7 In the illustrated structure, the end of the support arm 10 where the air outlet 8 is located is provided with a sensor mounting hole 11, and the optical path direction of the installed sensor is perpendicular to the blowing direction of the air outlet 8.

[0081] For ease of description, in the embodiment where the support body is mainly composed of the support arm 10, in order to distinguish the orientation, the end where the air outlet 8 is located is called the air outlet end of the support arm 10, or simply the air outlet end, and the other end is called the air inlet end, or simply the air inlet end.

[0082] The first and second type sensor mounting brackets are equipped with air outlets 8 or hole groups. The air blowing direction of the air outlets 8 or hole groups is approximately perpendicular to the optical path direction of the sensor, which is used for cleaning the sensor probe, thereby reducing false alarms or missed detections caused by the sensor lens being blocked by dirt.

[0083] The support body of the first type of sensor mounting bracket preferably adopts a tubular shell structure. Figures 1-4 The example structure clearly demonstrates this.

[0084] The support body adopts a tubular shell structure, which can be directly used as the seed outlet of the seed metering device. Figure 1 The diagram shows the approximate installation state of the support structure on the seed metering device. Seeds enter through the seed inlet 5 shown in the diagram and exit through the seed outlet 1 shown in the diagram. The upper middle part of the support structure shown in the diagram has a bucket-shaped structure, which makes the tube-shell structure of the support structure gradually narrow in the upward and downward direction, which facilitates the seeds falling more easily into the predetermined holes.

[0085] Furthermore, due to the constricted opening, the seed outlet 1 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 1.

[0086] A single-sided buckle can be installed at the seed outlet 1, which can be fastened to the remaining mounting hole on the seed metering device.

[0087] To more clearly show the seed outlet 1, the sensor installed on the housing portion of the tube structure that defines the seed outlet 1, and the status of the tube connector 2, Figures 2-4 The illustrated sensor mounting bracket is shown in a roughly inverted position.

[0088] See Figures 2-4 The second type of sensor mounting bracket shown determines that the cross-section of the tube shell portion of the seed outlet 1 is 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 1 is a circular outlet.

[0089] Regardless of the structural form of the outlet 1, 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.

[0090] Furthermore, based on the aforementioned structure of the seed outlet 1, 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.

[0091] 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 1. One of the two arcs is located on one side of the circular seed outlet 1, and the other is located on the other side of the seed outlet 1. At this time, based on the reasonable coverage of the optical path, the two arcs are symmetrical about the center plane of the seed outlet 1. Obviously, the distance between the two arcs is the farthest at the middle.

[0092] If two straight lines are arranged, they are parallel to each other.

[0093] It is easy to understand that if two arrangements are used, one is the transmitter arrangement and the other is the receiver arrangement.

[0094] Furthermore, if the sensors are arranged in two straight lines, there are two options for the configuration of the air outlets 8 or the hole groups. One option is that there is a one-to-one correspondence between the air outlets 8 and the straight line arrangement, that is, there are also two air outlets 8, with one arrangement corresponding to one air outlet 8. Figure 2 and Figure 3 The example structure is shown in another example. Figure 3 In the illustrated structure, a mesh 21 is provided at the air outlet 8 to disperse the airflow. Specifically, in a linear arrangement, sensor probes farther from the air outlet 8 are blocked by sensor probes closer to the air outlet 8, affecting the cleaning effect. The presence of the mesh 21 disperses the airflow, allowing some airflow to bypass probes relatively close to the air outlet 8 and clean probes relatively far from the air outlet 8.

[0095] from Figure 2 and Figure 3 As can be seen from the positional relationship, the air outlet 8 is located at one end of a linearly arranged, for example, transmitter array, and rushes towards the other end of the transmitter array.

[0096] Figure 4 Another form is shown, in which the air outlet 8 or the jet hole array 711 is directly opened at the bottom of the sensor positioning slot 71 illustrated in the figure. Under this condition, the air outlet 8 or the jet hole array 711 corresponds one-to-one with the probe, and there is no mutual obstruction between the probes.

[0097] If two arcs are arranged, it can be used as follows: Figure 4 The configuration shown is such that the air outlet 8 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 air outlet 8 or hole group and the matched, for example, pipe connector 2.

[0098] exist Figures 2-4 In the illustrated structure, the mounting position is configured as a protective part and a mounting base part. The sensor positioning groove 71 with an arc-shaped portion shown in the figure is mainly used to protect the sensor probe, while the part located on the back side of the sensor in the sensor mounting state constitutes as follows: Figures 2-4 The mounting base shown is the first base plate 3 shown in the figure.

[0099] The first seat plate 3 can be opened as if Figure 5The sensor mounting hole 11 shown can also have only a wiring positioning groove 31 for bending and adjusting the sensor lead, and can further have 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.

[0100] The sensor positioning groove 71 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.

[0101] Regarding the groove shape and size of sensor positioning slot 71, a comparison is made. Figure 2 The example structure and Figure 4 The example structure, Figure 2 The sensor positioning slot 71 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 4 In the illustrated structure, the sensor positioning slot 71 is relatively long, so only the protection and positioning of the sensor need to be considered, and it will not obstruct, for example, the jet hole array 711 opened at the bottom of the slot.

[0102] Figure 4 The jet hole array 711 located at the bottom of the sensor positioning slot 71 shown has three rows and three columns of jet holes, which can better clean the probe. If a single air outlet 8 is used, the diameter of the single air outlet 8 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 air outlet 8 should be 1.5 to 2 times the cross-sectional area of ​​the 9 jet holes.

[0103] Based on the foregoing description, if the air outlet 8 or the hole group is located at one end of a straight arrangement, for example, the sensor positioning groove 71 with an arc-shaped groove is omitted or a portion of the groove wall is omitted from the end where the air outlet 8 or the hole group is located to expose the head end of the sensor probe.

[0104] Furthermore, if the air outlet 8 or the group of holes is located at one end of a straight arrangement, and the air outlet 8 or the group of holes is located on the corresponding pipe body, such as... Figure 2 Or, as illustrated in example 3, on the pipe joint 2 on the sensor mounting bracket.

[0105] If a single pipe is adapted to a hole group, the hole group can be configured as follows: Figure 3 The example shown is formed by mesh 21.

[0106] exist Figure 5 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.

[0107] Accordingly, Figure 5In 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 11.

[0108] Correspondingly, the air outlet 8 is located on the tread of the stepped structure, so that the probe extending from the kick surface is directly impacted by the air outlet 8.

[0109] exist Figure 5 As can be seen in the illustrated structure, a guide fin 12 is provided on the kick surface of the stepped structure. The guide fin 12 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.

[0110] Based on the aforementioned positional relationship, a further preferred configuration can be determined as follows: the airflow channel 9 is perpendicular to the sensor probe, and the radial extension of the guide fins 12 in the airflow channel 9 is equal to the radius of the airflow channel 9. That is, part of the air outlet 8 is blocked, part of the airflow blows directly onto the sensor probe, and part of the airflow is changed in direction, resulting in a better overall cleaning effect on the probe.

[0111] 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.

[0112] Furthermore, the angle between the guide fin 12 and the axis of the airflow channel 9 is 30°~60°.

[0113] 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.

[0114] 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.

Claims

1. A sensor mounting bracket for mounting an optical sensor on a seed metering device, characterized in that, The sensor mounting bracket 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.

2. The sensor mounting bracket according to claim 1, characterized in that, The support body is a tubular shell structure, with one end of the tubular shell being an inlet and the other end being an outlet, and the corresponding outlet end forming a 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.

3. The sensor mounting bracket according to claim 2, 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.

4. The sensor mounting bracket according to claim 3, 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 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 sensor.

5. The sensor mounting bracket according to claim 4, 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. 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.

6. The sensor mounting bracket according to claim 4 or 5, 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.

7. The sensor mounting bracket according to claim 2, 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.

8. A sensor mounting bracket for mounting an optical sensor, characterized in that, The sensor mounting bracket 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 sensor. The air outlet is located on one side of the mounting position so that the corresponding 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.

9. The sensor mounting bracket according to claim 8, 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 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.

10. The sensor mounting bracket according to claim 9, characterized in that, A flow guide fin is provided on the kick surface of the stepped structure. The flow guide fin 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.

11. The sensor mounting bracket according to claim 10, characterized in that, The airflow channel is perpendicular to the sensor probe, 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°.

12. A sensor assembly, characterized in that, It includes the sensor mounting bracket as described in any one of claims 1 to 11, and the sensor mounted on the sensor mounting bracket.

13. A seed metering device, characterized in that, Includes the sensor assembly as described in claim 12.

14. A seeder, characterized in that, Includes the seed metering device as described in claim 13.

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