JP7829919B2 - Apparatus for spreading granular materials - Google Patents

Description

The present invention relates to a granular material spreading device comprising: a hopper tank provided for storing granular material and mounted on a mobile device; a discharge device connected to the hopper tank for sequentially dropping and discharging the granular material; an impeller that is rotationally driven to receive and spread the granular material discharged from the discharge device; and a spreading guide cover provided to cover the impeller from above and to guide the spreading direction of the granular material.

Conventionally, in the spray chamber of an aerial sprayer for radio-controlled helicopters, the side plates forming the spray windows are detachable from the top plate, and in this spray chamber, a rotating plate is directly supported by the motor's rotation axis, forming the bottom surface of the spray chamber. The spray passage is composed of spray material passage holes provided in multiple plate materials, and a spray material supply amount adjustment plate and a shutter plate rotate along these plate materials (see Patent Document 1).

This radio-controlled helicopter aerial sprayer allows for easy switching of the spray window opening area and direction, enabling adjustment of the spraying area on the ground.

JP-A-9-140314 (page 1)

The problem to be solved with the granular material dispensing device is that, with the conventional device, the material is dispersed in an arc shape in only one direction due to the action of the side plates. While this can suppress uneven dispensing, it presents challenges in achieving a more uniform dispensing concentration and dispensing the material more efficiently over a wider area.

Therefore, the objective of the present invention is to provide a granular material dispensing device that can disperse granular material more efficiently and uniformly over a wider area by dispersing it in a more linear manner in the left-right direction.

To achieve the above objective, the present invention comprises the following configuration.
According to one embodiment of a granular material spreading device according to the present invention, the granular material spreading device comprises a hopper tank provided for storing granular material and mounted on a mobile device, a discharge device connected to the hopper tank for sequentially dropping and discharging the granular material, an impeller that is rotationally driven to receive and disperse the granular material discharged from the discharge device, and a spreading guide cover provided to cover the impeller from above and to guide the direction of dispersal of the granular material, wherein the spreading guide cover is located on the front side in the direction of movement of the mobile device. Alternatively, the impeller is provided with a rear side and extending left and right in close proximity to the outer edge of the impeller, and includes one side wall guide and the other side wall guide that guide the spraying direction of the granular material in the left and right directions, the impeller comprises a disc portion that rotates to receive the supply of the granular material, and a plurality of fin portions provided in a manner that extends from the side of the rotation axis of the disc portion toward the periphery, the shape of which the fin portions are provided in a concave shape that receives air pressure in the direction of rotation , and the disc portion is provided with a discharge hole through which the granular material can pass so that it can fall .

Furthermore, according to one embodiment of the granular material dispensing device of the present invention, the discharge port for dropping and discharging the granular material of the discharge device is located on the top cover portion of the dispensing guide cover, and is characterized in that it is open between the periphery of the disc portion of the impeller, which is close to either one of the side wall guide portions or the other side wall guide portion, and the rotation axis of the disc portion, so as to allow the granular material to be supplied.

Furthermore, according to one embodiment of the granular material dispersing device of the present invention, a scattering suppression wall is provided that hangs down from a portion of the top cover portion located on either the one or the other side wall guide portion that is not adjacent to the location of the discharge port. This wall is positioned to suppress the scattering of the granular material from the portion of the impeller's periphery that is adjacent to the one or the other side wall guide portion, corresponding to the upstream portion of the airflow generated by the rotation of the impeller.

Furthermore, according to one embodiment of the granular material dispersing device of the present invention, one fixed guide vane is provided, which hangs down from the top cover portion at a position immediately downstream of the airflow generated by the rotation of the impeller relative to the position of the discharge port, and extends left and right with respect to the direction of movement of the moving device to guide the granular material to be dispersed in one direction (left or right); and another fixed guide vane is provided, which hangs down from the top cover portion at a position diagonally opposite to the first fixed guide vane with respect to the axis of rotation, and extends left and right with respect to the direction of movement of the moving device to guide the granular material to be dispersed in the other direction (left or right).

Furthermore, according to one embodiment of the granular material dispensing device of the present invention, a flap device is provided at each of the left and right ends of the dispensing guide cover so as to be able to adjust the dispensing angle in the vertical direction.
Furthermore, according to one embodiment of the granular material dispersing device of the present invention, the disc portion of the impeller is characterized by having an auxiliary fin portion provided in addition to the fin portion, and/or a dropping hole from which the granular material can be dropped.

Furthermore, according to one embodiment of the granular material dispersing device of the present invention, the mobile device can be characterized by being a drone.

The granular material dispensing device according to the present invention offers a particularly advantageous effect: by dispensing the granular material in a more linear fashion in the left-right direction, it can be distributed more efficiently and uniformly over a wider area.

This is a front view showing an example of a drone equipped with a granular material dispersing device according to the present invention. This is a perspective view from the bottom side showing an example of the form of a granular material dispensing device according to the present invention. This is a perspective view from the bottom side, showing the impeller removed from the example configuration in Figure 2. This is a perspective view from the planar side, showing the impeller removed from the example configuration in Figure 2. This is a bottom view showing the impeller attached to the example configuration in Figure 2. This is a bottom view showing the impeller removed from the example configuration in Figure 2. This is a cross-sectional view showing the example of the form in Figure 2, with the left and right sides broken through the center. This is a schematic plan view illustrating an example of the dispersal of granular material (seed rice) in a paddy field by a drone equipped with a granular material dispersing device according to the present invention (a), and an example of the dispersal of granular material by a drone equipped with a conventional granular material dispersing device (b).

The following describes in detail, based on the attached drawings (Figures 1-8), an example of the form of the granular material spreading device according to the present invention. This granular material spreading device can be used by being mounted on a mobile device such as a drone (unmanned aerial vehicle) that can fly by wireless control or automatic control using GPS (Global Positioning System) or a wireless communication network. The mobile device according to the present invention includes agricultural machinery such as tractors, as well as vehicles that travel on the ground. Examples of granular materials targeted by the present invention include rice seeds for direct seeding, granular fertilizers, and chemicals.

The granular material dispensing device according to the present invention, as shown in Figures 1 and 2, has a basic configuration comprising: a hopper tank (storage container) 14 provided for storing the granular material and mounted on a mobile device (in this embodiment, a drone 10); a discharge device 16 connected to the hopper tank 14 for sequentially dropping and dispensing the granular material; an impeller 20 (see Figure 2, etc.) that is rotationally driven to receive and disperse the granular material discharged from the discharge device 16; and a dispensing guide cover 30 provided to cover the impeller 20 from above and guide the dispensing direction of the granular material.

The drone 10 in this embodiment, as shown in Figure 1, has a typical configuration including a main body 11, propellers 12, and legs 13. Furthermore, the discharge device 16, which includes a mechanism and drive means for sequentially discharging granular material, and the drive unit, which includes a drive motor for the impeller 20 that disperses the granular material, can be existing components. In this embodiment, the discharge device 16 and the drive unit for the impeller 20 are integrated into a single discharge/dispersion drive unit 15. Additionally, as shown in Figure 2, a stirring coil 16b, which is rotated by a stirring motor 16a and operates within the hopper tank 14 to prevent clogging of the granular material, is positioned at the connection port of the discharge device 16 to the hopper tank 14.

Furthermore, in the granular material dispersing device according to the present invention, as shown in Figures 2 to 7, the dispersing guide cover 30 is provided with one side wall guide portion 32a and the other side wall guide portion 32b, which are positioned on the front or rear side in the direction of movement (flight direction) of the mobile device (in this embodiment, the drone 10) and extend to the left and right in close proximity to the outer edge of the impeller 20 (in this embodiment, the periphery 23 of the disc portion 21), and which guide the dispersal direction of the granular material in the left and right directions.

In this embodiment, the spray guide cover 30 is formed from plate-like components, including the top cover portion 31, one side wall guide portion 32a, and the other side wall guide portion 32b, as well as the flap plate 41 described later. It is formed as a rectangular box-shaped structure that is longer in the left-right direction relative to the flight direction (front-back direction) of the drone 10, and is designed to be used in an inverted position. Furthermore, the top cover portion 31 of the spray guide cover 30 has a shape where the left and right end portions are gently inclined downwards relative to the central portion in the left-right direction, guiding the spraying direction of the granular material diagonally downwards at a shallow angle.

In this embodiment, the spray guide cover 30 is formed by a top cover portion 31, one side wall guide portion 32a, and the other side wall guide portion 32b, creating an inverted rectangular box with a U-shaped cross-section. However, it is not limited to this configuration. That is, the length of the guide surfaces (inner surfaces) formed by the top cover portion 31 and the one and one and one side wall guide portions 32b should extend along the tangential direction of the disc portion 21 of the impeller 20 and be formed at least in the direction in which the granular material is sprayed as the impeller 20 rotates. The lengths of the one and one side wall guide portions 32a and 32b may be substantially half the length compared to this embodiment, for example.

Furthermore, in the granular material spreading device according to the present invention, the impeller 20 comprises a disc portion 21 that rotates to receive the supply of granular material, and a plurality of fin portions 25 that extend from the side of the rotation axis 22 of the disc portion 21 to the periphery 23. The shape of the fin portions 25 is such that it receives air pressure in a concave shape in the direction of rotation (see the arrow direction in Figures 3, 4, and 5). In other words, the fin portions 25 are formed in a concave shape that scoops in air and are positioned to rotate in a direction that is more susceptible to air resistance.

In this embodiment of the impeller 20, the disc portion 21 has a flat bottom plate, and is equipped with a plate-shaped inner bottom surface that instantaneously receives the granular material supplied from the discharge device 16. Furthermore, as shown in Figure 4, the impeller 20 in this embodiment has three fin portions 25, positioned at three equal divisions of the circumference on the upper side of the disc portion 21. Each fin portion 25 in this embodiment is formed by bending a strip-shaped plate material into a hook shape near the peripheral edge 23 of the disc portion 21, so that it receives air pressure in a concave shape in the rotational direction. Note that the fin portions 25 are not limited to this configuration; any configuration that effectively receives air pressure in a concave shape to efficiently transmit centrifugal force to the granular material is acceptable. For example, they may be formed in a smooth arc shape.

In this embodiment, the impeller 20 has a gap 24 between each fin 25 and the rotating shaft 22. This gap 24 prevents granular materials such as rice seeds, which fall from the hopper tank 24 through the discharge port 17, from becoming unevenly distributed on the disc portion 21 (inner bottom surface). In other words, the gap 24 allows the granular materials to move somewhat freely, distributing them evenly on the disc portion 21 and further suppressing variations in lateral dispersal.

Furthermore, in the granular material dispensing device according to the present invention, the impeller 20 may be configured to include an auxiliary fin portion 26 in addition to the fin portion 25 on the disc portion 21, and/or a drop hole 27 from which the granular material can be dropped. This configuration allows for more uniform dispensing of the granular material.

In this embodiment, as shown in Figure 4 and other figures, the disc portion 21 of the impeller 20 has multiple fin portions 25, and auxiliary fin portions 26 are provided at intermediate points (equally divided circumferential angles) between the fin portions 25. The auxiliary fin portions 26 in this embodiment are shorter than the fin portions 25 and are positioned closer to the periphery 23 of the impeller 20. These auxiliary fin portions 26 have the effect of further suppressing variations in the lateral dispersion of granular material.

Furthermore, in this embodiment, as shown in Figure 4, the disc portion 21 of the impeller 20 is provided with a discharge hole 27 that allows granular material such as rice seeds to pass through appropriately, so that the granular material can fall in a balanced manner directly below the drone. The discharge hole 27 in this embodiment is located slightly closer to the rotation axis 22 in the intermediate area between the rotation axis 22 and the peripheral edge 23 of the impeller 20, and is positioned close to the concave surface of each fin portion 15 between adjacent fin portions 25. By arranging the discharge hole 27 in this way, it is possible to drop a more appropriate amount of granular material directly below the drone, considering the relationship (balance) between the centrifugal force acting on the granular material and its tendency to accumulate.

The granular material dispensing device according to the present invention offers a particularly advantageous effect compared to conventional devices: by dispensing the granular material more linearly in the left-right direction, it can be distributed more efficiently and uniformly over a wider area.
In other words, according to the granular material dispersing device of the present invention, when mounted on a drone, for example, as shown in Figure 8(a), the granular material (seed rice) can be dispersed in a more linear, band-like (or rectangular) shape, spreading more linearly to the left and right, with a more uniform concentration. Compared to the conventional fan-shaped dispersal (Figure 8(b)), it can be dispersed more effectively to the corners of the paddy field and maintain uniformity over longer distances in the left and right directions, thereby increasing the efficiency of the dispersal work. (Note that the dotted arrows in Figure 8 indicate the flight path.) Furthermore, because the granular material can be dispersed more uniformly, it can be dispersed efficiently, eliminating waste of the granular material. Therefore, for example, as shown in Figure 8(a), when the present invention is used for direct seeding of rice seeds, the work efficiency is increased, production efficiency is improved, and the cost of rice production can be reduced.

Furthermore, in this embodiment, as shown in Figure 6, the discharge port 17 from which the granular material of the discharge device 16 is dropped and discharged is located on the top cover portion 31 of the spray guide cover 30. It opens between the periphery 23 of the disc portion 21 of the impeller 20, which is adjacent to one of the pair of side wall guide portions (in this embodiment, one of the side wall guide portions 32a), and the rotation axis 22 of the disc portion 21, allowing the granular material to be dropped and supplied.

In this embodiment of a granular material dispensing apparatus using the discharge device 16, the discharge device 16, equipped with the discharge port 17, does not have a perfectly symmetrical shape with respect to the dispensing guide cover 30. However, it can still dispensing the granular material linearly in both left-right and right-handed directions while maintaining uniformity of concentration. In other words, this granular material dispensing apparatus with the discharge device 16 can dispensing the granular material more evenly and over a wider area, improving dispensing efficiency, and its shape is designed for easy manufacturing.

Thus, even when the discharge port 17 of the discharge device 16 is positioned in a location that does not exhibit perfect symmetry, the reason why it can evenly disperse in both left and right directions is thought to be that the rotational movement of the impeller 20 creates negative pressure in the center of the impeller 20, based on the principle of a centrifugal blower (such as a sirocco fan). Immediately after being discharged from the discharge port 17 of the discharge device 16, the granular material instantaneously behaves as if being drawn, at least partially, towards the center of the disc portion 21 of the impeller 20, and then, due to centrifugal force, is thrown outwards, thus dispersing it. Furthermore, the shape of the fin portion 25 in this embodiment, compared to radially arranged and linearly formed fins, allows the granular material to be retained more effectively on the disc portion 21, enabling a stronger centrifugal force to be applied.

Furthermore, while it is possible to improve symmetry by dividing the discharge port 17 into two or more sections at point-symmetrical positions, this would complicate the shape and increase manufacturing costs. Additionally, if multiple discharge ports 17 are positioned symmetrically, the granular material must be discharged evenly from each port; otherwise, the distribution on both sides will not be uniform. Therefore, uniform distribution of the granular material is not always guaranteed.

Furthermore, in this embodiment, the impeller 20 is provided with a scattering suppression wall (one scattering suppression wall 33a) that hangs down from the portion of the top cover 31 located on the side of the side wall guide portion (in this embodiment, the other side wall guide portion 32b) that is not close to the position of the discharge port 17. This wall is positioned to suppress the scattering of granular material from the portion of the impeller 20's periphery 23 that is close to the other side wall guide portion 32b, corresponding to the upstream portion of the airflow generated by the rotation of the impeller 20.

Furthermore, in this embodiment, a scattering suppression wall (the other scattering suppression wall 33b) is provided, which hangs down from the portion of the top cover 31 located on the side of the side wall guide portion (in this embodiment, one side wall guide portion 32a) adjacent to the outlet. This wall corresponds to the upstream portion of the airflow generated by the rotation of the impeller 20, and suppresses the scattering of granular material. That is, the one scattering suppression wall 33a and the other scattering suppression wall 33b are positioned diagonally opposite each other with respect to the rotation axis 22 of the impeller 20.

As shown in Figure 5, one scattering suppression wall 33a and the other scattering suppression wall 33b in this embodiment are formed in an arc shape and are arranged concentrically with the rotation axis 22 of the impeller 20, with a required gap between them and the periphery 23 of the disc portion 21 of the impeller 20. By adjusting this gap, the amount of granular material dispersed directly below and around the discharge device 16 can be adjusted so that some of the material leaks out. Furthermore, the shapes of the one scattering suppression wall 33a and the other scattering suppression wall 33b are not limited to this; for example, as long as the inner surface of the disc portion 21 of the impeller 20 relative to the periphery 23 has a curved, arc-shaped cross-section, the shape of the outer surface is not particularly limited. Furthermore, the shape and arrangement of one scattering suppression wall 33a and the other scattering suppression wall 33b may be selectively adjusted as appropriate, and are not limited to being arranged in point-symmetrical positions and of the same size as in this example. For example, depending on various differences in conditions, the arrangement and coverage angle of one scattering suppression wall 33a may be increased to enhance the scattering suppression effect compared to the other scattering suppression wall 33b, thereby adjusting the balance of scattering of granular material in both left-right directions.

According to this, it is possible to moderately prevent excessive amounts of granular material from being scattered (falling) in a highly concentrated state in the area closer to the area directly below the drone 10 (directly below the central part in the left-right direction of the spraying guide cover 30), thereby enabling more uniform distribution of the granular material. While this effect is expected to vary under various conditions, in this embodiment, the effect is more pronounced with one of the scattering suppression walls 33a. This is because the scattering suppression wall 33a corresponds to the area on the disc portion 21 of the impeller 20 where the granular material discharged from the discharge port 17 of the discharge device 16 is in a more concentrated state.

Furthermore, in this embodiment, one fixed guide vane (in this embodiment, one half-position fixed guide vane 35a and one quarter-position fixed guide vane 35b) is provided, suspended from the top cover portion 31 at the immediate downstream position in the airflow generated by the rotation of the impeller 20 relative to the position of the discharge port 17. It extends left and right with respect to the direction of movement of the mobile device (in this embodiment, the drone 10) and guides the granular material to be dispersed in one direction (left or right). In addition, another fixed guide vane (in this embodiment, the other half-position fixed guide vane 37a and the other quarter-position fixed guide vane 37b) is provided, suspended diagonally opposite to the first fixed guide vane around the rotation axis 22, and extends left and right with respect to the direction of movement of the mobile device (in this embodiment, the drone 10) to guide the granular material to be dispersed in the other direction (left or right).

With this fixed guide vane, the one side wall guide section 32a, the other side wall guide section 32b, and the top cover section 31 allow for the proper configuration of a lateral passage through which the granular material can be guided and dispersed, so that it is more appropriately restricted (controlled) in the left-right direction. As a result, the granular material is dispersed more restrictively in both left-right and right-hand directions tangential to the disc section 21 of the impeller 20, allowing for more linear, band-like dispersion that extends further and more uniformly to the left and right, thereby increasing dispersion efficiency and improving productivity.

In this embodiment, two fixed guide vanes are arranged in point-symmetrical positions on both sides. However, the present invention is not limited to this configuration. For example, instead of symmetrical arrangement, the positional relationship between the two fixed guide vanes may be adjusted to differ on the left and right sides. Furthermore, there may be only one vane each, or three or more. The positional relationship between the two fixed guide vanes can also be adjusted according to various spraying conditions. For example, by bringing the position of one quarter-position fixed guide vane 35b of one fixed guide vane closer to the side wall guide (one side wall guide 32a in this embodiment), it is possible to suppress the granular material, immediately after being discharged from the discharge port 17 of the discharge device 16 and supplied onto the disc portion 21 of the impeller 20, from spraying in only one direction (left-right). This allows for adjustment of the balance of spraying in both directions (left-right and right-right).

Furthermore, the shape and arrangement of the half-position fixed guide vane and quarter-position fixed guide vane, which are components of one fixed guide vane and the other fixed guide vane in this embodiment, can be selectively set as appropriate to adjust the balance of granular dispersion in both directions to the right. In this embodiment, the quarter-position fixed guide vane is arranged in a shape that tapers in a direction that expands its passage toward the dispersion direction (outward) in relation to the side wall guide section, while the half-position fixed guide vane is arranged parallel to the side wall guide section, so that in relation to the quarter-position fixed guide vane, its passage narrows toward the dispersion direction (outward). Therefore, although the airflow effect from the fin portion 25 of the impeller 20 is considered to be smaller than the effect from the centrifugal force of the impeller 20, the passage between the quarter-position fixed guide vanes and the side wall guide section becomes negative pressure, drawing in granular material and facilitating more linear dispersal along the side wall guide section in the left-right direction. The passage between the quarter-position fixed guide vanes and the half-position fixed guide vanes becomes positive pressure, generating a high-velocity airflow in the left-right direction. This airflow acts as a wall, guiding the granular material to disperse more linearly, thus contributing to improved dispersal efficiency as described above.

Furthermore, in this embodiment, flap devices 40 are provided at each of the left and right ends of the spray guide cover 30 to adjust the spray angle in the vertical direction. That is, in this embodiment, the flap plate 41 is configured to be rotatable by the flap plate drive device 42 so as to be adjustable to a desired vertical angle.

According to this, it is possible to control and adjust the size of the lateral spraying range and the spraying concentration according to various spraying conditions, such as the type of granular material to be sprayed, the flight conditions of the drone including its flight performance and flight path (flight altitude, etc.), and the natural environment including weather conditions. This enables optimal spraying according to the spraying conditions, improving work efficiency and increasing productivity.

Although the present invention has been described in detail with reference to preferred embodiments, it is important to note that the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention.

10 Drone 11 Main body 12 Propeller 13 Legs 14 Hopper tank 15 Discharge/spray drive unit 16 Discharge device 16a Agitation motor 16b Agitation coil 17 Discharge port 20 Impeller 21 Disc section 22 Rotating shaft 23 Periphery 24 Gap 25 Fin section 26 Auxiliary fin section 27 Drop hole 30 Spray guide cover 31 Top cover section 32a One side wall guide section 32b Other side wall guide section 33a One scattering suppression wall 33b Other scattering suppression wall 35a One half-position fixed guide vane 35b One quarter-position fixed guide vane 37a Other half-position fixed guide vane 37b Other quarter-position fixed guide vane 40 Flap device 41 Flap plate 42 Flap plate drive device

Claims (7)

A granular material spreading device comprising: a hopper tank provided for storing granular material and mounted on a mobile device; a discharge device connected to the hopper tank for sequentially dropping and discharging the granular material; an impeller that is rotationally driven to receive and spread the granular material discharged from the discharge device; and a spreading guide cover provided to cover the impeller from above and to guide the direction of spreading the granular material, wherein
The spray guide cover is provided with one side wall guide portion and the other side wall guide portion, which are positioned on the front or rear side in the direction of movement of the moving device and extend to the left and right in close proximity to the outer edge of the impeller, and which guide the spraying direction of the granular material in the left and right directions.
A granular material spreading device characterized in that the impeller comprises a disc portion that rotates to receive the supply of the granular material, and a plurality of fin portions that are provided in a manner that extends from the side of the rotation axis of the disc portion toward the periphery, wherein the shape of the fin portions is provided in a manner that receives air pressure in a concave shape in the direction of rotation , and the disc portion is provided with a discharge hole through which the granular material can pass so that it falls . The granular material dispensing device according to claim 1, characterized in that the discharge port for dropping and dispensing the granular material of the discharge device is located on the top cover portion of the dispensing guide cover, and is open between the periphery of the disc portion of the impeller, which is close to either the one side wall guide portion or the other side wall guide portion, and the rotation axis of the disc portion, so as to supply the granular material. The granular material dispensing device according to claim 2, characterized in that the impeller is provided with a scattering suppression wall that hangs down from a portion of the top cover located on either the one or the other side wall guide that is not adjacent to the location of the discharge port, and the scattering suppression wall is provided in a manner that suppresses the scattering of the granular material in a manner corresponding to the upstream portion of the airflow generated by the rotation of the impeller, from the portion of the impeller's periphery that is adjacent to the one or the other side wall guide. The granular material dispersing device according to claim 3, characterized in that one fixed guide vane is provided, which hangs down from the top cover portion at a position immediately downstream of the airflow generated by the rotation of the impeller relative to the position of the discharge port, and extends left and right with respect to the direction of movement of the moving device to guide the granular material to be dispersed in one direction (left or right); and another fixed guide vane is provided, which hangs down from the top cover portion at a position diagonally opposite to the first fixed guide vane with respect to the axis of rotation, and extends left and right with respect to the direction of movement of the moving device to guide the granular material to be dispersed in the other direction (left or right). A granular material spreading device according to any one of claims 1 to 4, characterized in that flap devices are provided at each of the left and right ends of the spreading guide cover to allow adjustment of the spreading angle in the vertical direction. The granular material spreading device according to any one of claims 1 to 4, characterized in that the disc portion of the impeller is provided with an auxiliary fin portion that is shorter than the fin portion , in addition to the fin portion. The granular material dispensing device according to any one of claims 1 to 4, characterized in that the mobile device is a drone.