JP2003023949A - Particulate sprayer for helicopter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a powdery particulate sprayer for helicopter that can attain the uniform spraying of particulate substance. SOLUTION: The powdery particulate sprayed 10 can detachably loaded on the main body of a helicopter and is equipped with a tank 19 receiving the particulate particles to be sprayed, the impeller 20 rotary-driven around the axis of the rotation 0 and the impeller cover covering the upper side of the impeller 20. The impeller cover 30 covers the disk-shaped upper cover 31 covering the impeller 20 and the side face of the impeller 20 and is equipped with cone-shaped side face covers 32, 33 that move outward as they go downward to limit the spray distance. Further, a plurality of outputting openings 26a for feeding the particles stored in the tank 19 to the upper face side of the impeller 20 are arranged radially from the rotary axis center at an equal interval.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a helicopter spraying device for spraying and sowing powdery and granular sprayed materials such as chemicals, fertilizers and seeds.

[0002]

2. Description of the Related Art Generally, when a large amount of powdery or granular dispersal agents such as pest control agents are applied to a large area of forest or farmland, helicopters on board the pilot are used. There is. Airborne spraying with such manned helicopters is difficult for small fields such as fields.
In addition, it requires an excessive spraying cost.

Therefore, there has been proposed a spraying device for spraying a granular sprayed material in the air by mounting the spraying device on a relatively small unmanned helicopter capable of wireless remote control.

This type of spraying device is disclosed, for example, in Japanese Patent Laid-Open No. 9-2.
As disclosed in Japanese Patent No. 75877, and as shown in FIG. 12, a feeding case 102 is provided at the bottom of a tank 101 for scattered materials attached to the lower side of the body of a helicopter, and a bearing 103 provided in the feeding case 102 is used. Drive shaft 10
4 is pivotally supported, and a disc-shaped impeller 105 having a plurality of impeller blades 105a erected on the upper surface side is fixed to the lower end of the drive shaft 104, and the impeller motor 106 is fixed to the upper surface of the tank 101 by the impeller motor 106. The impeller 105 is configured to rotate in one direction. Further, the impeller 10 is provided on the lower end side of the feeding case 102.
An outlet cylinder 107 having a discharge port for supplying the spraying agent to 5 is fixed, and a shutter 108 is interposed between the feeding case 102 and the outlet cylinder 107.

An upper surface cover 109 for covering the upper surface side of the impeller 105 is attached to the bearing 103, and further, a rear surface side of the impeller 105 which shields the rear surface side of the impeller 105 and is movable to the upper and lower rotation sides of the impeller 105. 110 is provided. This side cover 110
Is moved to change the spraying direction and the spraying width of the impeller 105.

On the other hand, Japanese Patent Laid-Open No. 11-138070 discloses controlling the number of revolutions of an impeller to widen or narrow the spraying range of the sprayed material, and
It is disclosed that a side cover extending around the impeller from a front peripheral edge portion of an upper surface cover that covers the upper side surface of the impeller is provided to limit the discharge direction of the scattered matter.

Further, Japanese Laid-Open Patent Publication No. 11-243829 discloses that a top cover is used to shield the top side of the impeller and a side cover is provided to cover the back side of the impeller.

Further, in the spraying devices disclosed in Japanese Patent Laid-Open No. 9-275877 and Japanese Patent Laid-Open No. 11-138070, there is one discharge port for supplying the sprayed material from the tank to the impeller on the rear side of the drive shaft. Japanese Patent Laid-Open No. 11-24382
In the publication No. 9, two are provided on the rear side.

[0009]

On the other hand, in the case where one discharge port is provided to the impeller or two discharge ports are provided to the rear side, the distribution direction of the scattered matter by the impeller depends on the rotation speed of the impeller. Because of the change, it is necessary to increase the rotation speed of the impeller to widen the spraying direction of the sprayed material, and to reduce the rotation speed of the impeller to suppress the spraying direction. On the other hand, since the spraying distance of the spraying agent also depends on the centrifugal force generated corresponding to the rotation speed of the impeller, if the rotation speed of the impeller is lowered to suppress the spraying direction, a sufficient spraying distance cannot be secured, resulting in an efficient There is a concern that it will not be possible to carry out a spraying work of such a sprayed product.

Therefore, in the spraying device disclosed in each of the above-mentioned publications, the rotation speed of the impeller is set high to secure the spraying distance, and the side cover limits the spraying direction of the spraying agent. .

However, since the spraying direction is limited by the side cover, when spraying while moving the helicopter forward and backward, the timing to start spraying the sprayed material must be changed when moving forward and when moving backward. Not only that, there is a risk that the sprayed material will spread from the spraying area such as the field where the spraying agent is sprayed to the area that does not require spraying, and it may affect the crop growth in other fields. In some cases, the spraying of the sprayed material cannot be achieved.

As disclosed in Japanese Patent Laid-Open No. 11-275877, even if the side cover is movable, if there is only one outlet for supplying the sprayed material to the impeller, the position of the outlet and the impeller Since the spraying direction and spraying distance are determined by the number of revolutions, the spraying tendency peculiar to the device cannot be changed, and the spraying start timing of the sprayed material due to the forward and backward movements of the helicopter cannot be set at the same time.

Further, if, as in JP-A-11-138070, the number of revolutions of the impeller is controlled so that the spraying distance is the same and the spraying start timing by forward and backward movements is the same, the spraying direction is also restricted according to the spraying distance. To be done. As a result, it becomes impossible to evenly spread the sprayed material.

SUMMARY OF THE INVENTION Therefore, an object of the present invention made in view of the above point is to provide a helicopter spraying device which can easily and evenly disperse a powdery or granular sprayed product.

[0015]

A helicopter spraying device according to claim 1, which achieves the above object, is detachably mounted on a main body of a helicopter, and stores a powdery or granular sprayed material, and the tank. An impeller that is arranged below and that is driven to rotate about a rotation axis that extends in the up-down direction, and an impeller cover that covers the upper surface side of the impeller, and the sprayed material in the tank is discharged through the discharge port. In the helicopter spraying device detachably mounted on the body of the helicopter for supplying and spraying on the upper surface side of the impeller, the impeller cover is a disk-shaped upper surface cover that concentrically covers the upper surface side of the impeller. , The upper end is joined along the peripheral edge of the upper cover to cover the side surface side of the impeller, and the spreading distance is limited by a conical surface shape that gradually shifts outward as it moves downward. And a side cover, and the discharge port is characterized in that a plurality of arranged at equal intervals about said axis of rotation.

According to the first aspect of the present invention, the sprayed material is supplied in a balanced manner around the rotation axis to the upper surface side of the impeller from each of the plurality of discharge ports arranged at equal intervals around the rotation axis, and the rotating impeller rotates. The spray distance is uniformly discharged from the entire circumference in the tangential direction, and the spray distance is effectively set by being guided according to the inclination angle set so as to be displaced outward as it moves downward of the side cover. Therefore, uniform spraying of the sprayed product can be obtained without the spraying direction being influenced by the rotational speed of the impeller.

According to a second aspect of the present invention, in the helicopter spraying device according to the first aspect, a pair of the side covers are provided on the upper cover with a space therebetween.

According to the second aspect of the present invention, by disposing the pair of side covers with a space therebetween, a part of the sprayed material discharged by the impeller is limited by each side cover. On the other hand, a part is sprayed on the side cover without limiting the sprayable distance,
The distribution range and distribution state of the sprayed material are adjusted.

According to a third aspect of the present invention, in the helicopter sprinkling device of the second aspect, the helicopter sprinkling device is limited by a sprinkling distance circle having a radius at which the impeller can scatter a sprinkling object around the rotation axis and a side cover. The space between the side covers is set between the tangents that are in contact with the outer periphery of the impeller through the intersections with a pair of linear spraying distance lines that pass through the spraying distance.

According to the third aspect of the present invention, the spreading distance is limited by the side cover, and the spreading range of the spreading material which is sprayed on the side cover without limiting the spreading distance is a spreading distance circle. It is surrounded and set between both spreading distance lines. In particular, when the spray distance lines are arranged in parallel, a spray tendency similar to a normal distribution shape is obtained, and the spray objects can be sprayed substantially uniformly by spraying at a substantially constant spray flight interval.

According to a fourth aspect of the present invention, in the helicopter spraying device according to the second or third aspect, the mounting direction of the impeller cover about the rotation axis can be changed.

According to the fourth aspect of the present invention, by changing the mounting direction of the impeller cover, it is possible to facilitate the spraying corresponding to the shape of the spray area.

According to a fifth aspect of the present invention, in the helicopter spraying device of the third aspect, the spraying distance lines are equidistant from each other via the rotation axis and orthogonal to the forward flight direction of the helicopter. It is characterized by being set in parallel.

According to the invention of claim 5, the helicopter is moved forward and backward by arranging each of the spray distance lines parallel to each other at an equal distance from the rotation axis through the rotation axis and making them orthogonal to the forward flight direction of the helicopter. In forward / backward spraying in which the above steps are repeatedly sprayed, face-to-face spraying only by forward movement, and the like, the spray start timing can be set to a constant value without changing, and imbalance of spraying in the spray area can be suppressed. Further, the spraying operation is facilitated, the efficiency of the spraying work can be obtained, and the spraying outside the spraying area can be effectively suppressed.

The invention of the helicopter spraying device according to claim 6 is detachably mounted on the body of the helicopter,
The tank is provided with a powdery granular material and an impeller disposed below the tank and driven to rotate about an axis of rotation extending in the up-down direction. In the spraying device for supplying and spraying on the upper surface side of the impeller, a plurality of the discharge ports are arranged at equal intervals around the rotation axis.

According to the sixth aspect of the present invention, the sprayed material is supplied to the upper surface side of the impeller in a balanced state from the plurality of discharge ports arranged at equal intervals around the rotation axis. Therefore, the sprayed material can be sprayed substantially uniformly in the circumferential direction without being affected by the rotation speed of the impeller.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a helicopter spraying device according to the present invention will be described with reference to FIGS.

FIG. 1 is a side view of an essential part showing an outline of the present embodiment, FIG. 2 is a front view, FIG. 3 is a plan view, and FIG. 4 is a partially cutaway enlarged explanatory view of an A part of FIG. 5 is a partially cutaway bottom view of FIG. 4. The arrow FWD direction indicates the forward direction.

In the figure, reference numeral 1 denotes an unmanned helicopter which is remotely controlled by radio from a transmitter, and a pair of left and right landing legs 3 are attached to the lower surface of a body 2 of the body. In the electric / electronic equipment room 4 arranged in the main body 2 and near the base ends of the landing legs 3, the spraying device 10 mounted on the main body 2 is operated by remote control from the ground by a transmitter. Built-in controller and power supply.

The spraying device 10 is for spraying powdered and granular sprayed substances such as chemicals, fertilizers, seeds, etc., and has a machine body mounting portion 11 formed on the upper part thereof on the lower surface of the machine body 2 such as bolts. It is detachably attached by.

A main body 13 of an impeller motor 12 having a drive shaft 14 extending in the vertical direction on the lower surface of the machine body mounting portion 11.
Is attached. Main body 13 of impeller motor 11
From the above, a cylindrical support cylinder 15 is extended so as to surround the drive shaft 14, and at the lower end of the support cylinder 15, a flat base plate 16 having an opening (not shown) through which the scattered material flows is attached. ing. The support cylinder 15 is detachably fixed with a screw 15a so that the opening area can be changed depending on the type of the scattered material.

On the upper surface of the base plate 16, a main tank 18 for accommodating powdered and granular material is continuously arranged via a delivery cylinder 17 arranged so as to surround the support cylinder 15 with a gap. A pair of sub-tanks 19 branching to the left and right of the machine body 2 are continuously formed above the main tank 18, and a spray material inlet 19a is formed on the upper surface of each sub-tank 19.

An impeller 20 is fixed to the lower end of the drive shaft 14 protruding from the base plate 16 by an impeller adapter 14a or the like. The impeller 20 has a disk-shaped impeller body 21 whose central portion is attached to the lower end of the drive shaft 14 by the impeller adapter 14a and the like, and a plurality of generally U-shaped cross sections that extend radially upward from the upper surface side of the impeller body 21. Of the impeller blade 22.

A shutter mechanism 25 is arranged on the lower surface of the base plate 16, and an impeller cover 30 facing the upper surface of the impeller 20 is attached to the lower surface of the shutter mechanism 25.

A plurality of shutter mechanisms 25 are provided at equal intervals around the drive shaft 14, and in this embodiment, three discharge ports 26 are provided at equal intervals of 120 ° around the rotation axis 0 of the drive shaft 14.
a metering plate 26 having an opening a, a shutter 27 rotatably supported on the drive shaft 14 concentrically, and a shutter motor 2
8 and an interlocking gear 29 interposed between the shutter 27 and the shutter motor 28, and the interlocking gear 29 is controlled by forward / reverse control of the shutter motor 28 by remote operation from the transmitter.
By appropriately rotating the shutter 27 via, the respective discharge ports 26a of the metering plate 26 are interlocked to open and close. According to the opening / closing amount of the discharge port 26a, the powder-like scattered material stored in the main tank 18 is metered and supplied to the upper surface side of the impeller 20. Here, since the discharge ports 26a are arranged at equal intervals around the rotation axis 0, the impeller 20
Is supplied to the upper surface side of the in the circumferential direction in a balanced state.

On the other hand, the impeller cover 30 is detachably attached to the lower surface of the shutter mechanism 25 by bolts or the like and covers a disk-shaped upper surface cover 31 covering the upper surface side of the impeller 20, and extends along the outer periphery of the upper surface cover 31. It has a pair of side covers 32 and 33 that are provided and cover the outer periphery of the impeller 20.

The side covers 32 and 33 are spaced apart from each other, and have a conical surface shape that gradually shifts to the outside as the upper edges 32a and 33a connected to the peripheral edge of the upper cover 31 move downward. , Bottom edges 32b, 33b
Is the lower end of the impeller 20, that is, the peripheral edge 2 of the impeller body 21.
By setting below 1a, the impeller 20
Part of the scattered material released by the side cover 3
2 and 33 limit the sprayable distance. On the other hand, a part of the side covers 32, 33 is located between the side covers 32, 33.
By spraying without being limited to the sprayable distance in No. 3, the spraying range and the distribution state of the sprayed objects are adjusted.

Next, the concrete structure of the impeller cover 30 will be described with reference to FIGS. 6 and 7 schematically showing a plan view of the impeller cover 30.
6 is a partially cutaway B arrow view, FIG. 8 is a spraying range explanatory view showing a spraying range, and the like.

The diameter D of the upper cover 31 of the impeller 20 and the upper cover 31 of the impeller cover 30 are both 400 mm, the spraying height by the helicopter 1 is 5 m, and the side cover 3
In the spraying device 10 having a spraying performance, in which the sprayable distance of the sprayed product is not 10 and 30 m from the rotation center of the impeller 20, in the front-back direction from the drive shaft 14, that is, the rotation axis 0 of the impeller 20. 5 possible distances each
The case of setting m will be described as an example. The arrow F indicates the direction of rotation of the impeller 20.

Here, since the scattered matter discharged by the impeller 20 is discharged in a substantially horizontal direction along the tangential direction of the peripheral edge 20a of the impeller 20 and guided by the side covers 32 and 33, the scattered matter is scattered. The possible distance is determined by the angle of inclination of the side covers 32, 33.

Assuming that the inclination angle α is an angle formed by the horizontal line orthogonal to the rotation axis 0 of the impeller 20 and the side covers 32 and 33, the line segment a orthogonal to the rotation axis 0 and the rotation axis 0 are parallel. Line segment b, side covers 32, 33
In the right-angled triangle formed by the line segment a corresponds to the sprayable range, and the line segment b corresponds to the spraying height.

Therefore, in the present embodiment, the inclination angle α is set to 45 ° because the front-back direction spraying range is 5 m and the spraying height is 5 m.

On the other hand, as shown in FIG. 8, the radius R, which is the distributable distance of the scattered matter, from the rotational axis 0 of the impeller 20 is 10
The spray distance circle c of m is set, and this spray distance circle c and the direction in which the spray is to be restricted, that is, in the present embodiment, straight lines arranged parallel to each other at a position of 5 m forward and backward from the center of the rotation axis 0, respectively. Set the spreading distance lines d and e.

The outer circumference 20 of the impeller 20 is passed through the intersection points f and g of the spray distance circle c and the spray distance lines d and e, respectively.
The tangent lines h and i tangent to a are set, and similarly, the tangent line l and tangent line m which are tangent to the outer circumference 20a of the impeller 20 through the other intersections j and k of the spreading distance circle c and the spreading distance lines e and d are set. The side covers 32 and 33 are set such that the tangent line h and the tangent line i and the tangent line 1 and the tangent line m of the impeller 20 are separated from each other. That is, the side surface cover 32 is set between the tangent line m and the tangent line h, and the side surface cover 33 is set between the tangent line i and the tangent line l.

The impeller cover 30 set in this way
Is 7 ° in the rotation direction of the impeller 20 from the forward direction and 113 in the counter rotation direction on the disc-shaped upper surface portion 31 having a diameter of 400 mm.
The side cover 32 is provided with an inclination angle α of 45 ° over the angle of 45 °, and the inclination angle α is 45 ° over the range of 7 ° in the rotation direction of the impeller 20 from the reverse direction and 113 ° in the counter rotation direction. It is formed by providing the side cover 33.

The impeller cover 30 set in this way
In a state in which the sprayed material by the spraying device 10 having the above is balanced in the circumferential direction around the rotation axis 0 from the respective discharge ports 26a arranged at equal intervals around the rotation centerline 0 to the upper surface side of the impeller 20. Distributed and supplied, the outer circumference 2 of the impeller 20
It is tangentially emitted from the entire circumference of 0a.

In the range from the tangent line m to the tangent line h, the scattered matter discharged from the outer circumference 20a of the impeller 20 in the tangential direction is
The side cover 32 is brought into contact with the side cover 32 and guided according to the inclination angle α, and the scattering distance from the rotation axis 0 is within 5 m and the forward flight direction FWD is centered 120 forward of the rotation axis 0.
Mainly scattered within the fan shape of °. Similarly, tangent i to tangent l
The sprayed material discharged from the outer periphery 20a of the impeller 20 in the range of is contacted with the side surface cover 33 and guided according to the inclination angle α thereof, and the scattering distance from the rotation axis 0 is within 5 m and the area 120 is behind the rotation axis 0. It is mainly sprayed in a fan shape.

On the other hand, the sprayed material discharged in the tangential direction from the outer periphery 20a of the impeller 20 in the range from the tangent line h to the tangent line i is not affected by the presence of the side surface covers 32 and 33, and the side surface cover 32 and the side cover 33. Based on the spraying performance of the spraying device 10 in the one lateral direction from the gap between them, the spraying distance from the rotation axis 0 is within 10 m and is sprayed in a fan shape of 60 °. Similarly, in the range from the tangent line 1 to the tangent line m, the sprayed material discharged tangentially from the outer circumference 20a of the impeller 20 has a spraying distance within 10 m from the rotation axis 0 from the side cover 32, 33 to the other lateral direction. It is sprayed in a fan shape at 60 °. Therefore, the spraying range is within the spraying distance circle c having a radius of 10 m with the rotation axis 0 as the center, and is surrounded by the spraying distance lines d and e in the forward and reverse directions.
Is restricted within the range shown by the diagonal lines, and the side cover 3
The sprayed material that abuts and bounces off 2 and 33 is spreader 10
The droplets are concentrated and dropped around the center of the distribution, and the distribution of the distribution amount becomes a shape approximate to a normal distribution shape centered on the forward flight direction FWD.

FIG. 9 is a spraying performance / characteristic diagram of the spraying device 10, showing a spraying distribution state in which the spraying object is sprayed at a spraying height of 5 m, and the bar line shows the machine body 2 in one spraying flight. The distribution of the amount of spray is shown in the left-right direction when viewed from the front and the rear of the, and the interval between the bars is 1 m. In addition, the phantom line indicates the cumulative amount of spray when the spray flight is performed at the spray flight interval of 10 m.

As shown in this spraying performance / characteristic diagram, 1
The distribution of the amount of spraying per spraying flight has a spraying tendency that approximates to a substantially bilaterally symmetrical normal distribution shape. For example, FIG.
When spraying by reciprocating in parallel as shown in the outline of the spray flight path, the spray flight interval L is defined by the radius of the spray distance circle c,
That is, by spraying at a spray flight interval of 10 m,
As shown in FIG. 6B, the cumulative distribution amount distribution of the normal distribution shape distribution amount distribution Aa on the outward path A and the normal distribution shape distribution amount distribution Ba on the return path B becomes substantially constant as indicated by the virtual line C. It can be sprayed almost uniformly in the spraying area. In addition,
The spraying flight interval L is not limited to the radius of the spraying distance circle c, and by setting each spraying flight interval L to an arbitrary uniform interval, it is possible to spray the spraying area substantially uniformly.

As a reference, when the side covers 32 and 33 are removed and the sprayed material is sprayed at a spraying height of 5 m, as shown in the sprayability / characteristic diagram in FIG. 11, the sprayed amount distribution per sprayed flight is: In the front view and the rear view of the machine body 2, there is a tendency that the amount of spray is unevenly distributed to the left and right, and the spray flight interval L
Similarly, when reciprocating in parallel with 10 m which is the radius of the spray distance circle c and spraying, a large variation occurs in the spray as shown by the phantom line in FIG. Therefore, it can be confirmed that uniform spraying can be obtained by providing the side covers 32 and 33.

Therefore, the spraying device 10 according to the present embodiment.
According to the above, the scattered matter is supplied to the upper surface side of the impeller 20 in a state of being balanced around the rotation axis 0 from a plurality of discharge ports 6a arranged at equal intervals around the rotation axis 0, In addition, by providing a disk-shaped upper surface cover 31 that covers the upper surface side of the impeller 20 and side surface covers 32 and 33 that are separated from each other on the peripheral edge of the upper surface cover 31 and that are gradually shifted outward as they move downward. Impeller 20
A part of the dust released by the side covers 32 and 3
3 limits the sprayable distance and partially covers the part of the sprayed product discharged by the impeller 20.
By spraying without limiting the spraying distance from between, the spraying range of the sprayed products can be effectively limited, and the sprayed amount distribution state of the normal distribution tendency can be obtained, and uniform spraying without variation can be realized.

Further, the spread range is not affected by the rotation speed of the impeller 20, and the spread distance line d is equidistant from the rotation axis 0 in the front-rear direction by the inclination angle α of the side covers 32 and 33.
Since it is set between E and e, it is also always forwarded in one direction of the helicopter 1 and, for example, in forward / backward spraying in which forward and backward travels are repeated according to the spray flight path shown in FIG. Even when face-to-face spraying is performed by changing the direction of the helicopter 1 according to the spray flight route, the spray start timing of the sprayed objects can be set to a constant value without changing, and the spray start timing can be set within the spray area due to variations in the spray start timing. The imbalance of spraying can be suppressed, and the spraying operation remotely operated from the transmitter can be facilitated to improve the work efficiency. Further, by constantly making the spraying start timing substantially constant, spraying outside the spraying area is suppressed, and the influence of crop growth or the like outside the spraying area can be avoided.

Furthermore, since the side covers 32 and 33 are not vertical and are attached to the top cover 31 with an inclination angle α with respect to the rotation axis 0, the side covers 32 and 33 are discharged by the impeller 20 and come into contact with each other. It is possible to prevent the scattered matter from bouncing back to the impeller 20 side, and effectively prevent clogging caused by the scattered matter adhering to the impeller 20 and damage to the scattered matter caused by hitting the impeller 20 rotating at high speed. it can. Further, by changing the mounting direction of the impeller cover 30 and the mounting positions of the side covers 32 and 33 with respect to the upper cover 31, the spraying distance of the sprayed material can be arbitrarily changed.

On the other hand, when the side covers 32 and 33 are removed, the plurality of discharge ports 6a arranged at equal intervals around the rotation axis 0 are sprayed in a balanced state around the rotation axis 0. Since the material is supplied to the upper surface side of the impeller 20, the material to be scattered can be substantially evenly distributed in the circumferential direction without being affected by the rotation speed of the impeller 20.

Further, by making it possible to change the mounting direction of the impeller cover 30 with the rotation axis 0 as the center, it is possible to change the mounting direction of the impeller cover 30 and facilitate the spraying corresponding to the shape of the spray area. it can.

The present invention is not limited to the above-described embodiment, but can be variously modified without departing from the spirit of the invention. For example, although the diameter of the impeller 20 and the diameter of the upper surface cover 31 of the impeller cover 30 are set to be the same in the above embodiment, it is also possible to make the diameters of the impeller 20 and the upper surface cover 31 different depending on the required performance. In the embodiment, the inclination angle α of the side covers 32 and 33 is set to 45 °, but it can be set and changed to another arbitrary angle according to the spraying height and the spraying range. Further, in the above-described embodiment, the three discharge ports 26a are opened in the metering plate 26, but other plural discharge ports 26a may be arranged at equal intervals around the rotation axis 0.

Further, in the above embodiment, the spraying device mounted on the unmanned helicopter capable of wireless remote control has been described as an example, but the present invention can also be applied to a spraying device mounted on a manned helicopter on which an operator rides.

[0059]

According to the present invention described above, the scattered material is supplied from the plurality of discharge ports arranged at equal intervals around the rotation axis to the upper surface of the impeller in the circumferential direction about the rotation axis in a balanced manner. , Is uniformly emitted tangentially from the entire outer circumference of the rotating impeller, and is guided according to an inclination angle set so as to shift outward as it moves downward of the side cover, and the spraying distance is effectively set. Therefore, uniform spraying of the sprayed product can be obtained without the spraying direction being influenced by the rotational speed of the impeller.

Further, by disposing the pair of side covers with a gap therebetween, the sprayed material discharged by the impeller has a part in which the sprayable distance is limited by each side cover, while a part is spread on both sides. The sprayable distance from the face covers to the side covers is not limited, and the spread range and the distribution state of the spread amount are adjusted.

Further, in the case where the impeller cover is not used, the sprayed material is placed on the upper surface side of the impeller in a state of being balanced from the plurality of discharge ports arranged at equal intervals around the rotation axis and centered around the rotation axis. Since it is supplied, the sprayed material can be sprayed substantially uniformly in the circumferential direction without being affected by the rotational speed of the impeller.

[Brief description of drawings]

FIG. 1 is a side view of essential parts showing an outline of an embodiment of a helicopter spraying device according to the present invention.

FIG. 2 is likewise a front view.

FIG. 3 is likewise a plan view.

4 is a partially cutaway enlarged explanatory view of a portion A of FIG. 1.

5 is a bottom view showing a partially broken state of FIG. 4. FIG.

FIG. 6 is likewise a plan view schematically showing an impeller cover.

7 is a view similar to FIG. 6 showing a partially broken state of FIG.

FIG. 8 is likewise a spray range explanatory diagram showing a spray range.

FIG. 9 is likewise a scatterability / characteristic diagram.

FIG. 10 is likewise an explanatory view of dispersion, in which (a) is a schematic explanatory view of a dispersion flight path, and (b) is an explanatory view of a distribution of distribution.

FIG. 11 is likewise a scatter / characteristic diagram with the side cover removed.

FIG. 12 is an explanatory view of a spraying device mounted on a conventional helicopter.

[Explanation of symbols]

1 helicopter 2 Aircraft body 10 Spraying device 12 Impeller motor 14 Drive shaft 15 Support tube 16 base plate 17 Delivery tube 18 Main tank (scattering material tank) 19 sub tank 20 impeller 20a periphery 25 Shutter mechanism 26 Metering board 26a outlet 30 impeller cover 31 Top cover 32, 33 Side cover 32a, 33a Upper edge 32b, 33b Lower edge D Top cover diameter R Distributable distance α Side cover inclination 0 axis of rotation c Spread distance circle d, e Scatter distance line f, g, j, k The intersection of the scatter distance circle and each scatter distance line tangent to h, i, l, m A outbound route Aa Outbound spray amount distribution B Return Ba Backward spray amount distribution C Cumulative spray amount distribution L spray flight interval

Claims (6)

[Claims] 1. A tank that is detachably mounted on a main body of a helicopter and that stores powder-like scattered materials; and a rotary shaft that is arranged below the tank and extends vertically. An impeller and an impeller cover that covers the upper surface side of the impeller, and is detachably mounted on the main body of a helicopter that supplies and disperses the scattered material in the tank to the upper surface side of the impeller through a discharge port. In the helicopter spraying device, the impeller cover has a disc-shaped upper cover that concentrically covers the upper surface of the impeller, and an upper end coupled to a peripheral edge of the upper cover to cover a side surface of the impeller. And a side cover that restricts the spray distance by a conical surface that gradually shifts outward as it moves downward, and the discharge ports are compounded at equal intervals around the rotation axis. Spraying apparatus of the helicopter, characterized in that disposed. 2. The pair of side covers are arranged on the upper cover with a space therebetween.
The helicopter spraying device described in 1. 3. A spread distance circle having a radius that is a distributable distance by the impeller around the rotation axis and a pair of linear spread distance lines passing through a dispersal distance limited by a side cover. The helicopter spraying device according to claim 2, wherein a space between the side covers is set between tangents that pass through the intersections and contact the outer circumference of the impeller. 4. The helicopter spraying device according to claim 2, wherein the impeller cover is changeable in a mounting direction about the rotation axis. 5. The spreading distance lines are set to be equidistant from each other through the rotation axis and orthogonal to the forward flight direction of the helicopter and parallel to each other, and the spray distance lines are set parallel to each other. Helicopter spraying device. 6. A tank for removably mounting on a main body of a helicopter, a tank for storing powdery or granular scattered matter, and an impeller arranged below the tank and rotationally driven about a rotation axis extending vertically. In the spraying device for supplying the sprayed material in the tank to the upper surface side of the impeller through the discharge port and spraying the sprayed product, a plurality of the discharge ports are arranged at equal intervals around the rotation axis. A helicopter spraying device.