JPH0788410A - Chemical solution sprinkling apparatus - Google Patents

Abstract

PURPOSE:To well perform the adhesion of a chemical soln. to the rear surfaces of leaves or stalk parts over the whole of a sprinkling region by reducing the irregularity of the air quantity distribution between one end part of a boom and the other end part thereof. CONSTITUTION:A chemical soln. sprinkling apparatus has the boom 5 extending outwardly from a frame 1 and the chemical soln. sprinkling pipe 7 having a plurality of nozzles 6 and arranged along the boom 5 and a blade-shaped fan 8 having a large number of the blades extending along the boom 5 provided to the outer peripheral part thereof and sending air in the chemical soln. spraying direction from the nozzles 6 is provided to the boom 5 over the almost total length thereof and the irregularity of the air quantity distribution between one end part of the boom and the other end part thereof is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chemical liquid spraying device, and more particularly, to a chemical liquid having a boom extending outward from a frame and a chemical liquid spraying pipe having a plurality of solid nozzles and arranged along the boom. Regarding a spraying device.

[0002]

2. Description of the Related Art Conventionally, a chemical solution spraying device is arranged along a boom, and a chemical solution is sprayed from each nozzle of the chemical solution spraying tube so that a wide range of spraying can be performed. As shown in Japanese Patent Laid-Open Publication No. JP-A-2003-242, the frame supports a chemical liquid tank, a liquid pump for sucking the chemical liquid in the tank, and a blower having an impeller and a fan case, while the front end of the frame is supported. A fixed boom and a pair of outwardly extending movable booms that extend outward are provided on the fixed boom and each movable boom, and a chemical liquid sprayer having a plurality of nozzles is provided at predetermined intervals in the length direction of the boom. A pipe and a blower pipe having a large number of air outlets at predetermined intervals in the length direction of the boom are arranged, and the chemical liquid spray pipes are communicated with the discharge port of the pump, and Send one end Blower air that communicates with the air outlet of the fan case in the machine, sprays the chemical liquid sprayed from each nozzle of each chemical spray pipe on a wide range of crops, and blows the chemical liquid from each outlet of each blow pipe in the spray direction of the chemical liquid. It is known that the leaves of the crop are shaken to induce the spray liquid toward the inner side of the crop, and the spray liquid is attached to the back side of the leaves and the stem.

[0003]

However, in the chemical liquid spraying device configured as described above, the structure in which the chemical liquid is blown in the spray direction of the chemical liquid at the same time as the chemical liquid is sprayed has a long length extending to the outside of the frame. A blower pipe is arranged along the movable boom, and a frame-side base end portion of the blower pipe is communicated with a blower outlet of a fan case in a blower provided on the frame so that the blower pipe is connected to the blower pipe on the frame side. Since the air is sent to the tip side of the blower tube while blowing air to the outside, the wind pressure distribution over the entire length of the blower tube becomes uneven, and although the wind pressure is high on the frame side of the blower tube, the wind pressure is high on the tip side. As a result, the amount of air blown to the outside from the tip side outlet of the blower pipe is lower than the amount of air blown to the outside from the base side blower outlet, and the blower tube frame side outlet and tip end ~ side The variation in the air flow distribution between the outlet and the outlet becomes large, and the spray liquid can be guided to the inside of the crop well at the base side of the boom, but the spray liquid can be guided to the inside of the crop at the tip side of the boom. You will not be able to do well. Therefore, when the air volume is set so that the medicinal solution can be well adhered to the back side of the leaf and the stalk portion at the base side of the boom, the chemical liquid adhesion to the back side of the leaf and the stalk portion becomes worse as the tip side of the boom becomes closer. Becomes
There is a problem that the spraying effect deteriorates, and if the fan air volume is set on the basis of the air volume on the boom tip side, there is a problem that the air volume is too large on the boom base side and good chemical liquid cannot be attached.

An object of the present invention is to make it possible to reduce the variation in the air flow distribution from the root side to the tip side of the boom, and to perform good adhesion of the chemical liquid to the back side of the leaves and the stem over the entire spraying area. The point is to be able to.

[0005]

In order to achieve the above object, the invention according to claim 1 has a boom 5 extending outward from the frame 1 and a plurality of solid nozzles 6 along the boom 5. A blade fan 8 having a plurality of blades 81a extending along the boom 5 on the outer peripheral portion of the boom 5, and blowing air in the direction of spraying the chemical liquid from the nozzle 6. Is provided over almost the entire length of the boom 5.

Further, in the invention according to claim 2, the airfoil fan 8 is provided with an impeller 81 having a large number of blades 81a on an outer peripheral portion thereof.
And a fan case 82 having an air outlet 85, and the impeller 81 and the fan case 82 form the boom 5
It was formed over the entire length of Noho.

Further, the invention according to claim 3 is provided with a plurality of booms 5, and each of the booms 5 is provided with an airfoil fan 8 extending over substantially the entire length of each boom 5, and these airfoil fans 8 are independent. The driving means 9 for driving is provided.

[0008]

According to the first aspect of the invention, the boom 5 having the chemical spray pipe 7 is provided with the airfoil fan 8 for blowing the chemical spray from the nozzle 6 over the entire length of the boom 5. The variation in the air flow distribution between the base side and the front side of the boom 5 can be reduced, and the chemical liquid can be favorably adhered to the back side of the leaves and the stem portion over the entire spraying area, and the spraying effect is enhanced. It is possible.

According to the second aspect of the invention, the airfoil fan 8 is provided with an impeller 81 having a large number of blades 81a on its outer peripheral portion.
And a fan case 82 having a blow-out port 85, and the impeller 81 and the blow-out port 85 of the fan case 82 are formed to have a length over substantially the entire length of the boom 5. Boom 5 by blowing air from the outside
It is possible to form a continuous blown air layer (air curtain) over the entire length of the nozzle, and this continuous blown air layer can reduce drift and scattering of the spray liquid due to natural wind. Environmental pollution can be reduced.

According to the third aspect of the invention, a plurality of booms 5 are provided with airfoil fans 8 extending over substantially the entire length of each boom 5, and a drive means for independently driving these airfoil fans 8 is provided. Since 9 is provided, only a part of the booms 5 among the plurality of booms 5 can be used for spraying only a necessary portion according to the planting condition of the crop, etc., and the economical efficiency of spraying the chemical liquid can be improved. Further, since the airfoil fan 8 is driven independently, it is possible to easily adjust the air flow rate for each boom, and even when the boom 5 can be raised and lowered with respect to the frame, the fan drive system can be simplified. At the same time, the driving means 9 only needs to drive the fan necessary for the spraying, so that the power loss can be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The chemical liquid spraying apparatus shown in FIGS. 5 to 7 supports a chemical liquid tank 2 and a liquid pump 3 for sucking the chemical liquid in the tank 2 on a frame 1 which can be mounted on a tractor. A frame-shaped boom mount 10 is provided at the rear of the frame 1, and the frame 1 is attached to the rear surface of the boom mount 10.
Is provided with a fixed boom 4 extending in the lateral direction, and a pair of boom receivers 12 and 12 are pivotally supported on both ends of the boom mount 10 via vertical axes 11 and 11. , A pair of movable booms 5 and 5 extending outward of the frame 1 are pivotally supported by a horizontal shaft 13 so as to be capable of undulating, and a plurality of booms 5 and 5 extending along the length of each boom are provided. A chemical spray pipe 7 having individual nozzles 6,
An airfoil fan 8 for blowing air from the nozzles 6 in the direction of spraying the chemical liquid is provided over the entire length of each of the booms 4, 5, and one end of the fixed boom 4 and each of the movable booms 5 are provided.
And a drive means 9 (hereinafter referred to as a hydraulic motor) mainly composed of a hydraulic motor for independently driving each of the airfoil fans 8 is provided at the base of the.

The movable boom 5 shown in FIGS.
It is composed of a vertically long box-shaped base 51 connected to the boom receiver 12 via the horizontal shaft 13, and three rectangular pipes 52, 53, 54 extending laterally from a lower outside portion of the base 51. As shown in FIG. 2, these pipes 52 to 54 are connected to the front side of the base 51 in the vertical direction and to the base 5.
1 is disposed at the lower front-rear corner portion, each base end portion thereof is welded to the base 51, and each tip end portion is connected by a connecting plate 55, while the lengths of the pipes 52 to 54 are A first connecting body 56 that connects the upper pipe 52 and the lower front pipe 53 to the middle portion in the direction, the lower front pipe 53, and the lower rear pipe 54.
A second connecting body 57 having an H-shaped cross section for connecting the first pipe 51 and the second pipe 57 is attached at a predetermined interval in the length direction of each pipe, and the first pipe is provided between the upper end of the base 51 and the tip of the upper pipe 52. A reinforcing rod 58 is provided, and further, a plurality of second reinforcing rods 59 are provided between the lengthwise intermediate portion of the first reinforcement rod 58 and the lengthwise intermediate portion of the upper pipe 52.
The movable booms 5 have a truss structure to enhance rigidity.

Further, each airfoil fan 8 shown in FIGS.
2 to 4, the outer peripheral portion has a large number of blades 81a extending along the length direction of the booms 4 and 5, and the central portion is sucked from between the blades 81a. Through-flow passage 8 through which intake air flows in a direction perpendicular to the center of rotation
A cross flow type impeller 81, which has 1b, is configured to blow out from the outer peripheral portion through the flow passage 81b, between the suction side and the opposite side blade 81a, and a fan case 82.

A fan case 8 provided on the movable boom 5
2 are first and second case main bodies 82a and 82b having arc-shaped guide surfaces 820 facing the outer peripheral portion of the impeller 81 as shown in FIGS. 2 and 3, and these case main bodies 8
2a, 82b, and a guide 82c that faces the guide surface 820 and guides the air blown from between the blades 81a of the impeller 81 to an outlet 85 described later. As shown in FIG. 2, the first case main body 82a has an upper mounting portion 821 facing the upper pipe 52 of the movable boom 5 and a lower rear pipe 54 facing the lower rear pipe 54 on both ends in the arc direction of the guide surface 820. Each of the pipes 5 of the movable boom 5 has a substantially inverted L-shaped cross section with a side attachment portion 822.
2 to 54 are formed to have a length substantially the same as that of the upper pipe 52 and the lower rear pipe 54 via the mounting screws 14 and 14 respectively. A suction port 83 is provided between the portion 821 and the upper pipe 52 and the lower front pipe 53, and a net 84 is attached to the suction port 83, while the lower mounting portion 822, the lower rear pipe 54, and the derivative 82c are attached. The air outlet 85 is located between and. Further, the second case body 82b is formed in an arc shape having the guide surface 820 as shown in FIG. 3, and is attached to the lower side inside the base 51. A suction port 83 is provided, and an air outlet 55 is provided on the lower side surface of the base 51. Since there is the second connecting body 57 of the movable boom 5 at the outlet 85 portion on the side of the first case main body 82a, air will not be blown from this second connecting body 57 portion. Two
Since the connecting body 57 is formed to have a narrow width, it is possible to form a continuous blown air layer over almost the entire length of the movable boom 5 by blowing air from the blowout port 85 to the outside.

The guide 82c is formed to have a length substantially the same as that of the movable boom 5, and is arranged between the lower front pipe 53 and the lower rear pipe 54, and each second
As shown in FIG. 2, the upper surface 823 is attached to the connecting body 57 and is inclined upward from the outlet 85 side toward the suction port 83 side, and the front side surface 824 and the rear side surface 824 extending downward from both front and rear ends of the upper surface 823. The side surface 825 and the pair of mounting portions 8 protruding inward from the side surfaces 824 and 825.
26, and each mounting portion 826 is attached to the second connecting body 57 by the mounting screw 15.
Installed on.

Further, as shown in FIG. 2, the impeller 81 has the vanes 81a, a pair of end plates 81c connecting both ends of the vanes 81a, and the end plates 81c extending outward in the longitudinal direction. And a rotor shaft 81d that protrudes,
In the embodiment shown in FIG. 1 and FIGS. 5 to 7, a plurality of impellers 81 are arranged in series in the length direction of the movable boom 5 with respect to one movable boom 5, and the opposite sides of these impellers 81 are arranged. The one-side rotor shafts 81d located in the above are interlocked with each other via a coupling (not shown), and the one-side rotor shafts 81d are connected to the first and second connecting bodies 56, 57.
Is rotatably supported by a plurality of support plates (not shown) projecting from the first case body 82a toward the guide surface 820 of the first case body 82a via bearings and the coupling, while the plurality of impellers 81 The other side rotor shaft 81d of the impeller 81 arranged on the base side of the movable boom 5 is linked to the drive shaft of the hydraulic motor 9 via a coupling (not shown), and the tip of the movable boom 5 is Impeller 81 to be placed on the side
The other side rotor shaft 81d is connected to the connecting plate 5 of the movable boom 5.
5 is rotatably supported via bearings. A plurality of the impellers 81 may be formed for one movable boom 5, or one impeller 81 may be formed for each movable boom 5 so as to have a length substantially equal to the length of the movable boom 5. Good.

Further, three wind direction adjusting blades 86 extending along the length direction of the fan case 82 are provided in front of the air outlet 85 of the fan case 82 in the blowing direction so as to be able to adjust the angle, so that a natural nature at the time of spraying work can be obtained. It is preferable that the direction of air blown from the air outlet 85 can be adjusted by adjusting the angle of the wind direction adjusting blade 86 according to the wind direction and speed.

Further, the chemical solution spray pipe 7 shown in FIG.
Inside the derivative 82c, it is integrally formed with the derivative 82c, and a large number of nozzle mounting holes 72, which are radially outwardly opened from the liquid supply passage 71, are formed in the chemical spray pipe 7 at predetermined intervals in the longitudinal direction. The nozzle 6 is attached to these nozzle attachment ports 72. Further, each of the chemical liquid spraying pipes 7 has a liquid feeding pipe (not shown) at one end of the liquid feeding passage 71.
And an on-off valve (not shown) provided in the middle of the liquid supply pipe, the fluid is communicated with the discharge port of the pump 3. In addition, the chemical spray pipe 7 is formed separately from the derivative 82c,
For example, it may be attached to the second connecting body 57.

On the other hand, the fixed boom 4 is provided with an upper pipe 41, a lower front pipe 42, and a lower rear pipe 43, as shown in FIG. Connected by connecting plates 44 and 45, one connecting plate 4
5, the hydraulic motor 9 is attached. In addition, the fan case 82 of the airfoil fan 8 provided in the fixed boom 4
Like the fan case provided in the movable boom 5, has a circular arc guide surface 820, an upper mounting portion 821 and a lower mounting portion 822, and is mounted between the upper pipe 41 and the lower rear pipe 43. The main body 82d and the dielectric 82c arranged between the lower front pipe 53 and the lower rear pipe 54 are provided, and between the upper mounting portion 821 and the upper pipe 41 and the lower front pipe 42, The suction port 83 communicates with the outside through the frame-shaped boom mount 10, and the net 84 is attached to the suction port 83, while the lower mounting portion 822, the lower rear pipe 43, and the derivative 82 are attached.
An air outlet 85 is formed between c and c. Also, the impeller 81
Rotatably supports the rotor shafts 81d on both ends via bearings on the connecting plates 44 and 45, and the dielectric 82c penetrates the connecting plates 44 and 45 between the connecting plates 44 and 45. The chemical liquid spraying pipe 7 is provided inside the derivative 82c in the same manner as in FIG.

In the embodiment shown in FIGS. 2 and 4, the lower front pipe 53 of the movable boom 5 and the fan case 8 are provided.
A suction port 83 is also provided between the second derivative 82c and a net 87 is attached to the suction port 83 so as to increase the air volume, and the boom receivers 12 and the bases 51 of the movable booms 5 are connected to each other. In between, the undulating fluid pressure cylinder 1 that undulates each movable boom 5 between a horizontal position and an obliquely upper position.
6 is provided, and a rotating fluid pressure cylinder 17 for rotating the movable boom 5 erected by the fluid pressure cylinder 16 toward the front of the frame 1 is provided between the boom mount 10 and the boom receiver 12. It is provided.

Next, the operation of the embodiment configured as described above will be described.

The chemical liquid spraying device shown in FIGS. 1 to 7 is mounted on the tractor through the three-point link device of the tractor. When spraying work, the fluid pressure cylinders 16 and 17 are used. The movable booms 5 stored like 6 are extended to both sides of the frame 1. Then, the liquid pump 3 is driven to supply the drug solution sucked from the drug solution tank 2 to the drug solution spray pipes 7 of the booms 4 and 5, and sprayed from the nozzles 6 toward the lower crop, while the booms 4 are 5 drives the hydraulic motor 9 of the airfoil fan 8 provided in FIG. 5 to rotate the impeller 81 of each of the airfoil fans 8. In this case, each impeller 81 and the fan case 8
The blow-out port 85 is formed over the entire length of each of the booms 4 and 5, so that the amount of air blown from the blow-out port 85 to the outside can be changed from one end side to the other end side of the fixed boom 5. Also, it is possible to make the moving boom 5 substantially the same from the front side to the front side, and it is possible to reduce the variation in the air flow distribution over the entire length of each boom 4, 5. Therefore, the medicinal solution can be favorably adhered to the back side of the leaves and the stem portion over the entire spraying area, and the spraying effect can be enhanced, and moreover, over the entire length of each boom 4, 5. Since a continuous blown air layer (air curtain) can be formed, this air curtain can prevent the natural wind from passing through between the spray chemicals sprayed from each nozzle 6, and therefore the spray liquid by the natural wind can be prevented. Can be reduced and the environmental pollution due to the drift and scattering can be reduced. Also,
By adjusting the number of rotations of each hydraulic motor 9, the air volume from the air outlet 83 can be increased or decreased, so that the air volume can be adjusted according to the wind speed of natural wind or the growing condition of crops. Further, since the airfoil fan 8 provided with the cross-flow type impeller 81 is used, it is possible to reduce the noise caused by the fan during the spraying work, and the suction port 83 and the air outlet 85 of the airfoil fan 8 are Since each of the booms 4 and 5 is formed to have a length over the entire length and the cross-flow type impeller 81 is used, the booms 4 and 5 are not required to be used without using the large-diameter impeller 81. Since a large air volume can be obtained over almost the entire length, the chemical liquid can be more easily adhered to the back side of the leaves and the stem portion, and the drift of the spray liquid can be reduced.

Further, since the airfoil fans 8 provided on the booms 4 and 5 are independently driven by the hydraulic motors 9, the left and right movable booms 5 of the left and right movable booms 5 are selected according to the planting condition of the crop. As shown in FIG. 6, the one-side boom 5 is stored, and only the other-side boom 5 is extended outward from the frame 1 so that the spraying work can be performed only on a necessary portion, and the economical efficiency of spraying the chemical liquid can be improved. Further, since the hydraulic motor 9 is connected to each airfoil fan 8 and each airfoil fan 8 is driven independently, it is possible to easily adjust the air volume for each of the booms 4 and 5, and also to move each of the movable parts. Despite the structure in which the boom 5 can be raised and lowered with respect to the frame 1,
The fan drive system can be simplified, and since the hydraulic motor 9 only needs to drive the airfoil fan 8 necessary for spraying, power loss can be reduced.

In the embodiment described above, the air outlet 85 of the airfoil fan 8 is formed into a structure that is almost continuous over the entire length of the movable boom 5, and the air is blown from the air outlet 85 to the outside. At this time, a continuous blown air layer can be formed over almost the entire length of the boom 5, but it may be formed at intervals such that the continuous blown air layer cannot be formed. Further, in the above embodiment, the fixed boom 4 and each movable boom 5 are provided.
A hydraulic motor 9 is provided in and to drive the airfoil fans 8 of the booms 4 and 5 independently, but in addition, for example, one hydraulic motor is provided in the rear portion of the frame 1,
The impeller 81 of the airfoil fan 8 in the fixed boom 4 is interlockingly connected to the drive shaft of this hydraulic motor, while the drive shaft of the one hydraulic motor and the impeller 81 of the airfoil fan 8 in each movable boom 5 are linked. A power transmission mechanism having a meshing clutch is provided between and, and when the movable boom 5 falls down to the outside of the frame 1 as in FIG. The airfoil fan 8 is driven, and the movable boom 5 on one side is the same as in FIG. 6, or
When the movable booms 5 on both sides are stood up and stored, the engagement of the dog clutch may be disengaged and the drive of the airfoil fan 8 may be stopped independently.

Further, in the embodiment described above, a cross-flow type impeller is used as the impeller 81 of the airfoil fan 8. However, in addition to that, a large number of other blades extending in the longitudinal direction of the booms 4, 5 are provided on the outer peripheral portion. A sirocco which has blades, and has a through-flow passage through which suction air sucked from one end side in the length direction of the blade flows through at the center portion, and is blown from the outer peripheral portion through the through-flow passage between the blades. A shaped impeller may be used, or a centrifugal type impeller having a large number of blades on the outer peripheral portion and a rearward-facing blade configured to blow air in the circumferential direction without passing through the central portion may be used. .

Further, the movable boom 5 of the embodiment shown in FIGS. 1 to 7 is designed so that it can be raised and lowered only from the supporting portion to the frame 1, but in addition, it is not shown in Japanese Utility Model Publication 58-4981.
As disclosed in Japanese Patent No. 5 publication, the structure may include a base boom pivotally supported by the frame 1 and a tip boom pivotably supported at a tip end of the base boom. In this case, the chemical spray pipe 7 and the airfoil fan 8 are provided on each of the former boom and the former boom in a length extending over substantially the entire length of the former boom and the latter boom, and the base of the former boom and the former boom is provided. The hydraulic motor 9 is provided on the end side so that each airfoil fan 8 can be driven independently.

Further, the chemical liquid spraying device of the present invention may be of a type mounted on a tractor, or may be a traction type in which the frame is provided with wheels and is pulled by the tractor.

[0028]

As described above, according to the first aspect of the present invention, the boom 5 having the chemical spray pipe 7 is provided with the airfoil fan 8 for blowing the chemical spray from the nozzle 6 in the boom 5.
Since it is provided over the entire length of the boom, it is possible to reduce the variation in the air volume distribution from one end side to the other end side of the boom, and it is possible to spread the chemical liquid to the back side of the leaf and the stem part well over the entire spraying area. It can be done and the spraying effect can be enhanced.

According to the second aspect of the present invention, the airfoil fan 8 is formed by the impeller 81 having a large number of blades 81a on the outer peripheral portion and the fan case 82 having the outlet 85. Since the impeller 81 and the fan case 82 are formed so as to have a length extending over almost the entire length of the boom 5, a blown air layer (air curtain) continuous over the entire length of the boom 5 is formed.
The continuous blown air layer can reduce the drift and scattering of the spray chemical liquid due to the natural wind, and thus can reduce the environmental pollution due to the drift and spray of the spray liquid.

According to the third aspect of the present invention, the plurality of booms 5 are provided with the airfoil fans 8 extending over substantially the entire length of each boom 5, and the airfoil fans 8 are independently driven. Since the driving means 9 is provided, only a part of the booms 5 among the plurality of booms 5 can be used for spraying only a necessary part according to the planting condition of the crop, etc., and the economical efficiency of spraying the chemical liquid is improved. Furthermore, since the airfoil fan 8 is driven independently, it is possible to easily adjust the air flow rate for each boom, and even when the boom 5 can be raised and lowered with respect to the frame, a fan drive system can be used. In addition to being simple, the driving means 9 only needs to drive the fan necessary for the spraying, so that the power loss can be reduced.

[Brief description of drawings]

FIG. 1 is a rear view of only a main part of a chemical liquid spraying device of the present invention.

FIG. 2 is an enlarged cross-sectional view of the movable boom side portion of FIG. 1 taken along line XX.

FIG. 3 is an enlarged sectional view taken along line YY of FIG.

FIG. 4 is an enlarged sectional view of a fixed boom portion.

FIG. 5 is a rear view of the entire spraying device.

FIG. 6 is a plan view of a state in which one of the two movable booms is stored.

FIG. 7 is a side view showing a state in which two movable booms are stored.

[Explanation of symbols]

 1 Frame 5 Boom 6 Nozzle 7 Chemical Spray Tube 8 Blade Fan 81 Impeller 81a Blade 82 Fan Case 85 Air Outlet 9 Drive Means

Claims (3)

[Claims] 1. A boom (5) extending outward from a frame (1) and a chemical spray pipe (7) having a plurality of solid nozzles (6) and arranged along the boom (5). Prepare,
An airfoil fan (8) having a plurality of blades (81a) extending along the boom (5) on the outer periphery of the boom (5) and blowing in the direction of the chemical liquid spray from the nozzle (6).
Is provided over the entire length of the boom (5). 2. An airfoil fan (8) comprises an impeller (81) having a large number of blades (81a) on its outer peripheral portion, and an outlet (85).
2. A fan case (82) having a fan casing (82), wherein the impeller (81) and the fan casing (82) are formed to have a length over substantially the entire length of the boom (5). Chemical spraying device. 3. A plurality of booms (5) are provided, each of which is provided with an airfoil fan (8) over substantially the entire length of each boom (5). 3. The chemical liquid spraying device according to claim 1, further comprising a driving means (9) for independently driving the above.