JP3408769B2 - Spray for spraying granules - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray for spraying granules used when spraying granules such as herbicides and fertilizers from ridges such as paddy fields. It relates to a spray for spraying.

[0002]

2. Description of the Related Art Generally, a spray for spraying granules 4 is connected to a power spreader 10 as shown in FIG.
Used for spraying. Actually, as shown in the figure, an operator sprays the power spreader 10 from the back ridge 2 toward the paddy field 13.

As shown in FIG. 8, the granule spraying nozzle 4 is
It is used by being connected to the tip end side of a plurality of connecting injection pipes 5 that can be extended by adding them by connection. The connecting injection pipe 5 is provided with an injection port 19 which is formed at an intermediate predetermined position of the injection pipe so as to project inward and has an opening, and which guides and discharges the granule 3 in a predetermined direction. Spout 19
Is formed by mounting a guide plate 18 having a predetermined shape in an opening formed in a side wall of the connecting injection pipe 5 in a substantially trapezoidal shape. The guide plate 18 has a shape that is convexly curved and has a cross-sectional area that decreases toward the tip side, and has circular openings (not shown) for fixing the connecting plate 5 with the stoppers 9 on both end sides thereof. Equipped with.

In addition to the nozzle hole 19, the granule spraying nozzle 4 is formed so as to project inwardly in the middle of the nozzle nozzle through which the granules 3 are pumped, and the granules 3 are guided and discharged in a certain direction. First injection port 16 and a second injection port 17 that is open at the tip in the axial direction
With. The 1st nozzle 16 and the 2nd nozzle 17 are substantially trapezoidal as shown in FIG. The closer to the tip side,
The opening is formed so that the opening area of the injection port 17 is large.

[0005]

As described above, in the conventional spray for spraying granules, as shown in FIG.
Cross-section area S _{E of the} portion E where the pipe is narrowed by projecting inward
However, since it is smaller than the cross-sectional area S _F of the second injection port 17, the flow velocity (wind speed) of the transport wind at the cross-sectional area S _E portion of the first injection port 16 becomes faster than that at the cross-sectional area S _F portion. .
Thus, as shown in FIG. 11, the vortex 13 is generated by the turbulence inside the rear of the guide plate 18, and the cross-sectional area S _F
Is larger than the cross-sectional area S _E, there is a problem that the initial velocity at which the granules 3 are ejected from the second nozzle 17 is reduced and the flight distance of the granules 3 is not extended.

For example, as shown in FIG. 12, consider the case where the granules 3 are sprayed from both ridges 2 of the paddy field 13 having a standard width of 30 m in the paddy rice section. In the direction of the arrow in the figure, the operator carries the power sprayer 10 on his back and holds the granule spraying spout 1 in the direction perpendicular to the arrow, and walks over the granules 3 such as herbicides from the ridge 2 to the paddy field 13. Scatter. At this time, the worker's ridge 22
Ideally, the granules 3 can be evenly sprayed on the paddy fields 13 by the reciprocating movements.

However, among the granules 3, those having a small specific gravity, such as herbicides, which are susceptible to air resistance, do not extend the flight distance as compared with those having a large specific gravity, and therefore, as shown in FIG. The granules 3 do not reach the central part of the paddy field 13 and the granules 3 cannot be evenly distributed on the paddy field 13. For this reason, sufficient herbicidal effect cannot be obtained, and granules
Has to be sprayed or weeds must be manually removed, resulting in poor workability.

An object of the present invention is to solve the above problems and to provide a spray for spraying granules which increases the flight distance of granules.

[0009]

According to a first aspect of the present invention, there is provided a squirt tube (1) in which a granule (3) is pressure-fed.
And a first injection port (6) formed in the middle thereof so as to project inwardly so as to guide and discharge the granules (3) in a predetermined direction,
In a granule-dispersing jet (4) having a second jet port (7) opening at the tip in the axial direction, the cross-sectional area on the second jet port (7) side is defined by the inner side of the first jet port (6). It is characterized in that the cross-sectional area of the portion of the nozzle tube (1) which is minimized by the projection to the is almost equal to the sectional area.

With this structure, the spout for spraying granules (4)
The second jet port (7) side area which suppresses the attenuation of the flow velocity (wind velocity) of the carrier wind due to the turbulent flow due to the vortex of the granules (3) discharged from the second jet port (7) Since it is possible to prevent the deceleration of the wind speed due to the expansion of the above, it is possible to increase the initial velocity of the granules (3) from the second injection port (7) and increase the flight distance.

According to a second aspect of the present invention, in the second nozzle (7) side of the nozzle nozzle (1), the second nozzle nozzle (7) has the same cross-sectional area as the second nozzle hole (7). It is characterized in that it is provided with a tip extension portion (12) which is larger than at least the cross-sectional diameter of the nozzle hole (7) and is made to project on the tip side. With such a configuration, in the tip extension portion (12) of the cross-sectional area in which the flow disturbed by the change in the cross-sectional area at the first injection port (6) is made substantially equal to the cross-sectional area of the portion where the pipeline is the minimum, Since the flow is rectified and accelerated, the initial velocity of the granules (3) discharged from the second nozzle (7) can be increased and the flight distance can be dramatically increased.

The invention according to claim 3 of the present invention is characterized in that the cross section gradually becomes circular from the tip of the first nozzle (6) to the rear end of the tip extension (12).
In addition, from the tip of the first nozzle (6) to the tip extension (12)
It is preferable to make a circular cross section with a taper of about (25 to 50) / 100 toward the rear end.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an overall external view showing an embodiment of the present invention, FIG. 2 is a view showing a state in which granules are sprayed by a spray for spraying granules of the present invention, and FIG. 3 is a granule of the present invention. 5 is an exploded perspective view of the spray for spraying agent, FIG. 4 is a plan view of the spray head for spraying granules and a sectional view at positions A, B, C and D, FIG.
4 is a bottom view of FIG. 4, and FIG. 6 is a diagram for explaining a state in which granules are ejected from a granule spraying nozzle.

As shown in FIG. 1, the granule spraying nozzle 1 is
The outlet 3 of the blower driven by the engine of the power spreader 10.
0 is connected via a curved injection pipe 31 and a flexible pipe 32. Then, as shown in FIG. 2, the worker carries the power spreader 10 on his / her back, and the herbicide sent from the power spreader 10 under pressure,
Granules 3 such as fertilizer are discharged from a plurality of nozzles formed in the nozzle tube 1 and sprayed on the ridge 2.

The granule spraying nozzle 4 is, as shown in FIG.
It is used by being connected to the tip end side of a plurality of connecting injection pipes 5 that can be extended by adding them by connection. The connection injection pipe 5 is the same as the conventional one, and is provided with an injection port 19 which is formed at an intermediate predetermined position of the injection pipe so as to project inwardly and has an opening to guide and discharge the granules 3 in a predetermined direction. The injection port 19 has a substantially trapezoidal opening formed on the side wall of the connection injection pipe 5, and the guide plate 1 having a predetermined shape.
It is equipped with 8. The guide plate 18 has a shape that is convexly curved and has a cross-sectional area that decreases toward the distal end side.
At both ends thereof, circular openings (not shown) for fixing to the connecting injection pipe 5 by the stoppers 9 are provided.

As shown in FIG. 3, on the base end side and the tip end side of the connecting injection pipe 5, there are convex guide portions which are fitted into each other in the axial direction and are connected by rotating in the circumferential direction. A guide groove is formed. Although three connecting injection pipes 5 are used in the present embodiment, the number of connecting injection pipes 5 may be increased or decreased as needed. The guide plate 8 is separate from the nozzle head 1 and the connecting nozzle pipe 5 so that it can be replaced by wear.
You may make it integrally molded. In addition, the guide plate 8 is preferably made of a flexible rubber-based resin so that the granules 3 do not collide with the guide plate 8 and break when the granules are ejected.

As shown in FIG. 4, the granule spraying nozzle 4 is
The spray nozzle 1 into which the granules 3 are pressure-fed, the first spray nozzle 6 which is formed in the middle of the spray nozzles to project inwardly, and guides and discharges the granules 3 in a predetermined direction, and the tip end is opened in the axial direction. Second
And the injection port 7 of. In addition, the injection port 19 is also provided on the base end side. As shown in FIG. 5, the first nozzle hole 6 has a substantially trapezoidal shape when viewed from the lower surface side, and the proximal end side has a larger size in which the guide plate 8 projects inward than the distal end side. ing. Therefore, in FIG. 4, in the first injection port 6, the cross-sectional area S _{A at} the position A on the base end side is smaller than the cross-sectional area S _B at the position B on the tip end side.

According to the present invention, the cross-sectional area on the side of the second injection port 7 is made substantially equal to the cross-sectional area of the portion where the pipe line of the nozzle nozzle 1 is minimized by the inward projection of the first injection port 6. It is characterized by having done.

The diameter of the spray nozzle 4 for spraying granules on the second nozzle 7 side of the nozzle tube 1 is smaller than the diameter from the base end to the first nozzle 6. That is, the cross-sectional area of the second nozzle 7 side,
That is, the sectional areas S _C and S _{D at} the positions C and D in the figure
However, due to the projection of the guide plate 8 of the first injection port 6 into the interior of the nozzle nozzle 1, the pipe line is made to be substantially equal to the cross-sectional area S _{A at} the position of A, that is, the position A in the figure. In this embodiment, the cross-sectional areas S _C and S _D may be approximately equal to or slightly smaller than the cross-sectional area S _A. If the cross-sectional area S _D , which is the tip nozzle diameter, is made too small, the internal pressure of the nozzle nozzle 1 rises, the air volume increases, and the wind speed at the second nozzle 7 decreases, so the cross-sectional areas S _C , S _D should not be smaller than the area slightly smaller than the sectional area S _A.

Further, in the tip extension portion 12 on the side of the second injection port 7
The distance between CDs in a certain figure should be long to some extent and is preferable.
Specifically, the cross-sectional area S_C , S_D About twice the diameter of
It The length of the distance between the CDs is the first nozzle
Rectifies and accelerates turbulence due to cross-sectional area change in 6
This is because. The CD section of the tip extension 12 has a cross-sectional area S _A
 Same area or cross-sectional area S_A A little smaller area
Or the cross-sectional area S at C_A Same area as
Cross-sectional area S toward tip D_A A little smaller area
It may have a tapered shape. Also, the first
From the tip of the nozzle 6 to the rear end of the tip extension 12
Is gradually becoming circular. The first nozzle
From the tip of 6 to the rear end of the tip extension 12 (25-
50) / 100 (7-14 °) taper with circular cross section
Is preferred.

Next, the granules 3 in the spray for spraying granules 4
The discharge operation will be described. Pumped from power spreader 10
The granules 3 coming in are, as shown in FIG.
The second nozzle 7 in 4 guides the guide plate 8 in the axial direction.
Is ejected. The first nozzle hole 6 and the nozzle hole 19 of the guide plate 8
The liquid is discharged obliquely outward while being guided by the inclination. At this time, grain
The agent 3 is applied from the position A to the position B of the first nozzle 6 in the figure.
Turbulent flow such as vortex occurs in the area where the cross-sectional area increases
Is the cross-sectional area S at the C position on the second injection port 7 side. _C In the A position
Cross-sectional area S_A Down to the CD area of the tip extension 12
The flow is rectified and accelerated in the meantime.
Therefore, the granules are sprayed from the second nozzle 7 of the spray nozzle 4.
The speed of granules 3 can be increased and the flight distance can be increased.
Wear.

The improvement of the flight distance of the granule 3 will be described in detail below. Generally, the granules 3 discharged from the nozzles fly by the parabolic movement and eventually fall to the ground. According to the theoretical formula of the parabolic motion in which the air resistance when the granules 3 fly and the natural wind speed are ignored, the granules 3 are discharged from the nozzle of the granule spraying spout 1 according to the horizontal flight distance X. the initial velocity (proportional to the exit air velocity) _{V 0} of, when噴頭is to the angle between the horizontal direction _theta, given by the equation ^{X = (V 0 2 / g} ) sin2θ. From this theoretical formula, the flight distance in the horizontal direction is proportional to the square of the initial velocity V ₀ of the granule 3 if θ is constant,
The larger V ₀ is, the greater the flight distance is.

Therefore, according to the invention of the present application, the wind speed of the granules 3 discharged from the second nozzle 7 of the granule spraying nozzle 4 is attenuated by the turbulent flow due to the change in the sectional area of the first nozzles 6. Suppresses the tip extension 12 on the second injection port 7 side (CD section)
Since the initial velocity V ₀ of the granules 3 from the second nozzle 7 is increased as compared with the conventional jet head because the flow velocity X is proportional to the square of the initial velocity V ₀ , The flight distance of the granules 3 on the ridges 2 can be markedly improved.

Therefore, even if the granular material 3 has a shape such as a fertilizer or a herbicide which is hard to fly on the ridge 2, the granular agent 3 reaches beyond the central portion of the ridge 2, so that the granular agent 3 is There is no unprocessed part that is not sprayed. For this reason, since the granules 3 can be evenly sprayed on the paddy field 3, it is not necessary to manually spray the granules or weeding, and the workability is remarkably improved.

[0025]

As described above, according to the first aspect of the present invention, the cross-sectional area on the side of the second nozzle (7) is formed by the inward projection of the first nozzle (6). Since the cross-sectional area of the pipe section of the nozzle nozzle (1) is almost equal to that of the smallest part, the attenuation of the wind speed due to the turbulent flow of the granules (3) discharged from the second nozzle (7) is suppressed. In addition, it is possible to prevent deceleration of the wind speed as in the conventional case, and it is possible to increase the initial velocity of the granules (3) from the second injection port (7), so that the flight distance can be increased.

According to a second aspect of the present invention, the second nozzle (7) side of the nozzle nozzle (1) has the same cross-sectional area as that of the second nozzle (7) and the second nozzle (7). By providing a tip extension portion (12) which is larger than at least the cross-sectional diameter of the injection port (7) and projects the tip side, the flow distance of the granules (3) is increased by flow rectification and acceleration action. It can be improved significantly.

[Brief description of drawings]

FIG. 1 is an overall external view showing an embodiment of the present invention.

FIG. 2 is a diagram showing a state in which granules are being sprayed by the spray for spraying granules of the present invention.

FIG. 3 is an exploded perspective view of the spray for spraying granules of the present invention.

FIG. 4 is a plan view of the spray head for granule spraying and A, B, C,
It is sectional drawing in the D position.

FIG. 5 is a bottom view of FIG.

FIG. 6 is a diagram for explaining a state in which granules are discharged from a granule spraying nozzle.

FIG. 7 is a diagram showing a state in which granules are being sprayed by a conventional spray for spraying granules.

FIG. 8 is an exploded perspective view of a conventional spray for spraying granules.

9A and 9B are a plan view and a cross-sectional view at positions E and F of a spray for spraying granules.

FIG. 10 is a bottom view of FIG.

FIG. 11 is a view for explaining a state in which granules are discharged from the granule spraying nozzle.

FIG. 12 is a diagram illustrating a method of spraying granules on a ridge by a spray for spraying granules.

FIG. 13 is a diagram showing a relationship between a width direction of a ridge and a spray amount.

[Explanation of symbols]

1 spout tube 2 ridge 3 granules 4 Spray for spraying granules 5 connecting jet tubes 6 First nozzle 7 Second nozzle 8 information board 12 Tip extension

Claims (3)

(57) [Claims] 1. A squirt tube (1) into which a granule (3) is pressure-fed, and an opening projecting inwardly in the middle of the blast tube (1),
A first nozzle (6) for guiding and discharging the granules (3) in a predetermined direction
And a second spray nozzle (7) opening at the tip in the axial direction, in a granule spraying spray nozzle (4), the cross-sectional area on the second spray nozzle (7) side is the same as that of the first spray nozzle (6). A granule-dispersing blast nozzle characterized in that the cross-sectional area of a portion of the squirt tube (1) having a minimum diameter due to the inward projection is made substantially equal. 2. The second nozzle (7) side of the nozzle tube (1),
The cross-sectional area of the second nozzle (7) is almost the same, and the cross-sectional diameter of the second nozzle (7) is larger than at least the same.
The spray for spraying granules according to claim 1, further comprising a distal end extension portion (12) having a distal end protruding. 3. The granule spraying nozzle according to claim 2, wherein the cross section gradually becomes circular from the tip of the first nozzle (6) to the rear end of the tip extension (12). .