JPH0522281Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a chemical sprayer, and more particularly, to a chemical sprayer that mainly sprays powder to be put into a chemical tank.

(Prior Art) Conventionally, as described in Japanese Utility Model Publication No. 59-9710, this type of sprayer has a chemical tank, a fan case with a built-in fan and a ventilation passage, and a fan case that drives the fan. The chemical tank is arranged above the fan case, and a discharge port communicating with the ventilation passage is provided on the bottom of the tank, and a metering valve for opening and closing the discharge port is provided. A device is known in which the amount of medicine in the tank supplied to the ventilation passage is adjusted by a metering valve, and the medicine is sprayed from a dispersion port connected to the outlet of the ventilation passage.

However, since general powder agents contain a large amount of fine particles of, for example, 10 μm or less, there is a problem that when sprayed, the amount of drifting and scattering is large, reducing the spraying effect.

Therefore, in recent years, there has been a trend to reduce the amount of drifting and scattering, for example, by using powders with a small amount of fine particles of 10 μm or less and an average particle size of 20 μm or more.

(Problems to be solved by the invention) However, in the case of a powder with a reduced amount of drifting and scattering, there was a problem that bridging occurred more easily in the vicinity of the communication hole in the drug tank than with the above-mentioned general powder. This bridging occurs when the powder at the bottom of the tank is compacted by the load of the powder put into the tank, and due to this bridging, the powder in the tank cannot be delivered even if the metering valve is opened. It becomes impossible to do so.

The purpose of this invention is to use a simple structure to prevent the formation of blisters in the drug tank, even if the powder has a reduced amount of drifting and scattering. By introducing the tank into the tank, the powder in the tank can be efficiently delivered to the discharge port, and the loss of pressurized air due to the drive of the fan can be reduced.

(Means for Solving the Problems) Therefore, in the present invention, a drug tank 5 having a horizontally long bottom surface 51 is arranged above a fan case 3 having a built-in fan 2 and a ventilation passage 6. death,
A branch passage 60 is provided between the bottom surface 51 of the tank 5 and the ventilation passage 6, which branches from the rear side of the ventilation passage 6 in the ventilation direction and whose branch tip communicates with the front side of the ventilation passage 6 in the ventilation direction. The chemical sprayer is provided with a metering valve 8 in which the bottom surface 51 is connected to the branch passage 60, and a metering valve 8 is provided in this communication part,
At the bottom surface 51 and on one side in the length direction of the bottom surface 51, the air in the branch passage 60 is transferred to the tank 5.
An air inlet 11 for introducing air into the tank 5 is provided, and an outlet 7 is provided on the other side, while a bridging prevention body 12 is provided above the air inlet 11 and the outlet 7 in the tank 5 to prevent bridging. A guiding surface 12a is provided on the bottom surface of the body 12 and between the air inlet 11 and the outlet 7 for guiding the air introduced into the tank 5 from the air inlet 11 toward the outlet 7. It was established.

(Function) Air inlet 11 and outlet 7 in the tank 5
A bridging prevention body 12 is provided at an upper position,
Air inlet 11 and outlet 7 provided on the bottom of the tank
The load of the powder agent in the tank that acts toward the air is absorbed by the bridging prevention body 12, and the powder agent is prevented from falling to the bottom surface. This makes it possible to prevent the bridging phenomenon of powder agents from occurring.

An air inlet 11 is provided on one lengthwise side of the horizontally elongated bottom surface 51, and an outlet 7 is provided on the other side, and the air inlet 11 is provided on the bottom surface of the bridging preventer 12. A guide surface 12a is provided at the bottom of the tank 5 to guide the air introduced into the tank 5 toward the discharge port 7, so that the air flows in a parabolic shape from one side to the other in the length direction of the bottom. Even if the amount of air introduced into the tank is small, the powder in the tank can be sent out from the discharge port 7 to the branch passage 60 by the parabolic air flow. Moreover, by providing the guiding surface 12a as described above,
The introduced air introduced into the tank is guided to the discharge port to form a parabolic air flow, and the air is smoothly discharged from the discharge port. The flow resistance of air can be reduced, and the amount of air introduced into the tank can be reduced, and the introduced air can pass from the discharge port 7 through the branch passage 60 and exit from the dispersion port on the outlet side of the ventilation passage 6 to the outside. Since the drop in air pressure during discharge can be reduced, the pressure loss of the air pressurized by the drive of the fan can be reduced, and the drop in the ability to spread the powder from the dispersion port can be reduced.

(Example) The illustrated spreading device has a fan 2 built into the lower part of a backpack frame 1, supports a fan case 3 having a ventilation passage 6, and drives the fan 2 to the fan case 3. In addition to attaching the engine 4, a drug tank 5 having a horizontally long bottom surface 51 is supported on the upper part of the backpack frame 1, and between the bottom surface 51 of the tank 5 and the ventilation passage 6,
As shown in FIG. 1, the ventilation passage 6 branches from the rear side in the ventilation direction, and the tip of the branch is the ventilation passage 6.
A branch passage 60 is provided that communicates with the front side in the air blowing direction, and the bottom surface 51 is made to communicate with the branch passage 60, and a metering valve 8 is provided in this communication portion. A backpack-type drug dispersion device configured to supply the drug from the communication portion to the branch passage 60, merge the drug into the ventilation passage 6 from the outlet of the branch passage 60, and spray from the dispersion port connected to the outlet of the ventilation passage 6. It is a machine.

In the embodiment shown in FIGS. 1 to 5, the air in the branch passage 60 is introduced into the tank 5 at the bottom surface 51 of the tank 5 and on one side in the length direction of the bottom surface 51. An air inlet 11 is provided and an outlet 7 is provided on the other side, and a bridging preventer 12 is provided in the tank 5 at a position above the air inlet 11 and the outlet 7. Moreover, a guiding surface 12a is provided between the air inlet 11 and the outlet 7 to guide the air introduced into the tank 5 from the air inlet 11 toward the outlet 7. . still,
The air inlet 11 and the outlet 7 are communicated with each other as shown in FIG. 1, and the metering valve 8 is formed to open and close the air inlet 11 and the outlet 7.

In the above configuration, the bridging prevention body 12
The guiding surface 12a is provided on the bottom surface, and the inverted V is provided on the top surface.
It is formed into a block shape with a letter-shaped sliding surface 12b, and its both sides are supported at the bottom of the tank 5 via a pair of support pieces 13 and 14. Further, the guide surface 12a is inclined downward in the vertical direction from one end side of the metering valve 8 to the other end side.
Note that one support piece 13 is fixed to the tank 5 via a set screw 15, and the other support piece 14 is fixed to the tank 5 through a set screw 15.
It fits into a support pin 16 erected at the bottom of the tank 5.

Further, the metering valve 8 is formed into a rectangular shape by a flat plate, and is disposed in the branch passage 60, and one end and the other end of the metering valve 8 are connected to the first and second arms 9, It is supported on the fan case 3 via 10. The second arm 10 is formed to have a length approximately twice as long as the first arm 9, and the metering valve 8 is moved to the second arm 10 by rotating the second arm.
The first arm 9 is configured to rotate along a radius of curvature between a pivot point to the fan case 3 and a pivot point to the metering valve 8, and has one end pivoted to the fan case 3. is oriented in the opposite direction to the second arm 10 and is pivotally connected to the other end of the metering valve 8, and the metering valve 8 is aligned with the pivot point of the first arm 9 to the fan case 3. It is moved and rotated along the radius of curvature between the pivot point to the quantity valve 8 and the pivot point.

Further, a pivot shaft 17 supporting the second arm 10
A metering operation lever 18 is connected to the unit, and the second arm 10 is rotated by operating the lever 18.

In the illustrated spreader, an air blowing tube 19 that opens toward the bottom of the tank 5 is attached to the support piece 14 of the bridging preventer 12, and the free end of this tube 19 is connected to the blowing passage 6. Although the tube 19 is opened to blow the air from the ventilation passage 6 onto the bottom surface of the tank 5 so that no drug remains on the bottom surface, the tube 19 is not necessarily required.

The present invention is constructed as described above, and a bridging prevention body 12 is provided above the air inlet 11 and the outlet 7 in the tank 5, and the air inlet 11 and the outlet 7 are provided at the bottom of the tank. The load of powder in the tank acting on the bridging preventer 12
Since it is possible to prevent the powder from falling to the bottom surface, it is possible to prevent the bridging phenomenon of the powder from occurring above the air inlet 11 and the outlet 7.

In addition, when discharging and dispersing the powder put into the chemical tank 5 from the dispersion port connected to the outlet of the ventilation passage 6, the fan 2 is driven and the metering operation lever 18
The metering valve 8 is operated to open the air inlet 11 and the outlet 7, and by opening the air inlet 11 and the outlet 7, the air in the branch passage 60 branched from the ventilation passage 6 is removed. is introduced into the tank 5 from the introduction port 11. The air introduced into this tank is
It is applied to the guide surface 12a of the bridging preventer 12, guided toward the discharge port 7 by the guide surface 12a, and discharged from the discharge port 7 into the branch passage 60. Therefore, at the bottom of the tank 5,
Since it is possible to form a parabolic air flow from one side to the other in the length direction of the bottom, even if the amount of air introduced into the tank is small, the parabolic air flow can sweep the powder in the tank. This allows the discharge port 7 to be sent out to the branch passage 60 in a good manner.

Moreover, by providing the guiding surface 12a as described above,
The introduced air introduced into the tank is guided to the outlet to form a parabolic air flow, and the air is smoothly discharged from the outlet. The flow resistance of air can be reduced, and the amount of air introduced into the tank can be reduced, and the introduced air can pass from the discharge port 7 through the branch passage 60 and exit from the dispersion port on the outlet side of the ventilation passage 6 to the outside. Since the drop in air pressure during discharge can be reduced, the pressure loss of the air pressurized by the drive of the fan can be reduced, and the drop in the ability to spread the powder from the dispersion port can be reduced.

Further, since the upper surface of the bridging preventer 12 is inclined in an inverted V shape, powder does not remain on the upper surface of the bridging preventer 12.

Moreover, since an air blowing tube 19 is provided at the bottom of the tank 5 at a position displaced from the communication hole 7, even if the amount of powder in the tank 5 decreases, this powder will not be It does not remain on the bottom of the tank.

In the above embodiments, the metering valve 8 has a structure in which it operates via the first and second arms 9 and 10, but in addition, the metering valve 8 has the following configurations:
The structure may be such that it operates via one second arm 10, or may be a structure in which it slides, and the structure is not particularly limited. When the metering valve 8 has a slide-through structure, for example, as shown in FIGS. The introduction port 11 is closed when the communication hole 7 is closed, and the introduction port 11 is opened when the communication hole 7 is opened, and a bridging prevention body 12 having a curved guiding surface 12a is used.

Further, the spreader of the present invention may be a backpack-type spreader or a spreader mounted on or towed by a tractor.

(Effect of the invention) As described above, according to the invention of the present application, the bridging prevention body 12 provided above the air inlet 11 and the outlet 7 in the tank 5 prevents bridging of powder at the inner bottom of the tank. While I could, that is.
Air inlet 11 and outlet 7 provided on the bottom of the tank
The load of the powder agent in the tank acting toward While preventing the bridging phenomenon from occurring and the powder in the tank not being able to be delivered even if the metering valve is opened,
An air inlet 11 is provided on one lengthwise side of the horizontally elongated bottom surface 51, and an outlet 7 is provided on the other side, and the air inlet 11 is provided on the bottom surface of the bridging preventer 12 from the air inlet 11 to the tank. a guiding surface 1 that guides the air introduced into the interior 5 toward the discharge port 7;
2a so that a parabolic air flow can be formed at the bottom of the tank 5 from one side to the other in the length direction of the bottom, so the amount of air introduced into the tank is small. Also, the powder in the tank can be efficiently delivered from the discharge port 7 to the branch passage 60 due to the parabolic air flow.

Moreover, by providing the guiding surface 12a as described above,
The introduced air introduced into the tank is guided to the outlet to form a parabolic air flow, and the air is smoothly discharged from the outlet. The flow resistance of air can be reduced, and the amount of air introduced into the tank can be reduced, and the introduced air can pass from the discharge port 7 through the branch passage 60 and exit from the dispersion port on the outlet side of the ventilation passage 6 to the outside. Since the drop in air pressure during discharge can be reduced, the pressure loss of the air pressurized by the drive of the fan can be reduced, and the drop in the ability to spread the powder from the dispersion port can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an embodiment of the spreader of the present invention, and Fig. 2 is a partially cutaway side view.
FIG. 3 is a front view of only the bridging preventer, FIG. 4 is a bottom view of the same, FIG. 5 is a side view of the same, and FIGS. 6 and 7 are explanatory views showing another embodiment. 2... Fan, 3... Fan case, 5... Drug tank, 51... Bottom, 6... Ventilation passage, 60
... Branch passage, 7 ... Discharge port, 8 ... Metering valve, 1
1...Air inlet.

Claims (1)

[Scope of utility model registration request] A drug tank 5 having a horizontally long bottom surface 51 is disposed above a fan case 3 having a built-in fan 2 and a ventilation passage 6, and between the bottom surface 51 of this tank 5 and the ventilation passage 6 , the ventilation passage 6
A branch passage 60 is provided which branches from the rear side in the air blowing direction and whose branch tip communicates with the front side of the air blowing direction of the air blowing passage 6, and the bottom surface 51 is made to communicate with the branch passage 60, and a metered meter is provided in this communication portion. A chemical sprayer provided with a valve 8, the bottom surface 51, and
The branch passage 6 is provided on one side in the length direction of the bottom surface 51.
An air inlet 11 for introducing zero air into the tank 5 is provided, and an outlet 7 is provided on the other side, while the air inlet 11 and the outlet 7 in the tank 5
A bridging prevention body 12 is provided above the bridging prevention body 12, and air is introduced into the tank 5 from the air inlet 11 at the bottom of the bridging prevention body 12 and between the air inlet 11 and the discharge port 7. A chemical spraying machine characterized by being provided with a guiding surface 12a for guiding air toward the discharge port 7.