JP2001149821A - Static electricity imparting spreader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spreader for imparting static electricity which is able to surely avoid an electric shock accident by a static electricity imparting electrode, when a spraying of a liquid chemical is stopped. SOLUTION: In the static electricity imparting spreader which spreads the liquid chemical 1 by imparting an electrical charge from a static electricity imparting electrode 19 to the liquid chemical 1 jetted from a spray nozzle 5, the supply of electrical power to the static electricity imparting electrode 19 is stopped by operating a pressure switch 16 when the pressure of the liquid chemical 1 supplied to the spray nozzle 5 is lowered to a set point or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic spraying machine which imparts an electric charge to a sprayed chemical such as a pesticide so that the chemical can be sufficiently adhered to a cultivated plant or the like.

[0002]

2. Description of the Related Art Conventionally, in front of a spray nozzle,
2. Description of the Related Art An electrostatic spraying type sprayer having a ring-shaped or the like electrostatic applying electrode for applying a high voltage is provided. In this electrostatic spraying machine, a liquid such as a pesticide to be sprayed is given a charge from the electrostatic spraying electrode in an atomized state and exits into a free space, so that the atomized chemical liquid is sprayed. Has good adhesion to agricultural crops and the like, whereby effects such as pest control and sterilization can be enhanced.

[0003] Incidentally, since such a conventional electrostatic sprayer is generally used outdoors, a portable battery is used as a power source for driving the sprayer, and the DC voltage of the battery is increased to a high voltage by a booster circuit. The pressure is increased and applied to the spraying electrode, and the chemical solution from the spray nozzle is charged as described above.

In a conventional electrostatic spraying machine, switching between supply and stop of supply of a chemical solution from a pump to a spray nozzle and supply and stop of supply to a high-voltage electrostatic electrode are controlled by a cock and an electric switch. , Each being operated independently.

[0005]

However, in such an electrostatic spraying machine in which the switching of the cock of the chemical solution and the switching of the high voltage are performed independently as described above,
For example, in order to temporarily suspend the spraying operation, the cock is closed and the injection of the chemical solution from the nozzle is stopped, but if the switching operation (opening operation) of the changeover switch is forgotten, a part of the body of the worker is lost. However, in some cases, the spraying electrode may be inadvertently exposed to a spraying electrode being applied with a high voltage (for example, 10 kV to 20 kV). In this case, there is a problem that an electric shock is caused and a strong shock is received. Was.

The present invention has been made to solve the above-mentioned problem. After the operation such as spraying a chemical solution is stopped, even if a human body touches the electrostatic electrode, static electricity accidents can be reliably avoided. It is an object of the present invention to provide an electric sprayer.

[0007]

To achieve the above object,
The electrostatic spraying device according to the first aspect of the present invention is an electrostatic spraying device that sprays a chemical solution ejected from a spray nozzle by applying an electric charge from an electrostatic spraying electrode to the spray solution. When the pressure of the chemical supplied to the electrode is detected to drop below a set value, the pressure switch is operated to cut off the power supply to the electrostatic application electrode. In this way, even if the spraying of the chemical solution is temporarily interrupted, etc. Accidents can be avoided before they happen.

Further, in the electrostatic spraying device according to the second aspect of the present invention, the pressure switch is provided on a downstream side of a main cock interposed in a pipe from a chemical liquid supply pump to the injection nozzle, Here, the pressure of the chemical supplied from the pump via the main cock is detected.

According to a third aspect of the present invention, in the electrostatic spraying type sprayer, the main cock has a single inlet connected to a pipe from the pump, and one outlet connected to the spray nozzle. And a three-way cock whose other outlet is connected to a pipe leading to the chemical solution tank.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram showing a hydraulic system and an electric system of an electrostatic spraying type spreader according to an embodiment of the present invention. First, the hydraulic system includes a chemical tank 2 for storing a chemical 1 such as an agricultural chemical, a chemical supply pump 4 for sucking a chemical from the chemical tank 2 through a suction pipe 3, and a pump 4.
And a three-way cock 6 as a main cock for supplying a pressurized chemical solution to a plurality of spray nozzles 5 arranged on a spraying boom (not shown).

The three-way cock 6 has a single inlet 6a to which a chemical solution is supplied, connected to the pump 4 via a discharge pipe 7, and one outlet 6b connected to the spray pipe 13, the hose 9, and the The nozzles 10 are connected to the spray nozzles 5 through nozzle pipes 10 made of metal or the like provided along the spraying boom connected to the spraying boom, and the other outlet 6 c is connected to the inside of the chemical liquid tank 2 through a return pipe 8. Is led to. In addition,
The three-way cock 6 operates such that when one outlet 6b is opened, the other outlet 6c is closed.

Between the pump 4 and the return pipe 8, a pressure regulating valve 11 which opens when the discharge pressure of the pump 4 exceeds a set range is interposed. Reference numeral 12 shown in FIG. 1 is a strainer provided at an end of the suction pipe 3 connected to the pump 4 for filtering dust and the like mixed in the chemical solution 1. The hose 9 is connected to the one outlet 6 b of the three-way cock 6 through the spray pipe 13.
It is connected to the.

On the other hand, the electric system includes a portable battery 14 serving as a DC power supply, a main power switch 15 connected to the battery 14, and a pressure switch 16 connected in series to the power switch 15. The battery 14 via the power switch 15 and the pressure switch 16
And a plurality of electrostatic applying electrodes 19 connected to the output side of the booster circuit 17 via a high-voltage cable 18 and arranged in correspondence with the nozzle 5.
And

Here, the pressure switch 16 is a pressure on the one outlet 6b side of the three-way cock 6;
The operation is performed by introducing the pressure at the connection portion between the hose 9 and the spray pipe 13. That is, when the pressure of the chemical solution 1 rises on the one outlet 6b side and reaches a set level, it closes (ON), and opens below this set level (OF).
The operation F) is performed.

The spray nozzle 5 and the plurality of electrostatic applying electrodes 19 are fixed to a mounting plate 21 as shown in FIG. I have. Thereby, the electric charge can be efficiently applied to the atomized chemical liquid by the high voltage generated by the electrostatic applying electrode 19 to the chemical liquid ejected from the spray nozzle 5. In addition, the electrostatic application electrode 19
Has a form in which the end of the electrode rod 19b slightly protrudes from the tip of the electrode holder 19a made of an insulating material, and is configured to be as hard as possible to touch the human body. Further, the electrode rod 19b is provided on the oblique cut surface 1 of the electrode holder 19a.
By 9c, it is made to face the chemical spraying side sprayed from the spray nozzle 5.

Next, the operation will be described. In the case of spraying a chemical solution using the electrostatic sprayer of the illustrated example, first, a power source such as a motor or an engine (not shown) is driven to operate the pump 4 and the main power switch 15. Turn ON. By the operation of the pump 4, the chemical 1 in the chemical tank 2 is transferred to the suction pipe 3, the pump 4, the discharge pipe 7, the three-way cock 6.
Through the other outlet 6c and the return pipe 8
It is returned to the chemical solution tank 2.

Next, at a timing when the discharge pressure of the pump 4 is considered to be stable, the three-way cock 6 is switched, and the one outlet 6b of the three-way cock 6 is opened. Thereby, the chemical 1 discharged from the pump 4 is supplied to the spray pipe 13, the hose 9, and the nozzle pipe 1.
0, the liquid is supplied to all the spray nozzles 5 at the same time, and the chemical liquid is ejected from the plurality of spray nozzles 5.

On the other hand, the pressure switch 16 monitors the pressure on the one outlet 6b side of the three-way cock 6,
When the pressure exceeds a set value, that is, when the appropriate spraying of the chemical solution is performed, the pressure is closed for the first time. For this reason, the power of the battery 14 is supplied to the booster circuit 17 via the main power switch 15 and the pressure switch 16, and the high voltage boosted by the booster circuit 17 is applied to all of the electrostatic application electrodes. 19 is applied.

For this reason, the electric charge generated by the electrostatic application electrode 19 is applied to the chemical liquid ejected from each of the spray nozzles 5 as described above, and the spray chemical liquid effectively adheres to, for example, vegetables. Becomes As a result, it is possible to reliably perform control and sterilization of pests on the vegetables and the like.

On the other hand, in order to temporarily stop the spraying of the chemical solution, the three-way cock 6 is operated, and when the supply of the chemical solution 1 to the spray nozzle 5 is stopped, the one-way cock of the three-way cock 6 is stopped. The pressure on the outlet 6b side, that is, the pressure in the spray pipe 13 decreases. When this pressure falls below a set value, the pressure switch 1 monitoring this pressure
6 is automatically opened, and the power supply from the battery 14 to the booster circuit 17 is cut off. For this reason, the boosting circuit 17 outputs all the electrostatic application electrodes 1
The application of high voltage to 9 is automatically shut off.

As a result, there is no danger of electric shock even if any part of the worker's body comes into contact with any of the aforementioned electrostatic applying electrodes 19 when the application of the chemical solution is interrupted. In addition, when the pressure of the chemical solution decreases as described above, the supply of the high voltage to the spray nozzle 5 is shut off.
The wetting of the electrostatic application electrode 5 can be reduced.

[0022]

As described above, according to the present invention, there is provided an electrostatic spraying type sprayer which sprays a chemical solution sprayed from a spray nozzle by spraying by applying a charge from an electrostatic spraying electrode. When the pressure of the chemical solution supplied to the nozzle drops below a set value, the pressure switch is operated to cut off the power supply to the electrostatic application electrode, so that the application of the chemical solution is temporarily stopped. For example, when the power switch is forgotten to be turned off in spite of stopping the spraying, the electric shock can be reliably prevented even if the human body touches the electrostatic applying electrode. Can be

Further, according to the present invention, the pressure switch is provided downstream of a main cock provided in a pipe from the chemical liquid supply pump to the injection nozzle, and the pressure switch is provided from the chemical liquid supply pump to the main cock. When the supply pressure of the chemical solution to the spray nozzle becomes equal to or lower than a set level by detecting the pressure of the chemical solution supplied via the, the high voltage supply to the electrostatic applying electrode is stopped by one pressure switch It is possible to avoid an electric shock accident due to an electrostatic electrode to which a high voltage is supplied as in the related art.

According to the invention, the main cock has a single inlet connected to a pipe from the chemical supply pump, and one outlet connected to a pipe leading to the plurality of injection nozzles, Since the other outlet is a three-way cock connected to a pipe leading to the chemical liquid tank, the supply pressure of the chemical liquid to the spray nozzle can be adjusted to an optimum value while controlling the return amount of the chemical liquid to the chemical liquid tank. Is also obtained.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an electrostatic spraying type sprayer according to an embodiment of the present invention.

FIG. 2 is a diagram showing a related structure between a spray nozzle and an electrostatic electrode according to the present invention.

[Explanation of symbols]

 4 Chemical liquid supply pump 5 Spray nozzle 6 Three-way cock (main cock) 6a Main cock inlet 6b One outlet of main cock 6c The other outlet of main cock 7 Discharge pipe 8 Return pipe 9 Hose (pipe) 10 Nozzle pipe 13 Spray Piping 16 Pressure switch 19 Electrostatic electrode

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shun Yamane 1 678 Tomioka, Toyotamachi, Iwata-gun, Shizuoka Prefecture Inside the Agricultural Experiment Station in Shizuoka Prefecture (72) Yoshiaki Hironaka 1-7-2 Suehirocho, Ome-shi, Tokyo Kyoritsu Co., Ltd. (72) Inventor Tadashi Ishimura 1-7-2, Suehirocho, Ome-shi, Tokyo F-term (reference) 2B121 CB10 CB13 CB25 CB42 CB47 CB53 EA21 FA15 4F034 AA07 BB04 BB21 DA18 DA22

Claims (3)

[Claims] 1. An electrostatic spraying machine for spraying a chemical solution sprayed from a spray nozzle (5) by applying a charge from an electrostatic electrode (19) to the chemical solution and supplying the liquid to the spray nozzle (5). An electrostatic spraying machine, comprising: a pressure switch (16) for detecting that the pressure of a chemical solution has dropped below a set value and interrupting power supply to said electrostatic applying electrode (19). . 2. A main cock (6) provided in a pipe (7, 13, 9, 10) extending from a chemical solution supply pump (4) to the injection nozzle (5) by the pressure switch (16). The electrostatic sprayer according to claim 1, wherein a pressure of the chemical supplied from the chemical supply pump (4) via the main cock (6) is detected on a downstream side. 3. The main cock has a single inlet (6a) connected to a pipe (7) from the chemical liquid supply pump (4), and one outlet (6b) connected to the injection nozzle (5). Pipe (13, 9, 10) and the other outlet (6c) is connected to the chemical liquid tank (2).
The sprayer according to claim 2, characterized in that it is a three-way cock (6) connected to the sprayer.