KR101778076B1 - Pesticide spraying device - Google Patents

Abstract

The present invention relates to a device for spraying pesticide by generating pressure by using a pump. More specifically, disclosed is a technology related to a pesticide spraying device which can recollect pesticide supplied through a spraying unit by using a recollection unit and adjust pressure of spraying the pesticide by controlling the speed of a motor at the same time and can prevent failure of a pump in advance by minimizing pressure applied to the pump when spraying of the pesticide is temporally stopped. In addition, the device for spraying pesticide can adjust spraying intensity by using an adjustment valve of the recollection unit and can reduce the pressure applied to the pump through the recollection unit when spraying of the pesticide is temporally stopped. In addition, when the adjustment valve of the recollection unit is closed, in other words, the pesticide is sprayed at a high intensity, the device for spraying pesticide reduces pressure applied to the pump with a return valve if spraying of the pesticide is temporally stopped. Therefore, the device for spraying pesticide can provide effects of preventing a failure of the pump and preventing corrosion of a spraying unit as the pesticide remaining on the spraying unit can be removed in an easy manner by separating the spraying unit after applying the pesticide.

Description

Pesticide spraying device

The present invention relates to an apparatus for spraying pesticides by generating a pressure using a pump, and more particularly, to an apparatus for spraying pesticides by regulating the speed of a motor while collecting pesticides supplied to a spraying unit using a collecting unit The present invention is directed to a pesticide spraying apparatus capable of controlling the pressure and minimizing the pressure applied to the pump when the pesticide application is temporarily suspended, thereby preventing the pump from failing.

As the farming technology develops, it becomes a large-scale farming with a small manpower, and the development of other farming equipments is reaching a considerable level. Especially, when farming, it is necessary to spray pesticide several times in order to protect crops from pests and diseases. In Korea, it is not easy to spray pesticides on vehicles because terrain conditions are terraced or sloppy. It is troublesome to mobilize a vehicle and it is sprayed by using a portable spreader.

That is, conventionally, in order to improve the production amount of crops, in order to spray the pesticide on the crops as the pesticide is developed, the pesticide is diluted with water in a tank containing the pesticide pesticide or pesticide, The other hand held the sprayer with a nozzle capable of spraying the pesticide supplied from the artificial pump through the supply pipe, and sprayed the agricultural chemicals on the crop to be sprayed.

According to the prior art developed in the above-mentioned technology, a pump for pumping is driven by driving a motor. The suction port side is immersed in a large water tank containing pesticide diluted in water, a long supply pipe is formed on the outlet side, Held the sprayer with the spray nozzle and sprayed the crop with the pesticide supplied at high pressure.

As shown in FIG. 1, a conventional pesticide spraying apparatus having a pump for pumping pesticides by driving a motor includes a storage tank 10 'storing pesticide, a storage tank 10' A pump 30 'connected to the pump 20', a motor 40 'for operating the pump 30', and a spray nozzle 60 'connected to the supply pipe 50'.

At this time, the pump 30 'of the conventional pesticide spraying apparatus is operated by the pressure applied to the pump 30' when the pesticide application is temporarily suspended using the handle switch 51 'installed in the supply pipe 50' And a pressure valve 31 'for stopping the operation of the motor 40' is provided to prevent the pump 30 'from failing.

In addition, the conventional pesticide spraying apparatus adjusts the speed of the motor 40 'by connecting the resistor 41' and the intensity switch 42 'to the motor 40' in order to control the intensity of the pesticide application .

However, in the above conventional pesticide spraying apparatus, the speed of the motor 40 'is adjusted so as to control the intensity of the pesticide spraying, and when the spraying of the pesticide is temporarily suspended, the pressure applied to the pump 30' The motor 40 'and the pressure valve 31' are repeatedly turned on and off as the pressure valve 31 'is repeatedly turned on and off due to the fact that the motor 40' There has been a problem in that it is broken.

In addition, in the conventional pesticide spraying apparatus, when the powdery wettable agent pesticide is used, the pesticide powder is hardened on the pressure valve 31 'for a certain period of time and the pump can not be operated. There is a problem that the pump 40 'is continuously operated by the pressure valve 31' in which the pesticide powder has hardened, and the pump 30 'is broken.

Korea Patent No. 1147384 Korean Patent No. 1294995

SUMMARY OF THE INVENTION [0008] The present invention has been made in order to solve the above problems of the prior art, and the conventional pesticide spraying apparatus has a problem in that, when the speed of the motor for operating the pump is adjusted to a low level, It is possible to adjust the speed of the motor while adjusting the strength of the spraying of the pesticide and to adjust the speed of the motor when the spraying of the pesticide is temporarily stopped, The present invention has as its primary object to provide a pesticide spraying device capable of preventing the pump from being damaged by lowering the pressure by using a return valve.

In order to achieve the above-mentioned object, the present invention provides a storage tank for storing pesticides, a supply unit connected to the storage tank through a transfer pipe, a spray unit connected to a supply unit and a supply pipe, a supply pipe connected to one side, Or a recovery unit connected to the transfer pipe to open and close the pesticide spraying apparatus.

The present invention further includes a return valve connected to one side of a supply pipe and connected to at least one of a storage tank, a transfer pipe, and a collecting unit, and the return valve is configured such that the pressure of the supply pipe is maintained at a predetermined pressure And is opened.

Further, the supply pipe of the present invention is further provided with a connection member which is provided at a distal end thereof, is opened when the spray unit is engaged and closed when the spray unit is separated, and the recovery unit further includes a control valve And adjusts the opening and closing amount and adjusts the supply speed of the supply part 30. [

The pesticide spraying apparatus according to the present invention can control the intensity of spraying using the control valve of the collecting unit and can temporarily lower the pressure applied to the pump through the collecting unit, , When the regulating valve of the recovery part is closed, that is, when the pesticide application is strongly performed, if the pesticide application is temporarily stopped, the pressure applied to the pump by the return valve is lowered, And the spraying portion is separated after the spraying of the pesticide, so that the pesticide remaining in the spraying portion can be easily removed, thereby preventing the spraying portion from being corroded.

1 is a side view schematically showing a conventional agricultural chemical spraying apparatus.
2 is a side view schematically showing an agricultural chemical spraying apparatus according to a preferred embodiment of the present invention.
3 is a side sectional view schematically showing an agricultural chemical spraying apparatus according to a preferred embodiment of the present invention.
FIG. 4 is a side cross-sectional view of the pesticide spraying apparatus according to the preferred embodiment of the present invention, in which the control valve is opened by 50% and the handle switch is opened.
5 is a side cross-sectional view of the pesticide spraying apparatus according to the preferred embodiment of the present invention, in which the control valve is opened by 50% and the handle switch is closed.
6 is a side cross-sectional view of closing the control valve of the pesticide spraying apparatus according to the preferred embodiment of the present invention and closing the handle switch.
7 is a side cross-sectional view of a connecting member according to a preferred embodiment of the present invention.

The present invention relates to an apparatus for spraying pesticides by generating a pressure by a pump 32 driven by a motor 34. More specifically, the present invention relates to an apparatus for spraying pesticide by using a regulating valve 62 of a collecting unit 60 It is possible to control the intensity of the spraying of the pesticide by controlling the pressure applied to the pump 32 driven when the spraying of the pesticide is temporarily stopped by using the return valve 70, It is possible to prevent the breakage of the spraying part 50 in advance and to easily remove the spraying part 50 provided with the spraying nozzle 56 after the spraying of the pesticide to remove the pesticide therein, And a spraying device.

A supply unit 30 connected to the storage tank 10 through a transfer pipe 20; a supply unit 30 connected to the supply tank 30 through a supply pipe 40; A recovery unit 60 connected to the supply pipe 40 at one side and connected to the storage tank 10 or the transfer pipe 20 at the other side to be opened and closed; And a return valve 70 connected to the supply pipe 40 at one side and connected to at least one of the storage tank 10, the transfer pipe 20 and the recovery unit 60 at the other side, .

The return valve 70 of the present invention is opened when the pressure of the supply pipe 40 reaches a predetermined pressure. The supply pipe 40 is installed at the end, And a connection member 42 which is closed when the spray unit 50 is separated from the spray unit 50. The recovery unit 60 includes a control valve 62 for controlling the opening and closing amount, The recovery unit (60) regulates the amount of opening and closing and adjusts the supply speed of the supply unit (30).

Hereinafter, the present invention will be described in detail with reference to FIGS. 2 to 7 showing embodiments of the present invention.

The storage tank 10, which is a main component for achieving the present invention,

The pesticide is stored, and it may be a generally used large-sized reservoir, or it may be of a size that can be carried by a user by using a portable structure.

That is, the storage tank 10 of the present invention is mounted on a moving means such as a portable agricultural pesticide spreader or an agricultural pesticide spreading device, or a moving means such as a vehicle or a tractor, and is connected to a feeder 30 Or may be of a size that can be connected to the spraying unit 50, which will be described later.

The pesticide stored in the storage tank 10 of the present invention may be stored in any conventional pesticide used in general dilution. Even if any liquid such as water is stored, the supply unit 30 and the spray unit 50 Lt; / RTI > can be sprayed.

In addition, the storage tank 10 of the present invention is provided with a mixing member 12 at a lower portion thereof to allow the powder precipitated to the lower portion of the storage tank 10 to be mixed with the liquid when using powdered wettable pesticide, The mixing member 12 is installed on the lower part of the storage tank 10 and installed on the upper part of the transfer pipe 20 to which the pesticide stored in the storage tank 10 is transferred to the supply part 30, (60) and the return valve (70).

That is, the mixing member 12 can be forcibly operated by the user, and when the pesticide is not forcibly operated by the user, when the pesticide is moved to the conveyance pipe 20 and when the pesticide is recovered by the recovery unit 60 To rotate naturally according to the movement of the pesticide, thereby realizing the effect that the wettable pesticide or mixed pesticide can be continuously mixed.

In order to realize the above-mentioned effect, the mixing member 12 may have a propeller shape generally used in the prior art, or may be constructed of any conventional mixer which rotates in accordance with the movement of the fluid, It will be obvious that even if you use it.

The supply unit 30, which is a main component for achieving the present invention,

The pump 32 is connected to the storage tank 10 through a transfer pipe 20 and includes a motor 34 and a pump 32 driven by the motor 34 The other end of the transfer pipe 20 is connected to the storage tank 10.

That is, in the supply unit 30 of the present invention, the pump 32 is operated by the drive of the motor 34, and the pesticide stored in the storage tank 10 due to the operation of the pump 32 is pumped along the transfer pipe 20 (32) and is supplied to the spray portion (50) through the supply pipe (40) to be described later.

In addition, since the pump 32 is not provided with the pressure valve 31 'provided in the conventional pump 30', when the pesticide application is temporarily suspended during the pesticide application, the pump 32 The pump 32 may be damaged by the applied pressure (hereinafter referred to as "overload"). However, the pump 32 may be damaged by the pressure applied to the pump 32 by using the return portion 60 and the return valve 70, By reducing the pressure, the pump 32 is prevented from being damaged.

At this time, it is obvious that the motor 34 can be operated and stopped by a user using an operation switch (not shown) as in the prior art, and the control valve 62, which will be described later, 64), the speed of the motor (34) can be controlled to control the intensity of the pesticide application.

The speed of the motor 34 is increased when the first return pipe 64 is closed by the control valve 62 and is decreased when the first return pipe 64 is opened by opening the second interlocking gear 62 of the return unit 60, And a first interlocking gear 36 meshing with the first interlocking gear 68. That is, the motor 34 realizes the effect of reducing the overload of the pump 32 by reducing the speed of the motor 34 while the first return pipe 64 is opened by the control valve 62 .

The spraying unit 50, which is a main component for achieving the present invention,

The pesticide generated from the pump 32 of the supply unit 30 is supplied to the application unit 50 through the supply pipe 40 and is supplied to the application unit 50 through the supply unit 30 and the supply pipe 40, And can be sprayed.

2, the spray portion 50 of the present invention is connected to the end of the supply pipe 40 and includes a discharge pipe 52 having a handle switch 54 and a discharge pipe 52 having a handle switch 54, The spray gun 54 is provided with one or more spray nozzles 56 extending from the distal end thereof for spraying the pesticide. The spray gun 54 opens and closes the spray pipe 52 to spray the pesticide supplied through the supply pipe 40 And is injected through a nozzle (56).

The injection pipe 52 is connected to the first end of the supply pipe 40 at one end and the other end of the handle switch 54 is connected to the end of the supply pipe 40 at the other end. And a second spray tube 52b having one end connected to one end of the first spraying nozzle 54 and one or more spray nozzles 56 provided at one end thereof.

In addition, the spraying unit 50 of the present invention may have the first spraying tube 52a, the handle switch 54, the second spraying tube 52b, and the spraying nozzle 56 integrally formed, It may be combined.

The injection nozzle 56 is installed at one end of the second spray tube 52b and the second spray tube 52b is bent at one end thereof in one direction as shown in FIG. It realizes the effect that the pesticide can be injected easily in a desired direction.

In addition, the handle switch 54 of the present invention has the same configuration as that of the normally used open / close valve, and a detailed description thereof will be omitted. The handle body (not shown) is formed so that the user can easily grasp the handle. (Not shown) protruding from the left and right sides of the discharge tube 52, so that the discharge tube 52 can be easily opened and closed by the operation of depressing the switch.

That is, the spraying unit 50 of the present invention can temporarily suspend spraying and spraying of the pesticide easily by using the handle switch 54 to spray a desired amount of pesticide at a desired place by the user.

The recovery unit 60, which is a main component for achieving the present invention,

And the storage tank 10 or the transfer tube 20 is connected to the other side and opened and closed so that the spraying of the pesticide is temporarily stopped using the handle switch 54 of the spraying unit 50 The overload applied to the pump 32 by the pressure generated by the operation of the pump 32 can be reduced.

That is, when the pump 30 'of the conventional pesticide spraying apparatus temporarily stops spraying the pesticide, the pressure valve 31' is operated by the overload applied to the pump 30 'to operate the pump 30' By stopping the driving of the motor 40 'for stopping the driving of the motor 40', it is possible to reduce the overload applied to the pump 30 'repeatedly by a short but generated overload in the pump 30' The pump 30 'may be overloaded, and unnecessary energy is wasted for driving the motor 40' again.

In addition, although the conventional pesticide spraying device adjusts the driving speed of the motor 40 'in order to control the intensity of the pesticide spraying, as mentioned in the background of the invention, the overload applied to the pump 30' The static pressure for actuating the pressure valve 31 'is not generated so that the pump 30' is continuously overloaded, thereby causing damage to the pump 30 'and the motor 40'.

However, in the pesticide spraying apparatus of the present invention, when pesticide application is temporarily stopped, the pesticide is partially recovered by the recovery unit 60 to reduce the overload of the pump 32, thereby circulating the pesticide, So that the pump 32 can be prevented from being damaged in advance by reducing overload.

Specifically, the recovery unit 60 of the present invention further includes a control valve 62 capable of controlling the amount of opening and closing, thereby adjusting the amount of the pesticide recovered to regulate the intensity of the pesticide spraying, The overload applied to the pump 32 can be reduced.

In addition, the recovery unit 60 of the present invention includes a control valve 62 capable of controlling the amount of opening and closing, a first recovery pipe 64 to which one end is connected to the supply pipe 40, And a second recovery pipe 66 to which the other end of the pipe 64 is connected and the storage tank 10 or the transfer pipe 20 is connected to the other end.

The recovery unit 60 of the present invention includes a second interlocking gear 68 connected to the control valve 62 and rotated and the second interlocking gear 68 is connected to the motor And the first interlocking gear (36) of the second motor (34) are rotated together to adjust the rotation speed of the motor (34).

That is, in the recovery unit 60 of the present invention, the pesticide supplied to the supply pipe 40 by the pump 32 is partly recovered by the control valve 62 so that the pressure of the pesticide supplied to the spray unit 50 When the pesticide application is temporarily stopped using the handle switch 54, the pesticide is recovered and circulated by the control valve 62, thereby reducing the overload applied to the pump 32 The pump 32 can be prevented from being damaged.

In addition, the recovery unit 60 of the present invention not only opens and closes the first recovery pipe 64 by rotating the control valve 62, but also uses the second interlocking gear 68 to rotate the first interlocking gear 36 To transmit the operation information to a switch (not shown) connected to the first interlocking gear 36 to adjust the speed of the motor 34.

That is, as an example of controlling the intensity of the pesticide by using the control valve 62, when the control valve 62 is rotated in the direction of closing the first return pipe 64 to spray the pesticide heavily, And transmits the operation information for increasing the speed of the motor 34 to the switch by rotating the first interlocking gear 36 through the first interlocking gear 68 to one side. The operation for weakly spraying the pesticide is carried out in the opposite direction by rotating the control valve 62 in the opposite direction.

At this time, the opening / closing part 64a of the first return pipe 64 connected to the control valve 62 may be in the form of a ball valve or the like installed in a transfer pipe for transferring the fluid, It is obvious that it is possible to have any conventional valve type that can be opened and closed at the same time as the regulating valve, and the amount of opening and closing of the first return pipe 64 is adjusted by the rotation of the regulating valve 62.

In connection with the above, the pesticide recovered in the recovery unit 60 of the present invention may be transferred to the storage tank 10 and then transferred to the transfer pipe 20, or may be circulated directly to the transfer pipe 20 But it is preferable to be connected to the conveying pipe 20 for the operation of the mixing member 12 described above.

That is, the second recovery pipe 66 of the recovery unit 60 of the present invention is connected to the transfer pipe 20 at the other end thereof, and is recovered through the first recovery pipe 64 and the second recovery pipe 66, So that the mixing member 12 can be rotated.

The return valve 70, which is a main component for achieving the present invention,

The supply pipe 40 is connected to one side and the other side is connected to at least one of the storage tank 10, the transfer pipe 20 and the recovery unit 60 to be opened and closed. Is opened when the pressure of the refrigerant reaches a predetermined pressure.

At this time, the predetermined pressure is a pressure at which the return valve 70 is operated, and varies depending on the pressure set by the user on the return valve 70. For example, the pressure generated by the pump used in the pesticide sprayer it is most preferable to operate when a pressure of 7 to 8 bar or 8 bar is generated in the supply pipe 40 based on the bar.

Of course, it will be appreciated that the operation of the return valve 70 of the present invention is not activated when the dispensing portion 50 is opened by the handle switch 54, and the dispensing portion 50 is closed by the handle switch 54 And is operated when the pressure of the supply pipe (40) rises when the recovery unit (60) is closed.

3, the return valve 70 of the present invention has a transfer hole (not illustrated) at a portion connected to the supply pipe 40, and a ball 74 and a ball And a compression spring 72 for urging the piston 74 in the direction of the transfer hole so that the return valve 70 is closed by the ball 74 and the compression spring 72 when the spraying portion 50 or the collecting portion 60 is opened When the spraying unit 50 and the collecting unit 60 are closed, the balls 74 are separated from the transfer holes by the pressure, and the pesticide is collected in the storage tank 10 or the second collecting pipe 66, The operating pressure of the return valve 70 can be adjusted according to the compressive force of the compression spring 72.

3, the return valve 70 of the present invention may include a supply pipe 40 connected to one side and a connection pipe 20 and a second return pipe 66 connected to the other side of the return valve 70, In another embodiment, the supply pipe 40 is connected to one side and the transfer pipe 20 is connected to the other side. At this time, the second recovery pipe 66 may be connected to the transfer pipe 20. That is, the return valve 70 and the recovery unit 60 are preferably configured such that the pesticide passes through the transfer pipe 20 or is directly recovered to the storage tank 10.

The operation of the present invention will now be described with reference to FIGS.

≪ Embodiment 1 >

1. condition: handle switch (54) - opening, regulating valve (62) - steel (first return line (64) closing - motor (34) speed maximum), return valve 34 is operated at the maximum speed and the pressure of the pesticide supplied by the pump 32 is 8 bar,

2. Result: The pesticide is sprayed on average 8 bar through the spraying unit 50, and the pressure of the supply pipe 40 is less than 8 bar so that the pressure applied to the pump 32 is very low.

≪ Embodiment 2 >

1. Condition: Handle switch (54) - closing, control valve (62) - steel (first return line (64) closing, motor (34) speed max.), Return valve 34 is operated at the maximum speed and the pressure of the pesticide supplied by the pump 32 is 8 bar,

2. Result: The pressure of the supply pipe 40 is raised to 8 bar, the pesticide is recovered to the transfer pipe 20 through the return valve 70 and flows into the storage tank 10, and the mixing member 12 is operated Thereby mixing the pesticide in the storage tank (10). Also, the pressure applied to the pump 32 is about 5 bar or less.

≪ Embodiment 3 >

(50)% of the first return pipe (64), 50% of the speed of the motor (34)), return valve (70) operating pressure-8 bar , When the motor 34 is operated at a speed of 50% and the pressure of the pesticide supplied by the pump 32 is 4 bar,

2. Result: The pesticide is sprayed at an average of 4 bar through the spraying unit 50, and the pressure of the supply pipe 40 is less than 4 bar so that the pressure applied to the pump 32 is very low.

That is, the present invention can control the intensity of the pesticide spraying by adjusting the amount of opening / closing of the collecting part 60 freely (for example, adjusting the opening / closing amount of 0 to 100) 34 can be used to reduce the consumption of the battery, thereby increasing the use time of the pesticide spraying apparatus. When the spraying unit 50 is closed and the pesticide application is temporarily stopped, the overload applied to the pump 32 It is possible to prevent the damage of the motor 34 that operates the pump 32 and the pump 32 in advance by operating the return valve 70 and to operate the mixing member 12 of the storage tank 10 It is possible to obtain an effect of preventing precipitation of pesticide residues.

The pesticide spraying apparatus of the present invention further includes a connection member 42 which is provided at the distal end of the supply pipe 40 and is opened when the spraying unit 50 is engaged and closed when the spraying unit 50 is detached, When the user stops the driving of the motor 34 in order to stop the spraying of the pesticide by spraying the spraying part 50 at the spraying part 50 for spraying the pesticide with the supply pipe 40 and the user stops the spraying part 40, It is possible to easily wash and dry the pesticide remaining in the inside of the spray unit 40, thereby preventing the spray unit 40 from being frozen and corroded in winter.

7, the connecting member 42 includes a body 42a and a rotating plate 42b installed inside the body 42a so as to be rotatable, and a connecting member 42b disposed on the inner surface of the body 42a An operation protrusion 42d which is movable in the longitudinal direction of the body 42a and is protruded in one direction by a spring 42c and whose other end is connected to the rotation axis 42e of the rotation plate 42b to rotate the rotation axis 42e, When the other end of the first spray tube 52a of the spray unit 50 presses the operation projection 42d, the rotation plate 42b is rotated to open the supply tube 40, The rotation plate 42b closes the supply pipe 40 unless the other end of the first injection pipe 52a is separated and presses the operation protrusion 42d. At this time, it is obvious that a configuration in which the airtightness of the supply pipe 40 is maintained by the rotary plate 42b is added, and any technology can be used in the past, so a detailed description will be omitted.

That is, when the user separates the spray unit 50 after spraying the agricultural chemicals, the connection member 42 does not flow out the pesticide remaining in the supply pipe 40 and can safely wash and dry the spray unit 50 And by closing the supply pipe 40, it is possible to realize the effect that the pesticide application can be further facilitated later.

A heat dissipation film (not shown) may be attached to the outside of the spray switch 54 of the spray unit 50 of the present invention on the outer side of the spray pipe 52 to which the knob switch 54 is coupled, It is possible to prevent the handle switch 54 from being frozen by the pesticide and water remaining in the handle switch 54 after spraying the pesticide.

At this time, the heat radiating film may be operated by installing and operating a portable power supply means capable of supplying power such as dry batteries to the handle switch 54, or by receiving power from the power supplied to the motor 34.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It is possible to carry out various changes in the present invention.

10: Storage tank 20: Transfer pipe
30: supply part 32: pump
34: motor 40: supply pipe
50: Sprayer 52: Sprayer
54: handle switch 56: injection nozzle
60: recovery section 62: regulating valve
64: First water pipe 66: Second water pipe
70: return valve 72: compression spring
74: The ball

Claims (7)

A storage tank 10 in which pesticides are stored;
A supply unit 30 connected to the storage tank 10 and the transfer pipe 20;
A spray unit 50 connected to the supply unit 30 and the supply pipe 40; And
And a recovery unit 60 connected to the supply pipe 40 at one side and connected to the storage tank 10 or the transfer pipe 20 at the other side,
The recovery unit (60)
And a control valve (62) for controlling the opening and closing amount,
And adjusts the supply rate of the supply part (30).
The method according to claim 1,
The pesticide application device
And a return valve 70 connected to the supply pipe 40 at one side and connected to at least one of the storage tank 10, the transfer pipe 20 and the recovery unit 60 at the other side, Wherein the pesticide spraying device is a pesticide spraying device.
3. The method of claim 2,
The return valve (70)
And is opened when the pressure of the supply pipe (40) reaches a certain pressure.
The method according to claim 1,
The supply pipe (40)
Further comprising a connection member (42) installed at a distal end of the spar part (50) when the spar part (50) is engaged and closed when the spar part (50) is detached.
delete delete The method according to claim 1,
The recovery unit (60)
And a second interlocking gear (68) rotated by the operation of the control valve (62)
And a first interlocking gear (36) which is rotated by engaging with the second interlocking gear (68) to adjust the speed of the motor (34).

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