JPH09299781A - Liquid agent infecting/mixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify work and to save labor in a device where a liquid agent in a vessel is mixed and diluted before the liquid agent is sprayed on a field by providing a liquid agent suction/forcibly feeding part in which pistons plural cylinders are moved to continuously perform the liquid agent suction and injection/mixing action. SOLUTION: When pistons 5, 8 are moved in the right direction in a first stroke, fresh water is sucked into a left inner side 4 of a cylinder C1 and a liquid agent is discharged from a right inner side 6 thereof. At the same time, the liquid agent is sucked into a left inner side 7 of a cylinder C2 and the fresh water is discharged from a right inner side 9 thereof. Next, when the piston 5, 8 are meowed in the left direction in a second stroke, the fresh water is discharged from the left inner side 4 and the liquid agent is sucked into the right inner side 6. At the same time, the liquid agent is injected into an injecting/mixing device Mx from the left inner side 7 and the fresh water is sucked into the right inner side 9. And when each stroke is finished, the moving directions of 3-port valves V1-V4 and the pistons 5, 8 are switched and both strokes are alternately repeated, allowing the liquid agent to be injected and mixed and to be sprayed from a nozzle N.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid agent injection / mixing device for injecting a liquid agent filled in a liquid agent container into a fresh water pipe pressurized by a spraying pump to mix and dilute it to a predetermined concentration. Is.

[0002]

2. Description of the Related Art At the present time, a spraying device for a liquid agent spraying machine that is generally popular is to fill a tank with a chemical solution which has been diluted with fresh water to a predetermined concentration (generally, a dilution ratio of about 500 to 2000 times). The liquid medicine inhaled from there is pressurized by a spraying pump and is sent under pressure to a nozzle for spraying. In such a device, the dilution ratio of the liquid agent and the spray amount (for example, the spray amount per 10a) are determined according to the purpose of spraying, and the drug solution is calculated from the field area based on them, and then the drug solution is prepared. Is necessary, but it is a considerably complicated work when it is applied to a plurality of fields of different sizes.

In addition, as the influence of pesticides on the environment has become a problem, sufficient consideration is required for the treatment of the residual liquid after the spraying work.

[0004] In order to perform efficient work in a large paddy field using a working machine that sprays liquid chemicals etc. while traveling in the paddy field, it is necessary to reduce the frequency of replenishment of the chemical solution in the paddy field as much as possible. Will be needed. For this reason, in the case of using the above-mentioned widely used spraying device in the sprayer of the same system, it is necessary to mount a chemical liquid tank having a larger capacity. However, since the soil in paddy fields is extremely soft compared to fields, etc., there is a limit to the increase in the tank capacity to be installed due to the impact on mobility, which is a problem in improving work efficiency. .

Some liquid agent injection / mixing devices have already been commercialized in Europe and the United States. However, the spraying device which is generally popular in Japan as described above has a pressure of 1 MPa (10
It is used when spraying 100 l or more per 10a under a high pressure of kgf / cm ² ) or more (so-called large amount spraying).
There is no liquid agent injection / mixing device that can be attached to such a spraying device and used. This is because a spraying device in Europe and the United States uses a high-concentration (several to several tens of times diluted) liquid agent.
This is because it is generally used when spraying at a low pressure of about 1 to 0.3 MPa and 50 l or less per 10 a (so-called small amount spraying).

In Japan, there have been research and development examples in the past of a liquid agent injection / mixing device using a pump using a DC motor drive in the injection part and a system using a cylinder (double-acting single cylinder). There is nothing that has been put into practical use.

On the other hand, in order to perform liquid agent spraying work and the like in a paddy field with high efficiency, a paddy work vehicle equipped with a device for pumping paddy water during the work and using it for dilution of the liquid agent is disclosed in Japanese Patent Laid-Open No. 6-78657. And Japanese Patent Application Laid-Open No. 6-153643, the liquid agent injection / mixing device to be mounted on the liquid agent spraying device of these work vehicles was required. However, although there are some liquid agent injection / mixing devices that are commercially available in Europe and the United States as described above, in Japan, although there have been studies in the past, they have not been put to practical use. Moreover, since the European and American devices are for low-pressure small-quantity spraying, they cannot be adopted in the spraying devices for high-pressure large-volume spraying generally used in Japan in terms of pressure resistance and driving power.

[0008]

In the method using the above DC motor-driven pump for liquid injection, since the liquid injection amount is adjusted by controlling the rotation of the DC motor, the setting of the dilution ratio of the liquid is comparative. Although it was possible to perform highly precise and wide-range injection, the liquid agent was injected into the spill pipe of the spray pump (the pressure in the pipe is lower than the spray pressure). There is a problem that the power and pressure resistance of the injection pump are not sufficient to use for injection / mixing into the pipeline sprayed at the above pressure, and further, residual liquid treatment is required.

In the system using the cylinder, a mechanism for injecting the liquid agent by utilizing the pressure of the fresh water pipe pressurized by the atomizing pump is used, so that the liquid drug can be injected into the high-pressure pipe. Since there is only one cylinder, it is necessary to alternately (intermittently) inject and inhale the liquid agent, which causes a problem that the spraying work is interrupted when the liquid agent is inhaled. Further, since the injection amount is adjusted by a manual flow rate adjusting valve, it is difficult to set the dilution ratio of the liquid agent with high accuracy.

Up to now, no liquid agent injection / mixing device applicable to the spraying device of the work vehicle has been found. In addition, the liquid injection / mixing device that has been studied in Japan in the past has insufficient injection accuracy due to insufficient compatibility with various liquids with different physical properties, and intermittent injection and inhalation of liquids. There was a problem that the spraying work was interrupted due to the mechanism for performing.

[0011] A small amount of ground liquid agent sprayer for paddy fields, which has been recently developed and put into practical use, mainly uses a 300-fold dilution liquid.
It is a method of spraying 25 l per 0a. This liquid small amount spraying machine uses a spraying device in which the nozzle spray amount increases and decreases in proportion to the working speed so that the spraying amount is always constant (that is, 25 l per 10a) even at different working speeds. Therefore, the liquid agent injection / mixing device mounted on the spraying device must have a function of always keeping the dilution multiple constant even when the nozzle spray amount changes with the working speed.

The present invention has been made based on the above circumstances. In contrast to the conventional liquid agent sprayer, which requires a dispensing operation for each replenishment of the chemical liquid, the liquid agent injection / mixing device of the present invention is used. The sprayer used does not require any other work by only filling or replenishing separate containers with fresh water and liquid agent, and reduces the chance of direct contact with the drug, thus simplifying work and saving labor. It is possible to improve the efficiency and safety, and unlike the conventional method, since the dispensed chemical liquid hardly remains after the spraying work, the problem of residual liquid treatment can be solved, and further, the liquid chemical in the liquid chemical container can be specified. Since it can be used separately by collecting in the container, it can be expected to reduce the amount of liquid agent used. In addition, it is possible to use the undiluted solution container itself as the liquid agent container, which saves labor such as cleaning of the undiluted solution tank after the work, and also reduces the chance of direct contact with the drug, thus improving the safety. The purpose is to provide.

[0013]

In order to achieve the above object, the present invention provides: Mixing and diluting liquid agents such as fungicides, insecticides, herbicides, etc., filled in a container for liquid agents into a predetermined concentration by injecting them into a fresh water pipe pressurized by a spraying homp. In a device for spraying the liquid agent onto a crop or a field, by moving the pistons in a plurality of cylinders in the device, the liquid agent is sucked from the liquid agent container on the suction stroke side, and at the same time. The liquid agent is injected and mixed into the fresh water pipe pressurized by the atomizing pump on the discharge stroke side, and at the end of both strokes, the moving direction of the piston and the pipe line system are simultaneously switched to suck and suck the liquid medicine. It is characterized in that it is provided with a liquid medicine suction / pressure feeding section for continuously performing the injection / mixing operation until the liquid medicine in the liquid medicine container runs out.

.. The liquid agent suction / pumping section equalizes the pressure on the injection side to the fresh water pipeline by pressurizing the suction side of the cylinder using the pressure of the fresh water pipeline, and the injection / mixing to the high-pressure fresh water pipeline is performed with low power. The feature is that it was done in.

[0015] The liquid agent suction / pressure feeding unit is characterized in that the concentration of the liquid agent when mixed with fresh water can be adjusted by controlling the moving speed of the piston.

[0016]

The liquid agent injecting / mixing device of the present invention having the above-described structure comprises: a. This device can be used as a device for injecting and mixing liquid agents in a liquid agent sprayer mounted on a paddy work vehicle that is used to dilute the surface water of a paddy field during work (traveling) while it is used for diluting the liquid agent, etc. . This liquid agent sprayer does not require replenishment of water for dilution and dispensing work, and the area where continuous spraying can be performed is expanded as compared with the conventional method, so that the work efficiency can be improved. Further, since it is not necessary to equip a large-capacity tank, it is possible to reduce the size of the entire machine body, and as a result, it is possible to secure stable traveling performance in the paddy field.

B. This device uses the pressure in the fresh water pipe pressurized by the spray pump to pressurize the inside of the cylinder of the liquid agent suction / pumping unit to make the pressure of the fresh water pipe and the liquid injection line almost equal. Therefore, it is possible to inject the liquid agent into a high-pressure pipe line such as a widely used spraying device by applying a relatively small driving force to the piston.

C. The single cylinder type liquid agent injection device that was developed in the past was also a method of injecting and mixing the liquid agent using the pressure in the fresh water pipe pressurized by the spray pump.
Since the method of alternately injecting and inhaling the liquid agent is used, the spraying work is interrupted during the inhaling operation. On the other hand, in the device of the present invention, the even number of cylinders are operated simultaneously, so Injection and inhalation at the same time,
In addition, since it is continuously performed, it is possible to continuously perform the spraying work without interruption.

D. This device is a system in which the injection rate of the liquid agent is controlled by controlling the moving speed of the piston of the liquid agent suction / pressure feeding section, and the dilution rate of the liquid agent is adjusted based on this. Here, as a power source of the linear motion mechanism that drives the piston of the liquid agent suction / pressure feeding unit, for example, a device such as a DC motor whose rotation speed is relatively easy to control is used to adjust the dilution ratio of the liquid agent. Can be performed easily and with high accuracy.

[0020]

Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

FIG. 1 is a stroke diagram showing the operation of the liquid agent injection / mixing device and the first stroke of the pipeline system, and FIG. 2 is a stroke diagram showing the operation of the liquid agent injection / mixing device and the second stroke of the pipeline system. FIG. 3 is a process diagram showing a first process of the liquid medicine injection / mixing device in the case of performing mixed spraying.

1 and 2, the spraying device using the liquid agent injecting / mixing device according to the present invention is one in which fresh water for dilution sucked from the water inlet S in the fresh water tank T1 is pressurized by the spraying pump P. , Through the branch path 1 to the injection / mixer Mx under pressure, where it is mixed (diluted) with the liquid agent sucked from the liquid agent container T2 and pressurized / pressurized by the liquid agent suction / pressure feeding unit I. ), And is sent by pressure to the nozzle N and sprayed.

At this time, by connecting the fresh water pipeline and the liquid agent suction / pressure feeding section I through the branch channel 1, the liquid agent suction / pressure feeding section I is pressurized and the pressure of the injection pipeline becomes equal to that of the fresh water pipeline. By doing so, the liquid agent can be injected and mixed into the fresh water pipe having a relatively high pressure by only the driving force of the small piston.

1) Constituent Elements and Basic Operation The liquid agent suction / pressure feeding section I has a plurality of (even number) cylinders arranged in parallel or in series as main constituent elements. FIG.
In addition, FIG. 2 shows an example in which two rod double-acting cylinders (having the same dimensions) of the simplest configuration are arranged in parallel.

Here, the reason why the double rod type cylinder is used is to make the pressure receiving areas and the sliding resistances on both sides of the piston in the cylinder equal. The reason why cylinders of the same size are used is that the flow rates at the time of suction and discharge of both cylinders can be controlled only by the moving speed of the piston. Both figures are alternately repeated in this device 2
It represents one journey. Here, FIG. 1 shows the first stroke, and FIG. 2 shows the second stroke.

Pistons 5 and 8 in each cylinder
Are connected by a connecting rod 10 via a piston rod. Therefore, by moving the connecting rod 10 to the right or left in the figure by the linear motion mechanism 11, the piston 5
Since and 8 move simultaneously with the connecting rod 10 in the same direction,
Discharge (or pressure feed) is performed on the side where the inside is compressed by both pistons, and suction is performed on the side that expands.

In the present apparatus, the concentration of the liquid agent when mixed with the fresh water (dilution factor of the liquid agent) is determined by the flow rate of the fresh water in the injection / mixer Mx and the injection amount of the liquid agent. Here, under the condition that those flow rates are set to predetermined values, the first
When the process (FIG. 1) and the second process (FIG. 2) are alternately repeated, inhalation, injection and mixing of the liquid agent are continuously performed, and the chemical solution having a predetermined concentration is continuously sprayed from the nozzle N. The pipeline system and operation of the first and second strokes will be described below.

2) Pipe line system and operation stroke (1) First stroke The first stroke is a case where the connecting rod 10 moves to the right in FIG. At this time, since the connected pistons 5 and 8 move in the same right direction as the connecting rod 10, the left inside 4 of the cylinder C1 expands and the right inside 6 is compressed. As a result, in the left inner side 4, the fresh water pressurized by the spraying pump P is taken in via the branch passages 1, 2 and the 3-port valve V1, and from the right inner side 6, the previous stroke (second stroke or start). Operation of time)
At, the liquid agent that has been inhaled is discharged, and this is pumped to the injection / mixer Mx via the 3-port valve V2 and the branch passage 3, and is injected / mixed into the pressurized fresh water pipeline. At the same time, the left inner side 7 of the cylinder C2 expands and the right inner side 9 compresses. Therefore, in the left inner side 7, the liquid agent is sucked from the liquid agent container T2 via the branch passage 12 and the 3-port valve V3, From the right inner side 9, the fresh water sucked in the previous stroke (second stroke) is discharged to the fresh water tank T1 through the branch passage 13.

(2) Second stroke The second stroke is a case where the connecting rod 10 moves to the left in FIG. 2 (the opposite direction to that in FIG. 1). At this time, the pipeline is switched as shown in FIG. 2 by the 3-port valves V1, V2, V3 and V4.

In this case, since the pistons 5 and 8 connected by the connecting rod 10 move to the left in the figure, the left inside 4 of the cylinder C1 is compressed and the right inside 6 is expanded. As a result, the fresh water sucked from the left inner side 4 in the previous stroke (first stroke) is discharged to the fresh water tank T1 via the branch passage 13, and on the right inner side 6 via the branch passage 12 and the 3-port valve V2. The liquid agent is inhaled from the liquid agent container T2. At the same time, the left inner side 7 of the cylinder C2 is compressed and the right inner side 9 expands, so that the liquid agent sucked in the previous stroke (first stroke) is discharged from the left inner side 7, and this is the 3-port valve V3. And through the branch passage 3 and is injected and mixed into the fresh water pipe by the injection / mixer Mx. At this time, branch roads 1 and 2 to the right inside
And suction of fresh water pressurized by the spraying pump P via the 3-port valve V4

3) Regarding the switching of the conduits of the chemical liquid suction / pumping section In this apparatus, in order to continuously perform the injection / mixing operation,
Simultaneously with the switching of the moving direction of the connecting rod 10, the pipeline switching by the 3-port valves V1, V2, V3 and V4 connected to each cylinder is performed. For this purpose, for example, as shown in FIGS. 1 and 2, using a 3-port solenoid valve, all the valves are operated simultaneously by switching the moving direction of the connecting rod 10 and simultaneously operating all the valves by an electric signal generated. Or a method of switching all valves at the same time using a link that operates when the connecting rod 10 reaches the end point of movement on one side using a mechanical 3-port valve, etc. Can be considered.

4) About the direct acting mechanism of the liquid agent suction / pressure feeding section and the control of the liquid agent injection amount The linear moving mechanism 11 of the liquid agent suction / pressure feeding section I is, for example, as shown in FIG.
As shown in FIG. 2, a mechanism in which the connecting rod 10 linearly moves on a rotating shaft driven by a DC motor or the like, or a mechanism in which the connecting rod 10 is linearly driven by an electric or hydraulic cylinder is used. Can be used.

At this time, when a DC motor is used as the power source of the linear motion mechanism 11, the moving direction of the connecting rod 10 (that is, the moving direction of the piston) is switched by rotating the DC motor in the forward or reverse direction. Further, the moving speed of the connecting rod 10 (that is, the moving speed of the pistons 5 and 8) can be controlled by controlling the motor rotation speed. Therefore, for example, the switching positions of the 3-port I valves V1 to V4,
By incorporating a system that controls the motor rotation speed, the rotation direction, and the switching of the 3-port valve based on the positions of the pistons 5 and 8 and the output of the flow rate sensor, etc., highly accurate concentration adjustment becomes possible.

5) Adjustment and Setting of Liquid Agent Concentration (Dilution Multiple) Since the pressure receiving areas of the pistons 5 and 8 are equal, the liquid agent injection amount is set by adjusting the moving speed of both pistons. Therefore, the concentration of the liquid agent when mixed with fresh water (dilution factor of the liquid agent) is determined by the fresh water flow rate and the liquid agent injection amount in the injection / mixer Mx. So, for example,
As shown in FIG. 1 and FIG. 2, the flow sensor F provided in the pipeline measures the flow rate of the pipeline in real time, and a system for controlling the moving speed of the piston based on this is used to measure the concentration of the liquid agent. Can be set with high accuracy.

A recently-developed small amount sprayer for spraying liquid on the ground in paddy field (mainly 300 times diluting solution is 2 per 10a)
For 5 l spraying), a spraying device of a system (working speed interlocking system) that obtains a spray amount in proportion to the working speed is used, and the spraying amount per unit area is always constant (that is, at different working speeds). 25 l) per 10 a).
Therefore, in the liquid agent injection / mixing device of the present invention, for example, as shown in FIGS. 1 and 2, the working speed of the spraying machine is measured by a vehicle speed sensor or a rotation speed sensor of the axle (or the ground PTO shaft) (FIGS. 1 and 2). Of the working speed interlocking system by adding a system for detecting the moving speed of the piston of the liquid drug suction / pressure feeding unit I (that is, the liquid drug injection amount) based on the detection of the working speed detection unit R). It can correspond to a spraying device.

With respect to the work speed interlocking type spraying device in which the spray pump is driven by the ground PTO shaft, the discharge amount (pipe flow rate) is detected by detecting the spray pump rotation speed using a rotation speed sensor or the like. ) And the working speed can be calculated at the same time, a method of controlling the liquid agent injection amount using this can also be used.

6) Pressurization from the fresh water pipe to the liquid suction / pumping portion In the first stroke (FIG. 1), the left inner side 4 of the cylinder C1 passes through the branch passages 1, 2 and 3 port valve V1. Spraying pump P
The right inner side 6 of the same cylinder is connected to the liquid agent injection / mixer Mx via the 3-port valve V2 and the branch 3. Therefore, cylinder C
The pressure inside 1 is approximately equal on both sides of the piston. Also in the second stroke (FIG. 2), the left inner side 7 of the cylinder C2 is
Is connected to the liquid agent injection / mixer Mx via the 3-port valve V3 and the branch 3, and the right inner side 9 of the cylinder is a fresh water pipeline pressurized via the branch passages 1 and 2 and the 3-port valve V4. The pressure is almost equal on both sides of the piston because it is connected to.

With this mechanism, in this device, the pressure is always equal on both sides of the piston of the cylinder for injection, so even if the fresh water pipe line is under high pressure, the injection of the liquid agent can be performed by applying a relatively small driving force to the piston. Is possible. In addition, the fact that the driving force of the piston is small brings about effects such as simplification of the control system, improvement of setting accuracy and expansion of the setting range in controlling the piston moving speed for adjusting the liquid injection amount. Is.

7) Dispersion of two kinds of liquid medicines When it is necessary to mix and spray two kinds of liquid medicines, for example, as shown in FIG. 3, it is composed of two liquid medicine containers and four cylinders. It is conceivable to use such a liquid agent suction / pressure feeding unit I to connect the liquid agent injection pipes from these to the fresh water pipes in the injection mixer Mx.

8) Number and Shape of Cylinders Constituting Liquid Agent Suction / Pump Feed Portion In the liquid agent injection / mixing device of the present invention, the liquid medication intake / pressure feed portion I is composed of two or more cylinders whose pistons are connected by connecting rods. It is possible to configure. 1 and 2 show an example in which two cylinders are used, and FIG. 3 shows an example in which four cylinders are used.

As described above, in this device, "liquid injection / pressurization of fresh water" and "liquid intake / discharge of fresh water" are simultaneously and alternately performed by the reciprocating motions of the pistons in the respective cylinders. Also, it is desirable that the mechanical balance of the entire apparatus be easily maintained and that the operation and flow rate control be simple. Therefore, even cylinders of the same shape and size are used as the cylinders constituting the present apparatus.

9) Liquid agent container As a container for filling the liquid agent, a method of using a container dedicated to this apparatus, a method of mounting a commercially available liquid agent together with the container, or the like can be considered.

Next, the liquid agent injection / constitution as described above is performed.
The operation of the mixing device will be described.

In the first stroke (FIG. 1), the pistons 5 and 8 are
Is moved to the right in the figure, and fresh water is sucked into the left inner side 4 of the cylinder C1, and the liquid agent sucked from the right inner side 6 in the previous stroke (second stroke) is discharged, that is, injected into the fresh water pipeline. . At the same time, the liquid agent is sucked into the left inner side 7 of the cylinder C2, and the fresh water sucked from the right inner side 9 in the previous stroke (second stroke) is discharged.

In the second stroke (FIG. 2), the pistons 5 and 8 are
Is moved to the left in the figure, clear water is discharged from the inner left side 4 of the cylinder C1, and liquid is sucked into the inner right side 6. At the same time, the liquid agent is injected from the left inside 7 of the cylinder C2 into the injection / mixer Mx, and fresh water is sucked into the right inside 9. At the end of each stroke, four 3-port valves (V1, V2,
(V3, V4) and the moving direction of the piston are switched at the same time, and the two strokes are alternately repeated to continuously inject and mix the liquid agent in the liquid agent container T2 until the liquid agent is exhausted without interrupting the spraying.

In the first stroke, the left inner side 4 of the cylinder C1 is connected to the fresh water pipeline in the branch passage 1, and the right inner side 6 is connected to the fresh water pipeline in the injection / mixer Mx. Is almost equal on the left and right sides of the piston 5. Similarly, in the second stroke, the left inner side 7 of the cylinder C2 is connected to the fresh water pipeline by the injection / mixer Mx, and the right inner side 9 is connected to the fresh water pipeline at the branch path 1. The pressure on both sides is almost equal. Therefore, even if the fresh water pipe is under high pressure, the liquid agent can be injected by only applying a relatively small driving force to the piston.

The liquid injection amount can be set by adjusting the moving speed of the pistons 5 and 8. Therefore, by using a system that automatically controls the moving speed of both pistons by detecting the flow rate on the discharge side and the work (travel) speed,
Always inject at a constant dilution rate even at different working speeds
Mixing is possible.

Table 1 shows an example of the test results by the basic test device of the liquid agent injection / mixing device of the present invention.

[Table 1]

[0049]

As described above, the injection of the liquid agent of the present invention
According to the mixing device, the following effects can be achieved.

[0050] Simplification of dispensing work, labor saving and improvement of safety In the liquid sprayer of the conventional system, dispensing work was required for each chemical replenishment, whereas in the sprayer using the device of the present invention, the By only filling or replenishing the liquid agent and separate container respectively, no other work is required and the chance of directly touching the drug is reduced, so work is simplified, labor is saved and safety is improved. Can be achieved. Further, unlike the conventional method, since the dispensed chemical liquid does not remain after the spraying work, the problem of residual liquid treatment can be solved. Furthermore, by collecting the liquid agent in the liquid agent container into a predetermined container, the liquid agent can be used separately, so that an effect of reducing the amount of liquid agent used can be expected. It is also possible to use a stock solution container itself as the liquid agent container. In this case, the washing of the stock solution after the work can be omitted, which is labor-saving and the chance of directly touching the drug is reduced, so that the safety is improved.

[0051] Highly efficient and improved runnability of liquid sprayer of traveling system in paddy field The device of the present invention is a paddy field work in which the paddy field water of a paddy field is pumped during work (running) and is used for dilution of liquid agent, etc. It can be used as a device for injecting and mixing liquid agents in a liquid agent sprayer mounted on a vehicle. This liquid agent sprayer does not require replenishment of water for dilution and dispensing work, and the area where continuous spraying can be performed is expanded as compared with the conventional method, so that the work efficiency can be improved. Further, since it is not necessary to equip a large-capacity tank, it is possible to reduce the size of the entire body, and as a result, it is possible to secure stable traveling in the paddy field.

[0052] Applicability to spraying device that sprays at high pressure This device uses the pressure in the fresh water pipe pressurized by the spray pump to pressurize the inside of the cylinder of the liquid agent suction / pumping unit, and Since it has a mechanism that makes the pressure in the injection pipes almost equal, it is possible to inject the liquid agent by simply applying a relatively small driving force to the piston, even for high-pressure pipes such as widely used sprayers. Is possible.

.. Differences from the single-cylinder type liquid agent injection device The single-cylinder type liquid agent injection device, which was developed earlier, also uses the pressure in the fresh water pipe pressurized by the spray pump to inject and mix the liquid agent. However, since it was a method of alternately performing the liquid agent injecting operation and the inhaling operation, the spraying operation is interrupted during the inhaling operation.
By operating the even number of cylinders at the same time, the liquid agent can be injected and sucked simultaneously and continuously. Therefore, the spraying operation can be continuously performed without interruption.

[0054] Simplified and highly accurate adjustment of the liquid agent dilution ratio With this device, the injection amount of the liquid agent is controlled by controlling the moving speed of the piston of the liquid agent suction / pressure feeding section, and based on this, the dilution ratio of the liquid agent is adjusted. Because it is a method of adjusting,
As a power source of the linear motion mechanism that drives the piston of the liquid agent suction / pressure feeding unit, for example, by using a device such as a DC motor whose rotation speed is relatively easy to control, the dilution ratio of the liquid agent can be easily adjusted. It can be performed with high accuracy.

.. Correspondence to a small amount sprayer for spraying paddy field on the ground The recently developed and commercialized small amount sprayer for spraying on the ground in paddy fields is mainly used to prepare a 300-fold diluted solution at 10a.
This is a system for spraying 25 liters per time, but this liquid small amount sprayer uses a spraying device of a system in which the spray amount is obtained in proportion to the working speed, and even at different working speeds,
The spraying amount per unit area is always constant (that is, 25 l per 10a), whereas the device of the present invention determines the working speed of the spraying machine as the rotation speed of the vehicle speed sensor or the axle (or the ground PTO axis). Is detected by a sensor or the like, and a system for controlling the moving speed (that is, the amount of liquid agent injection) of the piston of the liquid agent suction / pressure feeding section based on this is added, so that the above-mentioned spraying device can be supported. .

[0056] Correspondence to field spreaders or fruit tree spreaders This device is applied to the spray pump discharge side system of the pipe spreaders of field spreaders (eg boom sprayers) and fruit spreaders (eg speed sprayers). It can be used by wearing.

[Brief description of drawings]

FIG. 1 is a stroke diagram showing the operation of a liquid agent injection / mixing device according to the present invention and a first stroke of a pipeline system.

FIG. 2 is a process chart showing the second process.

FIG. 3 is a process diagram showing a first process of the liquid medicine injection / mixing device in the case of performing mixed spraying.

[Explanation of symbols]

 1, 2, 3, 12, 13 Branch path 4,7 Left inner side 5,8 Piston 6,9 Right inner side 10 Connecting rod 11 Direct acting mechanism T1 Fresh water tank T2 Liquid agent container S Water inlet (strainer) P Spraying pump Mx injection・ Mixer I Liquid agent suction / pumping unit, F Flow meter (sensor) N Nozzle C1, C2 Liquid agent injection / suction cylinder V1, V2, V3, V4 3-port valve Sw-1 3-port valve switching position detection / operation unit M Direct drive mechanism drive motor Sw-2 Motor rotation speed and direction detection / operation unit Cnt 3 port valve and motor control unit R Working speed detection unit (sensor) Sp Spreader T2-A Liquid A container T2-B Liquid B Container V1-A to V4-A, V1-B to V4-B 3 port valve

Claims (3)

[Claims] 1. A liquid agent such as a bactericidal agent, an insecticide, or a herbicide filled in a container for the liquid agent is mixed into a predetermined concentration by injecting it into a fresh water pipe pressurized by a spraying horn.
In a device for diluting and spraying this mixed and diluted liquid agent to a crop or a field, by moving pistons in a plurality of cylinders in the device, the liquid agent from the liquid agent container is sucked on the suction stroke side. Inhalation is performed, and at the same time, the liquid agent is injected and mixed into the fresh water pipe pressurized by the spray pump on the discharge stroke side, and at the end of both strokes, the moving direction of the piston and the pipeline system are switched simultaneously. As a result, a liquid agent injecting / mixing device is provided, which is provided with a liquid agent inhaling / pumping unit that continuously performs the liquid agent inhaling / injecting / mixing operation until the liquid agent in the liquid agent container runs out. 2. The liquid agent suction / pumping unit equalizes the pressure on the injection side to the fresh water pipeline by pressurizing the suction side of the cylinder using the pressure of the fresh water pipeline, and injecting into the high-pressure fresh water pipeline. The liquid agent injection / mixing device according to claim 1, wherein the mixing is performed with low power. 3. The liquid agent suction / pumping unit is capable of adjusting the concentration of the liquid agent when mixed with fresh water by controlling the moving speed of a piston.
The described liquid agent injection / mixing device.