JPH09155259A - Running liquid spraying device - Google Patents

Abstract

(57) An object of the present invention is to provide a traveling liquid spraying device capable of keeping a liquid spraying amount per unit area at a predetermined value corresponding to a slip ratio generated during traveling spraying work. A liquid recirculation bypass (21) is provided in a discharge passage (3) of a pump (2) via a flow rate adjusting valve (20), an opening of the flow rate adjusting valve (20) is adjusted according to a degree of slip, and excessive spraying per unit area is performed. Prevent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling liquid spraying device which is particularly effective as a boom sprayer for spraying agricultural chemicals.

[0002]

2. Description of the Related Art A pesticide spraying boom sprayer as an example of the traveling liquid spraying device is, for example, a spraying liquid storage tank (hereinafter referred to as "pesticide storage tank") and a liquid in the tank. A large number of liquid spray nozzles (hereinafter referred to as "pesticide spray nozzles") behind and on the left and right of the traveling machine equipped with a pump for pumping (hereinafter referred to as "pesticide").
A plurality of liquid spraying booms (hereinafter referred to as "agricultural chemical spraying booms") are provided so as to be foldable, and the left and right agricultural chemical spraying booms are expanded or folded according to the spraying width. Used in.

Then, the pump is operated while the traveling machine is running at a predetermined speed, and the pesticides in the tank are sprayed from the pesticide spraying booms at a predetermined pressure to efficiently unitize in a vast field. A certain amount of pesticide is sprayed evenly per area.

Recently, due to phytotoxicity and other circumstances, there is a tendency to spray a small amount of pesticide, for example, 25 liters per 10 ars. Strict adherence is emphasized.

Therefore, from the viewpoint of strictly observing the amount of application per unit area at various application sites, for example, even if there is a pesticide application boom for which application has been stopped to narrow the application width, application is stopped. Do not change the amount of spray from other pesticide spraying booms.

Therefore, the applicant of the present invention connects the plurality of pesticide spraying booms to the discharge passages of the pumps via the three-way cocks, and connects one outlet passage of each of the three-way cocks to each of the outlet paths. Connected to the agrochemical storage tank via an orifice that regulates the flow rate corresponding to the spray amount from the pesticide spraying boom, and spraying the pesticide corresponding to the spray amount from the one boom that has stopped spraying, A liquid spraying device configured to be returned to the liquid storage tank has been proposed (see Japanese Utility Model Laid-Open No. 5-63666).

[0007]

In the pesticide spraying boom sprayer as described above, the discharge capacity of the pump is proportional to the number of revolutions of the airframe running engine in order to keep the spraying amount determined per unit area. It is composed.

In other words, in other words, the traveling speed of the airframe
The amount of pesticide sprayed by the pump is proportional to the pump. Therefore, when the traveling speed of the aircraft is accelerated, the amount of pesticide sprayed increases in proportion to the traveling speed, and as a result, the amount of pesticide sprayed per unit area is constant. .

However, when the above-mentioned pesticide spraying boom sprayer is run in a field, since the running ground is generally soft, slippage is often involved to some extent.

If slippage occurs during the traveling work of spraying the agricultural chemicals, there occurs a phenomenon that the traveling speed does not rise in proportion to the rotation speed of the machine body traveling engine. As a result, only the traveling speed (vehicle speed) is reduced, even though the rotation speed of the airframe traveling engine does not change, and the amount of pesticide sprayed per unit area exceeds a predetermined amount.

In order to solve the above-mentioned phenomenon, the rotation speed of the airframe running engine is automatically reduced according to the slip state during running, that is, the effective speed, or the pump speed is set separately from the rotation speed. It is conceivable to provide a mechanism for automatically changing and controlling the discharge capacity. However, providing such a mechanism inevitably results in a significant cost increase.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to solve the above problems with an extremely simple and inexpensive structure.

[0013]

In order to solve the above-mentioned problems, the present invention provides a conventional mechanism, that is, maintaining the proportional relationship between the number of revolutions of a machine for running an aircraft and the discharge capacity of the pump, and discharging the pump. Of the applied pesticides, excess pesticide equivalent to slip is returned to the pesticide storage tank to keep the amount of pesticide sprayed per unit area at a predetermined value. That is,
In a traveling liquid spraying device of a conventional mechanism, a liquid recirculation bypass (hereinafter referred to as "agricultural chemicals recirculation bypass") is connected to a liquid storage tank from an appropriate position in the discharge path of the pump via a flow rate adjusting valve. .

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of piping of a pesticide spraying boom sprayer, and FIG. 2 is a plan view of an operation handle portion of a flow rate adjusting cock.

A pump 2 such as a high-pressure plunger pump is connected to the bottom of the agricultural chemical storage tank 1, and a discharge passage 3 of the pump 2 is connected.
1 and three branches in FIG. 1, and pesticide spraying booms 10, 11 and 12 are connected to the respective branch passages 4, 5 and 6 via three-way cocks 7, 8 and 9, respectively.

The above-mentioned pesticide spraying booms 10, 1
1 and 12 are provided with a proper number of pesticide spray nozzles 13 at appropriate intervals.

Further, each of the three-way cocks 7 and 8 described above is used.
And 9 and 9 respectively have one outlet path 14, 15 and 16
Orifices 17 and 18 that regulate the flow rate corresponding to the amount of spray from each pesticide spraying boom 10, 11 and 12.
And 19 to the pesticide storage tank 1 via lines 23, 24 and 25.

Further, in the present invention, the pesticide is returned to the pesticide storage tank 1 from the discharge passage 3 between the pressure regulating safety valve 22 of the pump 1 and the three-way cocks 7, 8 and 9 through the flow rate adjusting valve 20. For bypass 21 is connected.

The flow rate adjusting valve 20 is preferably a needle valve, for example, 0 to 20% of the field where spraying is performed.
The flow rate can be changed within the slip ratio range. Specifically, as shown in FIG. 2, a guide display 23 showing a slip ratio is provided around the operation handle 20a of the flow rate adjusting valve 20 having a rotation range of 250 to 300 degrees, and, for example,
A liquid containing 0 to 3 liters / min of the pesticide storage tank 1
It is configured so that it can be refluxed to.

The pressure regulating safety valve 22 is a pressure regulating safety valve which is provided in the discharge passage 3 and is released at a shutoff pressure of 50 kg / cm ² , for example.

The liquid spraying device having the above-mentioned structure sprays the pesticide in the pesticide storage tank 1 by the pump 2 by a plurality of pesticide spraying booms 10, 11 and 12.
Three-way cocks 7, 8 and 9 provided in each branch 4, 5 and 6
When a pesticide or the like is sprayed from any of the pesticide spraying booms 10, 11 or 12 by operating, a predetermined amount of spray is always sprayed.

That is, a pesticide spraying boot whose spraying has been stopped.
The amount of pesticide corresponding to the amount of spray from the system 10, 11 or 12 is returned to the pesticide storage tank 1 through the respective orifices 17, 18 or 19 and the other pesticide spraying booms 10, 11 are supplied. Alternatively, even if the spraying width is changed, the spraying amount per unit area can be maintained without affecting the spraying amount of 12.

However, when the above device is mounted on the traveling machine body and used as a traveling liquid spraying apparatus, when slip occurs during the traveling work as described above, the effective speed of the traveling machine body decreases and the unit area per unit area is reduced. The amount applied is greater than the specified amount.

Therefore, according to the present invention, the operation handle 20 of the flow rate adjusting valve 20 is previously set in accordance with the slip condition in the field.
By operating a, a part of the pesticide discharged from the pump 2 is returned to the pesticide storage tank 1 through the pesticide recirculation bypass 21.

As a result, all of the pesticide discharged from the pump 2 is not supplied to the pesticide spraying booms 10, 11 or 12, and the surplus is returned to the pesticide storage tank 1 and per unit area. It is possible to prevent the spraying amount of the water from exceeding a predetermined spraying amount.

The opening of the flow rate adjusting valve 20 is adjusted by
As described above, the operating handle 20 is adjusted according to the slip ratio.
This is done by changing the position of a. Further, the slip ratio can be determined in consideration of the condition of the traveling ground or by adding an empirical rule.

[0027]

According to the present invention, the amount of pesticide sprayed per unit area can be maintained at a predetermined value simply by adjusting the opening of the flow rate adjusting cock even on a running ground where slip occurs, and a mechanism therefor is also provided. Extremely simple and inexpensive.

[Brief description of the drawings]

FIG. 1 is a schematic view of piping in a pesticide spraying boom sprayer.

FIG. 2 is a plan view of an operation handle portion of a flow rate adjusting cock.

[Explanation of symbols]

 1 Liquid Storage Tank 2 Pump 3 Discharge Path 7, 8, 9 Three-way Cock 10, 11, 12 Liquid Dispersion Bom 14, 15, 16 Outlet Path 17, 18, 19 Orifice 20 Flow Control Valve 21 Liquid Reflux Bypass

Claims (1)

[Claims] 1. A plurality of booms (1) for spraying liquid are provided in a discharge passage (3) of a pump (2) connected to a liquid storage tank (1).
0), (11), (12) are connected via three-way cocks (7), (8), (9), respectively, and one of the three-way cocks (7), (8), (9) is connected. An orifice (17) for restricting the outlet passages (14), (15), (16) to a flow rate corresponding to the spraying amount from the respective liquid spraying booms (10), (11), (12), (1
8) and (19), and is connected to the liquid storage tank (1), and the pressure regulating safety valve (2) of the pump (2) is connected.
A liquid recirculation bypass (1) to the liquid storage tank (1) from the discharge passage (3) between the two (2) and the three-way cocks (7), (8) and (9) via the flow rate adjusting valve (20). 21) The running liquid spraying device characterized in that it is connected.