Fluid sprinkling – spraying – and diffusing – With selective proportioning or correlated flow for plural... – Having traversing motion responsive means
Patent
1989-09-26
1991-05-14
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
With selective proportioning or correlated flow for plural...
Having traversing motion responsive means
239142, 239156, 239172, 239405, A01M 700
Patent
active
050149148
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an apparatus for agricultural sprayers for spreading pesticides on fields and plants, e.g. on standing crops, in orchards, or in vineyards, comprising at least one pesticide container, a dosage pump for the container or the containers, respectively, or for each container, and a control unit for adjusting the pump flow or the pump flows, respectively, in dependence on definite parameters, the driving speed being one.
2. Description of the Prior Art
Dose control apparatus of this type is used on agricultural sprayers which in the tank provided thereon carry not a mixture of plasticide and water in a predetermined mixture ratio but pure water only, the pesticide being admixed to the water flow to one or more nozzle ramps. The advantage of this system is primarily that the dosage, i.e. the mixture ratio between water and pesticide can be changed during driving of the sprayer to be adjusted to local variations in the need of pesticide on the field or plant region which is being treated, and that the tank of the sprayer contains pure water and will never be contaminated by pesticide so that it is not necessary to clean the tank when changing from one pesticide to another or at changeover Lo spreading of other substances than pesticides, such as fertilizers.
In known embodiments these dose control apparatuses do not operate in a satisfactory way, however, because the precision of the dose control is deficient so that the mixture ration cannot be adjusted and maintained with the accuracy required and the mixture of water and pesticide will not be homogeneous so that the pesticide concentration will vary in different parts of the nozzle ramp or ramps.
SUMMARY OF THE INVENTION
The purpose of the invention is to provide a dose control apparatus which operates with a closed system and provides a homogeneous mixture of pesticide and water at an accurately adjustable and reproducible dose control of the pesticide.
In this connection an accurately adjustable and reproducible dose control means that the dosage of pesticide determined for a specific purpose of the spraying shall be kept constant within close limits with a variation of the pesticide which is of a maximum order of 0.5%, and with the possibility of reproducing the adjustment within the same limit values, in order that too much or too little pesticide will not be supplied to the ground or the plants but just the amount considered optimal because too much pesticide overloads the environment and to little pesticide may give a reduced or event spoiled harvest.
By making the mixture homogeneous detrimental local concentrations of the pesticide on the ground or on the plants by uneven distribution of the pesticide from the nozzle ramp or ramps will be avoided.
The dose control apparatus being a closed system means that the personnel handling the sprayer will not contact the pesticide and that the pesticide cannot be deposited outside the dose control apparatus through other channels than via the nozzle ramp or ramps. Thus, extensive requirements with regard to protection of personnel and environment can be met.
BRIEF DESCRIPTION OF THE DRAWINGS
In order to explain the invention in more detail an embodiment thereof will be described below reference being made to the accompanying drawings in which
FIG. 1 is an elementary diagram of the dose control apparatus of the invention,
FIG. 2 is an axial cross sectional view of the mixing chamber included in the dose control apparatus,
FIG. 3 is a cross sectional view of the mixing chamber in FIG. 2, and
FIG. 4 is a block diagram of the control unit.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
In FIG. 1 the dose control apparatus of the invention is shown together with those elements of the sprayer which are connected to the dose control apparatus but do not form part thereof. The portion of the dose control apparatus, operating with liquid, being located inside a dot-and-dash line and the connected elements of the sprayer being loca
REFERENCES:
patent: 3853272 (1974-12-01), Decker et al.
patent: 4714196 (1987-12-01), McEachern et al.
patent: 4721245 (1988-01-01), van Zweeden
Kashnikow Andres
Merritt Karen B.
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