| 摘要 |
PROBLEM TO BE SOLVED: To provide a chemical liquid application controller which uniformizes the concentration of the chemical liquid to be spread of a chemical liquid applicator to be installed on a working car such as a tractor, eliminates the delay in starting the spreading and makes the flow rate of the chemical liquid spreading adequate. SOLUTION: The regulation of the amount of the spreading of the chemical liquid to be spread from a spreading boom 19 is performed by controlling a flow rate by a variable flow rate control valve 59 so as to attain the chemical liquid spreading pressure value obtained by adding in the detected values of a vehicle speed sensor 93 and a pressure sensor 86 when an operator inputs the chemical liquid volume set value to a CPU 105 by a chemical liquid volume setting switch 94. When a discharge pressure of a prevention pump 20 is elevated by an increase in the number of revolutions of an engine after the spreading control of the chemical liquid starts, the internal pressure in a liquid entry line 52b can be maintained at the specified pressure or below by a safety valve 89 disposed in a return line 60. Further, when the discharge pressure of the prevention pump 20 is elevated by the increase in the number of revolutions of the engine, the chemical liquid circulates into the second return line 61 and the internal pressure in the liquid entry line 52b can be maintained at the specified pressure or below.
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