PROBLEM TO BE SOLVED: To optimize a supply voltage depending on the kind of a nozzle part and to improve efficiency of spray operation in a spray working machine of electrostatic nozzle shape.SOLUTION: In the chemical spray working machine equipped with a conductive part (50) in the vicinity of a spray nozzle (16) of a center boom (12) and in the vicinities of spray nozzles (18) of right and left side booms (13) and a high-voltage power source apparatus (51) for supplying a high voltage to the conductive part (50), the chemical spray working machine includes nozzle part determination means (R1 and R2) for determining nozzle parts (N1, N2 and N3) in a use state and optimizes a voltage supplied from the high-voltage power source apparatus (51) on the basis of the determination of the nozzle part determination means (R1 and R2). The nozzle determination means is a means for directly detecting positions of the rotating nozzle parts (N1, N2 and N3) or a means for estimation by setting of a spray amount.COPYRIGHT: (C)2012,JPO&INPIT【課題】静電ノズル形態の散布作業機において、ノズル部種類に応じて給電圧を適正化して噴霧作業の効率化を図る。【解決手段】センタブーム(12)の噴霧ノズル(16)の近傍、及び左右サイドブーム(13)の噴霧ノズル(18)の近傍に導電部(50)を配設し、前記導電部(50)へ高電圧を供給する高電圧電源装置(51)を設けた薬液散布作業機において、使用状態にあるノズル部(N1,N2,N3)を判定するノズル部判定手段(R1,R2)を備え、このノズル部判定手段(R1,R2)の判定に基づいて、高電圧電源装置(51)から供給される電圧を適正にする。ノズル部判定手段は、回動するノズル部(N1,N2,N3)位置を直接検出する手段、又は散布量設定で推定する手段等がある。【選択図】 図11
