PROBLEM TO BE SOLVED: To enable working by approaching the tip end of a boom to the surface of a field in liquid agent-spraying work with a boom sprayer, by reducing the sway of the tip end of the boom even in the case of performing faster working by using a longer boom.SOLUTION: A boom-rocking support mechanism (4) includes an elongating and contracting cylinder (40) one end of which is pivoted at a central machine body (2A) side and another end of which is pivoted at the boom (3) side, and the elongating and contracting cylinder has a vibration-damping means capable of flexibly bending the boom and the axial supporting part (30) of the central machine body against the vibration of the central machine body at a high acceleration in a state of fixing and supporting the boom at the central machine body, and also imparting a resistance according to a returning speed against flexible return to the bending.COPYRIGHT: (C)2010,JPO&INPIT【課題】ブームスプレーヤによる液剤散布作業において、より長いブームを用いてより速く作業を行う場合であってもブーム先端の振れを小さくして、ブーム先端をより圃場面に近づけた作業を可能にする。【解決手段】ブーム揺動支持機構(4)は、一端が中央機体(2A)側に軸支され他端がブーム(3)側に軸支された伸縮シリンダ(40)を備え、伸縮シリンダは、ブームを中央機体に固定支持した状態で、中央機体の高加速度での振動に対してブームと中央機体の軸支部(30)を弾性的に屈折させると共に当該屈折に対する弾性な戻りに対して戻り速度に応じた抵抗を付加する制振手段を備える。【選択図】図1
