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风送式喷雾机的风机速度影响雾滴的沉积分布及喷幅。以D400型风送式喷雾机为试验平台,用染色剂Rhodamine-B与水混合成1g/L浓度的溶液代替农药进行喷雾试验。改变风机供电电源的频率进行喷雾,借助于荧光分光光度计计算雾滴在采样点上的沉积量。结果表明:喷嘴在喷口处不同高度上的分布在喷筒轴向上形成了3个雾滴沉积高峰区;随着风机供电频率的降低,雾滴沉积的高峰区向喷口处移动,沉积高峰区数目及沉积高峰区之间的间距变小;喷幅试验中(44.5～49.5Hz),距离喷筒轴线±2m以内的采样点上雾滴沉积量占喷幅范围内采样点上雾滴沉积总量的百分比的平均值为97.11%,越偏离这部分区域,雾滴沉积量越小,表明风送式喷雾具有很好的方向性,能防止雾滴漂移,且变频喷雾不会改变这一特性;环境自然风对喷口前方前8m以外的雾滴沉积有明显的影响。在实际喷雾作业时,可根据喷施目标物与风送式喷雾机间的距离,调节合适的供电频率,使雾滴主要沉积在目标区域,减少雾滴在非目标区域的沉积;减小喷头位置在高度层间的差异,可以改善喷雾效果。
The fan speed of the air-fed sprayer affects the deposition distribution and spray amplitude of the droplets. D400-type air-fed sprayer for the test platform, with Rhodamine-B staining agent mixed with water to a concentration of 1g / L solution instead of pesticide spray test. Change the frequency of the fan power supply spray, with the help of the fluorescence spectrophotometer to calculate the amount of deposition of the droplet on the sampling point. The results show that the distribution of the nozzles at different heights at the nozzle orifice forms three peak deposition areas in the axial direction of the nozzle. As the frequency of the fan decreases, the peak area of the droplet deposition moves toward the nozzle exit. The number of deposition peak area and the spacing between the smaller; spray test (44.5 ~ 49.5Hz), within ± 2m from the nozzle axis of the droplet deposition on the sampling points within the range of spray droplet deposition The average percentage of the amount of 97.11%, the more deviation from this part of the area, the smaller the amount of droplet deposition, indicating that the wind-type spray has a good direction, to prevent dripping drift, and frequency conversion spray will not change this feature ; Natural wind environment on the front of the nozzle before 8m droplet deposition has a significant impact. In the actual spray operation, according to the spray target and the distance between the wind-fed sprayer, adjust the appropriate frequency of power supply, so that the main droplet deposition in the target area, reducing the droplet deposition in non-target areas; reduce the nozzle Differences in the position of the height of the floor, can improve the spray effect.