安徽农业科学2011，Vol.39Issue(16)：9861-9863,3.
菠萝自动采摘机的结构设计
Structure Design of Automatic Pineapple Picking Machine
摘要
Abstract
[ Objective ] The research aimed to discuss the formation reason of cold rain and snow frozen disaster weather event in Guizhou in 2008. [Method] By using T213, ECMWF numerical forecast data and the conventional meteorological observation data which were provided by MICAPS, according to the variation situations of frozen rain, freezing, road freezing and ground surface 0 ℃ line range, the weather situation evolution characteristic of cold rain and snow frozen weather process (congeal for short) in Guizhou from January 13 to February 15, 2008 was analyzed. The formation reason of cold rain and snow frozen disaster weather event in Guizhou was discussed, and the defense counter-measure was put forward. [ Result] The cold rain and snow frozen weather process happened when the continuous precipitation was caused by that every scale weather system intersected over Guizhou under the background that the atmospheric circulation was abnormal. East Asian inverted Ω flow type in the northern hemisphere made that the atmospheric circulation stabilized for a long time. The north branch frontal zone was by south, and the polar cold air continued to add and went south to affect Jiangnan, South China. The south branch westerly fluctuation was active, and the intensity of stationary front frontal zone was big, which maintained for a long time. 850 hPa shear line in the low level maintained swaying in the junction of Guangxi and Guizhou, Hunan. The southwest warm and wet airflow continued transporting to the south of China. The cold and warm air intersected over South China, which caused the long-time precipitation in Guizhou. The thermal inversion layer was deep and thick. The long-time precipitation was based generally on the light rain, which was easy to form the supercooled water droplet. The verglas range expanded from Guizhou, the south of Hunan to the north of Guangxi. The frozen rain and frozen weather caused the longtime road and wire freezing, and the disaster was serious. The ground surface temperature 0 ℃ line covered the cold mountain area in the whole province. The ground surface freezing was difficult to melt, and the cold rain and snow frozen weather affected Guizhou for a long time. [ Conclusion ] The research accumulated the experience for the disaster prevention and reduction of such weather.关键词
菠萝采摘/结构设计/参数优化Key words
Frozen disaster/ Formation reason analysis/ Disaster defense/ Guizhou分类
农业科技引用本文复制引用
张日红,施俊侠,张瑞华..菠萝自动采摘机的结构设计[J].安徽农业科学,2011,39(16):9861-9863,3.基金项目
广东省科技基金项目(2008B021200001) （2008B021200001）
广东省农业机械化发展议案项目. （）
