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为了获取秧草收割物的悬浮速度参数,采用DFPF-25型悬浮速度试验装置对结荚期、初花期和分枝期秧草收割物主要成分的悬浮速度进行测定,并采用对比试验分析了叶子和茎秆对悬浮速度的影响。结果表明,3个时期的收割物对应成分的悬浮速度中,结荚期最大,初花期次之,分枝期最小;3个时期的最大悬浮速度依次为4.238、3.736和2.653 m·s-1;同一时期的各成分间的悬浮速度有重叠,表明收割物的飞行系数相近,气流较难将其分离,说明气流分选不可行。对比试验表明,去叶前后秧草收割物的悬浮速度变化率与叶子质量占比的比值为1.225~3.745,说明叶子对收割物的悬浮速度的影响比茎秆对悬浮速度的影响大。该研究结果可为秧草收获机的收集装置和分选装置的设计提供参考和依据。
In order to obtain the suspension speed parameters of seedlings harvested grass, DFPF-25 levitation speed test device was used to measure the suspension speed of the main components of seedlings harvested at podding stage, early flowering stage and branching stage. And stems on the suspension speed. The results showed that among the three crops, the maximum podding stage was the highest podding stage, followed by the first flowering stage and the smallest branching stage. The maximum suspended speed of the three stages was 4.238, 3.736 and 2.653 m · s-1, respectively In the same period, there was an overlap between the suspending speeds of all the components, indicating that the flying factors of the harvested material were similar and the air flow was more difficult to separate, which indicated that the air separation was not feasible. The comparative tests showed that the ratio of the rate of change of the suspension speed of seedlings to the mass of leaves was 1.225 ~ 3.745 before and after defoliation, which showed that the effect of leaves on the suspension speed of the harvested material was greater than that of the stem on the suspended speed. The results of this study can provide reference and basis for the design of the collection device and sorting device of the seedling harvesting machine.