水稻种子风筛精选加工中筛片组合孔径比参数研究

本研究旨在确定水稻风筛精选中筛片组合关键参数,提高加工的水稻种子的净度和发芽率,进而提高种子的使用价值和商品价值。以云南省籼稻、粳稻2个类型的18个主栽水稻品种的种子为材料,在测定其种子的粒径比基础上,用进口的LA-LS小型风筛精选机设备,开展风筛精选加工中不同筛片组合参数试验研究。结果表明：粳稻种子平均粒径比为1.40,籼稻种子平均粒径比为1.33;种子粒径比、下/上筛片孔径比（以下简称筛片孔径比）与净度及获选率之间呈线性关系;满足粳稻进行精选加工的上层筛片尺寸为2.60mm,下层筛片尺寸范围为1.70～1.90mm,最佳筛片孔径比为0.73。适于籼稻进行精选加工的上层筛片尺寸范围为2.25～2.60mm,下层筛片尺寸范围为1.50～1.90mm,最佳筛片孔径比为0.63。本研究获得的筛片组合关键参数在加工能力为4t/h的CIMBRIA DELTA SUPER 104型种子加工精选设备上进行验证,获得了加工种子质量和生产效率同步提高的效果,研究结果为水稻种子风筛精选加工和标准化处理提供了重要的技术支持。

Hole ration parameters of combination of sieves onair-and-screen processing of rice seed

The study was aimed at finding out the seed processing key parameters of combination of sieve on air-and-screen to improve the value of processed rice seed by increasing purity and germination percentage.The rice seeds of 18 mainly cultivated varieties of indica and japonica were collected in Yunnan province.On the basis of the seed size being measured,the key parameters were studied by utilizing the combination of processing sieve with different hole size at the LA-LS small type air-screen separation machine imported.The results showed that the average rice seed size of japonica is 1.40,and of indica is 1.33.It was found that the seed size,the combination of sieves with different hole size,the seed purity and the separation rate were linearly correlated.For Japonica rice finely separating,the hole size of the top sieve was 2.60 mm,the hole size range of bottom sieve was 1.70-1.90 mm.The optimal sieve hole ration of top and bottom sieve was 0.73.For indica rice seed finely separating,the top sieve hole size range was 2.25-2.60 mm,for the bottom sieve hole was 1.50-1.90 mm,and the optimal sieve hole ration of top and bottom sieve was 0.63.The separating technical parameter from this study was tested by industrial seed processing machine CIMBRIA DELTA SUPER 104 which can process 4 t/h of rice seeds.The test results proved the validity of key parameters of combination of sieve which can contribute to improve the quality and efficacy of seed processing and provide the important technical support for rice seed air-screen finely separation and standardized processing.