关键词: 菠萝叶, 粉碎, 还田机, 设计, 试验分析

Abstract: Because pineapple is closely planted, and has thick and heavy stem and leaf, containing rich and tough fiber, the existing pineapple leaf shattering and returning field machines have to work twice to achieve shattering result. Thus, there was problems such as difficult operation, low efficiency, high energy consumption, and soil compaction, etc.. In order to solve these problems, this paper designed a twin-roller pineapple leaf shattering and returning field machine. It had 2 rollers in structure with joint-operating of improved L-shaped flail knife, straight knife and fixed knife, capable of achieving required shattering effect through beating and chopping repeatedly in one pass of field operation. Field trials showed that the pass rate ( the rate of pineapple leaf pieces with length less than 15 cm in total amount ) reached 90.8%, with a standard deviation of 0.79 and coefficient of variation of 6.22. And 89.3% of pineapple stubbles was equal to or less than the required height above soil, with a standard deviation of 1.43 and coefficient of variation of 9.76. The productivity was 0.356 hm2/h, fuel consumption was 54.14 kg/hm2, and distributing unevenness was 0.59. This machine could work  with good reliability and stability and its production index all reached design requirements and could met the actual needs of agronomy.

Key words: pineapple leaf, crushing, returning machinery, design, test analysis