大挖深菊芋收获机设计与试验

针对菊芋收获作业要求，研制了大挖深菊芋收获机。该机由外倾整体式条形挖掘铲、两级抖动链式输送分离器及机架、地轮构成,可一次性完成菊芋挖掘、芋土分离、输送、铺放。田间试验表明：该机能在250~500 mm挖掘深度，初霜冻、菊芋团块根系发达地块，克服冻土块、砾石卡塞导致的土壤拥堵，实现持续稳定作业; 对菊芋收获质量好，芋土分离效果良好，损失率、伤薯率、含杂率分别小于1.75%、4.8%、4.5%, 满足菊芋收获作业要求。

Design and test of Jerusalem artichoke harvester characterized by large dredging depth

According to harvesting need of Jerusalem artichoke, a harvester of Jerusalem artichoke with large dredging depth was developed. The harvester consisted of extraversion integral strip-type digger blade, two-grade jitter-chain-transport separator,and rack and land wheels. The harvester can simultaneously complete digging of Jerusalem artichoke, removing soil, transporting and laying of Jerusalem artichoke. The field test showed that the harvester could realize sustainable and stable operation and dig 250~500 mm deep to overcome soil jam caused by blocking of frozen soil and/or gravels during the first frost in the field and developed dense roots of Jerusalem artichoke. It had good harvesting quality and good separating effect of Jerusalem artichoke from soil. The loss rate, damage rate, and the impurity rate of Jerusalem artichoke were less than 1.75%, 4.8%, and 4.5%, respectively, which meet the need of Jerusalem artichoke harvesting.