In order to improve the working performance and reduce the power consumption,a combine machine SGTN- 180 is designed. The structure design and working characteristics of the combine machine are introduced. The configuration of the double roller position and the design of the power transfer system were mainly analyzed. This combined machine works with a special working pattern that has a front roller forward rolling and a rear roller reversing rolling. The front roller chops the straw and sends the crushed straw to the rear roller. The rear roller breaks the soil and returns the straw-soil mixture to the ground. The experimental results indicate that the combined straw returning-rotary tillage-fertilization machine has a fine working quality, which is characterized by the quality indexes as follows: vegetation coverage 94.8％, soil broken rate 93.1％, surface smoothness after working 0.4 cm, stability coefficient of tillage depth 97.2％ ,and a banding distribution of fertilizer mixed with soil in depth of 2- 11 cm.%针对现有秸秆还田机械存在的正转秸秆还田机械覆盖性较差、功能单一,需多次作业才能满足农艺要求;而反转秸秆还田机械刀辊前方壅土严重,功耗较大等问题,设计了SGTN-180型旋耕埋草施肥联合作业机.该联合作业机采用双辊配置:前辊正转,进行秸秆粉碎;后辊反转旋耕,完成秸秆翻埋和碎土作业的独特作业模式,有效提高覆盖性能和降低功耗;并设计有施肥装置,完成播种前土壤整备的联合作业.鉴定检测试验结果表明:该旋耕埋草施肥联合作业机可一次性实现秸秆粉碎还田、旋耕碎土、施肥等多项作业,具有较好的耕作质量:作业后,植被覆盖率94.8%、碎土率93.1%、耕后平整度0.4 cm、耕深稳定性97.2%,肥料在2～11 cm耕层内与土壤混合,呈条带状分布.
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