根据实践第一的观点,必须抓住研制收获机的主要矛盾,才能解决收获机中的关键性问题。收获油莎豆过程中,同时存在着豆、根茎草、土和石块等因素。将豆取出就必须清除土、根茎草和石块等杂质。在这三种杂质中,由于土方量大,如果没有足够的筛分面积和良好筛子型 According to the practice of the first point of view, we must seize the main contradiction in the development of harvesters in order to solve the key problems harvester. Salad oil harvest process, there are beans, rhizome grass, soil and stones and other factors. Remove the beans must be cleared of soil, rhizome grass and stones and other impurities. Among the three impurities, due to the large amount of earthwork, if there is not enough sieve area and good sieve type