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用一般铧式犁耕地,存在着一系列严重缺点。其中最主要的是,犁过的土壤还需要进行整地作业,才能达到种植前苗床的要求。这样往往既耗动力,又误农时。因此,把耕地和对土壤进行整地作业两者结合起来乃是发展的方向。目前,我国用铧式犁和其它类型工作部件联合的机具和机组有了很大的发展。这种工作部件可分为自由旋转的(见简图1～5)和强制旋转的两大类(见简图6～10)。第一类型联合犁有滚子犁和圆盘犁。使原来的滑动摩擦变为滚动摩擦,因而减少犁的耕作阻力,提高耕
With the common type of plowland, there are a number of serious shortcomings. The most important thing is that the plowed soil also needs soil preparation work in order to reach the requirement of seedbed before planting. This is often not only power-consuming, but also wrong farming time. Therefore, the combination of arable land and soil preparation work is the direction of development. At present, our country with plow and other types of working parts of the joint machine and the unit has made great progress. This kind of working parts can be divided into two kinds of free rotation (see sketch 1 ~ 5) and forced rotation (see sketch 6 ~ 10). The first type of joint plow has roller plows and disc plows. So that the original sliding friction into rolling friction, thus reducing the plow farming resistance, raising tillage