目前我国各大型机械化农场所拥有的谷物收获机械,几乎全部是苏联制造的牵引式C-6康拜因和自走的C-4康拜因。这些康拜因在土壤湿度不超过20%的土地上作业时表现出良好的通过性。但是,在土壤湿度太大(例如黑龙江省麦收时期正值雨季)的情况下,上述康拜因的通过性就显得非常之低,经常出现陷车现象。这不仅影响小麦的适 At present, almost all grain harvesters owned by various large mechanized farms in China are tracted C-6 combinan and self-propelled C-4 combinan manufactured by the Soviet Union. These combibilities show good passability when working on lands with soil moisture levels of up to 20%. However, when the soil humidity is too high (for example, when the wheat harvest in Heilongjiang Province coincides with the rainy season), the passing of the above-mentioned QBE is very low and the car-sinking phenomenon often occurs. This not only affects the fitness of wheat