教学目标:掌握玉米联合收获机作业前的各项准备工作。1.做好使用前的技术检查(1)彻底清除机具内外的泥土、碎秸秆、杂草等杂物。(2)检查同一回路中的链轮是否在同一回转平面。全面检查并调整链条与三角带的松紧度,使之处于最佳使用状态。(3)检查保养割刀,清除动刀片及定刀片上的 Teaching Objectives: Master corn combine harvester before the operation of the preparatory work. 1. Do a good job before using the technical inspection (1) thoroughly remove the soil inside and outside the machine, broken straw, weeds and other debris. (2) Check if sprockets in the same circuit are on the same plane of rotation. Completely check and adjust the tightness of the chain and the V-belt, making it in the best use. (3) Check the maintenance knife, remove the movable blade and fixed blade