目的 设计一种由PLC控制的空调内机包装机，实现机器替代人工的目标。方法 通过分析空调内机的包装生产过程，采用SolidWork软件分别建立空调内机定位、取泡沫垫、泡沫垫供给、包装箱供给和装箱等的三维模型，并对组成各机构的零部件进行机械设计。利用西门子S7-200 SMART PLC控制各个机构的步进电机和气缸的协调运作，实现空调内机的全自动包装。结果 该包装机能对3种不同规格的空调内机进行全自动的包装。结论 该包装机解决了空调内机全自动包装的难题，实现了机器替代人工的目标，提高了生产效率，并且该包装机能对多种不同规格的空调内机进行包装，具有广阔的应用前景。

The work aims to design an A/C internal unit packaging machine controlled by PLC, so as to achieve the goal that machine replaces manpower. By analyzing the process of producing packages for A/C internal unit, SolidWork software was used to respectively establish 3D models with respect to positioning of A/C internal unit, taking foam pad, supplying foam pad and packaging box and boxing, etc. Meanwhile, the mechanical design of the parts comprising all the mechanisms was made. S7-200 SMART PLC was adopted to control the coordinated operation of stepping motor and cylinder of each mechanism, so as to achieve the automatic packaging of A/C internal unit. The packaging machine could automatically package A/C internal units of three different specifications. It is concluded that the packaging machine has solved the problem of automatic packaging of A/C internal unit, which has achieved the goal that machine replaces manpower and improved the production efficiency. Moreover, the packaging machine can package A/C internal units of various specifications and it has broad application prospects.