目的 设计一种用于实际生产的以PLC为控制器的生物检测卡柔性热封系统，用于灌装检测液和玻璃微珠生物检测卡的自动封装。方法 用SolidWorks绘制热封系统零部件的机械结构，并建立热封系统的装配体。对装配体进行干涉分析，修改有干涉冲突的零部件。确认无干涉冲突后，完成对热封系统机械结构的设计。根据工艺要求确定各执行机构运行的先后顺序，画出程序流程图，用顺序控制设计法编写程序。结果 在实际生产中，热封系统封装单张生物检测卡需要4.9993 s，封装速度满足设计要求。结论 热封系统可以快速完成对生物检测卡的封装，且封装密封性好、封膜边缘平整，能够满足生产的要求。

The work aims to design a flexible heat sealing system of bioassay card based on PLC for practical production and apply it to the automatic encapsulation of bioassay card filled with detection liquid and glass bead. SolidWorks was used to draw the mechanical structure diagram for the parts of the heat sealing system and the assembly of the heat sealing system was established. The assembly was subjected to interference analysis while parts with interference conflict were modified. The mechanical structure of the heat sealing system was designed when it was confirmed that there was no interference conflict. The order of actions of actuating mechanisms was determined according to technological requirements. The program flow chart was drawn and the program was written in the method of sequential control design. In actual production, it would take 4.9993 s for the heat sealing system to encapsulate a single bioassay card. The encapsulation speed met the design requirements. With the heat sealing system, the bioassay card can be quickly encapsulated. Moreover, the encapsulation tightness is good, and the sealing film edge is smooth, which can satisfy the production requirements.