在中职《机械基础》课程中,四杆机构的内容要求并不多,但却是个重点,这部分内容要求掌握铰链四杆机构的三种基本类型及其判别方法、铰链四杆机构的运动特点及应用、急回和死点运动特性以及铰链四杆机构的演化机构。这里面基本类型及其判别方法、急回和死点是掌握的重点。在教学中,我实践了以下几点: In mid-level “mechanical basis” course, four-bar mechanism content is not much, but it is an important point, this part requires to master the three basic types of hinged four-bar mechanism and its identification method, hinge four-bar mechanism movement Features and applications, quick-return and dead-end movement characteristics, and evolutionary mechanism of hinged four-bar mechanism. The basic types and their discriminating methods, emergency and dead spots are the key points to be grasped. In teaching, I practice the following points: