论文部分内容阅读
在简谐运动机构和正置曲柄滑块机构中,当主动件作等角速回转时,从动件往、返两行程所占用的时间是相同的.但是,某些执行机构需要在工作行程时缓慢一些,而在返回行程时急速退回原处,以提高其工作效率.具有这种运动特性的机构统称为急回运动机构.凸轮机构和连杆机构均可用作急回运动机构,通常,凸轮机构应用于从动件时尚需实现某种复杂运动规律的场合,这在《机械原理》中已有详述;而连杆机构具有制造简便、传动平稳等特点,在工程上也获得广泛应用.现介绍具有急回运动的连杆机构的特点、限制因素及其应用场合。
In the simple harmonic motion mechanism and the positive crank slider mechanism, when the active part rotates at equal angular velocity, the follower takes the same time to and return to the two-stroke, however, some actuators need to work at the working stroke Slow, and in the return trip quickly returned to improve their work efficiency.Active with this movement of the body collectively referred to as the emergency return mechanism.Cam mechanism and the link mechanism can be used as emergency return mechanism, usually, The application of the cam mechanism to the follower fashion needs to realize a certain complex movement law, which has been described in detail in “Mechanical Theory”; while the link mechanism has the advantages of simple manufacture, stable transmission and the like, and is also widely applied in engineering The features, limitations and applications of the linkage with snap back motion are described.