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在平面四连杆机构中,曲柄、摇杆及滑块分别作转动、摆动及移动,而连杆作复杂的平面运动,其上各点的轨迹——连杆曲线是各式各样的。我们利用连杆曲线上的近似圆弧或直线部分,在连杆和机架上并接一基本杆组(由两构件和三低副组成),可使从动件获得多种型式的间歇运动。这种机构与凸轮机构等比较,其机件制造简便,并能适应较高速度运转。所以,这种机构已在喷气织机、经编机及食品加工等机器中得到较多的应用。但是,这种机构设计比较复杂,在某种程度上限制了它更广泛的应用。下面介绍这种机构所能实现的几种主要间歇运动以及各自的特点,并简述其中典型机构的设计计算方法。读者若以此类推,就不难设计其它类似机构。
In the plane four-bar linkage, the crank, rocker and slider are respectively rotated, swung and moved, while the connecting rod is used for complicated plane motion. The trajectory-connecting rod curve of each point on the plane is varied. We use the connecting rod curve of the approximate arc or linear part of the connecting rod and the frame and connected to a basic rod group (composed of two components and three low-side), the follower can obtain a variety of types of intermittent exercise . Compared with the cam mechanism and other institutions, the parts are easy to manufacture, and can adapt to high-speed operation. Therefore, this mechanism has been more applications in jet looms, warp knitting machines and food processing machines. However, the design of such a mechanism is rather complicated, to a certain extent, limiting its wider application. Here are some of the major intermittent motions that can be achieved with this mechanism, as well as their respective characteristics, and a brief description of the design and calculation of a typical mechanism. Readers and so on, it is not difficult to design other similar institutions.