鸡心夹具在车床与磨床上普遍使用。过去我们的操作通常采用螺钉直接顶紧工件 ,这样既费力又不方便 ,尤其是批量生产时 ,更显繁琐。为此 ,我们对原有鸡心夹具做了改进（如附图所示） ,具体操作时先将拨杆顺时针转动 ,把轴套入夹具内 ,用机床顶尖顶紧工件 ,这样机床开动时 ,拨杆 Jixin jig in the lathe and grinder commonly used. In the past, we usually screwed the workpiece directly with screws, which was laborious and inconvenient, especially when mass-produced. To this end, we made improvements to the original Jixin jig (as shown in the figure), the specific operation of the first lever clockwise rotation, the shaft sleeve into the fixture, top tight with the top of the machine tool, so that when the machine starts, Lever