重庆第二纺织机械厂铸造车间,曾使用过曲柄一摇杆式和曲柄一滚轮式两种类型的筛砂机。前者曲柄采用标准曲柄连杆机构,后者偏心机构采用偏心轮与偏心套滑动摩擦。在使用中这两种类型的筛砂机共同的问题是:构件磨损速度快、使用寿命短、生产效率低、噪声高,尤其是后者,当支承筛框的四个滚轮磨损后, Chongqing Second Textile Machinery Factory foundry, had used a crank crank and a roller wheel type two types of screen sand machine. The former crank with a standard crank linkage, the latter eccentric mechanism eccentric roller and eccentric sliding friction. The common problems with these two types of screen sanding machines in use are as follows: component wear speed, short service life, low production efficiency, high noise, especially the latter, when the four rollers supporting the screen frame are worn,