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车床上夹紧工件通常采用机械夹紧机构,夹紧机构常为旋转型气动或液压卡盘,其缸体紧固在车床主轴的后端,并通过主轴孔以专用拉杆与卡盘连接。由于气动系统的压缩空气的气压受到限制,气缸不能产生较大的夹紧力,而且要加大外形尺寸,而加大外形尺寸使机床的动平衡及装配困难。其液压缸结构紧凑,但是旋转部份供油较困难,
Lathe clamping the workpiece is usually used mechanical clamping mechanism, the clamping mechanism is often rotary pneumatic or hydraulic chuck, the cylinder body is fastened to the back end of the lathe spindle, and through the spindle hole with a dedicated lever and the chuck connection. As the pneumatic system of compressed air pressure is limited, the cylinder can not produce a greater clamping force, but also to increase the size, and increase the size of the machine so that the dynamic balance and assembly difficulties. The hydraulic cylinder structure is compact, but the rotating part of the oil supply is more difficult,