日本SMC双联气缸缸筒的内径大小代表了气缸输出力的大小。活塞要在缸筒内做平稳的往复滑动，缸筒内表面的表面粗糙度应达到Ra0.8um。对钢管缸筒，内表面还应镀硬铬，以减小摩擦阻力和磨损，并能防止锈蚀。缸筒材质除使用高碳钢管外，还是用高强度铝合金和黄铜。
SMC双联气缸因为结构简单，使用便捷等众多的优点，而被应用到各行各业当中。我们日常见的气缸主要有活塞，气缸盖，还有缸筒等部件组成。想要了解气缸的工作原则，工作流程就要了解气缸的材料构成，下面就让我们一起去了解一气缸的结构和密封装置。
SMC双联气缸工作原理是：缸体固定时，其所带载荷（如工作台）与气缸两活塞杆连成一体，压缩空气依次进入气缸两腔（一腔进气另一腔排气），活塞杆带动工作台左右运动，工作台运动范围等于其有效行程s的3倍。安装所占空间大，一般用于小型设备上。
海口SMC办事处销售品种齐全、能满足众多领域不同用户的需求，在日本*已超过60%。产品被广泛的运用于汽车、电气、通信、食品、机床、建筑等领域。
SMC气动元件超过11000种基本系列，610000余种不同规格，主要包括气动洁净设备、电磁阀、各种气动压力、流量、方向控制阀、各种形式的气缸、摆缸、真空设备、气动仪表元件及设备，以及其他各种传感器与工业自动化元器件等。
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