直线与回转组合液压缸
Linear and rotary combined hydraulic cylinder
即同步化或个性化的旋转和直线升举运动 。当技术提高的时候，运动过程就会变得越来越自动化。
That is, synchronous or personalized rotation and linear lifting movement. As technology improves, the movement becomes more and more automatic.
液压缸是将液压能转变为机械能的、做直线往复运动（或摆动运动）的液压执行元件。它结构简单、工作可靠。用它来实现往复运动时，可免去减速装置，并且没有传动间隙，运动平稳，因此在各种机械的液压系统中得到广泛应用。液压缸输出力和活塞有效面积及其两边的压差成正比；液压缸基本上由缸筒和缸盖、活塞和活塞杆、密封装置、缓冲装置与排气装置组成。缓冲装置与排气装置视具体应用场合而定，其他装置则必不可少。
Hydraulic cylinder is a kind of hydraulic actuator which converts hydraulic energy into mechanical energy and makes linear reciprocating motion (or swing motion). It is simple in structure and reliable in operation. When it is used to realize reciprocating motion, it can avoid decelerating device, and has no transmission clearance, so it is widely used in various mechanical hydraulic systems. The output force of the hydraulic cylinder is directly proportional to the effective area of the piston and the pressure difference on both sides; the hydraulic cylinder is basically composed of cylinder barrel and cylinder head, piston and piston rod, sealing device, buffer device and exhaust device. Buffer and exhaust devices depend on the specific application, other devices are essential.