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The use of hydraulic cylinder in hydraulic elevator, the part usually has five parts: piston and piston rod, cylinder and cylinder head, buffer device, sealing device and exhaust device.
液压升降机中使用的液压油缸，其组成部分通常有五部分：活塞和活塞杆、缸筒和缸盖、缓冲装置、密封装置、排气装置。
As the piston descended, a ratchet engaged the piston rod and engine shaft and thus power was transmitted.
当活塞下行时，棘轮连接活塞杆和发动机轴，因此将功率输送出去。
Replace piston rod and add flow passage on piston rod.
更换活塞杆，在活塞杆上增设流道。
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