活塞与连杆上端的连接，既可以是直接连接(筒状活塞式)，也可以是间接连接(十字头式)。
The piston may be connected to the upper end of the connecting rod either directly (trunk piston type), or indirectly (crosshead type).
下运动机构上端是一个气 缸活塞与一对长连杆的交接处相接；
The upper end of the upward-downward movement mechanism is provided with a cylinder piston connected with a jointing part of a pair of long connecting rods.
下运动机构上端是一个气 缸活塞与一对长连杆的交接处相接；
The upper end of the upward-downward movement mechanism is provided with a cylinder piston connected with a jointing part of a pair of long connecting rods.
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