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The function of the piston rod is to connect the piston and the crosshead, transfer the force acting on the piston and drive the piston motion.

Basic requirements for piston rod:

(1) to have enough strength, stiffness and stability;

(2) Good wear resistance and high machining accuracy and surface roughness requirements;

(3) Minimize the influence of stress concentration on the structure;

(4) ensure that the connection is reliable and prevent loosening;

(5) piston rod structure design to facilitate the disassembly of the piston.