Reciprocating piston pump crankshaft by connecting rods connected with the original motivation. Prime mover can be motor, steam engine can also be used.
往复泵的活塞由连杆曲轴与原动机相连。原动机可用电机，亦可用蒸汽机。
2
The feasibility and necessity of economic reasonable operation of symmetrical reciprocating double motor drive lifter are expounded, and analyzed with actual example.
阐述了对称往复式双机拖动提升机经济合理运行的可行性和必要性，并进行了实例分析。
3
This system could precisely machine elliptic parts with high speed by the micro-reciprocating feed motion of linear motor and the high speed performance of electrical spindle.