The technology of hydraulic pumping units is developing very fast because of the remarkable energy-saving effect. In this study,a set of system of hydraulic pumping unit is designed innovatively for saving energy and reducing energy consumption. At the aspect of the mechanical structure,the weight of the sucker rod is balanced completely by means of a counterweight,which makes the descending potential energy of the sucker rod stored up in the counterweight and reused for pumping oil next time. This reduces ...
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