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Two horse heads pumping unit can change the regular pattern of pumping unit torque factor to strengthen balance effect and will realize energy saving aim. On the basis of conventional pumping unit .We revolute critical technique for its four bars structure, adopt special curved line beam latter arm, flexible connect beam with crossbeam in order that form special four bars structure of cranking bar(beam latter arm) length ?links length along with crank angle change, variable parameter. This forms a main structure of pumping unit which can apply practical new motor driving.When working, relying on regular change of beam latter arm achieves a working state when load is large, counter balance moment is also large and vice versa. Therefore balance effect of pumping unit is strengthened and also realizes energy saving aim.
