t torque from the reduction gearbox.РTable 2. Simulation results of the two kinds of balance designs for the double horse-head pumping unit.РFigure 6. Stress testing system of pumping unit.РFigure 7. Stress test points on the horse head and beam: (a) test points at pin A; (b) test points at pin B; (c) test points on beamРFigure 8. Stress test points on the steel support: (a) test points at the bottom of steel support; (b) test points on the upper side of steel support.РStress testР Stress test is an efficient way to find whether the pumping unit is a reasonable design.16 The stress test pleted for the double horse-head pumping unit based on the No. pound balance design in Table 2. The stress testing system of pound balance pumping unit is built in Figure 6. The main electric apparatuses of
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