The invention relates to the technical field of oil extraction machinery, in particular to an automatic speed-changing wide-swing-angle oil pumping
machine. The automatic speed-changing wide-swing-angle oil pumping
machine comprises an
electric motor, a speed changing mechanism, a swing arm support, a swing arm arranged on the swing arm support, a support provided with a fixed
pulley and a
wellhead oil pumping device, wherein the speed changing mechanism is connected with a driving
crankshaft wheel, the driving
crankshaft wheel is meshed with a driven
crankshaft wheel, the driving crankshaft wheel is connected with a connecting piece through a bearing, one end of the connecting piece is connected with the driven crankshaft wheel, the other end of the connecting piece is connected with the swing arm through a connecting rod, a sliding chute is arranged on the connecting piece of which one end is connected with the driven crankshaft wheel, and a bearing on the driven crankshaft wheel is sleeved in the sliding chute. The automatic speed-changing wide-swing-angle oil pumping
machine disclosed by the invention has the advantages that when the two crankshaft wheels are in rotation, since the position of the bearing of a driven
pulley is changed, the position of the connecting piece can be also correspondingly changed, a motion trail of the connecting rod is affected by the motion of the connecting piece, the speed of the
wellhead oil pumping device in the up-
stroke is higher than that in the down-
stroke, the oil leakage problem existing in an oil pumping process is avoided, and the oil pumping efficiency is increased.