Automatic differential starter of beam -pumping unit

The utility model belongs to a mechanical equipment, concretely relates to oil field automatic differential starter of beam -pumping unit for solve the problem that current planet transmission starting drive structure is complicated, manufacturing cost is high, the fault rate is high, operating maintenance is inconvenient. Its structure mainly includes box, input shaft, output shaft, transmission shaft, action bars, belt pulley, speed regulation gear, movable gear dish, solenoid valve, relay. Big, pinion be equipped with on the transmission shaft for slow down during the start -up and increase torque output. Speed regulation gear and movable gear dish be equipped with on the output shaft. The relay is used for control solenoid and motor to start, and solenoid valve drive action bars is stirred the movable gear dish and is moved left or right, realizes that low -speed starts to together fast moving conversion. This starter simple structure, with low costs, the operation is reliable, and it is convenient to mai