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     The pumping unit can be divided into two types: beam type and no beam type. At present, the most widely used type of pumping unit is the beam pumping unit. The jaw pumping unit is mainly composed of a beam-linkage-crank (four-bar linkage) mechanism, a speed reduction mechanism (reducer), a power equipment (motor) and an auxiliary device. When the cruise pumping unit is working, the motor (or other power machine) transmits the high-speed rotary motion to the input shaft of the reducer through the drive belt. After deceleration, the crank that rotates at a low speed drives the beam to swing up and down through the four-bar linkage mechanism. . The arc-shaped hoe at the front end of the beam leads the rod of the sucker rod to move up and down linearly.

     According to different structural forms, the beam pumping unit is divided into a conventional type (common type), a heterogeneous type and a front type. The conventional and front models are two basic types of beam pumping units.

     Conventional type (ordinary type)

     Heterogeneous

     Front type