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双变径摆轮抽油机是一种摆轮采用变径技术的无游梁式抽油机。进行运动学计算时，由于大小两个摆轮采用变径技术，而且相位不同，悬点位移、速度、加速度与曲柄转角之间的关系很难用数学式直接表达出来。针对这一问题，给出了双变径摆轮抽油机运动学计算的一种简单有效的方法：假设柔性件的长度不变，利用数值计算的方法进行求解。第一步，求出小摆轮转角与曲柄转角之间的数值对应关系；第二步，求出悬点位移与大摆轮转角之间的数值对应关系。由于大小两摆轮为同一个构件，悬点位移与曲柄转角之间的数值对应关系可由以上两步联立求出，进而利用差分法可求出悬点速度和加速度与曲柄转角的关系。
Double variable diameter balance wheel pumping unit is a balance wheel using the variable beam technology without pumping unit. In kinematics calculation, the relationship between the displacement, the speed, the acceleration and the crank angle is hard to express directly by the mathematical formula because the two balance wheels adopt the variable-diameter technology and the phases are different. Aiming at this problem, a simple and effective method for kinematics calculation of double-variable-diameter balance-wheel pumping unit is given: Suppose the length of the flexible member is constant and solved by numerical calculation. The first step, find the value of the relationship between the small wheel angle and the crank angle; the second step, find the value of the relationship between the displacement of the suspension point and the large swing angle. As the size of the two balance wheel for the same component, the relationship between the displacement and the crank angle can be obtained by the above two-step simultaneous determination, and then use the difference method can be obtained from the suspension speed and acceleration and crank angle relationship.