Abstract: A type of pumping unit with the auxiliary linkage and wheels is introduced in this paper for stroke increasing. In light of its mechanism,the analyses of working loasds and calculation of stroke are conducted,and the formulas are derived for calculating the factors of force increasing and stroke increasing. Then,the solid models of all components in the pumping unit system are created,and an assembly system is configured.Next the computer simulations of kinematics for it are conducted in I-DEAS environment,and some curves for describing kinetic characteristics of pumping unit are obtained. From this,the working loads are created by means of simulation method,and some curves for describing the loads exerted on main joints and driving torque exerted on crank are plotted. Finally,these curves are analyzed and the reasonable counterbalance ways and the mass of counterweight are determined.

Key words: pumping unit, computer simulation, dynamics, counterbalance

摘要： 介绍了长冲程抽油机系统计算机动特性模拟方法和过程。针对辅助连杆式抽油机进行了动力分析,导出增程和增力系数计算式。采用先进的CAD软件构造了该抽油机各个零部件的实体、装配系统和运动机构实体模型,进而模拟了抽油机系统的运动过程,得到各个主要部件的运动参数变化规律曲线。由此又模拟构造了工作载荷,得到系统中各个主要铰点的载荷和驱动力矩变化曲线。最后分析了各个曲线特性,确定合理平衡方式和平衡重质量。

关键词: 抽油机, 计算机模拟, 动力, 平衡