辅助连杆式抽油机运动过程的计算机模拟

Computer simulation of motion of beam pumping unit with auxiliary link.

将常规游梁抽油机与辅助连杆综合构成一种辅助连杆式抽油机,在对抽油机做了受力分析和冲程计算后,推导出抽油杆增程系数和连杆驱动力增力系数计算式。在此基础上,采用I-DEAS软件对该机的各零件做了实体造型,并构造了机器的装配系统和运动机构,随后用计算机模拟系统的运动过程,得到系统中各主要运动件的运动曲线及抽油杆的各项运动参数曲线。模拟结果表明,这种抽油机运动更平稳,其冲程是常规游梁抽油机的4316倍,速度和加速度各减少约77%,且保留了机械换向和结构简单的优点。

An enlarged stroke beam pumping unit with auxiliary linkage and wheels is introduced in this article. After a force analysis and stroke calculation, equations for calculating the increment coefficient of the sucker rod stroke and the increment coefficient of the pitman driving force are derived. Full scale model for all components of the pumping unit is created by means of I-DEAS software, and an assembly system and motion mechanism are configured. The motion of the pumping unit system is simulated by computer, and the motion curves of main moving parts and curves of motion parameters of sucker rod are obtained. The result of the simulation shows that, the pumping unit with auxiliary link operates more smoothly with 77% reduction of the velocity and acceleration respectively, and its stroke is 4 316 times of the conventional pumping unit.