RESEARCH ON THE KINETIC AND DYNAMIC CHARACTERISTICS OF ADJUSTABLE DIAMETER AND CHANGEABLE MOMENT PUMPING UNIT

The adjustable diameter and changeable toque pumping unit is a new type of pumping unit with unusual balance equipment which is improved on the basis of front mounted beam pumping unit.The unit cancels the crank balance weight and converts the conventional walking beam into three section bent one.This paper deduces the formulas of the velocity and acceleration of polish rod and the toque on the crank according to the structural and motional characteristics of pumping unit.The relative parameters of pumping unit model CYJ8-3-26HY were contrasted with them of conventional unit model CYJ8-3-48B.Then the kinetic and dynamic characteristics were analyzed.