Research On The Key Technologies About Reversing System Of Chain-driven Pumping Units

Chain-driven pumping units-- a long-stroke energy-pumping, its advantages of long stroke and low-frequency stroke can exert effectively at oil field, especially those high water cut oil field. However, from the current development situation of chain-driven pumping units,its core structure-- reversing system have higher trouble rates. Therefore, we need further research on the theoretical and structural improvements of chain-driven pumping units. The main contents of this paper includes the following aspects:(1)The authors found the major failure reason of reversing system by force analysis for traditional chain-driven pumping units,and suggest use a symmetric double-chain synchronous operation mechanism instead of the traditional one-sided chain commutation mechanism;Building the new kinematics equation and load equation about polished rod based on polygon effect,it can provide reliable theoretical basis for the manufacturing of the new chain-driven pumping units.(2)Studying the effects of stroke, stroke rate, preload and polygon effect for the motion performance, and conducting a multi-body dynamics simulation analysis by building 3D simplified model used of Pro/E and ADAMS.(3)The prototype of the main body was preliminary completed with the help of our school leadership, teachers and classmates and the test was carried indoors. But,because of a lack of paraments of concrete, only acceleration, output torque of reducer and frame stress was tested.The results show that the new chain-driven pumping units can realize the function of reverse,the established kinematic equations can explain the motion law of suspension point.At working,it would not produce exaggerated noises and mechanical vibration when choice the reasonable pumping speed.The research about chain-driven pumping units had a long history and the energy saving technology was not enough in our country. It had the certain difficulty to apply the technology to the actual, but, the research methods and results had a certain reference value for the further update of chain-driven pumping units.