The Structure Analysis And Optimization Design Of Four-bar Linkage Pumping Unit

Oil is an international strategic resources, with the rapid development of industry, for its demand is rising year by year. The requirement of oil in every country is enhancing year by year with the rapid development of petroleum industry.According to China’s oil economy technology research institute’s prediction, that in 2015, the requirement of oil in China is about 533.67 million tons. More than 70% of the crude oil extraction is accomplished by pumping unit. Rod pumping unit accounted for more than 90% of the total number of pumping unit. Since the energy consumption of rod production system is becoming more and more serious causes the efficiency reduced, further leads to the increased cost of oil extraction. Rod production system mainly consists of three parts: above the ground equipment, pumping unit and its subsidiary system, the sucker rod string, pump, in these three parts, pumping unit has an important significance and is the important part of energy consumption.At present, the most widely used of the pumping unit in the world is the conventional beam pumping unit, the machine is stable, but the efficiency is not high. In the context of the above, lots of research on energy-saving pumping unit promptly went to work. This paper is based on the invention designs. A new type of energy-saving pumping unit-- parallel four-bar pumping unit(patent number: ZL200820191342.6) to launch study and discussion.Based on the early research that our group has finished, this paper has accomplished the dynamics analysis, the structure analysis and optimization design of 14 type four-bar linkage pumping unit. By using the ADAMS software, analyzed the drive torque of the two kinds of design scheme. determined the installation position of the four-bar linkage pumping unit and the rotation direction of the crank. The paper also analyzed the movement characteristics of the suspension point at the same time. Using SolidWorks software to establish three-dimensional model, combining the finite element analysis software COSMOSWorks to analysis four kinds of potentially dangerous work conditions for assembly finite element analysis. When the suspension point in the highest position was found to be the real dangerous work condition. Only the former long bar did not meet the requirements of strength. Further optimization design was carried out on the former long bar. Combining with the analysis of COSMOSWorks, determine the replacement of materials and increase the thickness is the optimization. For the former short rod, rear short rod and connecting rod these two-force bars,the flexure analysis shows that only linkage does not meet the factor of safety regulation. By the optimization design, it meet the requirements.In this paper, the main work is done through the CAD software to establish the virtual prototype, thus virtual prototype technology has played an important role in guiding practical engineering design.