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近几年来,苏联已广泛采用型机械式无游梁抽油机来驱动有杆抽油泵。但是,实践表明,在使用这种抽油机的过程中,其支架前腿的上活接头部件常常发生断裂事故,而以上活接头至支架后腿横梁的焊缝处的断裂尤为突出。对断裂上活接头进行失效分析的结果表明,颊板上安插活接头的销轴孔由于受到磨损而成椭圆形,椭圆长轴与前腿轴线平行,说明载荷沿着椭圆长轴作用于活接头上。由此可以推
In recent years, the Soviet Union has widely adopted type mechanical beamless pumping unit to drive rod pump. However, practice shows that in the process of using this kind of pumping unit, the upper joint part of the front leg of the bracket often has a fracture accident, and the fracture of the joint between the upper joint and the back beam of the bracket is particularly prominent. The results of failure analysis of the live joints on the fracture show that the pin holes of the live joints on the cheek plate are oval due to being worn and the long axis of the ellipse is parallel to the axis of the front legs and the load acts on the live joints along the long axis of the ellipse on. This can be pushed