Simulation Research of the Dynamic Characteristics of the Horse Head of Pumping Unit with Loose Connection Fault

The connection between the horse head and the walking beam of the beam pumping unit often becomes loose, which can cause serious consequences of cracks or breaks in the horse head. However, there is no research on the characteristics and diagnostic methods of loose horse head connections. In this paper, we established a three-dimensional simulation model of the Beam pumping unit and with impulses phenomenon as the core, studied their degree, time, direction and other characteristics when pins are loose. We found that the loose connection will cause the horse head to produce transient impulse at a specific working angle, and the impulse is affected by the degree of looseness. Some conclusions that can be used as reference basis for fault diagnosis are drawn.