Abstract
Horse head is an important part of Beam pumping unit. Loose connection between the horse head and the walking beam is a common fault, which can cause serious consequences of the horse head cracking or falling off. However, there is currently no research on the characteristics and diagnosis methods of the loose connection of the horse head. We built a proportional test bench of pumping unit to study the dynamic characteristics of the horse head loosening fault. We found that the loose connection may cause the horse head to produce transient vibration at a specific operating angle. And we studied the characteristics of the time, direction and strength of the impulse when the pin is loose. These conclusions provide a certain reference basis for the diagnosis of the fault.
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