Study on the relationship between the friction pairs wear and the plunger fracture

The plunger pump is one of the most complicated hydraulic components, the fault reason is hidden, the traditional analysis method such as theoretical formula is difficult to study its fault principle and correlation. In some cases of plunger pump failure, the fracture of the plunger is usually accompanied by serious wear of plunger and sliding shoe. In order to study the correlation between kinematic pairs wear and plunger fracture, a flexible-solid coupling dynamic digital prototype of plunger pump is built, which takes into account the action of hydraulic pressure and rotating load in a rotating cycle. The friction force of the friction pair is considered by modifying the contact method of the friction surface of kinematic pair. The simulation results show that the plunger pair wear leads to the increase of supporting force of sliding shoes, the wear of plunger and sliding shoe leads to the sharp increase of stress of plunger neck, the wear of kinematic pair is related to the plunger fracture.