Analysis of Several Causes of Serious Damage to the Piston Rod

1. Because there are relatively hard objects in the cylinder, because the bolts of the air valve, the limiter of the lift and the plug of the piston fall into the cylinder, resulting in a serious pull of the piston rod in the gap at the dead point during operation. break phenomenon;
2. There is a large amount of liquid in the gas of the process, which eventually causes liquid accumulation between the piston rod and the cylinder, and also causes the dead center gap of the piston rod to be directly broken;
3. The concentricity between the cylinder and the middle body does not meet the standard requirements during installation, resulting in a gap between the centerline of the cylinder and the centerline of the middle body, and the piston rod and crosshead will bend when they are running. stress phenomenon, leading to severe fatigue and damage.
4. The pre-tightening force of the nut of the piston rod is too large, resulting in serious yield and deformation of the piston rod, and the number of times the piston rod is subjected to alternating gas will increase accordingly, eventually causing damage to the piston rod.
5. When the thread of the piston rod is being turned, the bottom angle of the thread is too small, and a larger fillet should be used, resulting in the phenomenon of straight angles, and eventually greater stress and damage.
6. Because the pre-tightening force between the piston rod and the nut is too small, the piston will be affected by the gas force, causing the piston rod to rotate, and the nut of the piston rod will become loose.