Piston rods are the most widely used in the hydraulic machinery industry, and have recently been investigated in the market (shì chǎng) because of the external The number of incidents of leakage and retreat is increasing. After checking the returned piston rods, it is found that the seals have different degrees of aging and wear (a basic type of component failure) and other factors (Condition). (factor) will cause (cause) such a situation to appear?

     
1. Serious bumps on the surface of the piston rod:
      The piston rod is used in hydraulic equipment. During the lifting process, the bucket will move continuously, which will cause the material in the bucket to slip and directly Falling on the surface of the piston rod, the surface of the piston is pulled out of tiny pits, and the friction between the seal ring and the piston rod is increased. At this time, the seal ring is sure to be worn (a type of component failure) The basic type is severe and invalid. When the hollow piston rods have the same material and the cross-sectional area is equal, the hollow piston rod has stronger torsion resistance and can withstand large external moments.
    
2. The piston rod and the guide sleeve fail in the gap:
     In fact, the piston rod and the guide sleeve have been clearly defined at the beginning of the design (guī dì ng), but in the actual use process, if there is a public office before the two, Moreover, because the machine will be overloaded for a long time, the high temperature will cause it to expand, and finally the effect of the piston rod and the sealing ring will be affected. The 45# piston rod connects the piston and the crosshead to transmit the force acting on the piston and drive the piston to move. The piston rod of the cylinder has a piston rod at one end, and the air supply from the side of the piston generates air pressure, and the air pressure pushes the piston to generate a thrust and returns by the spring or the self weight. The hydraulic piston rod cylinder, the piston rod (cylinder rod), the piston and the end cover are composed of several parts.
    
3. The quenching phenomenon of the intermediate frequency occurs on the surface of the piston rod:
     The use of intermediate frequency quenching can increase the hardness of the piston rod, not only improve its anti-collision ability on the surface, but also effectively reduce the roughness of the entire surface of the piston rod (cū cāo) And because it is deeper in depth, it is also improved in the strength of bending resistance.
    
Fourth, a reasonable selection of piston (piston) rod equipment (shè bè i):
     Under the condition of ensuring the safety clearance of the piston rod, we should maximize the use of the thickness of the oil film to control the use of the sustain ring to ensure sufficient lubrication of the sealing lip and prevent friction. The occurrence of abnormal flow causes an effective change between the sealing lip and the size and shape, and guarantees the failure of the sealing performance (the thing that serves as a guarantee). The piston rod of the cylinder has a piston rod at one end, and the air supply from the side of the piston generates air pressure, and the air pressure pushes the piston to generate a thrust and returns by the spring or the self weight.

• prev：What material is better for piston rod processing?
• next：What should be paid attention to when installing the seal on