In the hydraulic system and hydraulic components of the fully automatic concrete mixer, due to processing error, assembly error and relative movement between mating surfaces, there will always be some gaps. When the oil flows through these gaps, there will be oil leakage, which is called oil leakage. The leakage of the sealing device mainly includes the internal leakage of the sealing ring and the external leakage of the skeleton rotating oil seal. The reasons are as follows:
(1) Cause of internal leakage of sealing ring
A There is relative movement between the sealing ring and the surface of the sealed part, causing abnormal wear.
B Poor contact of sealing ring.
C The seal ring is worn unevenly.
D The seal ring is of poor quality, causing deformation or fracture.
(2) Causes of external leakage of framework rotating oil seal
A The radial runout of the sealed parts exceeds the allowable value, which causes uneven wear of the skeleton rotating oil seal.
B The quality of the seal is poor, and the lip of the oil seal is deformed under high temperature, resulting in the strain on the cylindrical surface of the seal.
Internal leakage refers to the leakage of internal oil in hydraulic components of hydraulic system from high pressure area to low pressure area; External leakage refers to the leakage of the oil in the hydraulic system to the outside of the hydraulic system, such as the leakage of the hydraulic cylinder and the leakage of the oil pipeline.
The leakage in the hydraulic system is caused by the pressure difference at both ends of the gap or the relative movement of the two mating surfaces that make up the gap. Leakage will reduce the efficiency of the hydraulic system and pollute the environment.
Measures to reduce and prevent internal leakage: strictly control the fitting clearance between the relative moving parts in the hydraulic components, and the principle is to ensure good sealing and small movement resistance
Measures to reduce and prevent external leakage: improve the sealing of the piston rod of the hydraulic cylinder, correctly install various pipes and other connectors during assembly, pay attention to the sealing of the mating surface of hydraulic components, especially the joints of various hydraulic components.
The reason for the leakage of the sealing device in the hydraulic system of the mixing truck is explained clearly here. I hope it can help you. Please come to our website for more details Consult!