In the actual production process, the hydraulic system of four column hydraulic press usually causes oil leakage due to poor sealing, bending of hydraulic cylinder, defects of engine cylinder block or cylinder head, excessive internal diameter of engine cylinder, hydraulic cylinder or cylinder, Morton and other factors. When oil leakage occurs, the working characteristics of the hydraulic system have a vicious change. It may cause insufficient crawling and driving force of the hydraulic system, which will seriously affect the stability, stability and service life of the facilities.

1、 Location and cause of oil leakage in hydraulic system of four column hydraulic press

Generally speaking, the leakage of hydraulic system is generally divided into internal leakage and external leakage. External leakage is very easy to detect and can be reasonably distinguished by careful observation. The internal leakage of the hydraulic system is difficult. On the one hand, the exact position of the internal leakage cannot be determined because it cannot be observed at the same time. On the other hand, it is impossible to accurately evaluate the function after maintenance.

1. Exposed position and reason of hydraulic system of four column hydraulic press

The external leakage of the hydraulic system can generally be divided into the following categories: the relative speed of the hydraulic system and the guiding module, and the oil leakage in the middle of the surface layer. Oil leakage along the middle of cylinder liner and dominant sleeve and outer sealing. There are defects on the hydraulic system body and mutual cooperation, resulting in oil leakage. The fixing of the joint part of the engine block and the bearing end cover cooperates with each other, and the oil leakage in the middle of the surface layer.

2、 Location and cause of air leakage in hydraulic system of four column hydraulic press

There are two key areas for the location of air leakage in the hydraulic system: the packing sealing position between the hydraulic cylinder and the piston rod. Only selecting the appropriate O-ring can avoid oil leakage. In addition, one is the sealing position between the piston rod and the cylinder arm.

Among them, the factors of air leakage in the hydraulic system are as follows: the hydraulic cylinder is deformed or the parallelism between the piston rod and the hydraulic cylinder is not very good. Damage or invalidity of hydraulic seals. The entry of iron pins or hard blocks. Problems related to design scheme, production, processing and assembly.