There are two main types of leakage in the hydraulic system of a hydraulic press: leakage in the fixed seal and leakage in the moving seal. The leakage in the fixed seal mainly includes the cylinder bottom, valve assembly connection surface, and oil pipe joints; the leakage in the motion seal mainly includes the cylinder piston rod. Parts, multi-way valve stem and other parts. From the form of oil leakage, it can also be divided into external leakage and internal leakage. External leakage mainly refers to the leakage of hydraulic oil from the system to the environment. Internal leakage refers to the existence of the pressure difference between the high and low pressure sides and the failure of the seal. , So that the hydraulic oil flows from the high pressure side to the low pressure side in the system.
Three reasons why hydraulic presses affect leakage
Hydraulic press planning factors
1. Selection of seals for hydraulic press equipment
The reliability of the hydraulic system depends to a large extent on the planning of the hydraulic system seal and the selection of seals, because the selection of the seal structure in the planning is unreasonable, and the selection of the seals does not conform to the specifications. The planning does not take into account the hydraulic oil and The compatibility of sealing materials, load conditions, ultimate pressure, working speed, changes in ambient temperature, etc. These all directly or indirectly cause leakage of the hydraulic system to varying degrees. In addition, because there are dust and impurities in the use environment of construction machinery, suitable dust-proof seals should be selected in the planning to prevent dust and other dirt from entering the system to damage the seal and contaminate the oil, and then cause leakage.
2. Other planning reasons
In the planning, it is considered that the geometric accuracy and roughness of the moving surface is not comprehensive, and the strength of the connection part is not checked in the planning, which will cause leakage in the work of the machine.
