In the hydraulic system of the oil press, the effect of the seal is to avoid the leakage of the task medium and the intrusion of foreign matters such as dust and metal chips. The installation of the seal can be completed. The key component that plays the sealing effect is called the seal. The leakage of the system will reduce the volumetric efficiency of the hydraulic system, or fail to reach the required task pressure, or even make the hydraulic system unable to perform normal tasks. External leakage will also form the waste cost and pollution of the task medium. The invasion of foreign body will lead to the wear of hydraulic components, or make the hydraulic components infarction, stuck or even damaged, the formation of system sensitivity decreased.
Seals are divided into gap seals and non-gap seals. The former must ensure the inevitable common gap, while the latter applies the deformation of the seal to completely eliminate the gap between the two common surfaces so that the gap is controlled below the small gap through which the liquid to be sealed can pass. The small gap is installed in various ways in the hydraulic system determined by the pressure, viscosity, task temperature, relative movement speed of the common surface, etc, such as piston ring seal, mechanical seal, combination sealing gasket, metal sealing gasket, rubber gasket, rubber sealing ring and other common.
The primary requirements for seals in hydraulic press systems are:
1. In the inevitable pressure, temperature limitations with superior sealing function.
2. When there is relative activity, the friction force of the seal should be as small as possible, and the friction coefficient should be as constant as possible.
3. Corrosion resistance, good wear resistance, not easy to aging, long life of the task, can take the initiative to compensate for the inevitable level after wear.
4 simple structure, convenient assembly and disassembly, low cost.