The piston is the pressured part in the pneumatic cylinder(body made by 6063-T5 aluminum tube). In order to prevent the blow-by gas of the two chambers of the piston, a piston seal ring is provided. The wear ring on the piston can improve the guidance of the cylinder, reduce the wear of the piston sealing ring, and reduce the friction resistance. Wear-resistant rings generally use polyurethane, polytetrafluoroethylene, cloth cloth synthetic resin and other materials. The width of the piston is determined by the size of the sealing ring and the length of the necessary sliding part. The sliding part is too short, which may cause early wear and seizure.
The internal and external leakage of the pneumatic cylinder is basically due to the eccentric installation of the piston rod, insufficient lubricant, wear or damage to the sealing ring and sealing ring, impurities in the cylinder and scratches on the piston rod. Therefore, when the internal and external leakage of the pneumatic cylinder occurs, the center of the piston rod should be readjusted to ensure the coaxiality of the piston rod and the cylinder; and the lubricator should be checked regularly to ensure that the pneumatic cylinder is well lubricated; if there is a cylinder Impurities should be removed in time; when there are scratches on the piston seals, they should be replaced with new ones. When the seal ring and seal ring are worn or damaged, they should be replaced in time.
Accurately speaking, it should be the lubrication between the piston ring and the cylinder wall, because the piston and the cylinder are in slight contact. 70% of the wear occurs in boundary friction and mixed friction, that is, friction during start-up. When the seal and the cylinder wall are partially filled with lubricant, mixed friction is formed. At this time, as the speed increases, the friction coefficient is still rapidly decreasing. When the piston speed reaches a certain value, an effective lubrication film is formed to achieve fluid lubrication. The lubrication method is splashing, but the excess oil must be scraped through the piston ring. In addition, when honing the cylinder, many fine pits will be formed on the surface of the cylinder liner to store oil, which is beneficial to lubrication.
For pneumatic components, to achieve long-life lubrication, it must meet the grease consistency and the viscosity of its base oil, which can achieve a low friction coefficient and a good auxiliary sealing effect; excellent adhesion and good compatibility with rubber And wetting performance; has good lubricating properties and reduce wear.
Post time: Dec-19-2022