The choice of hydraulic seals is the key to the design of hydraulic cylinders. Hydraulic seals used improperly, resulting in leakage of hydraulic cylinders, affecting the performance of hydraulic cylinders, less than the design of the work pressure, speed and stability of the work, resulting in the system can not work properly. Therefore, the design of hydraulic cylinders, hydraulic cylinders must be based on the working pressure, environment, temperature, medium, conditions, travel and other factors, choose the appropriate seal. Commonly used self-sealing compression hydraulic seal is mainly o-ring, circular ring and square ring, etc., they have a simple structure, easy to manufacture, low cost, etc., so they are widely used in hydraulic drive system A dynamic sealing member and a static sealing member. They are installed in the seal groove usually produces 10-25% of the radial compression deformation, and the sealing surface to produce a high initial contact stress, thereby preventing the leakage of non-pressure liquid.

After forming the final product to deal with flash, the hydraulic seal surface smooth products without burr. Structural composition Linear structure: Unvulcanized rubber of the general structure. As a large molecular weight, no external force, was fine dough. When the external force, the removal of external forces, sub-groups of the entanglement degree of change, the molecular chain rebound, resulting in a strong tendency to restore, this is the origin of the high elasticity of rubber. Branched structure: rubber macromolecular chain branching aggregation, the formation of gel. Gel performance and processing of rubber are detrimental. In the rubber, all kinds of complex agents often improve the gel area, the formation of local blank, can not form reinforcement and cross-linking, as the weak parts of the product.