Quelles sont les propriétés des matériaux d'étanchéité

Maintenant, la plupart des matériaux d'étanchéité des kits de joints de pelle utilisés dans le pays et à l'étranger sont des élastomères polymères, et certaines conditions particulières imposent également l'utilisation de plastiques et de divers types de métaux. Mais quel que soit le type de matériau auquel il appartient, 14521940 center joint seal kits Volvo EW140B EW160B excavator should have the following properties:

1.Avoir certaines propriétés mécaniques et physiques: comme la résistance à la traction, force d'allongement fixe, élongation;
2. Un certain degré d'élasticité, dureté appropriée, and compression permanent deformation is small;
3. Adapt to the working medium, not easy to produce swelling, decomposition, hardening;
4. Wear resistance, has a certain tear resistance;
5. It has high temperature and low temperature aging resistance.

Cependant, there is no 1052601 seal kits excavator hydraulic cylinder sealing material including all the above performance, need to choose the appropriate sealing material according to the working environment, such as temperature, pression, medium and movement mode, and through the formulation of materials to meet certain requirements. Or use more than two kinds of material composite or combination structure form to play their respective strengths, to achieve a more comprehensive effect.

The formation of digger seal kits sealing effect: dynamic sealing is divided into non-contact sealing and contact sealing. Non-contact 14515051 seal kits Volvo EC210B EC210C L EC210C LR excavator boom cylinder is mainly a variety of mechanical seals, such as: graphite packing ring, floating ring seal; Both rubber and plastic composite seals and rubber and plastic combination seals belong to contact seals, which rely on the pre-compression force packed in the sealing chamber to block the leakage channel and obtain the sealing effect. The seals used in hydraulic system are static seal (face seal), reciprocating dynamic seal (piston, piston rod seal) and rotary seal.

Factors affecting the digger seal kits sealing effect: the selection of sealing structure and oil film formation, pression, temperature, material compatibility, the material, hardness, geometric shape and surface finish of the working surface contacted by the dynamic seal.