CBD.SEALS

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Construction & Mining Equipment

  • CBD.SEALS
  • Construction & Mining Equipment

    • Seals in the earthmoving construction and mining equipment sectors are key components in ensuring the efficient and reliable operation of heavy machinery in harsh working environments. These include excavators, loaders, bulldozers, mining trucks, drilling rigs and more, which operate in dusty environments with extreme temperatures and pressures ！

    Types of seals

    Static seals: used for sealing between fixed parts, such as hydraulic cylinder cover, engine cover, etc.

    Dynamic seals: used for sealing between relatively moving parts, such as pistons and cylinders, shafts and bearings.

    Rotary seals: specially used for sealing rotating shafts, such as drive shaft oil seals, hub oil seals and so on.

    Material selection

    Rubber seals: such as nitrile rubber (NBR), fluorine rubber (FKM), polyurethane (PU), etc., with good elasticity and oil resistance.

    Metal seals: such as stainless steel, copper, aluminum, etc., suitable for high temperature and high pressure environment.

    Composite seals: combining the advantages of metal and rubber, such as metal-coated rubber, filled polytetrafluoroethylene (PTFE), etc.

    Design requirements

    Abrasion resistance: In dusty and gritty environments, seals need to have good abrasion resistance.

    Temperature resistance: the ability to maintain performance in extreme temperatures, from cold winters to hot summers.

    Pressure resistance: the ability to maintain seals in high-pressure environments, such as hydraulic systems.

    Chemical resistance: able to resist corrosion from chemicals such as fuels, lubricants, hydraulic fluids, etc.

    Impact resistance: seals need to maintain their integrity under the vibration and shock of heavy machinery.

    Reliability: During the design life, the seal must maintain its function without leakage.

    Manufacturing process

    Molding: Suitable for the manufacture of rubber and some composite seals.

    Machining: For the manufacture of metal seals.

    Injection molding: applicable to the manufacture of certain plastic seals.

    Testing and verification

    Leakage testing: Leakage testing through media such as water or oil to ensure that the seals are leak-free.

    Environmental testing: Seal performance is tested in simulated earth construction and mining operation environments, such as mud, sand, dust, high temperature, etc.

    Lifetime testing: Evaluate the service life of seals through accelerated aging tests.

    Application examples

    Excavator hydraulic system seals: Ensure the hydraulic system works properly under high pressure without leakage.

    Loader driveshaft seal: protects the driveshaft from soil and moisture erosion, ensuring transmission efficiency.

    Mining truck tire seals: prevent gas leakage inside tires and keep tire pressure stable.

    Drilling rig rotary joint sealing: prevent mud and rock particles from entering the rotary joint during drilling.