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The role of hydraulic seals in the support hydraulic cylinder
Nov 15,2023
Hydraulic seals are highly sealable, that is, dynamic and static sealing applications, in the absence of pressure, vibration, bending, material deformation and other extreme cases, no leakage or small leakage, small wear, corrosion resistance, small friction. The safety of the work is determined by the material characteristics of the seal, the shape and the stability of the position. The hydraulic seals must prevent the intrusion of external dust, water, coal powder, etc., and at the same time, sufficient oil film must be maintained on the piston rod (live column) to ensure the normal operation of the hydraulic cylinder.
Due to the damage of the seal or the weakening of its efficiency, the reliability and life of the seal largely depend on the surface quality of the sealing element (roughness, hardness, etc.), which is also an important factor in the failure of the reciprocating seal. About 80% of the hydraulic cylinder seal failure is caused by the poor working condition of the emulsion, mainly for the oil particle pollution. The commonly used medium for the support hydraulic system is oil-in-water emulsion, water accounts for 85% to 98%, low viscosity, lubrication, rust resistance, wear resistance are very poor, and it is particularly sensitive to particle wear.
When the hydraulic cylinder is assembled, the abrasive, molding sand, rust, welding slag and other coarse and hard particles falling from the honing strip in the cylinder are the most deadly to the hydraulic cylinder sealing system. Invading dust, pulverized coal and contaminants brought into the emulsion during use. Such as parts of the wear and tear, rust, peeling coating. When the emulsion with particle pollution flows through a narrow gap at high speed, the particles hit the surface of the seal, support and other components at high speed to form corrosion wear. Erosion pitting is the main result of corrosion wear.
When there is not enough lubrication between the seal and the mating surface, the rough and uneven surface structure due to poor processing will make the particles cut through the surface of the metal or the chrome layer. Dust and dirt, floating rust, pollution particles accumulate together, causing a hard matching surface, that is, the chromium plating layer of the piston rod (live column), grinding and wear on the inner surface of the cylinder, and even strain, resulting in increased leakage, insufficient thrust or unstable action, crawling, speed decline, sound and vibration and other faults.
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