What is an engineering machinery excavator? It is an excavating machinery and an excavator seal. It is used for excavating materials above or below the surface of the bucket and loading it into the earth moving machinery of the transport vehicle or unloading to the stockyard. Materials excavated by the excavator are mainly soil, coal, silt and pre-slung soil and rock. The excavator seals commonly used in our work include buffer ring (HBY, HBTS), anti-fouling. Sealing ring (KZT), shaft seal, heavy duty shaft seal, hole combination seal and dust seal. These are the common types of excavator sealing components.
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The following is a detailed description of common faults in mechanical equipment for seals and how to improve or eliminate them. When the oil leak is found, first check the seal area for any abnormalities.
When seals have no abnormality
When there’s oil leakage at low pressure and no oil leakage at high pressure, the reason is that the surface roughness of the assembly is poor, and the surface roughness should be improved to 3.2~6.3umry with a lower hardness. The oil ring of the piston rod becomes loose, and each time a few drops oil will leak. The reason is that the lip of the dust ring scrapes off the oil film and needs to be replaced with a dust seal. When the oil leaks at high temperature at low temperature, there are two reasons for this. One is that the eccentricity is too large, and the other is that the sealing ring material is improperly selected. This phenomenon can be solved by rotating the cold-resistant excavator seal ring. YBAS always adhere to high standard to provide high-quality seals.
When seals have abnormal conditions
When the main oil seal is hardened on the surface, and the sliding surface is cracked: the reason is that the high-speed running pressure is too high; when the surface of the main oil seal is hardened, and the oil seal of the entire seal is broken, the reason is that the oil temperature of the hydraulic oil is abnormally increased, and the ozone damaged the seal. When the lip seal of the oil seal seal is broken; the reason is that the assembly chamfer is improper, and the installation and storage methods are incorrect. When there are damage and worn marks on the sliding surface of the oil seal due to the rough mating surface, that’s because of improper selection of the piston rod and impurities.
So what are the conditions for excavator pressure relief? How to solve the problems?
1. Manufacturing and assembly factors: All hydraulic components and sealing components of excavators have strict dimensional tolerances, surface treatment, surface finish and shape tolerances. If the manufacturing process is out of tolerance, such as: the piston radius of the cylinder, the depth or width of the seal groove, the hole size of the seal is too poor, or the circle is lost due to processing problems, the part itself has a congenital leakage point. Leakage occurs after assembly or during use.
2.Assembly factors: hydraulic components in the assembly should avoid the barbaric operation,excessive force will make the parts deform, especially with copper rods, the cylinder block, sealing flange, etc.; parts should be carefully inspected before assembly, a little hydraulic oil should be added on the part and gently press it in. Diesel oil should be used especially for rubber parts such as seals, dust seals and O-rings. If you use gasoline, it will be easy to age and lose its original elasticity, thus losing the sealing function.
3. Oil pollution and damage to the excavator parts, can be subdivided into gas pollution, particulate pollution, water pollution and accessories damage may also cause pressure relief.
4. Design factors: The reliability of the excavator hydraulic system depends to a large extent on the design of the hydraulic system seal and the selection of the seal. Due to the unreasonable selection of the seal structure in the design, the selection of the seal will not be in accordance with the specifications. The compatibility type of the hydraulic oil and the sealing material, the load condition, the ultimate pressure, the working speed, and the change of the ambient temperature are not considered.
These all directly or indirectly cause hydraulic system leakage to varying degrees. In addition, due to the dust and impurities in the working environment of the excavator seal, it is necessary to select a suitable dust seal in the design to prevent dust and other contaminants from entering the system to damage the seal and contaminate the oil, thereby causing leakage.
For more professional guidance on seal kits, warm welcome to contact YBAS SEALS.