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Several necessary conditions to avoid hydraulic cylinder failure
Apr 29,2021
When using appliances or machinery, instructions usually advise users to read the precautions before use, which are necessary but not sufficient conditions to avoid malfunctions. In other words, proper care must be taken to prevent accidental damage during use. Let's discuss several necessary but not sufficient conditions for avoiding malfunctions in hydraulic cylinders. A brief summary is as follows:
1. The hardness of the hydraulic cylinder sealing ring should be between 92 and 97 degrees. The higher the hydraulic cylinder pressure, the higher the hardness of the seal should be.
2. The lip speed of the sealing ring must meet 0.5 meters/second.
3. The sealing ring must withstand temperatures between -30℃ and 110℃. Because the temperature of the contact surface of the sealing ring lip is higher than the hydraulic oil temperature, the selected seal must withstand high temperatures of 110℃; while the temperature in some areas is around -30℃, so the seal must also withstand low temperatures of -30℃.
4. Specialized seals must be selected. For example, shaft seals can only use shaft-specific seals. Piston seals can only use piston-specific seals and not dual-purpose seals for both shafts and pistons. This is because the bottom width of dual-purpose seals is smaller than that of specialized seals. Under high pressure, dual-purpose seals deform significantly at the bottom, while specialized seals have a wider bottom under the same pressure, resulting in less compression deformation and a lower probability of being squeezed out by the piston rod. A gasket should be added to the bottom of the hydraulic cylinder seal. Why add a gasket, and what is its hardness? Because the hydraulic cylinder pressure is above 25 MPa, the height of the seal determines the amount of bottom deformation, that is, the size of the extrusion gap. Since the gasket also has hardness and deformation, adding a gasket reduces the deformation of the seal. In high-pressure hydraulic cylinders, this reduces the possibility of friction between the bottom of the seal and the piston rod or the inner wall of the hydraulic cylinder, thus reducing the chance of the seal root being squeezed out, scratched, and damaged. The relationship between gasket hardness and pressure is that the higher the pressure, the higher the hardness.
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