When a hydraulic cylinder seal fails, it will always leave incomprehensible clues, which will provide valuable insights into the root cause of the failure. Just like a detective checking a crime scene for clues, a hydraulic cylinder repair technician will look for evidence such as varnuse, rupture, rupture and expansion to pursue the culprit that caused your cylinder to fail to work. In this paper, what are the common reasons for the failure of hydraulic cylinder seal brought by Zhongyou heavy industry.
This information can be used to make the necessary changes to ensure that the failure does not occur again. So, with this in mind, let's look at the main types of hydraulic cylinder seal failures-and the causes of these failures. Therefore, the service life of the cylinder can be extended and unexpected maintenance downtime can be reduced.
1) Deterioration
Deterioration occurs when a cylinder seal loses all elasticity and begins to crack. It has the appearance of being cracked and broken. This typically occurs due to higher operating temperatures and prolonged exposure to sunlight and/or ozone.
2) Squeeze
Squeezing occurs when the inner (dynamic) face of the seal begins to push out and rupture. What happens is that the seal cannot cope with the internal pressure. Sometimes this is caused by excessive internal pressure, but it can also be caused by worn surfaces that exceed specifications. Therefore, when encountering extrusion, please disassemble the cylinder and measure all mating surfaces, bearing guide rings and measure to ensure that the tolerance is within an acceptable range.
3) Grooving
The slotting appears as a linear cut or groove worn to the dynamic seal side in the rod travel direction. This is usually caused by internal contamination-hard or sharp foreign objects have been found under the seal and worn into the special groove. In this case, the system must be flushed and the hydraulic oil replaced to prevent recurrence.
4) Fracturing
Fracking shows significant problems. Cracking of the seal material block will indicate this problem, the sealing surface may be burned off, and long cracks or cracks may appear. Reasons for this include excessive back pressure, increased friction, or poor hydraulic oil. A qualified hydraulic cylinder repair technician will be able to visually inspect the seal to tell you the conditions that caused the failure.
5) Hardening
When hardening occurs, the seal will appear glazed, cracked and brittle. The material loses elasticity and splits easily when pulled apart. This situation is usually caused by too high working temperature, and may be caused by the stroke speed higher than the recommended value and/or the poor quality of the hydraulic oil. In some cases, the sealing material may not be suitable for the application or type of hydraulic oil used.
6) Scar
Scarring refers to any form of cut, dent or scratch on the dynamic surface of the seal. Sometimes it is caused by improper installation of the seal (in this case, the seal almost always leaks immediately). More commonly, scarring is caused by damage to the cylinder rod caused by external impact or pollution, resulting in sharp wear on the rod surface. When the seal passes over these locations, the soft material is easily cut or damaged.
7) Swelling
In the event of expansion, the sealing material will deform and deform. This is usually the result of the incompatibility of the hydraulic oil with the sealing material. In some cases, exposure to water or external chemicals in the fluid may produce similar results. Ask your hydraulic service provider to recommend the correct seal type for your application and the fluids you use.
8) Excessive wear
Extreme wear can take on a glassy, mirror-like sheen on a dynamic ocean surface. It is usually caused by insufficient lubrication. In some cases, the wear of the seal may be inconsistent-excessive wear on one or both sides of the sealing surface. If this is the case, then you should suspect that excessive side load or cylinder misalignment has occurred.
[Introduction to Zhongyou Heavy Industry]]
Zhongyou Heavy Industry (Xingdi Machinery) is a forging equipment manufacturer focusing on fluid pressure forming technology. Since its establishment in 2007, Zhongyou Heavy Industry has been committed to the technological innovation and product development of internal high pressure forming. The main products range from the production of ordinary hydraulic equipment, now developed to the production, research and development of domestic top fluid pressure forming technology forging equipment.
Zhongyou Heavy Industry is a provider of advanced lightweight forming technology. From product research and development, equipment production, mold development, program customization, to final delivery and value-added services, we provide customers with not only a hydraulic equipment, but a Complete set of intelligent manufacturing and forming solutions.
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