ingiant technology | Industry new | Feb 27.2025
As a key component for transmitting power and signals in industrial equipment, the selection of cable drum slip rings directly affects the long-term stability and safety of the equipment. However, in actual procurement, many engineers or purchasers often fall into selection misunderstandings due to insufficient understanding of technical parameters, resulting in frequent equipment failures and even safety hazards. This article will sort out several common misunderstandings to help you accurately match your needs, especially the core points involving IP68 protection slip rings and explosion-proof slip ring current capacity.
Misconception 1: Ignore the environmental protection level and blindly choose a general model
Many users believe that "the higher the protection level of the slip ring, the more wasteful the cost", so they tend to choose a low-protection model in non-extreme environments. However, this view ignores the complexity of industrial scenarios. For example, in an open-air port or dusty workshop, if the IP68 protection slip ring is not used, water vapor or particulate matter may penetrate into the slip ring, causing oxidation of the contact point and signal interruption.Recommendation: Strictly match the protection level according to the equipment deployment environment. For example, the IP68 standard must be selected in humid and dusty areas, while IP65 can be selected in ordinary workshops.
Misconception 2: The current capacity of explosion-proof slip rings only refers to static parameters
In explosion-proof scenarios (such as chemical industry and mining), users often directly select the model based on the nominal current capacity of explosion-proof slip rings, but ignore the impact of dynamic working conditions. For example, the current peak at the moment of equipment start and stop may far exceed the rated value, and long-term overload will accelerate the wear of the slip ring and even cause safety hazards.
Case description: A mining group once selected slip rings with a current capacity that "just met the standard", which caused frequent equipment tripping. After testing, it was found that the instantaneous current in actual operation reached 1.5 times the nominal value, and the problem was finally solved by replacing a higher capacity model.
Misconception 3: Confusing explosion-proof grade standards and misjudging application scenarios
Some users believe that "explosion-proof = universal", ignoring the applicable scenarios of different explosion-proof standards. For example, the applicable environments of Ex d (flameproof) and Ex e (increased safety) are significantly different. If a non-adaptable model is mistakenly selected in an area with flammable gas, serious accidents may occur.
Key points: Explosion-proof slip rings must meet both current capacity and environmental certifications (such as ATEX, IECEx), and strictly distinguish between gas groups and temperature levels.
Misconception 4: Ignoring the difference between dynamic parameters and static parameters
The "dynamic contact resistance" and "static contact resistance" of slip rings are often confused. Slip rings that perform well in static tests may cause resistance fluctuations due to vibration when rotating at high speed, affecting signal transmission accuracy. This is particularly critical in high-precision scenarios such as automated production lines.
Solution: Require suppliers to provide dynamic working condition test reports, focusing on resistance stability and life curves.
Misconception 5: Excessive pursuit of low prices, ignoring brand technology and after-sales service
Although low-priced slip rings can save short-term costs, inferior materials (such as insufficient gold plating) will cause premature wear of contact points. In addition, brands that lack technical support may not be able to provide customized services (such as sealing structure optimization of IP68 protective slip rings).
Industry data: According to statistics, the equipment downtime loss caused by slip ring failure is usually more than 10 times the purchase cost of the slip ring.
Conclusion
The selection of cable drum slip rings needs to comprehensively consider multi-dimensional parameters such as environmental protection, dynamic load, and explosion-proof standards. For IP68 protection slip rings, long-term sealing needs to be verified; and for explosion-proof slip ring current capacity, a safety margin of more than 20% needs to be reserved. It is recommended to cooperate with suppliers with engineering experience to avoid potential risks through measured data and scenario simulation to ensure long-term and stable operation of the equipment.
FAQ
Q: Are IP68 protective slip rings suitable for underwater scenes?
A: IP68 only represents the highest level of dust and water resistance, but long-term immersion in water requires additional confirmation of the corrosion resistance of the material.
Q: How to calculate the current capacity of explosion-proof slip rings?
A: A comprehensive evaluation is required based on peak current, continuous operation time and heat dissipation conditions. It is recommended to refer to the IEC 60079 standard.
Q: Is the life of the slip ring related to the speed?
A: Yes, high speed will aggravate wear, and the life commitment value at the highest speed must be matched when selecting.
Post time: Feb-27-2025