Energy-Saving Practice of Oil-Air Lubrication for Weighing and Marking Roller Tables
Release time:
2025-08-07
In the metallurgical industry, weighing and marking roller tables play a critical role in steel coil transportation lines. These roller tables are strategically installed to support inspection, strapping, weighing, printing, and marking of steel coils in accordance with production requirements.
However, due to harsh operating conditions—including heavy loads, high temperatures, extremely low speeds, steam exposure, and the risk of water and contaminants entering bearing housings—effective lubrication has long been a major challenge.
Traditional lubrication methods often lead to problems such as pipeline blockage, frequent roller seizure, excessive lubricant consumption, and environmental pollution. Selecting an appropriate lubrication solution is therefore essential for stable and efficient operation.
Oil-air lubrication, a typical application of gas–liquid two-phase cooling and lubrication technology, offers an effective solution. In simple terms, precisely metered lubricant is mixed with compressed air to form a mist-like oil-air flow, which is delivered to lubrication points as fine oil droplets. This ensures neither over-lubrication nor under-lubrication.
By using high-viscosity lubricating oil, the system forms a gas–liquid lubrication film with sufficient thickness and load-carrying capacity, keeping bearings in an optimal lubrication state. At the same time, compressed air escaping from the bearing housing removes excess heat, effectively reducing bearing temperature.
Oil-air lubrication is also highly adaptable to different lubricant types. It is not limited by oil viscosity and can reliably deliver light oils, semi-fluid greases, and even lubricants containing a high proportion of solid additives. As the air content in the two-phase flow increases, the lubrication film becomes thicker, resulting in a higher film formation rate and significantly improved load capacity compared to single-phase liquid lubrication.
When applied to bearings, the system maintains a positive pressure of approximately 0.1–0.3 bar inside the bearing housing. This positive pressure acts as an effective seal, preventing the ingress of water, harmful gases, iron oxide scale, and other contaminants.
From an economic perspective, oil-air lubrication delivers a clear return on investment. Lubricant consumption is only a fraction of that required for oil mist lubrication, dry grease lubrication, or traditional oil circulation systems. In most cases, the investment can be recovered within six to twelve months.
Practical applications have proven that oil-air lubrication performs exceptionally well on weighing and marking roller tables, especially under extreme operating conditions. The technology significantly improves lubrication efficiency, stabilizes bearing operation, extends bearing service life, and sharply reduces lubricant consumption, water treatment costs, and unplanned downtime. Overall operating and maintenance costs are reduced by at least 85%, while labor intensity is greatly lowered—bringing substantial economic benefits to metallurgical enterprises.
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