Hollow Shaft and Rolling Bearing Equipment
Source: Bearing Network | Date: 2014-03-12
Industrial fine grinding mills commonly use rolling bearings, which have been widely adopted in China. These systems help save energy, improve production efficiency, reduce lubricant consumption, lower maintenance costs, and minimize pollution—resulting in significant benefits. However, some manufacturers imitate the design of rolling mills for hollow shaft equipment, leading to several flaws in the current setup. These issues may create challenges for future operations. To address these problems, a more effective equipment method has been proposed for hollow shafts equipped with rolling bearings. The traditional approach involved machining the hollow shaft to fit the bearing's inner diameter, followed by thermal installation. A top sleeve was placed inside the discharge spiral cylinder or lining, bolted to the hollow shaft, and compressed. During operation, the spiral barrels and bolts often loosened, causing misalignment between the top sleeve and the hollow shaft. Dust could then enter the gap and reach the bearing housing, contaminating the grease and leading to increased friction and potential damage. Over the years, through theoretical research and practical exploration, a new and improved method has been developed. This approach has shown excellent results in real-world applications. The new method involves thickening the diameter of the rolling bearing used in the hollow shaft system. Thin oil is utilized to cool the hollow shaft, transferring heat from the shaft to the bearing, keeping its temperature below 60°C. The advantages of this design include: 1. Thin oil provides better lubrication than grease, reducing the friction coefficient and improving energy efficiency. 2. Bearings operate at a stable temperature, which extends their service life compared to dry oil lubrication. 3. An oil level indicator is installed on the bearing housing, allowing operators to monitor the oil level in real time and add oil as needed, preventing damage caused by insufficient lubrication. 4. The bearing housing contains oil, enabling a reduction in the outer diameter of the rolling bearing (as long as the inlet and outlet components meet strength and torque requirements). Flanges are added to both the hollow shaft and the spiral barrel ends, ensuring a secure connection. A compression flange is also included on the bearing's inner ring to prevent axial displacement. Another key advantage is the removal of the outer sleeve, which prevents dust from entering the bearing housing, maintaining clean oil and extending the bearing's lifespan. Additionally, increasing the bearing diameter creates a consistent outer diameter with the hollow shaft, improving the oil chamber design and reducing oil leakage. Finally, thickening the hollow shaft increases the radial clearance between the bearing and the spiral cylinder, offering better insulation and cooling effects, which further enhances the bearing’s performance and longevity.
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