Vertical mills play a pivotal role in industries such as power generation, metallurgy, cement, chemical, and non-metallic minerals. Renowned for their convenience, compact footprint, high individual capacity, and stable performance, vertical mills boast numerous advantages. However, they face complex operating conditions, with varying material particle sizes and hardness. As these materials rapidly move within the grinding drum, generating high temperatures, severe friction, abrasion, and impacts occur on components like the mid-speed grinding roller sleeve.
Taking the actual working conditions of the grinding roller shaft protective sleeve in a Loesche 56.4 raw material mill as an example, the outgoing air volume generally ranges from 650,000 to 750,000 cubic meters per hour. The internal ventilation volume exceeds 300 m³/min, and the inlet temperature reaches 240°C. Many companies currently use 8mm+6mm composite wear-resistant steel plates for the roller shaft sleeves. Due to the large particle size of the materials and the presence of metal elements like iron nails and screws, severe wear occurs, rendering the roller shaft sleeves ineffective after just eight months of use.
In response to such severe wear under operational conditions, adopting a dovetail ceramic hybrid structure composite liner proves to be an effective solution. This innovative approach ensures a tenfold extension of the roller sleeve's lifespan.
So, what are the three major advantages of ceramic protective sleeves for vertical mill grinding roller shafts?
Wear-resistant ceramics exhibit a hardness surpassing that of wear-resistant steel, reaching HRA85 or higher. This heightened hardness translates to outstanding wear resistance, forming the foundation for prolonging the lifespan of vertical mill grinding roller shafts.
The ceramic protective sleeves for vertical mill grinding roller shafts by Precision Ceramics employ a dovetail-shaped ceramic affixed to the vertical mill's steel structure. High-temperature-resistant inorganic adhesive fills the gap between wear-resistant ceramics and steel plates, ensuring a zero-gap design. The 360° staggered bonding process results in a smooth surface, significantly enhancing reliability by preventing detachment or material entanglement.
During practical usage, the ceramic protective sleeve's impact resistance can be strengthened by selecting ceramic-rubber composites based on temperature or opting for ZTA (zirconia-alumina) composite liners. Additionally, introducing a liner design with protrusions enhances the impact resistance threefold, providing triple assurance for the protective sleeve's impact resistance.
Given these three major advantages, the lifespan of vertical mill grinding roller shafts with ceramic protective sleeves has surpassed that of wear-resistant steel protective sleeves by more than tenfold. It has emerged as the latest and preferred choice for many manufacturers.
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Sanxin New Materials Co., Ltd. focus on producing and selling ceramic beads and parts such as grinding media, blasting beads, bearing ball, structure part, ceramic wear-resistant liners, Nanoparticles Nano Powder
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