Introduction to the latest technologies for repairing wear at reducer bearing locations

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Sorey SD7101 is a highly thixotropic nanometal-based polymer composite, which is a high-performance two-component epoxy composite reinforced with nanometric inorganic materials. The greatest advantage of this material is that it utilizes special nano-inorganic materials to form bonds with the oxygen atoms in epoxy ring molecules, thereby enhancing the bond strength between molecules and significantly improving the overall performance of the material. It can adhere well to various materials such as metals, concrete, glass, plastics, and rubber. It has good resistance to high temperatures and chemical corrosion. At the same time, good machinability and wear resistance can facilitate the remanufacturing of metal components. The vertical mill reducer is one of the key equipment in a enterprise. If there is a clearance in its mechanism during operation, it can cause severe damage to the drive shaft and transmission gears, leading to significant downtime and production interruptions, which in turn results in huge economic losses for the enterprise. Once wear occurs in the bearing chamber of a reducer, replacing the components is costly and the manufacturing process is time-consuming. Common repair methods include disassembly, welding, followed by machining, or enlarging the hole and inserting a steel sleeve; these approaches are labor-intensive and expensive. Sorei Industrial’s polymer materials possess extremely high pressure resistance and adhesion strength, as well as a \"yielding property\" that metals lack. This enables them to ensure 100% fit between the surfaces after repair, while also meeting the requirements of operational conditions. The repair process is simple to operate; by simply applying the material and carrying out machining, the repair accuracy can be effectively ensured, without any concentration of thermal stress. This allows for a reduction in the time required to repair the equipment, thereby generating significant economic benefits for businesses while ensuring the normal operation of the equipment. During maintenance work at a certain company, it was found that the high-speed shaft of the HRM1900 vertical mill reducer was worn. Due to the significant extent of the wear, traditional repair methods were not feasible; ordering a replacement part from the manufacturer would take at least 2 months. The relevant data is as follows: Journal diameter: 220mm ； Axle width: 143mm ； Rotation speed: 980 revolutions per minute ； Wear dimension: 6mm ； Operating temperature: 65–85°C (see the image on the second floor). For more details, please visit the official website of Zibo Sorei Industrial Equipment Maintenance Technology Co., Ltd.!