The 4000 kW planetary gear reducer for scraper conveyors, developed by Tiandi Benniu, features an integrated design that combines the gear transmission system with a condition monitoring and fault pre-diagnosis system. It employs a series of technologies, including unique gear parameter matching, integration of oil quality sensors with a forced lubrication system, and more. The design incorporates a high-strength L-shaped housing structure and a monitoring device for multi-source data analysis. The product is characterized by its compact size, high transmission efficiency, excellent adaptability, and high integration level. It can address the issues faced by existing 3000 kW reducers, such as the inability to meet the development demands for increased torque output, longer working face lengths, and further production capacity enhancements.