NPK compound fertilizer production lines operate continuously over long periods under heavy loads and in dusty environments, making equipment prone to issues such as wear, material blockages, and jamming. Standardized daily maintenance is crucial for ensuring stable operation, extending equipment lifespan, and reducing production costs. Effective daily maintenance primarily covers five core areas: cleaning and inspections, equipment lubrication, component checks, electrical system maintenance, and shutdown maintenance.

Daily cleaning and comprehensive equipment inspections form the foundation of maintenance. Production generates significant amounts of fertilizer dust and material residue, which can easily clog equipment gaps, screens, and pipelines. After each shift, residual material must be thoroughly cleared from granulators, mixers, conveyors, and screening equipment to prevent hardening or caking that could hinder the next startup. Simultaneously, inspection personnel must monitor the equipment's operating status—checking for abnormal noises, vibrations, material leaks, or oil leaks—to identify potential blockages early and prevent operation with existing faults.
Regular lubrication is essential for minimizing wear. Moving parts such as bearings, gears, speed reducers, and drive chains are susceptible to wear and aging due to prolonged high-speed operation. Operators must strictly follow the equipment manual to apply the correct type and quantity of lubricants at scheduled intervals, avoiding issues like dry friction from lack of oil or the mixing of incompatible lubricants. Additionally, the lubrication system should be checked for leaks, and degraded lubricants replaced promptly to ensure smooth transmission and significantly reduce the equipment failure rate.
Routine inspection and replacement of wear-prone parts are indispensable. Components such as double-roller press granulator shells, screens, liner plates, scrapers, and conveyor belts are key targets for daily checks. Regular monitoring for wear, deformation, or loosening is required; minor wear should be addressed through adjustments or tightening, while parts exceeding wear limits must be replaced immediately. This prevents issues such as poor granule formation, incomplete screening, or conveyor belt misalignment, thereby ensuring the quality of the compound fertilizer granules and maintaining production efficiency.
Maintenance of electrical and safety systems must not be overlooked. Conduct daily inspections of the operating status of motors, wiring, control cabinets, and sensors; clean dust from the surfaces of electrical equipment; and check wiring connections for looseness or signs of aging to eliminate risks of short circuits or electrical leakage. Additionally, verify that emergency stop switches and safety guards are intact and functional, ensure responsive equipment start-stop operations, and prevent workplace safety accidents.
Finally, perform shutdown maintenance and maintain proper records. For extended shutdowns, empty the equipment of materials and implement anti-rust and dust-proofing measures; maintain a standardized maintenance log by recording daily operating parameters, maintenance activities, and details regarding any malfunctions and their resolutions. Standardized daily maintenance not only ensures stable, continuous 24-hour production for the NPK compound fertilizer line but also significantly reduces maintenance costs and effectively boosts the enterprise's production efficiency.