To ensure the more stable operation of the NPK fertilizer produciton line, the following aspects can be considered:

1. Develop a preventive maintenance plan: Regularly inspect, maintain and repair all important components of the production line, which helps to avoid unexpected downtime and extend the service life of the equipment.

2. Adhere to strict safety protocols: Protecting the safety of employees and organic fertilizer equipment is of vital importance. This includes the use of protective clothing, appropriate training on equipment operation, and emergency response techniques.

3. Keep the equipment clean: Regularly clean the machine to prevent the accumulation of materials that may affect operational efficiency. Special attention should be paid to removing any fertilizer residues that may be corrosive.

4. Timely replacement of worn parts: Timely replacement of worn or damaged parts is crucial for avoiding mechanical failures. Internal reserves of key spare parts can significantly reduce downtime caused by equipment failures.

5. Continuously train maintenance personnel: Ensure that all maintenance personnel have received effective training and are familiar with the latest protection protocols and safety standards. Continuous training in evolving technologies and first-class mechanical protection practices helps to identify potential problems before they lead to serious ones.

Through the above measures, the stable operation of the nitrogen, phosphorus and potassium fertilizer production line can be effectively ensured, production efficiency can be improved, equipment failure rate can be reduced, and the safety and health of employees can be guaranteed at the same time.