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The core techniques for selecting NPK blending machine  revolve around five key aspects: raw material compatibility, mixing accuracy, capacity matching, stability and durability, and compliance.  These techniques consider both production needs and future maintenance, while also adapting to the “multi-formula, batch production” characteristics of blended fertilizers. Specific practical techniques are as follows:

1. 1. Select the machine model based on raw material characteristics to meet multi-formula requirements: For diverse raw materials such as nitrogen, phosphorus, and potassium granules/powders, trace elements, and fillers, if the materials contain easily hygroscopic or agglomerating components, a feeding system with anti-bridging and anti-caking features should be selected. For small-batch production of multiple formulas, prioritize models with fast batching and easy cleaning to reduce raw material residue when changing formulas.
2. 2. Precisely match capacity, balancing scale and flexibility: Select equipment based on the designed capacity (hourly/daily output) of the NPK blending fertilizer production line, ensuring coordinated capacity across the batching, mixing, and packaging stages to avoid bottlenecks.  Also, reserve a 10%-20% capacity margin to accommodate future production expansion needs without requiring equipment replacement.
3. 3. Strictly control batching accuracy to ensure accurate proportions from the source: The batching system is crucial. Prioritize variable-frequency speed-controlled quantitative batching scales with a single-material batching error of ≤±2%, supporting simultaneous batching of multiple materials.  A matching PLC intelligent control system can store multiple formulas for one-click retrieval, reducing human error.
4. 4. Opt for durable and easy-to-maintain designs to reduce future maintenance costs: The main body of the equipment should be made of thickened, wear-resistant steel, with anti-corrosion and anti-sticking treatment on parts in contact with raw materials. Wear parts (paddles, liners, conveyor belts) should be standard parts for easy replacement. The structure should be simple, with reserved inspection ports for convenient daily cleaning and maintenance, reducing downtime.
5. 5. Consider manufacturer strength and after-sales service to ensure future operation: Prioritize manufacturers with professional experience and extensive case studies in blending fertilizer equipment.  Require services such as equipment testing, installation and commissioning, and technical training. A comprehensive after-sales system (nearby service points, quick response, and parts supply) can significantly reduce production losses caused by equipment failures.