NPK blending machine—also known as complete BB fertilizer production lines—is primarily used to precisely weigh and uniformly mix various granular raw materials—such as urea, monoammonium phosphate (MAP), potassium chloride, and fertilizers containing secondary and trace elements—according to specific formula ratios, thereby producing qualified blended fertilizers. The entire system employs a physical blending process that requires neither granulation nor drying. It features a streamlined workflow, low initial investment, low energy consumption, and flexible formula adjustment capabilities, making it ideal for batch production in small to medium-sized fertilizer plants.

The equipment mainly consists of raw material hoppers, an automatic batching system, a mixing system, a screening system, a finished product bin, an automatic packaging system, and a PLC control system. Raw materials are transported via elevators into multiple independent storage hoppers; these hoppers are equipped with arch-breaking devices to ensure smooth discharge and prevent material bridging. The batching system utilizes electronic weighing technology to achieve high metering precision, automatically dispensing precise quantities of various raw materials according to pre-set formulas, while allowing for quick and convenient formula switching. Once weighed, the various raw materials simultaneously enter a twin-shaft paddle mixer, where they undergo thorough and uniform mixing within a short timeframe; this ensures high mixing uniformity and effectively prevents nutrient segregation. After mixing is complete, the material passes through a vibrating screen to remove any lumps or impurities. The qualified material is then temporarily stored in the finished product bin before being processed by an automatic packaging machine, which handles precise bagging, bag stitching, and conveying, thereby enabling continuous production operations.

The entire production line features a fully enclosed structure and is equipped with dust removal devices, resulting in a production environment with minimal dust, ensuring cleanliness and environmental compliance. The equipment operates stably, is easy to operate, and is convenient to maintain; furthermore, it can be flexibly configured to meet specific output requirements. It is widely used for the production of general-purpose NPK blended fertilizers, crop-specific fertilizers, and blended fertilizers containing secondary and trace elements, making it a currently popular, economical, and practical complete equipment solution for blended fertilizer production.