The BB fertilizer blender (bulk blending fertilizer mixer) achieves uniform mixing of multiple fertilizer components in specified proportions through mechanical agitation. Its core working principles and operation process are as follows:

I. Core Working Principles

1. Mechanical Agitation Mixing
   Rotating mixing drums or paddles induce rolling, convection, and shear movements among fertilizer particles of varying densities, achieving physical blending. Key mixing methods include:
   • Drum-type mixing: The drum rotates while internal lifting plates elevate and cascade fertilizer particles for continuous blending.
   • Twin-screw mixing: Two parallel screws rotate in opposite directions, driving particles horizontally and vertically for enhanced uniformity.
   • Vertical mixing: A vertical screw facilitates particle movement through lifting and descending actions.
2. Mixing Mechanisms
   • Convection mixing: Large-scale displacement of particle groups for overall blending.
   • Diffusion mixing: Localized interpenetration between adjacent particles to refine uniformity.
   • Shear mixing: Slippage between particles due to velocity differences to break up agglomerates.
3. Key Structural Design
   • Mixing chamber: Typically made of carbon steel or stainless steel (for corrosion resistance), equipped with specialized spiral mixing blades.
   • Power system: A motor drives the mixing mechanism via a gear reducer, with rotational speeds of 20–40 rpm to prevent particle breakage.
   • Feeding/discharging: Metering devices at the inlet control component ratios, while the outlet uses gates or screw conveyors. Some models integrate dust extraction ports to minimize airborne particles.

II. Typical Operational Workflow (Integrated BB Fertilizer Production Line)

1. Storage System: Raw fertilizer materials are stored in silos.
2. Feeding System: Feeders transfer materials to metering devices at predetermined ratios.
3. Metering System: Precision scales ensure accurate component proportions.
4. Conveying System: Inclined belt conveyors elevate materials to the blender.
5. Mixing Process:
   • The rotating drum or screws lift and cascade particles, creating up-and-down rolling motions.
   • Advanced models employ reversible rotation, conical bottom transitions, and three-dimensional mixing structures to eliminate dead zones and achieve >95% uniformity.
6. Automatic Packaging: Mixed fertilizers are weighed and packaged via automated filling machines, followed by sealing.
7. Finished Product Handling: Conveyor belts transport packaged fertilizers to storage or dispatch areas.
8. Computer Control System: Monitors and adjusts parameters in real time to ensure stable production.

III. Technical Advantages

1. High Mixing Uniformity
   • Post-mixing nutrient coefficient of variation (CV) ≤5%, meeting agricultural standards.
   • Innovative "dead zone-free" designs (e.g., conical bottoms, eccentric shafts, adjustable chamber angles) elevate uniformity to >95%.
2. Versatility
   • Handles particles sized 1–5 mm with density differences ≤30%.
   • Flexible adjustment of NPK and micronutrient ratios supports soil-testing-based fertilization.
3. Reliability
   • Dual vibration isolation and multi-stage filtering ensure metering accuracy.
   • Control systems support manual, automatic, and hybrid operation modes.
4. Low Maintenance
   • Regular checks on bearing seals prevent corrosion from fertilizers.
   • Residue cleaning prevents clogging and extends equipment lifespan.