Setting up a fertilizer roller press  granulator production line requires attention to seven key aspects: raw material compatibility, equipment selection, foundation layout, power supply, process matching, installation and commissioning, and safe operation and maintenance.

I. Raw material compatibility is a prerequisite. Extrusion granulation is a dry, room-temperature granulation process. The moisture content of the raw material needs to be controlled between 12% and 20%. Too high a moisture content will cause sticking to the rollers, while too low a moisture content will result in a low granulation rate. It is recommended that 90% of the material be passed through 60-80 mesh. Impurities and hard lumps must be removed to avoid damaging the rollers. The mixing uniformity should be ≥95%, and a horizontal mixer is preferred to ensure consistent nutrients and stable granule strength.

II. Fertilizer produciton machine selection must match production capacity and formula. The core is the doublr roller press granulator. The roller diameter, roller width, and pressure range (10-30MPa) must be selected according to the hourly output (1-10 tons). The supporting equipment includes: batching system → crusher → mixer → granulator → screening machine → return material system → packaging machine, forming a closed loop. The return material ratio should be controlled at **15%–25%**.

III. Workshop Layout and Foundation Must Be Stable. The total length of the production line is approximately 20–30 meters, arranged in a straight line or U-shape according to the sequence of "raw materials → batching → mixing → granulation → screening → finished product". The main unit requires an independent concrete foundation of C30 or higher, with a horizontal error ≤3mm/m, and anti-vibration pads to prevent vibration from causing bolt loosening and roller misalignment. A maintenance space of **≥1 meter** should be left around the perimeter, and sufficient height should be reserved for hoisting positions.

IV. Power Supply and Supporting Facilities Must Be Sufficient and Stable. The main unit has a large installed power and requires 380V three-phase power with voltage fluctuations ≤±5%. An independent distribution cabinet and reliable grounding are required. Compressed air (0.4–0.6MPa) is used for pneumatic valves and packaging, and circulating water is used to cool rollers and bearings.

V. Strict Process Parameters and Installation/Debugging: Roller gap must be controlled within 0.2–0.5 mm, with consistent gaps at both ends to avoid uneven pressure and particle size distribution. Perform a 2-hour no-load test run; if no abnormal noises and normal temperature rise are observed, gradually increase the load, monitoring particle yield (≥90%), particle strength (≥20N), and return material amount.

VI. Maintenance and Safety Cannot Be Neglected: Regularly check roller surface wear, bearing temperature, and belt tension; keep roller surfaces clean to prevent material adhesion and uneven loading. Ensure emergency stop devices, protective covers, and warning signs are in place; unauthorized manual cleaning of the roller surface is strictly prohibited.