The double roller press granulator is a high-efficiency dry granulation machine that directly compresses powdered materials into granules. It is widely used in industries such as compound fertilizers, chemical raw materials, metallurgical powders, animal feed, and pharmaceuticals. By utilizing an ambient-temperature extrusion process, it eliminates the need for water addition, drying, and cooling—steps essential to traditional wet granulation methods. It compresses materials into high-density, high-strength, uniform granules in a single pass, truly meeting modern production standards for energy conservation, consumption reduction, and zero-emission environmental protection. The machine features a compact structure and is easy to operate.
Working Principle of Double Roller Press Granulator
Materials are fed uniformly and continuously from a hopper into the gap between two counter-rotating pressure rollers via a screw-type forced feeder. Under the powerful extrusion force provided by a hydraulic system or spring mechanism, the dry powder is compressed and densified. Passing through specially designed pockets or grooves on the roller surfaces, the material is directly formed into shapes such as flattened spheres, strips, olives, or flakes. These formed pieces then enter a crushing and granulating unit to be broken down and shaped, followed by screening to yield the final granules. The entire granulation process requires no added moisture or binders (though small amounts may be added based on specific formulas), involves no steam heating, and generates no wastewater or exhaust gas. Operations are conducted at ambient temperature, fully preserving the active ingredients of the materials.
Structural Components of Double Roller Press Granulator
Frame: A welded steel plate structure offering high rigidity and vibration absorption, ensuring long-term, stable equipment operation.
Extrusion Roller Assembly: Consists of two high-strength rollers rotating synchronously in opposite directions. The roller shells are forged from high-quality high-chromium alloy steel or wear-resistant cast iron, featuring specific hemispherical pockets or elongated grooves on the surface; granule shapes can be customized as needed. The roller shells are individually replaceable, resulting in low maintenance costs.
Drive System: The main motor drives a hardened-gear reducer, which powers the counter-rotating rollers at equal speeds via high-precision synchronous gears. This setup delivers high torque and smooth operation, ensuring uniform material compression.
Feeding Device: A large-capacity hopper paired with a variable-frequency screw feeder prevents material bridging and ensures quantitative forced feeding. This maintains a constant supply of material in the roller gap, thereby increasing the granulation rate.
Pressurization and Adjustment Mechanism: Equipped with a hydraulic station or composite spring pre-tensioning assembly; adjustable pressure allows for precise control of granule compaction. Includes a limit protection device to prevent direct hard contact between roller surfaces, thereby extending equipment lifespan.
Lubrication and Control Systems: Features centralized lubrication for critical bearings and an integrated control console with variable frequency speed regulation. Allows flexible adjustment of main unit and feeding speeds to achieve automated, continuous operation.
Performance Characteristics of
Significant Energy Savings: Dry granulation at ambient temperature eliminates the need for drying and cooling stages, reducing overall energy consumption by 30%–50% and removing the need for auxiliary facilities like boilers.
Superior Granule Quality: Extruded granules feature high strength and bulk density; they are durable, easy to store and transport, and uniform in size. Pelletization rates exceed 90%, with low material recirculation rates.
Environmentally Friendly: Zero emissions of wastewater, waste gas, or dust throughout the process.
Broad Process Adaptability: By changing roller surfaces and adjusting pressure and speed, the system can produce spherical, oblate, or rod-shaped granules (3–12 mm diameter). Suitable for inorganic compound fertilizers, bio-bacterial fertilizers, and various chemical powders.
Ease of Operation and Maintenance: High level of automation enables continuous single-unit production. Wear parts are limited to roller shells, which are quick to replace, ensuring minimal daily maintenance requirements.
Rapid Return on Investment: Streamlined process, low equipment investment, compact footprint, and short installation-to-production cycles allow for quick capacity ramp-up.
Application Fields for
Agricultural Fertilizers: High, medium, and low-concentration compound fertilizers.
Chemical Industry: Granulation of powder raw materials such as catalysts, desiccants, pigments, additives, and zinc oxide.
Metallurgy and Mineral Processing: Concentrate powders, cold-pressed pellets, etc.
Feed and Pharmaceuticals: Binder-free granulation of feed additives, Traditional Chinese Medicine (TCM) powders, etc.
| Model | DZJ-I 1.0 | DZJ-I 2.0 | DZJ-I 3.0 | DZJ-I 3.0 |
| Capacity (t/h) | 1-1.5 | 1.5-2.5 | 2-3 | 3-4 |
| Power (Kw) | 11 | 18.5 | 22 | 45 |
| Roller Dimension(mm) | ø150x220 | ø150x300 | ø186x300 | ø300x300 |
| Feed Material Size(mm) | <=0.5 | <=0.5 | <=0.5 | <=0.5 |
| Output Granules Size(mm) | ø2.5-ø10 | ø2.5-ø10 | ø2.5-ø10 | ø2.5-ø10 |
| Gearbox Model | ZLY-160 | ZLY-160 | ZLY-180 | ZLY-224 |
| Rotation Speed (r/min) | 60 | 60 | 60 | 60 |
