Features and Working Principle of Double Roller Press Granulator

The double roller press granulator is a drying-free granulation equipment based on high-pressure physical extrusion molding technology. It is widely used in fertilizers, chemicals, pharmaceuticals, feed, and other fields. With its high efficiency, energy saving, and wide adaptability, it has become the preferred equipment for small and medium-sized production enterprises. Its core working logic and unique performance constitute the core competitiveness of the equipment. The following details its working principle and main features.

The working principle of the double roller press granulator is based on dry extrusion molding, eliminating the need for high-temperature drying and additional binders. The core process consists of four steps. First, power transmission: the motor drives the reducer via a belt pulley, and then the drive shaft drives the driven shaft to achieve synchronous reverse rotation, ensuring precise and consistent rotation speed of the two rollers. Second, extrusion molding: the pre-treated powdered material is uniformly fed into the gap between the two rollers via a conical spiral feeder. The two rollers rotate at low speed, applying a gradient increasing pressure, causing the material to be compacted within the precise grooves of the rollers, binding together into a dense cake-like mass through intermolecular forces. Finally, demolding and crushing: the formed cake is removed from the grooves as the rollers rotate and falls into the crushing chamber, where it is cut into regular granules by blades. Finally, the particles are screened and output. The particles are graded by a vibrating screen, with qualified particles discharged and oversized particles returned to the crushing stage for secondary granulation, achieving raw material recycling.

This equipment has very distinct features. Its primary advantages are energy saving, environmental protection, and low cost. Utilizing a room-temperature granulation process, it eliminates the drying stage, reducing energy consumption by 40%-60% compared to traditional equipment. It also produces no waste, meeting green production requirements. Furthermore, it requires small investment and yields quick results, making it suitable for small and medium-sized enterprises with limited funds. Secondly, it has wide raw material adaptability, processing over 20 kinds of materials including compound fertilizers, organic fertilizers, metal ore powders, and chemical raw materials. It can produce particles of different sizes from 2.5 to 40 mm, and is particularly suitable for rare earth and ammonium sulfate-based compound fertilizer granulation, filling a gap in related fields.

In addition, the equipment operates stably and is easy to use. The rollers are made of high-quality wear-resistant materials, and the tungsten carbide coating significantly extends their service life. The dual-output reducer ensures smooth operation, and maintenance is simple, enabling continuous production. It has a high granulation rate, good particle strength, and a breakage rate of less than 1%, effectively reducing raw material waste. Meanwhile, the equipment boasts a compact structure, small footprint, and rational process layout, allowing for flexible integration into small production lines to meet production needs of varying scales.

In summary, the double-roller press granulator, with its simple and efficient working principle, energy-saving and environmentally friendly core features, and a balance of practicality and economy, plays a vital role in granular fertilizer production lines, becoming a key piece of equipment for promoting energy conservation, emission reduction, and improved production efficiency in the industry.