2026/04/10
To ensure that an organic fertilizer ball shaping machine produces granules that are both round and smooth, the primary focus must be on controlling raw material pretreatment. The moisture content of the material should be maintained between 25% and 30%; if too dry, the material tends to crumble and is difficult to mold; if too wet, it is prone to sticking and clumping. Raw materials should be crushed and screened in advance, with particle size variations kept within a 2mm range, while hard lumps and impurities are removed. If the material lacks sufficient cohesion, a small amount of sodium humate or starch slurry can be added as a binder; conversely, for highly viscous materials—such as certain types of manure—straw powder can be blended in to prevent sticking and provide a structural base.
Secondly, it is essential to fine-tune the core parameters of the fertilizer production machine, adjusting the rotational speed and inclination angle according to specific requirements. For small granules (2–4 mm), the speed should be set to 250–300 rpm to rapidly grind away sharp edges; for larger granules (5–8 mm), a lower speed of 150–200 rpm is recommended to prevent breakage. The inclination angle of the rounding disc should be set between 45° and 60°, while the angle of the rounding drum should be between 3° and 8°; reducing these angles increases the material's retention time within the machine, thereby enhancing its roundness. A variable-frequency screw feeder should be utilized to ensure uniform material input, preventing material accumulation that could compromise the effectiveness of the tumbling and polishing process.
During processing, an atomized spray system should be employed to apply small, intermittent doses of clean water or a dilute nutrient slurry. This technique fills microscopic pores and surface indentations on the granules, compacts the outer layer, and significantly improves surface smoothness. The inner walls of the equipment should be lined with wear-resistant, non-stick polyurethane panels; furthermore, any accumulated material adhering to the walls must be promptly cleaned at the end of each shift to prevent clumping and avoid scratching the granules.
Ideally, a two-stage serial rounding process should be adopted: the first stage focuses on initial shaping and de-edging, while the second stage performs fine polishing and finalization. Following the rounding process, the granules should undergo a complementary low-temperature drying and cooling phase to stabilize their physical form, minimize subsequent abrasion, and ultimately enhance the roundness and overall aesthetic quality of the finished product.
