The essence of organic fertilizer production lies in a continuous transformation of material form—shifting from wet, sticky waste to fluffy fermented material, and finally to hard, marketable granules. The half-wet material crusher, double-screw compost turner, and double-roller press granulator occupy three critical nodes in this transformation chain, each resolving a core physical challenge.
The first challenge involves “wet/sticky material versus crushing.” Organic fertilizer raw materials typically have moisture content ranging from 25% to 55%; chicken manure is viscous, straw fibers tangle easily, and decomposed material forms hard clumps. Traditional crushers rely on screens to control output particle size; however, wet material quickly clogs the screen mesh, causing the machine to idle without discharging product. The half-wet material crusher solves this by completely eliminating the bottom screen and adopting a tandem dual-rotor structure: the upper rotor performs coarse crushing and breakup, while the lower rotor handles fine pulverization. After undergoing repeated shearing, impact, and friction within the chamber, the material is discharged directly from the bottom. This achieves a controlled output particle size of 1–3 mm while tolerating moisture levels exceeding 50%. The significance of this step lies not merely in the crushing itself, but in providing “qualified intermediate material”—with controlled particle size and moisture content—for all subsequent processes.
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The second challenge concerns the “interior versus exterior” of the compost pile. Once material in the fermentation tank sits undisturbed, oxygen can only penetrate the surface layer; the bottom gradually enters an anaerobic state, generating hydrogen sulfide and ammonia, while the core temperature fails to rise, causing fermentation to stall. The double-screw compost turner utilizes two parallel, symmetrically arranged screw shafts rotating in opposite directions. Capable of turning depths between 1.5 and 3 meters, it forcibly lifts compacted material from the bottom to the surface and folds dry surface material into the interior, achieving three-dimensional material exchange across the full width and depth of the tank. A single turning pass effectively aerates the entire pile, achieving material mixing uniformity of over 92% and shortening the fermentation cycle from the traditional 15–20 days to just 8–12 days. This step addresses the “time dimension” challenge: by forcibly supplying oxygen to accelerate microbial metabolism, organic matter is transformed into stable humus more rapidly and thoroughly.
The third challenge is the trickiest: how to convert the powder into granules without using water or heat. Fermented, matured materials and pulverized organic powders are typically loose, prone to dusting, and lack a marketable form. While wet granulation requires adding water and subsequent drying, high-temperature drying causes the loss of heat-sensitive components like humic acid. The double-roller press granulator employs a purely physical process: two rollers instantly compress the dry powder into a sheet under pressures of 20 to 50 MPa, which is then crushed and screened into granules. The entire process takes place at ambient temperature without water or drying stages, reducing energy consumption by 30% to 50% compared to wet processing. The granules achieve an immediate hardness exceeding 10 N and can be packaged directly after screening, eliminating the need for a cooling period. The value of this step lies in simultaneously achieving shaping and preservation of bioactivity—providing the powder with a physical shell suitable for storage and transport while fully retaining the bioactive substances accumulated during fermentation.