Double Screws Compost Turning Machine

Double Screws Compost Turning Machine

The double screws compost turner is a core fermentation equipment in the fields of organic fertilizer production, livestock and poultry manure treatment, and organic waste resource utilization. Featuring a dual-screw, dual-shaft synchronized drive system, the equipment combines deep-layer mixing, energy efficiency, durability, and intelligent, user-friendly operation to ensure comprehensive aeration and turning of windrows in composting channels. With its outstanding advantages such as large turning depth, wide turning span, uniform turning without dead corners, low energy consumption, and high degree of automation, the double screws compost turner has become the core equipment for large-scale harmless treatment of manure and wastewater and standardized mass production of organic fertilizer.
In terms of the design of key components, the double screws compost turner has been deeply reinforced to address the characteristics of organic fertilizer raw materials, such as high moisture content, high viscosity, sand and fiber content, and strong corrosivity. The screw shafts feature a variable-pitch design, while the screw blades are made of wear-resistant high-manganese steel subjected to specialized heat treatment. The equipment is typically paired with aeration and dust removal systems: the aeration system supplies air to the material layer simultaneously during the turning process, while the dust removal system captures dust generated during operation. Additionally, the machine is equipped with travel limit switches, ensuring a failure rate of less than 0.5%.

Hardware Configuration and Component Functions

The hardware components of the double screws compost turner mainly include: (I) Double screws turning assembly: the core working component of the equipment, consisting of two parallel and symmetrical helical turning shafts and wear-resistant turning blades distributed alternately on the shafts.
(II) Frame assembly: Includes the main beam, truss, and support brackets; features a modular welded structure.
(III) Travel assembly: Includes the main travel beam, left and right travel units, travel wheels, and drive housings.
(IV) Power transmission assembly: Includes the motor, gearbox, and chain or gear transmission mechanism.
(V) Lifting assembly: Includes hydraulic cylinders and mounting brackets.
(VI) Control assembly: Includes the PLC control cabinet.

Application Landscape and Audience Distribution

Double screws compost turners serve a wide range of applications and user groups:
Large and medium-sized organic fertilizer manufacturers: Producing commercial organic fertilizer from livestock manure, crop straw, and other materials.
Large-scale livestock farms: Processing waste such as pig, cattle, and chicken manure; a pig farm with a capacity of 10,000 head, for instance, can process over 120,000 tons of manure annually using this equipment.
Municipal sludge treatment plants: Conducting aerobic composting of urban sludge.
Agricultural waste treatment centers: Processing agricultural by-products such as crop straw and rice husks.
Industrial organic waste treatment enterprises: Processing materials like sugar mill filter mud, distillery grains, and pharmaceutical residues.
Compound fertilizer plants, horticultural nurseries, and button mushroom farms: Used for fermentation, decomposition, and moisture reduction processes.

Material Range and Processing Capacity

The double screws compost turner can process a wide range of organic wastes, including: livestock and poultry manure, straw powder, mushroom residue, distiller's grains, medicinal residue, municipal sludge, and kitchen waste. In terms of processing capacity, the equipment meets diverse production needs, ranging from handling dozens of tons per day to producing tens of thousands of tons annually. It features a turning depth of 1.5 to 2.1 meters and is capable of processing hundreds of cubic meters of compost material per day.

Operational Mechanism and Fermentation Principles

The operating mechanism of the double screws turner is based on a synergistic mode combining counter-rotating twin screws, deep-layer turning, and natural oxygenation. The equipment travels smoothly along the fermentation channel rails while the two screw shafts rotate synchronously in opposite directions; wear-resistant turning blades, arranged in a staggered pattern along the shafts, deeply scoop up, break apart, and pulverize the material within the channel. A hydraulic system precisely controls the lifting height of the screw shafts, allowing for flexible adaptation to varying pile heights and material conditions across different fermentation stages. Driven by the powerful action of the twin screws, the material undergoes a complete exchange between layers—moving from the bottom to the surface and from the top to the bottom. The entire process enables automated, continuous operations encompassing turning, oxygenation, and displacement.

Coordination between the fermentation process and the production line

The double screws compost turner plays a core role in the aerobic fermentation process. The front section of the equipment can be configured with an ingredient mixing system, while the unit operates by moving back and forth within the fermentation tank. Through the deep-turning action of the twin screws, oxygen-deprived "cold material" from the bottom is brought to the surface, and dry "hot material" from the surface is buried within the pile, creating conditions that allow various aerobic microorganisms to thrive within the optimal temperature range. The rear section of the system can be equipped with machinery for crushing, granulation, drying, cooling, screening, and packaging. Its consistent turning performance ensures the supply of high-quality feedstock—characterized by appropriate moisture content and uniform particle size—for the subsequent crushing and granulation stages.

Models and parameters of double screws compost turners