Double-screw compost turning machine

The double screws windrow turner is a core piece of high-tech equipment in organic fertilizer fermentation; its operational status directly impacts fermentation quality and production efficiency. Centered on the technology of synergistic twin-screw turning, this equipment offers significant advantages over traditional single-screw or rotary-tiller style turners, including greater turning depth, superior material pulverization, and higher operational efficiency. Because the equipment operates in environments characterized by high temperatures, high humidity, and strong corrosiveness—and relies on the coordinated functioning of mechanical structures, drive systems, and electrical controls—it demands rigorous standards for operation and maintenance.

The double screws assembly serves as the "heart" of the machine: two parallel, symmetrically arranged screw shafts rotate synchronously in opposite directions to generate powerful turning force. The screw blades are constructed from wear-resistant alloys or undergo surface hardening treatments. Compared to single-screw models, the twin-screw design provides a wider turning range, greater depth, and superior mixing uniformity. Proper operation and systematic maintenance are essential to ensuring the equipment's long-term, efficient, and stable performance.

Structural Breakdown and Component Description

From the perspective of operation and maintenance, the double screws turner can be categorized into the following modules:

(I) Turning and mixing module: Includes two parallel, symmetrically arranged screw shafts and high-strength, wear-resistant turning blades distributed in a staggered pattern along the shafts; the screw blades are made of wear-resistant high-manganese steel.

(II) Travel and positioning module: Includes the main travel beam, left and right travel mechanisms, and travel wheels.

(III) Power transmission module: Includes the motor, gearbox, and chain or gear transmission mechanism.

(IV) Lifting and adjustment module: Includes hydraulic cylinders and mounting frames.

(V) Electrical control module: Includes the PLC control cabinet and various sensors.

Application Scenarios and Applicable Industries
double screws windrow turners are widely used in facilities requiring large-scale aerobic composting, such as fermentation workshops at large and medium-sized organic fertilizer plants, manure treatment areas at large-scale livestock and poultry farms, composting workshops at municipal sewage sludge treatment plants, agricultural waste centralized treatment centers, as well as compound fertilizer plants, horticultural nurseries, and button mushroom cultivation facilities.

Common Material Types
The double screws windrow turner can process a wide range of organic waste materials, including livestock and poultry manure (chicken, pig, cattle, sheep, etc.), crop straw, municipal sludge, sugar mill filter mud, distillery grains, and pharmaceutical residues.

Working Mechanism and Operational Logic
The working mechanism of the double screws turner relies on the synergy between counter-rotating twin screws and deep-turning action. The two screw shafts rotate synchronously in opposite directions, generating opposing thrust and shear forces on the material. The powerful turning action of the twin screws pulls, kneads, and breaks up the material in all directions. Combined with the directional movement of the travel system, the material is gradually propelled from the feed end to the discharge end of the fermentation tank. A hydraulic lifting system allows the screw turning shafts to be flexibly adjusted according to the height of the material pile.
Troubleshooting and Repair Solutions

Failure to move: Clear debris from the tracks. Check the travel wheels and chains for wear. Inspect the motor and control box for proper operation.

Weak turning/mixing performance: Check the auger blades for wear and replace them promptly. Adjust the material moisture content. Check the tension of the drive chains.

Abnormal noise: Check for damaged bearings. Remove any foreign objects wrapped around the auger shaft. Tighten loose bolts.

Motor tripping: Reduce the feed rate. Verify that the voltage meets requirements. Reset the thermal relay.

Auger blade wear: For minor wear, use a specialized metal repair compound to fill and reinforce the area. Replace the blades promptly if wear is severe.