The simple compost turning machine (also known as a simple compost turner) is a piece of mechanized turning equipment designed specifically for aerobic fermentation of organic waste on a small-to-medium scale. It spans the rails on both sides of the fermentation trough and is driven by a motor to travel longitudinally along the trough; simultaneously, rotating rake teeth scoop up the material from the bottom, scatter it, and push it backward, thereby achieving material turning, aeration, and mixing.

What is the working principle of a simple compost turning machine?

The working principle of a simple compost turning machine can be summarized as the coordinated interaction of two actions.

Travel action: A motor and gear reducer drive the wheels, propelling the entire machine at a constant speed along tracks on both sides of the fermentation trough. The equipment typically employs either a single-side drive or a wire-rope traction system, ensuring a simple and reliable structure.

Turning action: While the machine travels, a turning motor rotates the main shaft. High-strength alloy rake teeth (or mixing paddles) fixed to the shaft cut into the material layer, continuously scooping up, scattering, breaking apart, and pushing the organic material within the trough toward the rear.

This process achieves two key functions: First, forced oxygenation—anaerobic material from the bottom is turned to the surface while surface material sinks to the bottom, ensuring the pile makes full contact with the air to rapidly replenish oxygen and release water vapor and exhaust gases. Second, temperature regulation—the turning operation helps maintain the pile temperature within the 55-65℃ range required for high-temperature decomposition, which is the optimal temperature zone for aerobic microbial activity.

Through periodic turning every 1 to 3 days, the fermentation cycle—which would normally require 30 to 60 days for natural composting—can be shortened to 10 to 20 days, achieving a decomposition uniformity of over 90%. Some semi-automatic models can even further compress the fermentation cycle to between 7 and 15 days.

What are the main components of a simple compost turning machine?

The structure of a simple compost turning machine is straightforward, consisting primarily of six major components:

Frame: Welded from high-quality carbon steel or channel steel; it provides a stable structure and supports the weight of the entire machine.

Travel Mechanism: Includes a travel motor, a speed reducer, and travel wheels; it operates along rails installed on both sides of the fermentation trough.

Turning Drum: Equipped with high-strength, wear-resistant tines (typically made of high-manganese steel or high-chromium alloy) arranged in rows or a spiral pattern.

Drive System: A motor transmits power to the turning drum via a cycloidal pin-wheel reducer and sprockets.

Electrical Control Cabinet: Features a simple control system with intuitive functions and one-touch start/stop operation.

Rails: Typically constructed using light-duty rails (No. 14-16) or angle iron (50mm angle steel).

What are the typical application scenarios for simple compost turning machines?

Small and medium-sized organic fertilizer plants: Organic fertilizer production lines with an annual output of 3,000 to 20,000 tons.

Large-scale livestock farms: On-site harmless treatment and resource utilization of livestock and poultry manure.

Agricultural cooperatives and family farms: Composting and fermentation of agricultural waste such as crop stalks and spent mushroom substrate.

Sludge treatment plants: Aerobic fermentation of municipal sludge and sugar mill filter mud.

Horticulture and button mushroom cultivation: Fermentation and maturation of growing substrates.

Selection Criteria and Maintenance Tips for Simple Compost Turning Machines

How to Choose the Right Model

When purchasing a simple compost turner, consider the following factors:

Step 1: Confirm fermentation channel dimensions. Measure the clear width and depth of your existing channel and select a model with a drum length matching the width and a diameter matching the depth. Choose a push-type model for channel widths of 1.2-1.5 meters, and a standard small model for widths of 1.5-2.5 meters.

Step 2: Assess daily processing capacity. Select a micro-model for a daily capacity of 1-3 tons, and a standard small model for 3-10 tons. This avoids either insufficient capacity or equipment over-specification.

Step 3: Consider materials. Prioritize rake teeth made of high-manganese steel or high-chromium alloy for superior wear resistance and longevity. The frame and rake teeth should be made of rust-resistant materials to ensure stable operation in the consistently humid and highly corrosive environment of the fermentation channel.

Step 4: Evaluate the manufacturer. Prioritize manufacturers that offer comprehensive after-sales service, ensuring access to on-site installation, operational guidance, and maintenance support.

Daily Maintenance Tips

Maintaining a simple compost turning machine is straightforward, but consistent care significantly extends the equipment's lifespan:

Daily: Clear debris from the turning teeth and track surfaces; check that all fasteners are secure.

Periodically: Check the reducer oil level and top up with sufficient gear oil; inspect the contactors within the electrical control cabinet.

After shutdown: Promptly remove fibrous materials wrapped around the drum shaft; regularly apply grease to the bearing housings.

Rake tooth replacement: Replace teeth promptly when wear exceeds one-third of their original length; failure to do so will result in incomplete turning.