Simple Compost Turning Machine

Trough compost turner

The simple compost turner—also known as a simple channel-type or rail-mounted turner—is an entry-level aerobic fermentation device designed specifically for small-to-medium-scale organic fertilizer production. Utilizing the principle of channel-based rail turning, it replaces traditional manual turning with a mechanized process, achieving uniform turning, forced aeration, and directional displacement of organic materials within the fermentation channel.

Centered on the design philosophy of simplicity, practicality, low cost, and ease of maintenance, this equipment is tailored for small-to-medium organic fertilizer plants, family farms, large-scale livestock operations, and agricultural cooperatives. It combines a fixed channel layout with a mobile turning mechanism; requiring no complex infrastructure or specialized technical support, it allows for rapid deployment simply by constructing basic fermentation channels and laying rails. Unlike large, intelligent turners that feature complex hydraulic systems and heavy frames, this model employs a lightweight design. Its travel system typically utilizes an electric single- or double-beam rail configuration, where a gear motor drives the wheels to move smoothly along I-beam rails installed on both sides of the fermentation channel.

In practical production, the simple compost turner resolves the dilemmas associated with traditional manual turning—such as high labor intensity, insufficient oxygen supply, and long fermentation cycles—as well as the drawbacks of large, fully automated turners, such as high investment costs and large spatial footprints. The equipment effectively handles the channel-based aerobic fermentation of livestock and poultry manure (chicken, pig, and cattle) mixed with organic solid wastes such as straw powder, spent mushroom substrate, distillers' grains, and municipal sludge.

Overall Structure and Core Components

The simple compost turner features a modular, integrated design and consists primarily of the following five major systems:

(1) Turning Unit (Turning/Throwing Mechanism): This is the core working component of the equipment, comprising a horizontal main shaft, multiple sets of blades or chain teeth (rake teeth) arranged in a spiral pattern, support arms, and associated drive chains. The mixing paddles on the drum are spirally distributed, allowing them to turn and mix the material within the fermentation trough while displacing it by a distance of 0.2 to 1 meter. As the main shaft rotates at high speed, the blades cut deep into the material, lifting the bottom layer, breaking it up, and throwing it backward to create a "fountain-like" turning effect. The robust, durable paddles serve to both break up and mix the material.

(2) Travel Mechanism: Composed of a travel motor, transmission gears, drive shafts, travel sprockets, and other components. This mechanism drives the equipment to move smoothly along rails installed on both sides of the fermentation trough, with an adjustable travel speed typically ranging from 5 to 10 meters per minute. The travel system usually employs an electric single-girder or double-girder rail-mounted design, eliminating the risk of ground-based wheels slipping or getting stuck due to manure accumulation.

(3) Power Transmission Unit: Consisting of a motor, a speed reducer (cycloidal pin-wheel reducer), sprockets, bearing housings, and the main shaft, this unit provides power to the turning drum. The motor transmits power directly to the cycloidal pin-wheel reducer, which then transfers it to the turning drum via the sprocket drive. The system typically uses a variable-frequency motor with an IP55 or higher protection rating; this allows for soft starting to protect the gears and enables rotational speed adjustment based on material resistance. A centralized control cabinet manages operations, offering both manual and automatic control functions.

(4) Lifting Mechanism: Composed of a winch, couplings, drive shafts, and bearing housings; some models are equipped with a hydraulic lifting system (including a hydraulic pump station, solenoid valve assembly, hydraulic hoses, and hydraulic cylinders). The lifting mechanism adjusts the operating depth of the turning drum to accommodate varying material pile heights across different stages of fermentation. (V) Transfer Cart (Optional): Composed of a travel motor, drive gears, a drive shaft, travel wheels, and other components, it serves as a temporary transport vehicle for moving the windrow turner between fermentation channels. When used in conjunction with a transfer carriage, it enables a single machine to operate across multiple channels.

Applicable Fields and Industry Coverage

Simple compost turners have a wide range of applications.

Organic fertilizer production: Suitable for the aerobic fermentation (in-trench) of livestock and poultry manure (chicken, pig, cattle, sheep, etc.) mixed with organic materials such as straw powder, mushroom residue, and distillers' grains.

Environmental protection: Capable of processing organic solid waste, including municipal sludge and kitchen waste.

Agricultural waste treatment: Suitable for handling agricultural by-products such as crop straw, rice husks, and sawdust.

Industrial organic waste treatment: Capable of processing materials like sugar mill filter mud and various types of pomace or meal residues.

Other sectors: Widely used in compound fertilizer plants, horticultural facilities, and button mushroom farms for fermentation, decomposition, and moisture reduction. The equipment can be used in conjunction with solar fermentation chambers, fermentation trenches, and transfer carriages.

Types of usable raw materials
This simple compost turner can process a wide variety of raw materials. These include livestock and poultry manure (chicken, pig, cattle, and sheep manure, etc.); agricultural waste (crop stalks, rice husks, sawdust, etc.); industrial organic waste (sugar mill filter mud, distillery grains, medicinal residues, cassava residue, furfural residue, fruit peel/pulp, etc.); municipal waste (urban sludge, kitchen waste, etc.); and other organic materials (spent mushroom substrate, oil press cakes, dregs, etc.). The equipment accommodates a broad moisture content range (50%–70%) and ensures stable turning performance for both loose and highly cohesive materials.

Operating Principles and Working Mechanisms

The simple compost turner performs fermentation operations by combining rail-based travel with a turning and crushing mechanism. Its workflow consists of three core stages:

Travel and Positioning: The equipment moves smoothly along rails laid on both sides of the fermentation tank. A gear motor drives the travel mechanism, ensuring the machine moves at a constant speed across the entire length of the tank. Limit switches provide safety and positioning control.

Turning and Crushing: This is the equipment's primary operational phase. A motor drives the turning drum to rotate at high speed, while rows of rake teeth on the drum cut deep into the material. These teeth turn, crush, and mix materials—such as livestock manure, straw, and sludge—within the tank, simultaneously moving anaerobic material from the bottom to the surface and surface material to the bottom. This process breaks up compacted material and forces oxygen into the pile, promoting the rapid proliferation of aerobic microorganisms. Uniform turning ensures full contact between the material and the air, providing ample oxygen for aerobic microbial activity.

Shifting and Fermentation: The mixing paddles on the drum are arranged in a spiral pattern, allowing the material to be pushed forward by 0.2 to 1 meter during the turning process. As the equipment operates back and forth, the material gradually moves from the inlet end of the fermentation tank to the discharge end, completing a continuous aerobic fermentation cycle. This entire process accelerates the decomposition of organic matter and reduces moisture content while preventing localized material spoilage.

Core Advantages and Performance Highlights
This simple compost turner offers several outstanding advantages: Low Cost—equipment investment is significantly lower than that of large-scale trough-type turners, with no need for complex infrastructure or specialized electrical control systems. Ease of Operation—equipped with a centralized control cabinet allowing for manual or automatic operation, it can be managed by a single person. Enhanced Efficiency—replaces manual turning or the use of front-end loaders, resulting in a multi-fold increase in productivity. Broad Adaptability—capable of processing various organic wastes and handling materials with moisture content ranging from 30% to 80%. Simple Maintenance—features a streamlined structure without complex components. Reliable Operation—utilizes robust, durable turning paddles, while limit switches provide necessary protection and travel control.