The hydraulic compost turner is a high-efficiency organic fertilizer fermentation machine that integrates hydraulic drive technology into aerobic fermentation and turning operations. Powered by a hydraulic system, it replaces the complex mechanical drive structures found in traditional turners, enabling hydraulic actuation for the three primary functions: turning, traveling, and lifting. These machines are primarily categorized into hydraulic trough-type and hydraulic crawler-type models and are widely used for the aerobic fermentation of organic wastes such as livestock manure, municipal sludge, food waste, sugar mill filter mud, distillery/brewery residues, and straw or sawdust.
The core value of the hydraulic compost turner lies in its use of powerful hydraulic drive and precise control to overcome common industry challenges associated with traditional mechanical turners—specifically insufficient power, frequent jamming, and incomplete turning when handling materials that are highly moist, sticky, or prone to forming large clumps. Capable of a turning depth of 1.5 to 3 meters and delivering 1.5 to 2 times the turning force of standard mechanical models, the equipment easily handles materials with moisture content as high as 65%–80%, such as fresh chicken manure or filter-pressed sludge. The machine travels smoothly along rails on the fermentation trough; the hydraulic system provides robust, steady power to drive the high-speed rotation of the turning drum, while wear-resistant alloy steel tines—staggered across the drum—deeply scoop, break up, pulverize, and throw the material backward.
In terms of automation, these turners are typically equipped with PLC control cabinets or wireless remote controls, enabling fully automated cyclic operations for traveling, turning, lifting, and reversing. When paired with a transfer carriage (shifter), a single machine can service multiple fermentation troughs in rotation. The adoption of hydraulic compost turners marks a significant shift in organic fertilizer fermentation from labor-intensive, rudimentary methods to industrialized, intelligent control; it serves as the core automated equipment for trough-based aerobic fermentation processes in large-scale organic fertilizer production, livestock waste treatment, and municipal sludge resource recovery projects.
Overall Structure and Core Components
The hydraulic compost turner features a modular, integrated design and consists primarily of the following six major systems:
(I) Hydraulic Power System: This is the core component distinguishing the equipment from standard mechanical turners. It comprises a hydraulic pump station (oil tank, hydraulic pump, and motor), a hydraulic control valve assembly (relief valves, directional control valves, throttle valves, etc.), hydraulic piping, and a radiator. The hydraulic system provides all the power required for the rotation of the turning drum, the movement of the travel mechanism, and the operation of the lifting device. It utilizes components from renowned brands and is equipped with an air-cooled radiator to ensure stable oil temperatures during prolonged, high-load operation. The main hydraulic circuit operates at a pressure of 12–18 MPa.
(II) Turning/Agitation Assembly: This is the working component that acts directly on the material. It consists of a turning drum (or alternatively, a chain-plate or spiral shaft) and high-strength tines (mixing teeth or blades) mounted on the drum. Multiple mixing blades are arranged in a spiral pattern around the drum's circumference. The mixing teeth are cast from high-chromium alloy steel and feature a wear-resistant hard-faced coating, achieving a hardness exceeding HRC60. The spacing between the teeth is optimized via fluid dynamics simulation to ensure powerful cutting of long fibers (such as those found in cattle manure or straw) while preventing material entanglement and clogging.
(III) Travel and Positioning System: This system includes hydraulic travel motors, drive wheels, drive-shaft sprockets, chains, and front and rear travel wheels. The hydraulic travel motors drive the sprockets on the main shaft via chains, propelling the front and rear travel wheels smoothly along the rails on both sides of the fermentation tank. Some crawler-type models utilize a hydraulic tracked undercarriage for movement. Travel speed is typically controlled at 3–6 meters per minute.
(IV) Hydraulic Lifting Device: This assembly consists of hydraulic cylinders, suspension arms, and drive arms. The ends of the drum are suspended from the main frame by suspension arms; hydraulic cylinders actuate the drive arms to position the drum at the appropriate depth within the compost tank or to raise it to the underside of the frame. Lifting is generally achieved by raising or lowering the entire turning assembly using hydraulic cylinders located at the four corners of the frame, allowing for a constant working depth to be set according to the fermentation stage. The working depth is continuously adjustable, typically within the range of 0–1.8 meters or 0–2.5 meters.
(V) Frame and Rail System: The frame spans the composting channel and is constructed from welded high-strength steel. Rails are installed atop the partition walls on both sides of the fermentation channel. The span of the machine can be customized according to specific customer requirements.
(VI) Electrical Control System: Includes a centralized control cabinet, an operator console, and various sensors. The control cabinet provides centralized management, supporting both manual and automatic operation. Certain high-end models are equipped with PLC control systems and wireless remote control units.
Applicable Fields and Industry Coverage
Hydraulic compost turners have a wide range of applications. In organic fertilizer production, they are suitable for the large-scale aerobic fermentation of livestock and poultry manure (such as chicken, pig, cattle, and sheep manure). In environmental protection, they can process organic solid waste, including municipal sludge and kitchen waste. They handle agricultural waste such as crop stalks and rice husks, as well as industrial organic waste like sugar mill filter mud and various pomaces or press cakes. Additionally, they are widely used in compound fertilizer plants, horticultural facilities, and Agaricus bisporus (button mushroom) farms for fermentation, decomposition, and moisture reduction. The equipment can be used in conjunction with solar fermentation chambers, fermentation troughs, and transfer machines.
Operating Principles and Working Mechanisms
The operating principle of the hydraulic compost turner relies on the synergy between hydraulic drive and mechanical turning. Its operation comprises three core stages:
Hydraulic Power Output: An electric motor drives a hydraulic pump to draw hydraulic fluid from the reservoir; the fluid is regulated by a control valve assembly and distributed to various actuators. Hydraulic motors drive the machine's travel along its tracks and spin the turning drum at high speeds, while hydraulic cylinders adjust the drum's working depth.
Turning and Pulverizing: A high-power hydraulic motor drives the turning rotor at high speed. Alloy mixing tines, arranged in a spiral pattern on the rotor, cut deep into the material, breaking up and tossing compacted matter to ensure full exposure to air. With a turning force 1.5 to 2 times that of standard models, it easily pulverizes organic materials characterized by high moisture, high viscosity, and large clumps.
Lifting and Adaptation: A hydraulic lifting mechanism adjusts the rotor's position in real-time based on the height of the compost pile. This deep-turning method brings oxygen-deprived "cold material" from the bottom to the surface while burying dry "hot material" from the surface into the interior.
Types of usable raw materials
The hydraulic compost turner is capable of processing a wide variety of raw materials. These include livestock and poultry manure (such as pig, cattle, chicken, and sheep manure), agricultural waste (such as crop stalks and rice husks), industrial organic waste (such as sugar mill filter mud, distillery grains, and pharmaceutical residues), and municipal waste (such as urban sewage sludge and kitchen waste). The equipment accommodates a broad range of material moisture content (up to 65%–80%) and ensures stable turning performance for both loose materials and high-moisture, sticky materials.
