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The tub grinder is a heavy-duty machine used primarily in the forestry and wood recycling industries to process large volumes of wood and organic waste into smaller and manageable pieces, helping improve efficiency. The tub grinder is named for the tub-shaped grinding chamber where the grinding takes place.
The tub grinder is a versatile machine capable of grinding a wide range of materials, primarily focusing on wood and organic waste. Tub grinder offers high throughput, reducing bulky materials into manageable pieces. It is cost-effective, versatile, and environmentally friendly, promoting waste reduction and recycling efforts.
The Structure of Tub Grinder
Tub: The tub is a large, cylindrical container where the grinding process occurs. It is made of heavy-duty steel and is open at the top to allow for easy loading of materials.
Hopper: Located at the top of the tub, the hopper is where the raw materials are fed into the grinder. It often has a wide opening and include a conveyor system to assist in loading.
Grinding Mechanism: Inside the tub, there’s a grinding mechanism consisting of a rotor equipped with heavy-duty hammers or teeth. This rotor spins rapidly to pulverize the incoming material.
Discharge Conveyor: Once the material is ground to the desired size, it’s discharged from the tub via a conveyor system. The conveyor may be located at the rear or side of the machine and can be adjustable to control the discharge height and direction.
Engine: Tub grinder is powered by diesel engines, providing the necessary energy to drive the grinding mechanism and other components.
Control Panel: Where the operator can monitor and adjust various settings such as feed rate, rotor speed, and discharge direction.
Working Principle of Tub Grinder
Material Loading: Raw materials such as whole trees, stumps, branches and other organic waste are loaded into the hopper either manually or via a conveyor system.
Grinding: Once inside the tub, the materials come into contact with the rotating rotor equipped with hammers or teeth. The high-speed rotation of the rotor pulverizes the materials, reducing them to smaller particles.
Size Reduction: As the materials are repeatedly struck by the hammers or teeth and subjected to centrifugal force, they are gradually reduced in size. The size of the final product can be controlled by adjusting factors such as rotor speed and screen size.
Discharge: Once the material reaches the desired size, it’s discharged from the tub via the conveyor system. The ground material can be collected in a pile or loaded directly into trucks or containers for further processing or transportation.
Raw Materials




Whole Tree: Including tree trunks, branches, stumps and limbs.
Brush, Shrub and Vegetation
Wood Waste: Including offcuts, trimmings, defective products, and scrap wood from manufacturing processes.
Green Waste: Organic waste such as yard trimmings, grass clippings, and leaves.
Agricultural Residues: Crop residues, straw, hay, and other agricultural waste materials.
Construction and Demolition Debris: Scrap lumber, timber, and wood waste generated from construction and demolition projects.
Storm Debris: Fallen trees, branches, and other debris resulting from storms and natural disasters.
Pallet: Wooden pallets used for shipping and transportation.
Wooden Furniture: Old or damaged wooden furniture that needs to be recycled or disposed of.
Finished Product


Features of Tub Grinder
- 1. Tub Design: The tub-shaped grinding chamber provides ample space for processing large volumes of material.
- 2. Large Hopper: Tub grinder features a large hopper where raw materials are loaded, allowing for efficient feeding of bulky items such as whole trees, stumps, and branches.
- 3. Powerful Grinding Mechanism: Equipped with a rotor fitted with heavy-duty hammers or teeth, tub grinders can efficiently pulverize a wide range of materials.
- 4. Continuous Operation: Tub grinders are capable of continuous operation, allowing for efficient processing of large volumes of material. They are often used in forestry, land clearing, and recycling applications where high throughput is required.
- 5. Adjustable Discharge Conveyor: The discharge conveyor on tub grinders is often adjustable, allowing operators to control the direction and height of the discharged material for efficient disposal or further processing.
- 6. Durable: Tub grinder constructed with heavy-duty materials such as steel, making it durable and capable of withstanding the rigors of industrial use.
- 7. Versatile: Tub grinder can process various types of materials, including whole trees, brush, pallets, demolition debris, and more for multiple applications.
- 8. Mobile: The tub grinder can be mounted on trailers or tracks, providing mobility and allowing it to be easily transported to different job sites.
- 9. Automatic: Tub grinder can automate the process of grinding and processing materials, and features the intelligent reversal system that can automatically monitor the operation, reducing the need for manual labor and increasing efficiency.
Application of Tub Grinder
Forestry and Land Clearing: Tub grinder is widely used in forestry and land clearing to process trees, stumps, branches, and other vegetation. It can quickly reduce these materials into smaller, more manageable pieces, allowing for easier land clearing and site preparation for construction or reforestation projects.
Wood Processing and Manufacturing: Tub grinder can be utilized in wood processing facilities and manufacturing plants to size-reduce wood waste generated during the production process. This may include offcuts, trimmings, and defective products, which can be ground into wood chips or mulch for resale or use as fuel.
Agriculture and Biomass Production: In agricultural settings, tub grinder is used to process crop residues, straw, hay, and other agricultural waste materials. The ground material can be used as livestock bedding, compost, or as biomass fuel for heating, power generation, industrial boilers.
Construction and Demolition: Tub grinder is employed on construction and demolition sites to process wood waste, including scrap lumber, pallets, and demolished structures. By grinding these materials onsite, contractors can reduce transportation costs and landfill fees.
Municipalities and Public Works: Many municipalities utilize tub grinder for various public works projects, including roadside vegetation management, storm debris cleanup, and park maintenance. Tub grinder can efficiently process large volumes of brush, tree limbs, and other organic waste generated from urban and suburban areas.
Model | Motor Power(kw) | Capacity(t/h) | Feed Port Diameter (mm) | Spindle Speed (r/min) | Engine Power (hp) |
---|---|---|---|---|---|
GMW-2000 | 132 | 8~10 | 2000 | 1450 | 280 |
GMW-3000 | 200 | 10~20 | 3000 | 1450 | 360 |
GMW-3600 | 260 | 20~30 | 3600 | 1450 | 460 |