Galvanized Drum Screener

Brief Introduction

TONY Galvanized Drum Screener is a low-speed rotating screening device featuring a drum treated with a hot-dip galvanized anti-corrosion coating; it serves as a core sorting component in the pre-treatment stage of biomass pellet production lines. It primarily classifies and screens pulverized materials—such as sawdust, wood chips, and chopped straw—separating out oversized particles, wood chunks, and impurities for return to the pulverizer for re-processing, while allowing qualified fine material to pass to the subsequent pelletizing stage.

Compared to standard painted drum screens, the galvanized drum screener offers superior resistance to corrosion from organic acids found in sawdust and from moisture, making it suitable for humid workshop environments and outdoor operations. Furthermore, compared to vibrating screens, the rotary drum's tumbling action prevents screen clogging and offers greater adaptability to loose, slightly moist biomass materials.

Working Principle

In simple terms, material enters an inclined, rotating galvanized drum; the rotation of the drum and the action of internal lifting plates facilitate classification. Fine material passes through the screen to the next processing stage, while large impurities are discharged from the tail end for re-crushing, thereby completing the raw material sorting process. The galvanized drum screen is a low-speed, rotating screening device installed at an incline. A motor and gearbox drive the slow rotation of the galvanized drum, into which material is fed at the inlet. Inside, lifting plates continuously scoop up and tumble the material; fine, compliant material falls through the screen mesh—becoming the screened product—and is conveyed to a storage bin.

Large wood chunks, incompletely crushed coarse material, and impurities move along the drum's incline toward the discharge end; they are then expelled from the tail and returned to the crusher for further processing.

Continuous tumbling of the material minimizes fiber buildup and screen clogging. An optional comb-tooth cleaning mechanism can be installed to continuously clear wood fibers lodged in the screen apertures, ensuring consistent screening efficiency. The drum features a hot-dip galvanized anti-corrosion coating, making it suitable for handling moist biomass raw materials.

Main Parts

1.Galvanized Drum Body (Core Component)

The drum body is hot-dip galvanized for corrosion resistance and installed at an incline; internal lifting flights ensure continuous tumbling and cascading of the material. It features a modular screen design allowing for aperture adjustments based on requirements and facilitating easy maintenance and replacement. An optional internal comb-style cleaning mechanism is available to clear wood fibers stuck in the screen mesh in real-time, reducing the risk of clogging.

2.Drive and Transmission Mechanism

Powered by a motor and hardened-gear reducer, the drum rotates at low speed via friction drive from support rollers. Variable frequency drive (VFD) is optional, allowing for speed adjustment to control material retention time and accommodate different raw materials and throughput requirements. Overload protection is included to automatically shut down the machine if a large, hard object causes a jam.

3.Heavy-Duty Frame Base

Constructed from welded heavy-gauge structural steel, the frame supports the drum via load-bearing roller assemblies, ensuring stable operation. The unit is designed for floor-level installation, eliminating the need for a foundation pit.

4.Enclosed Dust-Proof Housing and Dust Extraction Port

A fully enclosed housing with a dedicated dust extraction port suppresses airborne dust during the screening process. Side-mounted access doors and inspection ports allow for easy monitoring of screening status and screen replacement.

5.Multi-Outlet Collection Hopper

Equipped with two discharge outlets: one for qualified fine material (undersize) to be conveyed to a storage silo or dryer, and another for large impurities (oversize)—such as wood blocks and large fragments—to be discharged and returned to the crusher for reprocessing.

Parameter

What Are The Application Areas?

1.Biomass Pellet Fuel Production Line

Serves as pre-treatment screening equipment following the crushing stage. Wood chips, shavings, bamboo scraps, and bark fragments from the crusher are fed into the rotary screen; qualified fine material is conveyed to storage bins for pelletizing, while large wood chunks, unbroken logs, and hard impurities are discharged from the tail end and returned to the crusher for secondary processing.

2.Wood Processing Industry

Used in board factories, furniture plants, wood chip processing facilities, and wood flour plants. It classifies wood chips, sawdust, and shavings, separating out large wood pieces, bark, and debris like sand or stones. It screens for uniform wood flour specifications suitable for engineered wood panels and further processing. The galvanized drum withstands the humid environment of workshops handling damp wood waste, extending service life.

3.Organic Fertilizer / Bio-organic Fertilizer Production Line

Classifies decomposed bacterial residue, composted straw, livestock manure, and garden humus. It screens out stones, plastics, and large undecomposed clumps to yield organic fertilizer raw materials with uniform particle size for the granulation process.

4.Straw Resource Utilization Projects

Used in straw briquetting, straw feed pelletizing, and straw biomass fuel projects. It screens crushed straw material to remove long straw segments, fibrous strands, soil, and stones, ensuring the stable operation of downstream briquetting or pelletizing processes.

5.Landscaping and Solid Waste Resource Recovery

Sorts shredded material from garden branches, landscaping waste, and pruned deadwood. It separates soil, stones, and long branches, screening out uniform fragments for use as biomass fuel or mulching substrate.

6.Other Supporting Applications

Classification and impurity removal for processing lines handling sugarcane bagasse and fruit shell raw materials;

Screening of small-scale sand, gravel, and ore (carbon steel wear-resistant drums are preferred; galvanized models are not recommended due to the high abrasiveness of sand and stone).

Features

1.Embedded steel plate. Before installation, the steel plate should be embedded according to the requirements of the equipment installation drawing, and the upper plane of the embedded steel plate should be on the same plane.  2.Determine the installation location. Installation of screen body. The installation position of the screen body is determined according to the position arrangement of the inlet and outlet of the equipment.

3.Install the base support. The two ends of the screen body are installed on the foundation support by hoisting, and the installation Angle of the screen body is adjusted to the design Angle, and then fixed welding is performed.

4. Connect the feed port and discharge port.

5. Connect the sealing plate of the lower support of the screen body.

6. Check installation.rotate the drum sieve cylinder by hand, there should be no excessive resistance or stuck phenomenon, otherwise it should be adjusted in time to find out the cause.

7. Lubricating injection.After the drum screen leaves the factory, if it is installed for more than 6 months, the bearing of the large shaft must be removed and cleaned before installation.

Details

Model Selection Key Points

Material enters an inclined, rotating galvanized drum, where it is sorted through the drum's rotation and the action of internal lifting flights; fine material passes through the screen for the next processing stage, while large impurities are discharged from the tail end for re-crushing. When selecting the equipment, consider the following factors:

1.Match the drum diameter and length to the production line's hourly output; higher output requires larger drum specifications.

2.Select the screen aperture based on the particle size of the raw material entering the pellet mill; 4–10 mm apertures are commonly used for biomass pelletizing.

3.For moist sawdust or outdoor operating conditions, prioritize the use of a hot-dip galvanized drum.

4.For fibrous materials prone to clogging the screen, it is recommended to equip the unit with a comb-tooth screen cleaning mechanism.

5.Production line integration: Screened, qualified material can be directly fed via belt or screw conveyors into a galvanized hydraulic storage bin or a twin-auger circulating bin.

Installation Procedure

Brief Installation Procedure: 1.Site Preparation: Clear and level the ground, verify the complete set of components, and prepare installation tools. 2.Frame Positioning and Leveling: Hoist the frame into position, level it, and tighten the anchor bolts to ensure stability. 3.Drum Hoisting: Place the drum onto the support roller assembly, adjust the drum's inclination angle to 3–5°, and eliminate axial drift. 4.Drive Component Installation: Assemble the motor and gearbox; manually rotate the drum to ensure smooth rotation without binding or abnormal noise.

5.Accessory Assembly: Install dust covers and feed/discharge hoppers; connect dust extraction ports; install the optional comb-tooth screen cleaning mechanism.

6.Electrical Wiring: Connect to a 380V power supply; wire the variable frequency drive (VFD) and overload protection; verify correct motor rotation direction.

7.No-Load Test Run: Run the machine idle for 30 minutes; monitor operation, noise levels, and support roller temperature; troubleshoot any issues.

8.Commissioning with Material: Feed a small amount of material, adjust rotation speed, verify proper screening and discharge, tighten all bolts, and put the machine into service.

Exhibition

Certificate

Service

1. We operate our own fully equipped manufacturing facility. 2. Having our own factory enables us to ensure prompt delivery. 3. Dedicated quality control personnel conduct rigorous inspections to guarantee product quality. We offer a one-year warranty (excluding wear-and-tear parts and damage caused by improper operation). 4. 24-hour online service; feel free to contact us at any time. 5. Technical guidance: we recommend the most suitable model based on your production capacity and raw materials.

6. You are welcome to visit our factory for inspections and performance testing.

Before delivery, we arrange for professional follow-up to ensure the accuracy of the goods shipped, and we will always monitor the condition of the goods during transportation. After the customer receives the goods, we provide 24-hour after-sales service, and the goods are covered by a one-year warranty. In addition, we have our own factory and professional technicians to help customers solve technical problems to the greatest extent possible, so you can fully trust our after-sales service.

FAQ

1.What are your strengths?

TONY operate with integrity, offer competitive prices, and provide professional service during the export process.

2.How can I know if you're reliable?

TONY value integrity as the lifeblood of our company. TONY can provide you with the contact information of our other customers so you can verify our credibility. Your order and payment will be securely protected.

3.Do you offer a warranty?

Yes, TONY offer a 100% satisfaction guarantee on all our products. If you are not satisfied with our product quality or service, please feel free to contact us immediately.

4.Where are you located? Can I visit you? Of course, you are welcome to visit TONY factory at any time.

5.What is your delivery time?

Within 15 to 35 days after we confirm your needs.

6.What payment methods do you accept?

T/T, full letter of credit at sight, cash, and Western Union are all accepted. If you have other payment methods, please contact TONY.