Large Non-rotating Drum Screen

The large non-axial drum screen is a cylindrical screening equipment without a central transmission shaft, which is driven to rotate by external idlers or sprockets. It is mainly used for the classification screening of loose materials such as sand and gravel aggregates, construction waste, biomass fuel, household garbage, and mine ores. Compared with traditional shafted drum screens, the shaftless structure eliminates the entanglement and obstruction of the central shaft on the materials, resulting in a higher processing capacity, lower chance of blockage, and easier maintenance. It is the core unit of large-scale screening production lines.

No central axis, completely eliminating entanglement: This is the core advantage of the non-axis drum screen. After the central axis is removed, the materials freely roll within the drum, and long-shaped materials (branches, steel bar ends, plastic films, fabrics) will not be caught by the shaft. The continuous screening performance is significantly improved, and the downtime due to faults is reduced by more than 70%.
Large processing capacity, high single-machine production capacity: The diameter of large non-axis drum screens can reach 3 meters and the length 10 meters. The effective screening area is large, and the materials roll fully. The single-machine processing capacity can easily exceed 300 t/h. One line only needs one machine to meet the grading requirements of a 10,000-ton-per-day sand and stone line.
High screening efficiency, precise classification: The materials continuously roll and fall within the drum, and fine materials fully pass through the sieve holes, while coarse materials are discharged from the end. The screening efficiency is usually 90% to 95%, higher than that of vibrating screens (affected by amplitude and material viscosity).
Flexible customization: The shape of the sieve holes, aperture size, drum length, inclination angle, and driving method can all be customized according to the material characteristics and production requirements; it can also be made mobile (mounted on a track or tire chassis), which is convenient for relocation.

Feed: The materials are fed into the drum from one end through a belt conveyor or chute. A guide plate is installed at the inlet to ensure the uniform distribution of the materials.
Rotary rolling: The drive system (motor + reducer) drives the drum to rotate at a speed of 8 to 15 r/min through the idler rollers or sprocket chains. The drum axis is inclined at 3° to 6° to the horizontal plane. Under the combined action of friction, centrifugal force and gravity, the materials roll forward along the spiral trajectory on the drum wall towards the outlet.
Screening and classification: During the rolling process, the fine materials smaller than the sieve holes pass through the sieve holes and fall into the collecting hopper or belt conveyor below; the coarse materials larger than the sieve holes continue to move forward and eventually exit from the other end of the drum. Different particle sizes of materials can be achieved through multiple levels of classification by setting sieve sections with different aperture sizes (for example, 30 mm at the front end and 60 mm at the rear end, which can separate three particle sizes).
Cleaning and prevention of blockage: To prevent the sieve holes from getting blocked, some models install rotating brushes or high-pressure spray pipes on the outer side of the drum to continuously clean the sieve surface; or chains or rubber scrapers can be set inside the drum to strike the sieve net as it rotates, shaking off the adhered materials.
Discharge: The materials at each level are sent to the next process or storage area by the discharge belt conveyor or chute.

Sand and gravel aggregate production line: Primary screening or classification of limestone, granite, basalt and other minerals. Large non-axial drum screens are usually placed after coarse crushing and before medium and fine crushing, to pre-screen out qualified particle sizes and reduce the burden on the crusher.
Construction waste resource utilization: Screening and classification of construction waste (debris, concrete blocks, bricks, soil). The non-axial structure is not afraid of being tangled by steel bars and wood blocks, and is a standard equipment for construction waste treatment lines.
Biomass power generation fuel preparation: Screening of biomass fuels such as straw, bark, palm shells, and waste wood. Removing fine powder and impurities to ensure uniform fuel particle size and improve combustion efficiency.
Domestic waste sorting: Drum screening of mixed domestic waste, separating organic matter, plastics, paper, metals, etc. by particle size, providing conditions for subsequent air separation and magnetic separation. The non-axial structure can effectively handle tangled items such as plastic bags and fabric strips.

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