What is Trommel Screen and How Does It Work

What is Trommel Screen

Trommel screen, or rotary screen, is a kind of mechanical screening machine which is widely used in the separation operation. It controls the material separation by the particle size, and the separation precision is high. The cylinder of the trommel screen is generally divided into several sections, depending on the specific situation. The mesh holes are arranged from small to large, and the mesh hole diameter on each section is the same.

trommel screens

Trommel screens are widely used for wood chips, soil, compost, solid waste, domestic waste, ores, rock and aggregates accurate sizing and separation.

Trommel screen is mainly composed of motor, reducer, roller device, frame, sealing cover, inlet and outlet.

How Trommel Screen Work

The cylindrical drum is mounted obliquely on the frame. The motor is coupled to roller device via the reducer and drive the drum rotates around its axis.

When the material enters the drum screen, due to the inclination and rotation of the roller device, the material on the screen surface will turn over and roll, so that the qualified material will be discharged through the outlet at the bottom of the drum, and the unqualified material will be discharged through the outlet at the end of drum.

Due to the overturning and rolling of the material in the drum, the material stuck in the screen hole can be ejected to prevent the screen hole from blocking.

Advantages of Trommel Screen

1. Rolling conveying principle, small friction coefficient, and the screen hole is not easy to be blocked.

2. The roller support adopts the overall through shaft structure, which is stable in operation, free from vibration and low in noise.

3. The internal trommel screen accessories adopt the split design, with simple structure and quick and convenient replacement and maintenance.

4. The roller device adopts an effective fully sealed structure, which is dust free and pollution free.

5. The operation is safe and reliable. The reducer is adopted with high transmission efficiency, small belt power, low energy consumption and obvious energy saving effect.

6. Different screen materials can be used according to the requirements of customers, with high screening efficiency, long service life and low maintenance cost.

7. Special screen is adopted, with high screening efficiency and long service life.

8. The main frame of heavy steel structure is designed with components for minimizing material accumulation.

9. Trunnion components mounted to heavy duty roller bearings to prolong service life.

10. Small installation inclination angle and good screening effect.

Trommel Screen VS Vibrating Screen

screen machine

Screen TypeTrommel ScreenVibrating Screen
Feed MethodMultiple, depending on the actual situationOnly suitable for belts, funnels, fixed size of inlet
Screening MethodRotateVibration
Screening Efficiency> 95%10%-70%, depending on the water quality
Screening Quantity100% MCR, unlimited10%-80% MCR
Mesh Size6-30mm, can be adjusted freelyCannot be arbitrarily adjusted
Energy CostSmall, 50% of other sieve typesBig
NoiseWith sealed enclosure, low noiseHigh
Service L-ifeLongShort
Working EnvironmentGood, there is a sealed isolation coverPoor, unsealed cage

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