Peneira giratória VS Peneira vibratória, qual é a melhor?

Introdução: No domínio do tratamento de minerais, a trommel screens(aka rotary drum screens) e peneiras vibratórias são ambos amplamente utilizados para o rastreio & equipamento de classificação. But what’s the difference between the trommel screens and vibrating screens, and how to choose the most suitable screens for your mineral processing application? Or even how should we choose the right screening equipment for specific mining conditions? 

 

Is The Trommel Screen Better Than The Vibrating Screen?

Though we all may know that they are both widely used screening equipment, the different working methods and principles also mean the difference in output, as well as the types of materials suitable for screening processing. So in this article, we will help you analyze the difference between the trommel screen and the vibrating screen from the following 7 aspects. And this comprehensive comparison will help you make an informed decision.

 

The Difference Between Trommel Screen and Vibrating Screen

1. Different Screening Methods

Vibrating screens and trommel screens are both screening equipment, but the two work using different screening methods:

Peneiras vibratórias são crivados através da força de excitação gerada por um motor vibratório e pertencem aos crivos vibratórios. Os crivos vibratórios para minas habitualmente utilizados são os crivos vibratórios circulares e os crivos lineares.

O ecrã trommel is another screening form. During the screening process, the equipment will not vibrate, but generally, the motor and reducer drive the drum to rotate through the bearing. The material in the drum passes through the screen from high to low due to the rotation of the drum. It is successfully screened out, so the trommel screen belongs to a type of rolling screening.

2. Different Shapes and Structure

Os dois são muito diferentes na aparência e podem ser facilmente distinguidos.

Peneira giratória: It is a cylinder. The outer surface of the cylinder uses one or more layers, or several sections of screens to increase the screening specifications. The volume of the trommel screen is generally large, mainly including motors, reducers, drum devices, screens, and machines. It is composed of a frame, a sealing cover, and an inlet and an outlet. A steel ring must be added to the drum device to prevent the trommel screen from deforming.

 

 

Peneira vibratória: The vibrating screen is mainly composed of a screen box, a screen frame, a screen mesh, a vibrating motor, a motor base, a vibration-damping spring, and a bracket.

• Linear vibrating screen: Two vibrating motors are installed at the bottom of the equipment, which can be divided into several layers.
• Circular vibrating screen: also known as a single-shaft vibrating screen, its support methods include suspension support and seat support.

The trommel and vibrating screen are generally composed of a woven screen or a punched screen, and the screen size is generally 6-8 mm.

3. The Working Principle is Different

• Peneira Trommel

The roller device is installed on the frame obliquely. The motor is connected with the roller device through a coupling and a reducer, and drives the roller device to rotate around its axis. When the material enters the drum device, due to the tilt and rotation of the drum device, the material on the screen surface is turned and rolled. The qualified materials (products under the screen) are discharged through the outlet at the bottom of the rear end of the drum, and the unqualified materials (on the screen) are discharged through the discharge port at the end of the drum.

• Linear Vibrating Screen

Utilizando o motor de vibração como fonte de vibração, o material é atirado para o ecrã enquanto avança em linha reta. O material entra na entrada da máquina de crivagem uniformemente a partir do alimentador, e produz vários tipos de ecrãs através do ecrã multicamada. Os objectos superiores e inferiores são descarregados das respectivas saídas.

 

• Peneira vibratória circular

The screen surface is fixed on the screen box, and the screen box is suspended or supported by springs. The bearing of the main shaft is installed on the screen box and is driven by the pulley to rotate at high speed. The eccentric counterweight plate is installed on the main shaft and generates a centrifugal inertia force with the rotation of the main shaft, so that the screen box forms an approximate circular orbit vibration.

4.

4. Different Classification

O ecrã trommel can be divided into single-layer, double-layer, and three-layer vibrating screens according to the number of layers of the screen. This vibrating screen is also similar; according to the number of screen surface layers can be divided into single-layer, double-layer, three-layer, and four-layer vibrating screens.

According to whether the trommel motor is connected to the bearing, it can be divided into shaft trommel e shaftless trommel.

According to the different trajectories of the screen surface of the vibrating screen, it can be divided into circular vibrating screens e peneiras vibratórias lineares, which have been introduced above.

5. Different Output and Applicable Occasions

The trommel screen has a large output and long life, which is suitable for large output requirements.

The linear vibrating screen has a small output and is suitable for screening fine materials.

The circular vibrating screen has a large output, which is suitable for large-scale production lines.

Due to the different screening methods of the vibrating screen and trommel screen, the materials they are good at screening are also different:

1. No caso de muitas pedras e pedras grandes, o material com maior viscosidade será mais eficaz porque o crivo vibratório está a vibrar.
2. O peneiramento de poeiras e pequenas partículas é o ponto fraco do crivo vibratório. O efeito de peneiramento do crivo giratório será melhor.
3. Para o peneiramento de materiais secos, a peneira vibratória não é fácil de bloquear buracos, e o efeito de peneiramento é melhor.

6. Different Screening Accuracy

O crivo vibratório é um equipamento de crivagem com um motor vibratório como fonte de vibração, pelo que a precisão da crivagem é elevada. O trommel é um equipamento de peneiramento de alto rendimento, e a precisão do peneiramento não é tão alta quanto a tela vibratória.

7. Different Blocking Conditions

For the trommel screen, the material is turned over and rolled in the drum, so that the material stuck in the sieve hole can be ejected to prevent the sieve hole from being blocked. For the circular vibrating screen, the material moves in a parabolic circular trajectory on the screen surface, so that the material is dispersed as much as possible to improve the material’s bounce force, and the material stuck in the screen hole can also jump out, reducing the hole-blocking phenomenon.

Conclusão

Vibrating screens and trommel screens have their own working methods and screening principles. Some raw materials can be screened through them. However, for different sites and different material requirements, suitable screening machines should be selected to achieve better screening results. 

Industry Expert Recommendation

For optimal mineral processing results, consider that trommel screens generally outperform vibrating screens in high-capacity operations with challenging materials, while vibrating screens excel in precision applications requiring multiple product fractions.

Hybrid solutions incorporating both technologies often deliver the best overall performance for complex mineral processing circuits. Modern designs now offer modular systems that combine the high capacity of trommels with the precision separation of vibratory screens in multi-stage arrangements.