O que é peneiramento centrífugo?
Centrifugal sifting is a high-precision screening device used for sieving fine powders. Its technical principle is based on aerodynamics, which uses airflow to move the material. In a closed state, the device disperses and atomizes the material through high-speed airflow. The fine particles of the material are either ejected through the screen by centrifugal force or sucked through the screen holes by negative pressure, achieving classification. Air-flow sieves are mainly divided into vertical and horizontal types and are capable of continuously sieving powder materials with fineness ranging from 80 to 530 mesh, with replaceable screens.
Centrifugal sifting offers high screening efficiency and precision, with screens installed vertically. They have a wide range of applicable material fineness, adopt a fully enclosed structure, have relatively low energy consumption, and support continuous operation. Modern equipment has reduced energy consumption. This device is applied in industries such as chemical engineering, pharmaceuticals, food processing, papermaking, metallurgy, building materials, rubber, machinery, mining, and environmental protection. In the future, the development of centrifugal sifting may involve intelligence, achieving automatic adjustment and fault warning through monitoring and data analysis.
What problems can the centrifugal sifting solve for you?
- Doubling the output: The centrifugal sifting achieves a screening efficiency of over 95%, with high hourly production capacity and large unit processing volume.
- Not easily clogged, fast offline feeding: Based on aerodynamic principles, it can break up material agglomeration, suitable for processing fine powders with small mass, prone to static electricity, moisture, or stickiness.
- Mitigate screen damage: The screen is installed vertically and does not directly bear the weight of the material, which helps extend the screen’s service life. It also features an automatic screen-cleaning function.
- Overcoming traditional maintenance challenges: The equipment has a compact structure, a relatively simple operation process, can achieve continuous operation, and has relatively low maintenance requirements.
Product Features
Centrifugal sifting is equipped with an airflow feeding function, feeder lump crushing function, and airflow coarse sieving function. Its benefits include saving customers the investment and operating and maintenance costs of feeding machines, extending the service life of fine sieving screens by more than 10 times, stably increasing production capacity, reducing power consumption, and improving the quality of the finished powder that passes through the screen.
The principle of the centrifugal sifting
Centrifugal sifting utilizes the characteristics of fine powder particles, which are light in weight, easily float, and have good flowability. They fully disperse the powder into the air stream, preventing particle agglomeration and allowing individual particles to pass through the sieve mesh sequentially with the airflow. The core sieving logic can be summarized as pre-classification followed by sieving. High-speed airflow first thoroughly disperses the powder particles, breaking up agglomerates; subsequently, under the synergistic action of negative pressure and mechanical force, the pre-classified individual particles are selectively adsorbed and pass through the sieve mesh. Therefore, centrifugal sifting typically offers high processing capacity and sieving efficiency. Their design helps reduce material adhesion to the mesh or clogging of sieve holes, resulting in high sieving accuracy.
How does centrifugal sifting separate the powder?
The core of centrifugal sifting is to use air as a carrier and kinetic energy to do work, allowing powder particles to disperse fully and then be jetted through the screen under a closed condition. After the material enters from the feed hopper, it first mixes and atomizes with high-speed airflow. It is then subjected to centrifugal force and cyclone thrust by the wind wheel blades. Fine powder is \”jetted\” through the screen into the collection chamber, while coarse particles move along the screen cylinder wall and are discharged from the slag outlet. The screen is vertically installed in a cylindrical shape and does not bear the weight of the material, resulting in a much longer service life.
Principais componentes
- Feeding and Conveying System: The feeding hopper and screw conveyor are responsible for evenly and quantitatively feeding materials into the main unit. Some models also incorporate the function of breaking up lumps.
- Sifting Host: It is the core part of the centrifugal sifting, with a cylindrical sieve net installed inside the machine.
- Wind wheel and main shaft system: The wind wheel blades installed on the inner side of the screen are driven by an electric motor to rotate rapidly.
- Airflow and Power System: The fan generates a powerful high-speed airflow, providing the power for material conveying and screening.
- Coarse and fine material discharge system: Coarse particles are discharged from the coarse material outlet; the fine powder that passes through the screen is discharged from the fine material outlet.
- Sealing and Observation Device: Fully enclosed structure, ensuring airtight operation throughout the process to prevent dust from flying and overflowing.
What are the advantages of centrifugal sifting?
- Jia Rui air jet sieve achieves a screening efficiency of over 95% and has a high hourly output. The typical screening fineness range of the equipment is 80-500 mesh, and some models can be extended to 10-530 mesh, allowing for screening of powder materials within the corresponding range.
- Jia Rui air flow sieve adopts a fully enclosed negative pressure structure. During the sieving process, dust is less likely to spill out; it operates with relatively low noise and consumes less energy.
- The equipment structure is relatively compact, the operating process is relatively simple, continuous operation can be achieved, and the maintenance requirements are relatively low.
- Its sieve is installed vertically and does not directly bear the weight of the material, which helps extend the sieve’s service life and features an automatic screen-cleaning function.
- This device employs aerodynamic principles to break up material agglomeration and is suitable for processing fine powders with small mass, prone to static electricity, moisture, or stickiness.
Two types of centrifugal sifting
Centrifugal sifting classifiers are divided into two types: horizontal centrifugal sifting and vertical centrifugal sifting, which can be selected according to specific production purposes.
Based on their main structure, centrifugal sifting classifiers are primarily categorized into two major types: vertical and horizontal. The screen of a vertical centrifugal sifter is in the form of a vertical cylinder, with representative models such as the LQS series. The horizontal centrifugal sifter, also known as a cyclone classifier, has a screen in the form of a horizontal cylinder. In addition, there are laboratory airflow classifiers specifically designed for laboratory sieving and analysis. These laboratory models offer high precision and adjustable parameters and are often used in conjunction with vacuum equipment.
Vertical Centrifugal Sifting VS Horizontal Centrifugal Sifting
Centrifugal Sifting can be divided into two types: Vertical Centrifugal Sifting and Horizontal Centrifugal Sifting. What are their differences? Below is our summary of analyzing their distinctions from multiple dimensions:
| Comparison Dimensions | Vertical Centrifugal Sifting | Horizontal Centrifugal Sifting |
| External structure | Vertical cylindrical | Horizontal square, with material discharge downward from the center. |
| Core Features | The wind turbine blades are dense and operate at high wind speeds, resulting in greater output. | It has a relatively simple structure and runs more smoothly. |
| Applicable materials | Suitable for fine powder sieving, requiring that the fine material in the raw material accounts for 90% or more. | Suitable for materials with a large amount of coarse powder. |
| Typical materials | Flour, graphite powder, rubber powder, magnesium oxide, heavy calcium powder, etc. | Materials with high fiber content, strong viscosity, and low specific gravity. |
Technical Parameters
| Parameter Items | Typical numerical value/range | Note |
| Sieve Fineness | 80 – 530 mesh (some can reach 600 mesh) | Sieve meshes can be replaced arbitrarily |
| Efficiency | ≥ 95% | |
| Processing capacity | 60 – 2000 kg/h (varies by model); | Large equipment can reach 15 – 500 t/h |
| Motor Power | 2.2 – 18.5 KW | |
| Spindle Speed | 650 – 1450 rpm |
Industry adaptation
Centrifugal sifting is widely used in industries such as chemical engineering, pharmaceuticals, food processing, papermaking, metallurgy, building materials, rubber, and machinery for continuous screening of powder materials with fineness ranging from 80 to 500 mesh.
- Chemical industry: such as soda ash, polyethylene, resin powder, paint, dyes, pigments, etc.
- Pharmaceutical industry: such as Western medicine powders, traditional Chinese medicine powders, and pharmaceutical intermediates.
- Food industry: such as starch, infant formula, seasonings, fruit juice, oat flour
- Non-metallic industry: such as carbon black, quartz powder, mica, fly ash, etc.
- Metallurgical industry: alloy powders, casting sands, as well as papermaking, building materials, rubber, machinery, and other industries
Common models
Common models of vertical centrifugal sifting:
Common models of horizontal centrifugal sifting:
| Model | Material | Power (kW) | For |
| WQS18-65 / WSA18-65 | Q235A / SUS304 2.2 | 2.2 Sieving | below 500 mesh |
| WQS30-100 / WSA30-100 | Q235A / SUS304 | 4 Sieving | below 500 mesh |
| WQS50-130 / WSA50-130 | Q235A / SUS304 | 5.5 | below 500 mesh |
How to select Centrifugal sifting?
- First, confirm whether the material is suitable for centrifugal sifting by analyzing its particle size, moisture content, viscosity, production capacity, specific gravity, and other aspects. Select the
- Select the type of air jet sieve: vertical air jet sieve and horizontal air jet sieve. The vertical air jet sieve is the preferred choice for most situations, offering high output and thorough sieving (with material rotation and jetting). The horizontal air jet sieve is only used in cases where factory height is limited, or when there is a very low production requirement and only simple grading is needed.
- The centrifugal sifting cannot operate as a standalone unit; it is necessary to confirm that the factory can provide an accompanying fan, pulse, and dust collector. If the material is prone to generating static electricity, anti-static design or explosion-proof motors must be specified.
Conclusão
Centrifugal sifting offers high screening efficiency and precision, with screens installed vertically. They have a wide range of applicable material fineness, adopt a fully enclosed structure, have relatively low energy consumption, and support continuous operation.