Centrifugal sifter

Types of centrifugal sifter

A centrifugal sifter is a machine that separates materials into different components according to their particle size or other characteristics. There are several types of centrifuge used for sifting, which work differently from each other.

• Cone sifter: A cone sifter has a conical mesh element, which sits within a rotary drum. Materials are fed into the drum's top, where heavier particles fall to the periphery and lighter ones pass through the mesh. The separators' compact size makes them suitable for small-scale use. Their limitations stem from their low capacity and simple action, which make them unsuitable for large industries.
• Horizontal sifter: The mesh screen is placed horizontally in this type of sifter, which is also called a centrifuge or drum filter. Materials are continuously fed into the centrifuge drum, where denser components travel through the screen and remain in the filtrate, while lighter ones pass through the mesh. Horizontal centrifugal sifters have a higher capacity than cone models, making them suitable for industrial use. Their complexity increases their maintenance demands.
• Rotating drum sifter: In this typically horizontal machine, a screen mesh cylinder turns. Coarse material moves along the drum's length while fine particles fall through the mesh, separating the two. Rotating drum sifters are suitable for continuous processes.
• Vibro Sifter Machines: Also called vibro classifiers or vibratory screens, these centrifuges have a vibrating base that shakes mesh screens placed on it. Materials are fed onto the screens, where different-sized particles fall through the mesh and are collected. Vibro sifter machines suit high-capacity batch processes. Their efficiency and versatility make them popular.

Specifications and maintenance of centrifugal sifter

Specifications

• Materials

  Centrifugal sifter machines are made of many materials, including cast iron, stainless steel, aluminum metal, carbon steel, PVC, and others. There will be an options list upon purchase to choose the right material for specific needs.

• Product dimension

  Centrifugal sifter suppliers provide different product dimensions according to the specific industry application. The common length and diameter range is from 200mm/ 300mm/ 400mm up to 3000mm, while the length ranges from 1000mm to 4500mm.

• Active Screen Area

  Centrifugal sifter has various active screen areas available depending on the model. For a small model such as the 200mm sifter, the active screen area may be 0.03 m2, while for larger models with more screeners, the area can go as high as 11.3 m2.

• Flow Rate

  The flow rate varies in different machines. For an approximate reference, a single-deck 400mm x 1500 mm centrifugal sifter can achieve a flow rate of 2400 kg/hr.

• Speed

  A centrifugal sifter machine can typically reach 3000 RPM, allowing it to deliver efficient product output.

• Power

  The power of the centrifugal sifter ranges up from 0.75kW to 5.5kW, and the motor type mainly includes 3-phase induction and VFD control.

• Filtration effect

  Centrifugal sifter machines can achieve a filtration efficiency or accuracy of up to 98% to 99%, removing most impurities and fine particles from the material being screened.

Maintenance

• Clean regularly

  CLEANING: Remove any bulk goods in the base and barrel and use cleaning agents and soft towels to clean the outer surface. Pay attention to cleaning the dirt on the switch, interface, and radiator fan. DO NOT IMMERSE ANY PARTS IN water or any other liquid, and DO NOT spray the body with any chemicals.

• Lubricate pivot points

  No regular lubrication is required for oscillating centrifugal sifter; however, applying a few drops of food-grade lubricant to the pivots occasionally can help.

• Inspect the screen

  Check if the mesh surface is taut and flat. If there are any deviations, phenomena, or damages, repair and replace them immediately. Let the machine screens run for six months longer than the expiration date but do not exceed six months.

Industry Applications

A Centrifugal sifter screen machine is useful in various industries. Here are some ways it is used in application industries.

• Food Processing: In the food processing industry, the centrifugal sifter separates unwanted materials and impurities from flour. It can also be used to classify the food particle sizes when processing cocoa powder, flour, cornmeal, sugar, salt, and other such substances. The sifter achieves the goal of improving food product quality and maximizing yield.
• Astronautics: The space industry uses centrifugal screens to clean the air and separate particles within the spacecraft. Some solid-liquid separation works were even within the astronauts' bodies. The sifter's work helps prevent contamination and protect the health and safety of the astronauts.
• Pharmaceuticals: The pharmaceutical industry relies heavily on the accuracy and precision of the final product when it comes to selecting materials. The pharmaceuticals industry uses the centrifugal sifter to separate impurities from active ingredients and refine drugs like antibiotics, reshaping hormones, and vitamins. One distinct benefit of a pharmaceutical sifter is that it enables the smooth production of tableting and encapsulation processes to enhance the safety and efficacy of the sifted products.
• Chemicals: Various chemicals are essential for the domestic and industrial market. However, when chemicals are made with different raw materials, impurities might be found within the material. A chemical centrifugal sifter will go a long way to eliminate such impurities, ensuring chemical purity.
• Cement and Aggregates: In construction, a task as crucial as material production needs to be free of impurities. Admixtures and unwanted bugs in product lines can cause a lot of problems, especially when looking to produce a solid and durable construction. Luckily, the centrifugal sifter separates oversize particles and contaminants in cement and aggregate materials. It also improves the quality of cement and aggregate construction materials by achieving better particle size distributions.

How to Choose a Centrifugal Sifter

There are different ways to choose a sifter for a project. One good way is to study the materials to be processed and their properties closely. Knowing things like material bulk density will help determine whether a vibrating sifter, an airflow sifter, or a centrifugal sifter is best for handling non-herculean materials.

How fine or coarse does the final particle size need to be? Choosing a sifter that can produce the desired outcome is vital. Some sifting machines are designed to separate particles greater than 150 microns and are not suitable for isolating fine particles. The preferred particle size should be compared with the specifications of the available sifting machines.

It is helpful to investigate the production capacity of the sifter being considered. Will it meet needs now and as the business scales? A complete review of the factors affecting the choice of sifting machines should include the method of sieving. Several sifting machines are available, but the centrifugal sifter is efficient, especially for materials that clump together.

The cost of the sifter comparing its capacity and the sieve required to manage specific materials needs to be considered. Examine the maintenance needs and the ease of cleaning and replacing parts that will be crucial when it comes to downtime.

Finally, look into the manufacturer or supplier's reputation. Seek out those with a track record of robust support and enduring products. With the right inspection and research, a sizable quantity of these machines can be purchased and delivered with confidence.

Centrifugal sifter Q&A

Q1 What are the advantages of a centrifugal sifter?

A1 There are many benefits of using a sifter, some of which are listed above. Centrifugal sifters are essential for removing impurities and ensuring product quality. They enhance the quality of the end product by effectively separating coarse materials and contaminants.

Q2 Do all centrifugal sifters in the market come with dust extraction units?

A2 No. Not all machines come with dust extraction units. Tests must be conducted to evaluate the health risks posed by fine dust. If the analysis shows that there is a significant risk, then a machine with a dust extraction unit should be used.

Q3 How much noise does a centrifugal sifter make?

A3 The machine's noise level might exceed normal ambient noise, but it is still a negligible amount. Its operational efficiency is well above that of other machines, so its noise level is overlooked.

Q4 Do all centrifugal sifter machines in the market have flat screens?

A4 No, they don't. The machines have either a round or flat configuration. Round centrifugal sifters are better for processes that require a large throughput of product. On the other hand, flat machines are more suited for higher feed concentrations of dry material.