Screening Machine

What is a screening machine?

Screening machine is a device that uses sieves to separate materials and remove impurities, adaptable to various material grading scenarios. It operates by vibration, separating powders, granules, and slurries, allowing materials of different sizes to be categorized. You can choose different mesh sizes of sieves to meet various screening requirements, from coarse to fine.

Coarse screening typically uses 4-20 mesh screens to remove large particles; 20-100 mesh screens are suitable for medium particle size grading; and 100-500 mesh screens or even higher can sieve finer powders. The machine's vibration frequency ranges from 800 to 3000 rpm, and the amplitude is self-adjusting, allowing for hourly processing capacities ranging from 100 kg to 20 tons to suit different production volumes.

Types of screening machines

Screening machines are indispensable pretreatment equipment in the production of Chinese medicinal materials and granular preparations. They are mainly used to remove impurities (such as sand, fiber, powder) in raw materials and grade them according to particle size to ensure the quality of finished products. The following are common types:

Features of screening machines

Screening machines can classify materials based on particle size, shape, and density. They can handle dry or wet, light or heavy, fragile or sticky materials with minimal risk of breakage or clogging, preserving material integrity and reducing waste. They can process materials continuously, and adjusting the vibration amplitude and screen angle can improve screening efficiency. Following set standards, they can quickly separate materials, processing large quantities in a short time and increasing production speed. They can separate materials into different specifications based on particle size, shape, and density. Screening methods include vibration, rotation, and airflow, selectable according to material characteristics. With fewer parts and fewer malfunctions, the equipment reduces maintenance costs and downtime, and can adapt to granular, powdery, and flaky materials.

Video of screening machine

Technical parameters of screening machine

What is the working principle of the screening machine?

Screening machines usually use vibration, rotation, shaking and other methods to make the material move on the screen surface, and divide the material into different particle size levels or types according to the size of the screen hole. Materials larger than the screen hole size are left on the screen surface, while materials smaller than the screen hole size fall through the screen hole, thereby realizing the screening and separation of materials.

The structure and composition of the screening machine

The screening machine is supported by a frame with sufficient strength and stability to ensure normal operation. The drive unit provides power, commonly using a motor to drive an eccentric block to generate vibration, or hydraulic or pneumatic drives. The screen box holds and supports the screen mesh, typically with a multi-layered structure to achieve multi-stage material grading. Feeding and discharging devices ensure the material is evenly delivered to the screen surface, and materials of different sizes are discharged separately. Support and vibration damping devices often use springs or rubber shock absorbers, which both support the screen box and reduce the impact of vibration on the surrounding environment.

Recommended mesh number of screening machine

Applicable materials for screening machines

Screening machines can process materials by particle size separation, impurity removal, grading, and dehydration, and are adaptable to various material forms. Powdered materials include resin powder, paint powder, flour, starch, cement, lime powder, PVC powder, PE powder, and various fine mineral powders. Granular materials include plastic granules, rubber granules, rice, beans, catalyst granules, gravel, crushed stone, and animal feed pellets. Slurries and liquids can also be processed, such as separating solid particles from paint coatings, removing fibers and impurities from fruit and vegetable juices, and performing solid-liquid separation after chemical reactions.

Application of screening machine

Screening machines separate mixed materials by size and shape. In mining, crushed ore is graded using sieves with different mesh sizes for easier subsequent processing; quarries also use them to sift out stones and sand of different sizes. In agriculture, they remove weeds and sand from grains and separate seeds and feed by particle size. In recycling, they sift through construction waste, household waste, and waste plastics for easy reuse. In the food industry, flour, milk powder, rice, spices, and other products are sieved to remove lumps and impurities, ensuring more consistent quality. In pharmaceuticals, raw materials and pill granules are also sieved to control particle size and ensure consistent drug quality.

Screening Machine Price

Small, manual or simple screening machines, suitable for laboratory or small-batch production, typically cost between $1,000 and $3,000. Standard industrial-grade vibrating screens or drum screens offer basic automation and moderate processing capacity, priced roughly between $3,000 and $8,000. Large, fully automated, high-precision, or customized screening systems, such as large linear vibrating screens, probability screens, or air classifiers for mining or fine chemicals, can start at $10,000. Note that stainless steel is more expensive than carbon steel; your specific process requirements should be clearly defined before requesting a quote.

Screening machine manufacturers

DaHan Vibration Machinery manufactures both standard and custom-designed screening machines, such as extended discharge ports, wheels for easy movement, and horn-shaped feed inlets. With years of experience, the manufacturer is committed to providing users with convenient, one-stop screening machinery selection and maintenance services.

Screening machines are very important separation equipment in industrial production, involving almost all industries that require solid particle separation or solid impurity removal in liquids. Different types and specifications of screening machines can be selected according to different material characteristics and process requirements.