Vibrating screen is a kind of vibration screening mechanical equipment suitable for dry screening of hard - to - screen materials that are wet and fine-grained. It is currently a domestic vibration screening mechanical equipment for processing hard - to - screen materials. At the same time, vibrating screen is a screening machine widely used in industrial and mining enterprises, which is used for screening, grading, washing, de -medium and dehydration of materials.
The technical level and quality of screening equipment are related to the process effect, production efficiency and energy saving, thus directly affecting the economic benefits of enterprises. Vibrating screen has an absolute advantage in all screening equipment due to its simple structure, large processing capacity and reliable operation, and occupies about 95% of screening equipment.
Working Principle of Vibrating Screen
Crushed and scattered material groups with different particle sizes are passed through a single-layer or multi-layer screen surface with evenly distributed holes for a plurality of times and are divided into a plurality of different grades. Particles larger than the mesh are left on the screen surface, which is called the oversize of the screen surface. Particles smaller than the mesh pass through the mesh and are called undersize of the screen surface.
Screening: dividing particles and powder into particle segments with different sizes; Multi - layer screen can be used at the same time to continuously divide them into multiple grades and control a narrow range of particle size.
Screen out impurities: high - performance screening machine can quickly remove large or small particles with low percentage content during high-flow treatment.
Separation of slurry and slag: the insoluble solid substances in various slurries can be quickly removed and slag can be continuously discharged. Most of them can be used in single layer or multiple layers.
Advantages of Vibrating Screen
1. Due to the strong vibration of the screen box, the phenomenon that materials block the screen holes is reduced, so that the screen has higher screening efficiency and productivity;
2. The structure is simple and it is convenient to disassemble and change the screen surface.
3. Less electric energy consumed by screening each ton of materials.
Application of Vibrating Screen in Powder Industry
Vibrating screens are widely used in classification operations in mining, chemical industry, papermaking, medicine, food, coal, metallurgy, cement, ceramics, grain and other industries due to their excellent characteristics.
After the ore is crushed and ground, the useful minerals and gangue minerals are separated by different methods, so that the minerals are separated from each other as much as possible, and impurities are removed or reduced to obtain the required raw materials. After the ore is crushed, a beneficiation vibrating screen is needed to screen impurities in the ore to obtain purer useful ore. After the final product is manufactured, further screening and impurity removal are needed, and a beneficiation vibrating screen is also needed in this link.
Representative minerals: lime, fluorescent powder, kaolin, porcelain clay, clay, talcum powder, etc.
2. Chemical industry
Vibrating screens used in the chemical industry are fully enclosed, free of dust spillage, capable of continuous operation, with high screening accuracy, high efficiency and high screening utilization rate. In addition, they also have a series of advantages such as small volume, light weight, quick start-up and low noise.
Representative substances: resin, paint, pigment, rubber, carbon black, activated carbon, cosolvent, rubber powder, anhydrous sodium sulfate, polyethylene powder, light calcium carbonate, chemical fertilizer, etc.
3. Paper making
In the paper-making process, it is necessary to ensure the uniformity of material particle size and has high requirements on the whiteness of paper. Vibrating screens are needed in the processing of paper-making fillers, paper-making media and paper-making coatings.
Representative materials: slurry calcium carbonate, slurry titanium dioxide, starch, etc.
In the pharmaceutical manufacturing process, the particle size of the raw materials is not uniform after being crushed, and the raw materials can be mixed only after being screened, including the raw materials, the particles planted in the production process and the filtration and screening of the finished products. The screening equipment used in this process is a vibrating screen.
Representative Medicine: Traditional Chinese Medicine
For starch or rice flour and other powders, the first step is to remove impurities from the raw materials - screening - weighing, followed by soaking - rough grinding - germ separation - fine grinding - starch screening - protein separation - centrifugal dehydration - constant temperature drying, and finally weighing - subpackaging the finished products.
Representative foods: sugar powder, starch, salt, rice flour, milk powder, soybean milk, egg powder, soy sauce, fruit juice, papaya powder, green tea powder, Pueraria powder, and potato reprocessing.
Screening plays a role in sorting, grading, desliming, dewatering and media removal. The technical level and quality of screening equipment are related to the process effect, production efficiency and energy saving, thus directly affecting the economic benefits of enterprises.
The development of industry requires more and more varieties and quality of vibrating screens, thus raising the development of vibrating screening machines to a new stage. At present, the screening machines with backward structure and performance of vibrating screen products still account for a large part of all vibrating screen products. Therefore, in the future, priority should be given to the development of large quantity and wide range of excellent mechanical models; exploring new screening theories and developing new screening machines; development of large, heavy and extra-heavy screening equipment to restrict production of old products with low production efficiency and outdated design and phase them out.