12 reasons for unsatisfactory screening effect of vibrating screen
1, The screen hole is blocked, which is the common cause of poor screening quality of the vibrating screen. At this time, it is necessary to reduce the combination of the vibrating screen and clean the screen surface to solve the problem of screen hole blockage.
2, The water content of the material entering the sieve increases. Generally, the water content of the material entering the sieve has certain requirements. Too much water content will easily cause the material to bond and agglomerate, and it is not easy to pass the sieve. If there is too much water in the material, what should we do to achieve the screening effect? The small editor teaches you a way to change the inclination angle of the screen box and increase the inclination angle to improve the problem of poor screening quality
3, The uneven feeding of the vibrating screen will not only cause the accumulation and breakage of the material but also greatly reduce production efficiency. Excessive accumulation of material will easily lead to poor screening quality and even lead to equipment operation failure. Therefore, the feeding of the screen machine should be adjusted to ensure uniform feeding.
4, The feeding layer on the screen surface of the vibrating screen is too thick. The feeding layer is too thick to fully screen the materials during screening, and the screening efficiency is greatly reduced, resulting in poor screening quality. The feeding of the screening machine should be reduced.
5, The screen is not tight, and the drive belt is too loose. Both of the above conditions can easily lead to an unsatisfactory screening effect, which is not conducive to the normal operation of screening and thus affects the screening quality of the vibrating screen. In this case, the screen should be tensioned, and the drive belt should be tensioned.
6, Particle size: When the particle size is close to the size of the vibrating screen, the screening efficiency is significantly reduced. The total screening efficiency decreases significantly with the increase in the proportion of particles near the mesh. The role of near-sieve particles is multifaceted because these particles tend to limit or block the sieve hole so that the effective screening area of the sieve is reduced. This is the process that often occurs in the screen in the closed circuit crushing process. In the closed circuit crushing process, the material entering the screen hole gradually increases, which gradually reduces the screening efficiency of the vibrating screen.
7, Feeding speed: the analysis principle of screening particle size is that using a lower feeding speed and longer screening time can achieve almost complete separation. In screening practice, considering the economic cost, it is required to adopt a higher feed rate and reduce the residence time of materials on the screen surface. At a higher feed rate, a thick bed is formed on the screen surface, and the fine particles must pass through the thick bed before they can pass through the screen surface further. The final result is to reduce the screening efficiency of the vibrating screen. For any separation operation, high yield and high efficiency are often two contradictory requirements. In order to obtain good results, the above two indicators must be considered comprehensively.
8, Screen inclination: if the particles approach the sieve hole of the vibrating screen at a small inclination, the screen "looks" as the effective aperture of the next stage, and the particles near the sieve hole can hardly pass. The inclination angle of the screen surface affects the angle of particles entering the screen hole. Some sieves use this function to separate materials finer than the screen hole. The screen angle also affects the speed of particles moving along the screen surface, the residence time on the vibrating screen surface, and the probability of particles passing through the screen surface.
9, Particle shape: Most of the material particles processed by the vibrating screen are non-spherical. When the spherical particles pass with equal probability in all directions, the irregularly shaped particles near the sieve must pass through the sieve in a certain direction. Slender particles and plate-like particles have a smaller cross-sectional area in one direction and a larger cross-sectional area in other directions. Therefore, the screening efficiency of particles with extremely irregular shapes is reduced.
10, Effective screening area: the probability of passing the screening is proportional to the percentage of the effective screening area of the sieve. The effective screening area refers to the ratio of the mesh area to the total area of the screen surface. The smaller the screen surface occupied by the screen material, the greater the probability of particles entering the screen hole. The effective screening area decreases with the decrease of the mesh size. Therefore, in order to increase the effective area of the small-hole sieve diameter, it is necessary to use a fine and brittle screen line, but its screen is easy to wear and the processing capacity is low, which is also the reason why fine materials are classified by a classifier instead of a fine screen.
11, Vibration: In order to make the material throw away from the screen surface of the vibrating screen, the screen should be vibrating, and the vibration makes the material fall back to the screen surface and move along the screen surface. Proper vibration can also cause the layering of the feed, which makes the fine particles pass through the material layer and reach the screen surface downward, and then make the large particles rise to the top. Stratification can increase the passing rate of the middle part of the sieve.
12, Moisture: the surface moisture content of the feed has a significant impact on the screening efficiency, which is the same as clay and other cohesive materials. It is difficult to screen the wet feed. Do not screen the wet material to prevent clogging the sieve hole. These measures also include the use of thermal coverings to destroy the surface tension of water between the vibrating screen and the material, the use of spherical plates to generate nearby vibration at the lower part of the screen surface or the use of non-blocking screen cloth weaving. The wet screen can effectively screen 250um or even finer particles. The adhered slime can be washed down from the large ore particles, so the slurry flow and washing water can wash the sieve clean.
Applicable industries
Chemical industry: resin powder, pigment, washing powder, micro powder, paint, soda ash, lemon powder, rubber, plastic, etc.
Abrasives, ceramic industry: alumina, quartz sand, mud, sprayed soil particles, etc.
Food industry: sugar, salt, alkali, monosodium glutamate, milk powder, soy milk, yeast, fruit juice, soy sauce, vinegar, etc.
Paper industry: coating paint, clay mud, black and white liquid, waste liquid, papermaking liquid, wastewater recycling, etc.
Metallurgical industry: titanium oxide, zinc oxide, electromagnetic materials, metal powder, electrode powder, etc.
Pharmaceutical industry: Chinese medicine powder, Chinese medicine liquid, Western medicine powder, Western medicine liquid, Chinese and Western medicine granules, etc.
Environmental protection: garbage, human and animal excrement, and urine, waste oil, food wastewater, wastewater processing, etc.
Processing process
Production workshop
This is our inner workhouse.
some small equipment or parts will be made from here.
There are cranes, laser cutting machines, electric welding machines, platen machines, angle grinders, polishing machines, forklifts, and other equipment.
Packaging & Shipping
After you place the order and pay the deposit, we will start to arrange the production and contact the ocean freight transportation agency to reserve the position. Two days before the end of production, you need to complete the final payment. Then, we inform the ocean cargo transportation agent company that it is ready to come to the factory to pull the goods to the port. On the day of delivery, we will send the customer the factory video and pictures, and mark the corresponding English name of each product and product parts with a marker to prevent the customer from not knowing what each part is after receiving the goods. At the same time, we will put the English version of the product instructions in the cargo box. We generally select freight forwarders with preferential prices for customers to deliver goods for you. The shipping method can be FOB or CIF. You can also choose EXW, and then contact the goods agent company yourself.
Customer visit
FAQ
1. Who are we?
Our headquarters is located in Henan, China, and our factory was established in 2002. At present, there are more than 100 workers, technical engineers, foreign trade sales personnel, and administrative personnel. The factory covers an area of more than 2000 square kilometers and is mainly engaged in vibrating screening and conveying and feeding equipment.
2. How do we guarantee quality?
Always provide pre-production samples before mass production; Always carry out a final inspection before shipment.
3. What can you buy from us?
You can purchase a vibrating screen, roller screens, rotary screens, vacuum conveyors, mixer, and customized vibrating machinery and conveying equipment in our factory.
4. What are our strengths?
As one of the old enterprises in the screening industry, Tianfeng has provided a large number of screening equipment and systems at home and abroad. Mass production, rapid delivery, stable quality, affordable price, and excellent after-sales service have become the symbols of Tianfeng.
5. What services can we provide?
Accepted delivery conditions: FOB, CFR, CIF, EXW, CIP, FCA, CPT, DDP, express;
Accepted payment currency: USD, EUR, RMB;
Type of payment accepted: telegraphic transfer, letter of credit, express remittance, credit card, PayPal, Western Union remittance, cash, custody;
Oral: English, Chinese, French.
6. What information do we need to help you choose a perfect machine?
-Name and characteristics of raw materials.
-Purpose of use: remove impurities, filter, and grade.
-Processing capacity: kg/h, L/h.
-Raw material size: (mesh or mm).
-How many floors do you need?
-Voltage, frequency, phase (single-phase or three-phase) Note: You'd better send us the relevant pictures or materials you want to filter, which can ensure that we recommend the appropriate machine for you.
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