Factors affecting the vibrating screen of sand and gravel equipment
1. The influence of material properties. The fact shows that the particles of the circular vibrating screen material whose particle size is less than 3/4 of the screen hole size are easy to steal through the screen hole, which is called easy sieve particle. Particles larger than 3/4 of the sieve hole are called difficult to sieve due to the difficulty of passing through the sieve hole. The particle size of the material is 1-1.5 times the size of the sieve is called the barrier particle. The auxiliary screening method can be increased. A auxiliary screen with a larger mesh size is used to pre-discharge the coarse product on the screen, and then screen the finer materials containing a large number of fine levels.
There is no clear regulation on the certain proportional relationship between the allowable size of material particles and the size of the sieve hole. Cement vibrating screens generally believe that large particles should not be larger than 2.5-4 times the size of the sieve hole. The surface moisture contained in the material increases to a certain extent, and the stickiness also increases. The surface moisture of the material can make the fine particles adhere to each other into a cluster, and will block the sieve holes by attaching to the large particles. These reasons make the screening process more difficult, and the screening efficiency will be greatly reduced.
If the material contains viscous substances (such as clay, etc.) that are easy to agglomerate, even when there is little moisture, it will stick to agglomerates, mixing the fine mud into the product on the sieve; it will also quickly block the sieve holes. At this time, pre-washing should be considered. If the shape of the material particles is round, it is easier to pass through square holes and round holes. Most of the crushed products of the electromagnetic vibrating screen are polygonal. It is not as easy to pass through square holes and round holes as through rectangular holes. Strip, plate, and sheet materials are difficult to pass through square holes and round holes, but easily pass through rectangular holes. .
2. The influence of the working parameters of the screening machine. There are mainly the following six influencing factors.
① Types of dried noodles. The working surface of the sieve usually has steel rods, steel wires, punched steel plates, rubber, polyurethane, etc. Their influence on screening efficiency is mainly related to their effective area. In addition, the degree of wear resistance of various materials is also different.
②The shape of the mesh. The square or rectangular sieve should be used well.
③Sieve hole size. Should contact the work of the crusher and the requirements of the product to choose.
④The movement of the sieve. The screening efficiency of various screens is roughly as follows: high-efficiency heavy-duty screens are greater than 90%; shaking screens are greater than 70-80%; rotary drum screens are 60%; fixed strips are dried 50-60%. Choose according to the situation.
⑤The width and length of the sieve. It is generally believed that the ratio of the width to the length of the sieve is 1:2.5~1:3.
⑥The inclination of the drying surface. The inclination angle of the vibrating screen is generally 0°-20°, and the inclination angle of the fixed bar screen is 40°-50°.
3. The influence of operating factors. In order to maintain a high screening efficiency, the feed should be uniform and continuous, and the feed volume of the vibrating screen should be moderate.
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