Rotary vibration screening equipment also plays a powerful role in feed screening and classification. The so-called classification is to screen the materials into two or more grades and process them according to different needs. The feed industry is mainly used in crushing material classification, granular material classification and material particle size determination. The oversieve is refluxed and crushed, and the undersieve enters the batching bin. According to the information, the sieve size is 1.2mm is more appropriate.
In feed processing, in order to increase the output of the pelletizer and reduce the energy consumption of pelleting, large-diameter die holes are often used for production, and then crushed into small pellets. After the particles are broken, they need to be classified to separate the too fine powder (the unformed powder in the granulation process or the powder produced in the crushing process) and the too coarse particles (the particles that are not sufficiently broken), so that they can enter The particles in the finished product processing section meet the product size requirements. The classification of pellet feed is carried out on a two-layer sieve surface, the upper sieve is refluxed and crushed, the lower sieve is refluxed for granulation, and the middle layer is the finished product. It can be seen that the mesh size of the grading screen directly affects the particle size of the product. The size of the sieve holes used for the classification of products with different particle size specifications, the particle size (mm) of the grading product is 2.40, 3.20, 4.00, 4.75, 6.35, 9.50, 12.7 and crushed particles, and the corresponding sieve size (mm) is 1.65, 2.23 , 2.92, 3.89, 5.21, 8.97, 11.5 and 1.16. It can be seen that in order to control particles of a certain particle size not to pass through the sieve holes, the sieve hole diameter should be smaller than the particle size value.
The grading screen in the typical granulation process is generally fed directly by the bucket elevator. Because the vibrating screen is easy to cause the material to be concentrated in the middle of the screen body, the utilization rate of the screen surface is low, and the local material layer is too thick, which affects the classification effect. A buffer hopper (with a baffle inside) is arranged at the screen feed port to make the feeding process evenly along the width of the screen surface.