Materials Influence the Efficiency of Vibrating Screen

Enrichment phenomenon always happens in the production process of vibrating screen, that is to say, the screening mesh is blocked, the effective screening area becomes smaller, or the working efficiency becomes lower. Those are mainly caused by the type and size of feeding materials, the density, particle size, and particle composition of materials.

(1) The physical properties of materials will be different if the type of materials and particulate material are different, The types of materials can be divided into two categories : brittle and viscous. Viscous material is easy to form material's dense adhesions to plug the screen in the process of screen, so that the permeability decreased. But brittle materials are on the contrary, and the efficiency of the process can be guaranteed. The particle shape of the material will also affect its permeability screening rate. The cubic shape and the ball-shaped materials are easy to go through the screen, while the sheet material is easily stuck in the mesh so that the screening efficiency of the process is reduced.

(2) Material particles are substantially in accordance with the stratified and permeable sieve of the size of the particle volume, i.e. the bulk density of the material directly affects the vibration sieve processing capability. Bulk density bulk materials go easily through the sieve, so the screening efficiency is also higher; on the contrary, it is not easy to loosen less dense materials and powder materials through the sieve screening, so the efficiency is low.

(3) Material moisture content is too high, so they are easy to adhere during vibration. Physical block pressed against each other adhesions group to increase the resistance of the material movement, so that the material particles layered with transparent screen difficulties; materials adhesions also make smaller mesh size, clogged sieve, reducing the effective screening area, sometimes even unable to carry out the screening. Therefore, when the material moisture content is too high, the screening process should consider some remedies, such as to take such measures like drying material.

 (4) The vibrating frequency is influenced by many factors in the process of screen. The most direct and most important factor is the relative size between granularity and sieve mesh. The ratio of material particle size and the mesh size is called the relative granularity. The smaller the relative particle size, the higher the probability of the materials to go through the screen. When the relative particle size is close to 1, the probability of through the screen approaches to zero. Usually relative material particle size equal to 0.7-1.0 called difficult materials or critical materials. Difficult sieve materials also affect the probability of material ingredients through the sieve. The greater the content of the material in difficult materials through the sieve, smaller the probability, so screening efficiency will be lower. In order to be able to get a higher screening efficiency, we should try to reduce the content of material in difficult materials. In addition, the particle size index differences have a certain impact on the screening efficiency. When the particle index difference is too large, it will result in the production cycle. Therefore, the aggregate gradation should be strictly controlled.