The selection of mining vibrating screen surface involves multiple aspects, and the following is a detailed analysis of some key factors:
1、 Sieve size and shape
Sieve size: The sieve size is the key factor determining the size of the screened particles. If the sieve aperture is too large, it will prevent fine-grained substances from passing through the sieve aperture, while if the sieve aperture is too small, it may clog and affect the screening efficiency. The selection of sieve size should be based on the maximum particle size of the material and the required product particle size. In practical applications, the appropriate sieve size should be selected based on the material characteristics and process requirements.
Mesh shape: The mesh shape also has a certain impact on screening efficiency. When the nominal size of the circular sieve is the same, the particle size of the material passing through the sieve is smaller; The rectangular sieve has a large sieve surface area, light sieve surface weight, and high production capacity. At the same time, the particle size of the material passing through the sieve is larger than that passing through circular and square sieve holes with the same nominal size. Therefore, in order to achieve higher screening efficiency, different sieve hole shapes must be selected for different screening materials.
2、 Mesh size and density of sieve mesh
The density of the sieve, also known as the mesh size, refers to the number of sieve holes per inch of the mesh. The higher the mesh size, the smaller the sieve opening, and the smaller the particle size of the material passing through. The selection of screen mesh size should be based on the expected particle size range and screening efficiency requirements of the screened product.
3、 Screen material
Metal mesh: Metal mesh is one of the most commonly used screening materials, widely popular due to its strong wear resistance, high temperature resistance, and simple structure. Common metal mesh screens include stainless steel, low-carbon steel, aluminum alloy, etc. Metal mesh is suitable for screening materials with high hardness, but its corrosion resistance is poor when facing corrosive media.
Polyurethane screen surface: Polyurethane screen surface has good wear resistance and corrosion resistance, suitable for screening materials with high hardness and high corrosiveness, such as certain chemical raw materials and metal ores. The polyurethane screen surface is soft, which can effectively reduce the friction between the material and the screen surface, and reduce the noise and vibration of the vibrating screen.
Special plastic materials: Some screening surfaces made of special plastic materials, such as nylon, polycarbonate, etc., are also commonly used for screening special materials. This type of screening surface material is lightweight, corrosion-resistant, and relatively low-cost, suitable for screening lightweight and corrosive materials.
4、 Screen size and structure
Screen width and length: Screen width directly affects productivity, while screen length directly affects screening efficiency. Wide screening surface, increased area, and improved productivity; The sieve surface is long, the material stays on the sieve surface for a long time, there are many opportunities for sieving, and the screening efficiency is high. But the longer the screening surface length, the better, because the relationship between screening efficiency and the time the material spends on the entire screening surface is complex. Generally speaking, the width of the sieve surface should be at least 2.53 times the maximum material size, and the ratio of sieve length to width should be selected within the range of 23.
Sieve opening ratio: The sieve opening ratio refers to the ratio of the sieve opening area to the sieve surface area. A high porosity increases the probability of material particles passing through the sieve, and the processing capacity of the vibrating screen is high. On the contrary, the processing capacity of the vibrating screen is low. Therefore, in order to improve screening efficiency, a screen surface with a higher porosity should be selected.
5、 Other factors
Mesh tension: The tension of the mesh has a significant impact on screening efficiency. Insufficient tension can cause the sieve mesh to become loose, the sieve holes to become blocked, and the material layering effect to be poor; If the tension is too high, it may damage the sieve and shorten its service life. Therefore, it is crucial to control the tension of the screen mesh reasonably.
Screening purpose and processing capacity: Select the appropriate vibrating screen model and screen surface configuration based on the screening purpose (fine screening or coarse screening) and processing capacity requirements. Fine screening can choose rotary vibrating screen, ultrasonic vibrating screen, etc; Rough screening can use linear vibrating screens, mining vibrating screens, etc.
In summary, the selection of the screen surface for mining vibrating screens requires comprehensive consideration of multiple factors, including screen hole size and shape, screen mesh size and density, screen surface material, screen surface size and structure, as well as other factors such as screen tension, screening purpose and processing capacity. By selecting these factors reasonably, the screening efficiency and processing capacity of the vibrating screen can be ensured to meet production needs.
