As an important screening equipment, vibrating screen is now more and more widely used in various industries. For different industries, the vibrating screen has different model size, screening accuracy and output. For example, in the mining industry, the general vibrating screen equipment model is relatively large. How to improve the screening accuracy of the vibrating screen in the screening work of different materials, let’s take a look at it in detail.
Reasons for the low screening accuracy of vibrating screen
1. The mesh of the screen is blocked
Solution: increase the anti-clogging device; develop the habit of cleaning the screen of the vibrating screen frequently, and reduce the load of the vibrating screen.
2. The material has high moisture and viscosity
Solution: put it into the vibrating screen after proper drying; change the inclination of the screen box.
3. Uneven feeding on the screen surface of the vibrating screen
Solution: increase the material flow divider; adjust the feeding amount of the vibrating screen appropriately.
4. The material layer on the screen surface of the vibrating screen is too thick
Solution: increase the material flow divider to control the feeding amount; tighten the screen and tighten the transmission belt. Let’s talk about how to improve the screening accuracy of the vibrating screen.
Measures to improve the screening accuracy of vibrating screen
1. Adjust the vibration frequency
Adjust the vibration frequency of the vibrating screen. In the operation of the equipment, if you want to achieve higher screening accuracy, you can adjust the vibration frequency to achieve the purpose of improving the screening accuracy. The higher the vibration frequency of the vibrating screen, the faster the moving speed of the material on the screen surface, and the higher the jumping height of the material on the screen surface, which is more conducive to the penetration of small particle materials.
2. Using two vibrating screens
Two vibrating screens are used to screen the materials. At this time, one vibrating screen is used for primary screening, and the other is used for fine screening, which can effectively improve the screening accuracy. However, the screening accuracy can be guaranteed by this method, but the equipment capital investment is relatively large, and the processing capacity is relatively small. Usually, when the screening accuracy can meet the needs of users, it is generally considered to use a rotary vibrating screen and a vibrating screen for screening.
3. Extend the screening time
Extend the screening time of the vibrating screen. This type of screening method is mainly used when the material is difficult to screen. By prolonging the screening time of the material on the screen surface, the longer the movement time of the material on the screen surface, the smaller particles of material passing through the screen holes. The higher the probability, the better the screening accuracy of materials can be improved. However, some improvements need to be made to the vibrating screen at this time. The common method is to install a gate on the frame of the vibrating screen and the discharge port, so that if you want to improve the screening accuracy, you can close the gate to allow more material on the screen surface. Staying for a certain time can effectively improve the screening accuracy.
4. Reduce the amount of feed
We all know that if the vibrating screen wants to achieve better screening accuracy, it usually needs to feed uniformly. The main reason is that the feeding amount is too large and the material layer of the material is too thick, so that the material on the screen surface of the vibrating screen is prone to accumulation, which is not conducive to the material passing through the screen. Similarly, for the vibrating screen, a uniform feeding method is also adopted, so as to ensure that the material is adequately screened on the screen surface, which is conducive to improving the screening accuracy. A better way is to use a vibrating feeder and other equipment to evenly feed the material , to ensure the continuity and uniformity of the material flow.
5. Add a cleaning device
In the production process, a cleaning device is added to the vibrating screen. If the cleaning device is well selected or used correctly, the screening degree of the vibrating screen can be effectively improved. The bouncing ball is a common component of vibrating screen cleaning. The bouncing ball is generally used for materials with good fluidity or slightly blocking the net. The bouncing ball is affected by the vibration force of the vibrating screen and hits the net with the material to achieve the net cleaning effect. If this kind of cleaning device does not work well for special fine powder. Especially fine materials need to use ultrasonic device. The ultrasonic device is especially used for the screening of fine materials, and the application of ultrasonic waves to the vibrating screen can effectively improve the screening accuracy. The brush is generally used with two ultrasonic waves or bouncing balls for two-layer net cleaning.
6. Reduce the moisture content of materials
For materials that are difficult to screen, it is usually due to the fact that the material contains a large amount of water, or the material has a certain viscosity and other factors. These factors affect the screening accuracy and screening effect of the vibrating screen. If you want to achieve a better screening effect, take certain measures to dry the material before feeding, so that the material will not block the screen during the screening process. What we need to explain here is that the vibrating screen cannot be used for screening materials with a large water content.
Factors affecting the screening accuracy of vibrating screen
1. The size of the vibrating screen
The size of the vibrating screen is a factor that affects the screening accuracy. Different types of vibrating screens have different adaptability to the materials entering the screen, and the screening motions of materials on different types of vibrating screens are also different.
2. Feeding method
The factors affecting the screening accuracy are also the feeding method. The screening accuracy has a particularly important relationship with the quantitative feeding of the vibrating screen. The control of the feeding amount per unit time and the feeding amount during the running process of the vibrating screen is to determine the screening efficiency and screening. One of the important factors of accuracy. If the quantitative feeding cannot be controlled, the screening efficiency will generally be poor.
The above is the answer on how to improve the screening accuracy of the vibrating screen. First of all, we must clarify that the screening accuracy of the vibrating screen is not high because the screen mesh is blocked, the material moisture and viscosity are large, etc., and then take certain measures to improve the screening accuracy. For example, the vibration frequency of the vibrating screen is adjusted, and two vibrating screens are used to screen materials. In the actual production process, the vibrating screen can be adjusted appropriately according to the specific situation and production needs.