The characteristics of high frequency screen

The use of high frequency screen
High frequency screen is widely used to screen (including dry and wet type), grading and dewater materials in beneficiation, coal separation, chemicals, bricks, food, pharmaceutical, caustic soda, fertilizers, paper and other industries. In fine classification processes, screening efficiency can be up to 70% if give appropriate feeding concentration and feeding particle size (-200 mesh content), as well as the difference between sieve particle size and feeding particle size is less than 30 percent. High screening efficiency can significantly reduce the qualified gain content in cyclic loading and screenings thereby increasing the processing capacity of the mill (in general can increase 5% to 10%). It has a strict control on the particle size of materials under screen so that eliminate the adverse effects of too coarse mineral particles on concentrate grade; additionally, in the role of high-frequency small-amplitude oscillation of the screen surface, the high-density small particles are easy to settle on screen surface and significantly improve the taste of materials under the screen.
Performance characteristics of high frequency screen
1. It is a new structure and high efficiency vibration screening machinery with a new design principle, usually adopts nylon or stainless steel sieve.
2. Exciter drives screen surface can do high-frequency vibration by transmission or keep screen box static. Vibration system is designed to work in the near- resonance condition with a vibration damper bearing; complete machine generally gives no live load to the ground; screening machine can be directly mounted on a solid flat surface or in ordinary steel platform without making foundation.
3. Vibration frequency of sieve surface is 50Hz, amplitude is 0 to 2 mm, vibration intensity is 8 to 10 times of gravity acceleration, and 2 to 3 times of general mechanical vibrating screen. The screen surface is of high efficiency, large handling capacity and low pore blocking rate, especially suitable for screening fine powder material. Classification granularity is 0.074 ~ 1mm.
4. The screen surface is made from three different layers of flexible screens. The bottom steel wire core polyurethane mesh is a support network where laying double-layer composite stainless steel wires mesh of different wire diameters and meshes. The upper composite mesh is work network, which directly contacts with the material; the lower one is base network and used to disperse force and transmit vibration to ensure a high screening efficiency and extended service life.  Both ends of screen are with hooks to handle screen and adjust the tension easily. Feeding buffer sieve board disperses slurry evenly and avoids a direct impact on screen.
5. Screen installation angle is convenient adjustable, wet sieving installation angle is generally 25 ± 2 ° for concentrator. You can adjust the inclination angle depending on the desired mineral grain, when close to 55 °, the fineness can be 300 meshes and screening efficiency is up to about 75%.
6. Vibration parameters is adjusted the controlled by computer, the vibration parameters of each vibrator can be set and adjusted individually. The controller is with instantaneous strong vibration function which can clean the screen surface and avoid plugging hole at regular time.
7. The vibration transmission system is flexibly linked by high-quality elastic material, it can long-term reliably operates; screen machines is energy-saving. Single exciter power is of 0.15KW. The common type used for beneficiation is 2420-type electromagnetic high frequency screen, whose whole power consumption does not exceed 1.2KW /unit.
8. The side plate of the screen box is made from a whole bending steel plate, which not only enhance the overall stiffness and reliability, and make the device look better.
9. Screen machine can configure different types of control cabinet according to different needs of customers’ in order to achieve various additional features such as parameter settings, remote centralized control, history record and fault alarms.
 

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