The rotary vibrating screen is a high-precision fine powder screening machine produced by Xinxiang WITTMANN. It has low noise and high efficiency. It takes 3-5 minutes to quickly change the screen. It has a fully enclosed structure and is suitable for screening materials such as granules, powder and mucus. Sub-filtering. The rotary vibrating screen is made of a vertical motor as the excitation source. The upper and lower ends of the motor are equipped with eccentric weights to convert the motor's rotary motion into a horizontal, vertical, and inclined three-dimensional motion, and then transfer this motion to the screen surface . Adjusting the phase angle of the upper and lower ends can change the movement trajectory of the material on the screen surface.
Working principle of vibrating screen:
The process of dividing groups of broken materials with different particle sizes through a single-layer or multi-layer sieve surface with uniformly-distributed holes multiple times and dividing them into several different levels becomes sieving. The particles larger than the sieve opening remain on the sieve surface and are called the oversieve of the sieve surface. The particles smaller than the sieve opening pass through the sieve and are called the undersieve of the sieve surface. The actual screening process is: after a large number of broken materials with different particle sizes and mixed thicknesses enter the screen surface, only a part of the particles contact the screen surface. Due to the vibration of the screen box, the material layer on the screen is loosened, so that large particles exist. The gap is further enlarged, and small particles take the opportunity to pass through the gap and transfer to the lower layer or conveyor. Because the gap between small particles is small and large particles cannot pass through, the original disorderly arrangement of particles separates, that is, they are stratified according to particle size, forming an arrangement rule with small particles on the bottom and coarse particles on the top. The fine particles that reach the sieve surface can pass through the sieve of those smaller than the sieve hole, and finally realize the separation of coarse and fine particles and complete the screening process. However, there is no sufficient separation. During sieving, there is generally a part of the undersize material remaining on the oversize material. When fine particles pass through the sieve, although the particles are smaller than the sieve holes, they have different degrees of difficulty in passing through the sieve. The materials and the particles with similar sieve pore sizes are more difficult to penetrate through the sieve, and even more difficult to penetrate the particle gaps in the lower layer of the sieve surface.
Working characteristics of vibrating screen:
① Adopt block eccentricity as exciting force, which is strong.
② The screen beam and screen box adopt high-strength bolts, with simple structure and convenient and quick maintenance;
③Using tire coupling, flexible connection, stable operation;
④. The structure of small amplitude, high frequency and large inclination angle makes this machine high in screening efficiency, maximum processing, long life, low power consumption and low noise.
According to the structure and working principle of the screening machine, there are roughly the following categories:
1. The working surface of the roller screen is composed of rolling shafts arranged horizontally.
2. Roller screen The working surface is composed of rolling shafts arranged horizontally. Fixed screen The working part is fixed, and the material is screened by sliding along the working surface. Fixed grid sieve is a kind of more used in concentrators, generally used for pre-screening before coarse crushing or medium crushing. It has a simple structure and is convenient to manufacture. It does not consume power and can directly unload the ore onto the screen surface. The main disadvantages are low productivity and low screening efficiency, generally only 50-60%.
3. Plane motion screen The body is swinging or vibrating in a plane. According to its plane motion trajectory, it is divided into linear motion, circular motion, elliptical motion and complex motion. Shaking screens and vibrating screens fall into this category.
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